Draft SATS Meeting Notes
Trico Electric Cooperative, Inc. Offices
April 24, 2008
Bruce Evans, SWTC
Jim Rein, SWTC
Leonard York, Western
Jim Tang, CAP
Reuben Ruiz, CAP
EvaMarie King, SWTC
Don Byron, Western
Gary Bates, Western
Karen Cathers, Trico
Ron Brown, Trico
Bobby Chavez, TEP
Vicki Sandler, AzISA
Ron Belval, TEP
Milt Percival, WSES
Ray Som, SWTC
Gary Trent, TEP
Dennis Delaney, KRSA
Jaime Wood, EPG
Cindy Bailey, SunZia
Tom Wray, SunZia/SWPG
Lisa Szot, NM RETA
1) Welcome and Introductions
Ron welcomed everyone to Trico’s offices and asked the attendees to introduce
The agenda for the meeting was briefly reviewed with Ron noting that under Item #5
Status Reports of 2018, 2028 and Saturated Power Flow Analysis, he would provide
some information on a 2038 case that TEP has begun to develop.
2) Review/Approve 3/27/2008 Meeting Notes
The notes were approved without any comments. Bruce will send a final copy of the
Notes to the group next week.
3) Stakeholder Planning Meeting Status
Bruce presented a draft presentation to the group for the first Public Stakeholder
Transmission Planning Meeting that TEP and SWTC will sponsor. He suggested a date
of June 5th for the meeting. Comments to the presentation include:
Spell out all acronyms
Develop a graphic showing the Regional Planning Areas. One suggestion is to
use the one developed by SWAT
Add information of where the decision making authority lies
Discuss base case development and its importance to the process
Include all SWAT subgroups – list on slides and also on the graphic showing
the Regional Planning Areas
Add NM RETA
Change the bullet of the NERC TPL Draft Standards on the slide which
discusses the WECC PCC to NERC/WECC TPL Draft Standards. Discuss that
some WECC standards are more stringent than the NERC standards
The list of Stakeholders should include city/county jurisdictions and large
The notice of the meeting should be placed on the TEP and SWTC OASIS, the
WestConnect website and in other mediums. It was suggested that a check be
made with SRP and APS as to how they have announced their first Public
Transmission Planning Meeting, which is scheduled for May 21st, in Phoenix.
4) Integration of SPPR Three Terminal Plan
Dennis Delaney of K.R. Saline and Associates provided an update on the activities of the
SPPR Group. SPPR stands for Southwest Public Power Resources Group. SPPR was
developed by a group of small entities who were looking at various resource options,
such as purchased power, building a generating unit, and renewables. The effort has now
been narrowed down to a building a gas-fired power plant in Pinal County. The proposed
delivery points for the output of the power from this plant are:
An information sheet and a map were passed out to the group which discusses the
transmission upgrades that will be needed to accommodate a new gas-fired generator in
Circuit 1: The 230 kV circuit from Test Track/Santa Rosa 230 kV bus to the new
ED5 230 kV Switching Station would consist of two contiguous segments. From
Test Track/Santa Rosa to Thornton Road, SPPR would construct and own the 230
kV circuit on the SEV 500 kV line; and, from Thornton Road to the new ED5 230
kV Switching Station, SPPR would convert a portion of Western’s Casa Grande
to Empire to Saguaro 115 kV line to a double circuit 230 kV line.
Circuit 2: From the new ED5 230 kV Switching Station to Pinal Central, SPPR
would convert the Western 115 kV line from ED5 to ED4 to ED2 to a double
circuit 230 kV line.
Circuit 3: From the new ED5 230 kV Switching Station to SWTC’s Marana
Substation, SPPR would convert the remaining portion of the Western 115 kV
line from Empire to Saguaro and the Western 115 kV line from Saguaro to
Marana Tap to a double circuit 230 kV line.
Dennis explained to the group that a location for the power plant has not been formally
determined. The project is in the starting phase and preliminary discussions with
Western about the rebuild of their lines in the area, are on hold until a site is selected.
However, the Western ROW is key to the process. SPPR will rebuild the Western 115
kV lines to 230 kV, but they will still be operated at 115 kV. He noted that rebuilding the
Western 115 kV lines past Casa Grande to 230 kV is already in Western’s ten year plans.
Dennis briefly discussed that he is aware that the announcement of the SPPR plan is
causing a conflict with the SATS plan of 345 kV in the Marana Area. He asked if this
will be a double-circuit 345 kV line or a single-circuit 345 kV line. Ron explained that it
would be single-circuit 345 kV line. Dennis stated that this would cause a problem
because a single 345 kV line out of Saguaro to Marana would break up the Western 115
kV Parker-Davis system which needs to stay intact to serve the Parker-Davis customers.
The 345 kV line would need to have a transformation at Saguaro back to 115 kV. Dennis
also noted that the SPPR group was aware of the complexities at Saguaro and that is why
they decided not to go into Saguaro with their proposed 230 kV line.
The Saguaro Switching Station consists of a 500 kV buss with a 500 kV line to Cholla
and 2-500 kV lines to Tortolita. There are two 500/115 kV transformers. All four
generating units at Saguaro are connected to the 115 kV buss. There are 2-115/230 kV
transformers feeding some 230 kV circuits that cross the Freeway and head back to Casa
Grande. In addition, there are some 12 kV circuits coming out of Saguaro. Because of
the complexities involved at Saguaro, Dennis suggested that a sub-group be appointed to
study this area for SPPR and SATS and also involve the CATS-HV group.
There were some general questions regarding SPPR that were answered by Dennis:
i. The SPPR group began looking into approximately 20 sites for a power plant
within Arizona, Nevada and New Mexico.
ii. The planned in-service date for the plant is 2013.
iii. The transmission system as presented today (Three Terminal Plan) will work for
any site that is selected in Pinal County.
iv. All three lines as proposed in the Plan will be built in stages and need to be built
to support the plant when it comes on-line.
v. The Plan notes that SPPR will be using the 230 kV that is proposed to be built
along Thornton Road as part of the Santa Rosa to Pinal Central 500/230 kV
vi. The new 230 kV lines will be replacing the Western 115 kV lines, which are
currently H-frame structures, with new steel poles that will be double-circuit 230
kV with 1272 ACSS conductor.
vii. SPPR may contract with Western to build the transmission that is proposed for the
project. With regards to the existing ROW, Don Byron noted that the wording of
Section 14 of the draft SATS Report will also apply to the SPPR Project:
“There is no voltage or construction restrictions as long as the new construction
fits within the existing ROW width and the transmission poles are owned by the
“Any corridor width adjustments would require Western to go back to the land
owner and renegotiate a new ROW easement agreement. If renegotiations with
the perspective land owner are not successful, as a last resort, the Federal
Government can use its condemnation rights to obtain the necessary corridor.”
Tom Wray noted that the ACC may require an EIS on these new transmission
lines, prior to interconnection to the power plant.
viii. Additional transmission may need to be built to connect these proposed 230 kV
lines to the power plant.
ix. Is there a potential for the SPPR project to integrate with the proposed 500 kV
line from PV to Saguaro to Winchester? Possibly, but it may not help the SPPR
group get to the growing load centers.
x. Is the load to be served by SPPR new load or existing load? It is both. SPPR
looked at their needs going forward, which included both the forecasted loads of
the participants and the existing loads, many of which are currently served by
contracts with other entities. These existing contracts for service to existing loads
are expected to go away upon completion of this Project.
xi. Will Santa Rosa get built on the 500 kV line from Pinal West to Pinal Central?
There are desires by some to do this, but there are complications. It would be a
500/230 kV yard.
The group discussed the study group for Saguaro and surrounding areas and will need to
determine the next step. There are OATT charges at Saguaro, which is owned by APS.
However, some entities have rights at Saguaro. Tom suggested that the group avoid
Saguaro because of the contractual issues. Dennis stated that this was looked at by the
SPPR group. Consideration was given to building a 230 kV yard across I-10 from
Saguaro where the 230 lines head north to Casa Grande.
Ron briefly discussed the options that have been proposed at SATS. Two 345 kV lines
are planned to come out of Tortolita. One will go across I-10 to Marana and follow the
Western ROW towards North Loop. The other will go directly to North Loop. He
envisions the 345 kV going to Marana being owned by Western with entities having
rights on the line. However, Dennis replied that this doesn’t get you back to the Western
system that goes north. He suggested the possibility of a 345/230/115 kV station across
the freeway from Saguaro.
SPPR will connect to two entities that have OATT’s. When asked who would be the
control operator of the power plant, Dennis replied that it will likely be AEPCO. It could
also be Western, but this hasn’t been nailed down yet.
Tom suggested an interconnection with an entity that is a Control Area who would do the
System Impact Studies. This would minimize the effort of working with several OATT
entities. He also suggested that any study of the Saguaro area include the SEV
participants and not just SPPR and SATS. In other words, a wider area should be
studied; one that takes in Saguaro, Tortolita, Santa Rosa, Pinal West, Pinal Central, etc.
Another suggestion was made to have the CATS-EHV and CATS-HV groups work with
SATS to do the study.
Dennis informed the group that the SPPR project plan was filed with the ACC by the
Santa Cruz Water & Power District. Tom suggested getting started on the study now and
be prepared for questions as to why we haven’t heard about it until now.
Dennis took an action item to ask the SPPR Management Committee to take the lead on
the study work and set up an official technical study group. The Committee meets on
May 16th and he will provide an update at the next SATS Meeting.
5) Status Reports of 2018, 2028 and Saturated Power Flow Analysis
Ron presented a power-point presentation with Slide 1 being a discussion of the latest
Strategies A, B, and D morphed into Strategy C. Now, however, a new Strategy F is
being developed. Strategy C is still the highest priority as it minimizes the number of
EHV lines that would be constructed through Tucson. Strategy F is similar to Strategy C,
but replaces SS30 with a 345 kV injection into Irvington.
A Strategy E was also considered, but it has the lowest study priority. It contains no new
injection points and was therefore discarded.
Ron also mentioned that as a result of the studies that have been developed for Saturation,
TEP felt the need for a case that looks out 30 years and therefore work has been started
on the development of a 2038 case.
Slide 2 – Assumed EHV Project Schedule:
Project 2018 2028 2038 Saturation
Pinal Central to Tortolita X X X X
Willow 345 kV & Bowie @ 500 MW X X X
Winchester to Tortolita 500 kV X X X
Double-ckt Winchester to Vail 345 kV X X? X?
Double-ckt Winchester to Vail 500 kV X? X?
Vail to South to Pinal West 500 kV X?
Slide 3 - Generation Scenario Schedule (Amounts in MW):
Generation Project 2018 2028 2038 Saturation
Bowie 500 500 500 0
Winchester 400 1000 1500
Pinal West 150 425 300
Pinal Central 120 425 300
Total 500 1170 2350 3100
The question was asked if the SPPR generation would displace any of these amounts?
Dennis replied yes, but it would depend on where it is connected. Most likely, it would
displace the amounts for Pinal Central.
Ron reiterated that the study effort to date, has looked only at serving load in the SATS
Slide 4 – Saturation Strategy C:
345 kV lines into Marana and North Loop.
345 kV line from South to SS30 and Vail to SS30.
Potential for 500 kV.
Slide 5 – Strategy F (At Saturation):
345 kV lines into Marana and North Loop.
345 kV line from South to Irvington and Vail to Irvington
Slide 6 – Construction Options Applicable to Western ROW
Saguaro to Marana Tap
Marana Tap to North Loop
Saguaro to Oracle
North Loop to DMP
Bobby Chavez of TEP next discussed the 138 kV work in the 2028 Case. Strategy C has
sources at North Loop, Vail and South. Loss of the 138 kV results in load shed.
Strengthening North Loop pushes problems into the Metro Tucson area.
Source at South and Vail:
New 138 kV stations are needed to serve new load growth. The existing system was
loaded up to see if there is capacity to serve the load. There isn’t, but adding new lines
and substations helped to balance the loading of the 138 kV lines. There is a need for 4
138 kV circuits in the area.
SS30 is a load serving station, but it may be beneficial to tie all 3 lines going to Irvington
into it. However, this competes with Swan tying into all 3 circuits. The current
evaluation is looking at establishing a path from east to west.
Source at Vail:
Trying to serve all of the load with the existing capacity will be difficult, because the 138
kV system is a huge loop. Currently, there are no east to west ties. Tying SS20 to Los
Reales was tried. However, if you lose Vail, everything now flows out of East Loop.
Next a new switching station was put into the 3 lines out of Vail. This may allow for
additional load to be served out of other substations, such as the future SS27 and SS24
The benefit of the switching stations is that they balance the loads and increase reliability.
TEP also looked at tapping the SWTC Vail to Bicknell 345 kV line and putting in the
Hartt Substation. This is to be jointly studied with SWTC. The initial look by TEP was
to put a proxy 345/138 kV substation in the case to get it to solve. The result yielded a
lot of benefits to TEP; such as increased flows towards Bicknell and the masking of some
of the issues between Vail and South.
EvaMarie King reported that she is still evaluating the 2018 case and will be able to
provide an update at the next SATS meeting.
Ron mentioned that TEP and SWTC need to get together to discuss the changes in the
2018 and 2028 cases. The SPPR project needs to be added into these cases. However,
TEP is moving ahead with the 2018 study and will be setting up a schedule for projects
and developing the project costs. The 345 kV projects out of Tortolita to North Loop are
expected to be joint projects between SWTC and TEP.
Dennis said that he is working on some solutions to study for both SPPR and SATS in the
Saguaro area and feels that the 345 kV projects proposed by TEP can be done in tandem
with the SPPR Project.
6) South & Southwest Tucson Study Area
Ron pointed out that this has already been discussed and that there is a possibility that
West Tucson will be included as well. A notice about the joint meetings between SWTC
and TEP will be sent to the group.
7) SunZia Project Status
Tom Wray stated that the Memorandum of Agreement (MOA) between the participants
should be executed next week. He will provide a more detailed discussion of the Project
Description, Schedule and Work Plan at the next SATS Meeting. An EIS is being
worked on which could take 2-3 years to complete.
Phase I is the permitting phase. The MOA defines the participants. SunZia is using the
SEV Agreement as a model. The MOA will terminate when the permits are in hand and
the leases for the ROW’s have been signed. 80% of the land is Federal land managed by
Phase 2 is the construction phase. A 500 kV line is planned to be built from Pinal Central
to points in New Mexico. An in-service date of late 2013 is planned.
Bowie Project Update:
Land is being cleared for a grubbing site which is about 1 mile north of the town of
Bowie on I-10. Permits are being pulled now. The Engineer for the project is Kewick(?)
who bought out BIB(?). No Design Engineering firm has yet been selected. Upon
selection, this firm will work on the design for the interconnection with TEP at Willow.
The in-service date is January 2011. The first 500 MW block is expected to be on line in
Tom has been working with RETA and the NM utilities as to where the western terminus
of the renewables will be. A project rating for the ultimate facility will follow the WECC
Three-Phase rating process.
8) SATS Draft Report - Review
Draft 6 has been updated with the comments that Ron has received thus far. However, he
needs additional comments from the group for their respective areas in the Report.
9) WAPA ROW Report & Options Update
Don Byron stated that Western is still doing a review of the Oracle to Tucson ROW.
There are 2 projects going on right now, one on the Oracle to Tucson line where Pima
County is planning to widen a road in the area. The other project is on the Saguaro to
Tucson line where 7 new poles are being added to avoid washouts that have occurred
recently. These new poles are being constructed south of Marana, and according to
Western policy, they will be replaced with 230 kV insulated structures, but still operated
at 115 kV.
Don reminded the group that if any work is to be done in the Western ROW’s there are
environmental issues that will need to be dealt with.
The next JPA meeting is scheduled sometime in July. Don encouraged the group to
attend this meeting to learn more of Western’s joint planning efforts, especially the
discussion on wood pole line work. Dennis asked if he could make a presentation on
SPPR at this meeting. Ron stated that he may also want to do a presentation on SATS at
10) Cochise County Study Update
This agenda item was not covered today.
11) Executive Summary
This agenda item was not covered today.
12) Action Items:
a. Dennis to ask the SPPR Management Committee to take the lead on study work
for the Saguaro area and set up an official technical study group. The Committee
meets on May 16th and he will provide an update at the next SATS Meeting.
b. Tom to give an update on SunZia at the next SATS Meeting.
c. Tom suggested that the group have someone from ADOT come to the next SATS
Meeting and provide an update of the I-10 Bypass Study. Jaime has a contact
that she will provide to Ron.
d. A need to discuss corridor designations in the jurisdictional general plans will be
discussed at the next SATS Meeting.
e. A joint planning meeting between SWTC, Trico and TEP will be announced to
the group when the arrangements are made.
Lisa Szot provided a brief update of the efforts of the NM RETA. New committees were
set up at the Board meeting which was held yesterday. The committees are Finance,
Transmission Corridor and Projects Review. The next Board meeting will be held May
28th in Sante Fe.
13) Next Meeting Agenda
The meeting agenda for the next meeting will be similar to today’s meeting. However, it
will be sent out ahead of time for all to review.
14) Next Steps/Meeting(s)
A date of May 22nd was set for the next meeting at TEP’s offices. Ron will work on
getting a room scheduled. Subsequent to the meeting, however, several members of the
group received a notice of the 5th Biennial Transmission Assessment Workshop having
been set for May 22nd and 23rd. A poll of the next meeting date of June 2nd was accepted
by a majority of the group.