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					Southeast Alberta Transmission
        Development

Detailed Alternative Assessment and
         Recommendation




            June 6, 2007




         Draft for Discussion
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Executive Summary
This document provides the approach and plan to address the regional transmission
development requirements in southeastern Alberta. The regional plan identifies the facilities the
AESO is:

    1. seeking approval for immediate upgrades and additions; and
    2. providing (for information purposes) the work the AESO has undertaken regarding
       additional future requirements, decisions remaining to be made, and the process the
       AESO intends to follow to reach the decision of a recommended alternative.
The AESO assessed the regional transmission development required in southeast Alberta to
address the load growth in the region, identified coal and wind generation in the region and
restore the Alberta-Saskatchewan interconnection capacity to the original design levels.

Generation potential within southeast Alberta continues to increase, particularly wind generation
capacity identified to the AESO by developers. The impact of growing wind generation on the
reliability of the Alberta Transmission System has led the AESO to establish a province-wide
reliability threshold of 900 MW which will be effective until mitigation measures have been
identified and implemented. The AESO has subsequently developed a draft Market and
Operational Framework For Wind Integration In Alberta and continues to engage stakeholders as
a step towards the ultimate objective of determining and implementing rules and tools needed to
integrate as much wind into the Alberta system as feasible without compromising system
reliability or the fair, efficient and openly competitive operation of the market. Given the current
uncertainty regarding the implications of the Market and Operational Framework on the
development of wind generation, the AESO is pursuing a phased approach to regional
transmission reinforcement in the southeast Alberta.

    •    The first phase, or “Part A”, will address the forecast load growth of 162 MW from 2007-
         2017 and restoring the Alberta-Saskatchewan interconnection capability to its full path
         rating. This will also enable the interconnection of proposed southeast wind farms total in
         141 MW of installed capacity that are within the 900 MW threshold.
    •    The second phase, or “Part B”, includes the potential transmission development required
         to interconnect potential wind generation development beyond the threshold in southeast
         Alberta, subject to the requirements to be established in the Market and Operational
         Framework.

The detailed assessment has been conducted on both phases (Part A and Part B) to ensure the
transmission system reinforcement identified for Part A would be consistent with the later larger
build of Part B. In addition, the two leading Part B alternatives are expected to be heavily
influenced by local siting issues rather than technical differences between the alternatives.




                               Alberta Electric System Operator
Draft for Discussion                              i                                June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Therefore the AESO will:
    •    seek approval for Part A regional transmission development now;
    •    launch a parallel process to develop a concurrent need and facility application, as a new
         framework option identified in the Revised Transmission Regulation released in April
         2007.

This will:
    •    allow the AESO to address the requirements of Part A on a timely basis;
    •    allow work to proceed expeditiously on facility application for Part B; and
    •    enable the Part B regional transmission development Need process and recommendation
         to be made concurrently with the Facility process and recommendation, enabling the
         results of the detailed siting work to be considered in the selection of the Part B
         recommended alternative.


Part A Development
The analysis of the existing transmission system under a number of possible system operating
scenarios with respect to area load, generation and interchange with Medicine Hat and
Saskatchewan identified a number of largely independent constraints in each of the planning
areas in the Southeast. Table Exec-1 provides the transmission additions and upgrades that are
recommended to address the constraints.

The proposed Part A Development has an estimated cost of $123.1 million (±30%, 2009)1. A
breakdown of the proposed development and cost estimates within the Lethbridge, Brooks,
Empress and Vauxhall area is also provided in Table Exec-1.

AltaLink Management Ltd. advises that although the additions to the present Amoco Empress
163S site are technically and operationally achievable at the conceptual level, they provide future
challenges during construction, maintenance and contingencies. These concerns will continue to
be evaluated and could lead to the development of a new site in the vicinity of the existing site. It
is estimated that the development of the new site could add approximately $12 million to the
proposed development.

The anticipated in-service date for the facilities required in the Part A development is in the 2009
to 2010 time frame.




1
 The estimated cost represents the escalated cost, at 7.5 per cent per year, to reflect the cost at time the facilities
come into service based on a potential in-service date of 2009 (excluding AFUDC). Within the report cost estimates
are presented in constant 2007 dollars.

                                    Alberta Electric System Operator
Draft for Discussion                                       ii                                       June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table Exec - 1:            Part A development cost summary

     Description                                                                               Cost
                                                                                         (2009$, millions)2

     Lethbridge Area
     Rebuild (partial) of 734L/813L North Lethbridge 370S to MacDonald                            7.6
     146S to double-circuit
     North Lethbridge 370S 200 MVA 240/138 kV transformer addition                                9.7
     Brooks Area
     Replace two (2) 240/138 kV transformers at West Brooks 28S with two                         14.1
     (2) 400 MVA units
     West Brooks 28S to Brooks 121S 138 kV line addition & 100L                                  10.6
     reconfiguration
     27 MVAr Capacitor Bank addition at Tilley 498S                                               2.0
     Empress Area
     Salvage one 240/138 kV transformer at Amoco Empress 163S and add                            17.8
     2 (two) 400 MVA units
     869L Empress 394S termination and 760L reconfiguration                                       3.4
     951L Jenner 275S termination                                                                 6.5
     Add two (2) 27 MVAr Capacitor Banks at McNeill 840S                                          4.6
     Vauxhall Area
     New Hays 421S to Burdett 368S 138 kV line                                                   19.0
     Miscellaneous Upgrades
     Existing line rating upgrades requiring clearance corrections                               24.3
     Existing line rating upgrades requiring terminal modifications                               3.0
                                            Part A Development Estimated Cost                   $123.1




2
 The estimated cost represents the escalated cost, at 7.5 per cent per year, to reflect the cost at time the facilities
come into service based on a potential in-service date of 2009 (excluding AFUDC). Within the report cost estimates
are presented in constant 2007 dollars.

                                    Alberta Electric System Operator
Draft for Discussion                                       iii                                      June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Part B Development
The existing 138 kV system in southeast Alberta, which was historically designed to serve area
load, does not have adequate capacity to allow interconnection of the 922 MW of new wind
generation proposed in the region. The assessment of the existing transmission system indicated
that all major 138 kV lines in the region including 100L, 760L, 172L and 763L would be severely
overloaded under Category A and B conditions if the proposed wind generation in the region was
to be connected without transmission upgrades.

Due to the magnitude of proposed generation development, 240 kV is considered the
appropriate voltage level for the bulk of the new transmission development. Five alternatives
based on two types of 240 kV development alternatives were developed.

    1. The first type of alternatives involves establishing a 240 kV grid and transformation
       terminals that are dedicated for the interconnection of the various wind farms that would
       not be integrated with the load serving 138 kV system initially.
    2. The second type of alternatives involves a 240 kV development that is integrated with the
       load serving 138 kV system at selected locations. Alternatives of this type expose the
       underlying 138 kV lines to overloads under normal and contingency conditions due to
       parallel flows.
Two alternatives of the first type as described above, involving a dedicated 240 kV development
are selected for further consideration. This is largely due to the lower initial capital cost and the
existing 138 kV system along with the Part A developments, is adequate to support forecast load
within the 10 year planning horizon unless major changes in the system, such as substantial
increase in the City of Medicine Hat Demand Transmission Service (DTS), occur. In the longer
term, further reinforcement of the 138 kV system is likely to be required to support load growth.
At such time, the Part B 240 kV development, coupled with some reconfiguration of the 138 kV
network, will be utilized to provide additional load serving capability.

The preferred alternative envisages a 240 kV development sourced from West Brooks 28S
terminating at two new 240 kV wind generation collector stations; one in the vicinity of Fincastle
336S and another in the vicinity Bullshead 523S, to serve generation developments in the
respective area. Alternatives B-2 and B-3, which address the requirements of Part B, are
electrically similar. The difference between these two alternatives relates primarily to the siting of
the transmission line to the collector station in the Bullshead area as illustrated in Figure Exec-1.
The location of the transmission lines will be further analyzed in the parallel process of the Need
Application development and the AltaLink Facility Application process.




                              Alberta Electric System Operator
Draft for Discussion                             iv                                 June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure Exec - 1:                   Part B development




                                                                                           7L760/760L
                                                        795L
                                       763L
                   924L

                          923L




                                                               2L
                                                               72
                                               172AL
                                               (607L)
                 L
             725A




                                 66L
            863L




The following provides details of the transmission development anticipated for the second phase
(Part B):

Substation Developments

    •    A new wind farm collector transformation station at or near Fincastle 336S complete with
         a 240/320/400 MVA transformer;
    •    A new wind farm collector transformation station at or near Bullshead 523S complete with
         a 240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;




                                              Alberta Electric System Operator
Draft for Discussion                                            v                  June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Transmission Line Developments

    •    Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
         substation in an in-out arrangement, and
    •    Re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead 523S
         area substation in an in-out arrangement.

Alternative B-2
    •    A new double-circuit 240 kV line both sides strung, from West Brooks 28S to the Vauxhall
         158S area utilizing twin 795 kcmil conductors;
    •    A new double-circuit 240 kV line one side strung to extend one of the new circuits from
         West Brooks 28S to the new Fincastle 336S area 240 kV substation. The line will utilize
         twin 477 kcmil conductors;
    •    A new 240 kV line double-circuit one side strung, approximately 127 km, to extend the
         second circuit from West Brooks to the new Bullshead 523S area substation. The line will
         utilize twin 477 kcmil conductors;

Alternative B-3
    •    A new double-circuit 240 kV line both sides strung, from West Brooks 28S to the
         Fincastle 336S area 240 kV substation utilizing twin 795 kcmil conductors;
    •    A new 240 kV line double-circuit one side strung, to extend from the Fincastle 336S area
         240 kV substation to the Bullshead 523S area240 kV substation. The line will utilize twin
         477 kcmil conductors;

These developments have an estimated cost $245 to 272 million (±50%, 2010)3. The entire
amount is deemed a system cost by the AESO.

The anticipated in-service date for the facilities required in the Part B development, subject to the
Market and Operational Framework, is in the 2010 to 2012 time frame. The AESO will launch a
parallel process to preface a concurrent need and facility application, as per a new framework
option identified in the Revised Transmission Regulation released in April 2007, for the Part B
regional transmission development.




3
 The estimated cost represents the escalated cost, at 7.5 per cent per year, to reflect the cost at time the facilities
come into service based on a potential in-service date of 2010 (excluding AFUDC). Within the report cost estimates
are presented in constant 2007 dollars.

                                    Alberta Electric System Operator
Draft for Discussion                                       vi                                       June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table of Contents
EXECUTIVE SUMMARY ...........................................................................................................................................I

TABLE OF CONTENTS ......................................................................................................................................... VII

1.0                            INTRODUCTION................................................................................................................... 1
    1.1                        BACKGROUND............................................................................................................................ 1
    1.2                        OVERVIEW OF THE SOUTHEAST ALBERTA TRANSMISSION SYSTEM ............................................ 2
    1.3                        THE NEED FOR TRANSMISSION DEVELOPMENT IN SOUTHEAST ALBERTA .................................... 3
2.0                            EVALUATION OF ALTERNATIVES – PART A DEVELOPMENT ............................ 11
    2.1                        LETHBRIDGE AREA................................................................................................................... 11
       2.1.1                   Lethbridge area 138 kV line upgrade alternatives.................................................................. 11
       2.1.2                   North Lethbridge 370S substation upgrade alternatives......................................................... 15
    2.2                        BROOKS AREA .......................................................................................................................... 17
       2.2.1                   West Brooks 28S substation upgrade alternatives .................................................................. 17
       2.2.2                   New West Brooks 28S to Brooks 121S 138 kV line alternatives ............................................. 18
    2.3                        EMPRESS AREA ........................................................................................................................ 21
       2.3.1                   Amoco Empress 163S substation upgrade alternatives........................................................... 21
       2.3.2                   New Empress area 138 kV line upgrade ................................................................................. 21
       2.3.3                   Empress area voltage/reactive power support alternatives .................................................... 24
    2.4                        VAUXHALL & MEDICINE HAT AREAS ...................................................................................... 31
       2.4.1                   Vauxhall – Medicine Hat area 138 kV upgrades .................................................................... 31
       2.4.2                   Performance evaluation .......................................................................................................... 34
    2.5                        LINE CAPACITY UPGRADES....................................................................................................... 39
    2.6                        SHORT CIRCUIT ANALYSIS ........................................................................................................ 40
    2.7                        TRANSIENT STABILITY ANALYSIS ............................................................................................. 40
    2.8                        SUMMARY OF PROPOSED PART A DEVELOPMENT AND COST ESTIMATES .................................. 41
3.0                            EVALUATION OF ALTERNATIVES – PART B DEVELOPMENT ............................ 43
    3.1                        BASE CASE POINTS OF CONNECTION ......................................................................................... 43
    3.2                        ALTERNATIVE B-2A ................................................................................................................. 45
       3.2.1                   Description.............................................................................................................................. 45
       3.2.2                   Rationale for Alt-B-2a............................................................................................................. 46
    3.3                        ALTERNATIVE ALT-B-2B ......................................................................................................... 47
       3.3.1                   Description.............................................................................................................................. 47
       3.3.2                   Rationale for Alt-B-2b............................................................................................................. 47
    3.4                        ALTERNATIVE ALT-B-3A ......................................................................................................... 48
       3.4.1                   Description.............................................................................................................................. 48
       3.4.2                   Rationale for Alt-B-3a............................................................................................................. 49
    3.5                        ALTERNATIVE ALT-B-3B ......................................................................................................... 51
       3.5.1                   Description.............................................................................................................................. 51
       3.5.2                   Rationale for Alt-B-3b............................................................................................................. 51
    3.6                        ALTERNATIVE ALT-B-4 ........................................................................................................... 52
       3.6.1                   Description.............................................................................................................................. 52
       3.6.2                   Rationale for Alt-B-4............................................................................................................... 53
    3.7                        ALTERNATIVE ALT-B-5 ........................................................................................................... 55
       3.7.1                   Description.............................................................................................................................. 55
       3.7.2                   Rationale for Alt-B-5............................................................................................................... 56
    3.8                        ALTERNATIVE ALT-B-6 ........................................................................................................... 58
       3.8.1                   Description.............................................................................................................................. 58
       3.8.2                   Rationale for Alt-B-6............................................................................................................... 59
    3.9                        PERFORMANCE EVALUATION OF ALTERNATIVES ...................................................................... 60

                                                Alberta Electric System Operator
Draft for Discussion                                                            vii                                                         June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


      3.9.1            Study scenarios for power flow analysis ................................................................................. 60
      3.9.2            Results of power flow analysis ................................................................................................ 60
   3.10                COMPARISON OF PART B ALTERNATIVES ................................................................................. 62
      3.10.1           Comparison of technical performance .................................................................................... 62
      3.10.2           Financial comparison ............................................................................................................. 63
      3.10.3           Preliminary siting assessment................................................................................................. 65
   3.11                SUMMARY OF RECOMMENDED PART B DEVELOPMENT ............................................................ 67
4.0                    CONCLUSION...................................................................................................................... 71

APPENDIX A:            PROPOSED PART A DEVELOPMENT ......................................................................... A-1

APPENDIX B:            PART A - LETHBRIDGE AREA...................................................................................... B-1
   APPENDIX B-1:       ALTERNATIVE LETH 1-1 – 207L REBUILD .......................................................................... B-1-1
   APPENDIX B-1:       ALTERNATIVE LETH 1-2 – 734L/813L REBUILD ................................................................. B-2-1
APPENDIX C:            PART A - EMPRESS AREA.............................................................................................. C-1
   APPENDIX C-1:       ALTERNATIVE EMP 3-1 – 951L JENNER 275 TERMINATION ................................................ C-1-1
   APPENDIX C-2:       ALTERNATIVE EMP 3-2 – 951L JENNER 275 TERMINATION & 2 (TWO) 27 MVAR CAPACITOR
                       BANKS AT MCNEILL 840S .................................................................................................. C-2-1
   APPENDIX C-3:       ALTERNATIVE EMP 3-2 – 951L JENNER 275 TERMINATION, 1 (ONE) 50 MVAR SVC AT
                       EMPRESS 394S & 2 (TWO) 27 MVAR CAPACITOR BANKS AT MCNEILL 840S .................... C-3-1
APPENDIX D:            PART A – VAUXHALL-MEDICINE HAT AREAS ....................................................... D-1
   APPENDIX D-1:       ALTERNATIVE VM-1 – HAYS 421S TO BURDETT 368S 138 KV LINE .................................D-1-1
   APPENDIX D-2:       ALTERNATIVE VM-2 – HAYS 421S TO BULLSHEAD 523S 138 KV LINE .............................D-2-1
   APPENDIX D-3:       ALTERNATIVE VM-3 – HAYS 421S TO REDCLIFF (NEW) 138 KV LINE...............................D-3-1
APPENDIX E:            PART A – TRANSIENT STABILITY ANALYSIS ......................................................... E-1

APPENDIX F:            PART A – COST ESTIMATES..........................................................................................F-1

APPENDIX G:            PART B – RECOMMENDED DEVELOPMENT ........................................................... G-1

APPENDIX H:            PART B – ALTERNATIVE ANALYSIS.......................................................................... H-1
   APPENDIX H-1:       ALTERNATIVE B-2A ............................................................................................................H-1-1
   APPENDIX H-2:       ALTERNATIVE B-2B ............................................................................................................H-2-1
   APPENDIX H-3:       ALTERNATIVE B-3A ............................................................................................................H-3-1
   APPENDIX H-4:       ALTERNATIVE B-3B ............................................................................................................H-4-1
   APPENDIX H-5:       ALTERNATIVE B-4 ..............................................................................................................H-5-1
   APPENDIX H-6:       ALTERNATIVE B-5 ..............................................................................................................H-6-1
   APPENDIX H-7:       ALTERNATIVE B-6 ..............................................................................................................H-7-1
APPENDIX I:            PART B – COST ESTIMATES ...........................................................................................I-1




                                       Alberta Electric System Operator
Draft for Discussion                                                 viii                                                      June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


                                                       LIST OF TABLES

Table 1-1:        Line segment renumbering.............................................................................................. 2
Table 1-2:        Base case study scenarios .............................................................................................. 5
Table 1-3:        Sensitivity study scenarios.............................................................................................. 6
Table 1-4:        Summary of existing transmission system constraints ............................................... 7
Table 2-1:        Performance results for Lethbridge 138 kV line upgrade alternatives...................... 14
Table 2-2:        Comparison of Brooks area 138 kV line alternatives .................................................. 20
Table 2-3:        Summary of power flow study results for Empress area reactive power
                  support alternatives                                                                                                      26
Table 2-4:        Voltage stability results for Alt-Emp-3-1 ...................................................................... 28
Table 2-5:        Voltage stability results for Alt-Emp-3-2 ...................................................................... 29
Table 2-6:        Voltage stability results for Alt-Emp-3-3 ...................................................................... 30
Table 2-7:        Base case study scenarios ............................................................................................ 34
Table 2-8:        Sensitivity study scenarios............................................................................................ 35
Table 2-9:        Summary of sensitivity scenario results ...................................................................... 36
Table 2-10:       Comparison of Vauxhall-Medicine Hat area alternatives............................................ 38
Table 2-11:       Proposed line rating increases requiring clearance corrections .............................. 39
Table 2-12:       Proposed line rating increases requiring terminal modifications ............................. 40
Table 2-13:       Summary of Part A developments ................................................................................ 41
Table 3-1:        Base Case Points of Connection................................................................................... 44
Table 3-2:        Base case study scenarios ............................................................................................ 60
Table 3-3:        Summary of power flow study results for Part B alternatives ................................... 61
Table 3-4:        Technical comparison of Part B alternatives............................................................... 62
Table 3-5:        Cost of Part B alternatives ............................................................................................. 63
Table 3-6:        Comparative system losses........................................................................................... 63
Table 3-7:        Summary of financial evaluation results ...................................................................... 64


                                                      LIST OF FIGURES

Figure 1-1:       Existing southeast Alberta transmission system.......................................................... 3
Figure 2-1:       Lethbridge area 207L rebuild alternative...................................................................... 12
Figure 2-2:       Lethbridge area 734L/813L rebuild alternative ............................................................ 13
Figure 2-3:       Brooks area 138 kV line alternatives ............................................................................ 19
Figure 2-4:       Empress Area 138 kV line alternatives ......................................................................... 23
Figure 2-11:      Vauxhall/Medicine Hat area transmission line alternatives........................................ 33
Figure 3-1:       Part B transmission development: Alternative B-2 ..................................................... 45
Figure 3-2:       Part B transmission development: Alternative B-3 ..................................................... 48
Figure 3-3:       Part B transmission development: Alternative B-4 ..................................................... 52
Figure 3-4:       Part B transmission development: Alternative B-5 ..................................................... 55
Figure 3-5:       Part B Transmission Development: Alternative B-6.................................................... 58
Figure 3-6:       Part B development ........................................................................................................ 67




                                       Alberta Electric System Operator
Draft for Discussion                                                ix                                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




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                             Alberta Electric System Operator
Draft for Discussion                            x                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


1.0          Introduction
This document provides the approach and plan to address the regional transmission
development requirements in southeastern Alberta. The regional plan identifies the facilities the
AESO is:

    1. seeking approval for immediate upgrades and additions; and
    2. providing (for information purposes) the work the AESO has undertaken regarding
       additional future requirements, decisions remaining to be made, and the process the
       AESO intends to follow to reach the decision of a recommended alternative.
The AESO assessed the regional transmission development required in southeast Alberta to
address the load growth in the region, identified coal and wind generation in the region and
restore the Alberta-Saskatchewan interconnection capacity to the original design levels.

Generation potential within southeast Alberta continues to increase, particularly wind generation
capacity identified to the AESO by developers. The impact of growing wind generation on the
reliability of the Alberta Transmission System has led the AESO to establish a province-wide
reliability threshold of 900 MW which will be effective until mitigation measures have been
identified and implemented. The AESO has subsequently developed a draft Market and
Operational Framework For Wind Integration In Alberta and continues to engage stakeholders
as a step towards the ultimate objective of determining and implementing rules and tools
needed to integrate as much wind into the Alberta system as feasible without compromising
system reliability or the fair, efficient and openly competitive operation of the market. Given the
current uncertainty regarding the implications of the Market and Operational Framework on the
development of wind generation, the AESO is pursuing a phased approach to regional
transmission reinforcement in the southeast Alberta.

    •    The first phase, or “Part A”, will address the forecast load growth of 162 MW from 2007-
         2017, restoring the Alberta-Saskatchewan interconnection capability to its full path
         rating, and the interconnection of proposed southeast wind farms total in 141 MW of
         installed capacity that are within the 900 MW threshold.
    •    The second phase, or “Part B”, includes the potential transmission development required
         to interconnect potential wind generation development beyond the threshold in southeast
         Alberta, subject to the requirements to be established in the Market and Operational
         Framework.

1.1          Background
The southeast Alberta regional transmission development plan has been carried out in three
stages. In the first stage the need was identified and documented. The second stage consisted
of developing potential transmission alternatives to address the need and screening the
alternatives into a final set of transmission concepts. In this third and final stage, these concepts
were analyzed in detail to select the preferred development.

The wind interconnection threshold coming into effect required an adjustment in process that
resulted in the AESO producing a revision to the Need Assessment and Alternative Screening
documents originally produced in September 2005 and January 2006 respectively. In November
2006, the AESO engaged stakeholders on the phased approach and revisions in process which
has led to the Revised Need Assessment and Alternative Screening Document that was
finalized in March 2007. Based upon the alternatives identified in the alternative screening



                              Alberta Electric System Operator
Draft for Discussion                             1                                  June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


process, the detailed assessment of the two phases (Part A and Part B) undertaken by the
AESO is presented in this document. The recommended regional transmission development for
both phases (Part A and B) is presented below.

1.2          Overview of the southeast Alberta transmission system
Figure 1-1 provides an overview of the existing Southeast system including planned projects.

It is to be noted that a number of line segments in the southeast have been renamed in the
recent past. For the sake of consistency with the documents from the earlier phases of the
Southeast process the older line numbers are used throughout this document when referring to
those line segments. The line segments that have been renumbered are presented in Table 1-1.

Table 1-1:  Line segment renumbering
   Line Segment                                     New Line Number

    172L Taber 83S to Fincastle 336S                            610L
    172L Fincastle 336S to Burdett 368S                         612L
    172L Burdett 368S to Bullshead 523S                         879L
    172AL Conrad 135S to Fincastle 336S                         607L
    172L Bullshead 523S to Medicine Hat 41S                     880L
    100L Medicine Hat 41S to Suffield 895S                      892L
    7L224 Oyen 767S to Monitor 774S                             7L98




                             Alberta Electric System Operator
Draft for Discussion                            2                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 1-1:                  Existing southeast Alberta transmission system
                                                  To Anderson 801S &                                                                                                  To Oyen
                                               Sheerness Generating Station                                                                                            767S
                                                                       9L934/




                                                                                                                                                                                 7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                             Empress Liquids
                                                                                                                                                                   164S
                                                                         132S                                                                                          760AL
                                                                                                                              230S                                                             Amoco
                                            Bassano                                                                                                        Sandy Point   869                  Empress
                                             435S                   931L                                                                                                     L
                                                                                                                                                              204S                              163S
                                                                            Duchess                                             Jenner                                    760L
                                                                                                                                                               Empress
                                                                                                            951L                 275S
                                                                             339S                                                                                394S     871L
                                                                                                            944L                            945L
                          To Queenstown                                        Cutting Lake                                                                               Sand Hills 830L
                              504S                   853L                         227S                                                                                      341S
                                   935L                             814L
                                                                      827L Brooks                Tilley                                                                         McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                                               Convertor
                                                                                                                                                                             Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                          763AL                                795L                                  Suffield
                                       Enchant                                                                        895S                 Chappice Lake           760L
                                        447S                                                                                                   649S
                                                           763L




                                                                                                                                   100L
                                                                                                                                  (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                              Medicine Hat

                                                                               Vauxhall                                                          41S


                                                                                                                     172L
                                                                                                                                            172L (880L)
                                                                                                                                            Bullshead
                                                                                                                                                               Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)                    523S
                                                                                                                                            600L
                                                                                                                                                                 Hat
                                                         Taber                                                                                   Wind Farm
                                                                                                        2L




                                                          83S                                                                                    Project 513
      172L                           820L
                                                                                                      72




                                      Chin Chute                                        Taber Wind                                                 31 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      172AL
                                                                      (607L)




                      241S           Wind 30MW                                                                                                Peace Butte
      370S 207L         13L                                                               80MW              Westfield
                       8        Chin Chute IPP                                                                                                   404S
                111S    146S                                                                                 107S
     725L              823L         11MW
                      L




                       Lakeview
                  725A




   Lethbridge
                         593S                                           Conrad
                                            66L




      674S
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                   Note: Line numbers in barckets denote new line numbers
               863L




                                         To
                                       Stirling                                                                    138 kV
                                        67S                                                                                                        Thermal Plant
            To                                                                                                     240 kV
                                                                                                                                                   Wind Farm
          Magrath
           225S                                                                                                    Planned
                                                                                                                                                   Proposed Wind Farm
                                                                                                                   New
                   To
           Great Falls, Montana
             (merchant line)




1.3                The need for transmission development in southeast Alberta
There are three primary drivers for transmission development in the southeast. They are:

    1. Load growth - the regional load is forecast to grow by about 162 MW from 2007 to 2017;
    2. Generation development - a potential for 1972 MW of new generation comprised of nine
       (9) wind farms with a total installed capacity of 922 MW and a 1050 MW coal generating
       plant have been analyzed for the interconnection to the transmission system in the
       region; and
    3. The requirement to restore the capability of the Alberta-Saskatchewan interconnection to
       its full path rating of 150 MW in both directions.



                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                      3                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Given the current uncertainty regarding wind generation development due to operational
concerns, the AESO is pursuing a phased approach to transmission system reinforcement in
the Southeast. The first phase or “Part A” will be primarily based, in addition to load supply
adequacy and Alberta-Saskatchewan interconnection requirements, on the proposed southeast
wind generation that are within the existing 900 MW threshold. The second phase or “Part B”
will include all wind farms that are proposed in the southeast assuming the threshold will be
lifted to allow their interconnection.

The analysis of the existing transmission system was performed under a number of expected
future system operating scenarios with respect to area load, generation and interchange with
Medicine Hat and Saskatchewan. The base case and sensitivity study scenarios used to
analyze the need for transmission development in southeast Alberta were presented in the
Revised Need Assessment and Alternative Screening document dated March 28, 2007. The
base case scenarios and sensitivity study scenarios are reproduced in Table 1-2 and Table 1-3
respectively.




                             Alberta Electric System Operator
Draft for Discussion                            4                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 1-2:            Base case study scenarios




                                                                                                   Saskatchewan
                                                                   Medicine Hat
        Performance




                                                                   interchange




                                                                                                    interchange
                                       Study years




                                                                                     generation
                                                                                     SE Alberta




                                                                                                     Alberta to
                                                       Area load
                         Scenario
          System

           Tested




                                                                      City of




                                                                                       wind
                                                                        net
        PART A (900 MW wind generation threshold in effect, Bow City Project (1) not included)

      Load supply                                    summer
                          1         2008,2012                      26 MW load          zero          zero
       adequacy                                       peak

                                                      winter
                                      2008                         26 MW load          zero          zero
                                                      peak

        Impact of
                                                     summer        50 MW net      Maximum within
       generation         2         2008,2012                                                        zero
                                                     minimum       generation       threshold
        additions

                                                     summer                                        150 MW
                         3a         2008,2012                      26 MW load          zero
                                                      peak                                          export
     AB-SK Export
       capability
                                                     summer        50 MW net      Maximum within   150 MW
                         3b           2008
                                                     minimum       generation       threshold       export

                                                     summer                                        150 MW
                         4a         2008,2012                      26 MW load          zero
                                                      peak                                          import
     AB-SK Import
      capability
                                                     summer        50 MW net      Maximum within   150 MW
                         4b           2008
                                                     minimum       generation       threshold       import

     Maintenance                                     summer
                          5           2008                             zero            zero          zero
     Management                                      average

          PART B (900 MW wind generation threshold lifted, Bow City Project(1) not included)

                                                     summer        50 MW net       All proposed
                          6          2012                                                            zero
                                                     minimum       generation      Wind Farms
        Impact of
                                                     summer        50 MW net       All proposed    150 MW
       generation         7          2012
                                                     minimum       generation      Wind Farms       export
        additions
                                                     summer        50 MW net       All proposed    150 MW
                          8          2012
                                                     minimum       generation      Wind Farms       import
              (1) The impact of the Bow City project on the SE system will be assessed as a sensitivity scenario in the
              alternatives evaluation phase




                                            Alberta Electric System Operator
Draft for Discussion                                               5                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 1-3:         Sensitivity study scenarios




                                                                                                      Saskatchewan
                                                                      Medicine Hat
         Performance




                                                                      interchange




                                                                                                       interchange
                                    Study years




                                                                                     generation
                                                                                     SE Alberta




                                                                                                        Alberta to
                                                      Area load
                        Scenario
           System

            Tested




                                                                         City of




                                                                                       wind
                                                                           net
      Impact of Bow
                        1S         2012           summer peak         26 MW load       zero             zero
       City Addition

       Impact of
       increased
                        2S         2012           summer peak         90 MW load       zero             zero
      Medicine Hat
      net demand

         Impact of
       incremental                                 summer             50 MW net
                        3S         2012                                              226 MW             zero
      increase wind                                minimum            generation
         threshold



The analysis identified a number of thermal capacity, voltage as well as reliability related
constraints in each of the planning areas in southeast Alberta. A summary of the need
identification study results is provided in Table 1-4.




                                   Alberta Electric System Operator
Draft for Discussion                                              6                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 1-4:                     Summary of existing transmission system constraints

     Performance



                               Scenario



                                            Analysis
       System




                                            Year of
        Tested                                                                                   Issue




                                                                 PART A Transmission Development

                                                             •     overloading of 207L North Lethbridge 370S to Lethbridge 111S,
                                                                   734L North Lethbridge 370S to Lethbridge 241S and 813L
                                                                   Lethbridge 341S to Lethbridge 146S;

                                                             •     overloading of the North Lethbridge 370S 240/138 kV transformers
                                                                   T3 and T5;

                                                             •     overloading of out going 138 kV lines from West Brooks 28S
                                                                   including 814L and 827L to Brooks 121S and 763L to Vauxhall;

                                                             •     overloading of the West Brooks 28S 240/138 kV transformers T1
        Load supply adequacy




                                                                   and T2;
                                              2008 & 2012
                               Scenario 1




                                                             •     temporary loss of a large portion of Empress Area load, thermal
                                                                   overload of the underlying 138 kV network and voltage drop
                                                                   concerns following a fault on the Empress 163S 240/138 kV
                                                                   transformer;

                                                             •     thermal overloads and voltage drop concerns resulting from 760L
                                                                   Amoco Empress 163S to Empress 394S contingency. As well, the
                                                                   line gets overloaded under certain Category B contingencies;

                                                             •     overloading of 100L Brooks 121S to Medicine Hat 41S and 172L
                                                                   Fincastle 336S to Taber 83S;

                                                             •     overloading of 763L West Brooks 28S to Enchant Tap under
                                                                   winter peak conditions;

                                                             •     violation of voltage magnitude and stability criteria following single
                                                                   element outages.

                                                             •     overloading of 760L Amoco Empress 163S to Empress 394S;
                                              2012




                                                             •     overloading of 240/128 kV transformer at Amoco Empress 163S;
   accommodate




                                              2008&2012
    Capacity to




                               Scenario 2
    generation
       new




                                                                                                 None




                                                            Alberta Electric System Operator
Draft for Discussion                                                              7                                     June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




     Performance



                                                 Scenario



                                                                           Analysis
       System




                                                                           Year of
        Tested
                                                                                                                                    Issue




                                                                                            •    voltage magnitudes in the Empress Area below operating limits
                                                                                                 under Category A conditions;
          Alberta-Saskatchewan export capacity




                                                                                            •    overloading of the 240 kV transformer at Amoco Empress 163S
                                                                                                 under Category A conditions;
                                                 Scenario 3a & 3b (2008)




                                                                                            •    inability of the system to support full export following a number of
                                                                                                 Category B events involving the 240 kV lines supplying the
                                                                             2008 & 2012




                                                                                                 Empress Area due to very low transmission voltages;

                                                                                            •    overloading of 951L under category B conditions;

                                                                                            •    overloading of 172L Fincastle 336S to Burdett 368S and 760L
                                                                                                 Medicine Hat 41S to Chappice Lake 649S

                                                                                            •    overloading of 7L224 under Category B conditions;

                                                                                            •    increased overloading of 100L, 814L, 827L and 172L Taber 83S to
                                                                                                 Fincastle 336S under Category B conditions


                                                                                            •    thermal overloading of 945L Jenner 275S to Amoco Empress
                                                                             2012




                                                                                                 163S


                                                                                            •    thermal overloading of 760L Amoco Empress 163S to Chappice
     import capacity
      Saskatchewan




                                                                             2008 & 2012




                                                                                                 Lake 649S under Category B conditions;
                                                 Scenario 4
         Alberta-




                                                                                            •    thermal overloading of 931L Ware Junction 132S to West Brooks
                                                                                                 28S (only in 2008);


                                                                                            •    risk of loss of supply to Amoco Empress 163S, Jenner 275S and
          Maintenance outage management




                                                                                                 Wardlow 204S load during a maintenance-trip condition involving
                                                                                                 951L and either of 944L or 945L;

                                                                                            •    risk of curtailment of Sheerness generation during a maintenance-
                                                                                                 trip condition involving the 240 kV lines going south out of
                                                 Scenario 5




                                                                                                 Anderson 801S;
                                                                             2008




                                                                                            •    overloading of 760L Amoco Empress 163S to Medicine Hat during
                                                                                                 a maintenance-trip condition involving 933L Anderson to West
                                                                                                 Brooks and 931L Ware Junction to West Brooks;

                                                                                            Note: These constraints will be addressed through operational measures. As a result,
                                                                                            transmission development is not proposed to specifically address these constraints.
                                                                                            Refer to Section 4.4 of the Revised Need Assessment and Alternative Screening.




                                                                                           Alberta Electric System Operator
Draft for Discussion                                                                                              8                                            June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




     Performance



                                    Scenario



                                                 Analysis
       System




                                                 Year of
        Tested
                                                                                               Issue




                                                                 PART B Transmission Development

                                                             •     excessive overloading of major 138 kV transmission lines in the
      Capacity to accommodate new




                                                                   area under Category A conditions including:

                                                                   •   100L Medicine Hat 41S to Brooks 121S
                                    Scenario 6
                generation




                                                                   •   172L Medicine Hat 41S to Coaldale 254S
                                                   2012




                                                                   •   760L Medicine Hat 41S to Amoco Empress 163S

                                                                   •   763L Taber 83S to Vauxhall 158S

                                                             Category B analysis was not performed because the Category A
                                                             conditions do not represent valid operational state of the system




                                                            Alberta Electric System Operator
Draft for Discussion                                                             9                                   June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            10                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.0          Evaluation of alternatives – Part A development
Due to the largely localized nature of the constraints identified in the first phase or Part A, the
alternatives developed to address each constraint are also localized in nature and impact.
Consequently the developments considered in Part A consist of several, largely independent
sets of transmission addition and upgrade alternatives.

As a result, a regional approach is used in the evaluation of the majority of the alternative
developments under consideration for the Part A development. Accordingly, the analysis
performed as part of the evaluation of the alternatives for each area will be limited in scope to
what is appropriate to make a comparison between the competing alternatives. For example,
when evaluating the performance of the Lethbridge area 138 kV line upgrade alternatives, the
analysis performed focuses on the Lethbridge area issues which the alternatives were identified
to address. Consequently, the analysis does not include the other developments being
considered for the southeast. A similar approach will be used for the Brooks and Empress Area
developments.

A different approach is used in the evaluation of the Vauxhall - Medicine Hat area alternatives.
As part of the analysis for this area a comprehensive system performance analysis is performed
for the Southeast. Accordingly, the performance analysis for each Vauxhall-Medicine Hat area
alternative includes all of recommended developments for other regions within the Southeast.
As such, the analysis performed for this area not only provides a comparative assessment of
the performance of the alternatives for the area but also an assessment of the performance of
the southeast system as a whole with all of the potential Part A developments in place.

The AESO engaged AltaLink and the City of Lethbridge to perform preliminary siting
assessments for the Part A transmission developments being considered for the Southeast.
The Assessment included flying the project sites in a helicopter and analysis of aerial
photography within the study area. The TFO assessments for the transmission line and station
development in the study area are presented below.

2.1          Lethbridge area
2.1.1        Lethbridge area 138 kV line upgrade alternatives
Two alternatives involving upgrades to the Lethbridge area 138 kV supply system have been
identified to address overloading issues on 207L North Lethbridge 370S to Coalbanks 111S,
734L North Lethbridge 370S to Uplands 241S, and 813L Uplands 241S to MacDonald 146S.

2.1.1.1      Description of alternatives
i)           Alt-Leth-1-1: 207L rebuild
Alt-Leth-1-1 involves the rebuild of 207L North Lethbridge 370S to Coalbanks 111S to 138kV
double circuit along the existing line right-of-way (a distance of approximately 5.2 km) as shown
in the Figure 2-1. The cost of this alternative including associated substation upgrades is $7.6
million (± 30%, 2007$).




                             Alberta Electric System Operator
Draft for Discussion                            11                                June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 2-1:       Lethbridge area 207L rebuild alternative

                                                                       Uplands
                                                                        241S
                                              North Lethbridge
                                                   370S
  172L to Ft. Macleod                                       734L       813L
                                      172L
                                                                               Macdonald
                                                        207L                     146S
                  New

                                                  Coalbanks 111S
                                                                              823L

                        Bowron                 725L
                         674S
                                                                               Lakeview
                                                                                 593S
                       725L
                                                         824L



ii)           Alt-Leth-1-2: 734L/813L rebuild
Alt-Leth-1-2 involves the rebuild of a portion of 734L North Lethbridge 370S to Uplands 241S
and 813L Uplands 241S to Macdonald 146S to 138 kV double-circuit along the existing lines’
right-of-way (a distance of approximately 6.1 km) as shown in the Figure 2-2. The cost of this
alternative including associated substation upgrades is $6.6 million (± 30%, 2007$).




                                 Alberta Electric System Operator
Draft for Discussion                               12                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 2-2:       Lethbridge area 734L/813L rebuild alternative

                                                                      Uplands
                                                                       241S
                                              North Lethbridge
                                                   370S
  172L to Ft. Macleod                                       734L     813L
                                       172L
                                                                             Macdonald
                                                       207L                    146S
                       New
                                                 Coalbanks 111S
                                                                            823L

                         Bowron               725L
                          674S
                                                                             Lakeview
                                                                               593S
                        725L
                                                        824L




2.1.1.2      Power flow analysis
The performance of the system with each of the Lethbridge Area 138 kV line upgrades in place
and selected elements removed from service was analyzed for the forecast 2012 summer peak
period (Scenario 1). Table 2-1 provides a list of the contingencies studied and a brief description
of the resulting system performance; drawings showing detailed study results are included in
Appendix B.




                                  Alberta Electric System Operator
Draft for Discussion                             13                                June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 2-1:             Performance results for Lethbridge 138 kV line upgrade alternatives

                                                                                           Percentage Loading




                                                                                                                                                                                      Other System Performance
                                             370S to Uplands 241S




                                                                                             823L Macdonald 146S




                                                                                                                   824L Macdonald 593S
                                                                    813L Uplands 241S to




                                                                                                                                         725L Coalbanks 111S
  Figure No.




                                                                                                                                                                                              Concerns
                                             734L N. Lethbridge




                                                                                                                                                                 207L N. Lethbridge
                                                                                                                                                                 370S to Coalbanks
                                                                                                                   to Riverbend 618S
                                                                                             to Lakeview 593S
                                                                    Macdonald 146S




                                                                                                                                         to Bowron 674S/
                        Outage




                                                                                                                                         Riverbed 618S




                                                                                                                                                                 111S
Leth-1-1 – 207L Rebuild
C-1            All Elements in Service       64%                    43%                     15%                    7%                    31%                     24%                  none
C-2            734L N. Lethbridge 370S to    --                     22%                     42%                    65%                   84%                     41%                  none
               Uplands 241S
C-3            813L Uplands 241S to          21%                    --                      23%                    47%                   65%                     35%                  none
               Macdonald 146S
C-4            823L Macdonald 146S to        47%                    26%                     --                     23%                   45%                     28%                  none
               Lakeview 593S
C-5            824L Macdonald 593S to        73%                    52%                     23%                    --                    24%                     22%                  none
               Riverbend 618S
C-6            725L Coalbanks 111S to        72%                    51%                     22%                    2%                    --                      14%                  none
               Bowron 674S/ Riverbed
               618S
C-7            207L N. Lethbridge 370S to    69%                    48%                     19%                    4%                    26%                     --                   none
               Coalbanks 111S
C-8            New N. Lethbridge 370S to     69%                    48%                     19%                    4%                    26%                     45%                  none
               Coalbanks 111S line
Leth-1-2 - 734L/813L Rebuild
C-9            All Elements in Service       38%                    17%                     31%                    7%                    16%                     57%                  none
C-10           734L N. Lethbridge 370S to    --                     21%                     25%                    3%                    21%                     61%                  none
               Uplands 241S
C-11           813L Uplands 241S to          21%                    --                      27%                    5%                    18%                     59%                  none
               Macdonald 146S
C-12           823L Macdonald 146S to        24%                    3.9%                    --                     23%                   42%                     82%                  none
               Lakeview 593S
C-13           824L Macdonald 593S to        35%                    14%                     23%                    --                    22%                     63%                  none
               Riverbend 618S
C-14           725L Coalbanks 111S to        35%                    14%                     23%                    2%                    --                      41%                  none
               Bowron 674S/ Riverbed
               618S
C-15           207L N. Lethbridge 370S to    60%                    39%                     78%                    55%                   78%                     --                   none
               Coalbanks 111S
C-16           New Lethbridge 370S to        71%                    51%                     22%                    2%                    23%                     64%                  none
               Macdonald 146S




                                         Alberta Electric System Operator
Draft for Discussion                                                             14                                                                            June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.1.1.3       Preliminary siting assessment
Alternative Leth-1-2 would involve the rebuilding of the 138 kV lines 734L and 813L with a
double-circuit 138 kV line along the existing right of way and along roadways in the northeast
area of the City of Lethbridge. Alternative Leth-1-1 would involve the rebuilding of the single-
circuit 138 kV line 207L on the west side of the City of Lethbridge with a 138 kV double-circuit
line. The City of Lethbridge has indicated that the siting for Alternative Leth-1-1 would be in a
potentially environmentally sensitive area.

2.1.1.4       Comparison and recommendation
Alternatives Alt Leth-1-1 (207L rebuild) and Alt Leth-1-2 (734L/813L rebuild) are comparable in
addressing the constraints identified in the Lethbridge 138 kV system. However, Alt Leth-1-2 is
considered the preferred development over Alt Leth-1-1 for the following reasons:

      •   The cost of Alt Leth-1-2 is less than that of Alt Leth-1-1 by approximately $1.0 million (±
          30%, 2007$)
      •   Alt Leth-1-2 appears that it may involve less siting related constraints as the route for the
          double-circuit line would be along roadways and right-of-ways where as the route of the
          double-circuit line in Alt Leth-1-1 is in an area considered environmentally sensitive by
          the City of Lethbridge.
      •   The City of Lethbridge advises that the segments of 734L and 813L being considered for
          rebuild in Alt Leth-1-2 are reaching the maximum expected life. As a result, Alt Leth-1-2
          avoids the additional cost of rebuilding the lines for maintenance reasons.

Based on the above considerations, alternative Leth-1-2 is selected as the preferred
development.

2.1.2         North Lethbridge 370S substation upgrade alternatives
Two alternatives have been identified to address overloading issues regarding the existing 200
MVA, 240/138 kV autotransformers at North Lethbridge 370S.

2.1.2.1       Description of alternatives
iii)          Alt-Leth-2-1: North Lethbridge 370S transformers replacement
Alt-Leth-2-1 involves replacing the two existing 200 MVA autotransformers with 400 MVA units.
In addition, a circuit breaker will be added on the low side of each of the transformers to prevent
loss of load and transmission lines as a result of a fault on a transformer. The cost of this
alternative including associated substation upgrades is $13.5 million (± 30%, 2007$).

iv)           Alt-Leth-2-1: North Lethbridge 370S transformer addition
Alt-Leth-2-2 involves the addition of a third 200 MVA autotransformer to increase the substation
capacity. In addition, a circuit breaker will be added on the low side of each of the transformers
to prevent loss of load and transmission lines as a result of a fault on a transformer. The cost of
this alternative including associated substation upgrades is $8.4 million (± 30%, 2007$).

2.1.2.2       Preliminary siting assessment
The preliminary siting assessment indicates that existing substation sites can be developed to
accommodate the proposed developments.




                                Alberta Electric System Operator
Draft for Discussion                               15                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.1.2.3      Comparison and recommendation
Both Alt-Leth-2-1 and Alt-Leth-2-2 increase the firm capacity of the North Lethbridge 370S
substation to 400 MVA. However, the cost of Alt-Leth-2-2 is lower than that of Alt Leth-2-1 by
approximately 5.1 million (± 30%, 2007$). For this reason, Alt-Leth-2-2 is selected as the
preferred development.




                             Alberta Electric System Operator
Draft for Discussion                            16                                June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.2           Brooks area
2.2.1         West Brooks 28S substation upgrade alternatives
Two alternatives have been identified to address overloading of the 200 MVA, 240/138 kV
autotransformers at West Brooks 28S during an outage of one unit.

2.2.1.1       Description of alternatives
i)            Alt-Brks-1-1: West Brooks 28S transformers replacement
Alt-Brks-1-1 involves replacing the two existing 200 MVA autotransformers with 400 MVA units.
The cost of this alternative including associated substation upgrades is $12.2 million (± 30%,
2007$).

ii)           Alt-Brks-1-2: West Brooks 28S transformers addition
This alternative involves adding a third 200 MVA autotransformer to increase the substation
capacity. The cost of this alternative including associated substation upgrades is $12.1 million (±
30%, 2007$).

2.2.1.2       Preliminary siting assessment
The preliminary siting assessment indicates that existing substation sites can be developed to
accommodate the proposed developments.

2.2.1.3       Comparison and recommendation
Both Alt-Brks-1-1 and Alt-Brks-1-2 increase the firm capacity of the West Brooks 28S substation
to 400 MVA. The cost of the two alternatives is also similar. Alt-Brks-1-1 is selected as the
preferred development based on the following considerations.

      •   Addition of a third transformer at the station as considered in Alt-Brks-1-2 increases the
          cost of further 138 and 240 kV development at the substation. The cost of Alternatives
          Brks-2-1, Brks-2-2 and Brks-2-3, presented in Section 2.2.2 New West Brooks 28S to
          Brooks 121S 138 kV line alternatives, in particular will increase by approximately $0.7
          million, $1.0 million and $0.7 million (± 30%, 2007$), respectively.
      •   One of the transformers salvaged from this site is proposed to be reused at North
          Lethbridge 370S to reduce the capital cost of the North Lethbridge 370S upgrade. The
          other transformer can be reused elsewhere in the system or can be stored as a standby
          unit.
      •   Addition of a third transformer at the station as considered in Alt-Brks-1-2 takes up
          available space and infrastructure at the substation that could be utilized for future
          development at the substation such as addition of 240 kV lines out of the substation that
          is being contemplated in the Part B analysis presented in Section 3.0.
      •   Alt-Brks-1-2 requires expansion of the substation. As the existing fence is already inside
          new highway set back of 115m, it may be difficult to get approval from Alberta
          Transportation to expand the substation.

The performance of the southeast system with the proposed development in place is performed
in Section 3.4.

Replacement of the transformers will take approximately 15 days. Given the existing high load
in the region, the outage will be an issue while replacing the first 200 MVA 240/138 kV



                                Alberta Electric System Operator
Draft for Discussion                               17                                June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


transformer. One or more of the following measures will be considered to mitigate possible
overloading of the transformer remaining in service:

       •   perform the replacement during light load periods and in the period November to April to
           make use of the higher transmission line winter ratings,
       •   arrange to have one or more area generators dispatched including Medicine Hat, Maxim,
           Cavalier and Carseland for the duration of the outage,
       •   coordinate the outage with turnaround of a Sheerness Unit or dispatch down Sheerness
           when overloading occurs,
       •   segment the 138 kV system supplied by the West Brooks 28S substation during the
           outage by opening up existing 138 kV lines such as 853L West Brooks 28S to Queens
           Town 504S, 100L Brooks 121S to Medicine Hat 41S and 763L Vauxhall 158S to Taber
           83S,
       •   calculate the loss of transformer life based on the expected overloads and determine
           whether the loss is acceptable.

If the above measures are not feasible, a temporary transformer will be installed for the duration
of the outage.

2.2.2          New West Brooks 28S to Brooks 121S 138 kV line alternatives
Two alternatives have been identified in the Southeast Alberta Alternative Screening Document
to address the potential overloading of the two 138 kV West Brooks 28S to Brooks 121S lines
814L and 827L. Subsequently, a modified version of one of the alternatives has been added as
a third alternative. Following is a description of the alternatives.

2.2.2.1        Description of alternatives
i)             Alt-Brks-2-1: New West Brooks 28S to Brooks 121S 138 kV line
This alternative involves construction of a single-circuit 138 kV line from West Brooks 28S to
Brooks 121S as shown in Figure 3.2-1 below. The cost of this alternative including associated
substation upgrades is $10.0 million (± 30%, 2007$) and $10.7 million (± 30%, 2007$)
respectively depending on whether alternative Brks 1-1 or Brks-1-2 proceeds.

ii)            Alt-Brks-2-2: 831L re-termination at West Brooks 28S
Alt-Brks-2-2 involves construction of a double-circuit 138 kV line from West Brooks 28S to 831L
Brooks to Duchess to re-terminate 831L at West Brooks 28S in an ‘in-out’ arrangement as
shown in Figure 3.2-1 below. The cost of this alternative including associated substation
upgrades is $10.9 million (± 30%, 2007$) and $11.9 million (± 30%, 2007$) respectively
depending on whether alternative Brks 1-1 or Brks-1-2 proceeds.

iii)           Alt-Brks-2-3: New West Brooks 28S to Brooks 121S 138 kV line and 100L
               reconfiguration
This alternative involves construction of a single-circuit 138 kV line from West Brooks 28S to
Brooks 121S on a new right of way as shown in Figure 2-3. In this alternative 100L termination
at Brooks 121S will be removed and the line will be tied to the new line outside Brooks 121S to
establish a direct line from West Brooks 28S to Tilley 498S. The cost of this alternative including
associated substation upgrades is $8.9 million (± 30%, 2007$) and $9.6 million (± 30%, 2007$)
respectively depending on whether alternative Brks 1-1 or Brks-1-2 proceeds.



                                 Alberta Electric System Operator
Draft for Discussion                                18                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 2-3:        Brooks area 138 kV line alternatives
               Alt-Brks-2-1                                                 Alt-Brks-2-2

           Duchess 339S                                                  Duchess 339S




                                                       New


                   831L                                                            831L
                                      Cutting Lake 227S                                             Cutting Lake 227S




                                       Brooks 121S                                               Brooks 121S
                                                                                814L
                       827L                                                         827L
                                              100L           West brooks 28S                               100L
 West brooks 28S
                       814L    895L                                                          895L
                                              To Tilley 498S                                            To Tilley 498S
                              To Hays 421S                                                 To Hays 421S



                                          Duchess 339S



                                                                                    New


                                                  831L

                              Alt-Brks-2-3                          Cutting Lake 227S




                                                                     Brooks 121S
                                                814L
                                                     827L                                 100L
                              West brooks 28S
                                                             895L
                                                                            To Tilley 498S




2.2.2.2      Preliminary siting assessment
A 138 kV line from West Brooks to Brooks would be approximately 9 kilometers in length.
AltaLink anticipates that extensive consultation, helicopter trip, wild life survey, landowner and
agencies mitigation will be required to resolve siting issues.




                                        Alberta Electric System Operator
Draft for Discussion                                            19                                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.2.2.3      Comparison and recommendation
Both Alt-Brks-2-1 and Alt-Brks-2-2 create a third 138 kV path between the currently constrained
West Brooks 28S and Brooks 121S path. In addition, Alt-Brks-2-2 re-terminates 831L, the line
that currently feeds Cutting Lake 227S and Duchess 339S from Brooks 121S, at West Brooks
28S and thereby takes the load of these stations off the West Brooks 28S to Brooks 121S path .
Alt-Brks-2-3 takes the load of 100L to Tilley 498S off the path. All three alternatives adequately
relieve the constraint for the foreseeable future. The high level assessment of siting identified
similar land use for the 3 alternatives with minor potential differences in the study area.

Table 2-2 compares the pros and cons of the three alternatives.

Table 2-2:        Comparison of Brooks area 138 kV line alternatives
              Alt-Brks-2-1                  Alt-Brks-2-2                  Alt-Brks-2-3

    Cost is $0.9 million lower      Cost is $0.9 million and        Cost is $1.1 million and
    than that of Alt-Brks-2-2       $2.0 million higher than that   $2.0 million lower than
    and $1.1 million higher than    of Alt-Brks-2-1 and Alt-        that of Alt-Brks-2-1 and
    that of Alt-Brks-2-3            Brks-2-3, respectively          Alt-Brks-2-2, respectively

    Does not take Cutting Lake      Takes Cutting Lake 227S         Does not take Cutting
    227S and Duchess 339S           and Duchess 339S Load off       Lake 227S and Duchess
    Load off the West Brooks        the West Brooks 28S to          339S Load off the West
    28S to Brooks 121S path         Brooks 121S path                Brooks 28S to Brooks
                                                                    121S path

    The new West Brooks 28S         The existing segment of         The new West Brooks
    to Brooks 121S line will        831L which has a                28S to Brooks 121S line
    have a summer/winter            summer/winter rating of         will have a summer/winter
    rating of approximately         98/114 MVA will become a        rating of approximately
    177/212 MVA similar to          part of the new West            177/212 MVA similar to
    814L and 827L, the existing     Brooks 28S to Brooks 121S       814L and 827L, the
    lines between the two           line and as a result will       existing lines between the
    stations                        constrain the capacity of       two stations
                                    the line and the path

    Will not allow breaker          Allows breaker                  Will not allow breaker
    maintenance without de-         maintenance without de-         maintenance without de-
    energizing supply to Cutting    energizing supply to Cutting    energizing supply to
    Lake 227S and Duchess           Lake 227S and Duchess           Cutting Lake 227S and
    339S(1)                         339S                            Duchess 339S(1)

Note:    (1) This meets the AESO’s minimum standard of service
Alt-Brks-2-3 is selected as the preferred development as it satisfies the requirements at the
lowest cost.




                               Alberta Electric System Operator
Draft for Discussion                             20                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.3          Empress area
2.3.1        Amoco Empress 163S substation upgrade alternatives
In the Revised Need Assessment and Alternative Screening document two alternatives were
considered. Alt-Emp-1-1 considered increasing the firm 240/138 kV transformer capacity at
Amoco Empress 163S to 200 MVA by installing a second 200 MVA, 240/138 kV
autotransformer; however under Category B conditions during heavy export to Saskatchewan
one transformer would be loaded to 125 per cent. With this, Alt-Emp-1-1 does not satisfy the
AESO Reliability Criteria, it was screened out from further consideration and not considered in
the detailed assessment.

The following alternative, designated Alt-Emp-1-2 in the Revised Need Assessment and
Alternative Screening, is identified to address the severe impacts of the Amoco Empress 163S
240/138 kV transformer contingency and its overloading under Category A & B conditions.

This alternative involves replacing the existing 200 MVA, 240/138 kV transformer with a 400
MVA unit and adding a second 400 MVA, 240/138 kV transformer to increase the substation
capacity and to improve contingency performance. The cost of this alternative including
associated substation upgrades is $15.4 million (± 30%, 2007$).

2.3.1.1      Preliminary siting assessment
The preliminary siting assessment indicates that existing substation sites can be developed to
accommodate the proposed developments. However, AltaLink advises that although the
additions to the present Amoco Empress 163S site are technically and operationally achievable
at the conceptual level, they provide future challenges during construction, maintenance and
contingencies.

These concerns would be further evaluated in the design stage and could lead to the
development of a new site in the vicinity of the existing site. It is estimated that the development
of the new site could add approximately $12 million to the proposed development.

2.3.1.2      Comparison and recommendation
Alt-Emp-1-2 increases the firm capacity of the Amoco Empress 163S substation to 400 MVA. As
there is no comparable alternative, this development will be included in the final development
plan for the Southeast.

2.3.2        New Empress area 138 kV line upgrade
Three alternatives have been identified in the Southeast Alberta Alternative Screening
Document to mitigate the impact of a 760L Amoco Empress 163S to Empress 394S
contingency and its overloading under various system conditions. Subsequently, a modified
version of one of the alternatives has been added as a fourth alternative. Following is a
description of the alternatives.

2.3.2.1      Description of alternatives
i)           Alt-Emp-2-1: New Sandhills 341S to Empress 394S 138 kV line
Alt-Emp-2-1 involves construction of a 138 kV line (approximately 0.63 km) from Empress 394S
tapping into 871L at or near Sandhills 341S substation as shown in Figure 2-4. The cost of this
alternative including associated substation upgrades is $4.1 million (± 30%, 2007$).




                              Alberta Electric System Operator
Draft for Discussion                             21                                 June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


ii)            Alt-Emp-2-2: Sandy Point 204S to Empress 394S 138 kV line
Alt-Emp-2-2 involves construction of a 138 kV line (approximately 0.7 km) from Empress 394S
tapping into 869L at or near Sandy Point 204S substation as shown in Figure 2-4. The cost of
this alternative including associated substation upgrades is $3.5 million (± 30%, 2007$).

iii)           Alt-Emp-2-3: 869L re-termination at Empress 394S
Alt-Emp-2-3 involves construction of a double-circuit 138 kV line (approximately 0.7 km) from
Empress 394S to 869L Amoco Empress 163S to Sandy Point 204S to re-terminate 869L at
Empress 394S in an in-out arrangement as shown in the Figure 2-4. The cost of this alternative
including associated substation upgrades is $4.4 million (± 30%, 2007$).

iv)            Alt-Emp-2-4: 869L/760L re-configuration
Alt-Emp-2-4 involves construction of a double-circuit 138 kV line (approximately 0.7 km) from
Empress 394S to 869L Amoco Empress 163S to Sandy Point 204S to re-terminate 869L at
Empress 394S in an in-out arrangement. 760L will be rearranged so as to bypass Empress
394S and the new circuits from 869L will be terminated at Empress 394S on the terminal bays
vacated by 760L. In this arrangement Empress 394S will be supplied radially over a 700m line
from Amoco Empress 163S. Due to the very short length of the line no significant reduction in
reliability of supply is expected.

This alternative is shown in the Figure 2-4. The cost of this alternative including associated
substation upgrades is $2.9 million (± 30%, 2007$).




                                 Alberta Electric System Operator
Draft for Discussion                                22                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 2-4:       Empress Area 138 kV line alternatives

                           Sandy Point 204S
                                                  869L


       Alt-Emp-2-2                                            Amoco Empress
                                                              163S

                                                    760L

           Alt-Emp-2-3                                      871L                New




                       Empress 394S
                                                                    Sandhills
                                                                    341S

                            760L             Alt-Emp-2-1




                                      869L                   Amoco Empress
                                                             163S

                                                   760L

          Alt-Emp-2-4                                      871L                 New



                       Empress 394S
                                                                   Sandhills
                                                                   341S

                            760L


2.3.2.2      Preliminary siting assessment
A 138 kV line from Amoco Empress 163S to Empress 394S would be located in the Empress
industrial area and is approximately 700m long. Previous environmental surveys have shown
that Burrowing Owl habitats may exist in the Empress region. The presence of these owls could
prevent the substation development or at least limit construction to winter months when the
Owls are not in the area.




                                   Alberta Electric System Operator
Draft for Discussion                                 23                               June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Given the close proximity of the Empress 394S expansion to the Encana pipeline, pipeline
mitigation may be required.

2.3.2.3       Comparison and recommendation
All of the four alternatives address the overloading and impact of an outage of 760L Amoco
Empress 163S to Empress 394S. The high level assessment of siting identified similar land use
for the four alternatives with minor potential differences in the study area. Alt Emp 2-4 is
selected for further consideration as it is the alternative with the lowest cost.

2.3.3         Empress area voltage/reactive power support alternatives
Three alternatives involving one or more of 951L termination at Jenner 275S, increasing the
capacitor bank sizes at Amoco Empress 163S, and an SVC were identified to provide
voltage/reactive support to the Empress area. The alternatives are aimed at restoring the export
capability of the Alberta-Saskatchewan interconnection and to mitigate the impact of a 944L
contingency under various system conditions. As well, the upgrades will improve the
performance of the Empress area for maintenance-trip Category B conditions involving the 240
kV lines supplying the area by virtue of the reduced exposure and providing reactive power
support.

2.3.3.1       Description of alternatives
i)            Alt-Emp-3-1: 951L Jenner termination
951L Ware Junction 132S to Amoco Empress 163S presently terminates on deadends within
the Jenner 275S substation without being bussed at the substation. This alternative considers
bussing 951L at Jenner 275S and involves installation of one (1) new breaker and one half
diameter complete with three (3) 240 kV breakers. The cost of this alternative is $5.6 million (±
30%, 2007$).

ii)           Alt-Emp-3-2: 951L Jenner termination and addition of 54 MVAR
              capacitor banks
This alternative involves addition of 54 MVAr of capacitor bank at McNeill 840S and termination
of 951L at Jenner 275S as in Alt-Emp-3-1. Terminal limitations on 830L will be removed as part
of the development to bring the overall summer rating of the line to the full conductor rating of
177 MVA. The capacitor banks will be integrated into the existing automatic var-volt control
scheme at the substation. In order to provide flexibility in switching as well as to limit step
change during switching two (2) 27 MVAR capacitor banks are proposed instead one (1) 54
MVAr bank.

The total cost of this alternative including associated substation upgrades is $9.6 million (± 30%,
2007$).

Initially, adding the 54 MVAr in reactive power by expanding the existing 27 MVAr capacitor
banks at Amoco Empress 163S was considered. Siting investigations by AltaLink found that the
existing support structures are not sufficiently robust to hold the weight of an additional 27 MVAr
capacitor bank. As well, the large capacitor bank size was found to cause large step change
during switching. Amoco Empress 163S site was subsequently dropped as the investigation
showed that there is insufficient room at the substation for additional capacitor banks.

McNeill is selected as the location for the new capacitor banks for the following reasons. First,
the additional reactive power is required mainly to support export. Installing the capacitors at



                                Alberta Electric System Operator
Draft for Discussion                               24                                June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


McNeill 840S makes the reactive power support available where it is needed most. As well,
temporary over voltages that may otherwise occur in the Empress area due to excessive
capacitive compensation following a contingency involving the DC-tie will be avoided. Further,
as the capacitor banks will need to be dispatched as a function of various system conditions
including export schedules, area load and contingencies, integrating them into the existing
Var/Volt control scheme at the converter station facilitates effective operation of the capacitor
banks.

iii)           Alt-Emp-3-3: 951L Jenner termination and new SVC at Empress 394S
This alternative involves addition of a 50 MVAr SVC at Empress 394S, 54 MVAr of capacitor
bank at McNeill 840S and termination of 951L at Jenner 275S as in Alt-Emp-3-1. The total cost
of this alternative including associated substation upgrades is 28.2 million (± 30%, 2007$).

The location considered for the SVC is Empress 394S because of space limitations at Amoco
Empress 163S substation. Since the distance between the substations is small, an SVC located
at Empress 394S or any of the other Empress Area 138 kV substations will be equally effective
in providing reactive support to the area.

2.3.3.2        Contingency power flow analysis
The performance of the system with each of the Empress Area Reactive Power Support
Alternatives in place and selected elements removed from service was analyzed for the forecast
2012 heavy export summer peak Scenario (Scenario 3). Table 2-3 provides a summary of the
results for each of the three alternatives. Category B and Category C contingencies were
assessed in this analysis. A list of the contingencies studied and a detailed description of the
resulting system performance including drawings showing detailed study results are included in
Appendix C.

For category C contingency involving 951L and 944L or 945L contingencies the analysis
assumes the existing Amoco Empress 163S reverse power/undervoltage remedial action
scheme and the converter runback controls have acted due to very low voltages. These
contingencies remove the 240 kV feed to the Empress area. The area load and export to
Saskatchewan can not be supplied over the existing 138 kV lines regardless of the amount of
reactive power support added in the Empress area.

The Empress Area upgrades discussed in the preceding sections are common to all alternatives
and have been assumed to be in place in the analysis.




                                 Alberta Electric System Operator
Draft for Discussion                                25                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 2-3:        Summary of power flow study results for Empress area reactive power
                  support alternatives

  Alternative      System Performance Concern

  Emp 3-1          240 kV and 138 kV voltages in the Empress Area drop below minimum operating limits
                   despite all reactive support equipment being in place during an outage of 944L,951L or
                   945L (Category B)

                   945L and 951L Jenner 275S to Amoco Empress 163S are overloaded to 109%
                   (Category B). As the capacity of these lines is limited by current transformers, the
                   overloading can be addressed by changing the current transformer setting.

                   A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to
                   the Empress area. Under these conditions, voltages in the Empress area will be too
                   low to support full Empress Area load or export over the DC tie. Export to
                   Saskatchewan and a portion of the Empress Area load will be curtailed under these
                   conditions.

                   Under category C conditions involving 934L and 950L Anderson 801S to Ware
                   Junction 132S or 923L/927L and 924L/935L West Brooks 28S to Langdon 102S and
                   North Lethbridge 370S, voltages in the Empress area will be too low to support full
                   export over the DC tie. Under such conditions, Export to Saskatchewan will be
                   curtailed.



  Emp 3-2          945L and 951L Jenner 275S to Amoco Empress 163S are overloaded to 108%
                   (Category B). As the capacity of these lines is limited by current transformers, the
                   overloading can be addressed by changing the current transformer setting.

                   A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to
                   the Empress area. Under these conditions, voltages in the Empress area will be too
                   low to support full Empress Area load or export over the DC tie. Export to
                   Saskatchewan and a portion of the Empress Area load will be curtailed under these
                   conditions.

                   Under category C conditions involving 934L and 950L Anderson 801S to Ware
                   Junction 132S, voltages in the Empress area will be too low to support full export over
                   the DC tie. Under such conditions, Export to Saskatchewan will be curtailed.

  Emp 3-3          945L and 951L Jenner 275S to Amoco Empress 163S are overloaded to 108%
                   (Category B). As the capacity of these lines is limited by current transformers, the
                   overloading can be addressed by changing the current transformer setting.

                   A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to
                   the Empress area. Under these conditions, voltages in the Empress area will be too
                   low to support full Empress Area load or export over the DC tie. Export to
                   Saskatchewan and a portion of the Empress Area load will be curtailed under these
                   conditions.




                                 Alberta Electric System Operator
Draft for Discussion                                  26                                    June 6, 2007
     Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.3.3.3      Voltage stability analysis
The performance of each of Empress Area reactive power support alternatives with regard to
the voltage stability criteria was analyzed using the V-Q Method. The analysis is performed for
maximum export to Saskatchewan at 105% and 102.5% peak area load for Category B and
Category C contingencies respectively to test whether the 5% and 2.5% reactive power margin
requirement for the respective contingency category is met.

In the course of the analysis the other Empress Area upgrades discussed in previous sections
in particular the 240/138 kV transformation capacity upgrade at Amoco Empress 163S was
found to have material impact on the system’s reactive power margin. For this reason, the
voltage stability analysis is performed assuming those Empress Area upgrades are in place.

i)           Alternative Alt-Emp-3-1
Table 2-4 provides reactive power margin for the Empress area with Alternative Emp-3-1 in
place for each contingency studied. V-Q curves for Category B and Category C conditions are
provided in Figure C1-12 and Figure C1-13, of Appendix C, respectively.




                               Alberta Electric System Operator
Draft for Discussion                              27                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 2-4:        Voltage stability results for Alt-Emp-3-1
    Reference                  Contingency             Reactive           Reactive Power
    Chart                                              Power              Margin
                                                       Deficiency/        Requirement
                                                       Reserve            Met?
                                                       (MVAr) (1)

                            Category B results for Alternative Emp-3-1

                               Base Case                      -55                 Yes

                        1      944L                           19                  No
     Figure C1-12       2      945L                           15                  No
                        3      931L                           -46                 Yes
                        4      933L                           -25                 Yes
                        5      934L or 950L                   -13                 Yes
                        6      923L/927L or                   -2                  Yes
                               924L/935L

                            Category C results for Alternative Emp-3-1

                               Base Case                      -78                 Yes

                        1      944L & 951L (2)                -38                 Yes

    Figure C1-13        2      945L & 951L (2)                -40                 Yes

                        3      934L & 950L                   102                  No

                        4      923L/927L &                    60                  No
                               924L/935L
                        5      944L & 945L                    57                  No

                        6      931L & 933L                    -36                 Yes

    (1) Positive values represent deficiency where as negative values represent reserve.
    (2) The existing Amoco Empress 163S remedial action scheme modified to include tripping of the
        Saskatchewan tie is assumed to have opened the 240/138 kV transformation at Amoco Empress
        and the DC-tie with Saskatchewan following these contingencies.




                                Alberta Electric System Operator
Draft for Discussion                              28                                    June 6, 2007
      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


ii)           Alternative Alt-Emp-3-2
Table 2-5 provides reactive power margin for the Empress area with Alternative Emp-3-2 in
place for each contingency studied. V-Q curves for Category B and Category C conditions are
provided in Figure C2-12 and Figure C2-13, of Appendix C, respectively.

Table 2-5:        Voltage stability results for Alt-Emp-3-2
      Reference                        Contingency                Reactive        Reactive
      Chart                                                       Power           Power Margin
                                                                  Deficiency/     Requirement
                                                                  Reserve         Met?
                                                                  (MVAr) (1)

                                Category B results for Alternative Emp-3-2
                                       Base Case                       -92              Yes
                            1          944L                            -11              Yes
      Figure C2-12          2          945L                            -23              Yes
                            3          931L                            -87              Yes
                            4          933L                            -63              Yes
                            5          934L or 950L                    -51              Yes
                            6          923L/927L or 924L/935L          -41              Yes
                                Category C results for Alternative Emp-3-2
                                       Base Case                       -109             Yes
                            1          944L & 951L (2)                 -74              Yes
      Figure C2-13          2          945L & 951L (2)                 -76              Yes
                            3          934L & 950L                      69               No
                            4          923L/927L & 924L/935L            17               No
                            5          944L & 945L                      20               No
                            6          931L & 933L                     -67              Yes
              (1) Positive values represent deficiency where as negative values represent reserve.
              (2) The existing Amoco Empress 163S remedial action scheme modified to include tripping
                  of the Saskatchewan tie is assumed to have opened the 240/138 kV transformation at
                  Amoco Empress and the DC-tie with Saskatchewan following these contingencies.




                                  Alberta Electric System Operator
Draft for Discussion                                  29                                 June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


iii)           Alternative Alt-Emp-3-3
Table 2-6 provides reactive power margin for the Empress area with Alternative Emp-3-3 in
place for each contingency studied. V-Q curves for Category B and Category C conditions are
provided in Figure C3-12 and Figure C3-13, of Appendix C, respectively.

Table 2-6:         Voltage stability results for Alt-Emp-3-3
       Reference                  Contingency                 Reactive           Reactive
       Chart                                                  Power              Power Margin
                                                              Deficiency/        Requirement
                                                              Reserve            Met?
                                                              (MVAr) (1)

                               Category B results for Alternative Emp-3-3
                                  Base Case                   -134               Yes

                           1      944L                        -63                Yes

       Figure C3-12        2      945L                        -65                Yes

                           3      931L                        -129               Yes

                           4      933L                        -106               Yes

                           5      934L or 950L                -94                Yes

                           6      923L/927L or 924L/935L      -87                Yes


                               Category C results for Alternative Emp-3-3
                                  Base Case                   -157               Yes

                           1      944L & 951L (2)             -131               Yes

       Figure C3-13        2      945L & 951L (2)             -133               Yes

                           3      934L & 950L                 6                  No

                           4      923L/927L & 924L/935L       -52                Yes

                           5      944L & 945L                 -32                Yes

                           6      931L & 933L                 -120               Yes

(1) Positive values represent deficiency where as negative values represent reserve.
(2) The existing Amoco Empress 163S remedial action scheme modified to include tripping of the
    Saskatchewan tie is assumed to have opened the 240/138 kV transformation at Amoco Empress and
    the DC-tie with Saskatchewan following these contingencies.




                                 Alberta Electric System Operator
Draft for Discussion                                30                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.3.3.4      Preliminary siting assessment
The preliminary siting assessment indicates that existing substation sites can be developed to
accommodate the proposed developments.

2.3.3.5      Comparison and recommendation
Alt Emp-3-1 or re-termination of 951L at Jenner 275S reduces the reactive power deficiency by
about 80 MVAr by reducing the impact of a 944L Ware Junction 132S to Jenner 275S
contingency. However, the development is not sufficient to meet voltage stability criteria under
Category B conditions involving 944L, 945L or 951L as evidenced by the results of the V-Q
analysis. Therefore, Alt Emp-3-1 is dropped from further consideration.

Both Alt Emp-3-2 and Alt Emp-3-3 meet Category B requirements. Alt Emp-3-3 is superior in
terms of meeting Category C requirements as well as in the ability of the SVC to provide a
dynamic source of reactive power. However, the cost of Alt-Emp-3-2 is less than that of Alt-3-3
by $18.6 million.

Alt Emp-3-2 is selected as the preferred development based on the following considerations:

    •    Category C requirements will be met by the automatic curtailment of export and area
         load as provided for in the AESO reliability criteria.
    •    The capacitor banks that will be added at McNeill 840S converter station will be
         integrated into the existing converter VAr-Volt control scheme that controls switching of
         available capacitor and reactor equipment and DC transformer tap changers to limit
         power angle and reactive power/ac voltages within a specified range. The Var-Volt
         control is equipped with binary switching features which allow, for example, a 27 MVAr
         capacitor bank and a 17 MVAr reactor to be switched in simultaneously, when smaller
         changes in reactive power supply are required. As well, the Var-Volt control has a
         normal cycle of 10 seconds which will be overridden to initiate a more rapid switching of
         reactive power banks in the event of gross changes in reactive power demand. These
         features provide a reactive power capability that is nearly dynamic and thereby reduce
         the need for an SVC.
    •    ATCO Electric is planning to upgrade the converter control system with one that uses
         current technology by 2009. The work will facilitate integration of the capacitor banks.

2.4          Vauxhall & Medicine Hat areas
2.4.1        Vauxhall – Medicine Hat area 138 kV upgrades
The existing system performance analysis identified thermal and voltage concerns in the 138 kV
system supplying the Vauxhall and Medicine Hat areas following Category B contingencies
under a number of system operating conditions. Thermal overloads that were identified include:

    •    100L Brooks 121S to Medicine Hat 41S
    •    172L Taber 83S to Burdett 368Sd
    •    760L Empress 394S to Medicine Hat 41S and
    •    763L West Brooks 28S to Enchant Junction (This occurs under winter peak conditions
         only and can be addressed by increasing the winter rating of the line).

The critical contingency for overloading on 172L is 100L Brooks 121S to Tilley 498S where as
the critical contingency for overloading on 100L is 172L Taber 83S to Fincastle 336S. The


                              Alberta Electric System Operator
Draft for Discussion                            31                                June 6, 2007
       Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


overloads on 100L can not be fully addressed by increasing the rating of the line as the
maximum overload on the line will exceed the full conductor rating of the lines.

As well, contingencies on 172L and 100L result in voltage criteria violations. Currently, there are
six (6) 27 MVAr capacitor banks between Taber 83S and Medicine Hat 41S. Installation of
additional banks at any location between these substations to address the voltage concerns
associated with an outage of 172L Taber 83S to Fincastle 336S is not considered appropriate
as voltage control using the capacitor banks becomes increasingly complex. New transmission
lines into the area will address both the thermal capacity and voltage related constraints.

2.4.1.1        Description of alternatives
The following three alternatives, which are shown in Figure 2-5, have been identified to address
the above system performance concerns.

i)             Alt-VM-1-1: New Hays 421S to Burdett 368S 138 kV line
Alt-VM-1-2 involves construction of a single-circuit 138 kV line (approximately 45 km) from Hays
421S to Burdett 368S. The total cost of this alternative including associated substation upgrades
is $17.2 million (± 30%, 2007$).

ii)            Alt-VM-1-2: New Hays 421S to Bullhead 523S 138 kV line
Alt-VM-1-3 involves construction of a 138 kV line (approximately 100 km) from Hays 421S to
Bullshead 523S. The line will be routed, subject to siting constraints, generally east out of Hays
421S towards Redcliff before turning south into Bullshead 523S to facilitate future termination of
the line at a future substation near Redcliff north of Medicine Hat.

Two variations of this alternative are considered. The first option, or Option 1, is to build a
single-circuit line designed to 138 kV standards. The second option, or Option 2, is to build a
double-circuit line with one side strung designed for future 240 kV operation.

The cost (± 30%, 2007$) of Option 1 and Option 2 including associated substation upgrades is
$30.7 million and $64.3 million, respectively.

iii)           Alt-VM-1-3: New Hays 421S to Redcliff (new) 138 kV line
Alt-VM-1-3 involves the following additions:

       •   Construction of a new 138 kV switching station at Redcliff north of Medicine Hat
           (“Redcliff Substation”)
       •   Termination of 100L Brooks to Medicine Hat at the new station in an in-out arrangement
       •   Construction of a 138 kV line (approximately 90 km) from Hays 421S to the new Redcliff
           substation.

Two variations of this alternative have been considered. The first option, or Option 1, is to build
a single-circuit line designed to 138 kV standards. The second option, or Option 2, is to build a
double-circuit line with one side strung designed for future 240 kV operation.

The cost (± 30%, 2007$) of Option 1 and Option 2 including associated substation upgrades is
$33.2 million and $66.4 million, respectively.




                                 Alberta Electric System Operator
Draft for Discussion                                32                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure 2-5:                  Vauxhall/Medicine Hat area transmission line alternatives
                                                  To Anderson 801S &                                                                                                   To Oyen
                                               Sheerness Generating Station                                                                                             767S
                                                                       9L934/




                                                                                                                                                                                  7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                              Empress Liquids
                                                                                                                                                                    164S
                                                                         132S                                                                                           760AL
                                                                                                                              230S                                                              Amoco
                                            Bassano                                                                                                         Sandy Point    869                 Empress
                                             435S                    931L                                                                                                       L
                                                                                                                                                               204S                              163S
                                                                            Duchess                                                                             Empress     760L
                                                                             339S                           951L                                                              871L
                                                                                                                                                                  394S
                                                                                                            944L                             945L
                          To Queenstown                                        Cutting Lake                                     Jenner                                     Sand Hills 830L
                              504S                   853L                         227S                                           275S                                        341S
                                   935L
                                                                   827L814L                      Tilley                                                                          McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                               Brooks
                                                                                121S             498S                   Empress                                                Convertor
                                                                                                                                                                              Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                          763AL                                795L                                  Suffield
                                       Enchant                                                                        895S                  Chappice Lake           760L
                                        447S                                                                                                    649S
                                                           763L




                                                                                                                                    100L
                                                                                                                                   (892L)
                                                   Vauxhall
                                                                                          Hays                                           Alt-VM-1-3
                                                                     821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                               Medicine Hat
                                                                      Alt-VM-1-1
                                                                               Vauxhall                              Alt-VM-1-2
                                                                                                                                                  41S


                                                                                                                     172L
                                                                                                                                             172L (880L)
                                                                                                                                             Bullshead
                                                                                                                                                                Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)                     523S
                                                                                                                                             600L
                                                                                                                                                                  Hat
                                                         Taber                                                                                    Wind Farm
                                                                                                        2L




                                                          83S                                                                                     Project 513
      172L                           820L
                                                                                                      72




                                      Chin Chute                                        Taber Wind                                                  31 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      172AL
                                                                      (607L)




                      241S           Wind 30MW                                                                                                 Peace Butte
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield                             404S
                111S    146S                                                                                 107S
     725L              823L         11MW
                      L




                       Lakeview
                  725A




   Lethbridge
                         593S                                           Conrad
                                            66L




      674S
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                     Note: Line numbers in barckets denote new line numbers
               863L




                                         To
                                       Stirling                                                                    138 kV
                                        67S                                                                                                         Thermal Plant
            To                                                                                                     240 kV
                                                                                                                                                    Wind Farm
          Magrath
           225S                                                                                                    Planned
                                                                                                                                                    Proposed Wind Farm

                   To
           Great Falls, Montana                                                                                    Major Development at Substation
             (merchant line)

2.4.1.2            Line capacity upgrades
In addition to the above developments, the following transmission lines will be up rated by
removing clearance and/or terminal equipment limitations. The upgrade will bring the overall
thermal rating of the line to or close to the full conductor rating of 119 MVA. These uprates will
help in mitigating the overloading of the lines that have been identified and provide some room
for growth in load and generation supplied from the 138 kV system.

    •     100L Brooks 121S to Medicine Hat 41S – cost $8.3 million (±30%,2007$)
    •     763L West Brooks 28S to Taber 83S - cost $2.39 million (±30%,2007$)
    •     795L Brooks 121S to Hays 421S - cost $0.06 million (±30%,2007$)
    •     172L Taber 83S to Bullshead 523S - cost $9.6 million (±30%,2007$)




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                      33                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The uprates are common to all of the Vauxhall and Medicine Hat Area alternatives and are
assumed to be in place in the performance assessment of the alternatives.

2.4.1.3          Capacitor banks
One (1) 27 MVAr capacitor bank is proposed to support area voltages during an outage of 100L
Brooks 121S to Tilley 498S. The cost (± 30%, 2007$) of this development is $1.73 million. This
development is common to all of the Vauxhall-Medicine Hat Area alternatives.

2.4.2            Performance evaluation
The performance analysis for each Vauxhall-Medicine Hat area alternative includes all of
recommended developments for the rest of the Southeast. As such, the analysis performed for
this area not only provides a comparative assessment of the performance of the alternatives for
the area but also an assessment of the performance of the southeast system as a whole with all
of the potential Part A developments in place.

2.4.2.1          Base case study scenarios
The performance of the system with each of Vauxhall – Medicine Hat Area 138 kV Upgrade
Alternatives in place and selected elements removed from service was analyzed for the 2012
study period. The analysis is performed assuming the developments identified in previous
sections for the Lethbridge, Brooks and Empress planning areas are in place.

The most onerous system scenarios from the Revised Need Assessment and Alternative
Screening Document reproduced in Table 1-2 were selected for the detailed analysis and are
presented in Table 2-7.

Table 2-7:              Base case study scenarios                                   Saskatchewan
                                                   Medicine Hat

                                                   interchange




                                                                                     interchange
                   Study years




                                                                       generation
                                                                       SE Alberta




                                                                                      Alberta to
                                   Area load
      Scenario




                                                      City of




                                                                         wind
                                                        net




                                 summer                                             150 MW
      3a          2012                            26 MW load             zero
                                  peak                                               export

                                 summer           50 MW net       Maximum within    150 MW
      3b          2012
                                 minimum          generation        threshold        export

                                 summer                                             150 MW
      4a          2012                            26 MW load             zero
                                  peak                                               import

                                 summer           50 MW net       Maximum within    150 MW
      4b          2012
                                 minimum          generation        threshold        import




                                               Alberta Electric System Operator
Draft for Discussion                                              34                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.4.2.2       Base case study results
There were no system performance concerns identified for each of the three Vauxall-Medicine
Hat alternatives. A detailed list of the contingencies studied along with a brief description of the
resulting system performance and drawings showing detailed study results are included in
Appendix D.

2.4.2.3       Sensitivity scenarios
The performance of the transmission system is also tested for possible but uncertain future
developments in load or generation in the region. Such possible developments include
development of the Bow City generation, an incremental increase in the wind reliability threshold
that would increase the wind generation potential within southeast Alberta from 141 MW to 226
MW, and increase in net demand of the City of Medicine Hat. The sensitivity analysis will be
used to determine the impact of such developments as an additional factor in the selection of
the appropriate development for the region. A description of the sensitivity scenarios is provided
in Table 2-8.

The analysis is performed assuming the developments identified in previous sections for the
Lethbridge, Brooks and Empress planning areas are in place.

Table 2-8:            Sensitivity study scenarios




                                                                                                     Saskatchewan
                                                                         Medicine Hat
        Performance




                                                                         interchange




                                                                                                      interchange
                                      Study years




                                                                                        generation
                                                                                        SE Alberta




                                                                                                       Alberta to
                                                        Area load
                          Scenario
          System

           Tested




                                                                            City of




                                                                                          wind
                                                                              net




     Impact of Bow
                    1S               2012           summer peak 26 MW load                zero         zero
      City Addition

      Impact of
      increased
                         2S          2012           summer peak 90 MW load                zero         zero
     Medicine Hat
     net demand

        Impact of
      incremental                                    summer              50 MW net
                         3S          2012                                               226 MW         zero
     increase wind                                   minimum             generation
        threshold



2.4.2.4       Sensitivity scenario results
Table 2-9 provides a summary of the system performance concerns that were identified for each
of the three Vauxhall-Medicine Hat alternatives. A detailed list of the contingencies studied
along with a brief description of the resulting system performance and drawings showing
detailed study results are included in Appendix D.




                                           Alberta Electric System Operator
Draft for Discussion                                                35                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 2-9:                       Summary of sensitivity scenario results
     Alternative

                   Sensitivity
                    Scenario
                                              System performance Concern Identified




                                   •   763L West Brooks 28S to Enchant Junction is loaded close to its rating
                      S1




                                       following an outage of 795L Brooks 121S to Hays 421S

                                   •   Voltages in the Medicine Hat Area are depressed under normal
                                       conditions. 40 MVAr in reactive power support assumed to bring
                                       voltages to desirable levels.

                                   •   760L Medicine Hat 41S to Empress 394S is overloaded following an
     Alt VM-1




                                       outage of 100L Brooks 121S to Tilley 498S
                      S2




                                   •   100L Brooks 121S to Tilley 498S is marginally overloaded under an
                                       outage of 760L Chappice Lake 649S to Amoco Empress 163S

                                   •   Voltages drop by more than 9 percent following an outage of 100L
                                       Brooks 121S to Tilley 498S

                                   •   760L Medicine Hat 41S to Empress 394S is fully loaded following an
                      S3




                                       outage of 100L Medicine Hat 41S to Tilley 498S
                      S1




                                                Similar concerns as identified for Alt-VM-1 above


                                   •   Voltages in the Medicine Hat Area would be depressed under normal
                                       conditions. 40 MVAr of reactive power support would be required to
                                       address the voltage conditions and were included in the power flow
                                       analysis.

                                   •   760L Empress 394S to Medicine Hat 41S is loaded close to its thermal
                                       rating following an outage of 100L Brooks 121S to Tilley 498S
     Alt VM-2


                      S2




                                   •   100L Brooks 121S to Tilley 498S is loaded close it its thermal rating
                                       under an outage of 172L Taber 83S to Fincastle 336S or 760L Empress
                                       394S to Chappice Lake 649S

                                   •   Voltages drop by 10 percent to below 0.9 per unit following an outage of
                                       172L Taber 83S to Fincastle 336S
                      S3




                                                                        None
   VM-3
    Alt



                      S1




                                                Similar concerns as identified for Alt-VM-1 above




                                               Alberta Electric System Operator
Draft for Discussion                                               36                                   June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




     Alternative

                     Sensitivity
                      Scenario
                                              System performance Concern Identified




                                   •   Voltages in the Medicine Hat Area are depressed under normal
                                       conditions. 60 MVAr in reactive power support added to bring voltages
                                       to desirable levels.

                                   •   100L Redcliff (new) to Medicine Hat 41S is overloaded under an outage
                                       of 172L Taber 83S to Fincastle 336S

                                   •
                        S2




                                       760L Empress 394S to Medicine Hat 41S is loaded close to its capacity
                                       following an outage of 100L Redcliff (new) to Medicine Hat

                                   •   100L Brooks 121S to Tilley 498S is loaded close it its thermal rating
                                       under an outage of 172L Taber 83S to Fincastle 336S

                                   •   Voltages drop by 10 percent to below 0.9 per unit following an outage of
                                       172L Coaldale 254S to Taber 83S

                                   •   172L Fincastle 336S to Taber 83S is overloaded under an outage of
                                       172L Medicine Hat 41S to Bullshead 523S

                                   •   172L Bullshead 523S to Medicine Hat 41S is overloaded for an outage
                                       of 172L Fincastle 336S to Taber 83S
                        S3




                                   •   760L Medicine Hat 41S to Empress 394S is overloaded for an outage of
                                       100L Redcliff (new) to Medicine Hat 41S

                                   •   100L Redcliff (new) to Medicine Hat 41S is marginally overloaded
                                       during an outage of 760L Medicine Hat 41S to Chappice Lake 649S



2.4.2.5                Preliminary siting assessment
A high level assessment of the planning area identified the following potential conditions in each
of the alternatives:

    •              located through irrigated farm land and uncultivated lands;
    •              irrigation pivots;
    •              significant amounts of native grassland;
    •              potential river crossings;
    •              wetland areas;
    •              construction would likely be required in winter as there are potential environmental
                   constraints that may impact construction;
    •              environmental studies would be required at least one year prior to construction with the
                   potential for Burrowing Owls, ground nesting species and waterfowl in the study area.




                                               Alberta Electric System Operator
Draft for Discussion                                               37                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.4.2.6      Comparison and recommendation
Table 2-10 provides a comparison of the three alternatives for the Vauxhall/Medicine Hat Areas.

Table 2-10:       Comparison of Vauxhall-Medicine Hat area alternatives
                           Alt-VM-1                    Alt-VM-2                  Alt-VM-3

  Cost                     $17.4 million               $30.7 million for s/c     $33.2 million for s/c
                                                       138 kV construction       138 kV construction
                                                       and $64.3 million for     and $66.4 million for
                                                       d/c 240 kV                d/c 240 kV
                                                       construction              construction

  High level siting        Similar                     Similar                   Similar
  assessment

  Performance under        Meets requirements.         Meets requirements.       Meets requirements
  base case scenarios      Provides the strongest
                           voltage support for a
                           172L Taber 83S to
                           Fincastle 336S outage

  Sensitivity Case 1:      Marginally meets the        similar                   similar
  Bow City                 requirements
  Development

  Sensitivity Case 2:      Additional                  Better performance;       Additional
  Medicine Hat DTS         reinforcement will be       however additional        reinforcement will be
  increases to 90 MW       required                    reinforcement will be     required
                                                       required

  Sensitivity Case 3:      Marginally meets the        Meets the                 Additional
  full Wind Farm           requirements                requirements              reinforcement will be
  Project 513                                                                    required
  development

  Relationship with        Line will continue to be    Line can be converted     Line can be converted
  Part B development.      needed to support           to 240 kV if it is        to 240 kV if it is
                           load if Part B              constructed to 240 kV     constructed to 240 kV
                           proceeds.                   standards initially and   standards initially and
                                                       VM-1 development will     VM-1 development will
                                                       be constructed to         be constructed to
                                                       support load.             support load.

                                                       Line will become          Line will become
                                                       inappropriate if built    inappropriate if built
                                                       to138 kV standards        to138 kV standards
                                                       when the Part B           when the Part B
                                                       development is in         development is in
                                                       place.                    place.

                                                       Line would limit the      Line would limit the
                                                       Part B development        Part B development
                                                       Alternatives.             Alternatives.




                               Alberta Electric System Operator
Draft for Discussion                                  38                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Alt-VM1 is selected as the preferred development based on the following considerations:

    •    It is the least cost alternative;
    •    It better meets the base case Part A requirements;
    •    The line will continue to be needed when Part B development proceeds; and
    •    It allows flexibility in routing the 240 kV line for the Medicine Hat area generation in the
         Part B development.

2.5          Line capacity upgrades
Table 2-11 and Table 2-12 respectively provide a list of existing lines in the Southeast whose
ratings are to be upgraded by either removing clearance limitations or terminal equipment
limitations. The table also provides the existing rating of the lines and the rating that will be
achieved as a result of the upgrade. The upgrades maximize the capacity of existing facilities
and are proposed to mitigate potential overloading of the lines and to provide some margin for
abnormal operating conditions and growth.

Table 2-11:       Proposed line rating increases requiring clearance corrections
                                                               Existing    New Rating
                                                                                         Cost in
                                                               Rating        (MVA)
                                                                                         millions
                                                                (MVA)
                                                                                         (±30%,
                                                             Sum    Win    Sum    Win    2007$)

    100L Brooks 121S to Tilley 895S                          96      96    119    145
                                                                                           5.20
    100L Tilley 895S to Suffield 895S                        69      96    119    145
    892L Suffield 895S to Medicine Hat 41S (formerly 100L)   67      96    119    145      3.10
    610L Taber 83S to Fincastle 336S (formerly 172L)         85      90    119    145      3.52
    612L Fincastle 336S to Burdett 368S (formerly 172L)      85      90    119    145      1.90
    879L Burdett 368S to Bullshead 523S (formerly 172L)      85      90    119    145      4.13
    763L West Brooks 28S to Enchant Junction                 117     89    121    115
    763L Enchant Junction to Vauxhall 158S                   121     92    121    115      2.39
    763L Vauxhall 158S to Taber 83S                          121    107    121    115
    821L Vauxhall 158S to Hays 421S                          85      90    119    145      0.72
                                                              Total Cost (±30%,2007$)      21.0




                               Alberta Electric System Operator
Draft for Discussion                             39                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 2-12:       Proposed line rating increases requiring terminal modifications
                                                             Existing    New Rating
                                                                                        Cost in
                                                             Rating        (MVA)
                                                                                        millions
                                                              (MVA)
                                                                                        (±30%,
                                                           Sum    Win    Sum    Win     2007$)

    795L Brooks 121S to Hays 421S                           96     96    119    146      0.06
    827L West Brooks 28S to Brooks 121S                    143    172    167    191      0.18
    830L Amoco Empress 163S to McNeill 840S                167    191    177    191      0.06
    7L760 Empress Liquids Junction to Oyen 767S             99     99    114    146
                                                                                         0.02
    7L98 Oyen 767S to Monitor 774S (formerly 7L224)         99     99    114    146
    951L Ware Junction 132S to Empress 163S                333    333    599    723      0.21
    945L Jenner 275S to Amoco Empress 163S                 333    333    599    723      0.24
    944L Ware Junction 132S to Jenner 275S                 466    499    599    723      0.12
    923L West Brooks 28S to Milo Junction                  499    499    599    723      0.17
    923L North Lethbridge 370S to Milo Junction            333    333    481    581      0.08
    935L West Brooks 28S to Milo Junction                  499    499    599    723      0.17
    927L Milo Junction to Langdon 102S                     499    599    604    723      0.10
    924L North Lethbridge 370S to Milo Junction            333    333    481    581      0.12
    924L Langdon 102S to Milo Junction                     481    581    609    705      0.81
    931L West Brooks 28S to Ware Junction 132S             499    499    592    726      0.06
    933L West Brooks 28S to Anderson 801S (AltaLink)       499    499    592    726      0.06
    934L West Brooks 28S to Anderson 801S (AltaLink)       584    705    584    705      0.00
    950L Ware Junction 132S to Anderson 801S (AltaLink)    594    713    599    713      0.00
    9L934 Ware Junction 132S to Anderson 801S (ATCO)       498    498    519    663
    9L933 West Brooks 28S to Anderson 801S (ATCO)          498    498    519    663      0.12
    9L950 Ware Junction 132S to Anderson 801S (ATCO)       498    498    519    663
                                                            Total Cost (±30%,2007$)       2.6
2.6          Short circuit analysis
Regional Planning group is working on short circuit analysis to be included in this report;
however it is not anticipated that this analysis will impact the recommendations.
2.7          Transient stability analysis
Regional Planning group is working on transient stability analysis to be included in this
report; however it is not anticipated that this analysis will impact the recommendations.




                              Alberta Electric System Operator
Draft for Discussion                              40                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


2.8          Summary of proposed Part A development and cost estimates
Table 2-13 provides a summary of the developments identified for Part A along with the cost
estimate (±30%) for each development. The costs are in 2007 dollars and do not include
allowance for funds used during construction (AFUDC).

An overview of the southeast transmission system including the proposed developments,
simplified substation single line diagrams of affected substations and maps identifying potential
routes for the proposed transmission lines are provided in Appendix A.

Table 2-13:       Summary of Part A developments

      Description                                                                Cost
                                                                            (2007$, millions)

      Lethbridge Area
      Rebuild (partial) of 734L/813L North Lethbridge 370S to MacDonald            6.6
      146S to double-circuit
      North Lethbridge 370S 200 MVA 240/138 kV transformer addition                8.4
      Brooks Area
      Replace two (2) 240/138 kV transformers at West Brooks 28S with two         12.2
      (2) 400 MVA units
      West Brooks 28S to Brooks 121S 138 kV line addition & 100L                   9.2
      reconfiguration
      27 MVAr Capacitor Bank addition at Tilley 498S                               1.7
      Empress Area
      Salvage one 240/138 kV transformer at Amoco Empress 163S and add            15.4
      2 (two) 400 MVA units
      869L Empress 394S termination and 760L reconfiguration                       2.9
      951L Jenner 275S termination                                                 5.6
      Add two (2) 27 MVAr Capacitor Banks at McNeill 840S                          4.0
      Vauxhall Area
      New Hays 421S to Burdett 368S 138 kV line                                   17.2
      Miscellaneous Upgrades
      Existing line rating upgrades requiring clearance corrections               21.0
      Existing line rating upgrades requiring terminal medications                 2.6
                                       Part A Development Estimated Cost         $106.5




                                Alberta Electric System Operator
Draft for Discussion                                 41                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


These developments have an estimated cost of $106.5 million (±30%, 2007). The entire amount
is deemed a system cost by the AESO. A detailed break down of the costs provided by the
incumbent TFO is included in Appendix F. It is to be noted that some of the estimates were
provided in 2006 dollars and have been escalated by the AESO to bring them to 2007 dollars.

The anticipated in-service date for the facilities required in the Part A development is in the 2009
to 2010 time frame.

Given the current uncertainty regarding the implications of the Market and Operational
Framework on the development of wind generation, the AESO has pursued a phased approach
to regional transmission system reinforcement in the southeast Alberta. The first phase (Part A)
of the southeast Alberta regional transmission development has been primarily based, in
addition to load supply adequacy and Alberta-Saskatchewan interconnection requirements, on
the proposed SE wind farms total in 141of MW installed capacity that are within the 900 MW
threshold. The AESO is seeking approval for the Part A regional transmission development.




                             Alberta Electric System Operator
Draft for Discussion                            42                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.0          Evaluation of alternatives – Part B development
The transmission development that is considered in this section is conditional upon the wind
generation operational threshold being removed to allow interconnection of additional potential
wind generation in southeast Alberta.

Seven alternatives were identified in the Need Assessment and Alternative Screening
Document, finalized in March 2007, to provide bulk capacity to support the wind generation
development in the Southeast. Through the alternative screening processes, two of the seven
alternatives; namely Alt-B-1 and Alt-B-7, were removed from the alternatives to be assessed in
detail within this analysis. Both Alt-B-1 and Alt-B-7 were sourced from the Lethbridge area and
thus provide weaker support to the 138 kV system than those alternatives sourced out of West
Brooks 28S. As well, these alternatives would increase congestion on 923L and 924L. The
recommended development, subject to the Market and Operational Framework, will be selected
from the remaining five alternatives which are described below.

Due to the magnitude of proposed generation development 240 kV is considered the
appropriate voltage level for the bulk of the new transmission development. The five alternatives
considered in the detailed analysis are based on two types of 240 kV development alternatives.

    1. The first type of alternatives involves establishing a 240 kV grid and transformation
       terminals that are dedicated for the interconnection of the various wind farms and would
       not be integrated with the load serving 138 kV system initially.
    2. The second type of alternatives involves a 240 kV development that is integrated with
       the load serving 138 kV system at selected locations. Alternatives of this type expose
       the underlying 138 kV lines to overloads under normal and contingency conditions due
       to parallel flows.
3.1          Base case points of connection
Table 3-1 provides base case points of connection for each of the proposed generators or
groups of generators in the Southeast that is assumed in the development of transmission
system development alternatives. The base case point of connection defines the extent of
system development as opposed to customer-funded development in each of the alternatives.
That means, for example, the maximum extent of system development for the Bullshead area in
each of the alternatives will be up to Bullshead 523S subject to siting constraints.

It is to be noted that actual points of connection will be determined through the interconnection
process for each of the proposed wind farm and may be different from the base case points of
connection considered here. For example, Project 514 may be connected to 607L Fincastle
336S to Conrad 135S in a T-Tap arrangement by building a shorter line to reconnect the Taber
Wind farm directly to Fincastle 336S subject to the viability of uprating 607L to accommodate
the larger wind farm.




                             Alberta Electric System Operator
Draft for Discussion                            43                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 3-1:        Base Case Points of Connection
    Generator                       Requested     Base Case Point of Connection
                                    Capacity
    Wind Farm Project 513           116.4         Bullshead 523S
    Seven Persons Wind farm         120
    Wild Rose Wind Farm             200
    Wind Farm Project 514           102           Fincastle 336S
                       (1)
    Taber Wind Farm                 80
    Chin Chute Wind Farm(1)         30            172L Coaldale 254S to Taber 83S
    Wind Farm Project 534           75            172L Burdett 368S to Bullshead 523S
    Wind Farm Project 590           99            Empress 394S
    Wind Farm Project 617           100           Sand Hills 341S or other Empress Area
                                                  substation
             (1) The interconnection facilities for these wind farms have been recently completed




                                Alberta Electric System Operator
Draft for Discussion                                44                                  June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.2                Alternative B-2a
3.2.1              Description
Alternative Alt-B-2a envisages a dedicated 240 kV development sourced out of West Brooks
28S to interconnect new wind generation collecting stations at or near Fincastle 336S and
Bullshead 523S in the manner shown in Figure 3-1. The 240 kV development utilizes twin 477
kcmil conductors with a summer/winter capacity of approximately 600/744 MVA. This alternative
involves:

Figure 3-1:                  Part B transmission development: Alternative B-2
                                                  To Anderson 801S &                                                                                                        To Oyen
                                               Sheerness Generating Station                                                                                                  767S
                                                                       9L934/




                                                                                                                                                                                      7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction                                          Wardlow
                                                                                                                                                                 Empress Liquids
                                                                                                                                                                       164S
                                                                         132S                                                 230S                                         760AL                    Amoco
                                            Bassano                                                                                                            Sandy Point   869                   Empress
                                             435S                   931L                                                                                                         L
                                                                                                                                                                  204S                               163S
                                                                            Duchess                                              Jenner                                       760L
                                                                                                                                                                   Empress
                                                                                                            951L                  275S
                                                                             339S                                                                                    394S     871L
                                                                                                            944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                    Sand Hills 830L
                                                     853L                                                                                                     Project 590
                              504S                                                227S                                                                                           341S
                                                                    814L                                                                                        99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                 Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                         Project 617
                                                                                                                                                         100 MW
                                                                                                                                                                                   Convertor
                                                                                                                                                                                  Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                                                               795L




                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                  Chappice Lake               760L
                                        447S                                                                                                    649S
                                                           763L




                                                                                                                                    100L
                                                                                                                                   (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                    Medicine Hat

                                                                               Vauxhall                                                                41S


                                                                                                                    172L
                                                                                                                                               172L (880L)
                                                                                                                                              Bullshead
                                                                                                                                                                      Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                  (879L)
                                                                                                                                      New
                                                                                                                                                523S
                                                                                                                                             N.O.


                                                                                                                                              600L
                                                                                                                                                                        Hat
                                                         Taber                                                     Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                   Wind Farm
                                                                                                                   Project 534
                                                                                                        2L




                                                          83S New                                                                                  Project 513
      172L                           820L                                                                            75 MW
                                                                                                      72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                  128 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      (607L)
                                                                      172AL




                      241S           Wind 30MW                                                                                   Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                 107S
     725L              823L         11MW                                               Wind Farm                                    120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad
                                            66L




      674S                                                                              102 MW
                      824L                                               135S                             Note: Line numbers in barckets denote new line numbers
       Riverbend
        618S          Lethbridge                                                                                   138 kV                               Thermal Plant
               863L




                                         To
                                       Stirling                                                                    240 kV
                                        67S
                                                                                                                                                        Wind Farm
                                                                                                                   Planned
            To                                                                                                                                          Proposed Wind Farm
          Magrath
           225S


                   To
                                                                                                              Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)                                                                                  Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                      45                                                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Substation Development
   • A new wind farm collector transformation station at or near Fincastle 336S complete with
      a 240/320/400 MVA transformer;
   • A new wind farm collector transformation station at or near Bullshead 523S complete
      with a 240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;

Transmission Line Development
   • A new double-circuit 240 kV line both sides strung from West Brooks 28S to the
      Vauxhall 158S area.
   • A new 240 kV line double-circuit one side strung to extend one of the new circuits from
      West Brooks 28S to the Fincastle 336S area 240 kV substation;
   • A new 240 kV line double-circuit one side strung to extend the second circuit from West
      Brooks to the Bullshead 523S area substation;
   • Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
      substation in an in-out arrangement, and
   • Re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead 523S
      area substation in an in-out arrangement.

The estimated cost of Alternative B-2a including associated substation upgrades is $186 million
(± 50%, 2007$).

3.2.2        Rationale for Alt-B-2a
In this alternative the dedicated wind generation collection stations established near Fincastle
336S and Bullshead 523S will collect the output of proposed wind farms in the respective area
and deliver it to the existing to 240 kV grid at West Brooks 28S over the new 240 kV lines. The
new 240 kV development is not tied to the 138 kV system to avoid parallel flows in the 138 kV
system.

Serving the Fincastle and Bullshead area generation off the new 240 kV development allows
interconnection of Wind Farm Project 534, which is located east of Burdett 368S, via the
existing 138 kV system. The proposed Empress area wind farms which are assumed to be
connected radially are not expected to require additional transmission since the Empress area is
a net load area supplied from two existing 240 kV lines.

Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area 240 kV
substation in an in-out arrangement will allow picking up the existing Taber wind farm without
additional 138 kV transmission lines. Conrad 135S load will be normally supplied from the new
240 kV source and will have a back up supply from Fincastle 336S for a 240 kV contingency.

Similarly, re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead
523S area 240 kV substation in an in-out arrangement will allow picking up Project 513 wind
farm, which is planned to be interconnected via 600L, without additional 138 kV transmission
lines. Peace Butte 404S load will be normally supplied from the new 240 kV source and will
have a back up supply from Bullshead 523S for a 240 kV contingency.

The 240 kV reactor at the new Bullshead area substation is required to prevent overvoltages in
the 240 kV system when the new 240 kV lines are lightly loaded, for instance when the area
wind farms are not generating.



                             Alberta Electric System Operator
Draft for Discussion                            46                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.3          Alternative Alt-B-2b
3.3.1        Description
Alternative B-2b is the same alternative as Alt-B-2a with the exception of the conductor utilized
for the double-circuit portion of the 240 kV development from West Brooks 28S to Vauxhall
area. Alternative B-2b utilizes a twin 795 kcmil bundled conductor in stead of the twin 477 kcmil
bundled conductor utilized for the line in Alternative B-2a. The rest of the 240 kV development in
Alternative B-2b utilizes the same twin 477 kcmil conductor as Alternative B-2a.

The estimated cost of Alternative B-2b including associated substation upgrades is $197 million
(± 50%, 2007$).

3.3.2        Rationale for Alt-B-2b
A twin 795 kcmil bundled conductor is considered for the double circuit portion of the 240 kV
development from West Brooks 28S to Vauxhall area to provide additional capacity in the two
circuits. Unlike the 240 kV double-circuit segments from the Vauxhall area to the new Fincastle
or Bullshead area substations which have only one line strung initially, both circuits of the West
Brooks 28S to the Vauxhall area double-circuit line are utilized initially. The use of the larger
conductor is therefore considered for this segment to prevent the segment from becoming a
bottleneck when the second 240 kV circuits to the Fincastle or Bullshead areas are strung to
cater for additional generation development in the future.

A twin 795 kcmil bundled conductor provides an additional winter/summer capacity of
approximately 240/290 MVA per circuit compared to a twin 477 kcmil bundled conductor.




                             Alberta Electric System Operator
Draft for Discussion                            47                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.4            Alternative Alt-B-3a
3.4.1          Description
Alternative B-3a envisages a dedicated 240 kV development sourced out of West Brooks 28S to
interconnect new wind generation collecting stations in the Fincastle 336S and in the Bullshead
523S areas in the manner shown in Figure 3-2. The entire 240 kV development utilizes twin 477
kcmil conductors with a summer/winter capacity of approximately 600/744 MVA. This alternative
involves:

Figure 3-2:               Part B transmission development: Alternative B-3




                                                                                          7L760/760L
                                                         795L
                                       763L
                   924L

                          923L




                                                                  2L
                                                                72
                                                172AL
                                                (607L)
                 L
             725A




                                 66L
            863L




                                              Alberta Electric System Operator
Draft for Discussion                                             48               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Substation Development

    •    A new wind farm collector transformation station at or near Fincastle 336S complete with
         a 240/320/400 MVA transformer;
    •    A new wind farm collector transformation station at or near the Bullshead 523S complete
         with a 240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;

Transmission Line Development

    •    A new 240 kV line double-circuit both sides strung from West Brooks 28S to the
         Fincastle 336S area 240 kV station;
    •    A new 240 kV line double-circuit one side strung from the Fincastle 336S area 240 kV
         station to the new Bullshead 523S area 240 kV substation;
    •    Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
         substation in an in-out arrangement, and
    •    Re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead 523S
         area substation in an in-out arrangement.

The estimated cost of Alternative B-3a including associated substation upgrades is $196 million
(± 50%, 2007$).

3.4.2        Rationale for Alt-B-3a
Like in Alt-B-2, in this alternative the dedicated wind generation collection stations established
near Fincastle 336S and Wind Farm Project 513 will collect the output of proposed wind farms
in the respective area and deliver it to the existing to 240 kV grid at West Brooks 28S over the
new 240 kV lines. The new 240 kV development is not tied to the 138 kV system to parallel
flows in the 138 kV system. Since the Fincastle to West Brooks segment of the 240 kV
development could be loaded up to 618 MW initially, stringing both sides of the 240 kV circuit is
required.

Serving the Fincastle and Bullshead area generation off the new 240 kV development will allow
interconnection of Wind Farm Project 534, which is located east of Burdett 368S, via the
existing 138 kV system. The proposed Empress area wind farms which are assumed to be
connected radially are not expected to require additional transmission since the Empress area is
a net load area supplied from two existing 240 kV lines.

Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area 240 kV
substation in an in-out arrangement will allow picking up the existing Taber wind farm without
additional 138 kV transmission lines. Conrad 135S load will be normally supplied from the new
240 kV source and will have a back up supply from Fincastle 336S for a 240 kV contingency.

Similarly, re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead
523S area 240 kV substation in an in-out arrangement will allow picking up Project 513 wind
farm, which is planned to be interconnected via 600L, without additional 138 kV transmission
lines. Peace Butte 404S load will be normally supplied from the new 240 kV source and will
have a back up supply from Bullshead 523S for a 240 kV contingency.




                              Alberta Electric System Operator
Draft for Discussion                            49                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The 240 kV reactor at the new Bullshead area substation is required to prevent overvoltages in
the 240 kV system when the new 240 kV lines are lightly loaded, for instance when the area
wind farms are not generating.




                             Alberta Electric System Operator
Draft for Discussion                            50                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.5          Alternative Alt-B-3b
3.5.1        Description
Alternative B-3b is the same alternative as Alt-B-3a with the exception of the conductor utilized
for the double-circuit 240 kV development from West Brooks 28S to the new Fincastle area
substation. Alternative B-3b utilizes a twin 795 kcmil bundled conductor for this portion of the
240 kV developments instead of the twin 477 kcmil bundled conductor utilized for the lines in
Alternative B-3a. The rest of the 240 kV developments in Alternative B-3b utilize the same twin
477 kcmil conductor as Alternative B-3a.

The estimated cost of Alternative B-3b including associated substation upgrades is $219 million
(± 50%, 2007$).

3.5.2        Rationale for Alt-B-3b
A twin 795 kcmil bundled conductor is considered for the double-circuit 240 kV development
from West Brooks 28S to the new Fincastle area substation to provide additional capacity in the
two circuits. The two circuits of the double-circuit line from West Brooks 28S to the new
Fincastle area substation serve generation developments in both the Fincastle and Bullshead
areas. Together, the two circuits will carry a total of about 600 MW of net generation when all of
the proposed generation in the two areas is in place. If twin 477 kcmil conductors which have a
summer rating of 600 MVA are used for the lines, one circuit will be fully loaded, when the other
circuit is out of service. A twin 795 kcmil conductor will provide an additional summer/winter
capacity of approximately 240/290 MVA over a twin 477 kcmil bundled conductor. The use of
the larger conductor is therefore considered for this portion of the 240 kV developments to
prevent the segment from becoming a bottleneck when additional generation development
takes place in the future.




                             Alberta Electric System Operator
Draft for Discussion                            51                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.6            Alternative Alt-B-4
3.6.1          Description
Alternative Alt-B-4 envisages a 240 kV development sourced out of West Brooks 28S to
interconnect new wind generation collecting stations in the Fincastle 336S and Bullshead 83S
areas in the manner shown in Figure 3-3. The 240 kV development also includes a 240/138 kV
transformation at or near Vauxhall 158S to reinforce the existing 138 kV system at Vauxhall
158S. This alternative does not interconnect the 240 kV to the 138 kV in the Fincastle and
Bullshead areas. The 240 kV development utilizes twin 477 kcmil conductors with a
summer/winter capacity of approximately 600/744 MVA.

Figure 3-3:               Part B transmission development: Alternative B-4




                                                                                              7L760/760L
                                                                                      869
                                                                                          L
                                                         795L
                                       763L
                   924L

                          923L




                                                                L  2
                                                                72




                   734L
                                                172AL
                                                (607L)




                          813L
                          823L
                 L
             725A




                                 66L
            863L




                                              Alberta Electric System Operator
Draft for Discussion                                             52               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Substation Development
   • A new 240 kV substation at or near Vauxhall 158S complete with a 240/320/400 MVA
      240/138 kV transformer;
   • A new wind farm collector transformation station at or near Fincastle 336S complete with
      a 240/320/400 MVA transformer;
   • A new wind farm collector transformation station at or near Bullshead 523S complete
      with a 240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;

Transmission Line Development
   • A new 240 kV line double-circuit both sides strung from West Brooks 28S to the new
      Vauxhall area 240 kV substation;
   • A new 240 kV line double-circuit one side strung from the new Vauxhall 158S area 240
      kV station to the new Fincastle 336S area 240 kV substation;
   • A new 240 kV line double-circuit one side strung from the new Vauxhall area 240 kV
      station to the new Bullshead 523S area substation; and
   • Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
      substation in an in-out arrangement, and
   • Re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead 523S
      area substation in an in-out arrangement.

The estimated cost of Alternative B-4 including associated substation upgrades is $208 million
(± 50%, 2007$).

3.6.2        Rationale for Alt-B-4
Like the previous alternatives, in this alternative the dedicated wind generation collection
stations established near Fincastle 336S and Bullshead 523S will collect the output of existing
and proposed wind farms in the respective area and deliver it to the existing to 240 kV grid at
West Brooks 28S over the new 240 kV lines. The new 240 kV development is tied to the 138 kV
system at Vauxhall 158S to reinforce the load serving 138 kV system. Stringing both sides of
the 240 kV circuit is required to meet Category B requirements.

Serving the Fincastle and Bullshead area generation off the new 240 kV development may allow
interconnection of Wind Farm Project 534, which is located east of Burdett 368S, using the
existing 138 kV system. The proposed Empress area wind farms which are assumed to be
connected radially are not expected to require additional transmission since the Empress area is
a net load area supplied from two existing 240 kV lines.

Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area 240 kV
substation in an in-out arrangement will allow picking up the existing Taber wind farm without
additional 138 kV transmission lines. Conrad 135S load will be normally supplied from the new
240 kV source and will have a back up supply from Fincastle 336S for a 240 kV contingency.

Similarly, re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead
523S area 240 kV substation in an in-out arrangement will allow picking up Project 513 wind
farm, which is planned to be interconnected via 600L, without additional 138 kV transmission
lines. Peace Butte 404S load will be normally supplied from the new 240 kV source and will
have a back up supply from Bullshead 523S for a 240 kV contingency.




                             Alberta Electric System Operator
Draft for Discussion                            53                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The 240 kV reactor at the new Bullshead area substation is required to prevent overvoltages in
the 240 kV system when the new 240 kV lines are lightly loaded, for instance when the area
wind farms are not generating.




                             Alberta Electric System Operator
Draft for Discussion                            54                                June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.7                  Alternative Alt-B-5
3.7.1                Description
Alternative Alt-B-5 envisages a 240 kV development sourced out of West Brooks 28S and
terminating at new 240/138 kV transformation stations at or near Fincastle 336S and in the
Redcliff area North of the City of Medicine Hat. The 240 kV development utilizes twin 477 kcmil
conductors with a summer/winter capacity of approximately 600/744 MVA. In this alternative the
proposed wind farms in the respective area will be collected at the new substations which will
also be integrated with the existing 138 kV system to reinforce the load serving network. This
development is shown in Figure 3-4.

Figure 3-4:                   Part B transmission development: Alternative B-5



                                                               To Anderson 801S &                                                                                                       To Oyen
                                                           Sheerness Generating Station                                                                                                  767S
                                                                                 9L934/




                                                                                                                                                                                                  7L760/760L
                                                                     933L        9L950
                           N                    Brooks                          Ware Junction
                                                                                                                                     Wardlow
                                                                                                                                                                             Empress Liquids
                                                                                                                                                                                   164S
                                                                                   132S                                                                                                760AL
     To Langdon                                                                                                                       230S                                                                      Amoco
        102S                                            Bassano                                                                                                            Sandy Point   869                   Empress
                                                         435S                 931L                                                                                                           L
                                                                                                                                                                              204S                               163S
                                                                                     Duchess                                             Jenner                                           760L
                                                                                                                                                                               Empress
                                                                                                                    951L                  275S
                                                                                      339S                                                                                       394S     871L
                                                                                                                    944L                                     945L         Wind Farm
                                    To Queenstown                                        Cutting Lake                                                                                      Sand Hills 830L
                    927L                                          853L                                                                                                    Project 590
                                        504S                                                227S                                                                            99 MW            341S
                                             935L                             814L
                    924L                                                                                                                                                                                               9LS1M
                                                                                827L Brooks               Tilley                                                    Wind Farm                    McNeill
                                               923L
                                            Bow City
                                         Generating Plant
                                                                            W. Brooks
                                                                               28S
                                                                                      121S                498S                  Empress                             Project 617
                                                                                                                                                                     100 MW
                                                                                                                                                                                               Convertor
                                                                                                                                                                                                                      Sask Power
                                                                                                                                                                                                                    Interconnection
                                                                                                                                                                                              Station 840S
                                           2x525 MW                                                          100L
                                           (proposed)
                                                                                         795L




                                                      763AL                                                                  Suffield
                                                   Enchant                                                                    895S                      Chappice Lake               760L
                                                    447S                                                                                                    649S
                                                                     763L




                                                                                                                                            100L
                                                                                                                                           (892L)
                                                                                                   Hays
                                                                Vauxhall
                                                                                 821L              421S                                             Redcliff
                                                                 158S
                                  924L

                                         923L




                                                                                                                                                               Medicine Hat
                                                                                                                                                                  41S
                                                                                        Vauxhall                                                        172L (880L)
                                                                                                                                                      Bullshead                   Medicine
                                                Coaldale                                                                     172L                     N.O.
                                                                                                                                                        523S
        To Peigan
           59S
                     Monarch
                      492S
                                                 254S
                                                              172L
                                                                                172L
                                                                               (610L)
                                                                                                 172L
                                                                                                (612L)
                                                                                                          Burdett
                                                                                                           368S             (879L)           New
                                                                                                                                           Bullshead
                                                                                                                                                     600L                           Hat
                                                                  Taber                    Fincastle                       Wind Farm                       Wind Farm
                                                                   83S                                                     Project 534                     Project 513
                                                                                                               2L




                                                 820L                                        336S                            75 MW
                172L
                                                                                                                   72




 To Ft. Macleod                                                       New                      Taber Wind                                                   128 MW
                                                              Chin Chute
                                                                    Fincastle
       15S N. Lethbridge     734L
                                241S                         Wind 30MW                             Farm
                                                                                172AL




                                                                                                                                                                                           Wild Rose
                                                                                (607L)




                370S 207L                                                                                                                Seven Persons Peace Butte
                                 813L                   Chin Chute IPP
                                                                                                  80MW              Westfield              Wind Farm      404S                             Wind Farm
   To Peigan              111S    146S                                                                               107S
      59S      725L              823L                       11MW                        Wind Farm                                           120 MW                                          200 MW
                                L




                                 Lakeview
                            725A




             Lethbridge                                                                 Project 514
                                   593S                                          Conrad                                 Note: Line numbers in barckets denote new line numbers
                                                        66L




                674S                                                                     102 MW
                                                                                  135S
                                824L
                 Riverbend
                    618S          Lethbridge                                                                               138 kV                                   Thermal Plant
                                                                                                                           240 kV
                           863L




                                                     To
                                                                                                                                                                    Wind Farm
                                                   Stirling
                                                    67S                                                                    Planned
                                                                                                                                                                    Proposed Wind Farm
                       To
                     Magrath
                      225S

                                                                                                                        Transmission facilities in Part A
                               To
                       Great Falls, Montana                                                                             Transmission facilities in Part B
                         (merchant line)




                                                                     Alberta Electric System Operator
Draft for Discussion                                                                                                55                                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Substation Development

    • A new 240/138 kV transformation at or near Fincastle 336S complete with a
      240/320/400 MVA transformer;
   • A new 240/138 kV transformation substation in the Redcliff area complete with a
      240/320/400 MVA transformer and a 40 MVAr 240 kV reactor ;
Transmission Line Development

    •    A new double-circuit 240 kV line both sides strung from West Brooks 28S to the
         Vauxhall 158S area.
    •    A new 240 kV line double-circuit one side strung to extend one of the new circuits from
         West Brooks 28S to the new Fincastle 336S area 240 kV substation;
    •    A new 240 kV line double-circuit one side strung to extend the second circuit from West
         Brooks to the new Redcliff area 240 kV substation;
    •    A new 240 kV line double-circuit both sides strung from the new Redcliff area substation
         to Bullshead 523S. One circuit will be energized at 138 kV and will be terminated on
         600L Bullshead 523S to Peace Butte 404S near Bullshead 523S. The other circuit will
         be energized at 240 kV and will be connected to a customer-funded transmission line to
         interconnect the Wild Rose and possibly Seven Persons wind farms;
    •    Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
         substation in an in-out arrangement,
    •    A new 138 kV line from the new Fincastle 336S area substation to Taber 83S; and
    •    Termination of 100L Medicine Hat 41S to Suffield 895S and 760L Medicine Hat 41S to
         Chappice Lake 649S at the new Redcliff area substation in an in-out arrangement

The estimated cost of Alternative B-5 including associated substation upgrades is $230 million
(± 50%, 2007$). The estimated costs do not include the mitigation that may be required for the
underlying 138 kV.

3.7.2        Rationale for Alt-B-5
In this alternative, the new 240 kV substations that are established near Fincastle 336S and
Redcliff will interconnect wind farms in the respective area. The new 240 kV development is tied
to the 138 kV system at the stations to reinforce the load serving 138 kV system. Due to the
integration of the 240 kV development with the 138 kV network parallel flows will be present in
the 138 kV system and additional upgrades or reconfiguration of the 138 kV system may be
required.

The new lines from the new Redcliff area substation to the Bullshead area are required to
provide the same point of connection for the Bullshead area generators as the other alternatives
consistent with the assumed base case point of connection.

The 138 kV line from the new Fincastle area substation to Taber 83S and re-termination of 760L
at the new Redcliff area substation are considered to further strengthen the tie between the new
240 kV sources and the underlying 138 kV network and to prevent overloading of local 138 kV
lines.




                              Alberta Electric System Operator
Draft for Discussion                            56                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The 240 kV reactor at the new Redcliff area substation is required to prevent overvoltages in the
240 kV system when the new 240 kV lines are lightly loaded, for instance when the area wind
farms are not generating.




                             Alberta Electric System Operator
Draft for Discussion                            57                                June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.8                  Alternative Alt-B-6
3.8.1                Description
Alternative Alt-B-6 envisages a 240 kV development from West Brooks 28S and Empress which
would supply 240/138 kV transformation stations near Fincastle 336S and Redcliff as shown in
Figure 3-5. The 240 kV development utilizes twin 477 kcmil conductors with a summer/winter
capacity of approximately 600/744 MVA. In this alternative the proposed wind farms in the
respective area will be collected at the new substations which will also be integrated with the
existing 138 kV system to reinforce the 138 kV system.

Figure 3-5:                   Part B Transmission Development: Alternative B-6

                                                               To Anderson 801S &                                                                                                        To Oyen
                                                           Sheerness Generating Station                                                                                                   767S
                                                                                 9L934/




                                                                                                                                                                                                   7L760/760L
                                                                     933L        9L950
                           N                    Brooks                          Ware Junction                                        Wardlow
                                                                                                                                                                              Empress Liquids
                                                                                                                                                                                    164S
                                                                                   132S                                               230S                                              760AL
     To Langdon                                                                                                                                                                                                  Amoco
        102S                                            Bassano                                                                                                             Sandy Point   869                   Empress
                                                         435S                 931L                                                                                                            L
                                                                                                                                                                               204S                               163S
                                                                                     Duchess                                              Jenner                                           760L
                                                                                                                                                                                Empress
                                                                                                                     951L                  275S
                                                                                      339S                                                                                        394S     871L
                                                                                                                     944L                                     945L         Wind Farm
                                    To Queenstown                                        Cutting Lake                                                                                       Sand Hills 830L
                    927L                                          853L                                                                                                     Project 590
                                        504S                                                227S                                                                             99 MW            341S
                                             935L                             814L
                    924L                                                                                                                                                                                                9LS1M
                                                                                827L Brooks               Tilley                                                     Wind Farm                    McNeill
                                               923L
                                            Bow City
                                         Generating Plant
                                                                            W. Brooks
                                                                               28S
                                                                                      121S                498S                   Empress                             Project 617
                                                                                                                                                                      100 MW
                                                                                                                                                                                                Convertor
                                                                                                                                                                                                                       Sask Power
                                                                                                                                                                                                                     Interconnection
                                                                                                                                                                                               Station 840S
                                           2x525 MW                                                           100L
                                           (proposed)
                                                                                         795L




                                                      763AL                                                                   Suffield
                                                   Enchant                                                                     895S                      Chappice Lake               760L
                                                    447S                                                                                                     649S
                                                                     763L




                                                                                                                                             100L
                                                                                                                                            (892L)
                                                                                                   Hays
                                                                Vauxhall
                                                                                 821L              421S                                              Redcliff
                                                                 158S
                                  924L

                                         923L




                                                                                                                                                                Medicine Hat
                                                                                                                                                                   41S
                                                                                        Vauxhall                                                         172L (880L)
                                                                                                                                                       Bullshead                   Medicine
                                                Coaldale                                                                      172L                     N.O.
                                                                                                                                                         523S
        To Peigan
           59S
                     Monarch
                      492S
                                                 254S
                                                              172L
                                                                                172L
                                                                               (610L)
                                                                                                 172L
                                                                                                (612L)
                                                                                                          Burdett
                                                                                                           368S              (879L)           New
                                                                                                                                            Bullshead
                                                                                                                                                      600L                           Hat
                                                                  Taber                    Fincastle                        Wind Farm                       Wind Farm
                                                                   83S                                                      Project 534                     Project 513
                                                                                                               2L




                                                                      New                    336S
                172L                             820L                                                                         75 MW
                                                                                                                   72




 To Ft. Macleod                                                     Fincastle                  Taber Wind                                                    128 MW
                                                              Chin Chute
       15S N. Lethbridge     734L
                                241S                         Wind 30MW                             Farm
                                                                                172AL




                                                                                                                                                                                            Wild Rose
                                                                                (607L)




                370S 207L                                                                                                                 Seven Persons Peace Butte
                                 813L                   Chin Chute IPP
                                                                                                  80MW               Westfield              Wind Farm      404S                             Wind Farm
   To Peigan              111S    146S                                                                                107S
      59S      725L              823L                       11MW                                Wind Farm                                    120 MW                                          200 MW
                                L




                                 Lakeview
                            725A




             Lethbridge                                                                         Project 514
                                   593S                                          Conrad                             Note: Line numbers in barckets denote new line numbers
                                                        66L




                674S                                                                             102 MW
                                824L                                              135S
                 Riverbend
                    618S          Lethbridge                                                                                138 kV                                   Thermal Plant
                           863L




                                                     To                                                                     240 kV
                                                   Stirling                                                                                                          Wind Farm
                                                    67S                                                                     Planned
                       To                                                                                                                                            Proposed Wind Farm
                     Magrath
                      225S

                                                                                                                        Transmission facilities in Part A
                               To
                       Great Falls, Montana
                         (merchant line)                                                                                Transmission facilities in Part B




                                                                     Alberta Electric System Operator
Draft for Discussion                                                                                                58                                                                          June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Substation Development
   • A new 240/138 kV transformation at or near Fincastle 336S complete with a
      240/320/400 MVA transformer;
   • A new 240/138 kV transformation substation in the Redcliff area complete with a
      240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;
   • A new 240 kV switching station near Amoco Empress 163S;

Transmission Line Development
   • Termination of 945L at the new Empress area switching station in an in-out arrangement
   • A new double-circuit 240 kV line both sides strung from West Brooks 28S to the
      Vauxhall 158S area.
   • A new 240 kV line double-circuit one side strung to extend one of the new circuits from
      West Brooks 28S to the new Fincastle 336S area 240 kV substation;
   • A new 240 kV line double-circuit one side strung to extend the second circuit from West
      Brooks to the new Redcliff area substation;
   • A new 240 kV line double-circuit both sides strung from the new Redcliff area substation
      to Bullshead 523S area. One circuit will be energized at 138 kV and will be terminated
      on 600L Bullshead 523S to Peace Butte 404S near Bullshead 523S. The other circuit
      will be energized at 240 kV and will be connected to a customer-funded transmission
      line to interconnect the Wild Rose and possibly Seven Persons wind farms.
   • A new single-circuit 240 kV line from the new Redcliff station to the new Empress area
      station;
   • A new 138 kV line from the new Fincastle area substation to Taber 83S;
   • Termination of 100L Medicine Hat 41S to Suffield 895S and 760L Medicine Hat 41S to
      Chappice Lake 649S at the new Redcliff area substation in an in-out arrangement; and
   • Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
      substation in an in-out arrangement.

The estimated cost of Alternative B-6 including associated substation upgrades is $294 million
(± 50%, 2007$). The estimated costs do not include the mitigation that may be required for the
underlying 138 kV.

3.8.2        Rationale for Alt-B-6
In this alternative, the new 240 kV substations that are established at or near Fincastle 336S
and Redcliff will interconnect wind farms in the respective area. The new 240 kV development is
tied to the 138 kV system at the stations to reinforce the load serving 138 kV system. The new
240 kV line from Redcliff to the Empress area will provide additional capacity under normal and
contingency conditions compared to Alt B-5 which does not include the Redcliff to Empress line.

As in Alt-B-5, the new lines from the new Redcliff area substation to the Bullshead area are
required to provide the same point of connection for the Bullshead area generators as the other
alternatives consistent with the assumed base case point of connection.

The 138 kV line from the new Fincastle area substation to Taber 83S and re-termination of 760L
at the new Redcliff area substation are considered to further strengthen the tie between the new
240 kV sources and the underlying 138 kV network and to prevent overloading of local 138 kV
lines.


                             Alberta Electric System Operator
Draft for Discussion                            59                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The 240 kV reactor at the new Redcliff area substation is required to prevent over-voltages in
the 240 kV system when the new 240 kV lines are lightly loaded, for instance when the area
wind farms are not generating.

3.9          Performance evaluation of alternatives
3.9.1        Study scenarios for power flow analysis
The performance of the system with each of the Part B Alternatives in place and selected
elements removed from service was analyzed for the 2012 study period. The analysis is
performed assuming the developments identified in Part A are in place.

The worst case system operating scenarios from the list in Table 2.5-1 of the Revised Need
Assessment and Alternative Screening Document were selected for the analysis. Table 1-1
provides a description of the system operating scenarios studied.

Table 3-2:            Base case study scenarios




                                                                                   Saskatchewan
                                                       Medicine Hat

                                                       interchange




                                                                                    interchange
                           Study years




                                                                      generation
                                                                      SE Alberta




                                                                                     Alberta to
                                           Area load
               Scenario




                                                          City of




                                                                        wind
                                                            net




                                         summer        50 MW net                   150 MW
               3b         2012                                        922 MW
                                         minimum       generation                   export

                                         summer        50 MW net                   150 MW
               4b         2012                                        922 MW
                                         minimum       generation                   import



3.9.2        Results of power flow analysis
Table 3-3 provides a summary of the power flow study results for each of the five alternatives. A
detailed list of the contingencies studied along with a brief description of the resulting system
performance and drawings showing detailed study results are included in Appendix H.




                                         Alberta Electric System Operator
Draft for Discussion                                          60                                  June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table 3-3:        Summary of power flow study results for Part B alternatives
  Alternative      Scenario 3b                               Scenario 4b

  B-2a                                                       760L Amoco Empress 163S to Empress
                                                             Liquids Junction is overloaded (Category B)
  B-2b
  B-3b
  B-4
  B-3a             One of the new 240 kV circuits            One of the new 240 kV circuits between West
                   between West Brooks 28S and the           Brooks 28S and the new Fincastle area
                   new Fincastle area substation is fully    substation is fully loaded when the other circuit
                   loaded when the other circuit is out of   is out of service (Category B)
                   service (Category B)
                                                             760L Amoco Empress 163S to Empress
                                                             Liquids Junction is overloaded (Category B)
  B-5              760L Redcliff (new) to Empress 394S       760L Amoco Empress 163S to Empress
                   is overloaded (Category A&B)              Liquids Junction is overloaded (Category B)
                   Outage of the new West Brooks 28S         100L Redcliff (new) to Suffield 895S is
                   to Redcliff (new) 240 kV line causes      overloaded (Category B)
                   severe overloading in a large part of
                                                             Outage of the new West Brooks 28S to Redcliff
                   the 138 kV system
                                                             (new) 240 kV line causes severe overloading in
                   172L RP 534 junction to Burdett 368S      a large part of the 138 kV system
                   is overloaded (Category B)
                                                             172L RP 534 junction to Burdett 368S is
                                                             overloaded (Category B)
  B-6              760L Redcliff (new) to Empress 394S       760L Amoco Empress 163S to Empress
                   is overloaded (Category B)                Liquids Junction is overloaded (Category B)
                   172L RP 534 junction to Burdett 368S      7L760 Empress Liquids Junction to Oyen 767S
                   is overloaded (Category B)                is overloaded (Category B)
                                                             100L Redcliff (new) to Suffield 895S is
                                                             overloaded (Category B)
                                                             172L RP 534 junction to Burdett 368S is
                                                             overloaded (Category B)




                                 Alberta Electric System Operator
Draft for Discussion                                  61                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


In addition to the overloads identified in Table 3-3, overloading of 853L West Brooks 28S to
Queenstown 504S was identified. As generation in southern Alberta increases, transfers from
the region to the load center in the Calgary area increase. Analysis of this condition will be
conducted as a part of the future southern Alberta area planning study.

The overloading of 760L/7L760 will be further analysed within the Hanna area regional
transmission development study as indicated within the AESO 10-Year plan dated February
2007.

The results of the power flow analysis indicate that Alternatives B-2a, B-2b, B-3b and B-4 have
similar performance. These alternatives have the best performance in terms of thermal
overloads in the southeast system as shown in the preceding section.

In Alternative B-3a, one of the new 240 kV circuits between West Brooks 28S and the new
Fincastle area substation is fully loaded when the other circuit is out of service. As a result, this
alternative provides no room for further generation development in excess of that considered in
the study.

While Alternative B-5 has the worst performance, both Alternatives B-5 and B-6 result in
overloads in the 138 kV system that are not present in the other alternatives.

3.10          Comparison of Part B alternatives
3.10.1        Comparison of technical performance
Table 3-4 provides comparison of the Part B alternatives based on technical considerations.

Table 3-4:        Technical comparison of Part B alternatives
                       Alt B-2a     Alt B-2b   Alt B-3a   AltB-3b   Alt B-4   Alt B-5     Alt B-6


Overloading of the     No           No         No         No        No        Yes         Yes
138 kV system


Adds capacity to       No           Non        No         No        Medium    High        Higher
the load serving
system

Suitability of line    No           Yes        No         Yes       Yes       Yes         Yes
conductor to
support further
generation
development
Customer               Same as      Same       Same as    Same      Same      Same        Same
interconnection        base         as base    base       as base   as base   as base     as base
requirements           case         case       case       case      case      case        case




                                  Alberta Electric System Operator
Draft for Discussion                                62                                  June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.10.2   Financial comparison
3.10.2.1 Capital cost
Table 3-5 provides an estimated cost (±50%, 2007$) of each of the alternatives for the Part B
Development. The capital costs for each alternative are +/- 50% estimates developed by the
AESO. These capital estimates include the cost of design, construction, land and regulatory
applications but exclude AFUDC. Note that the estimated costs for Alternatives B-5 and B-6 do
not include the mitigation that may be required to address parallel flows on the underlying 138
kV system.

Table 3-5:        Cost of Part B alternatives

                       Alt B-2a      Alt B-2b      Alt B-3a      AltB-3b      Alt B-4     Alt B-5     Alt B-6


     Cost (±50%,
                           186            197        196           219         208          230        294
       2007$)




3.10.2.2 Comparative transmission losses
System losses are estimated for each alternative to determine the relative efficiency of the
alternatives with regard to transmission losses. Table 3-6 provides relative annual system
losses with Alternative B-2a as the reference. The values are calculated using a production
model which calculates annual losses on an hourly basis utilizing forecast hourly system load
and the generator stacking order to dispatch non-wind generators. Wind generators were
modeled as variable negative loads based on historical hourly production from existing wind
farms.

Table 3-6:        Comparative system losses
     Losses
        (1)(2)    Alt-B-2a       Alt-B-2b       Alt-B-3a   Alt-B-3b        Alt-B-4      Alt-B-5      Alt-B-6

     Average
                       0          -0.56          1.16           0.24        -0.95        -2.78        -3.23
       MW
      Annual
                       0          -4,876        10,120        2,082        -8,341       -24,340      -28,256
       MWh

(1) Alternative B-2a is used as the reference for comparison
(2) Negative values indicate lower system losses compared to the reference case



3.10.2.3 Financial evaluation
The financial evaluation of the alternatives uses a discounted cash-flow model. This model
calculates the present value (PV) of the revenue requirement and the PV of the loss savings
(costs) relative to base case (Alternative B-2a).

The revenue requirement is calculated to estimate the costs that the TFO will recover each year
from the construction and operation of the proposed transmission facilities. The revenue
requirement is based on depreciation, the cost of debt, the return on equity, income taxes, and
ongoing operation and maintenance costs.


                                    Alberta Electric System Operator
Draft for Discussion                                       63                                       June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


A summary of the capital costs, the PV of the revenue requirement and PV of losses are
provided in Table 3-7. The table also provides the net present value (NPV) of each alternative
and a ranking of the alternatives based on the net present value.

The financial evaluation assumes losses will remain static for the twenty year evaluation period.
The losses are evaluated based on a forecast of pool prices purchased from EDC Associates
Ltd. The value of the losses are calculated in relationship to Alternative B-2a.

Table 3-7:          Summary of financial evaluation results
                                                                                Ranking
                         Capital
                                                        PV Loss
                         Cost (=/-    PV Revenue
    Alternative                                         Savings      NPV          (#1 =
                          50%)        Requirement
                                                        (costs)                  lowest
                         (2007$)
                                                                                  NPV)

       Alt-B-2a          $183,429       $188,195          $0       $188,195         1

       Alt-B-2b          $194,277       $197,448        -$3,311    $194,137         2

       Alt-B-3a          $193,290       $198,313        $6,858     $205,170         4

       Alt-B-3b          $215,972       $221,584        $1,419     $223,003         6

        Alt-B-4          $205,124       $210,454        -$5,616    $204,838         3

       Alt-B-5(1)        $226,820       $232,714        -$16,435   $216,279         5

       Alt-B-6(1)        $289,936       $297,469        -$19,095   $278,374         7

(1) Note that the estimated costs for Alternatives B-5 and B-6 do not include the mitigation that
may be required to address parallel flows on the underlying 138 kV system.




                                Alberta Electric System Operator
Draft for Discussion                               64                             June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.10.3       Preliminary siting assessment
AltaLink was engaged by the AESO to perform a preliminary siting assessment for the
developments being considered for the Southeast. The Assessment included flying the project
sites in a helicopter and analysis of aerial photography. Following is a summary of the
preliminary assessment of siting assessments for the Part B alternatives.

240 kV line from West Brooks 28S to a new substation in the Fincastle 336S area

A high level assessment of the planning area for a 240 kV transmission line between West
Brooks 28S to the Fincastle 336S area, approximately 110 km in length, identified the following
potential conditions:

    •    Possibility to parallel the high way and road allowance;
    •    river crossings required;
    •    wetlands to the south of Brooks;
    •    native grasslands, farms and rural acreages in the Vauxhall area;
    •    significant congestion of residences and pivots to the northeast, east and southeast of
         Vauxhall
    •    irrigated lands in the Fincastle area;
    •    irrigation pivots;
    •    construction would likely be required in winter as there are potential environmental
         constraints that may impact construction; and
    •    environmental studies would be required at least one year prior to construction with the
         potential for Burrowing Owls, ground nesting species and waterfowl in the study area.

240 kV line from Vauxhall Area to the Bullshead 523S Area

A high level assessment of the planning area for a 240 kV transmission line between Vauxhall
area to the Bullshead area, approximately 130 km in length, identified the following potential
conditions:

    •    located through irrigated farm land;
    •    significant amounts of native grassland;
    •    river crossings required;
    •    lakes or reservoirs within the study area;
    •    between Vauxhall and Hays may require many angle structures and mitigation
         requirements;
    •    native grasslands,
    •    irrigation pivots;
    •    construction would likely be required in winter as there are potential environmental
         constraints that may impact construction; and
    •    environmental studies would be required at least one year prior to construction with the
         potential for Burrowing Owls, ground nesting species and waterfowl in the study area.




                              Alberta Electric System Operator
Draft for Discussion                            65                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


240 kV line from a new substation in the Fincastle 336S area to the Bullshead 523S Area

A high level assessment of the planning area for a 240 kV transmission line between a new
substation in the Fincastle 336S area to the Bullshead 523S Area, approximately 122 km in
length, identified the following potential conditions:

    •    located predominantly through irrigated farm land;
    •    some native grasslands;
    •    one river crossing required;
    •    reservoirs within the study area;
    •    large concentration of irrigation pivots;
    •    construction would likely be required in winter as there are potential environmental
         constraints that may impact construction; and
    •    environmental studies would be required at least one year prior to construction with the
         potential for Burrowing Owls, ground nesting species and waterfowl in the study area.

240 kV line from a new substation in the Redcliff area to the Empress Area

A high level assessment of the planning area for a 240 kV transmission line between a new
substation in the Redcliff area to the Empress Area, approximately 100 km in length, identified
the following potential conditions:

    •    located through cultivated lands mostly on the north end of the project area;
    •    a large portion of native and grazing grass lands;
    •    one river crossing required;
    •    a lake within the study area;
    •    construction would likely be required in winter as there are potential environmental
         constraints that may impact construction; and
    •    environmental studies would be required at least one year prior to construction with the
         potential for Burrowing Owls, ground nesting species and waterfowl in the study area.

The high level siting assessment has identified potential siting conditions for all of the Part B
regional transmission development alternatives considered. At this time, the AESO is not
seeking approval of the Part B regional transmission development. Subject to the Market and
Operational Framework for wind integration, the AESO will be initiating a parallel process to
lead up to a concurrent Need and Facility application (new framework option as per new
Transmission Regulation) for the Part B regional transmission development. Through the
Facility process, detailed siting assessment will be conducted.




                              Alberta Electric System Operator
Draft for Discussion                            66                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


3.11         Summary of recommended Part B development
The first type of alternative identified in Section 3.0, involving the dedicated transformation
terminals, is recommended for the transmission development for Part B. This is mainly due to
the lower initial capital cost and the fact that the 138 kV system with the Part A developments in
place is adequate to support forecast load within the 10 year planning horizon unless major
changes in the system such as substantial increase in the City of Medicine Hat Demand
Transmission Service (DTS) occur. In the longer term, further reinforcement of the 138 kV
system is likely to be required to support load growth. At such time, the Part B 240 kV
development coupled with some reconfiguration of the 138 kV network to provide additional load
serving capability will be examined.

The preferred alternative envisages a 240 kV development sourced from West Brooks 28S
terminating at two (2) new 240 kV wind generation collector stations; one in the vicinity of
Fincastle 336S and another in the vicinity Bullshead 523S, to serve generation developments in
the respective area. Alternatives B-2 and B-3, illustrated in Figure 3-6, which address the
requirements of Part B, are electrically similar and have the lowest estimated cost. The
difference between these two alternatives relates primarily to the siting of the transmission line
to the collector station in the Bullshead area from the 240 kV line source from West Brooks 28S
to the Fincastle area collector station. The location of the transmission lines will be further
analyzed in the Need Identification development and more specifically in the AltaLink Facility
Application process.

Alternative B-2b and Alternative B-3b provide an additional 240 MVA per circuit over Alternative
B-2a which utilizes twin 477 kcmil conductor, due to the twin 795 kcmil conductor used for the
double circuit portion of 240 kV development. The additional transfer capability would provide
for increased generation development within the southeast area.

Figure 3-6:       Part B development




                             Alberta Electric System Operator
Draft for Discussion                            67                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


                                                 To Anderson 801S &                                                                                                      To Oyen
                                             Sheerness Generating Station                                                                                                 767S
                                                                    9L934/




                                                                                                                                                                                   7L760/760L
                                                         933L       9L950
               N                    Brooks                         Ware Junction                                         Wardlow
                                                                                                                                                              Empress Liquids
                                                                                                                                                                    164S
                                                                      132S                                                230S                                          760AL                    Amoco
                                           Bassano                                                                                                          Sandy Point   869                   Empress
                                            435S                  931L                                                                                                        L
                                                                                                                                                               204S                               163S
                                                                         Duchess                                              Jenner                                       760L
                                                                                                                                                                Empress
                                                                                                         951L                  275S
                                                                          339S                                                                                    394S     871L
                                                                                                         944L                               945L           Wind Farm
                         To Queenstown                                      Cutting Lake                                                                                   Sand Hills 830L
                                                    853L                                                                                                   Project 590
                             504S                                              227S                                                                                          341S
                                                                  814L                                                                                       99 MW
                                  935L
                                                                  827
                                                                                              Tilley                                                 Wind Farm                   McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                   L
                                                             W. Brooks
                                                                28S
                                                                       Brooks
                                                                        121S                  498S                   Empress                         Project 617
                                                                                                                                                      100 MW
                                                                                                                                                                               Convertor
                                                                                                                                                                              Station 840S
                               2x525 MW                                                           100L
                               (proposed)
                                           763A


                                                                            795L
                                             L                                                                    Suffield
                                   Enchant                                                                         895S                  Chappice Lake              760L
                                     447S                                                                                                    649S
                                                          763L




                                                                                                                                 100L
                                                                                      Alternative B-2                           (892L)
                                                                                       Hays
                                                  Vauxhall        821L                 421S
                                                   158S
                      924L

                             923L




                                                                                                                                                 Medicine Hat

                                                                            Vauxhall                                                                41S


                                                                                                                 172L
                                                                                                                                           172L (880L)
                                                                                                                                           Bullshead
                                                                                                                                                                   Medicine
                                Coaldale                           172L             172L Burdett
         Monarch
          492S
                                 254S
                                                 172L
                                                                  (610L)           (612L) 368S                  (879L)
                                                                                                                                   New
                                                                                                                                             523S
                                                                                                                                          N.O.


                                                                                                                                           600L
                                                                                                                                                                     Hat
                                                        Taber                                                   Wind Farm        Bullshead
                                                                            N.O.                                                                Wind Farm
                                                                                                                Project 534
                                                                                                     2L




                                                         83S New                                                                                Project 513
      172L                          820L                                                                          75 MW
                                                                                                   72




                                                           Fincastle
                                                    Chin Chute                       Taber Wind                                                  128 MW
  N. Lethbridge       L
                   734241S                                                              Farm
                                                                   (607L)
                                                                   172AL




                                                    Wind 30MW                                                                 Seven Persons Peace Butte                    Wild Rose
      370S 207L
                       813L                      Chin Chute
                                                                                       80MW              Westfield             Wind Farm       404S                        Wind Farm
                111S 146S                                                                                 107S
     725L              823L                      IPP 11MW                           Wind Farm                                    120 MW                                     200 MW
                                                                                                  Alternative B-3
                  L




                       Lakeview
                  725A




   Lethbridge                                                                       Project 514
                         593S                                        Conrad
                                           66L




      674S                                                                           102 MW
                      824L                                            135S                               Note: Line numbers in barckets denote new line numbers
       Riverbend
        618S          Lethbridge
                                                                                                                138 kV
               863L




                                       To                                                                                                            Thermal Plant
                                     Stirling
                                      67S                                                                       240 kV
                                                                                                                                                     Wind Farm
            To                                                                                                  Planned
          Magrath                                                                                                                                    Proposed Wind Farm
           225S


                   To                                                                                      Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)                                                                               Transmission facilities in Part B




                                                                 Alberta Electric System Operator
Draft for Discussion                                                                                   68                                                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


The following provides details of the transmission development anticipated for the second phase
(Part B):

Substation Developments
    •    A new wind farm collector transformation station at or near Fincastle 336S complete with
         a 240/320/400 MVA transformer;
    •    A new wind farm collector transformation station at or near Bullshead 523S complete
         with a 240/320/400 MVA transformer and a 40 MVAr 240 kV reactor;

Transmission Line Developments
    •   Re-termination of 607L Fincastle 336S to Conrad 135S at the new Fincastle 336S area
        substation in an in-out arrangement, and
    • Re-termination of 600L Bullshead 523S to Peace Butte 404S at the new Bullshead 523S
        area substation in an in-out arrangement.
    Alternative B-2
    • A new double-circuit 240 kV line both sides strung, from West Brooks 28S to the
        Vauxhall 158S area utilizing twin 795 kcmil conductors;
    • A new double- circuit 240 kV line one side strung to extend one of the new circuits from
        West Brooks 28S to the new Fincastle 336S area 240 kV substation. The line will utilize
        twin 477 kcmil conductors;
    • A new 240 kV line double-circuit one side strung, approximately 127 km, to extend the
        second circuit from West Brooks to the new Bullshead 523S area substation. The line
        will utilize twin 477 kcmil conductors;
    Alternative B-3
    • A new double-circuit 240 kV line both sides strung, from West Brooks 28S to the
        Fincastle 336S area 240 kV substation utilizing twin 795 kcmil conductors;
    • A new 240 kV line double-circuit one side strung, to extend from the Fincastle 336S area
        240 kV substation to the Bullshead 523S area240 kV substation. The line will utilize twin
        477 kcmil conductors;

These developments have an estimated cost $197 to 219 million (±50%, 2007). The entire
amount is deemed a system cost by the AESO.

The anticipated in-service date for the facilities required in the Part B development, subject to
the Market and Operational Framework, is in the 2010 to 2012 time frame.

The second phase (Part B) will include the transmission development required to interconnect
the potential wind generation identified in the southeast Alberta, subject to the requirements to
be established in the Market and Operational Framework. At this time, the AESO is not seeking
approval of the Part B regional transmission development. The AESO will launch a parallel
process to preface a concurrent need and facility application, as per a new framework option
identified in the Revised Transmission Regulation released in April 2007, for the Part B regional
transmission development.




                              Alberta Electric System Operator
Draft for Discussion                            69                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            70                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


4.0          Conclusion
The detailed assessment has been conducted on both phases (Part A and Part B) to ensure the
transmission system reinforcement identified for Part A would be consistent with the later larger
build of Part B. The leading options for Part B are consistent with the Part A transmission
development, so the Part A development can proceed immediately. In addition, the two leading
Part B alternatives are expected to be heavily influenced by local siting issues rather than
technical differences between the alternatives.

Therefore the AESO will:
    •    seek approval for Part A regional transmission development now;
    •    launch a parallel process to develop a concurrent need and facility application, as a new
         framework option identified in the Revised Transmission Regulation released in April
         2007.

This will:
    •    allow the AESO to address the requirements of Part A on a timely basis;
    •    allow work to proceed expeditiously on facility application for Part B; and
    •    enable the Part B regional transmission development Need process and
         recommendation to be made concurrently with the Facility process and
         recommendation, enabling the results of the detailed siting work to be considered in the
         selection of the Part B recommended alternative.




                              Alberta Electric System Operator
Draft for Discussion                            71                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            72                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix A:            Proposed Part A Development




                             Alberta Electric System Operator
Draft for Discussion                           A-1                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           A-2                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure A-1:                  Proposed Part A development



                                                  To Anderson 801S &                                                                                                  To Oyen
                                               Sheerness Generating Station                                                                                            767S
                                                                       9L934/




                                                                                                                                                                                 7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                             Empress Liquids
                                                                                                                                                                   164S
                                                                         132S                                                                                          760AL
                                                                                                                              230S                                                             Amoco
                                            Bassano                                                                                                        Sandy Point   869                  Empress
                                             435S                   931L                                                                                                     L
                                                                                                                                                              204S                              163S
                                                                            Duchess                                             Jenner                                    760L
                                                                                                                                                               Empress
                                                                                                            951L                 275S
                                                                             339S                                                                                394S     871L
                                                                                                            944L                            945L
                          To Queenstown                                        Cutting Lake                                                                               Sand Hills 830L
                              504S                   853L                         227S                                                                                      341S
                                   935L                             814L
                                                                      827L Brooks                Tilley                                                                         McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                                               Convertor
                                                                                                                                                                             Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                                                               795L




                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                 Chappice Lake           760L
                                        447S                                                                                                   649S
                                                           763L




                                                                                                                                   100L
                                                                                                                                  (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                              Medicine Hat

                                                                               Vauxhall                                                          41S


                                                                                                                    172L
                                                                                                                                            172L (880L)
                                                                                                                                            Bullshead
                                                                                                                                                               Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                  (879L)                     523S
                                                                                                                                            600L
                                                                                                                                                                 Hat
                                                         Taber                                                                                   Wind Farm
                                                                                                        2L




                                                          83S                                                                                    Project 513
      172L                           820L
                                                                                                      72




                                      Chin Chute                                        Taber Wind                                                 31 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      172AL
                                                                      (607L)




                      241S           Wind 30MW                                                                                                Peace Butte
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield                            404S
                111S    146S                                                                                 107S
     725L              823L         11MW
                      L




                       Lakeview
                  725A




   Lethbridge
                         593S                                           Conrad
                                            66L




      674S                                                                                            Note: Line numbers in barckets denote new line numbers
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                                   138 kV                          Thermal Plant
               863L




                                         To
                                                                                                                   240 kV
                                       Stirling                                                                                                    Wind Farm
                                        67S                                                                        Planned
            To                                                                                                                                     Proposed Wind Farm
          Magrath                                                                                                  New
           225S


                   To
                                                                                                              Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                      A-3                                                       June 6, 2007
                                        Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



     LEGEND:
                                                                      Faulting Switch                            Transformer                              Fuse                                   Underground Cable
                          Substation Fence


                           Motorized Air Break                        Circuit Breaker                            Generation                               Disconnect Switch


                           AutoTransformer                            Capacitor Bank                               Motorized air break                     Proposed Development
                                                                                                                   with arcing horn



                                                                                                                                                    770L 138kV
                                                                                                                                                 to Coaldale 254S
                                                                                                                                                                        1                NOTES:

                                                                                                         734L 138kV                                                                      1. Existing 770L is re-routed back
   172L 138kV to                                                                                       to Uplands 241S
   Colddale 254S                                                                                                                                                                            to the northern 138kV Bus 2
                                                                                                     (City of Lethbridge)                                                                2. New 734L circuit terminated
                                                                                                                                                                                            bay left spare by 770L.


                                                                                                                                                                         To 25kV Bus
                                  138kV Bus 2                                                                                                       T4
                                                                                                                                               130/24.94 kV
                                                                                                                                             15/20/25/28 MVA
                                                                                                                                                                         New Line to
                                                                                                                                                                        Macdonald 146S
                                                                                                                                                                    2




                                                          138kV U/G
                                                                                                                                                    T1
                                                                                                                                               130/24.94 kV
                                           T4
                                                                                                                               138kV Bus 1
         T5                                                                                                                                   25/33/41 MVA
                                       245/144 kV                                       T3                                                                              To 25kV Bus
     245/144 kV
                                    120/160/200 MVA                                 245/144 kV
  120/160/200 MVA
                                                                               120/160/200/224 MVA




                                                                               240kV Bus 1




                    240kV Bus 2
                                                                               924/935L 240kV
                                                                               to Milo Junction

                                                                                                         172L 138kV
                                                                                                      to Ft Macleod 15S                                                       Proposed North Lethbridge 370S
                                                                                                                           207L 138kV                                                  Development
                                   923/927L 240kV      967L 240kV                                                       to Lethbridge 111S
                                   to Milo Junction   to 59S Peigan                                                    (City of Lethbridge)

                                                                                                                                                                                       Figure A-2


                                                                                             Alberta Electric System Operator
Draft for Discussion                                                                                              A-4                                                                        June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                                                                                         New circuit to
                                                                                                                 North Lethbridge 370S


                                                                            T1
                                                                        138/13.8 kV
                                                                       18/24/30 MVA

                                                                                                                  813L to Uplands 241S




                                       13.8 kV Bus
                                                                                             138 kV Bus
                                                                            T2
                                                                        138/13.8 kV
                                                                       18/24/30 MVA

                                                                                                                  823L to Lakeview 593S




   LEGEND:
                                                                                        Faulting Switch
             Proposed Development                    Vacuum Breaker

                                                                                        Motorized Disconnect
                                                     Regulator
              OCTC Transformer
                                                                                       Manual Disconnect             Proposed Macdonald 146S Development

              LTC Transformer                        Circuit Breaker
                                                                                       Single Phase Disconnect
                                                                                                                                          Figure A-3

                                                            Alberta Electric System Operator
Draft for Discussion                                                                  A-5                                                     June 6, 2007
                                    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




   LEGEND:
                                                            Faulting Switch                               Transformer                                   Fuse                                Regulator
                      Substation Fence


                      Motorized Air Break                 Circuit Breaker                                 Generation                                    Disconnect Switch                    Transfer Switch

                      AutoTransformer                     Capacitor Bank                                       Motorized air break                      Underground                          Proposed Development
                                                                                                               with arcing horn


                                                                                             763L to 853L to             814L to                     933L to                931L to
                                                                                                                                                   801S (ATCO)               132S
                                                                                              158S 504S                   121S


                                                                                     138kV                                                                                                    240kV


                                                                                                                                            T1
                                                                                                                                        245/144 kV
            T3
                                                                                                                                     240/320/400 MVA                                                                   R1
        138/24.9kV
       15/20/25 MVA                                                                                                                                                                                                 50MVAr 3φ




                              VR3
                             24.9kV
                          15/20/25 MVA
                                                                                                                                             T2
                                                                                                                                         245/144 kV
           25kV                                                                                                                       240/320/400 MVA
                                             Standby
                                            AC Supply                                138kV                                                                                        240kV

                                                    AC Station
                                                     Service


          2057L   2056L       2255L                                                                                                                                                          923L to
                                                                                                     827L to                                                             935L to
                                                                              New line to                                                                             Milo Junction       Milo Junction
                                                                                                      121S
                                                                                121S




                                                                                                                                                                                Proposed West Brooks 28S
                                                                                                                                                                                      Development

                                                                                                                                                                                               Figure A-4

                                                                              Alberta Electric System Operator
Draft for Discussion                                                                                            A-6                                                                                June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




   LEGEND:
                                               Faulting Switch                                Transformer                       Fuse                                Arrester
                  Substation Fence


                  Motorized Air Break          Circuit Breaker                                Generation                        Disconnect Switch                      Underground Cable


                  AutoTransformer              Capacitor Bank                                  Motorized air break              Proposed Development                     Salvage
                                                                                               with arcing horn




                  831L 138kV                                                  100L 138kV
                to Duchess 339S                                              to Tilley 498S




                83L
                                                                                                                                                         2130L




                                                                      T5
                                                                 130/24.94 kV
                                                                                                                                                        23L




                                                                25/33/41 MVA
               814L 138kV to
               West Brooks 28S
                                                                                                                                                         257L




                                                                                                                     25kV Bus




                                                                       2Ω
                                                                                                                                                         67L




                                                                   T2
                                                              130/24.94 kV
                                                                                                                                                         2233L




                                                             25/33/41 MVA
              827L 138kV to
              West Brooks 28S




                                                                       2Ω
                                                                              795L 138kV
                                                                             to Hays 421S




                                                 138kV Bus
                                                                                                                                                       Proposed Brooks 121S
                                                                                                                                                           Development


                                                                                                                                                                 Figure A-5

                                                                  Alberta Electric System Operator
Draft for Discussion                                                                           A-7                                                                  June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                                                            VR1
                                                                                          24.94 kV
                                                                                        15/20/25 MVA

                                                                           T1
                                    27 MVAR                           138/24.94 kV
                                                                    15/20/25//28 MVA

                                                                                                                                    257LE




                                                                                       257LW
                            138 kV to


                                                                                                            25 kV Bus
                         Brooks 121S




                                                       138 kV Bus
                                                                            T2                                   N.O.
                                                                       138/24.94 kV
                                                                       15/20/25 MVA

                       100L – 138 kV to
                                                                                                                                    New 2273L
                          Suffield 895S




                                                                                                                        NOTE:

                                                                                                                         The proposed layout assumes the
   LEGEND:                                                                                                               additions and rearrangements proposed
                                                                                  Faulting Switch                        for the substation as part of the
             Proposed Development                  System Salvage                                                        committed Fortis project (RP-05-637)
                                                                                                                         are in place
                                                                                  Motorized Disconnect
                                                 Regulator
              OCTC Transformer
                                                                                  Manual Disconnect                     Proposed Tilley 498S Development

              LTC Transformer                    Circuit Breaker
                                                                                  Single Phase Disconnect
                                                                                                                                     Figure A-6

                                                          Alberta Electric System Operator
Draft for Discussion                                                            A-8                                                         June 6, 2007
                                          Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



    LEGEND:
                                                                                                     Transformer                              Fuse                                                                            Current transformer
                         Substation Fence                         Proposed Development



                         Motorized Air Break                      Circuit Breaker                    Generation                               Manual Air Break


                         AutoTransformer                          Capacitor Bank                      Motorized air break                          Underground Cable
                                                                                                      with arcing horn


                                                                                              138kV Underground Cable



                                                                                                      3
    951L to
  Ware Junction
                                                                                                                                                                                                                                               760L to Oyen




                                                                                                                                                                            830L to McNeil
                                                                                                                                                                                             760L to Empress




                                                                                                                                               871L to Sand Hills
                                                                                                                                                                                                                      869L to Sandy Point




      New Tx                                                                 240kV Ring Bus
    240/138kV
                            2
 120/160/200 MVA


    945L
  to Jenner
                                                                                                                                 New Tx
                                                                                                                               240/138kV
                                                                                                                            120/160/200 MVA

                                1

                                                        T2                                                                                                                                                                                                                    3φ
                                                                                                                                                                    138kV
                                                     240/13.8                                          T1                                                                                                                                                                 4
                                                                                                                                         6                                                                     5
                                                 90/120/150 MVA                                     240/13.8
                                    20Ω                20Ω                                         90/120/150
                                                                                                   20Ω                       20Ω


                                                                                                                                                                      C1                                                               C2
                                                                                                                                                                                                                                                              26.9 MVAR




                                                                                                                                                                                                 26.9 MVAR




              NOTES:
              1. Extension of Eastern 240kV High Bus and turn corner on 240kV Low Bus. Addition of 240kV Air Break and
                 Circuit Breaker
              2. From LV Bushing into 138kV Circuit Breaker into drop down towers into cable tray.
                                                                                                                                                                                                  Proposed
              3. Cables in tray above grounding grid. Tray needs to withstand weight of transformer removal. 4 cables are to                                                            Amoco Empress 163S Development
                 be included terminated at each end.
              4. Terminate 4 Cables, through Current Transformer, Manual Air Break onto northern end of 138kV Bus
              5. 138kV Bus Tie Breaker on transportable skids, completion of 2 pedestal air break support for additional 138kV
                 Air Break, upgrade existing 138kV manual air break to accommodate 1800A bus current.                                                                                                              Figure A-7
              6. Replace 240/138kV 200MVA with 240/138kV 400MVA unit as well as motorized air break.



                                                                                    Alberta Electric System Operator
Draft for Discussion                                                                                      A-9                                                                                                                               June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



   LEGEND:
                                                        Transformer                          Fuse
                 Substation Fence                                                                                                  Manual Air Break
                                                                                                                                                                          Arrester


                 Motorized Air Break                 Circuit Breaker                         Generation                                Underground Cable


                 AutoTransformer                     Capacitor Bank                           Motorized air break                  Proposed Development
                                                                                              with arcing horn




                         Amoco
                         Empress
                          163S

                                                                                                                                         ATCO Electric     5L128L      11113T          426L     Fortis Alberta
                                                                                                                                         AltaLink                                               AltaLink




                                                       To                       T4
                                                                           130/13.8 kV
                                                       Customer                                                                                                 N.O.            N.O.          N.O.
                                                                          30/40/50 MVA




                                              869L
                                                                                                                              T2




                                                                                                                138kV




                                                                                       20Ω
                                                                                                                         132/23.9 kV
                                                                                                                         7.5/10 MVA                            25kV Bus
                                                                  760L – 138kV                                                              N.O.
                                                                  to Medicine Hat


                                                                                                                                                    U/G

                                                                  760L – 138kV to
                                                                 Amoco Empress 163S


                                                                                                                              T1
                                                                                                                         132/24.9 kV                                    427L
                                                                                                                        15//16.8 MVA
                                                                              T3
                                                      To                 130/13.8 kV




                                       869L
                                       869L
                                                      Customer          30/40/50 MVA
                                                                                       20Ω




                         Sandy                                                                                                                             Existing Empress 394S
                         Point
                         204S


                                                                                                                                                               Figure A-8a

                                                                       Alberta Electric System Operator
Draft for Discussion                                                                          A-10                                                                      June 6, 2007
                                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



    LEGEND:
                                                                              Transformer                          Fuse
                                Substation Fence                                                                                                         Manual Air Break
                                                                                                                                                                                                Arrester


                                Motorized Air Break                        Circuit Breaker                         Generation                                Underground Cable


                                AutoTransformer                            Capacitor Bank                           Motorized air break                  Proposed Development
                                                                                                                    with arcing horn




                                        Amoco
                                        Empress
                                         163S

                                                                                                                                                               ATCO Electric     5L128L      11113T          426L     Fortis Alberta
                                                                                                                                                               AltaLink                                               AltaLink




                                                                             To                        T4
                                                                                                  130/13.8 kV
                                                                             Customer                                                                                                 N.O.            N.O.          N.O.
                                                                                                 30/40/50 MVA




            760L – 138kV to
            760L – 138kV to
           Amoco Empress 163S
           Amoco Empress 163S
                                                             869L
                                                                                                                                                    T2




                                                                                                                                      138kV




                                                                                                             20Ω
                                                                                                                                               132/23.9 kV
      New Span                        New Airbreaks
                                                                                                                                               7.5/10 MVA                            25kV Bus
                                      Require Parallel              N.C.                869L – 138kV from                                                         N.O.
      Required                        Break Capability                                  163S Amoco Empress


                                                                                                                                                                          U/G
                                        N.O.                           138kV 266 kcmil Partridge Double Circuit

                                        Split and salvage                                869L – 138kV to
                                         small portion                                     Sandy Point
                                             of 869L

                                                                                                                                                    T1
                                                                                                                                               132/24.9 kV                                    427L




           760L – 138kV
           to Medicine Hat
                                                                                                                                              15//16.8 MVA
                                                                                                    T3
                                                                            To                 130/13.8 kV




                                                      869L
                                                                            Customer          30/40/50 MVA
                                                                                                             20Ω




                                        Sandy                                                                                                                         Proposed Empress 394S Development
                                        Point
                                        204S


                                                                                                                                                                                     Figure A-8b

                                                                                             Alberta Electric System Operator
Draft for Discussion                                                                                               A-11                                                                      June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                        951L in from Ware                                                                     951L out to Amoco
                                          Junction 132S                                                                       Empress 163S


                                                               240kV                                                      240kV


                                                                                                                              945L out to Amoco
                                         944L in from Ware
                                                                                                                              Empress 163S
                                         Junction 132S




                                                                       To Jenner                     To Jenner
                                                                       25kV Loads                    25kV Loads




      LEGEND:
                 Substation Fence           Transformer                Fuse                     Proposed Additions
                                                                                                                                       Proposed Jenner 275S Development
                  Motorized Air Break        Circuit Breaker             Generation                   Disconnect Switch

                  AutoTransformer           Capacitor Bank                Motorized air break       Proposed Development                          Figure A-9
                                                                          with arcing horn



                                                                Alberta Electric System Operator
Draft for Discussion                                                                   A-12                                                          June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




      LEGEND:
                 Substation Fence           Transformer              Fuse                     Proposed Additions
                                                                                                                         Proposed McNeill 840S Development
                  Motorized Air Break        Circuit Breaker           Generation                   Disconnect Switch

                  AutoTransformer           Capacitor Bank              Motorized air break       Proposed Development             Figure A-10
                                                                        with arcing horn


                                                               Alberta Electric System Operator
Draft for Discussion                                                                 A-13                                             June 6, 2007
                                Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                   25 kV Load         25 kV Load   25 kV Load              25 kV Load




                                       25 kV

                                                            N.O.




    795L - 138kV
  TO BROOKS - 121S




                                                                                                       27 MVAR




                                                   821L - 138kV
                                               TO VAUXHALL - 158S                                                            New 138 kV Circuit
                                                                                                                               to Burdett 368S




  LEGEND:

        Transformer                             Proposed Development

                                                   Shunt Capacitorc
                                                                                                                        Proposed Hays 421S Development
        Manual Air Break (ganged)

         Manual Air Break (unganged)              Motorized Air Break


       Circuit Breaker                   CS        Circuit Switcher                                                               Figure A-11


                                                                        Alberta Electric System Operator
Draft for Discussion                                                                            A-14                                   June 6, 2007
                                      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                      C2
      U/G TO                                                                                 NEW 138kV TO
          C1                                                                                 HAYS-421S



                                                                                             (L7) 172L (879L)
    (L1) 172L-                                                                               138kV TO
    138kV TO                                                                                 BULLSHEAD -523S
    TABER-83S
                                      T2 130/24.94kV
                                      25/33/42 MVA

                                                                                             (L2) 722L 138kV TO
   FOR FUTURE
                                                             c/s                             WESTFIELD-107S
    MOBILE SUB
   CONNECTION
                                                                              368S1
                                                                                                                                        (4PT2) 1 PHASE
                                                                             138 kV
                                                                                                                            25 kV Bus




                                                                                                                                        (4PT1) 3 PHASE



                                                       C1
                            U/G TO C2


                                                                                                                  CELL #1

                                                                                                                        EXISTING SWITCHGEAR
                                                                                                                              BUILDING




 Legend
                                                  LTC transformer
          Circuit Breaker

          Potential Transformer                  Proposed Customer
                                                 Development
          Ganged Air-Switch
          (Motor-operated)
                                                 Neutral Grounding Reactor
                                                                                                                                         Proposed Burdett 368S
         Ganged Air-Switch
                                                                                                                                             Development
         (Manual Operation)                c/s         Circuit Switcher
          Hookstick Operated 1ph.
          Disconnect Switch (Solid)
                                                                                                                                                         Figure A-12

                                                                              Alberta Electric System Operator
Draft for Discussion                                                                        A-15                                                          June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           A-16                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                       Appendix B:         Part A - Lethbridge Area




                             Alberta Electric System Operator
Draft for Discussion                            B-1                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            B-2                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                Appendix B-1: Alternative Leth 1-1 – 207L Rebuild




                             Alberta Electric System Operator
Draft for Discussion                           B-1-1                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           B-1-2                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure B1-1 Alternative Leth 1-1 – 207L Rebuild
                                                                    Uplands 241S
                                               North Lethbridge
                                                    370S
      172L to Ft. Macleod                                    734L    813L
                                        172L
                                                                               Macdonald
                                                        207L                     146S
                       New

                                                  Coalbanks 111S
                                                                            823L

                             Bowron            725L
                              674S
                                                                            Lakeview 593S
                         725L
                                                         824L




                                  Alberta Electric System Operator
Draft for Discussion                            B-1-3                               June 6, 2007
              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


   Table B1-1 2012 summer Peak Results for Alt Leth 1-1

                                                                                                 Percentage Loading




                                                                                                                                                                                            Performance Concerns
                                                                                                                                                                                                Other System
                                               370S to Uplands 241S




                                                                                                     823L Macdonald 146S




                                                                                                                           824L Macdonald 593S
                                                                      813L Uplands 241S to




                                                                                                                                                 725L Coalbanks 111S
 Figure No.




                                               734L N. Lethbridge




                                                                                                                                                                       207L N. Lethbridge
                                                                                                                                                                       370S to Coalbanks
                                                                                                                           to Riverbend 618S
                                                                                                     to Lakeview 593S
                                                                      Macdonald 146S




                                                                                                                                                 to Bowron 674S/
                         Outage




                                                                                                                                                 Riverbed 618S




                                                                                                                                                                       111S
B1-1            All Elements in Service              64%                     43%                           15%                     7%                31%                   24%               none

                734L N. Lethbridge 370S to
B1-2            Uplands 241S
                                                           --                22%                           42%                   65%                 84%                   41%               none

                813L Uplands 241S to
B1-3            Macdonald 146S
                                                     21%                           --                      23%                   47%                 65%                   35%               none

                823L Macdonald 146S to
B1-4            Lakeview 593S
                                                     47%                     26%                                --               23%                 45%                   28%               none

                824L Macdonald 593S to
B1-5            Riverbend 618S
                                                     73%                     52%                           23%                         --            24%                   22%               none

                725L Coalbanks 111S to
B1-6            Bowron 674S/ Riverbed                72%                     51%                           22%                     2%                   --                 14%               none
                618S
                207L N. Lethbridge 370S to
B1-7            Coalbanks 111S
                                                     69%                     48%                           19%                     4%                26%                      --             none

                New N. Lethbridge 370S to
B1-8            Coalbanks 111S line
                                                     69%                     48%                           19%                     4%                26%                   45%               none




                                             Alberta Electric System Operator
   Draft for Discussion                                                                      B-1-4                                                                     June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




           Appendix B-1: Alternative Leth 1-2 – 734L/813L Rebuild




                             Alberta Electric System Operator
Draft for Discussion                           B-2-1                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           B-2-2                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


  Figure B2-1 Alternative Leth 1-2 – 734L/813L Rebuild (Preferred Development)


                                                                  Uplands 241S

                                             North Lethbridge
                                                  370S
  172L to Ft. Macleod                                      734L   813L
                                      172L
                                                                            Macdonald
                                                      207L                    146S
                       New
                                                Coalbanks 111S
                                                                         823L

                         Bowron              725L
                          674S
                                                                         Lakeview 593S

                        725L
                                                         824L




                                  Alberta Electric System Operator
Draft for Discussion                             B-2-3                              June 6, 2007
              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                            Table B2-1 2012 summer Peak Results for Alt Leth 1-2


                                                                                                 Percentage Loading




                                                                                                                                                                                            Performance Concerns
                                                                                                                                                                                                Other System
                                               370S to Uplands 241S




                                                                                                     823L Macdonald 146S




                                                                                                                           824L Macdonald 593S
                                                                      813L Uplands 241S to




                                                                                                                                                 725L Coalbanks 111S
 Figure No.




                                               734L N. Lethbridge




                                                                                                                                                                       207L N. Lethbridge
                                                                                                                                                                       370S to Coalbanks
                                                                                                                           to Riverbend 618S
                                                                                                     to Lakeview 593S
                                                                      Macdonald 146S




                                                                                                                                                 to Bowron 674S/
                         Outage




                                                                                                                                                 Riverbed 618S




                                                                                                                                                                       111S
B2-2            All Elements in Service        38%                    17%                            31%                   7%                    16%                   57%                   none
B2-3            734L N. Lethbridge 370S to     --                     21%                            25%                   3%                    21%                   61%                   none
                Uplands 241S
B2-4            813L Uplands 241S to           21%                    --                             27%                   5%                    18%                   59%                   none
                Macdonald 146S
B2-5            823L Macdonald 146S to         24%                    3.9%                           --                    23%                   42%                   82%                   none
                Lakeview 593S
B2-6            824L Macdonald 593S to         35%                    14%                            23%                   --                    22%                   63%                   none
                Riverbend 618S
B2-7            725L Coalbanks 111S to         35%                    14%                            23%                   2%                    --                    41%                   none
                Bowron 674S/ Riverbed
                618S
B2-8            207L N. Lethbridge 370S to     60%                    39%                            78%                   55%                   78%                   --                    none
                Coalbanks 111S
B2-9            New Lethbridge 370S to         71%                    51%                            22%                   2%                    23%                   64%                   none
                Macdonald 146S




                                             Alberta Electric System Operator
   Draft for Discussion                                                                      B-2-4                                                                     June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                       Appendix C:           Part A - Empress Area




                             Alberta Electric System Operator
Draft for Discussion                           C-1                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           C-2                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




  Appendix C-1: Alternative Emp 3-1 – 951L Jenner 275 Termination




                             Alberta Electric System Operator
Draft for Discussion                           C-1-1                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           C-1-2                              June 6, 2007
                         Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table C1–1:            Summary of Alterative Emp-3-1 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW
                       Export to Saskatchewan, Zero Area Generation)

                                     Outage                                    Overloaded Element                 Percent        Other System
                                                                                                                  Loading        Performance
                                                                                                                                  Concerns




  Figure
  No.
 C1-1      All Elements in Service                                                     none                           --             none
 C1-2      944L Ware Junction 132S to Jenner 275S                                      none                           --      See note (1) below
 C1-3      945L Jenner 275S to Amoco Empress 163S                  951L Jenner 275S to Amoco Empress                109%      See note (1) below
                                                                   163S (terminal equipment limited)
 C1-4      931L Ware Junction 132S to West Brooks 28S                                  none                           --             none
 C1-5      933L Anderson 801S to West Brooks 28S                                       none                           --             none
 C1-6      934L or 950L Anderson 801S to Ware Junction                                 none                           --             none
 C1-7      923L/927L or 924L/935L West Brooks 28S to Langdon                           none                           --             none
           102S and North Lethbridge 370S
 C1-8      830L Amoco Empress 163S to McNeil Converter                                 none                           --             none
           Station 830S
 C1-9      944L and 951L Ware Junction 132S to Jenner 275S or                          none                           --      See note (2) below
           945L and 951L Jenner 275S to Amoco Empress 163S
 C1-10     934L and 950L Anderson 801S to Ware Junction 132S                           none                           --      See note (3) below

 C1-11     923L/927L and 924L/935L West Brooks 28S to                                  none                           --      See note (3) below
           Langdon 102S and North Lethbridge 370S
 1) 240 kV and 138 kV voltages in the Empress Area are below minimum operating limits despite all reactive power support
      equipment being in place.
 2) A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to the Empress area. The entire Empress Area load
    and export to Saskatchewan can not be supplied over the existing 138 kV lines regardless of the amount of reactive power support added
    in the Empress area. Under such conditions, the converter power transfer controls will act to rapidly to curtail power transfer over the DC-
    tie. As well, the existing Amoco Empress 163S reverse power remedial action scheme will act to disconnect the 240 kV supplied loads
    following these Category C contingencies. The results depict the system condition after these automatic control actions have taken place.
 3) Voltages in the Empress area will be too low to support full export over the DC tie. Under such conditions, the converter power transfer
    controls will act to rapidly to curtail power transfer over the DC-tie




                                                    Alberta Electric System Operator
Draft for Discussion                                                   C-1-3                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure C1-12: V-Q analysis results for Alt Emp-3-1 – Category B conditions
               100


                   90


                   80


                   70


                   60


                   50


                   40


                   30



               1920


                   10


                       0


               -10


               -20


               -30


               -40


               -50


               -60


               -70                                                                                                                             Contingency 1
                                                                                                                                               Contingency 2
               -80
                                                                                                                                               Contingency 3
               -90                                                                                                                             Contingency 4
                                                                                                                                               Contingency 5
              -100
                  0.80      0.82    0.84    0.86    0.88    0.90   0.92   0.94   0.96   0.98   1.00   1.02    1.04    1.06    1.08    1.10     Contingency 6




Figure C1-13:                      V-Q analysis results for Alt Emp-3-1 – Category C conditions
             200



             180




             160




             140



             120



            102
             100




               80



               60



               40




               20




                   0




             -20



             -40
                                                                                                                                                Base Case
                                                                                                                                                Contingency 1
             -60
                                                                                                                                                Contingency 2
                                                                                                                                                Contingency 3
             -80
                                                                                                                                                Contingency 4
                                                                                                                                                Contingency 5
            -100
                0.80       0.82    0.84    0.86    0.88     0.90   0.92   0.94   0.96   0.98   1.00    1.02    1.04    1.06    1.08     1.10    Contingency 6




                                                           Alberta Electric System Operator
Draft for Discussion                                                                      C-1-4                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix C-2: Alternative Emp 3-2 – 951L Jenner 275 Termination &
              2 (two) 27 MVAr Capacitor Banks at McNeill 840S




                             Alberta Electric System Operator
Draft for Discussion                           C-2-1                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           C-2-2                              June 6, 2007
                         Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table C2–1:            Summary of Alterative Emp-3-2 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW
                       Export to Saskatchewan, Zero Area Generation)

                                     Outage                                   Overloaded Element                  Percent        Other System
                                                                                                                  Loading        Performance
                                                                                                                                  Concerns




  Figure
  No.
 C2-1      All Elements in Service                                                     none                           --             none
 C2-2      944L Ware Junction 132S to Jenner 275S                                      none                           --             none
 C2-3      945L Jenner 275S to Amoco Empress 163S                  951L Jenner 275S to Amoco Empress                108%             none
                                                                   163S (terminal equipment limited)
 C2-4      931L Ware Junction 132S to West Brooks 28S                                  none                           --             none
 C2-5      933L Anderson 801S to West Brooks 28S                                       none                           --             none
 C2-6      934L or 950L Anderson 801S to Ware Junction                                 none                           --             none
 C2-7      923L/927L or 924L/935L West Brooks 28S to Langdon                           none                           --             none
           102S and North Lethbridge 370S
 C2-8      830L Amoco Empress 163S to McNeil Converter                                 none                           --             none
           Station 830S
 C2-9      944L and 951L Ware Junction 132S to Jenner 275S or                          none                           --      See note (1) below
           945L and 951L Jenner 275S to Amoco Empress 163S
 C2-10     934L and 950L Anderson 801S to Ware Junction 132S                           none                           --      See note (2) below

 C2-11     923L/927L and 924L/935L West Brooks 28S to                                  none                           --             none
           Langdon 102S and North Lethbridge 370S
 1) A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to the Empress area. The entire Empress Area load
    and export to Saskatchewan can not be supplied over the existing 138 kV lines regardless of the amount of reactive power support added
    in the Empress area. Under such conditions, the converter power transfer controls will act to rapidly to curtail power transfer over the DC-
    tie. As well, the existing Amoco Empress 163S reverse power remedial action scheme will act to disconnect the 240 kV supplied loads
    following these Category C contingencies. The results depict the system condition after these automatic control actions have taken place.
 2) Voltages in the Empress area will be too low to support full export over the DC tie. Under such conditions, the converter power transfer
    controls will act to rapidly to curtail power transfer over the DC-tie




                                                    Alberta Electric System Operator
Draft for Discussion                                                  C-2-3                                                          June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure C2-12: V-Q analysis results for Alt Emp-3-2 – Category B conditions
              100


                  90


                  80


                  70


                  60


                  50


                  40


                  30


                  20


                  10


                    0


              -10


              -20
             -20


              -30


              -40


              -50


              -60
                                                                                                                                    Base Case
              -70                                                                                                                   Contingency 1
                                                                                                                                    Contingency 2
              -80
                                                                                                                                    Contingency 3
              -90                                                                                                                   Contingency 4
                                                                                                                                    Contingency 5
             -100
                 0.80     0.82   0.84   0.86   0.88    0.90   0.92   0.94   0.96   0.98   1.00   1.02   1.04   1.06   1.08   1.10   Contingency 6




Figure C2-13: V-Q analysis results for Alt Emp-3-2 – Category C conditions
             200



             180




             160




             140



             120




             100




               80

             69

               60



               40



               20




                   0




             -20



             -40                                                                                                                    Base Case
                                                                                                                                    Contingency 1
             -60                                                                                                                    Contingency 2
                                                                                                                                    Contingency 3
             -80
                                                                                                                                    Contingency 4
                                                                                                                                    Contingency 5
            -100
                   0.80   0.82   0.84   0.86   0.88    0.90   0.92   0.94   0.96   0.98   1.00   1.02   1.04   1.06   1.08   1.10   Contingency 6




                                                      Alberta Electric System Operator
Draft for Discussion                                                                C-2-4                                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix C-3: Alternative Emp 3-3 – 951L Jenner 275 Termination, 1
              (one) 50 MVAr SVC at Empress 394S & 2 (two) 27
              MVAr Capacitor Banks at McNeill 840S




                             Alberta Electric System Operator
Draft for Discussion                           C-3-1                              June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           C-3-2                              June 6, 2007
                         Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table C3–1:            Summary of Alterative Emp-3-3 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW
                       Export to Saskatchewan, Zero Area Generation)

                                     Outage                                    Overloaded Element                 Percent        Other System
                                                                                                                  Loading        Performance
                                                                                                                                  Concerns




  Figure
  No.
 C3-1      All Elements in Service                                                     none                           --             none
 C3-2      944L Ware Junction 132S to Jenner 275S                                      none                           --             none
 C3-3      945L Jenner 275S to Amoco Empress 163S                  951L Jenner 275S to Amoco Empress                108%             none
                                                                   163S (terminal equipment limited)
 C3-4      931L Ware Junction 132S to West Brooks 28S                                  none                           --             none
 C3-5      933L Anderson 801S to West Brooks 28S                                       none                           --             none
 C3-6      934L or 950L Anderson 801S to Ware Junction                                 none                           --             none
 C3-7      923L/927L or 924L/935L West Brooks 28S to Langdon                           none                           --             none
           102S and North Lethbridge 370S
 C3-8      830L Amoco Empress 163S to McNeil Converter                                 none                           --             none
           Station 830S
 C3-9      944L and 951L Ware Junction 132S to Jenner 275S or                          none                           --      See note (1) below
           945L and 951L Jenner 275S to Amoco Empress 163S
 C3-10     934L and 950L Anderson 801S to Ware Junction 132S                           none                           --             none

 C3-11     923L/927L and 924L/935L West Brooks 28S to                                  none                           --             none
           Langdon 102S and North Lethbridge 370S
 1) A category C contingency involving 944L, 945L and 951L removes the 240 kV feed to the Empress area. The entire Empress Area load
    and export to Saskatchewan can not be supplied over the existing 138 kV lines regardless of the amount of reactive power support added
    in the Empress area. Under such conditions, the converter power transfer controls will act to rapidly to curtail power transfer over the DC-
    tie. As well, the existing Amoco Empress 163S reverse power remedial action scheme will act to disconnect the 240 kV supplied loads
    following these Category C contingencies. The results depict the system condition after these automatic control actions have taken place.




                                                    Alberta Electric System Operator
Draft for Discussion                                                   C-3-3                                                         June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure C3-12:                    V-Q analysis results for Alt Emp-3-3 – Category B conditions
              100


                 90


                 80


                 70


                 60


                 50


                 40


                 30


                 20


                 10


                    0


              -10


              -20


              -30


              -40


              -50


              -60
             -63
              -70


              -80


              -90

                                                                                                                                    Base Case
            -100
                                                                                                                                    Contingency 1
            -110
                                                                                                                                    Contingency 2
            -120                                                                                                                    Contingency 3
            -130
                                                                                                                                    Contingency 4
                                                                                                                                    Contingency 5
            -140
                   0.80   0.82   0.84   0.86   0.88    0.90   0.92   0.94   0.96   0.98   1.00   1.02   1.04   1.06   1.08   1.10   Contingency 6




Figure C3-13:                    V-Q analysis results for Alt Emp-3-3 – Category C conditions
             100




                 80




                 60




                 40




                 20



             5
                   0




             -20




             -40




             -60




             -80




            -100


                                                                                                                                    Base Case
            -120                                                                                                                    Contingency 1
                                                                                                                                    Contingency 2
            -140
                                                                                                                                    Contingency 3
                                                                                                                                    Contingency 4
                                                                                                                                    Contingency 5
            -160
                   0.80   0.82   0.84   0.86   0.88    0.90   0.92   0.94   0.96   0.98   1.00   1.02   1.04   1.06   1.08   1.10   Contingency 6




                                                      Alberta Electric System Operator
Draft for Discussion                                                                C-3-4                                               June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix D:            Part A – Vauxhall-Medicine Hat Areas




                             Alberta Electric System Operator
Draft for Discussion                           D-1                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           D-2                                      June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix D-1: Alternative VM-1 – Hays 421S to Burdett 368S 138 kV
              Line




                             Alberta Electric System Operator
Draft for Discussion                           D-1-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           D-1-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                                                     Figure D1-1 Alternative VM-1
                                                  To Anderson 801S &                                                                                                  To Oyen
                                               Sheerness Generating Station                                                                                            767S
                                                                       9L934/




                                                                                                                                                                                 7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                                                             Empress Liquids
                                                                                                                                                                   164S
                                                                         132S                                                Wardlow
                                                                                                                                                                       760AL                   Amoco
                                                                                                                              230S
                                            Bassano                                                                                                        Sandy Point   869                  Empress
                                             435S                   931L                                                                                                     L
                                                                                                                                                              204S                              163S
                                                                            Duchess                                             Jenner                                    760L
                                                                                                                                                               Empress
                                                                                                            951L                 275S
                                                                             339S                                                                                394S     871L
                                                                                                            944L                            945L
                          To Queenstown                                        Cutting Lake                                                                               Sand Hills 830L
                              504S                   853L                         227S                                                                                      341S
                                   935L                             814L
                                                                      827L Brooks                Tilley                                                                         McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                                               Convertor
                                                                                                                                                                             Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                                                               795L

                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                 Chappice Lake           760L
                                        447S                                                                                                   649S
                                                           763L




                                                                                                                                   100L
                                                                                                                                  (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                              Medicine Hat

                                                                               Vauxhall                                                          41S


                                                                                                                     172L
                                                                                                                                            172L (880L)
                                                                                                                                            Bullshead
                                                                                                                                                               Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)                    523S
                                                                                                                                            600L
                                                                                                                                                                 Hat
                                                         Taber                                                                                   Wind Farm
                                                                                                        2L




                                                          83S                                                                                    Project 513
      172L                           820L
                                                                                                      72




                                      Chin Chute                                        Taber Wind                                                 31 MW
  N. Lethbridge       L
                   734241S                                                                Farm
                                                                      172AL
                                                                      (607L)




                                     Wind 30MW                                                                                                Peace Butte
      370S 207L         13L                                                               80MW              Westfield
                       8        Chin Chute IPP                                                                                                   404S
                111S    146S                                                                                 107S
     725L              823L         11MW
                      L




                       Lakeview
                  725A




   Lethbridge
                         593S                                           Conrad
                                            66L




      674S
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                   Note: Line numbers in barckets denote new line numbers
               863L




                                         To
                                       Stirling                                                                    138 kV
                                        67S                                                                                                        Thermal Plant
            To                                                                                                     240 kV
                                                                                                                                                   Wind Farm
          Magrath
           225S                                                                                                    Planned
                                                                                                                                                   Proposed Wind Farm
                                                                                                                   New
                   To
           Great Falls, Montana
             (merchant line)




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                  D-1-3                                                                   June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1–1:              Summary of Alt-VM-1 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW Export to
                         Saskatchewan, Zero Area Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D1-2           All Elements in Service                                                none                          --         none
 D1-3           924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D1-4           944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D1-5           945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D1-6           N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D1-7           W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D1-8           Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D1-9           172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D1-10          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D1-11          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D1-12          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D1-13          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D1-14          795L Brooks 121S to Hays 421S                                          none                          --         none
 D1-15          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D1-16          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D1-17          New Hays 421S to Burdett 368S 138 kV line                              none                          --         none
 D1-18          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D1-19          823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-1-4                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1–2:              Summary of Alt-VM-1 Contingency Analysis – Scenario 3b (2012 Summer Minimum, 150 MW
                         Export to Saskatchewan, Maximum Area Generation)

                                 Outage (1)                                Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
D1-20          All Elements in Service                                            None                            --            none
D1-21          172L Taber 83S to Fincastle 336S                                   None                            --            none
D1-22          172L Bullshead 523S to Burdett 368S                                None                            --            none
D1-23          172L Medicine Hat 41S to Bullshead 523S                            None                            --            none
D1-24          100L Medicine Hat 41S to Suffield 895S                             None                            --            none
D1-25          760L Medicine Hat 41S to Chappice Lake 649S                        None                            --            none
D1-26          New Hays 421S to Burdett 368S 138 kV line                           none                           --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                     D-1-5                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1–3: Summary of Alt-VM-1 Contingency Analysis – Scenario 4a (2012 Summer Peak, 150 MW Import from
          Saskatchewan, Zero Area Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D1-27          All Elements in Service                                                none                          --         none
 D1-28          924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D1-29          944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D1-30          945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D1-31          N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D1-32          W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D1-33          Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D1-34          172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D1-35          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D1-36          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D1-37          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D1-38          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D1-39          795L Brooks 121S to Hays 421S                                          none                          --         none
 D1-40          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D1-41          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D1-42          New Hays 421S to Burdett 368S 138 kV line                              none                          --         none
 D1-43          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D1-44          823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-1-6                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1-4: Summary of Alt-VM-1 Contingency Analysis – Scenario 4b (2012 Summer Minimum, 150 MW Import
           from Saskatchewan, Maximum Area Generation)

                                 Outage (1)                                Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
D1-45          All Elements in Service                                            None                            --            none
D1-46          172L Taber 83S to Fincastle 336S                                   None                            --            none
D1-47          172L Bullshead 523S to Burdett 368S                                None                            --            none
D1-48          172L Medicine Hat 41S to Bullshead 523S                            None                            --            none
D1-49          100L Medicine Hat 41S to Suffield 895S                             None                            --            none
D1-50          760L Medicine Hat 41S to Chappice Lake 649S                        None                            --            none
D1-51          New Hays 421S to Burdett 368S 138 kV line                           none                           --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                     D-1-7                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1–5: Summary of Alt-VM-1 Contingency Analysis: Sensitivity Case 1 – Bow City Unit In-Service (2012 Summer Peak,
           Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D1-52          All Elements in Service                                                none                          --         none
 D1-53          924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D1-54          923L/927L Little Fox (new) to North Lethbridge                         none                          --         none
                370S to Langdon 102S
 D1-55          West Brooks 28S to Little Fox (new)                                    none                          --         none
 D1-56          944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D1-57          945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D1-58          N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D1-59          W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D1-60          Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D1-61          172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D1-62          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D1-63          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D1-64          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D1-65          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D1-66          795L Brooks 121S to Hays 421S                     763L West Brooks 28S to Enchant Junction         100%         none
 D1-67          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D1-68          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D1-69          New Hays 421S to Burdett 368S 138 kV line                              none                          --         none
 D1-70          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D1-71          823L Macdonald 146S to Lakeview 593S                                   none                          --         none



                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-1-8                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D1–6: Summary of Alt-VM-1 Contingency Analysis: Sensitivity Case 2 – Increased Medicine Hat DTS (2012 Summer
           Peak, Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                     Outage                                      Overloaded Element                 Percent       Other System
                                                                                                                    Loading       Performance
                                                                                                                                   Concerns




   Figure No.
 D1-72          All Elements in Service                           Voltages in the Medicine Hat area are depressed due to the increase load as
                                                                  well as due to the reduction of reactive power support from offline Medicine Hat
                                                                  generators. A total of 40 MVAr in reactive power compensation in side the
                                                                  Medicine Hat system is assumed to maintain acceptable voltages.
 D1-73          924L/935L West Brooks 28S To Lethbridge 370S                           none                             --             none
                to Langdon 102S
 D1-74          944L Ware Junction 132S to Jenner 275S                                 none                             --             none
 D1-75          945L Jenner 275S to Amoco Empress 163S                                 none                             --             none
 D1-76          N. Lethbridge 370S 240/138 kV transformer T3                           none                             --             none
 D1-77          W. Brooks 28S 240/138 kV transformer T1                                none                             --             none
 D1-78          Amoco Empress 163S 240/138 kV transformer                              none                             --             none
 D1-79          172L Bullshead 523S to Medicine Hat 41S                                none                             --             none
 D1-80          100L Brooks 121S to Tilley 498S                   760L Medicine Hat 41S to Chappice Lake              104%      25 kV Voltages at
                                                                  649S                                                          Tilley 498S drop
                                                                  760L Chappice Lake 649S to Empress 163S             110%      by 9.5 percent

 D1-81          172L Taber 83S to Fincastle 336S                                       none                             --             none
 D1-82          172L Coaldale 254S to Taber 83S                                        none                             --             none
 D1-83          763L West Brooks 28S to Vauxhall 158S                                  none                             --             none
 D1-84          795L Brooks 121S to Hays 421S                     763L West Brooks 28S to Enchant Junction            97%              none
 D1-85          814L West Brooks 28S to Brooks 121S                                    none                             --             none
 D1-86          760L Empress 163S to Chappice Lake 649S           100L Brooks 121S to Tilley 498S                     100%             none
 D1-87          New Hays 421S to Burdett 368S 138 kV line                              none                             --             none
 D1-88          207L N. Lethbridge 370S to Lethbridge 111S                             none                             --             none
 D1-89          823L Macdonald 146S to Lakeview 593S                                   none                             --             none

                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-1-9                                                           June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Table D1–7: Summary of Alt-VM-1 Contingency Analysis – Sensitivity Case 3 (2012 Summer Minimum, Zero Alberta-
           Saskatchewan Interchange, Maximum Area Generation)

                                 Outage (1)                                Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
D1-90          All Elements in Service                                            None                            --            none
D1-91          172L Taber 83S to Fincastle 336S                                   None                            --            none
D1-92          172L Bullshead 523S to Burdett 368S                                None                            --            none
D1-93          172L Medicine Hat 41S to Bullshead 523S                            None                            --            none
D1-94          100L Medicine Hat 41S to Suffield 895S            760L Medicine Hat 41S to Chappice Lake          99%            none
                                                                                 649S
                                                               760L Chappice Lake 649S to Empress 394S           96%
D1-95          760L Medicine Hat 41S to Chappice Lake 649S                        None                            --            none
D1-96          New Hays 421S to Burdett 368S 138 kV line                           none                           --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                    D-1-10                                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix D-2: Alternative VM-2 – Hays 421S to Bullshead 523S 138
              kV Line




                             Alberta Electric System Operator
Draft for Discussion                           D-2-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           D-2-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure D2-1 Alternative VM-2
                                                  To Anderson 801S &                                                                                                  To Oyen
                                               Sheerness Generating Station                                                                                            767S
                                                                       9L934/




                                                                                                                                                                                 7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                             Empress Liquids
                                                                                                                                                                   164S
                                                                         132S                                                                                          760AL
                                                                                                                              230S                                                             Amoco
                                            Bassano                                                                                                        Sandy Point   869                  Empress
                                             435S                   931L                                                                                                     L
                                                                                                                                                              204S                              163S
                                                                            Duchess                                             Jenner                                    760L
                                                                                                                                                               Empress
                                                                                                            951L                 275S
                                                                             339S                                                                                394S     871L
                                                                                                            944L                            945L
                          To Queenstown                                        Cutting Lake                                                                               Sand Hills 830L
                              504S                   853L                         227S                                                                                      341S
                                   935L                             814L
                                                                      827L Brooks                Tilley                                                                         McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                                               Convertor
                                                                                                                                                                             Station 840S
                               2x525 MW                                                              100L
                               (proposed)                                      795L
                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                 Chappice Lake           760L
                                        447S                                                                                                   649S
                                                           763L




                                                                                                                                   100L
                                                                                                                                  (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                              Medicine Hat

                                                                               Vauxhall                                                          41S


                                                                                                                     172L
                                                                                                                                            172L (880L)
                                                                                                                                            Bullshead
                                                                                                                                                               Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)                    523S
                                                                                                                                            600L
                                                                                                                                                                 Hat
                                                         Taber                                                                                   Wind Farm
                                                                                                        2L




                                                          83S                                                                                    Project 513
      172L                           820L
                                                                                                      72




                                      Chin Chute                                        Taber Wind                                                 31 MW
  N. Lethbridge       L
                   734241S                                                                Farm
                                                                      172AL
                                                                      (607L)




                                     Wind 30MW                                                                                                Peace Butte
      370S 207L            L                                                              80MW
                       813      Chin Chute IPP                                                              Westfield                            404S
                111S    146S                                                                                 107S
     725L              823L         11MW
                      L




                       Lakeview
                  725A




   Lethbridge
                         593S                                           Conrad
                                            66L




      674S
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                   Note: Line numbers in barckets denote new line numbers
               863L




                                         To
                                       Stirling                                                                    138 kV
                                        67S                                                                                                        Thermal Plant
            To                                                                                                     240 kV
                                                                                                                                                   Wind Farm
          Magrath
           225S                                                                                                    Planned
                                                                                                                                                   Proposed Wind Farm
                                                                                                                   New
                   To
           Great Falls, Montana
             (merchant line)




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                  D-2-3                                                                   June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                Table D2–1: Summary of Alt-VM-2 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW Export to
                                                       Saskatchewan, Zero Area Generation)

                                      Outage                                      Overloaded Element              Percent     Other System
                                                                                                                  Loading     Performance
                                                                                                                               Concerns




   Figure No.
 D2-2            All Elements in Service                                                none                          --         none
 D2-3            924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                 to Langdon 102S
 D2-4            944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D2-5            945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D2-6            N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D2-7            W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D2-8            Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D2-9            172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D2-10           100L Brooks 121S to Tilley 498S                                        none                          --         none
 D2-11           172L Taber 83S to Fincastle 336S                                       none                          --         none
 D2-12           172L Coaldale 254S to Taber 83S                                        none                          --         none
 D2-13           763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D2-14           795L Brooks 121S to Hays 421S                                          none                          --         none
 D2-15           814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D2-16           760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D2-17           New Hays 421S to Bullshead 523S 138 kV line                            none                          --         none
 D2-18           207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D2-19           823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                         Alberta Electric System Operator
Draft for Discussion                                                      D-2-4                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D2–2: Summary of Alt-VM-2 Contingency Analysis – Scenario 3b (2012 Summer Minimum, 150 MW Export to
           Saskatchewan, Maximum Area Generation)

                                 Outage (1)                               Overloaded Element                   Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
D2-20          All Elements in Service                                            None                            --            none
D2-21          172L Taber 83S to Fincastle 336S                                   None                            --            none
D2-22          172L Bullshead 523S to Burdett 368S                                None                            --            none
D2-23          172L Medicine Hat 41S to Bullshead 523S                            None                            --            none
D2-24          100L Medicine Hat 41S to Suffield 895S                             None                            --            none
D2-25          760L Medicine Hat 41S to Chappice Lake                             None                            --            none
               649S
D2-26          New Hays 421S to Bullshead 523 138 kV line                         none                            --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                     D-2-5                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D2–3: Summary of Alt-VM-2 Contingency Analysis – Scenario 4a (2012 Summer Peak, 150 MW Import from
           Saskatchewan, Zero Area Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D2-27          All Elements in Service                                                none                          --         none
 D2-28          924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D2-29          944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D2-30          945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D2-31          N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D2-32          W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D2-33          Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D2-34          172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D2-35          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D2-36          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D2-37          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D2-38          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D2-39          795L Brooks 121S to Hays 421S                                          none                          --         none
 D2-40          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D2-41          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D2-42          New Hays 421S to Bullshead 523S 138 kV line                            none                          --         none
 D2-43          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D2-44          823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-2-6                                                    June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D2-4: Summary of Alt-VM-2 Contingency Analysis – Scenario 4b (2012 Summer Minimum, 150 MW Import from
            Saskatchewan, Maximum Area Generation)

                                  Outage (1)                               Overloaded Element                 Percent       Other System
                                                                                                              Overload      Performance
                                                                                                                             Concerns




  Figure No.
D2-45          All Elements in Service                                            None                           --            none
D2-46          172L Taber 83S to Fincastle 336S                                   None                           --            none
D2-47          172L Bullshead 523S to Burdett 368S                                None                           --            none
D2-48          172L Medicine Hat 41S to Bullshead 523S                            None                           --            none
D2-49          100L Medicine Hat 41S to Suffield 895S                             None                           --            none
D2-50          760L Medicine Hat 41S to Chappice Lake 649S                        None                           --            none
D2-51          New Hays 421S to Bullshead 523 138 kV line                          none                          --            none




                                                        Alberta Electric System Operator
Draft for Discussion                                                    D-2-7                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D2–5: Summary of Alt-VM-2 Contingency Analysis: Sensitivity Case 1 – Bow City Unit In-Service (2012 Summer Peak,
           Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D2-52          All Elements in Service                                                none                          --         none
 D2-53          924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D2-54          923L/927L Little Fox (new) to North Lethbridge                         none                          --         none
                370S to Langdon 102S
 D2-55          West Brooks 28S to Little Fox (new)                                    none                          --         none
 D2-56          944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D2-57          945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D2-58          N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D2-59          W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D2-60          Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D2-61          172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D2-62          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D2-63          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D2-64          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D2-65          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D2-66          795L Brooks 121S to Hays 421S                     763L West Brooks 28S to Enchant Junction         96%          none
 D2-67          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D2-68          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D2-69          New Hays 421S to Bullshead 523S kV line                                none                          --         none
 D2-70          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D2-71          823L Macdonald 146S to Lakeview 593S                                   none                          --         none



                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-2-8                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D2-6: Summary of Alt-VM-2 Contingency Analysis: Sensitivity Case 2 – Increased Medicine Hat DTS (2012 Summer
            Peak, Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                    Outage                                Overloaded Element                Percent           Other System
                                                                                                            Loading      Performance Concerns




   Figure No.
 D2-72          All Elements in Service                         Voltages in the Medicine Hat area are depressed due to the increase load as well
                                                                as due to the reduction of reactive power support from offline Medicine Hat
                                                                generators. A total of 40 MVAr in reactive power compensation in side the Medicine
                                                                Hat system is assumed to maintain acceptable voltages.
 D2-73          924L/935L West Brooks 28S To Lethbridge                           none                          --                none
                370S to Langdon 102S
 D2-74          944L Ware Junction 132S to Jenner 275S                            none                          --                none
 D2-75          945L Jenner 275S to Amoco Empress 163S                            none                          --                none
 D2-76          N. Lethbridge 370S 240/138 kV transformer T3                      none                          --                none
 D2-77          W. Brooks 28S 240/138 kV transformer T1                           none                          --                none
 D2-78          Amoco Empress 163S 240/138 kV transformer                         none                          --                none
 D2-79          172L Bullshead 523S to Medicine Hat 41S                           none                          --                none
 D2-80          100L Brooks 121S to Tilley 498S                 760L Chappice Lake 649S to Empress            92%                 none
                                                                163S
 D2-81          172L Taber 83S to Fincastle 336S                100L Brooks 121S to Tilley 498S               92%      138 and 25 kV Voltages in
                                                                                                                       the Fincastle 336S area
                                                                                                                       drop by 10 percent &
                                                                                                                       below 0.9 p.u.
 D2-82          172L Coaldale 254S to Taber 83S                                   none                          --                none
 D2-83          763L West Brooks 28S to Vauxhall 158S                             none                          --                none
 D2-84          795L Brooks 121S to Hays 421S                   763L West Brooks 28S to Enchant               97%                 none
                                                                Junction
 D2-85          814L West Brooks 28S to Brooks 121S                               none                          --                none
 D2-86          760L Empress 163S to Chappice Lake 649S         100L Brooks 121S to Tilley 498S               92%                 none
 D2-87          New Hays 421S to Bullshead 523S 138 kV line                       none                          --                none


                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-2-9                                                           June 6, 2007
                                Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                       Outage                               Overloaded Element               Percent            Other System
                                                                                                             Loading       Performance Concerns




      Figure No.
 D2-88             207L N. Lethbridge 370S to Lethbridge 111S                       none                         --               none
 D2-89             823L Macdonald 146S to Lakeview 593S                             none                         --               none



Table D2-7: Summary of Alt-VM-2 Contingency Analysis – Sensitivity Case 3 (2012 Summer Minimum, Zero Alberta-
            Saskatchewan Interchange, Maximum Area Generation)

                                      Outage (1)                               Overloaded Element                 Percent        Other System
                                                                                                                  Overload       Performance
                                                                                                                                  Concerns




  Figure No.
D2-90              All Elements in Service                                            None                            --             none
D2-91              172L Taber 83S to Fincastle 336S                                   None                            --             none
D2-92              172L Bullshead 523S to Burdett 368S                                None                            --             none
D2-93              172L Medicine Hat 41S to Bullshead 523S                            None                            --             none
D2-94              100L Medicine Hat 41S to Suffield 895S                             None                            --             none
D2-95              760L Medicine Hat 41S to Chappice Lake 649S                        None                            --             none
D2-96              New Hays 421S to Bullshead 523S 138 kV line                         none                           --             none




                                                            Alberta Electric System Operator
Draft for Discussion                                                       D-2-10                                                        June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix D-3: Alternative VM-3 – Hays 421S to Redcliff (new)
              138 kV Line




                             Alberta Electric System Operator
Draft for Discussion                           D-3-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           D-3-2                                    June 6, 2007
     Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure D3-1                    Alternative VM-3



                                                    To Anderson 801S &                                                                                                  To Oyen
                                                 Sheerness Generating Station                                                                                            767S
                                                                         9L934/




                                                                                                                                                                                   7L760/760L
                                                            933L         9L950
                 N                    Brooks                            Ware Junction
                                                                                                                                                               Empress Liquids
                                                                                                                                                                     164S
                                                                           132S                                                   Wardlow
                                                                                                                                                                         760AL                   Amoco
                                                                                                                                   230S
                                              Bassano                                                                                                        Sandy Point   869                  Empress
                                               435S                   931L                                                                                                     L
                                                                                                                                                                204S                              163S
                                                                              Duchess                                             Jenner                                    760L
                                                                                                                                                                 Empress
                                                                                                              951L                 275S
                                                                               339S                                                                                394S     871L
                                                                                                              944L                            945L
                            To Queenstown                                        Cutting Lake                                                                               Sand Hills 830L
                                504S                   853L                         227S                                                                                      341S
                                     935L                             814L
                                                                        827L Brooks                Tilley                                                                         McNeill
                                     923L
                                  Bow City
                               Generating Plant
                                                                    W. Brooks
                                                                       28S
                                                                              121S                 498S                   Empress                                               Convertor
                                                                                                                                                                               Station 840S
                                 2x525 MW                                                              100L
                                 (proposed)
                                                                                 795L




                                            763AL                                                                      Suffield
                                         Enchant                                                                        895S                 Chappice Lake           760L
                                          447S                                                                                                   649S
                                                             763L




                                                                                                                                     100L
                                                                                                                                    (892L)
                                                                                            Hays
                                                     Vauxhall          821L                 421S
                                                      158S
                        924L

                               923L




                                                                                                                                                Medicine Hat

                                                                                 Vauxhall                                                          41S


                                                                                                                       172L
                                                                                                                                              172L (880L)
                                                                                                                                              Bullshead
                                                                                                                                                                 Medicine
                                      Coaldale                          172L             172L Burdett
           Monarch
            492S
                                       254S
                                                    172L
                                                                       (610L)           (612L) 368S                   (879L)                    523S
                                                                                                                                              600L
                                                                                                                                                                   Hat
                                                           Taber                                                                                   Wind Farm
                                                                                                          2L




                                                            83S                                                                                    Project 513
        172L                           820L
                                                                                                        72




                                        Chin Chute                                        Taber Wind                                                 31 MW
    N. Lethbridge    734L                                                                   Farm
                                                                        172AL
                                                                        (607L)




                        241S           Wind 30MW                                                                                                Peace Butte
        370S 207L            L                                                              80MW
                         813      Chin Chute IPP                                                              Westfield                            404S
                  111S    146S                                                                                 107S
       725L              823L         11MW
                        L




                         Lakeview
                    725A




     Lethbridge
                           593S                                           Conrad
                                              66L




        674S
                        824L                                               135S
         Riverbend
          618S          Lethbridge                                                                   Note: Line numbers in barckets denote new line numbers
                 863L




                                           To
                                         Stirling                                                                    138 kV
                                          67S                                                                                                        Thermal Plant
              To                                                                                                     240 kV
                                                                                                                                                     Wind Farm
            Magrath
             225S                                                                                                    Planned
                                                                                                                                                     Proposed Wind Farm
                                                                                                                     New
                     To
             Great Falls, Montana
               (merchant line)




                                                                    Alberta Electric System Operator
  Draft for Discussion                                                                                  D-3-3                                                                   June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                Table D3–1: Summary of Alt-VM-3 Contingency Analysis – Scenario 3a (2012 Summer Peak, 150 MW Export to
                                                       Saskatchewan, Zero Area Generation)

                                      Outage                                      Overloaded Element              Percent     Other System
                                                                                                                  Loading     Performance
                                                                                                                               Concerns




   Figure No.
 D3-2            All Elements in Service                                                none                          --         none
 D3-3            924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                 to Langdon 102S
 D3-4            944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D3-5            945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D3-6            N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D3-7            W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D3-8            Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D3-9            172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D3-10           100L Brooks 121S to Tilley 498S                                        none                          --         none
 D3-11           172L Taber 83S to Fincastle 336S                                       none                          --         none
 D3-12           172L Coaldale 254S to Taber 83S                                        none                          --         none
 D3-13           763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D3-14           795L Brooks 121S to Hays 421S                                          none                          --         none
 D3-15           814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D3-16           760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D3-17           New Hays 421S to Redcliff (new) 138 kV line                            none                          --         none
 D3-18           100L Redcliff (new) to Medicine Hat 41S                                none                          --         none
 D3-19           100L Redcliff (new) to Suffield 895S                                   none                          --         none
 D3-20           207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D3-21           823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                           Alberta Electric System Operator
Draft for Discussion                                                      D-3-4                                                    June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D3–2: Summary of Alt-VM-3 Contingency Analysis – Scenario 3b (2012 Summer Minimum, 150 MW Export to
           Saskatchewan, Maximum Area Generation)

                                 Outage (1)                               Overloaded Element                  Percent       Other System
                                                                                                              Loading       Performance
                                                                                                                             Concerns




  Figure No.
D3-22          All Elements in Service                                            None                           --            none
D3-23          172L Taber 83S to Fincastle 336S                                   None                           --            none
D3-24          172L Bullshead 523S to Burdett 368S                                None                           --            none
D3-25          172L Medicine Hat 41S to Bullshead 523S                            None                           --            none
D3-26          760L Medicine Hat 41S to Chappice Lake 649S                        None                           --            none
D3-27          New Hays 421S to Redcliff (new) 138 kV line                        none                           --            none
D3-28          100L Redcliff (new) to Medicine Hat 41S                            none                           --            none
D3-29          100L Redcliff (new) to Suffield 895S                               none                           --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                    D-3-5                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D3–3: Summary of Alt-VM-3 Contingency Analysis – Scenario 4a (2012 Summer Peak, 150 MW Import from
           Saskatchewan, Zero Area Generation)

                                     Outage                                      Overloaded Element              Percent     Other System
                                                                                                                 Loading     Performance
                                                                                                                              Concerns




   Figure No.
 D3-30          All Elements in Service                                                none                          --         none
 D3-31          924L/935L West Brooks 28S To Lethbridge 370S                           none                          --         none
                to Langdon 102S
 D3-32          944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D3-33          945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D3-34          N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D3-35          W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D3-36          Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D3-37          172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D3-38          100L Brooks 121S to Tilley 498S                                        none                          --         none
 D3-39          172L Taber 83S to Fincastle 336S                                       none                          --         none
 D3-40          172L Coaldale 254S to Taber 83S                                        none                          --         none
 D3-41          763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D3-42          795L Brooks 121S to Hays 421S                                          none                          --         none
 D3-43          814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D3-44          760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D3-45          New Hays 421S to Redcliff (new) 138 kV line                            none                          --         none
 D3-46          100L Redcliff (new) to Medicine Hat 41S                                none                          --         none
 D3-47          100L Redcliff (new) to Suffield 895S                                   none                          --         none
 D3-48          207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D3-49          823L Macdonald 146S to Lakeview 593S                                   none                          --         none




                                                          Alberta Electric System Operator
Draft for Discussion                                                     D-3-6                                                    June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D3-4: Summary of Alt-VM-3 Contingency Analysis – Scenario 4b (2012 Summer Minimum, 150 MW Import from
            Saskatchewan, Maximum Area Generation)

                                 Outage (1)                               Overloaded Element                  Percent       Other System
                                                                                                              Loading       Performance
                                                                                                                             Concerns




  Figure No.
D3-50          All Elements in Service                                            None                           --            none
D3-51          172L Taber 83S to Fincastle 336S                                   None                           --            none
D3-52          172L Bullshead 523S to Burdett 368S                                None                           --            none
D3-53          172L Medicine Hat 41S to Bullshead 523S                            None                           --            none
D3-54          760L Medicine Hat 41S to Chappice Lake 649S                        None                           --            none
D3-55          New Hays 421S to Redcliff (new) 138 kV line                        none                           --            none
D3-56          100L Redcliff (new) to Medicine Hat 41S                            none                           --            none
D3-57          100L Redcliff (new) to Suffield 895S                               none                           --            none




                                                         Alberta Electric System Operator
Draft for Discussion                                                    D-3-7                                                    June 6, 2007
                         Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table D3–5: Summary of Alt-VM-3 Contingency Analysis: Sensitivity Case 1 – Bow City Unit In-Service (2012 Summer Peak,
           Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                  Outage                                     Overloaded Element              Percent     Other System
                                                                                                             Loading     Performance
                                                                                                                          Concerns




   Figure
   No.
 D3-58      All Elements in Service                                                none                          --         none
 D3-59      924L/935L West Brooks 28S To Lethbridge 370S to                        none                          --         none
            Langdon 102S
 D3-60      923L/927L Little Fox (new) to North Lethbridge                         none                          --         none
            370S to Langdon 102S
 D3-61      West Brooks 28S to Little Fox (new)                                    none                          --
 D3-62      944L Ware Junction 132S to Jenner 275S                                 none                          --         none
 D3-63      945L Jenner 275S to Amoco Empress 163S                                 none                          --         none
 D3-64      N. Lethbridge 370S 240/138 kV transformer T3                           none                          --         none
 D3-65      W. Brooks 28S 240/138 kV transformer T1                                none                          --         none
 D3-66      Amoco Empress 163S 240/138 kV transformer                              none                          --         none
 D3-67      172L Bullshead 523S to Medicine Hat 41S                                none                          --         none
 D3-68      100L Brooks 121S to Tilley 498S                                        none                          --         none
 D3-69      172L Taber 83S to Fincastle 336S                                       none                          --         none
 D3-70      172L Coaldale 254S to Taber 83S                                        none                          --         none
 D3-71      763L West Brooks 28S to Vauxhall 158S                                  none                          --         none
 D3-72      795L Brooks 121S to Hays 421S                      763L West Brooks 28S to Enchant Junction        95%          none
 D3-73      814L West Brooks 28S to Brooks 121S                                    none                          --         none
 D3-74      760L Empress 163S to Chappice Lake 649S                                none                          --         none
 D3-75      New Hays 421S to Redcliff (new) 138 kV line                            none                          --         none
 D3-76      100L Redcliff (new) to Medicine Hat 41S                                none                          --         none
 D3-77      100L Redcliff (new) to Suffield 895S                                   none                          --         none
 D3-78      207L N. Lethbridge 370S to Lethbridge 111S                             none                          --         none
 D3-79      823L Macdonald 146S to Lakeview 593S                                   none                          --         none


                                                      Alberta Electric System Operator
Draft for Discussion                                                 D-3-8                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Table D3–6: Summary of Alt-VM-3 Contingency Analysis: Sensitivity Case 2 – Increased Medicine Hat DTS (2012 Summer
           Peak, Zero Alberta-Saskatchewan Interchange, Zero Area Wind Generation)

                                    Outage                                   Overloaded Element                    Percent        Other System
                                                                                                                   Loading        Performance
                                                                                                                                   Concerns




   Figure No.
 D3-80          All Elements in Service                         Voltages in the Medicine Hat area are depressed due to the increase load as well
                                                                as due to the reduction of reactive power support from offline Medicine Hat
                                                                generators. A total of 40 MVAr in reactive power compensation in side the Medicine
                                                                Hat system is assumed to maintain acceptable voltages.
 D3-81          924L/935L West Brooks 28S To Lethbridge                              none                              --             none
                370S to Langdon 102S
 D3-82          944L Ware Junction 132S to Jenner 275S                               none                              --             none
 D3-83          945L Jenner 275S to Amoco Empress 163S                               none                              --             none
 D3-84          N. Lethbridge 370S 240/138 kV transformer T3                         none                              --             none
 D3-85          W. Brooks 28S 240/138 kV transformer T1                              none                              --             none
 D3-86          Amoco Empress 163S 240/138 kV transformer                            none                              --             none
 D3-87          172L Bullshead 523S to Medicine Hat 41S                              none                              --             none
 D3-88          100L Brooks 121S to Tilley 498S                                      none                              --             none
 D3-89          172L Taber 83S to Fincastle 336S                100L Brooks 121S to Tilley 498S                       92%      138 and 25 kV
                                                                100L Redcliff (new) to Medicine Hat 41S              105%      Voltages in the
                                                                                                                               Fincastle 336S
                                                                                                                               area drop by 10
                                                                                                                               percent and below
                                                                                                                               0.9 p.u.
 D3-90          172L Coaldale 254S to Taber 83S                                      none                              --             none
 D3-91          763L West Brooks 28S to Vauxhall 158S                                none                              --             none
 D3-92          795L Brooks 121S to Hays 421S                                        none                              --             none
 D3-93          814L West Brooks 28S to Brooks 121S                                  none                              --             none
 D3-94          760L Empress 163S to Chappice Lake 649S         100L Redcliff (new) to Medicine Hat 41S               94%             none
 D3-95          New Hays 421S to Redcliff (new) 138 kV line                          none                              --             none



                                                        Alberta Electric System Operator
Draft for Discussion                                                     D-3-9                                                          June 6, 2007
                                Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                       Outage                                    Overloaded Element                 Percent     Other System
                                                                                                                    Loading     Performance
                                                                                                                                 Concerns




      Figure No.
 D3-96             100L Redcliff (new) to Medicine Hat 41S         760L Empress 163S to Chappice Lake 649S            98%           none
                                                                   760L Chappice Lake 649S to Medicine Hat 41S        92%
 D3-97             100L Redcliff (new) to Suffield 895S                                  none                             --        none
 D3-98             207L N. Lethbridge 370S to Lethbridge 111S                            none                             --        none
 D3-99             823L Macdonald 146S to Lakeview 593S                                  none                             --        none



Table D3–7: Summary of Alt-VM-3 Contingency Analysis – Sensitivity Case 3 (2012 Summer Minimum, Zero Alberta-
           Saskatchewan Interchange, Maximum Area Generation)

                                    Outage (1)                                 Overloaded Element                 Percent       Other System
                                                                                                                  Loading       Performance
                                                                                                                                 Concerns




  Figure No.
D3-100             All Elements in Service                                            None                           --            none
D3-101             172L Taber 83S to Fincastle 336S               172L Medicine Hat 41S to Bullshead 523S          121%            none
                                                                  100L Redcliff (new) to Medicine Hat 41S           95%
D3-102             172L Bullshead 523S to Burdett 368S                                None                           --            none
D3-103             172L Medicine Hat 41S to Bullshead 523S        172L Taber 83S to Fincastle 336S                 125%            none
D3-104             760L Medicine Hat 41S to Chappice Lake         100L Redcliff (new) to Medicine Hat 41S          101%            none
                   649S
D3-105             New Hays 421S to Redcliff (new) 138 kV line                         none                          --            none
D3-106             100L Redcliff (new) to Medicine Hat 41S        760L Medicine Hat 41S to Chappice Lake 649S      112%            none
                                                                  760L Chappice Lake 649S Empress 394S             110%
D3-107             100L Redcliff (new) to Suffield 895S                                none                          --            none




                                                             Alberta Electric System Operator
Draft for Discussion                                                        D-3-10                                                   June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix E:            Part A – Transient Stability Analysis




                             Alberta Electric System Operator
Draft for Discussion                            E-1                                   June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            E-2                                   June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix F:            Part A – Cost Estimates




                             Alberta Electric System Operator
Draft for Discussion                            F-1                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            F-2                                June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix G:            Part B – Recommended Development




                             Alberta Electric System Operator
Draft for Discussion                           G-1                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           G-2                                 June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure G-1 Recommended Part B transmission development
                                                 To Anderson 801S &                                                                                                      To Oyen
                                             Sheerness Generating Station                                                                                                 767S
                                                                    9L934/




                                                                                                                                                                                   7L760/760L
                                                         933L       9L950
               N                    Brooks                         Ware Junction                                         Wardlow
                                                                                                                                                              Empress Liquids
                                                                                                                                                                    164S
                                                                      132S                                                230S                                          760AL                    Amoco
                                           Bassano                                                                                                          Sandy Point   869                   Empress
                                            435S                  931L                                                                                                        L
                                                                                                                                                               204S                               163S
                                                                         Duchess                                              Jenner                                       760L
                                                                                                                                                                Empress
                                                                                                         951L                  275S
                                                                          339S                                                                                    394S     871L
                                                                                                         944L                               945L           Wind Farm
                         To Queenstown                                      Cutting Lake                                                                                   Sand Hills 830L
                                                    853L                                                                                                   Project 590
                             504S                                              227S                                                                                          341S
                                                                  814L                                                                                       99 MW
                                  935L
                                                                  827
                                                                                              Tilley                                                 Wind Farm                   McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                   L
                                                             W. Brooks
                                                                28S
                                                                       Brooks
                                                                        121S                  498S                   Empress                         Project 617
                                                                                                                                                      100 MW
                                                                                                                                                                               Convertor
                                                                                                                                                                              Station 840S
                               2x525 MW                                                           100L
                               (proposed)
                                           763A
                                                                            795L


                                             L                                                                    Suffield
                                   Enchant                                                                         895S                  Chappice Lake              760L
                                     447S                                                                                                    649S
                                                          763L




                                                                                                                                 100L
                                                                                      Alternative B-2                           (892L)
                                                                                       Hays
                                                  Vauxhall        821L                 421S
                                                   158S
                      924L

                             923L




                                                                                                                                                 Medicine Hat

                                                                            Vauxhall                                                                41S


                                                                                                                 172L
                                                                                                                                           172L (880L)
                                                                                                                                           Bullshead
                                                                                                                                                                   Medicine
                                Coaldale                           172L             172L Burdett
         Monarch
          492S
                                 254S
                                                 172L
                                                                  (610L)           (612L) 368S                  (879L)
                                                                                                                                   New
                                                                                                                                             523S
                                                                                                                                          N.O.


                                                                                                                                           600L
                                                                                                                                                                     Hat
                                                        Taber                                                   Wind Farm        Bullshead
                                                                            N.O.                                                                Wind Farm
                                                                                                                Project 534
                                                                                                     2L




                                                         83S New                                                                                Project 513
      172L                          820L                                                                          75 MW
                                                                                                   72




                                                           Fincastle
                                                    Chin Chute                       Taber Wind                                                  128 MW
  N. Lethbridge       L
                   734241S                                                              Farm
                                                                   (607L)
                                                                   172AL




                                                    Wind 30MW                                                                 Seven Persons Peace Butte                    Wild Rose
      370S 207L
                       813L                      Chin Chute
                                                                                       80MW              Westfield             Wind Farm       404S                        Wind Farm
                111S 146S                                                                                 107S
     725L              823L                      IPP 11MW                           Wind Farm                                    120 MW                                     200 MW
                                                                                                  Alternative B-3
                  L




                       Lakeview
                  725A




   Lethbridge                                                                       Project 514
                         593S                                        Conrad
                                           66L




      674S                                                                           102 MW
                      824L                                            135S                               Note: Line numbers in barckets denote new line numbers
       Riverbend
        618S          Lethbridge
                                                                                                                138 kV
               863L




                                       To                                                                                                            Thermal Plant
                                     Stirling
                                      67S                                                                       240 kV
                                                                                                                                                     Wind Farm
            To                                                                                                  Planned
          Magrath                                                                                                                                    Proposed Wind Farm
           225S


                   To                                                                                      Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)                                                                               Transmission facilities in Part B




                                                                 Alberta Electric System Operator
Draft for Discussion                                                                                   G-3                                                               June 6, 2007
                                      Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                                                                                                                                                                         931L to
                                                                               763L to 853L to          814L to                            933L to
                                                                                                                                                                                                          132S
                                                                                158S 504S                121S                            801S (ATCO)


                                                                      138kV                                                                                                    240kV


                                                                                                                               T1
                                                                                                                           245/144 kV
          T3
                                                                                                                        120/160/200 MVA
      138/24.9kV
     15/20/25 MVA

                                                                                                                                                                                                                  R1
                                                                                                                                                                                                               50MVAr 3φ

                           VR3
                          24.9kV
                       15/20/25 MVA
                                                                                                                                T2
                                                                                                                            245/144 kV
         25kV                                                                                                            120/160/200 MVA
                                            Standby
                                           AC Supply                  138kV                                                                                        240kV
                                                                                                                                                                                 New 240kV line to
                                                     AC Station                                                                                                                   Fincastle Area
                                                      Service


        2057L    2056L     2255L
                                                                                         827L to                                                          935L to             923L to         New 240 kV line to
                                                                                          121S                                                         Milo Junction       Milo Junction       Bullshead Area




     LEGEND:
                                            Faulting Switch       Transfor                           Fuse                    Regulator                    Proposed West Brooks 28S Development
             Substation Fence
                                                                  mer

                Motorized Air Break          Circuit Breaker      Generation                        Disconnect Switch          Transfer Switch                                      Figure G-2
                AutoTransformer              Capacitor Bank        Motorized air break             Underground                 Proposed Development
                                                                   with arcing horn




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                G-4                                                                                    June 6, 2007
                              Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                                                             N.O
                                         240kV
                                                                                                                                      138kV


                                                                                240/138 kV
                                               240 kV line                240/1320/400 MVA LTC
                                               from North                                                       607 L In    607 L Out to
                                                                                                                  from         135 S
                                                                                                                  336S        Conrad
                                                                                                                Finacstle




      LEGEND:                                                                                                                 New Fincastle Area Substation
                                             Faulting              Transformer                   Fuse
                Substation Fence
                                              Switch
                 Motorized Air Break       Circuit Breaker         Generation                    Disconnect Switch                         Figure G-3
                 AutoTransformer           Capacitor Bank           Motorized air break      Proposed Development
                                                                    with arcing horn



                                                             Alberta Electric System Operator
Draft for Discussion                                                                G-5                                                          June 6, 2007
                                          Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                                                                                                          600L




                                          880L to Medicine Hat
                                                                                                         T1
                                                                                                      138/24.94
                                                                                                     15/20/25/28
                                                                     138kV Bus                                       To 25 kV Bus




                                   C1
                              18.3 MVAR
                                                                           172L to Burdett


                                                                                                                                    N.O
                                                                                                                   138kV

                                                                                                                                              240kV
                                                                                                                                                                         40 MVAr

                                                                                                                                                      240 kV line
                                                                                                      600L to                                         from North
                                                                                                    Peace Butte                                         or West
                                                                                                       404S
Legend
         Circuit Breaker                                                LTC transformer
                                                                                                                                                       New Bullshead Area Substation
         Potential Transformer
                                                                        Regulator
         Ganged Air-Switch
         (Motor-operated)                                        1      Parallel break capability                                                                   Figure G-4
         Ganged Air-Switch
         (Manual Operation)                                             Proposed Development

         Hookstick Operated 1ph.                                        Salvage
         Disconnect Switch (Solid)




                                                                                                           Alberta Electric System Operator
Draft for Discussion                                                                                                          G-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H:            Part B – Alternative Analysis




                             Alberta Electric System Operator
Draft for Discussion                           H-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-1-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-1: Alternative B-2a




                             Alberta Electric System Operator
Draft for Discussion                           H-1-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-1-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure H1-1                  Alternative B-2a

                                                  To Anderson 801S &                                                                                                        To Oyen
                                               Sheerness Generating Station                                                                                                  767S
                                                                       9L934/




                                                                                                                                                                                      7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction                                          Wardlow
                                                                                                                                                                 Empress Liquids
                                                                                                                                                                       164S
                                                                         132S                                                 230S                                         760AL                    Amoco
                                            Bassano                                                                                                            Sandy Point   869                   Empress
                                             435S                   931L                                                                                                         L
                                                                                                                                                                  204S                               163S
                                                                            Duchess                                              Jenner                                       760L
                                                                                                                                                                   Empress
                                                                                                            951L                  275S
                                                                             339S                                                                                    394S     871L
                                                                                                            944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                    Sand Hills 830L
                                                     853L                                                                                                     Project 590
                              504S                                                227S                                                                                           341S
                                                                    814L                                                                                        99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                 Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                         Project 617
                                                                                                                                                         100 MW
                                                                                                                                                                                   Convertor
                                                                                                                                                                                  Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                                                               795L


                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                  Chappice Lake               760L
                                        447S                                                                                                    649S
                                                           763L




                                                                                                                                    100L
                                                                                                                                   (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                    Medicine Hat

                                                                               Vauxhall                                                                41S


                                                                                                                    172L
                                                                                                                                               172L (880L)
                                                                                                                                              Bullshead
                                                                                                                                                                      Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                  (879L)
                                                                                                                                      New
                                                                                                                                                523S
                                                                                                                                             N.O.


                                                                                                                                              600L
                                                                                                                                                                        Hat
                                                         Taber                                                     Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                   Wind Farm
                                                                                                                   Project 534
                                                                                                        2L




                                                          83S New                                                                                  Project 513
      172L                           820L                                                                            75 MW
                                                                                                      72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                  128 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      (607L)
                                                                      172AL




                      241S           Wind 30MW                                                                                   Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                 107S
     725L              823L         11MW                                               Wind Farm                                    120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad
                                            66L




      674S                                                                              102 MW
                      824L                                               135S                             Note: Line numbers in barckets denote new line numbers
       Riverbend
        618S          Lethbridge                                                                                   138 kV                               Thermal Plant
               863L




                                         To
                                       Stirling                                                                    240 kV
                                        67S
                                                                                                                                                        Wind Farm
                                                                                                                   Planned
            To                                                                                                                                          Proposed Wind Farm
          Magrath
           225S


                   To
                                                                                                              Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)                                                                                  Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                  H-1-3                                                                        June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



 Table H1–1: Summary of Alt-B-2a Contingency Analysis Results – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                           Saskatchewan, Maximum Area Generation)

                                   Outage                                  Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
H1-2           All Elements in Service                                               --                           --             none
                                                                                                      (1)
H1-3           923L/927L West Brooks 28S to Langdon 102S to     853L West Brooks 28S to Bassano Tap             107%             none
               North Lethbridge 370S
H1-4           9L59 Anderson 801S to Cordel 755S                853L West Brooks 28S to Bassano Tap(1)          103%             none
H1-5           172L Taber 83S to Fincastle 336S                                    None                           --             none
H1-6           172L Bullshead 523S to Burdett 368S                                 None                           --             none
H1-7           172L Medicine Hat 41S to Bullshead 523S                             None                           --             none
H1-8           100L Medicine Hat 41S to Suffield 895S                              None                           --             none
H1-9           760L Medicine Hat 41S to Chappice Lake 649S                         None                           --             none
H1-10          New Hays 401S to Burdett 368S                                       None                           --             none
H1-11          New West Brooks 28S to Fincastle 240 kV line                        None                           --             none
H1-12          New West Brooks 28S to Bullshead 240 kV line                        None                           --             none

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-1-4                                                     June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H1–2: Summary of Alt-B-2a Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import
           from Saskatchewan, Maximum Area Generation)

                                    Outage                                     Overloaded Element                    Percent          Other System
                                                                                                                     Overload         Performance
                                                                                                                                       Concerns




  Figure No.
H1-13          All Elements in Service                             853L West Brooks 28S to Bassano Tap(1)(2)           108%               none
                                                                                                           (1)(2)
                                                                   853L Bassano Tap to Queenstown 504S                 101%
                                                                                                          (1)(2)
H1-14          923L/927L West Brooks 28S to Langdon 102S to        853L West Brooks 28S to Bassano Tap                 133%               none
               North Lethbridge 370S
                                                                   853L Bassano Tap to Queenstown 504S(1)(2)           125%
H1-15          9L59 Anderson 801S to Cordel 755S                   760L Amoco Empress 163S to Empress                  109%               none
                                                                   Liquids Tap(3)
                                                                   853L West Brooks 28S to Bassano Tap(1)(2)           124%
                                                                                                           (1)(2)
                                                                   853L Bassano Tap to Queenstown 504S                 116%
H1-16          172L Taber 83S to Fincastle 336S                                        None                              --               none
H1-17          172L Bullshead 523S to Burdett 368S                                     None                              --               none
H1-18          172L Medicine Hat 41S to Bullshead 523S                                 None                              --               none
H1-19          100L Medicine Hat 41S to Suffield 895S                                  None                              --               none
H1-20          760L Medicine Hat 41S to Chappice Lake 649S                             None                              --               none
H1-21          New Hays 401S to Burdett 368S                                           None                              --               none
H1-22          New West Brooks 28S to Fincastle 240 kV line                            None                              --               none
H1-23          New West Brooks 28S to Bullshead 240 kV line                            None                              --               none

          (1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.

          (2) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (3) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.


                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-1-5                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-1-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-2: Alternative B-2b




                             Alberta Electric System Operator
Draft for Discussion                           H-2-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-2-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure H2-1 Alternative B-2b
                                                  To Anderson 801S &                                                                                                        To Oyen
                                               Sheerness Generating Station                                                                                                  767S
                                                                       9L934/




                                                                                                                                                                                      7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction                                          Wardlow
                                                                                                                                                                 Empress Liquids
                                                                                                                                                                       164S
                                                                         132S                                                 230S                                         760AL                    Amoco
                                            Bassano                                                                                                            Sandy Point   869                   Empress
                                             435S                   931L                                                                                                         L
                                                                                                                                                                  204S                               163S
                                                                            Duchess                                              Jenner                                       760L
                                                                                                                                                                   Empress
                                                                                                            951L                  275S
                                                                             339S                                                                                    394S     871L
                                                                                                            944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                    Sand Hills 830L
                                                     853L                                                                                                     Project 590
                              504S                                                227S                                                                                           341S
                                                                    814L                                                                                        99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                 Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                         Project 617
                                                                                                                                                         100 MW
                                                                                                                                                                                   Convertor
                                                                                                                                                                                  Station 840S
                               2x525 MW                                                              100L
                               (proposed)                                      795L
                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                  Chappice Lake               760L
                                        447S                                                                                                    649S
                                                           763L




                                                                                                                                    100L
                                                                                                                                   (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                    Medicine Hat

                                                                               Vauxhall                                                                41S


                                                                                                                    172L
                                                                                                                                               172L (880L)
                                                                                                                                              Bullshead
                                                                                                                                                                      Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                  (879L)
                                                                                                                                      New
                                                                                                                                                523S
                                                                                                                                             N.O.


                                                                                                                                              600L
                                                                                                                                                                        Hat
                                                         Taber                                                     Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                   Wind Farm
                                                                                                                   Project 534
                                                                                                        2L




                                                          83S New                                                                                  Project 513
      172L                           820L                                                                            75 MW
                                                                                                      72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                  128 MW
  N. Lethbridge       L
                   734241S                                                                Farm
                                                                      (607L)
                                                                      172AL




                                     Wind 30MW                                                                                   Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                 107S
     725L              823L         11MW                                               Wind Farm                                    120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad
                                            66L




      674S                                                                              102 MW
                      824L                                               135S                             Note: Line numbers in barckets denote new line numbers
       Riverbend
        618S          Lethbridge                                                                                   138 kV                               Thermal Plant
               863L




                                         To
                                       Stirling                                                                    240 kV
                                        67S
                                                                                                                                                        Wind Farm
                                                                                                                   Planned
            To                                                                                                                                          Proposed Wind Farm
          Magrath
           225S


                   To
                                                                                                              Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)                                                                                  Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                  H-2-3                                                                        June 6, 2007
                            Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



 Table H2–1: Summary of Alt-B-2b Contingency Analysis Results – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                           Saskatchewan, Maximum Area Generation)

                                   Outage                                 Overloaded Element                  Percent        Other System
                                                                                                              Overload       Performance
                                                                                                                              Concerns




  Figure No.
H2-2           All Elements in Service                                              --                           --              none
                                                                                                     (1)
H2-3           923L/927L West Brooks 28S to Langdon 102S       853L West Brooks 28S to Bassano Tap             108%              none
               to North Lethbridge 370S
H2-4           9L59 Anderson 801S to Cordel 755S               853L West Brooks 28S to Bassano Tap(1)          103%              none
H2-5           172L Taber 83S to Fincastle 336S                                   None                           --              none
H2-6           172L Bullshead 523S to Burdett 368S                                None                           --              none
H2-7           172L Medicine Hat 41S to Bullshead 523S                            None                           --              none
H2-8           100L Medicine Hat 41S to Suffield 895S                             None                           --              none
H2-9           760L Medicine Hat 41S to Chappice Lake 649S                        None                           --              none
H2-10          New Hays 401S to Burdett 368S                                      None                           --              none
H2-11          New West Brooks 28S to Fincastle 240 kV line                       None                           --              none
H2-12          New West Brooks 28S to Bullshead 240 kV line                       None                           --              none

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                        Alberta Electric System Operator
Draft for Discussion                                                    H-2-4                                                      June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H2–2: Summary of Alt-B-2b Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import
           from Saskatchewan, Maximum Area Generation)

                                    Outage                                     Overloaded Element                    Percent          Other System
                                                                                                                     Overload         Performance
                                                                                                                                       Concerns




  Figure No.
H2-13          All Elements in Service                             853L West Brooks 28S to Bassano Tap(1)(2)           109%               none
                                                                                                           (1)(2)
                                                                   853L Bassano Tap to Queenstown 504S                 101%
                                                                                                          (1)(2)
H2-14          923L/927L West Brooks 28S to Langdon 102S to        853L West Brooks 28S to Bassano Tap                 134%               none
               North Lethbridge 370S
                                                                   853L Bassano Tap to Queenstown 504S(1)(2)           126%
H2-15          9L59 Anderson 801S to Cordel 755S                   760L Amoco Empress 163S to Empress                  109%               none
                                                                   Liquids Tap(3)
                                                                   853L West Brooks 28S to Bassano Tap(1)(2)           125%
                                                                                                           (1)(2)
                                                                   853L Bassano Tap to Queenstown 504S                 117%
H2-16          172L Taber 83S to Fincastle 336S                                        None                              --               none
H2-17          172L Bullshead 523S to Burdett 368S                                     None                              --               none
H2-18          172L Medicine Hat 41S to Bullshead 523S                                 None                              --               none
H2-19          100L Medicine Hat 41S to Suffield 895S                                  None                              --               none
H2-20          760L Medicine Hat 41S to Chappice Lake 649S                             None                              --               none
H2-21          New Hays 401S to Burdett 368S                                           None                              --               none
H2-22          New West Brooks 28S to Fincastle 240 kV line                            None                              --               none
H2-23          New West Brooks 28S to Bullshead 240 kV line                            None                              --               none

          (4) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.

          (5) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (6) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.


                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-2-5                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-2-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-3: Alternative B-3a




                             Alberta Electric System Operator
Draft for Discussion                           H-3-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-3-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation


Figure H3-1 Alternative B-3a
                                                  To Anderson 801S &                                                                                                         To Oyen
                                               Sheerness Generating Station                                                                                                   767S
                                                                       9L934/




                                                                                                                                                                                       7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                                  Empress Liquids
                                                                                                                                                                        164S
                                                                         132S                                                                                               760AL
                                                                                                                              230S                                                                   Amoco
                                            Bassano                                                                                                             Sandy Point   869                   Empress
                                             435S                   931L                                                                                                          L
                                                                                                                                                                   204S                               163S
                                                                            Duchess                                               Jenner                                       760L
                                                                                                                                                                    Empress
                                                                                                             951L                  275S
                                                                             339S                                                                                     394S     871L
                                                                                                             944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                     Sand Hills 830L
                                                     853L                                                                                                      Project 590
                              504S                                                227S                                                                                            341S
                                                                    814L                                                                                         99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                  Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                    Empress                         Project 617
                                                                                                                                                          100 MW
                                                                                                                                                                                    Convertor
                                                                                                                                                                                   Station 840S
                               2x525 MW                                                               100L
                               (proposed)                                      795L
                                          763AL                                                                       Suffield
                                       Enchant                                                                         895S                  Chappice Lake               760L
                                        447S                                                                                                     649S
                                                           763L




                                                                                                                                     100L
                                                                                                                                    (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                     Medicine Hat

                                                                               Vauxhall                                                                 41S


                                                                                                                     172L
                                                                                                                                                172L (880L)
                                                                                                                                               Bullshead
                                                                                                                                                                       Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)
                                                                                                                                       New
                                                                                                                                                 523S
                                                                                                                                              N.O.


                                                                                                                                               600L
                                                                                                                                                                         Hat
                                                         Taber                                                      Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                    Wind Farm
                                                                                                                    Project 534
                                                                                                        2L




                                                          83S New                                                                                   Project 513
      172L                           820L                                                                             75 MW
                                                                                                          72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                   128 MW
  N. Lethbridge       L
                   734241S                                                                Farm
                                                                      (607L)
                                                                      172AL




                                     Wind 30MW                                                                                    Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW               Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                  107S
     725L              823L         11MW                                               Wind Farm                                     120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad
                                            66L




      674S                                                                              102 MW
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                     Note: Line numbers in barckets denote new line numbers

                                                                                                                138 kV
               863L




                                         To                                                                                                            Thermal Plant
                                       Stirling
                                        67S                                                                     240 kV
                                                                                                                                                       Wind Farm
            To                                                                                                  Planned
          Magrath                                                                                                                                       Proposed Wind Farm
           225S


                   To                                                                                        Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)
                                                                                                             Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                    H-3-3                                                                       June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



 Table H3–1: Summary of Alt-B-3a Contingency Analysis Results – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                           Saskatchewan, Maximum Area Generation)

                                   Outage                                  Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
H3-2           All Elements in Service                                               --                           --             none
                                                                                                      (1)
H3-3           923L/927L West Brooks 28S to Langdon 102S to     853L West Brooks 28S to Bassano Tap             107%             none
               North Lethbridge 370S
H3-4           9L59 Anderson 801S to Cordel 755S                853L West Brooks 28S to Bassano Tap(1)          102%             none
H3-5           172L Taber 83S to Fincastle 336S                                    None                           --             none
H3-6           172L Bullshead 523S to Burdett 368S                                 None                           --             none
H3-7           172L Medicine Hat 41S to Bullshead 523S                             None                           --             none
H3-8           100L Medicine Hat 41S to Suffield 895S                              None                           --             none
H3-9           760L Medicine Hat 41S to Chappice Lake 649S                         None                           --             none
H3-10          New Hays 401S to Burdett 368S                                       None                           --             none
H3-11          New West Brooks 28S to Fincastle 240 kV line     New West Brooks 28S to Fincastle 240 kV          98%             none
                                                                line
H3-12          New Fincastle to Bullshead 240 kV line                              None                           --             none

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-3-4                                                     June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H3–2: Summary of Alt-B-3a Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import
           from Saskatchewan, Maximum Area Generation)

                                    Outage                                     Overloaded Element                    Percent          Other System
                                                                                                                     Overload         Performance
                                                                                                                                       Concerns




  Figure No.
H3-13           All Elements in Service                           853L West Brooks 28S to Bassano Tap(1)(2)            108%               none
                                                                                                          (1)(2)
                                                                  853L Bassano Tap to Queenstown 504S                  101%
                                                                                                         (1)(2)
H3-14           923L/927L West Brooks 28S to Langdon 102S         853L West Brooks 28S to Bassano Tap                  133%               none
                to North Lethbridge 370S
                                                                  853L Bassano Tap to Queenstown 504S(1)(2)            125%
H3-15           9L59 Anderson 801S to Cordel 755S                 760L Amoco Empress 163S to Empress                   109%               none
                                                                  Liquids Tap(3)
                                                                  853L West Brooks 28S to Bassano Tap(1)(2)            124%
                                                                                                          (1)(2)
                                                                  853L Bassano Tap to Queenstown 504S                  116%
H3-16           172L Taber 83S to Fincastle 336S                                       None                              --               none
H3-17           172L Bullshead 523S to Burdett 368S                                    None                              --               none
H3-18           172L Medicine Hat 41S to Bullshead 523S                                None                              --               none
H3-19           100L Medicine Hat 41S to Suffield 895S                                 None                              --               none
H3-20           760L Medicine Hat 41S to Chappice Lake                                 None                              --               none
                649S
H3-21           New Hays 401S to Burdett 368S                                          None                              --               none
H3-22           New West Brooks 28S to Fincastle 240 kV line      New West Brooks 28S to Fincastle 240 kV line         98%                none
H3-23    New Fincastle to Bullshead 240 kV line                               None                               --               none
   (1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
       and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.
          (2) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported
          (3) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.


                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-3-5                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-3-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-4: Alternative B-3b




                             Alberta Electric System Operator
Draft for Discussion                           H-4-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-4-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure H4-1 Alternative B-3b
                                                  To Anderson 801S &                                                                                                         To Oyen
                                               Sheerness Generating Station                                                                                                   767S
                                                                       9L934/




                                                                                                                                                                                       7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction
                                                                                                                             Wardlow
                                                                                                                                                                  Empress Liquids
                                                                                                                                                                        164S
                                                                         132S                                                                                               760AL
                                                                                                                              230S                                                                   Amoco
                                            Bassano                                                                                                             Sandy Point   869                   Empress
                                             435S                   931L                                                                                                          L
                                                                                                                                                                   204S                               163S
                                                                            Duchess                                               Jenner                                       760L
                                                                                                                                                                    Empress
                                                                                                             951L                  275S
                                                                             339S                                                                                     394S     871L
                                                                                                             944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                     Sand Hills 830L
                                                     853L                                                                                                      Project 590
                              504S                                                227S                                                                                            341S
                                                                    814L                                                                                         99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                  Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                    Empress                         Project 617
                                                                                                                                                          100 MW
                                                                                                                                                                                    Convertor
                                                                                                                                                                                   Station 840S
                               2x525 MW                                                               100L
                               (proposed)
                                                                               795L

                                          763AL                                                                       Suffield
                                       Enchant                                                                         895S                  Chappice Lake               760L
                                        447S                                                                                                     649S
                                                           763L




                                                                                                                                     100L
                                                                                                                                    (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                     Medicine Hat

                                                                               Vauxhall                                                                 41S


                                                                                                                     172L
                                                                                                                                                172L (880L)
                                                                                                                                               Bullshead
                                                                                                                                                                       Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                   (879L)
                                                                                                                                       New
                                                                                                                                                 523S
                                                                                                                                              N.O.


                                                                                                                                               600L
                                                                                                                                                                         Hat
                                                         Taber                                                      Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                    Wind Farm
                                                                                                                    Project 534
                                                                                                        2L




                                                          83S New                                                                                   Project 513
      172L                           820L                                                                             75 MW
                                                                                                          72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                   128 MW
  N. Lethbridge       L
                   734241S                                                                Farm
                                                                      (607L)
                                                                      172AL




                                     Wind 30MW                                                                                    Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW               Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                  107S
     725L              823L         11MW                                               Wind Farm                                     120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad
                                            66L




      674S                                                                              102 MW
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                     Note: Line numbers in barckets denote new line numbers

                                                                                                                138 kV
               863L




                                         To                                                                                                            Thermal Plant
                                       Stirling
                                        67S                                                                     240 kV
                                                                                                                                                       Wind Farm
            To                                                                                                  Planned
          Magrath                                                                                                                                       Proposed Wind Farm
           225S


                   To                                                                                        Transmission facilities in Part A
           Great Falls, Montana
             (merchant line)
                                                                                                             Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                    H-4-3                                                                       June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



 Table H4–1: Summary of Alt-B-3b Contingency Analysis Results – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                           Saskatchewan, Maximum Area Generation)

                                   Outage                                  Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
H4-2           All Elements in Service                                              --                            --             none
                                                                                                     (1)
H4-3           923L/927L West Brooks 28S to Langdon 102S       853L West Brooks 28S to Bassano Tap              107%             none
               to North Lethbridge 370S
H4-4           9L59 Anderson 801S to Cordel 755S               853L West Brooks 28S to Bassano Tap(1)           103%             none
H4-5           172L Taber 83S to Fincastle 336S                                   None                            --             none
H4-6           172L Bullshead 523S to Burdett 368S                                None                            --             none
H4-7           172L Medicine Hat 41S to Bullshead 523S                            None                            --             none
H4-8           100L Medicine Hat 41S to Suffield 895S                             None                            --             none
H4-9           760L Medicine Hat 41S to Chappice Lake 649S                        None                            --             none
H4-10          New Hays 401S to Burdett 368S                                      None                            --             none
H4-11          New West Brooks 28S to Fincastle 240 kV line                       None                            --             none
H4-12          New Fincastle to Bullshead 240 kV line                             None                            --             none

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-4-4                                                     June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H4–2: Summary of Alt-B-3b Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import
           from Saskatchewan, Maximum Area Generation)

                                   Outage                                      Overloaded Element                    Percent          Other System
                                                                                                                     Overload         Performance
                                                                                                                                       Concerns




  Figure No.
H4-13          All Elements in Service                            853L West Brooks 28S to Bassano Tap(1)(2)            109%               none
                                                                                                          (1)(2)
                                                                  853L Bassano Tap to Queenstown 504S                  101%
                                                                                                         (1)(2)
H4-14          923L/927L West Brooks 28S to Langdon 102S          853L West Brooks 28S to Bassano Tap                  134%               none
               to North Lethbridge 370S
                                                                  853L Bassano Tap to Queenstown 504S(1)(2)            126%
H4-15          9L59 Anderson 801S to Cordel 755S                  760L Amoco Empress 163S to Empress                   110%               none
                                                                  Liquids Tap(3)
                                                                  853L West Brooks 28S to Bassano Tap(1)(2)            124%
                                                                                                          (1)(2)
                                                                  853L Bassano Tap to Queenstown 504S                  117%
H4-16          172L Taber 83S to Fincastle 336S                                        none                              --               none
H4-17          172L Bullshead 523S to Burdett 368S                                     none                              --               none
H4-18          172L Medicine Hat 41S to Bullshead 523S                                 none                              --               none
H4-19          100L Medicine Hat 41S to Suffield 895S                                  none                              --               none
H4-20          760L Medicine Hat 41S to Chappice Lake 649S                             none                              --               none
H4-21          New Hays 401S to Burdett 368S                                           none                              --               none
H4-22          New West Brooks 28S to Fincastle 240 kV line                            none                              --               none
H4-23          New Fincastle to Bullshead 240 kV line                                  none                              --               none

          (4) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.

          (5) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (6) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.


                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-4-5                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-4-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-5: Alternative B-4




                             Alberta Electric System Operator
Draft for Discussion                           H-5-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-5-2                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure H5-1 Alternative B-4
                                                  To Anderson 801S &                                                                                                        To Oyen
                                               Sheerness Generating Station                                                                                                  767S
                                                                       9L934/




                                                                                                                                                                                      7L760/760L
                                                          933L         9L950
               N                    Brooks                            Ware Junction                                         Wardlow
                                                                                                                                                                 Empress Liquids
                                                                                                                                                                       164S
                                                                         132S                                                230S
                                                                                                                                                                           760AL                    Amoco
                                            Bassano                                                                                                            Sandy Point   869                   Empress
                                             435S                   931L                                                                                                         L
                                                                                                                                                                  204S                               163S
                                                                            Duchess                                              Jenner                                       760L
                                                                                                                                                                   Empress
                                                                                                            951L                  275S
                                                                             339S                                                                                    394S     871L
                                                                                                            944L                               945L           Wind Farm
                          To Queenstown                                        Cutting Lake                                                                                    Sand Hills 830L
                                                     853L                                                                                                     Project 590
                              504S                                                227S                                                                                           341S
                                                                    814L                                                                                        99 MW
                                   935L
                                                                      827L Brooks                Tilley                                                 Wind Farm                    McNeill
                                   923L
                                Bow City
                             Generating Plant
                                                                  W. Brooks
                                                                     28S
                                                                            121S                 498S                   Empress                         Project 617
                                                                                                                                                         100 MW
                                                                                                                                                                                   Convertor
                                                                                                                                                                                  Station 840S
                               2x525 MW                                                              100L
                               (proposed)
                                                                               795L

                                          763AL                                                                      Suffield
                                       Enchant                                                                        895S                  Chappice Lake               760L
                                        447S                                                                                                    649S
                                                           763L




                                                                                                                                    100L
                                                                                                                                   (892L)
                                                                                          Hays
                                                   Vauxhall          821L                 421S
                                                    158S
                      924L

                             923L




                                                                                                                                                    Medicine Hat

                                                                               Vauxhall                                                                41S


                                                                                                                    172L
                                                                                                                                               172L (880L)
                                                                                                                                              Bullshead
                                                                                                                                                                      Medicine
                                    Coaldale                          172L             172L Burdett
         Monarch
          492S
                                     254S
                                                  172L
                                                                     (610L)           (612L) 368S                  (879L)
                                                                                                                                      New
                                                                                                                                                523S
                                                                                                                                             N.O.


                                                                                                                                              600L
                                                                                                                                                                        Hat
                                                         Taber                                                     Wind Farm        Bullshead
                                                                               N.O.
                                                                                                                                                   Wind Farm
                                                                                                                   Project 534
                                                                                                        2L




                                                          83S New                                                                                  Project 513
      172L                           820L                                                                            75 MW
                                                                                                      72




                                                            Fincastle
                                                     Chin Chute                         Taber Wind                                                  128 MW
  N. Lethbridge    734L                                                                   Farm
                                                                      172AL
                                                                      (607L)




                      241S           Wind 30MW                                                                                   Seven Persons Peace Butte                     Wild Rose
      370S 207L
                       813L     Chin Chute IPP
                                                                                          80MW              Westfield              Wind Farm      404S                         Wind Farm
                111S    146S                                                                                 107S
     725L              823L         11MW                                               Wind Farm                                    120 MW                                      200 MW
                      L




                       Lakeview
                  725A




   Lethbridge                                                                          Project 514
                         593S                                           Conrad                                           Note: Line numbers in barckets denote new line numbers
                                            66L




      674S                                                                              102 MW
                      824L                                               135S
       Riverbend
        618S          Lethbridge                                                                                   138 kV                               Thermal Plant
               863L




                                         To                                                                        240 kV
                                       Stirling                                                                                                         Wind Farm
                                        67S                                                                        Planned
            To                                                                                                                                          Proposed Wind Farm
          Magrath
           225S

                                                                                                              Transmission facilities in Part A
                   To
           Great Falls, Montana
             (merchant line)                                                                                  Transmission facilities in Part B




                                                                  Alberta Electric System Operator
Draft for Discussion                                                                                  H-5-3                                                                        June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



  Table H5–1: Summary of Alt-B-4 Contingency Analysis Results – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                            Saskatchewan, Maximum Area Generation)

                                   Outage                                  Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
H5-2           All Elements in Service                                              --                            --             none
                                                                                                     (1)
H5-3           923L/927L West Brooks 28S to Langdon 102S       853L West Brooks 28S to Bassano Tap              107%             none
               to North Lethbridge 370S
H5-4           9L59 Anderson 801S to Cordel 755S               853L West Brooks 28S to Bassano Tap(1)           103%             none
H5-5           172L Taber 83S to Fincastle 336S                                    none                           --             none
H5-6           172L Bullshead 523S to Burdett 368S                                 none                           --             none
H5-7           172L Medicine Hat 41S to Bullshead 523S                             none                           --             none
H5-8           100L Medicine Hat 41S to Suffield 895S                              none                           --             none
H5-9           760L Medicine Hat 41S to Chappice Lake 649S                         none                           --             none
H5-10          New Hays 401S to Burdett 368S                                       none                           --             none
H5-11          New West Brooks 28S to Vauxhall 240 kV line                         none                           --             none
H5-12          New Vauxhall to Fincastle 240 kV line                               none                           --             none
H5-13          New Vauxhall to Bullshead 240 kV line                               none                           --             none
H5-14          New Vauxhall 240/138 kV transformer                                 none                           --             none

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-5-4                                                     June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H5–2: Summary of Alt-B-4 Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import from
           Saskatchewan, Maximum Area Generation)

                                   Outage                                        Overloaded Element                   Percent        Other
                                                                                                                      Overload      System
                                                                                                                                  Performance
                                                                                                                                   Concerns




  Figure No.
H5-15          All Elements in Service                         853L West Brooks 28S to Bassano Tap(1)(2)                109%         none
                                                                                                       (1)(2)
                                                               853L Bassano Tap to Queenstown 504S                      101%
                                                                                                      (1)(2)
H5-16          923L/927L West Brooks 28S to Langdon 102S       853L West Brooks 28S to Bassano Tap                      133%         none
               to North Lethbridge 370S
                                                               853L Bassano Tap to Queenstown 504S(1)(2)                125%
                                                                                                                (3)
H5-17          9L59 Anderson 801S to Cordel 755S               760L Amoco Empress 163S to Empress Liquids Tap           109%         none
                                                                                                      (1)(2)
                                                               853L West Brooks 28S to Bassano Tap                      125%
                                                                                                       (1)(2)
                                                               853L Bassano Tap to Queenstown 504S                      117%
H5-18          172L Taber 83S to Fincastle 336S                                        none                                  --      none
H5-19          172L Bullshead 523S to Burdett 368S                                     none                                  --      none
H5-20          172L Medicine Hat 41S to Bullshead 523S                                 none                                  --      none
H5-21          100L Medicine Hat 41S to Suffield 895S                                  none                                  --      none
H5-22          760L Medicine Hat 41S to Chappice Lake 649S                             none                                  --      none
H5-23          New Hays 401S to Burdett 368S                                           none                                  --      none
H5-24          New West Brooks 28S to Vauxhall 240 kV line                             none                                  --      none
H5-25          New Vauxhall to Fincastle 240 kV line                                   none                                  --      none
H5-26          New Vauxhall to Bullshead 523S 240 kV line                              none                                  --      none
H5-27 New Vauxhall 240/138 kV transformer                                              none                               --           none
   (1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
       and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.
   (2) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
       repetitiveness, only worst cases are reported
   (3) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
       Tap and Oyen 767S and reinforcing the Oyen area.


                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-5-5                                                      June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-5-6                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-6: Alternative B-5




                             Alberta Electric System Operator
Draft for Discussion                           H-6-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-6-2                                    June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure H6-1 Alternative B-5

                                                    To Anderson 801S &                                                                                                  To Oyen
                                                Sheerness Generating Station                                                                                             767S
                                                                    9L934/
                                                         933L       9L950
                           N          Brooks                       Ware Junction
                                                                                                                     Wardlow
                                                                                                                                                             Empress Liquids
                                                                                                                                                                   164S
                                                                      132S                                                                                             760AL
     To Langdon                                                                                                       230S                                                              Amoco
        102S                                  Bassano                                                                                                      Sandy Point   869           Empress
                                               435S              931L                                                                                                        L
                                                                                                                                                              204S                       163S
                                                                        Duchess                                          Jenner                                           760L
                                                                                                                                                               Empress
                                                                                                    951L                  275S
                                                                         339S                                                                                    394S     871L
                                                                                                    944L                                     945L         Wind Farm
                               To Queenstown                               Cutting Lake                                                                                    Sand Hills 830L
                    927L                              853L                                                                                                Project 590
                                   504S                                       227S                                                                          99 MW            341S
                                        935L                     814L
                    924L                                                                                                                                                                        9LS1M
                                                                   827L Brooks            Tilley                                                    Wind Farm                    McNeill
                                        923L
                                     Bow City
                                  Generating Plant
                                                               W. Brooks
                                                                  28S
                                                                         121S             498S                  Empress                             Project 617
                                                                                                                                                     100 MW
                                                                                                                                                                               Convertor
                                                                                                                                                                                               Sask Power
                                                                                                                                                                                             Interconnection
                                                                                                                                                                              Station 840S
                                    2x525 MW                                                 100L
                                    (proposed)
                                               763AL                                                         Suffield
                                         Enchant                                                              895S                      Chappice Lake               760L
                                          447S                                                                                              649S
                                                                                                                            100L
                                                                                                                           (892L)
                                                                                   Hays
                                                    Vauxhall
                                                                    821L           421S                                             Redcliff
                                                     158S


                                                                                                                                               Medicine Hat
                                                                                                                                                  41S
                                                                           Vauxhall                                                     172L (880L)
                                                                                                                                      Bullshead                   Medicine
                                     Coaldale                                                                172L                     N.O.
                                                                                                                                        523S
        To Peigan
           59S
                     Monarch
                      492S
                                      254S
                                                172L
                                                                   172L
                                                                  (610L)
                                                                                172L
                                                                               (612L)
                                                                                          Burdett
                                                                                           368S             (879L)           New
                                                                                                                           Bullshead
                                                                                                                                     600L                           Hat
                                                    Taber                   Fincastle                      Wind Farm                       Wind Farm
                                                     83S               336S
                                                                                                           Project 534                     Project 513
                 172L                   820L               New                                               75 MW                          128 MW
 To Ft. Macleod                                    Chin Chute            Taber Wind
                                                         Fincastle
       15S N. Lethbridge      734L
                                 241S             Wind 30MW                 Farm
                370S 207L                                                                                                Seven Persons Peace Butte                         Wild Rose
                                  8 13L      Chin Chute IPP
                                                                           80MW                     Westfield              Wind Farm      404S                             Wind Farm
   To Peigan               111S    146S                                                              107S
      59S       725L              823L           11MW                    Wind Farm                                          120 MW                                          200 MW
              Lethbridge          Lakeview                              Project 514
                                     593S                       Conrad                                 Note: Line numbers in barckets denote new line numbers
                 674S                                                    102 MW
                                                                 135S
                                 824L
                  Riverbend
                    618S       Lethbridge                                                                  138 kV                                   Thermal Plant
                                           To                                                              240 kV
                                                                                                                                                    Wind Farm
                                         Stirling
                                          67S                                                              Planned
                                                                                                                                                    Proposed Wind Farm
                       To
                     Magrath
                      225S

                                                                                                      Transmission facilities in Part A
                               To
                       Great Falls, Montana                                                           Transmission facilities in Part B
                         (merchant line)




                                                         Alberta Electric System Operator
Draft for Discussion                                                                               H-6-3                                                                                 June 6, 2007
                               Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



               Table H6–1: Summary of Alt-B-5 Contingency Analysis – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                                     Saskatchewan, Maximum Area Generation)

                                    Outage                                   Overloaded Element                    Percent     Other System
                                                                                                                   Overload    Performance
                                                                                                                                Concerns




  Figure No.
H6-2             All Elements in Service                        760L Redcliff(new) to Empress 394S(1)               110%          none
                                                                                                             (2)
H6-3             923L/927L West Brooks 28S to Langdon 102S      853L West Brooks 28S to Bassano Tap                 105%          none
                 to North Lethbridge 370S
H6-4             9L59 Anderson 801S to Cordel 755S              853L West Brooks 28S to Bassano Tap(2)              103%          none
                                                                                                       (1)
H6-5            172L Taber 83S to Fincastle 336S                760L Redcliff(new) to Empress 394S                  110%          none
                                                                                                       (1)
H6-6            172L Fincastle 336S to Burdett 368S             760L Redcliff(new) to Empress 394S                  112%          none
                                                                                                       (1)
H6-7            172L Bullshead 523S to Burdett 368S             760L Redcliff(new) to Empress 394S                  117%          none
                                                                                                       (1)
H6-8            172L Medicine Hat 41S to Bullshead 523S         760L Redcliff(new) to Empress 394S                  119%          none
                                                                                                       (1)
H6-9            100L Redcliff (new) to Suffield 895S            760L Redcliff(new) to Empress 394S                  132%          none
                                                                RP 534 tap to Burdett 368S                          114%
                                                                                                       (1)
H6-10           100L Redcliff (new) to Medicine Hat 41S         760L Redcliff(new) to Empress 394S                  110%          none
H6-11           760L Redcliff(new) to Chappice Lake 649S        100L Redcliff (new) to Suffield 895S                 99%          none
                                                                RP 534 tap to Burdett 368S                          111%
                                                                                                       (1)
H6-12           New Hays 401S to Burdett 368S                   760L Redcliff(new) to Empress 394S                  113%          none
                                                                                                       (1)
H6-13           New West Brooks 28S to Fincastle 240 kV line    760L Redcliff(new) to Empress 394S                  115%          none
                                                                                                       (1)
H6-14           New Fincastle 240/138 kV transformer            760L Redcliff(new) to Empress 394S                  115%          none
H6-15           New West Brooks 28S to Redcliff (new) 240 kV    100L Redcliff (new) to Suffield 895S                145%          none
                line                                            100L Suffield 895S to Tilley 498S                   136%
                                                                100L Tilley 498S to West Brooks 28S                 117%
                                                                760L Redcliff(new) to Amoco Empress 163S            183%
                                                                172L Medicine Hat 41S to Bullshead 523S             107%
                                                                172L Bullshead 523S to Burdett 368S                 156%




                                                          Alberta Electric System Operator
Draft for Discussion                                                       H-6-4                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                   Outage                                      Overloaded Element                     Percent          Other System
                                                                                                                      Overload         Performance
                                                                                                                                        Concerns




  Figure No.
H6-16          New Redcliff 240/138 kV transformer               760L Redcliff(new) to Chappice Lake 649S(1)            122%                   none

          (1) These line is overloaded with all elements in service as a result it will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (2) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.




                                                          Alberta Electric System Operator
Draft for Discussion                                                         H-6-5                                                              June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H6–2: Summary of Alt-B-5 Contingency Analysis – Scenario 4b (2012 Summer Minimum, 150 MW Import from
           Saskatchewan, Maximum Area Generation)

                                  Outage                                   Overloaded Element                  Percent       Other System
                                                                                                               Overload      Performance
                                                                                                                              Concerns




  Figure No.
H6-17          All Elements in Service                        853L West Brooks 28S to Bassano Tap(1)(2)         109%            none
                                                                                                      (1)(2)
                                                              853L Bassano Tap to Queenstown 504S               101%
                                                                                          (2)
                                                              RP 534 tap to Burdett 368S                        104%
                                                                                                     (1)(2)
H6-18          923L/927L West Brooks 28S to Langdon 102S      853L West Brooks 28S to Bassano Tap               132%            none
               to North Lethbridge 370S
                                                              853L Bassano Tap to Queenstown 504S(1)(2)         124%
H6-19          9L59 Anderson 801S to Cordel 755S              760L Amoco Empress 163S to Empress Liquids        112%            none
                                                              Tap(3)
                                                              853L West Brooks 28S to Bassano Tap(1)(2)         124%
                                                                                                      (1)(2)
                                                              853L Bassano Tap to Queenstown 504S               116%
H6-20          172L Taber 83S to Fincastle 336S                                    none                           --            none
H6-21          172L Fincastle 336S to Burdett 368S                                 none                           --            none
H6-22          172L Bullshead 523S to Burdett 368S            100L Redcliff (new) to Suffield 895S              100%            none
H6-23          172L Medicine Hat 41S to Bullshead 523S        100L Redcliff (new) to Suffield 895S              101%            none
                                                                                           (2)
H6-24          100L Redcliff (new) to Suffield 895S           RP 534 tap to Burdett 368S                        125%            none
H6-25          100L Redcliff (new) to Medicine Hat 41S                             none                           --            none
                                                                                           (2)
H6-26          760L Redcliff(new) to Chappice Lake 649S       RP 534 tap to Burdett 368S                        113%            none
H6-27          New Hays 401S to Burdett 368S                                       none                           --            none
H6-28          New West Brooks 28S to Fincastle 240 kV line                        none                           --            none
H6-29          New Fincastle 240/138 kV transformer                                none                           --            none
H6-30          New West Brooks 28S to Redcliff (new) 240 kV   100L Redcliff (new) to Suffield 895S              159%            none
               line
                                                              100L Suffield 895S to Tilley 498S                 149%



                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-6-6                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                   Outage                                     Overloaded Element                     Percent          Other System
                                                                                                                     Overload         Performance
                                                                                                                                       Concerns




  Figure No.
                                                                 100L Tilley 498S to West Brooks 28S                   130%
                                                                 760L Redcliff(new) to Amoco Empress 163S              142%
                                                                 172L Medicine Hat 41S to Bullshead 523S               126%
                                                                                            (2)
                                                                 RP 534 tap to Burdett 368S                            171%
                                                                 172L Bullshead 523S to Burdett 368S                   121%
H6-31          New Redcliff 240/138 kV transformer               100L Redcliff (new) to Suffield 895S                  106%               none
                                                                                            (2)
                                                                 RP 534 tap to Burdett 368S                           120 %

          (1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.

          (2) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (3) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.




                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-6-7                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-6-8                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix H-7: Alternative B-6




                             Alberta Electric System Operator
Draft for Discussion                           H-7-1                                    June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                           H-7-2                                    June 6, 2007
    Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Figure H7-1 Alternative B-6

                                                    To Anderson 801S &                                                                                                   To Oyen
                                                Sheerness Generating Station                                                                                              767S
                                                                    9L934/
                                                         933L       9L950
                           N          Brooks                       Ware Junction                                     Wardlow
                                                                                                                                                              Empress Liquids
                                                                                                                                                                    164S
                                                                      132S                                            230S                                              760AL
     To Langdon                                                                                                                                                                          Amoco
        102S                                  Bassano                                                                                                       Sandy Point   869           Empress
                                               435S              931L                                                                                                         L
                                                                                                                                                               204S                       163S
                                                                        Duchess                                           Jenner                                           760L
                                                                                                                                                                Empress
                                                                                                     951L                  275S
                                                                         339S                                                                                     394S     871L
                                                                                                    944L                                      945L         Wind Farm
                               To Queenstown                               Cutting Lake                                                                                     Sand Hills 830L
                    927L                              853L                                                                                                 Project 590
                                   504S                                       227S                                                                           99 MW            341S
                                        935L                     814L
                    924L                                                                                                                                                                         9LS1M
                                                                   827L Brooks            Tilley                                                     Wind Farm                    McNeill
                                        923L
                                     Bow City
                                  Generating Plant
                                                               W. Brooks
                                                                  28S
                                                                         121S             498S                   Empress                             Project 617
                                                                                                                                                      100 MW
                                                                                                                                                                                Convertor
                                                                                                                                                                                                Sask Power
                                                                                                                                                                                              Interconnection
                                                                                                                                                                               Station 840S
                                    2x525 MW                                                 100L
                                    (proposed)
                                               763AL                                                          Suffield
                                         Enchant                                                               895S                      Chappice Lake               760L
                                          447S                                                                                               649S
                                                                                                                             100L
                                                                                                                            (892L)
                                                                                   Hays
                                                    Vauxhall
                                                                    821L           421S                                              Redcliff
                                                     158S


                                                                                                                                                Medicine Hat
                                                                                                                                                   41S
                                                                           Vauxhall                                                      172L (880L)
                                                                                                                                       Bullshead                   Medicine
                                     Coaldale                                                                 172L                     N.O.
                                                                                                                                         523S
        To Peigan
           59S
                     Monarch
                      492S
                                      254S
                                                172L
                                                                   172L
                                                                  (610L)
                                                                                172L
                                                                               (612L)
                                                                                          Burdett
                                                                                           368S              (879L)           New
                                                                                                                            Bullshead
                                                                                                                                      600L                           Hat
                                                    Taber            Fincastle                              Wind Farm                       Wind Farm
                                                     83S   New         336S
                                                                                                            Project 534                     Project 513
                 172L                   820L             Fincastle                                            75 MW                          128 MW
 To Ft. Macleod                                    Chin Chute            Taber Wind
       15S N. Lethbridge      734L
                                 241S             Wind 30MW                  Farm
                370S 207L                                                                                                 Seven Persons Peace Butte                         Wild Rose
                                  8 13L      Chin Chute IPP
                                                                            80MW                     Westfield              Wind Farm      404S                             Wind Farm
   To Peigan               111S    146S                                                               107S
      59S       725L              823L           11MW                    Wind Farm                                           120 MW                                          200 MW
              Lethbridge          Lakeview                              Project 514
                 674S                593S                       Conrad    102 MW                    Note: Line numbers in barckets denote new line numbers
                                 824L                            135S
                  Riverbend
                    618S       Lethbridge                                                                   138 kV                                   Thermal Plant
                                           To                                                               240 kV
                                         Stirling                                                                                                    Wind Farm
                                          67S                                                               Planned
                       To                                                                                                                            Proposed Wind Farm
                     Magrath
                      225S

                                                                                                        Transmission facilities in Part A
                               To
                       Great Falls, Montana
                         (merchant line)                                                                Transmission facilities in Part B




                                                         Alberta Electric System Operator
Draft for Discussion                                                                               H-7-3                                                                                  June 6, 2007
                               Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



               Table H7–1: Summary of Alt-B-6 Contingency Analysis – Scenario 3b (2012 Summer Minimum, 150 MW Export to
                                                     Saskatchewan, Maximum Area Generation)

                                    Outage                                  Overloaded Element                   Percent       Other System
                                                                                                                 Overload      Performance
                                                                                                                                Concerns




  Figure No.
H7-2             All Elements in Service                                            none                            --            none
                                                                                                      (1)
H7-3             923L/927L West Brooks 28S to Langdon 102S      853L West Brooks 28S to Bassano Tap               104%            none
                 to North Lethbridge 370S
H7-4             9L59 Anderson 801S to Cordel 755S              853L West Brooks 28S to Bassano Tap(1)            102%            none
H7-5            172L Taber 83S to Fincastle 336S                                    none                            --            none
H7-6            172L Fincastle 336S to Burdett 368S                                 none                            --            none
H7-7            172L Bullshead 523S to Burdett 368S                                 none                            --            none
H7-8            172L Medicine Hat 41S to Bullshead 523S                             none                            --            none
H7-9            100L Redcliff (new) to Suffield 895S                                none                            --            none
H7-10           100L Redcliff (new) to Medicine Hat 41S                             none                            --            none
H7-11           760L Redcliff(new) to Chappice Lake 649S                            none                            --            none
H7-12           New Hays 401S to Burdett 368S                                       none                            --            none
H7-13           New West Brooks 28S to Fincastle 240 kV line                        none                            --            none
H7-14           New Fincastle 240/138 kV transformer                                none                            --            none
H7-15           New West Brooks 28S to Redcliff (new) 240 kV    RP 534 tap to Burdett 368S                         98%            none
                line
H7-16           New Redcliff 240/138 kV transformer             760L Redcliff(new) to Chappice Lake 649S          107%            none
                                                                760L Chappice Lake 649S to Empress 394S           105%
                                                                RP 534 tap to Burdett 368S                        109%
H7-17           New Redcliff to Empress 240 kV line             760L Redcliff(new) to Chappice Lake 649S          110%            none
                                                                760L Chappice Lake 649S to Empress 394S           107%

(1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown and
Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.


                                                          Alberta Electric System Operator
Draft for Discussion                                                       H-7-4                                                    June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



Table H7–2: Summary of Alt-B-6 Contingency Analysis Results – Scenario 4b (2012 Summer Minimum, 150 MW Import from
           Saskatchewan, Maximum Area Generation)

                                  Outage                                      Overloaded Element                         Percent    Other System
                                                                                                                         Overload   Performance
                                                                                                                                     Concerns




  Figure No.
H7-18          All Elements in Service                        853L West Brooks 28S to Bassano Tap(1)(2)                   108%         none
                                                                                                       (1)(2)
                                                              853L Bassano Tap to Queenstown 504S                         100%
                                                                                                      (1)(2)
H7-19          923L/927L West Brooks 28S to Langdon 102S      853L West Brooks 28S to Bassano Tap                         131%         none
               to North Lethbridge 370S                                                                (1)(2)
                                                              853L Bassano Tap to Queenstown 504S                         123%
                                                                                                                   (3)
H7-20          9L59 Anderson 801S to Cordel 755S              760L Amoco Empress 163S to Empress Liquids Tap              118%         none
                                                                                        (3)                  (3)
                                                              760L Empress Liquids Tap        to Oyen 767S                105%
                                                                                                      (1)(2)
                                                              853L West Brooks 28S to Bassano Tap                         123%
                                                                                                       (1)(2)
                                                              853L Bassano Tap to Queenstown 504S                         115%
H7-21          172L Taber 83S to Fincastle 336S                                       none                                  --         none
H7-22          172L Fincastle 336S to Burdett 368S                                    none                                  --         none
H7-23          172L Bullshead 523S to Burdett 368S                                    none                                  --         none
H7-24          172L Medicine Hat 41S to Bullshead 523S                                none                                  --         none
H7-25          100L Redcliff (new) to Suffield 895S           RP 534 tap to Burdett 368S                                  108%         none
H7-26          100L Redcliff (new) to Medicine Hat 41S                                none                                  --         none
H7-27          760L Redcliff (new) to Chappice Lake 649S                              none                                  --         none
H7-28          New Hays 401S to Burdett 368S                                          none                                  --         none
H7-29          New West Brooks 28S to Fincastle 240 kV line                           none                                  --         none
H7-30          New Fincastle 240/138 kV transformer                                   none                                  --         none
H7-31          New West Brooks 28S to Redcliff 240 kV line    100L Redcliff (new) to Suffield 895S                        107%         none
                                                              RP 534 tap to Burdett 368S                                  122%
H7-32          New Redcliff 240/138 kV transformer            100L Redcliff (new) to Suffield 895S                        107%         none
                                                              RP 534 tap to Burdett 368S                                  122%



                                                         Alberta Electric System Operator
Draft for Discussion                                                     H-7-5                                                         June 6, 2007
                             Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation



                                   Outage                                        Overloaded Element                       Percent       Other System
                                                                                                                          Overload      Performance
                                                                                                                                         Concerns




  Figure No.
H7-33          New Redcliff to Empress 240 kV line               RP 534 tap to Burdett 368S                                 103%             none

          (1) This constraint will be addressed through a South System planning study. A possible solution is opening the line between Queenstown
              and Bassano Tap and reinforcing the Queenstown area possibly by building a new 240 kV source for the area.

          (2) These lines are overloaded with all elements in service as a result they will be overloaded under most outage conditions. To avoid
              repetitiveness, only worst cases are reported

          (3) This constraint will be addressed through a Hanna area planning study. A possible solution is opening the line between Empress Liquids
              Tap and Oyen 767S and reinforcing the Oyen area.




                                                          Alberta Electric System Operator
Draft for Discussion                                                        H-7-6                                                           June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




Appendix I:            Part B – Cost Estimates




                             Alberta Electric System Operator
Draft for Discussion                            I-1                                     June 6, 2007
   Southeast Alberta Transmission Development–Detailed Alternative Assessment and Recommendation




                               {Page intentionally left blank}




                             Alberta Electric System Operator
Draft for Discussion                            I-2                                     June 6, 2007

				
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