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Alternative Proposal - Executive Summary

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					Assessment of Alternatives: Woolooga –
     Eerwah Vale Transmission &
   Substation Project – 9 June 2010




          P.A.G.E.
                               Executive Summary
Powerlines Action Group Eumundi Inc (PAGE) are a community group representing the
people and landholders affected by the PL Woolooga to Cooroy 275kV transmission line and
Eerwah Vale substation project and are a key stakeholder in the EIS and community
infrastructure designation process. The objectives of the group are to ensure that the concerns
of the local community are effectively represented, their views communicated and the lowest
impact solution developed to meet the energy needs of the region.

This document will propose cheaper and lower impact solutions to the energy needs of the
region than adopted by Powerlink (PL). The proposals have not previously been properly
assessed by PL or Parsons Brinckerhoff (PL’s contracted EIS consultants). PAGE will put
forward three cheaper and significantly lower impact solutions:

    1. A single Bus Section Circuit breaker at Gympie (Cost estimated at $1.5M) deferring
       any augmentation requirement until at least 2027.
    2. A Staged augmentation north of Cooroy (NPV estimated at $96.2m – savings of
       $14.4m1)
    3. Network augmentation Woolooga to Palmwoods at 275kV using the existing PL
       easement (NPV estimated at less than $60.5m – a saving of over $50m)

Options 2 and 3 were put forward in submissions to the draft EIS in May 2009. The solutions
developed by PL from this information were incorrect and bore no relation to the actual
solution being proposed. PL did not attempt to clarify or validate their understanding of the
alternative solutions that they assessed and dismissed in the EIS. Options 1 and 3 have been
put forward by an independent electrical engineering consultant, who has also reviewed
option 2 and concluded that this is also a feasible alternative to the Powerlink proposal (The
full report is attached in Appendix A).


Conclusion
The Eerwah Vale 275kV tee off line and substation is not required for the Energex 132kV
Woolooga to Palmwoods system and the PL preferred solution is not the cheapest or lowest
impact solution. The lowest cost, lowest impact solution is a combination of Option 1, which
overcomes the short term network constraint in Gympie and Option 3 which provides the best
long-term solution for the Sunshine Coast.

Option 2 as proposed in May 2009 in the response to the draft EIS is designed to be a
comparable lower cost, lower impact alternative to that presented by PL on a like for like
basis. It also has the advantage of being a staged solution, deferring further augmentation
until an established need is demonstrated as confirmed in the independent electrical
                               2
engineering consultant’s report .




1
  Base Powerlink NPV of $110.6m, Final EIS Appendix G p26 consistent with the figures used
throughout the EIS
2
  Appendix A – Performance Electrics – Study Report p4


PAGE Alternative Proposal Final.doc                                                 Page 1 of 17
Recommendation
Based on the above options, the PL preferred option cannot be endorsed and Community
Infrastructure Designation (CID) should not be granted. The EIS has failed to address all of
the relevant and cheaper options. The PL preferred option is clearly not the cheapest option
and will not pass the regulatory test as required by the Australian Energy Regulator. The CID
should be refused and PAGE asks for an independent and transparent assessment be made of
the options proposed in this document and the lowest impact and cheapest option selected that
meets the network requirements.




Jack Connolly,
President,
Powerlines Action Group Eumundi Inc.

9 June 2010




PAGE Alternative Proposal Final.doc                                            Page 2 of 17
                                  Detailed Options
Option 1 / Option 3 – A single Bus Section Circuit breaker at Gympie / Network
augmentation Woolooga to Palmwoods at 275kV

The 132kV Energex system from Woolooga to Palmwoods could overload the Woolooga to
Gympie 132kV transmission lines continuous rating to 75 Degrees Celsius in the year 2017 if
it was left as a free flowing network with no further upgrades. This can be overcome by
opening the Gympie to Traveston 132kV transmission line and installing a 132kV bus section
circuit breaker at Gympie substation with a relatively modest cost estimated below $1.5M.
With the proposed bus section circuit breaker and the 132kV line opened at Traveston, then
the 132kV system would remain within its continuous 75 Degrees Celsius rating until the year
2038.

The Energex 132kV system could be made to (or has) a firm capacity at approximately
600MW based on 4 transmission line infeeds each rated at 200MW and one of them being out
of service. The Energex 132kV network demand is not projected to exceed 544MW even to
the year 2052 based on long range forecasts in EIS and repeated here in this report. Hence the
Energex system could be operated to maintain it’s 2HEC rating far into the future load
projections. The 132kV system continuous demand rating at 75Degrees Celsius is estimated
at 150MW per line and hence 450MW in an N-1 configuration with three lines in service.
This load is estimated around the year 2040.

Based on simple calculations and more detailed assessments made in this report, it is therefore
concluded that a modest investment below $1.5M could maintain the Energex system within
its continuous rating until at least 2038 and within its 2HEC ratings until at least 2047. The
need to urgently amplify the 132kV system to support the Energex 132kV Woolooga to
Palmwoods demand is not apparent.

The proposed project which installs a 275/132kV substation at Eerwah Vale proposes
transmission flows to Palmwoods beyond the 2HEC capacity of the 275kV and 132kV system
combined. To support the proposed project in an N-1 configuration of the 275kV and 132kV
networks, then 132kV transmission line upgrades would be required from the new substation
to Palmwoods. These upgrades have not been assessed in the project EIS.

With the required additional 132kV transmission line from Palmwoods to Cooroy in service,
then the Energex system could be made to operate within its continuous and N-1 ratings
beyond 2052 without the Eerwah Vale substation in service.

If the Eerwah Vale substation project is not progressed, then a 275kV line from Woolooga to
Palmwoods would be required by the year 2027 due to the N-1 operation of the Energex
132kV system along with the Palmwoods other loads combining to exceed the 275kV
800MW N-1 configuration demand rating. However it is noted that the 275kV line might be
deemed acceptable to operate to 90 Degrees Celsius in the N-1 emergency configuration and
hence delay the 275kV upgrade to the year 2037.




PAGE Alternative Proposal Final.doc                                              Page 3 of 17
Assumptions:
1. The above 132kV line amplifications which are required by the proposed project and not
   dealt with in the EIS but would ultimately be required in any case,
2. That the Eerwah Vale 275/132kV substation is not needed as noted in this report,
3. The need for load capacity into Palmwoods 275/132kV substation (ref EIS and Table 4.1
   of this report),
4. The available 275kV easement from Woolooga to Palmwoods (ref EIS proposed project),
5. The already proposed half initiated construction of the 275kV line from Woolooga to
   Eerwah Vale by the proposed project (ref EIS proposed project),
6. The strategic requirement to complete the Woolooga to Palmwoods 275kV transmission
   system in order to maximise generation flows to the greater Brisbane area (ref EIS page
   20),
7. The Energex 132kV system between Woolooga and Palmwoods has been shown to be
   operable in N-1 configuration of the 132kV system, N-1 configuration of the 275kV
   system and N-2 configuration when both systems are considered,
8. The N-1 assessments of the 275kV system in this report will become redundant, and
   hence the enormous possible phase shift in the Woolooga and Palmwoods supply will be
   relieved to a more tolerable level as considered in the Normal configuration load flows
   and in the 132kV N-1 configuration load flows (having 12 Electrical Degree maximum
   phase shift) and
9. It is further noted in reference [6] that capacitor banks in the Woolooga to Palmwoods
   underlying system have been considered and are planned for implementation already
   given an additional 20MVAr 33kV bank planned for Nambour 33kV system at a cost of
   $1.26M. It is therefore considered unlikely that the cost of capacitor banks to support the
   power factor correction of the Woolooga to Palmwoods 132kV system would need to be
   duplicated costed as part of this system assessment.

Based on the above it would appear prudent to complete the 275kV transmission system to
Palmwoods in order to secure Palmwoods with 1600MW capacity as compared to the present
800MW capacity and proposed project 1000MW capacity. The timing of this upgrade is
required by the year 2027 if the 275kV transmission line emergency rating is maintained at
800MW (75 Degrees Celsius operation) and this could be extended to the year 2037 if the
275kV transmission line rating is increased to allow 90 Degree Celsius operation in the 2
Hour Emergency Condition rating. Such an allowance to operate the 275kV line to 90
Degrees Celsius would not seem unreasonable with strategies that are presently being used by
Energex subsequently being adopted by Powerlink.

With completion of the 275kV line to Palmwoods then the capacity of Palmwoods substation
would extend well beyond 2052.


 It is incomprehensible from a system strategic assessment as to why the proposed
 275kV injection with 800MW capacity would be fed into a 132kV bottle neck which is
 the 132kV system between Woolooga to Palmwoods given that the 132kV system
 limits the flows out of the 132kV system to the wider Sunshine coast area to 200MW
 in its present and proposed configuration, while the wider sunshine coast area is seen
 to be the area which demands the new additional supply capacity.


In summary the Energex 132kV system between Woolooga to Palmwoods could be
augmented with a single Bus Section Circuit breaker at Gympie and the 132kV network could
provide N-1 contingency conditions of the 132kV transmission system, to at least the year
2038. The cost of a 132kV bus section circuit breaker is expected to be irrelevant in the
scheme of the Energex system (less than $1.5M).



PAGE Alternative Proposal Final.doc                                             Page 4 of 17
    The need for 275kV network augmentation is not required until 2027, when it is
    strategically better to augment between Woolooga and Palmwoods at an estimated
    cost of $185.6m (NPV of $60.5m). In total a saving of $48.6m over the PL proposal
    with longer term benefits, which meets Powerlink’s stated long term strategic aims.


A summary of the finances is shown below in Table 1:




Table 1

The cost/ km for the 275kV transmission line has been priced using PL’s figures for the new
proposed easement through the difficult terrain of Ridgewood and Eerwah Vale, including the
                              3
acquisition of new easements . The line to Palmwoods runs entirely on the existing 275kV
easement and it is expected will be significantly cheaper than the acquisition of new
easements with a lower environmental impact due to the existing 275kV line and meets the
long term strategic goals of continuing power supplies to Brisbane (if required). This makes
the potential savings noted above very conservative.

    Alternatively using a more reasonable costing of $1m/km as per the Northern section
    of PL’s proposal from Woolooga to Andrews Road. At a cost of $1m/km for
    transmission infrastructure on the already acquired easement between Woolooga to
    Palmwoods, the transmission line needed by 2027 has an NPV of $38.4m and the
    savings are dramatic - in excess of $72m NPV compared to PL’s project costs.
.




3
 100km at PL’s cost of line per km of $1.726m/km based on Southern Section costs of$32.1m for
18.5km


PAGE Alternative Proposal Final.doc                                                 Page 5 of 17
Option 2 – Staged augmentation north of Cooroy

The PAGE route solution focuses on the southern section of the proposed transmission line
from the intersection of Andrews Road and the Bruce Highway (nearest tower 125). To
provide a like with like comparison to the Powerlink proposal costs are shown for the entire
project. Costs for transmission line to Andrews Road and substation construction are PL’s
own figures of $65.5m ($97.6m less cost of southern section of $32.1m). The solution has
used the details relating to project need / justification within the EIS in terms of population,
and peak load projections.

Stage 1
From the existing 275kV easement adjacent to the Bruce Highway and Andrews Road,
continue along the existing road corridor to a new 275/132 kV Substation, sited near
Kennedys Road to link into the existing 132kV Energex lines that supply the Cooroy
Substation (See attached map). The length of the route for this first stage is 8km. The existing
132kV line to the Cooroy substation is 5.5kms and creates no additional adverse impacts.
This solves the initial network constraints at Gympie by utilising the existing 132kV
infrastructure much more successfully than the 18.6 km PL proposal.

This staged approach allows the deferment of expenditure of $51.8m on stage 2 until it is
clearly demonstrated that it is required for the North Sunshine Coast region (currently
projected to be beyond 2027) with an NPV of $16.9m.

Tee off from the existing 275kV easement adjacent the Bruce Highway and Andrews Road,
install along the planned service roads (the downgraded highway- as per Cooroy to Curra
Upgrade plans) to a new 275/132 kV Substation, sited to conveniently link near Kennedys
Road into the existing 132kV Energex lines that supply into the existing Cooroy Substation.

The length of the route for this first (new) stage is approximately 8km. The existing 132 kV
line to the Cooroy substation is approx. 5.5km and adds no further impacts. Note: this is the
same line that PL plan to inject into south of Cooroy.

Injecting to the north of Cooroy utilizes the existing 132 kV infrastructure much more
successfully, overcoming the immediate 132 kV network issues being addressed by the
18.6km PL proposal (from Andrews to Eerwah Vale), but at cheaper cost and lower impact.
Stage 1 is a lower cost solution which overcomes the forecast short term network problems
and allows time for Demand Management strategies, Smart Grid technology, and PV
installations and other developments to control peak power which is the priority for Energex
and the Government.




PAGE Alternative Proposal Final.doc                                               Page 6 of 17
Pictorial view of the option 2 solution vs. PL’s proposal
Figure 1




Figure 1 shows the significantly shorter option 2 first stage compared with PL’s proposal
from Andrews Road and shows three possible substation sites noted as items 1-3 at the top of
the map.




PAGE Alternative Proposal Final.doc                                           Page 7 of 17
Option 2 – Stage 1 – Substation Site Options and linkage to existing 132kV Energex
lines to Cooroy
Figure 2




Figure 2 shows the possible choice of substation sites depending upon Powerlink’s ultimate
choice of the preferred stage 2 option selected. In the map illustrated in Figure 2 use of the
rail corridor is shown with the linkage at 132kV into the existing Energex 132kV lines in the
proximity of Kennedy’s Road, shown as E Tower on the map.

The 275kV / 132kV substation site can be located at suggested sites 1 or 2, extending to the
Energex network at 132kV. Or alternatively, the 275kV / 132kV substation site can be located
at suggested sites 3 or 4, near Kennedy’s Road with a very short 132kV link to the existing
Energex lines.




PAGE Alternative Proposal Final.doc                                             Page 8 of 17
Option 2 – Stage 1 –Linkage to existing 132kV Energex lines to Cooroy Substation
Figure 3




The Figure 3 map shows the existing 132kV Energex lines from Kennedy’s Road to the
existing Energex Cooroy substation.

Stage 1 also recognises Energex planning and developments such as the SunCoast Power
Project (Palmwoods to Pacific Paradise substation) contribution to network support on the
North Sunshine Coast. This new 132kV Energex double circuit line is planned to be
established between Palmwoods 275/132 kV substation with a new 132kV substation at
Pacific Paradise,( just south of Coolum), to augment supply to the North Sunshine coast area.
This benefits and supports the Sunrise Hills substation load in 2 ways:

1. A portion of the existing Coolum substation load is to be shifted to the new substation at
   Pacific Paradise with a flow on of a partial reduction at the Coolum substation

2. The SEQIPP4 identifies the Pacific Paradise substation being linked to The Sunrise Hills
   substation at 132kV. (Note the SEQIPP is used as reference and support by PL in the
   EIS.) Energex commissioned PSA Consulting to identify potential corridors for this
   transmission line – several corridors were identified including a new substation site5. As
   noted in the Energex project update6 of 29 August 2008, “Known as the SunCoast Power
   Project, this new powerline will strengthen supply and improve reliability in the
   immediate area and benefit the rest of the North Coast region.” This network

4
    SE Queensland Infrastructure Plan And Program 2009-2026 , Part B – Energy Map 9
5
    http://psaconsult.com.au/our-projects/
6
    http://www.energex.com.au/pdf/network/suncoast/suncoast_newsletter_august_2008.pdf



PAGE Alternative Proposal Final.doc                                                   Page 9 of 17
    augmentation has not been considered by PL within the EIS and its impact on the power
    supply to the northern Sunshine Coast.

This proposal also maximises the potential for future “smart grids” technology to actually
feed power northwards to Gympie if required. This PAGE suggested site is 8.5kms closer to
the Gympie substation and avoids a similar limitation on the existing Cooroy to Eerwah Vale
lines with a substation site at Eerwah Vale as proposed.

Positioning the substation north of Cooroy allows 2 key network criteria to be maintained,
     1. “Power flow is southwards” and
     2. Maintains the “free flowing network” well.

Finances

The costings for option 2 and comparison to the PL proposal are shown in table 2 below:




Table 2

Costs for stage 1 are based on the higher 275kV costs for the Southern section of PL’s
proposal of $1.726m/km. The actual costs are expected to be significantly lower than this,
based upon the easier terrain, easier access for construction, lower easement acquisition costs
and lower construction costs.

It is noted that this option uses the service road adjacent to the Bruce Highway and as such
does not have the adverse access and visual impacts that Powerlink have noted in the EIS.
The total length for the 275kV section is suggested to be 6.3km, as such it does not pass the
housing developments adjacent to the Bruce Highway at Cooroy and does not impact the


PAGE Alternative Proposal Final.doc                                            Page 10 of 17
Cooroy Interchange (near Holts Rd) where Powerlink have claimed construction of an
overhead line here is not possible.


Stage 2
Develop a new double circuit 132 kV line for 8km from the new 275kV substation to the
existing Cooroy substation along the highway, including a 2.3km underground section past
Cooroy. These extra lines will provide the capacity required to meet the future demand based
upon PL’s own projections. Stage 2 is estimated to have an NPV of $16.1m. Stage 2 meets
the long-term needs of the N. Sunshine Coast as confirmed by the independent electrical
engineering consultant.

Option 2 – Stage 2 –From new substation sites to existing Energex 132kV Cooroy
Substation including overhead to Bagnalls Road and underground south of the Cooroy
interchange.
Figure 4




Figure 4 illustrates the 132kV second stage injection in 2027 from substation sites 1 or 2 to
Bagnalls Road, with a 2.3km underground section past Cooroy to south of the Cooroy
interchange, linking to the existing Energex 132kV substation at Nandroya Road, Cooroy.

The total NPV of PAGE’s proposal for stages 1 and 2 is $96.2m. This is $14.4m cheaper
than PL’s proposed NPV of $110.6m for the project. There are other options to implement
stage two of the PAGE solution.

Three other feasible options exist if consideration of alternatives at that time is required. The
options are:


PAGE Alternative Proposal Final.doc                                              Page 11 of 17
a) Upgrade the existing 132kV Energex lines from the injection point at N Cooroy (PAGE
   substation) to the Energex Cooroy substation as per the 914 / 915 Bankstown (Sydney)
   upgrade7 in 2002. It is estimated that the required 5.5km for the upgrade between North
   Cooroy to the Energex Cooroy substation would cost conservatively $16.5m. This would
   be required in 2027 and would reduce the NPV of Option 2 by a further $3m.
b) Install a double circuit 132kV underground lines along the existing 132kV Energex
   easement between the two substations,
c) Install a double circuit 132kV underground lines along the existing railway corridor to the
   Energex Cooroy substation as has previously been installed as per the Terranora line
   (Direct Link – Gold Coast).

The capacity of these extra lines can be in the order of 200 MVA x 2, which results in total
N-1 capacity available at the Cooroy substation of 600 MVA if this is still required at that
time. Present peak load of the North Sunshine Coast supplied through the Cooroy to Sunrise
Hills 132kv lines is 100MW8.

Option 2 - Benefits of the staged augmentation:

   This is a lower cost proposal and meets the requirements under the AER to deliver
    solutions at the lowest cost. This is $14.4m cheaper than the PL proposal;
   Makes more use of existing infrastructure corridors and existing infrastructure;
   strategically positions the network for future development;
   Avoids significant additional environmental impacts and has the lowest overall
    environmental impact;
   This proposal does not cause the fragmentation of more Koala habitat;
   There is a choice of discreet potential substation sites to enable efficient Stage 1 and
    Stage 2 connection as well as ensuring lesser impacts to the local area there.
   The number of houses / residents potentially affected as claimed by PL is dramatically
    reduced with this option.
   Using the highway service road, construction costs should be less, provides much better
    access to PL for construction / maintenance;
   The PL proposal impacts 18.6km from the Andrews Road tee off point, whereas the
    PAGE Stage 1 proposal only affects 8km. Stage 2, has various options and affects close
    to 7.7 km depending on the final substation site location. It also ensures that the majority
    of the project is on existing infrastructure corridors.
   The long term strategies as noted by PL, if proven necessary later, are not precluded by
    adopting just Stage 1 initially.

It should be noted that Stage 2 may not be necessary with the likely development of initiatives
for Demand Management strategies, Smart Grid technology, PV installations and other
developments to manage Peak Demand over the next 15 years. PAGE understands that
managing Peak Demand is a priority for Energex and the State Government. The Sunshine
Coast Regional Council has recently undertaken energy resources mapping, an EOI for
renewable energy solutions on the Sunshine Coast and energy demand management initiatives
with Energex, including the Sunshine Coast being announced as SEQ’s first energy
conservation community. Significant demand management and embedded energy generation
are high on the Council and Energex’s list of priorities at the present time. This further
strengthens the case for deferring large scale augmentation until absolutely necessary.


7

http://www.aer.gov.au/content/item.phtml?itemId=660383&nodeId=003e7093d8724ce7fdf4c10bb0a1a
053&fn=Attachments%206-9.pdf
8
  EIS - Woolooga-Cooroy Transmission Line Project Assessment of Need, p6


PAGE Alternative Proposal Final.doc                                             Page 12 of 17
Option 2 was submitted to PL / Parsons Brinckerhoff in response to the draft EIS in May
2009 (contrary to recent statements from PL’s Chief Operating Officer9) and is included in the
final EIS10, but seriously misinterpreted by PL in their EIS analysis of the option presented.
PL did not seek any additional information or confirmation of their interpretation of the
options that they presented.

Option 2 has been assessed by Performance Electrics and found to be a technically feasible
option.




9
    Noosa Journal 4 May 2010
10
    EIS - Attachment B, Copy of Submissions, PD_Submission number 51, p21


PAGE Alternative Proposal Final.doc                                           Page 13 of 17
The PL Proposal

PL propose a section of a 275 kV double-circuit transmission line running in an easterly
direction through Ridgewood and Eerwah Vale for 8.5km to the substation site 3km South of
the Energex substation. From Andrews Road to the tee off point for the PL proposal the
transmission line follows the existing 275kV transmission line for 10km. The NPV of the
southern section is quoted by PL as $32.1m11

An illustration of the PL proposal is shown in fig 1 below, showing the 18.5km of
transmission lines to the proposed substation site denoted by the red pylon markers.

The PL proposal directly impacts 28 properties and traverses good quality lifestyle, tourist
and agricultural land. The terrain is steep and difficult to access on the route selected,
resulting in a revising up by PL of the costs by $3m during the EIS.

Access through the last 8.5km of the southern section is required to be off access due to the
inaccessibility of the route selected, necessitating an extensive off easement development
through private land. The PL proposal is financially expensive, with significant environmental,
engineering        and       social      impacts        without       actually       delivering




                                                                                     Figure 1
the necessary power where the real energy and population increases are projected and planned
to be. The destruction and fragmentation of prime koala habitat and resultant impacts on a
healthy flourishing koala population can be avoided with a cheaper and lower impact solution
along a highway service road corridor to a suitable substation site. The key issues with the PL
proposal are:
 PL’s solution is not the least cost solution by at least $16m and will fail the AER
    regulatory test;
 PL’s solution will not meet the power supply needs of Gympie in the long-term and
    will require significant network augmentation (currently costed by PL at $68.8m);

11
     EIS Appendix U p24


PAGE Alternative Proposal Final.doc                                            Page 14 of 17
      The solution proposed by PL is not fit for purpose, is the highest cost, as well as having
       the highest environmental impact, most difficult access, and resulting adverse
       construction and maintenance impacts;
      The PL proposal threatens the existence of the koala and other significant fauna in this
       area; and
      The PL proposal positions the substation south of Cooroy which limits the ability to
       supply back to Gympie (if required under an N-1 condition). This is due to the fact
       that the solution is limited by the capacity of the lines between the Eerwah Vale and the
       Energex Cooroy substation to handle both the Sunrise Hills load and emergency N-1
       Gympie load.
      The Powerlink solution will need further augmentation to Palmwoods at either 132kV or
       275kV over and above this project to support the future needs of the Sunshine Coast. This
       has not been costed in the proposed PL Eerwah Vale project. This is validated in the
       independent review which states “Beyond 2035 a new 132kV transmission line from
       Cooroy (or Eerwah Vale) to Palmwoods will be required in either the proposed project or
       otherwise. This transmission line has not been addressed in the EIS for the proposed
       project and it seems a significant misgiving given that it is required to support the stated
                12
       project” .

      “It is incomprehensible from a system strategic assessment as to why the proposed
      275kV injection with 800MW capacity would be fed into a 132kV bottle neck which is
      the 132kV system between Woolooga to Palmwoods given that the 132kV system
      limits the flows out of the 132kV system to the wider Sunshine coast area to 200MW
      in its present and proposed configuration, while the wider sunshine coast area is seen
      to be the area which demands the new additional supply capacity.” Performance
      Electrics – Study Report on the Woolooga to Palmwoods 132kV Sunshine Coast Power
      System Capacity and Performance, June 2010




12
     Appendix A – Performance Electrics – Study Report p4


PAGE Alternative Proposal Final.doc                                                Page 15 of 17
Conclusion

This report concludes that:
    1. The Eerwah Vale 275kV tee off line and substation is not required for the Energex
       132kV system.

    2. The Energex 132kV system between Woolooga to Palmwoods could be augmented
       with a single Bus Section Circuit breaker at Gympie and the 132kV network could
       provide continuous plus N-1 contingency demand of the 132kV transmission system,
       to at least the year 2038. The cost of a 132kV bus section circuit breaker is expected
       to be irrelevant in the scheme of the Energex system (less than $1.5M) and the
       minimal investment now could provide significantly clearer knowledge and
       understanding of future load demand and possible demand management solutions
       which could be pursued for the next 28 years at least.

    3. The Palmwoods 275kV substation supply security is significantly compromised and
       is likely to require augmentation in any case based on the proposed project or
       otherwise. The proposed project will require additional 132kV transmission lines
       between the proposed Eerwah Vale Substation and Palmwoods in order to support the
       proposed 132kV transmission flows to Palmwoods in N-1 configurations.

    4. Beyond 2035 a new 132kV transmission line from Cooroy (or Eerwah Vale) to
       Palmwoods will be required in either the proposed project or otherwise. This
       transmission line has not been addressed in the EIS for the proposed project and it
       seems a significant misgiving given that it is required to support the stated project.

    5. The Cooroy to Sunrise Hills 132kV transmission system will need augmentation to
       maintain N-1 capacity around the year 2034. This aspect has not been addressed by
       the proposed project and it is required to support the transmission flows stated in the
       project. It appears a significant misgiving of the EIS to exclude this required system
       upgrade as part of the overall network augmentation assessment.

    6. The proposed Woolooga to Eerwah Vale 275kV transmission line and substation
       project should be cancelled.

    7. With the proposed Gympie Bus Section circuit breaker augmentation as noted above
       and with operation of the 132kV network as noted in this report, then the 275kV
       transmission line duplication between Woolooga and Palmwoods would be required
       by the year 2027 if the 275kV transmission line rating is maintained at 800MW
       however this could be extended to at least the year 2037 if Powerlink even partially
       adopt transmission line rating strategies as used by Energex. The future 275kV
       transmission line required between Woolooga and Palmwoods secures the system
       capacity for the whole of the Sunshine coast. This project could be completed on
       existing easements adjacent to an existing 275kV transmission line and with an
       outcome that secures Palmwoods to 1600MW capacity as compared to the 1000MW
       capacity in the proposed project. The reader is referred to Section 5 and particularly
       Section 5.6 of this report for a more thorough account of the numerous benefits and
       considerations to completing the 275kV Woolooga the Palmwoods transmission
       system.

    8. The PAGE option of a North Cooroy substation is technically feasible as noted in
       Appendix B of the Performance Electrics report. The only differences between the
       PAGE proposal with a northern substation and the proposed project in EIS with a
       Southern Cooroy substation is:


PAGE Alternative Proposal Final.doc                                           Page 16 of 17
          a. that the PAGE proposal would require an additional 200MW line to Cooroy
             by the year 2028 as compared to 2033 in the proposed project of EIS and
          b. the PAGE proposal would require completion of the single circuit line as a
             double circuit line (similar to existing towers) by the year 2033.




PAGE Alternative Proposal Final.doc                                       Page 17 of 17
                           Appendix A
 Performance Electrics Study Report


      Woolooga to Palmwoods 132kV
      Sunshine Coast Power System
       Capacity and Performance




PAGE Alternative Proposal Final.doc

				
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