Four Corners Queue Transmission Interconnection Study · System Impact Study Four Corners Queue...

Four Corners Queue Transmission Interconnection Study

System Impact Study Results

By

Arizona Public Service Company Transmission Planning &

Interconnection Development

March 21, 2016 Version 1

System Impact Study Four Corners Queue Transmission Study Contract No. 52807

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Table of Contents

1. INTRODUCTION ................................................................................................................................... 3

2. STUDY DESCRIPTION AND ASSUMPTIONS ..................................................................................... 3

3. STUDY RESULTS AND FINDINGS ...................................................................................................... 5

4. COST ESTIMATES AND RESPONSIBILITIES ..................................................................................... 6

APPENDIX A – Non-Simultaneous Study ..................................................................................................... 7


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List of Acronyms ACC Arizona Corporation Commission ACSS Aluminum Conductor Steel Supported ANPP Arizona Nuclear Power Project APS Arizona Public Service ATC Available Transfer Capability CAISO California Independent System Operator Corporation CAWCD Central Arizona Water Conservation District CCVT Coupling Capacitor Voltage Transformer COD Commercial Operation Date CSP Concentrated Solar Power CT Combustion Turbine or Current Transformer EPE El Paso Electric ER Energy Resource ERIS Energy Resource Interconnection Service FaS Facilities Study FERC Federal Energy Regulatory Commission FeS Feasibility Study GT Gas Turbine IID Imperial Irrigation District IR Interconnection Request LADWP Los Angeles Department of Water and Power LGIA Large Generator Interconnection Agreement NEC Navopache Electric Cooperative NERC North American Electric Reliability Corporation NR Network Resource NRIS Network Resource Interconnection Service NTUA Navajo Tribal Utility Authority OASIS Open Access Same Time Information System OATT Open Access Transmission Tariff PG&E Pacific Gas & Electric PNM Public Service Company of New Mexico POI Point Of Interconnection PPA Purchase Power Agreement PSLF/PSDS/SCSC Positive Sequence Load Flow/Positive Sequence Dynamic

Simulation/Short-Circuit Saturation Curve PST Phase-Shifting Transformer PV Photovoltaic RAS Remedial Action Scheme (also known as SPS) RFP Request for Proposal SCE Southern California Edison Company SDG&E San Diego Gas & Electric Company SIS System Impact Study SLG fault Single Line-to-Ground fault SPS Special Protection System (also known as RAS) SRP Salt River Project SSVEC Sulphur Springs Valley Electric Cooperative, Inc. SVC Static VAR Compensator SVD Static VAR Device SWTC Southwest Transmission Cooperative TC Transmission Customer TEP Tucson Electric Power TPIF Transmission Provider’s Interconnection Facilities TSR Transmission Service Request WAPA Western Area Power Administration WECC Western Electricity Coordinating Council


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1. INTRODUCTION Arizona Public Service Company (APS) performed this Transmission Service System Impact Study (SIS) in response to a 300MW Transmission Service Request (TSR) by the Transmission Customer (TC). The purpose of the study is to determine what facilities or system upgrades are needed to fulfil the TC’s proposed 300MW TSR for the transfer of enegy at the FOURCORN345 Point of Receipt and the NEWPOINT (AZ/NV border/El Dorado/CAISO Point of Delivery). The TC submitted a TSR for long-term point-to-point transmission service to APS and APS has determined that APS does not have sufficient capacity to grant the request without system upgrades. The TC’s requested service would commence January 1, 2018. This SIS identifies facilities that would increase APS’s transfer capability from FOURCORN345 to FOURCORN500; i.e. from the Four Corners 345 kV bus to the Four Corners 500 kV bus which is WECC Path 23. APS believes the facilities identified in this SIS will provide for an increased path rating of 420 MW. The study work performed for this SIS is equivalent to the non-simultaneous study portion of the WECC path rating process. The results of this SIS are contingent upon the approved rating that is achieved after the full WECC path rating process has been completed. With the facilities identified in this SIS, APS believes it can meet the TC’s requested commencement date assuming all necessary agreements, including but not limited to a Transmission Service Agreement (TSA), are executed and long-lead materials are ordered immediately following the execution of such agreements. All reasonable efforts will be used by APS to meet the Interconnection Customer’s proposed project dates. The Interconnection Customer will be responsible for procuring Transmission Service to and from the Point of Receipt and Point of Delivery beyond the APS service territory. APS will be responsible for constructing and placing into service the equipment and facilities required to fulfill the TCs TSR/TSA.

2. STUDY DESCRIPTION AND ASSUMPTIONS The objective of this report is to determine whether the new path rating that can be achieved with the addition of a second 500/345 kV transformer at Four Corners create enough additional scheduling capacity to satisfy the TCs Transmission Service Request (300 MW). Currently, the Four Corners 1AA 500/345 kV transformer solely comprises WECC Path 23 and has an existing bi-directional accepted rating of 1000 MW, which was determined in 2012. Following the addition of a second transformer, Path 23 will be redefined to include this new transformer. Figure 1 illustrates the transmission system in the vicinity of Path 23. In-order to achieve the objectives of this study, APS started the study process to determine a new path rating for Path 23 with the proposed project plan of service. The non-simultaneous study results are the assumptions APS is using in the analysis for this SIS. The final increase to Path 23 will be determined after the full WECC path rating process has concluded. If the path increase identified in the non-simultaneous study is not realized at the end of the path rating process then the results of this SIS analysis will need to be re-evaluated. All power flow and technical analysis is captured in the non-simultaneous study report, attached as Appendix A. Figure 2 illustrates the proposed interconnection of the transformer into the existing 500kV and 345kV switchyards. Another assumption of this SIS is that APS is going to recapture the scheduling rights on the Four Corners-Moenkopi-Willow Beach 500 kV line. APS has posted a notification on its OASIS page which states that Southern California Edison Company’s rights to 100% of APS’s transmission capacity between Four Corners 500 and Willow Beach, will expire on July 6, 2016. At that time the location of the CAISO interface will move from Four Corners 500 kV to Willow Beach 500 kV.


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Figure 1. Transmission System in the Four Corners vicinity


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Figure 2. Second Transformer Plan of Service

FOUR CORNERS 500/345 KV

Breaker int. ratings shown in Ka, either @ 550 kV or 362 kV base. Breaker continuous ratings for 500 kV and 345 kV buses are 3000 A and 2000 A, respectively.

Physical layout of 500 kV yard is still under review. Efforts will be made to avoid transformers sharing a common breaker.

MOENKOPI

63

63

63

5

4

5

6

112.2 MVAR@ 500 kV

SR162,3,&4

500KVWEST

EAST

63

220

19

50

50

PINTO

3

2

1

50

50

50

6

5

4

50

50

50

9

8

7

50

50

50

4

12

11

10

50

50

50

13.8KV

1025 MVA#1AA

T1716,T1710 & T1714

345KV

SANJUAN

WESTMESA

CHOLLA#2

230KV

#4700 MVA

T1598

CHOLLA#1

WEST

EAST

50

21

SHIPROCK

90.2 MVAR@ 345 kV

SR59,60,&61

65 MVARSR57

#8625 MVA

T542

M

50

50

14

15 13.8KV1025 MVANew Bank

63

13.8KV

3. STUDY RESULTS AND FINDINGS Appendix A of this SIS report is the study report demonstrating the non-simultaneous study results. The non-simultaneous study results show that with the addition of a second 500/345 kV transformer the rating of Path 23 can be increased by 420 MW. This would take the Path 23 rating from its current rating of 1000 MW to 1420 MW. With the path increase being attributable to the new transformer, APS as the project owner would gain 420 MW of scheduling capacity across Path 23. The additional capacity that would be achieved with the new transformer would allow APS to move the requested 300 MW from FOURCORN345 to FOURCORN500. At FOURCORN500 there is a single transmission line, Four Corners-Moenkopi 500kV line. APS has enough ATC to bring the 300 MW to Moenkopi. At Moenkopi the 500 kV line continues on to El Dorado and it is on this line that the requested POD lies. APS’s scheduling path on this line is from MOENKOPI500 TO WILLOWBEACH5001. On this line APS has 60 MW of long-term firm ATC that can be offered to the TC and 240 MW of conditional firm ATC. The 240 MW is conditional firm due to capacity rights that are currently contracted for as a back-up path to protect for the loss of the Navajo-Crystal 500 kV line. If the Navajo-Crystal 500 kV line is out of service, APS is obligated to supply transmission service up to Willow Beach. Per discussion with the TC, conditional firm scheduling rights are acceptable for this TSR.

1 Willow Beach is the point where the Moenkopi-El Dorado 500 kV line crosses the Arizona/Nevada border. This is the point at which APS’s ownership of the line ends and is the scheduling hand-off to CISO.


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4. COST ESTIMATES AND RESPONSIBILITIES In order to provide service for the TC, facilities will be required at the Four Corners transmission substation. There will be 345kV, 500kV, and 345/500 kV transformer work required. The facilities required include:

• New 500/345 kV Transformer – as identified in the System Impact Study, a second 500/345 kV transformer will be required. This includes three single phase transformers and a fourth single phase spare. Of which, APS is expecting to own, operate and maintain the new transformer.

• Existing 500/345 kV Transformer & Spare – the Four Corners Participants own the existing spare

and upgrades to the existing spare may take place. Costs associated with this upgrade, as agreed to between the Four Corners Participants, will be at the expense of APS and or the Participants.

• 345kV Switchyard – the substation bus will be extended to accommodate a new bay, breakers and line work will be required for service.

• 500kV Switchyard – the substation will be reconfigured to accommodate the new 500/345 kV

transformer. New breakers, line work, and bus work will be required.

• Control house upgrades will be required to accommodate new equipment for the new transformer and switchyard upgrades

The total estimated cost for the facilities required to provide transmission service is $23,206,000. The TC’s requested date to receive transmission service is January 1, 2018. APS estimates that it will take approximately 21 months in order to certificate, design, permit, procure, and construct the required facilities to provide the transmission service requested; putting the earliest possible date for the TC’s project to be energized at 21 months from the date all the appropriate agreements are signed and funded. Given this timeline, the TC’s requested in-servce date of January 1, 2018 is feasible. Additional schedule estimates will be identified in the Facilities Study. Disclaimer Nothing in this report constitutes an offer of transmission service or confers upon the Transmission Customer (“TC”) any right to receive transmission service nor does this report provide any guarantee or commit that APS will complete the project as proposed. It should also be noted that all results for the SIS are dependent upon the assumed new Path 23 rating, which is dependent upon topology and timing of new projects in the vicinity of Path 23, which are subject to change.


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APPENDIX A – Non-Simultaneous Study

Path 23 Transformer Addition – Non-Simultaneous Study 1

Four Corners 500/345 kV Transformer (Path 23) Upgrade Project

WECC Expedited Rating Study Comprehensive Progress Report Non Simultaneous Study

Submitted by Jonathan Stahlhut, PhD, PE TransCo.Energy, LLC

on behalf of

Arizona Public Service

March 17, 2016


TABLE OF CONTENTS

I. EXECUTIVE SUMMARY .................................................................................................. 3

II. STUDY OBJECTIVES AND PURPOSE ............................................................................ 5

III. PROJECT PLAN OF SERVICE ....................................................................................... 5

IV. NON-SIMULTANEOUS RESULTS ............................................................................... 6

IV.A Path 23 Westbound @ 1000 MW Study Results ............................................................... 8

IV.B Path 23 Eastbound @ 1000 MW Study Results ................................................................ 9

IV.C Path 23 Westbound @ 1420 MW Study Results............................................................. 10

IV.D Path 23 Eastbound @ 1420 MW Study Results .............................................................. 11

V. CONCLUSIONS................................................................................................................. 12

LIST OF APPENDICES

Appendix A: Contingency List Appendix B: One-Line Diagrams Appendix C: Reactive VAR Margin Study and Results Appendix D: Transient Stability Plots


I. EXECUTIVE SUMMARY

In response to multiple Transmission Service Requests (TSRs) Arizona Public Service Company (APS) i s planning to add a second 500/345 kV transformer at the Four Corners switching station in 2017. The Four Corners switching station is located near the Four Corners Generating Station, approximately 1 5 miles west of Farmington, New Mexico. The second transformer is expected to be constructed with similar components as the existing Four Corners 1AA 500/345 kV transformer (3 single phase units) with a continuous and emergency rating of 1025 and 1350 MVA respectively. The expected in-service date for the new transformer is December 2017.

Currently, the Four Corners 1AA 500/345 kV transformer solely comprises WECC Path 23 and has an existing bi-directional accepted rating of 1000 MW, which was determined in 20121. Following the addition of a second transformer, Path 23 will be redefined to include this new transformer. Figure 1 illustrates the transmission system in the vicinity of Path 23.

Results of the studies presented in this report show that the plan of service for the

addition of a 2nd transformer will support a new Path 23 bi-directional non-simultaneous rating of 1420 MW as measured at the 345 kV terminals of the two 500/345 kV transformers. Results of the thermal, transient and post-transient analyses show that, with the proposed plan of service for the upgrade project, operating Path 23 at a new rating of 1420 MW would not violate WECC/NERC Planning Standards or local reliability criteria.

Based on the proposed plan of service for the new transformer, APS will be initiating

the WECC Expedited Project Rating Review Process to obtain a new Accepted non-simultaneous rating for the path according to the WECC Overview of Policies and Procedures for Project Coordination Review, Project Rating Review, and Progress Reports.

Recent past assessments of Path 23 showed that there are simultaneous interactions

between the path and other transmission paths in Arizona. The expected simultaneous studies will include Path 23 vs Four Corners – Moenkopi 500 kV, Path 23 vs Four Corners – Cholla 345 kV 1&2, and Path 23 vs Four Corners Unit #5. These simultaneous relationships will be studied and documented in the final CPR report. It is expected that the Four Corners Technical Task Force will be asked to serve as a project review group for the Path 23 rating study by reviewing study plans, study cases and final results. Members of the task force are:

Salt River Project Tucson Electric Power Company

Southern California Edison Company El Paso Electric Company Public Service Company of New Mexico Western Area Power Administration DSW

Arizona Public Service Company

1 Four Corners 500/345 kV Transformer (Path 23) Upgrade Project-WECC Expedited Rating Study CPR, February 3, 2012.


Figure 1: Study Area


II. STUDY OBJECTIVES AND PURPOSE

The objective of this report is to demonstrate that the plan of service for the addition of a second transformer at Four Corners supports the proposed Path 23 non-simultaneous rating of 1420 MW while meeting WECC/NERC Planning Standards and local reliability criteria. Simultaneous studies will be conducted and coordinated through the Four Corners Technical Task Force at a later date and are not documented in this report. The studies conducted for the Path 23 non-simultaneous study are thermal, post transient, transient stability and reactive VAR margin analysis.

The following projects were included in all the cases since they represent the near term

scenario that was of interest for this study. The WECC case used in the analyses was the APS 2017 Heavy Summer peak case, which was coordinated through the SWAT-AZ subcommittee for use in TPL studies. Studies are conducted using PSLF version 19.0_01.

The study base case had the following approved transmission projects modeled.

• Palo Verde – Delaney – Sun Valley 500 kV • Southeast Valley Project • Pinal Central – Tortolita 500 kV • Four Corners – West Mesa 345 kV Rio Puerco Loop-in Project • Rio Puerco SVC • 2nd Yah-Ta-Hey 345/115kV Transformer • Four Corners 230 kV Reactors – 2 units @ 100 MVAR each • Mazatzal 346/69 kV substation • Cholla Unit #2 is retired

Appendix A shows a listing of the contingencies used in the analysis.

III. PROJECT PLAN OF SERVICE

The Plan of service for the proposed Project is the addition of the 2nd 500/345 kV transformer at Four Corners. Table 1 shows the pre- and post- project ratings for the transformer. The transformer is expected to be built with similar characteristics as the exiting 500/345 kV transformer. Figure 2 illustrates the proposed interconnection of the transformer into the existing 500 kV and 345 kV switchyards. The 500 kV connection is proposed with a back to back breaker configuration to avoid the loss of both transformers for a single breaker failure. The physical limitations of the yard prevent splitting the transformer terminations in any other manner.


Table 1. Path 23 component sections and ratings.

Element Pre-Project Post-Project

500/345 kV XFMR 1AA (Existing) 1025/1350 MVA 1025/1350 MVA

2nd 500/345 kV XFMR (New) N/A 1025/1350 MVA

Figure 2: Second Four Corners 500/345 kV Transformer Plan of Service

IV. NON-SIMULTANEOUS RESULTS

The WECC Project Rating Review guidelines is used in this analysis to determine the ability for Path 23 to transfer up to its current and proposed accepted ratings with the proposed plan of service modeled. The previous non-simultaneous rating of Path 23 (1000 MW) is used as the benchmark for this study. The determination of the path rating with the 2nd transformer is established during the course of stressing through the non-simultaneous study.


Table 2 details a summary of cases constructed and used to study the non- simultaneous conditions outlined in the study plan as well as the limiting results. In Table 3, a listing of cases used in the study along with detailed flow levels are shown. In Appendix B, one line diagrams of the study area for all base cases used in this study are provided.

Table 2. Pre- and post-project non-simultaneous cases.

Path Scenario Path 23 Flow Limitation Case Name Pre-Project WB 1000 MW Thermal N-0 p23_ns_001_w_1000.savPre-Project EB 1000 MW Thermal N-0 p23_ns_001_e_1000.sav

Post-Project WB 1420 MW Thermal N-1 p23_ns_001_w_1420.savPost-Project EB 1420 MW Thermal N-1 p23_ns_001_e_1420.sav

For all scenarios studied, the thermal results of the analyses show: 1. No transmission element was loaded above its continuous rating during pre-

disturbance. 2. No transmission element was loaded above its emergency rating following single

or double contingency outages. Results from the post-transient voltage and reactive margin analysis for the Path 23 non-

simultaneous scenario show that the plans of service for the upgrade project meets the WECC/NERC Planning Standards and local reliability criteria. In Appendix C, the selection of critical busses and resulting static VAR compensator output for all contingencies for the critical busses is provided. Results of the post-transient voltage analysis is provided in the detailed results following this section of the report. In summary, results for the both voltage and reactive margin analysis for the post- transient scenario show.

1. No Single outage contingencies (Category P1/P2 of TPL-001-4) violated the 5%

post-disturbance criteria or produced negative margin. 2. No Multiple outage contingencies (Category P3-P7 of TPL-001-4) violated the

10% post-disturbance criteria or produced negative margin. Transient stability results for the non-simultaneous analysis show that the plan of service

of the 2nd Four Corners 500/345 kV project meets the WECC/NERC Planning Standards and local reliability criteria for damping, synchronism, and voltage performance. Plots of the transient stability results from the non-simultaneous cases are provided in Appendix D. The following transient stability criteria is used to evaluate the study results. The criteria are consistent with the proposed WECC-0100 TPL-001-WECC-RBP-3 System Performance criteria.

• Following fault clearing, the voltage shall recover to 80% of the pre-contingency voltage within 20 seconds of the initiating events for all P1 through P7 events, for each applicable BES bus serving load.

• Following fault clearing and voltage recovery above 80%, voltage at each applicable BES bus serving load shall not dip below 70% of pre-contingency voltage for more than 30


cycles nor remain below 80% of pre-contingency voltage for more than two seconds, for all P1 through P7 events.

• For three phase faults, all oscillations that do not show positive damping within 10 seconds after the start of the studied event were continued out to 30 seconds. Oscillations that do not show positive damping after 30 seconds shall be deemed unstable.

• For three phase faults that do not show positive damping within 10 seconds were run as single line to ground faults.

Table 3. Detailed non-simultaneous case flows.

Case Analysis Path 23 (MW)

FC-MK (MW)

FC-CH 1&2 (MW)

1000 MW WB Thermal, Delta V, Transient Stability

1000.40 950.73 713.85 1000 MW EB -1002.22 -243.05 64.53 1420 MW WB 1423.35 1373.46 812.07 1420 MW EB -1421.41 -662.44 -74.62 1025 MW WB

Reactive VAR Margin

1025.39 975.67 722.19 1050 MW WB 1050.57 1000.80 735.55 1025 MW EB -1026.47 -267.35 46.91 1050 MW EB -1050.33 -291.26 29.27 1459 MW WB 1460.21 1410.26 835.02 1495 MW WB 1495.86 1445.85 845.67 1459 MW EB -1459.30 -700.39 -99.30 1495 MW EB -1496.50 -737.64 -123.67

IV.A Path 23 Westbound @ 1000 MW Study Results

The pre-project scenario of a westbound (345 kV to 500 kV direction) flow of 1000

MW was assessed. For the N-0 scenario, the path non-simultaneous rating of 1000 MW was confirmed. No contingencies were found to limit the rating less than the value stated in the WECC Path Rating Catalog. All thermal analyses met the WECC/NERC Planning Standards and local reliability criteria. Tables 4 and 5 show the thermal results, and any delta V results with a severity greater than -5% respectively.

For the planning scenario with Path 23 westbound at 1000 MW, the existing

500/345 kV transformer at Four Corners was loaded to 99% of its thermal rating.

Table 4. Path 23 1000 MW Westbound Non-Simultaneous Thermal Results

FROM NAME

FROM KV TO NAME

TO KV

CK ID CONTINGENCY DESCRIPTION RATING

Thermal Loading

(%)

FOURCORN 500 FOURCORN 345 1 Base system (n-0) 1025.0 98.93%

FOURCORN 500 FOURCORN 345 1 Cholla - Saguaro 500kV/ Coronado -

Silverking 500kV N-2 1350.0 98.51%


Table 5. Path 23 1000 MW Westbound Non-Simultaneous Delta V Results (> -%5 drop)

BUS # NAME KV CONTINGENCY DESCRIPTION Voltage Drop (%) 14001 FOURCORN 500 Four Corners - Moenkopi 500kV/Four Corners 500/345kV N-2 -6.12%

16106 VAIL2 345 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -5.33%

Reactive margin analysis was conducted with Path 23 flows at 105% and 102.5% of

path transfer increase per the Guide to WECC/NERC Planning Standards I.D.: Voltage Support and Reactive Power. For the non-simultaneous case with Path 23 flows at 1000 MW westbound, the 105% reactive power margin case showed positive margin at the three identified critical buses (Cholla 230 kV, Hogback 115 kV, and Rio Puerco 115 kV) for all single element outages. Reactive margin analysis on the 102.5% case, positive margin was also observed for multiple element outages. Appendix C provides a listing of the observed synchronous condenser reactive power output at the nose of the Q-V curve demonstrating the positive reactive power margins.

The transient stability assessment for the westbound 1000 MW case revealed no

violations of either planning standards or local reliability criteria for single and double element outages. Appendix D provides a selection of voltage, frequency, and rotor angle plots in the WECC system of the transient stability analysis results.

IV.B Path 23 Eastbound @ 1000 MW Study Results

The pre-project scenario of an eastbound (500 kV to 345 kV direction) flow of 1000 MW was assessed. For the N-0 scenario, the path non-simultaneous rating of 1000 MW was confirmed. No contingencies were found to limit the rating less than the value stated in the WECC Path Rating Catalog. All thermal analyses met the WECC/NERC Planning Standards and local reliability criteria. Tables 6 and 7 show the thermal results, and any delta V results with a severity greater than -5% respectively.

For the planning scenario with Path 23 eastbound at 1000 MW, the existing 500/345 kV transformer at Four Corners was loaded to 99% of its thermal rating.

Table 6. Path 23 1000 MW Eastbound Non-Simultaneous Thermal Results

FROM NAME

FROM KV TO NAME

TO KV


Thermal Loading

(%)

FOURCORN 500 FOURCORN 345 1 Base system (n-0) 1025.0 99.76%

Table 7. Path 23 1000 MW Eastbound Non-Simultaneous Delta V Results (> -%5 drop)

BUS # NAME KV CONTINGENCY DESCRIPTION Voltage Drop (%) 14001 FOURCORN 500 Four Corners - Moenkopi 500kV/Four Corners 500/345kV N-2 -6.60%


Reactive margin analysis was conducted with Path 23 flows at 105% and 102.5% of path transfer increase per the Guide to WECC/NERC Planning Standards I.D.: Voltage Support and Reactive Power. For the non-simultaneous case with Path 23 flows at 1000 MW eastbound, the 105% reactive power margin case showed positive margin at the three identified critical buses (Cholla 230 kV, Hogback 115 kV, and Rio Puerco 115 kV) for all single element outages. Reactive margin analysis on the 102.5% case, positive margin was also observed for multiple element outages. Appendix C provides a listing of the observed synchronous condenser reactive power output at the nose of the Q-V curve demonstrating the positive reactive power margins.

The transient stability assessment for the eastbound 1000 MW case revealed no violations of either planning standards or local reliability criteria for single and double element outages. Appendix D provides a selection of voltage, frequency, and rotor angle plots in the WECC system of the transient stability analysis results.

IV.C Path 23 Westbound @ 1420 MW Study Results The post-project scenario of a westbound flow of 1420 MW was assessed. For the N-0

scenario, a path non-simultaneous rating of 1420 MW was determined. All thermal analyses met the WECC/NERC Planning Standards and local reliability criteria. Tables 8 and 9 show the thermal results, and any delta V results with a severity greater than -5% respectively.

For the planning scenario with Path 23 westbound at 1420 MW, the outage of one

Four Corners 500/345 kV transformer loaded the other transformer to 99% of its emergency rating of 1350 MVA.

Table 8. Path 23 1420 MW Westbound Non-Simultaneous Thermal Results

FROM NAME

FROM KV TO NAME

TO KV


Thermal Loading

(%)

VAIL2 345 VAIL 138 1 Cholla - Saguaro 500kV/ Coronado -

Silverking 500kV N-2 806.0 99.79%

FOURCORN 500 FOURCORN 345 2 Four Corners 500/345kV 1AA 1350.0 99.99%

Table 9. Path 23 1420 MW Westbound Non-Simultaneous Delta V Results (> -%5 drop)

BUS # NAME KV CONTINGENCY DESCRIPTION Voltage Drop (%) 16106 VAIL2 345 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -6.32%

14103 PRECHCYN 345 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -6.15%

14107 MAZATZAL 345 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -6.11%

16902 FRISCO 230 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -5.21%

16903 PD-MORNC 230 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -5.21%

16901 COPPERVR 230 Cholla - Saguaro 500kV/ Coronado - Silverking 500kV N-2 -5.16%


Reactive margin analysis was conducted with Path 23 flows at 105% and 102.5% of path transfer increase per the Guide to WECC/NERC Planning Standards I.D.: Voltage Support and Reactive Power. For the non-simultaneous case with Path 23 flows at 1420 MW westbound, the 105% reactive power margin case showed positive margin at the three identified critical buses (Cholla 230 kV, Hogback 115 kV, and Rio Puerco 115 kV) for all single element outages. Reactive margin analysis on the 102.5% case, positive margin was also observed for multiple element outages. Appendix C provides a listing of the observed synchronous condenser reactive power output at the nose of the Q-V curve demonstrating the positive reactive power margins.

The transient stability assessment for the westbound 1420 MW case revealed no


IV.D Path 23 Eastbound @ 1420 MW Study Results The post-project scenario of an eastbound flow of 1420 MW was assessed. For the N-0

scenario, a path non-simultaneous rating of 1420 MW was determined. All thermal analyses met the WECC/NERC Planning Standards and local reliability criteria. Tables 10 and 11 show the thermal results, and any delta V results with a severity greater than -5% respectively.

For the planning scenario with Path 23 eastbound at 1420 MW, the outage of one Four

Corners 500/345 kV transformer loaded the other transformer to 99% of its emergency rating of 1350 MVA.

Table 10. Path 23 1420 MW Eastbound Non-Simultaneous Thermal Results

FROM NAME

FROM KV TO NAME

TO KV


Thermal Loading

(%)

ENRON_TS 115 MENDOZAT 115 1 Four Corners - Rio Puerco 345kV 58.0 98.32%

ENRON_TS 115 GALLUPPG 115 1 Four Corners - Rio Puerco 345kV 58.0 98.55%

FOURCORN 500 FOURCORN 345 2 Four Corners 500/345kV 1AA 1350.0 99.16%

Table 11. Path 23 1420 MW Eastbound Non-Simultaneous Delta V Results (> -%5 drop)

BUS # NAME KV CONTINGENCY DESCRIPTION Voltage Drop (%) None

Reactive margin analysis was conducted with Path 23 flows at 105% and 102.5% of

path transfer increase per the Guide to WECC/NERC Planning Standards I.D.: Voltage Support and Reactive Power. For the non-simultaneous case with Path 23 flows at 1420 MW eastbound, the 105% reactive power margin case showed positive margin at the three identified critical buses (Cholla 230 kV, Hogback 115 kV, and Rio Puerco 115 kV) for all single element outages. Reactive margin analysis on the 102.5% case, positive margin was also observed for


multiple element outages. Appendix C provides a listing of the observed synchronous condenser reactive power output at the nose of the Q-V curve demonstrating the positive reactive power margins.

The transient stability assessment for the eastbound 1420 MW case revealed no


V. CONCLUSIONS

Results from the power flow, post-transient stability and transient stability analyses demonstrate that the plan of service in support of a new non-simultaneous accepted rating for the Path 23 does not violate WECC/NERC Planning Standards or local reliability criteria. In addition, the analyses show that a new non-simultaneous bi-directional rating of 1420 MW can be achieved (measured at the 345 kV terminal) by the plan of service. Simultaneous interactions will be studied and documented in the final CPR report.

Appendix A - Path 23 Transformer Addition – Non-Simultaneous Study – Contingency List 1

Appendix A

WECC Path 23

Contingency List


Table A-1: WECC Path 23 Contingency List

Contingency TPL Contingency Type

Four Corners - Moenkopi 500kV P1.2

Four Corners - Pinto 345kV P1.2

Morgan - Pinnacle Peak 500kV P1.2

Cholla - Saguaro 500kV P1.2

Cholla - Sugarloaf 500kV P1.2

Coronado - Silverking 500kV P1.2

Four Corners 500/345kV 1AA P1.3

Four Corners Unit #5 P1.1

Four Corners Unit #4 P1.1

Four Corners 345/230kV P1.3

Cholla Unit #4 P1.1

Moenkopi - Eldorado 500kV P1.2

Coronado Unit #1 P1.1

Springerville Unit #4 P1.1

McKinley - Springerville 345kV P1.2

Springerville - Coronado 500kV P1.2

San Juan - McKinley 345kV P1.2

Coronado - Silverking 500kV P1.2

Four Corners - Rio Puerco 345kV P1.2

Pinnacle Peak West Bus 230kV P2.2

Pinnacle Peak Center Bus 230kV P2.2

Pinnacle Peak East Bus 230kV P2.2

Hassayampa - North Gila 500kV P1.2

Cholla West Bus 345kV P2.2

Cholla East Bus 345kV P2.2

Preacher Canyon - Pinnacle Peak 345kV + Transformers (#4 & #14 345/230kV) P2.4

Mazatzal - Pinnacle Peak 345kV + Transformers (#7 & #14 345/230kV) P2.4

Cholla - Saguaro 500kV + Coronado Silverking 500kV P6.1.1

Four Corners - Moenkopi 500kV + FC Unit #5 P3.2

Four Corners - Moenkopi 500kV + MK-Cedar Mt. 500kV P6.1.1

Four Corners - Moenkopi 500kV + FC 500/345kV P6.1.2

Cholla - Sugarloaf 500kV + Cholla 500/345kV #1 P6.1.2

Morgan - Pinnacle Peak 500kV + Raceway-Pinnacle Peak 230kV P7.1

Palo Verde - Colorado River 500kV P1.2

Cholla-Preacher Canyon 345kV + Cholla - Mazatzal 345kV P6.1.1

Four Corners - Cholla 345kV 1 and 2 P6.1.1

Pinnacle Peak - Mazatzal 345kV P1.2

Cholla - Preacher Canyon 345kV P1.2


Contingency TPL Contingency Type

Cholla - Mazatzal 345kV P1.2

Four Corners - Cholla 345kV #2 P1.2

Four Corners - Shiprock 230kV P1.2

Four Corners - San Juan 345kV P1.2

Appendix B

WECC Path 23

One Line Diagrams

Path 23 Rating StudyWestbound 1000 MW Non-Simultaneous Case

MW/MVAR

Rating = 1C:\PSLF_APS\

General Electric International, Inc. PSLF Program Fri Feb 19 13:05:41 2016 C:\PSLF_APS\cases\p23_ns_001_w_1000.sav

26044MARKETPL

535.41.071

26048MCCULLGH

535.31.071

26123CRYSTAL 534.4

1.069

19038MEAD

536.11.072

15034PERKINS

530.01.060

14005WESTWING 530.0

1.06015021PALOVRDE

532.51.065

24900COLRIVER

526.71.053

14012DELANEY

533.01.066

14010SNVLY

532.51.065

15061RUDD

531.81.064

15090HASSYAMP

533.21.066

15089JOJOBA

535.21.070

15088PINAL_W

535.71.071

14007GILARIVR 537.7

1.075

15087DUKE

536.51.073

15011KYRENE

527.61.055

15080

PINAL_C

536.91.074

15051BROWNING

529.51.059

24042ELDORDO

535.41.071

19037MEAD

348.51.010

19315PEACOCK

355.01.029

19053LIBERTY

356.51.033

14002MOENKOPI

539.11.078

14003NAVAJO

539.81.080

16000TORTOLIT 537.3

1.075

66355SIGURDPS

241.21.049

79031GLENCANY

233.61.016

79028GLEN PS

233.81.017

79093NAVAJO

234.01.017

79096LNGHOUSE

234.01.017

79043KAYENTA

234.01.017

79063SHIPROCK

234.71.020

79061SHIP PS

232.61.011

79032GLENCANY 352.2

1.021

79045LOSTCANY

231.61.007

79024FLAGSTAF 356.1

1.032

79053PINPKBRB 355.8

1.031

14011MORGAN 531.4

1.063

14018DUGAS 536.3

1.073

14006YAVAPAI 533.1

1.066

14016PNPKAPS 529.4

1.059

14014CEDARMT

536.81.074

14001FOURCORN

530.61.061

14101FOURCORN

352.5

1.02266235PINTO PS

349.11.012

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.51.027

SANJN PS

14100CHOLLA

352.91.023

14102PNPKAPS

353.41.024

MAZATZAL

PRECHCYN

14000CHOLLA

534.21.068

14004SAGUARO

537.31.075

16102MCKINLEY 361.7

1.048

16104SPRINGR 360.5

1.045

16100CORONADO 359.9

1.043

SGRLF

15001CORONADO 534.7

1.069

15041SILVERKG

528.31.057

16107WESTWING 352.1

1.021

16114PINALWES

359.01.040

16103SOUTH 356.1

1.032

22536N.GILA

530.71.061

22342HDWSH

531.11.062

10390RIOPUERC

358.11.038

MACHO_SPRNGS

VAIL2 GREENLEE

Path 23 Expedited Rating Study

FC-CH Flow = 713.6 MW

Path 23 Flow = 1000.1 MW

FCMK Flow = 950.4 MW

1.000

Path 23 Rating StudyWestbound 1420 MW Non-Simultaneous Case

MW/MVAR


General Electric International, Inc. PSLF Program Fri Feb 19 13:06:23 2016 C:\PSLF_APS\cases\p23_ns_001_w_1420.sav

26044MARKETPL

534.51.069

26048MCCULLGH

534.41.069

26123CRYSTAL 533.2

1.066

19038MEAD

535.11.070

15034PERKINS

528.81.058

14005WESTWING 528.8

1.05815021PALOVRDE

532.51.065

24900COLRIVER

526.31.053

14012DELANEY

533.01.066

14010SNVLY

532.51.065

15061RUDD

531.51.063

15090HASSYAMP

533.11.066

15089JOJOBA

535.01.070

15088PINAL_W

535.71.071

14007GILARIVR 537.6

1.075

15087DUKE

536.51.073

15011KYRENE

526.61.053

15080

PINAL_C

536.41.073

15051BROWNING

528.21.056

24042ELDORDO

534.31.069

19037MEAD

348.01.009

19315PEACOCK

354.41.027

19053LIBERTY

356.21.032

14002MOENKOPI

534.01.068

14003NAVAJO

535.11.070

16000TORTOLIT 536.8

1.074

66355SIGURDPS

241.21.049

79031GLENCANY

232.61.011

79028GLEN PS

232.51.011

79093NAVAJO

232.51.011

79096LNGHOUSE

231.91.008

79043KAYENTA

231.81.008

79063SHIPROCK

233.51.015

79061SHIP PS

230.11.000

79032GLENCANY 351.1

1.018

79045LOSTCANY

225.90.982

79024FLAGSTAF 354.5

1.028

79053PINPKBRB 354.2

1.027

14011MORGAN 530.0

1.060

14018DUGAS 534.1

1.068

14006YAVAPAI 530.5

1.061

14016PNPKAPS 527.9

1.056

14014CEDARMT

532.31.065

14001FOURCORN

526.81.054

14101FOURCORN

350.7

1.01666235PINTO PS

344.81.000

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.11.026

SANJN PS

14100CHOLLA

349.61.013

14102PNPKAPS

351.01.017

MAZATZAL

PRECHCYN

14000CHOLLA

530.81.062

14004SAGUARO

536.81.074

16102MCKINLEY 362.4

1.051

16104SPRINGR 360.8

1.046

16100CORONADO 359.0

1.041

SGRLF

15001CORONADO 532.7

1.065

15041SILVERKG

525.71.051

16107WESTWING 351.5

1.019

16114PINALWES

359.01.041

16103SOUTH 355.9

1.032

22536N.GILA

529.41.059

22342HDWSH

530.01.060

10390RIOPUERC

357.91.038

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyEastbound 1000 MW Non-Simultaneous Case

MW/MVAR

Rating = 1

General Electric International, Inc. PSLF Program Fri Feb 19 12:52:09 2016 C:\PSLF_APS\cases\p23_ns_001_e_1000.sav

26044MARKETPL

544.41.089

26048MCCULLGH

544.31.089

26123CRYSTAL 542.0

1.084

19038MEAD

543.01.086

15034PERKINS

525.91.052

14005WESTWING 525.9

1.05215021PALOVRDE

532.51.065

24900COLRIVER

535.61.071

14012DELANEY

532.61.065

14010SNVLY

531.61.063

15061RUDD

527.81.056

15090HASSYAMP

533.11.066

15089JOJOBA

532.51.065

15088PINAL_W

530.71.061

14007GILARIVR 535.4

1.071

15087DUKE

531.71.063

15011KYRENE

523.31.047

15080

PINAL_C

533.31.067

15051BROWNING

526.71.053

24042ELDORDO

544.51.089

19037MEAD

352.01.020

19315PEACOCK

355.91.032

19053LIBERTY

358.31.039

14002MOENKOPI

541.91.084

14003NAVAJO

542.51.085

16000TORTOLIT 534.9

1.070

66355SIGURDPS

234.01.017

79031GLENCANY

231.71.008

79028GLEN PS

233.11.014

79093NAVAJO

233.51.015

79096LNGHOUSE

235.51.024

79043KAYENTA

236.11.026

79063SHIPROCK

236.51.028

79061SHIP PS

237.01.030

79032GLENCANY 351.2

1.018

79045LOSTCANY

237.71.033

79024FLAGSTAF 357.3

1.036

79053PINPKBRB 357.2

1.035

14011MORGAN 527.1

1.054

14018DUGAS 532.3

1.065

14006YAVAPAI 531.3

1.063

14016PNPKAPS 525.2

1.050

14014CEDARMT

537.91.076

14001FOURCORN

533.01.066

14101FOURCORN

354.5

1.02766235PINTO PS

354.41.027

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.91.029

SANJN PS

14100CHOLLA

360.21.044

14102PNPKAPS

348.41.010

MAZATZAL

PRECHCYN

14000CHOLLA

538.51.077

14004SAGUARO

534.91.070

16102MCKINLEY 361.4

1.048

16104SPRINGR 360.3

1.044

16100CORONADO 360.3

1.044

SGRLF

15001CORONADO 534.3

1.069

15041SILVERKG

529.71.059

16107WESTWING 348.8

1.011

16114PINALWES

355.01.029

16103SOUTH 354.9

1.029

22536N.GILA

537.41.075

22342HDWSH

536.11.072

10390RIOPUERC

352.41.021

MACHO_SPRNGS

VAIL2 GREENLEE



Path 23 Flow = -1002.2 MW

FCMK Flow = -243.1 MW

1.000

Path 23 Rating StudyEastbound 1420 MW Non-Simultaneous Case

MW/MVAR


General Electric International, Inc. PSLF Program Fri Feb 19 13:05:05 2016 C:\PSLF_APS\cases\p23_ns_001_e_1420.sav

26044MARKETPL

546.21.092

26048MCCULLGH

546.11.092

26123CRYSTAL 543.4

1.087

19038MEAD

544.61.089

15034PERKINS

527.61.055

14005WESTWING 527.6

1.05515021PALOVRDE

532.51.065

24900COLRIVER

535.21.070

14012DELANEY

532.81.066

14010SNVLY

532.01.064

15061RUDD

529.81.060

15090HASSYAMP

533.11.066

15089JOJOBA

532.71.065

15088PINAL_W

529.91.060

14007GILARIVR 535.6

1.071

15087DUKE

531.31.063

15011KYRENE

525.41.051

15080

PINAL_C

533.41.067

15051BROWNING

528.61.057

24042ELDORDO

546.21.092

19037MEAD

352.71.022

19315PEACOCK

356.51.033

19053LIBERTY

359.31.042

14002MOENKOPI

541.31.083

14003NAVAJO

542.71.085

16000TORTOLIT 534.7

1.069

66355SIGURDPS

235.81.025

79031GLENCANY

232.81.012

79028GLEN PS

233.91.017

79093NAVAJO

234.21.018

79096LNGHOUSE

235.61.024

79043KAYENTA

236.01.026

79063SHIPROCK

236.41.028

79061SHIP PS

237.21.031

79032GLENCANY 352.4

1.021

79045LOSTCANY

237.61.033

79024FLAGSTAF 359.4

1.042

79053PINPKBRB 360.0

1.043

14011MORGAN 529.1

1.058

14018DUGAS 533.5

1.067

14006YAVAPAI 532.2

1.064

14016PNPKAPS 527.9

1.056

14014CEDARMT

537.61.075

14001FOURCORN

533.01.066

14101FOURCORN

353.9

1.02666235PINTO PS

353.61.025

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.81.028

SANJN PS

14100CHOLLA

359.71.042

14102PNPKAPS

351.21.018

MAZATZAL

PRECHCYN

14000CHOLLA

542.01.084

14004SAGUARO

534.71.069

16102MCKINLEY 358.6

1.040

16104SPRINGR 354.7

1.028

16100CORONADO 353.9

1.026

SGRLF

15001CORONADO 537.2

1.074

15041SILVERKG

532.41.065

16107WESTWING 349.1

1.012

16114PINALWES

353.31.024

16103SOUTH 351.8

1.020

22536N.GILA

538.31.077

22342HDWSH

536.81.074

10390RIOPUERC

352.51.022

MACHO_SPRNGS

VAIL2 GREENLEE


FC-CH Flow = -74.6 MW



1.000

Path 23 Rating StudyWestbound 1000 MW Non-Simultaneous 102.5% Reactive Margin Case

MW/MVAR


General Electric International, Inc. PSLF Program Fri Feb 19 13:05:56 2016 C:\PSLF_APS\cases\p23_ns_001_w_1025_RM.sav

26044MARKETPL

535.51.071

26048MCCULLGH

535.41.071

26123CRYSTAL 534.5

1.069

19038MEAD

536.21.072

15034PERKINS

529.91.060

14005WESTWING 529.9

1.06015021PALOVRDE

532.51.065

24900COLRIVER

526.71.053

14012DELANEY

533.01.066

14010SNVLY

532.51.065

15061RUDD

531.81.064

15090HASSYAMP

533.21.066

15089JOJOBA

535.11.070

15088PINAL_W

535.71.071

14007GILARIVR 537.7

1.075

15087DUKE

536.51.073

15011KYRENE

527.51.055

15080

PINAL_C

536.91.074

15051BROWNING

529.41.059

24042ELDORDO

535.41.071

19037MEAD

348.51.010

19315PEACOCK

354.91.029

19053LIBERTY

356.51.033

14002MOENKOPI

539.01.078

14003NAVAJO

539.81.080

16000TORTOLIT 537.3

1.075

66355SIGURDPS

241.11.048

79031GLENCANY

233.51.015

79028GLEN PS

233.71.016

79093NAVAJO

233.91.017

79096LNGHOUSE

233.91.017

79043KAYENTA

233.81.017

79063SHIPROCK

234.61.020

79061SHIP PS

232.41.011

79032GLENCANY 352.1

1.021

79045LOSTCANY

231.41.006

79024FLAGSTAF 356.0

1.032

79053PINPKBRB 355.7

1.031

14011MORGAN 531.4

1.063

14018DUGAS 536.4

1.073

14006YAVAPAI 533.1

1.066

14016PNPKAPS 529.4

1.059

14014CEDARMT

536.71.073

14001FOURCORN

530.11.060

14101FOURCORN

352.4

1.02166235PINTO PS

349.01.012

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.51.027

SANJN PS

14100CHOLLA

352.71.022

14102PNPKAPS

353.21.024

MAZATZAL

PRECHCYN

14000CHOLLA

534.01.068

14004SAGUARO

537.31.075

16102MCKINLEY 361.6

1.048

16104SPRINGR 360.5

1.045

16100CORONADO 359.8

1.043

SGRLF

15001CORONADO 534.5

1.069

15041SILVERKG

528.01.056

16107WESTWING 352.1

1.020

16114PINALWES

359.01.041

16103SOUTH 355.9

1.032

22536N.GILA

530.71.061

22342HDWSH

531.11.062

10390RIOPUERC

358.11.038

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyWestbound 1000 MW Non-Simultaneous 105% Reactive Margin Case

MW/MVAR



26044MARKETPL

535.61.071

26048MCCULLGH

535.51.071

26123CRYSTAL 534.6

1.069

19038MEAD

536.21.072

15034PERKINS

529.91.060

14005WESTWING 529.9

1.06015021PALOVRDE

532.51.065

24900COLRIVER

526.71.053

14012DELANEY

533.01.066

14010SNVLY

532.51.065

15061RUDD

531.81.064

15090HASSYAMP

533.21.066

15089JOJOBA

535.11.070

15088PINAL_W

535.61.071

14007GILARIVR 537.7

1.075

15087DUKE

536.51.073

15011KYRENE

527.41.055

15080

PINAL_C

536.81.074

15051BROWNING

529.31.059

24042ELDORDO

535.51.071

19037MEAD

348.51.010

19315PEACOCK

354.91.029

19053LIBERTY

356.51.033

14002MOENKOPI

538.81.078

14003NAVAJO

539.61.079

16000TORTOLIT 537.2

1.074

66355SIGURDPS

241.01.048

79031GLENCANY

233.41.015

79028GLEN PS

233.61.015

79093NAVAJO

233.71.016

79096LNGHOUSE

233.61.016

79043KAYENTA

233.51.015

79063SHIPROCK

234.41.019

79061SHIP PS

231.81.008

79032GLENCANY 352.0

1.020

79045LOSTCANY

230.51.002

79024FLAGSTAF 355.9

1.032

79053PINPKBRB 355.6

1.031

14011MORGAN 531.3

1.063

14018DUGAS 536.4

1.073

14006YAVAPAI 533.0

1.066

14016PNPKAPS 529.3

1.059

14014CEDARMT

536.61.073

14001FOURCORN

529.61.059

14101FOURCORN

352.3

1.02166235PINTO PS

349.21.012

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.41.027

SANJN PS

14100CHOLLA

352.41.021

14102PNPKAPS

353.01.023

MAZATZAL

PRECHCYN

14000CHOLLA

533.71.067

14004SAGUARO

537.21.074

16102MCKINLEY 361.5

1.048

16104SPRINGR 360.4

1.045

16100CORONADO 359.7

1.043

SGRLF

15001CORONADO 534.3

1.069

15041SILVERKG

527.91.056

16107WESTWING 352.0

1.020

16114PINALWES

359.01.040

16103SOUTH 355.9

1.031

22536N.GILA

530.71.061

22342HDWSH

531.11.062

10390RIOPUERC

358.11.038

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyWestbound 1420 MW Non-Simultaneous 102.5% Reactive Margin Case

MW/MVAR



26044MARKETPL

534.31.069

26048MCCULLGH

534.21.068

26123CRYSTAL 533.0

1.066

19038MEAD

535.01.070

15034PERKINS

528.61.057

14005WESTWING 528.6

1.05715021PALOVRDE

532.51.065

24900COLRIVER

526.21.052

14012DELANEY

533.01.066

14010SNVLY

532.41.065

15061RUDD

531.41.063

15090HASSYAMP

533.11.066

15089JOJOBA

535.01.070

15088PINAL_W

535.71.071

14007GILARIVR 537.6

1.075

15087DUKE

536.41.073

15011KYRENE

526.51.053

15080

PINAL_C

536.21.072

15051BROWNING

528.01.056

24042ELDORDO

534.11.068

19037MEAD

347.91.008

19315PEACOCK

354.41.027

19053LIBERTY

356.11.032

14002MOENKOPI

533.41.067

14003NAVAJO

534.71.069

16000TORTOLIT 536.6

1.073

66355SIGURDPS

241.51.050

79031GLENCANY

232.71.012

79028GLEN PS

232.41.011

79093NAVAJO

232.51.011

79096LNGHOUSE

231.71.007

79043KAYENTA

231.51.006

79063SHIPROCK

233.41.015

79061SHIP PS

229.80.999

79032GLENCANY 351.2

1.018

79045LOSTCANY

223.40.971

79024FLAGSTAF 354.6

1.028

79053PINPKBRB 354.2

1.027

14011MORGAN 529.9

1.060

14018DUGAS 533.8

1.068

14006YAVAPAI 530.1

1.060

14016PNPKAPS 527.7

1.055

14014CEDARMT

531.71.063

14001FOURCORN

526.01.052

14101FOURCORN

350.5

1.01666235PINTO PS

344.50.998

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.01.026

SANJN PS

14100CHOLLA

349.11.012

14102PNPKAPS

350.61.016

MAZATZAL

PRECHCYN

14000CHOLLA

530.31.061

14004SAGUARO

536.61.073

16102MCKINLEY 362.3

1.050

16104SPRINGR 360.6

1.045

16100CORONADO 358.7

1.040

SGRLF

15001CORONADO 532.3

1.065

15041SILVERKG

525.31.051

16107WESTWING 351.4

1.019

16114PINALWES

358.91.040

16103SOUTH 355.6

1.031

22536N.GILA

529.31.059

22342HDWSH

529.91.060

10390RIOPUERC

357.91.037

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyWestbound 1420 MW Non-Simultaneous 105% Reactive Margin Case

MW/MVAR



26044MARKETPL

534.21.068

26048MCCULLGH

534.01.068

26123CRYSTAL 532.8

1.066

19038MEAD

534.81.070

15034PERKINS

528.41.057

14005WESTWING 528.4

1.05715021PALOVRDE

532.51.065

24900COLRIVER

526.01.052

14012DELANEY

533.01.066

14010SNVLY

532.41.065

15061RUDD

531.41.063

15090HASSYAMP

533.11.066

15089JOJOBA

535.01.070

15088PINAL_W

535.61.071

14007GILARIVR 537.5

1.075

15087DUKE

536.21.072

15011KYRENE

526.21.052

15080

PINAL_C

536.01.072

15051BROWNING

527.61.055

24042ELDORDO

533.91.068

19037MEAD

347.81.008

19315PEACOCK

354.31.027

19053LIBERTY

356.11.032

14002MOENKOPI

532.51.065

14003NAVAJO

534.01.068

16000TORTOLIT 536.4

1.073

66355SIGURDPS

241.61.050

79031GLENCANY

232.71.012

79028GLEN PS

232.31.010

79093NAVAJO

232.31.010

79096LNGHOUSE

231.31.006

79043KAYENTA

231.01.004

79063SHIPROCK

233.01.013

79061SHIP PS

229.70.999

79032GLENCANY 351.1

1.018

79045LOSTCANY

223.70.973

79024FLAGSTAF 354.4

1.027

79053PINPKBRB 354.0

1.026

14011MORGAN 529.6

1.059

14018DUGAS 533.5

1.067

14006YAVAPAI 529.6

1.059

14016PNPKAPS 527.4

1.055

14014CEDARMT

531.01.062

14001FOURCORN

524.01.048

14101FOURCORN

349.4

1.01366235PINTO PS

339.00.983

10292SAN_JUAN

354.21.027

79064SHIPROCK

353.21.024

SANJN PS

14100CHOLLA

348.31.010

14102PNPKAPS

350.21.015

MAZATZAL

PRECHCYN

14000CHOLLA

529.51.059

14004SAGUARO

536.31.073

16102MCKINLEY 361.9

1.049

16104SPRINGR 360.4

1.045

16100CORONADO 358.2

1.038

SGRLF

15001CORONADO 531.6

1.063

15041SILVERKG

524.61.049

16107WESTWING 351.3

1.018

16114PINALWES

358.81.040

16103SOUTH 355.0

1.029

22536N.GILA

529.11.058

22342HDWSH

529.81.060

10390RIOPUERC

357.81.037

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyEastbound 1000 MW Non-Simultaneous 102.5% Reactive Margin Case

MW/MVAR

Rating = 1

General Electric International, Inc. PSLF Program Fri Feb 19 12:54:00 2016 C:\PSLF_APS\cases\p23_ns_001_e_1025_RM.sav

26044MARKETPL

544.21.088

26048MCCULLGH

544.21.088

26123CRYSTAL 541.9

1.084

19038MEAD

542.81.086

15034PERKINS

525.81.052

14005WESTWING 525.8

1.05215021PALOVRDE

532.51.065

24900COLRIVER

535.71.071

14012DELANEY

532.61.065

14010SNVLY

531.61.063

15061RUDD

527.71.055

15090HASSYAMP

533.11.066

15089JOJOBA

532.51.065

15088PINAL_W

530.71.061

14007GILARIVR 535.4

1.071

15087DUKE

531.61.063

15011KYRENE

523.31.047

15080

PINAL_C

533.21.066

15051BROWNING

526.61.053

24042ELDORDO

544.41.089

19037MEAD

352.01.020

19315PEACOCK

355.81.031

19053LIBERTY

358.21.038

14002MOENKOPI

541.81.084

14003NAVAJO

542.41.085

16000TORTOLIT 534.8

1.070

66355SIGURDPS

234.01.017

79031GLENCANY

231.71.007

79028GLEN PS

233.11.013

79093NAVAJO

233.51.015

79096LNGHOUSE

235.51.024

79043KAYENTA

236.01.026

79063SHIPROCK

236.51.028

79061SHIP PS

236.91.030

79032GLENCANY 351.1

1.018

79045LOSTCANY

237.61.033

79024FLAGSTAF 357.2

1.035

79053PINPKBRB 357.2

1.035

14011MORGAN 527.0

1.054

14018DUGAS 532.1

1.064

14006YAVAPAI 531.1

1.062

14016PNPKAPS 525.1

1.050

14014CEDARMT

537.71.075

14001FOURCORN

532.81.066

14101FOURCORN

354.4

1.02766235PINTO PS

354.61.028

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.91.029

SANJN PS

14100CHOLLA

360.21.044

14102PNPKAPS

348.31.010

MAZATZAL

PRECHCYN

14000CHOLLA

538.51.077

14004SAGUARO

534.91.070

16102MCKINLEY 361.4

1.048

16104SPRINGR 360.4

1.045

16100CORONADO 360.3

1.044

SGRLF

15001CORONADO 534.4

1.069

15041SILVERKG

529.71.059

16107WESTWING 348.8

1.011

16114PINALWES

354.91.029

16103SOUTH 354.9

1.029

22536N.GILA

537.41.075

22342HDWSH

536.11.072

10390RIOPUERC

352.41.021

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyEastbound 1000 MW Non-Simultaneous 105% Reactive Margin Case

MW/MVAR

Rating = 1


26044MARKETPL

544.11.088

26048MCCULLGH

544.11.088

26123CRYSTAL 541.7

1.083

19038MEAD

542.61.085

15034PERKINS

525.71.051

14005WESTWING 525.7

1.05115021PALOVRDE

532.51.065

24900COLRIVER

535.71.071

14012DELANEY

532.61.065

14010SNVLY

531.51.063

15061RUDD

527.71.055

15090HASSYAMP

533.11.066

15089JOJOBA

532.41.065

15088PINAL_W

530.61.061

14007GILARIVR 535.4

1.071

15087DUKE

531.51.063

15011KYRENE

523.21.046

15080

PINAL_C

533.11.066

15051BROWNING

526.61.053

24042ELDORDO

544.21.088

19037MEAD

351.91.020

19315PEACOCK

355.71.031

19053LIBERTY

358.11.038

14002MOENKOPI

541.61.083

14003NAVAJO

542.31.085

16000TORTOLIT 534.8

1.070

66355SIGURDPS

233.91.017

79031GLENCANY

231.71.007

79028GLEN PS

233.11.013

79093NAVAJO

233.51.015

79096LNGHOUSE

235.41.023

79043KAYENTA

236.01.026

79063SHIPROCK

236.41.028

79061SHIP PS

236.91.030

79032GLENCANY 351.1

1.018

79045LOSTCANY

237.51.033

79024FLAGSTAF 357.2

1.035

79053PINPKBRB 357.1

1.035

14011MORGAN 526.9

1.054

14018DUGAS 532.0

1.064

14006YAVAPAI 531.0

1.062

14016PNPKAPS 525.0

1.050

14014CEDARMT

537.51.075

14001FOURCORN

532.61.065

14101FOURCORN

354.4

1.02766235PINTO PS

354.91.029

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.91.029

SANJN PS

14100CHOLLA

360.31.044

14102PNPKAPS

348.31.010

MAZATZAL

PRECHCYN

14000CHOLLA

538.61.077

14004SAGUARO

534.81.070

16102MCKINLEY 361.4

1.047

16104SPRINGR 360.4

1.045

16100CORONADO 360.3

1.044

SGRLF

15001CORONADO 534.4

1.069

15041SILVERKG

529.71.059

16107WESTWING 348.7

1.011

16114PINALWES

354.81.028

16103SOUTH 354.9

1.029

22536N.GILA

537.41.075

22342HDWSH

536.21.072

10390RIOPUERC

352.41.021

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyEastbound 1420 MW Non-Simultaneous 102.5% Reactive Margin Case

MW/MVAR



26044MARKETPL

545.91.092

26048MCCULLGH

545.91.092

26123CRYSTAL 543.2

1.086

19038MEAD

544.31.089

15034PERKINS

527.41.055

14005WESTWING 527.4

1.05515021PALOVRDE

532.51.065

24900COLRIVER

535.31.071

14012DELANEY

532.81.066

14010SNVLY

532.01.064

15061RUDD

529.71.059

15090HASSYAMP

533.11.066

15089JOJOBA

532.71.065

15088PINAL_W

529.71.059

14007GILARIVR 535.6

1.071

15087DUKE

531.21.062

15011KYRENE

525.21.050

15080

PINAL_C

533.31.067

15051BROWNING

528.41.057

24042ELDORDO

546.01.092

19037MEAD

352.61.022

19315PEACOCK

356.41.033

19053LIBERTY

359.11.041

14002MOENKOPI

540.91.082

14003NAVAJO

542.41.085

16000TORTOLIT 534.5

1.069

66355SIGURDPS

235.81.025

79031GLENCANY

232.71.012

79028GLEN PS

233.91.017

79093NAVAJO

234.11.018

79096LNGHOUSE

235.41.024

79043KAYENTA

235.91.026

79063SHIPROCK

236.41.028

79061SHIP PS

237.11.031

79032GLENCANY 352.3

1.021

79045LOSTCANY

237.51.033

79024FLAGSTAF 359.3

1.041

79053PINPKBRB 359.9

1.043

14011MORGAN 528.8

1.058

14018DUGAS 533.2

1.066

14006YAVAPAI 531.9

1.064

14016PNPKAPS 527.7

1.055

14014CEDARMT

537.21.074

14001FOURCORN

532.71.065

14101FOURCORN

353.8

1.02566235PINTO PS

353.91.026

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.71.028

SANJN PS

14100CHOLLA

359.61.042

14102PNPKAPS

351.11.018

MAZATZAL

PRECHCYN

14000CHOLLA

542.01.084

14004SAGUARO

534.61.069

16102MCKINLEY 358.6

1.039

16104SPRINGR 354.7

1.028

16100CORONADO 353.9

1.026

SGRLF

15001CORONADO 537.1

1.074

15041SILVERKG

532.41.065

16107WESTWING 348.9

1.011

16114PINALWES

353.21.024

16103SOUTH 351.7

1.020

22536N.GILA

538.31.077

22342HDWSH

536.91.074

10390RIOPUERC

352.41.022

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Path 23 Rating StudyEastbound 1420 MW Non-Simultaneous 105% Reactive Margin Case

MW/MVAR



26044MARKETPL

546.01.092

26048MCCULLGH

545.91.092

26123CRYSTAL 543.2

1.086

19038MEAD

544.41.089

15034PERKINS

527.21.054

14005WESTWING 527.2

1.05415021PALOVRDE

532.51.065

24900COLRIVER

535.31.071

14012DELANEY

532.81.066

14010SNVLY

532.01.064

15061RUDD

529.61.059

15090HASSYAMP

533.11.066

15089JOJOBA

532.61.065

15088PINAL_W

529.51.059

14007GILARIVR 535.6

1.071

15087DUKE

531.01.062

15011KYRENE

525.11.050

15080

PINAL_C

533.11.066

15051BROWNING

528.31.057

24042ELDORDO

546.11.092

19037MEAD

352.81.022

19315PEACOCK

356.41.033

19053LIBERTY

359.01.041

14002MOENKOPI

540.61.081

14003NAVAJO

542.31.085

16000TORTOLIT 534.4

1.069

66355SIGURDPS

235.81.025

79031GLENCANY

232.61.012

79028GLEN PS

233.81.016

79093NAVAJO

234.01.018

79096LNGHOUSE

235.21.023

79043KAYENTA

235.71.025

79063SHIPROCK

236.31.027

79061SHIP PS

237.11.031

79032GLENCANY 352.3

1.021

79045LOSTCANY

237.51.032

79024FLAGSTAF 359.2

1.041

79053PINPKBRB 359.8

1.043

14011MORGAN 528.6

1.057

14018DUGAS 533.0

1.066

14006YAVAPAI 531.7

1.063

14016PNPKAPS 527.5

1.055

14014CEDARMT

536.91.074

14001FOURCORN

532.31.065

14101FOURCORN

353.7

1.02566235PINTO PS

354.21.027

10292SAN_JUAN

355.01.029

79064SHIPROCK

354.71.028

SANJN PS

14100CHOLLA

359.61.042

14102PNPKAPS

351.01.017

MAZATZAL

PRECHCYN

14000CHOLLA

542.01.084

14004SAGUARO

534.41.069

16102MCKINLEY 358.5

1.039

16104SPRINGR 354.7

1.028

16100CORONADO 353.9

1.026

SGRLF

15001CORONADO 537.1

1.074

15041SILVERKG

532.31.065

16107WESTWING 348.8

1.011

16114PINALWES

353.01.023

16103SOUTH 351.7

1.019

22536N.GILA

538.41.077

22342HDWSH

536.91.074

10390RIOPUERC

352.41.022

MACHO_SPRNGS

VAIL2 GREENLEE





1.000

Appendix C - Path 23 Transformer Addition – Non-Simultaneous Study - Reactive Margin Study 1

Appendix C

WECC Path 23

Reactive Power Margin Results


Q-V curve analysis are conducted to demonstrate positive reactive power margin at critical busses in the Path 23 rating study. Guide to WECC/NERC Rating Standards I.D.: Voltage Support and Reactive Power (“WECC Guide”) is used as a guide to perform the analysis. In this study, Q-V curve analysis was performed on all non-simultaneous cases utilizing the following:

• Non-simultaneous flow case depicting single element disturbance at the critical bus with path flow at 105% above the reported rating.

• Non-simultaneous flow case depicting multiple element disturbance at the critical bus with path flow at 105% above the reported rating.

The critical busses used in the analysis are: Cholla 230kV, Hogbak 115kV, Rio Puerco 115kV. The Section 7 of WECC’s Voltage Stability Criteria, Undervoltage Load Shedding Strategy, and Reactive Power Reserve Monitoring Methodology documents a methodology in determining the critical busses. The critical bus selection methodology can be summarized as:

1. Start with base case that simulate adverse conditions. 2. Develop Q-V curves for a number of busses on a number of single and multiple outages

to determine the most restrictive contingencies and the “weakest” bus in the study area.

The 105% stressed westbound 1420MW Path 23 case was used in the critical bus selection, with all study contingencies simulated from Appendix A. A sampling of busses within Arizona and New Mexico are used to determine potential critical busses. Table C-1 illustrates the worst performing busses with respect to VAR margin, and the top 3 are chosen as critical busses for the Path 23 study.

Table C-1: Q-V Curve Critical Bus Selection – Worst VAR Margin Results Bus VAR Margin Contingency

Cholla 230kV 170.1 Cholla West 345kV Bus Outage

Hogbak 115kV 295.9 Cholla – Saguaro 500kV and Coronado – Silverking

500kV Rio Puerco 115kV 313.4 Four Corners – Rio Puerco

345kV Shiprock 230kV 683.7 Four Corners Generator #4 Cholla 345kV 772.1 Cholla – Saguaro 500kV and

Coronado – Silverking 500kV Four Corners 230kV 798.9 Four Corners – Cholla 345kV

#1 and #2 San Juan 345kV 855.7 Four Corners – Cholla 345kV

#1 and #2 Four Corners 345kV 858.6 Four Corners – Cholla 345kV

#1 and #2 Pinnacle Peak 230kV 1999.6 Cholla – Saguaro 500kV and

Coronado – Silverking 500kV


Synchronous condenser reactive power output at the nose of the Q-V curve results from the non-simultaneous reactive VAR margin studies are shown in Tables C-2 through C-5. Results for all the reactive VAR margin studies show positive VAR margin at the nose. Figure C-1 illustrates that negative synchronous condenser reactive power output exhibits positive margin for the Q-V curve study.

Figure C-1 (taken directly from Guide to WECC/NERC Rating Standards I.D.: Voltage Support and Reactive Power)


Table C-2: 1000 MW Path 23 Eastbound Synch. Cond. Output VAR Margin Study Results

Contingency

1000 MW Eastbound 102.5% Synch. Cond. Output 1000 MW Eastbound 105% Synch. Cond. Output

Cholla 230kV Rio Puerco 115kV Hogback 115kV Cholla 230kV Rio Puerco 115kV Hogback 115kV Four Corners - Moenkopi 500kV -468.4 -490.4 -343.1 -467.9 -489.6 -342.6

Four Corners - Pinto 345kV -471.9 -493.8 -348.4 -471.8 -492.8 -347.8 Morgan - Pinnacle Peak 500kV -459.1 -485 -342.7 -458.9 -483.7 -342.1

Cholla - Saguaro 500kV -462.6 -486.7 -343.3 -462.4 -485.6 -342.7 Cholla - Sugarloaf 500kV -461.2 -492.3 -344.3 -461.0 -491.1 -343.7

Coronado - Silverking 500kV -462.7 -487.9 -343.5 -462.7 -486.8 -342.9 Four Corners 500/345kV 1AA -456.2 -491.2 -340.6 -454.6 -489 -339.3

Four Corners Unit #5 -470.1 -493 -344.1 -469.6 -487.2 -343.3 Four Corners Unit #4 -470.5 -491.6 -345.7 -470.4 -490.6 -345.2

Four Corners 345/230kV -469.8 -489.1 -344.1 -469.6 -488 -343.5 Cholla Unit #4 -471.5 -489.4 -344.9 -471.4 -488.3 -344.3

Moenkopi - Eldorado 500kV -469.2 -488.5 -344 -469.1 -487.4 -343.3 Coronado Unit #1 -467.9 -484.1 -343.5 -467.7 -481.3 -342.9

Springerville Unit #4 -468.1 -479.9 -343.1 -467.9 -478.7 -342.4 McKinley - Springerville 345kV -469.4 -485.7 -341.8 -469.2 -484.5 -341.1 Springerville - Coronado 500kV -468.7 -490 -344.2 -468.5 -488.7 -343.6

San Juan - McKinley 345kV -469.5 -486.7 -342.2 -469.3 -485.5 -341.5 Coronado - Silverking 500kV -462.7 -487.9 -343.5 -462.7 -486.8 -342.9

Four Corners - Rio Puerco 345kV -464 -164.3 -324 -463.7 -163.1 -322.8 Pinnacle Peak West Bus 230kV -467.1 -488.4 -343.9 -466.9 -487.3 -343.2

Pinnacle Peak Center Bus 230kV -470.3 -489.3 -344.3 -470.1 -488.1 -343.6 Pinnacle Peak East Bus 230kV -462.3 -486.3 -343.3 -462.1 -485.1 -342.6

Hassayampa - North Gila 500kV -468.4 -487.9 -344 -468.2 -486.7 -343.3 Cholla West Bus 345kV -162.3 -477.4 -339.4 -162.2 -474.4 -338.7 Cholla East Bus 345kV -436.3 -474.7 -338.9 -436.2 -473.4 -338.1

Preacher Canyon - Pinnacle Peak 345kV + Transformers (#4 & #14 345/230kV) -469.5 -489.9 -344.6 -469.3 -488.8 -344


Contingency


Cholla 230kV Rio Puerco 115kV Hogback 115kV Cholla 230kV Rio Puerco 115kV Hogback 115kV Mazatzal - Pinnacle Peak 345kV + Transformers (#7 & #14

345/230kV) -473.3 -489.1 -344.9 -473.2 -489.1 -344.3 Cholla - Saguaro 500kV + Coronado Silverking 500kV -453.7 -484.6 -342.3 -453.9 -483.5 -341.7

Four Corners - Moenkopi 500kV + FC Unit #5 -462.2 -487.7 -340.5 -460.9 -485.8 -339.3 Four Corners - Moenkopi 500kV + MK-Cedar Mt. 500kV -464.6 -488.4 -342.8 -464.1 -487.6 -342.2

Four Corners - Moenkopi 500kV + FC 500/345kV -462.3 -487.9 -340.5 -460.9 -485.9 -339.4 Cholla - Sugarloaf 500kV + Cholla 500/345kV #1 -452.8 -491.2 -344 -452.6 -490.1 -343.4

Morgan - Pinnacle Peak 500kV + Raceway-Pinnacle Peak 230kV -457 -484.3 -342.5 -456.7 -481.4 -341.8 Palo Verde - Colorado River 500kV -470 -489.2 -344.3 -469.8 -488.1 -343.7

Cholla-Preacher Canyon 345kV + Cholla - Mazatzal 345kV -460.4 -487.8 -343.8 -460.2 -486.7 -343.2 Four Corners - Cholla 345kV 1 and 2 -434 -459.9 -333.9 -433.8 -456.8 -333

Pinnacle Peak - Mazatzal 345kV -471.7 -490 -344.7 -471.5 -488.9 -344.1 Cholla - Preacher Canyon 345kV -464.2 -488.3 -343.8 -464 -487.2 -343.2

Cholla - Mazatzal 345kV -465.2 -488.5 -344 -465.1 -487.4 -343.3 Four Corners - Cholla 345kV #2 -453.8 -475 -339.1 -453.7 -473.7 -338.3 Four Corners - Shiprock 230kV -469 -487.6 -343.5 -468.8 -486.5 -342.8 Four Corners - San Juan 345kV -469 -487.6 -343.7 -468.8 -486.5 -343


Table C-3: 1420 MW Path 23 Eastbound Synch. Cond. Output VAR Margin Study Results

Contingency



Four Corners - Pinto 345kV -466.2 -495.4 -348.4 -465.6 -495.1 -348.2 Morgan - Pinnacle Peak 500kV -453.1 -486.5 -343 -452.4 -486.1 -342.9


Coronado - Silverking 500kV -459.1 -490.8 -344 -458.6 -490.5 -343.9 Four Corners 500/345kV 1AA -461.2 -488.7 -342.9 -460.4 -488.3 -342.6

Four Corners Unit #5 -458.8 -485.6 -341.8 -457.5 -484.3 -341.2 Four Corners Unit #4 -463.7 -493.1 -345.8 -463.1 -492.9 -345.7

Four Corners 345/230kV -462.8 -490.7 -344.2 -462.1 -490.4 -344.1 Cholla Unit #4 -465.8 -491.2 -345.2 -465.1 -490.9 -345

Moenkopi - Eldorado 500kV -462.3 -490.4 -344.1 -461.6 -490.2 -344 Coronado Unit #1 -460.3 -486.9 -344.2 -459.5 -489.6 -344.1

Springerville Unit #4 -459 -481.2 -343.1 -458.2 -480.8 -342.9 McKinley - Springerville 345kV -462.4 -488.8 -342.4 -461.7 -488.6 -342.2 Springerville - Coronado 500kV -460.3 -488.7 -343.9 -459.5 -488.2 -343.7

San Juan - McKinley 345kV -462.6 -489.1 -342.9 -461.9 -488.8 -342.8 Coronado - Silverking 500kV -459.1 -490.8 -344 -458.6 -490.5 -343.9

Four Corners - Rio Puerco 345kV -456.7 -170.9 -324.1 -456 -170.8 -323.9 Pinnacle Peak West Bus 230kV -460.2 -490 -344 -459.6 -489.7 -343.9

Pinnacle Peak Center Bus 230kV -463.2 -490.8 -344.4 -462.6 -490.5 -344.2 Pinnacle Peak East Bus 230kV -456 -487.8 -343.5 -455.3 -487.5 -343.3

Hassayampa - North Gila 500kV -461.5 -490.5 -344.1 -460.8 -490.2 -344 Cholla West Bus 345kV -157.7 -480.3 -339.7 -157.5 -480.1 -339.5 Cholla East Bus 345kV -429.2 -479.5 -339.3 -428.6 -479.3 -339.1

Preacher Canyon - Pinnacle Peak 345kV + Transformers (#4 & #14 345/230kV) -460.5 -491.3 -344.6 -459.8 -491 -344.4


Contingency



345/230kV) -463.8 -491.5 -344.8 -463.1 -491.2 -344.6 Cholla - Saguaro 500kV + Coronado Silverking 500kV -453.1 -486.7 -343.1 -452.7 -486.5 -343

Four Corners - Moenkopi 500kV + FC Unit #5 -433.8 -487.2 -337.1 -430 -485.3 -335.9 Four Corners - Moenkopi 500kV + MK-Cedar Mt. 500kV -449.4 -497 -343.6 -447.2 -497 -343.4

Four Corners - Moenkopi 500kV + FC 500/345kV -451.4 -495.3 -343 -449.2 -495.3 -342.7 Cholla - Sugarloaf 500kV + Cholla 500/345kV #1 -450.3 -493.2 -344.6 -449.6 -492.9 -344.5

Morgan - Pinnacle Peak 500kV + Raceway-Pinnacle Peak 230kV -451.1 -485.8 -342.8 -450.4 -485.5 -342.6 Palo Verde - Colorado River 500kV -463 -491.4 -344.4 -462.4 -491.1 -344.2

Cholla-Preacher Canyon 345kV + Cholla - Mazatzal 345kV -448.1 -488.9 -343.5 -447.4 -488.7 -343.4 Four Corners - Cholla 345kV 1 and 2 -427 -467.3 -334.7 -426.6 -469.8 -334.4

Pinnacle Peak - Mazatzal 345kV -462.4 -491.2 -344.6 -461.7 -491 -344.5 Cholla - Preacher Canyon 345kV -455.6 -489.8 -343.8 -455 -489.5 -343.7

Cholla - Mazatzal 345kV -456.2 -489.9 -343.9 -455.5 -489.6 -343.7 Four Corners - Cholla 345kV #2 -446.9 -479.8 -339.4 -446.4 -479.5 -339.2 Four Corners - Shiprock 230kV -461.6 -488.7 -343.7 -460.9 -488.2 -343.5 Four Corners - San Juan 345kV -461.5 -488.7 -343.9 -460.8 -488.2 -343.7


Table C-4: 1000 MW Path 23 Westbound Synch. Cond. Output VAR Margin Study Results

Contingency

1000 MW Westbound 102.5% Synch. Cond. Output 1000 MW Westbound 105% Synch. Cond. Output


Four Corners - Pinto 345kV -473.8 -485.2 -362.2 -472.6 -484.8 -361.1 Morgan - Pinnacle Peak 500kV -455.4 -457.1 -355.4 -454.1 -462.8 -354.6


Coronado - Silverking 500kV -424.6 -443.2 -351.8 -422.5 -443 -351 Four Corners 500/345kV 1AA -417.4 -454 -357.3 -414 -454.1 -356.8

Four Corners Unit #5 -460.6 -462.7 -356.8 -459.2 -462.7 -356.1 Four Corners Unit #4 -476.2 -444.2 -355.6 -475.1 -443.8 -354.4

Four Corners 345/230kV -460.8 -457.6 -355.9 -459.4 -457.6 -355.1 Cholla Unit #4 -466.5 -449.2 -355.1 -465.1 -449 -354.2

Moenkopi - Eldorado 500kV -460.2 -464.4 -358.2 -459 -470 -357.4 Coronado Unit #1 -461.9 -443.8 -354.1 -460.6 -449.7 -353.2

Springerville Unit #4 -465.4 -444.7 -354.6 -464.2 -444.4 -353.6 McKinley - Springerville 345kV -459.4 -456.9 -353.9 -458.1 -450.9 -353.1 Springerville - Coronado 500kV -458 -450.5 -354.1 -456.5 -450.4 -353.3

San Juan - McKinley 345kV -459.4 -451.1 -353.6 -458.1 -451 -352.8 Coronado - Silverking 500kV -424.6 -443.2 -351.8 -422.5 -443 -351

Four Corners - Rio Puerco 345kV -458.4 -304.1 -350.9 -457 -298.2 -350.1 Pinnacle Peak West Bus 230kV -459.4 -457.5 -355.8 -458.1 -457.4 -355


Hassayampa - North Gila 500kV -459.4 -457.4 -355.8 -458 -457.3 -355 Cholla West Bus 345kV -177.4 -437.9 -350.8 -177 -443.9 -350 Cholla East Bus 345kV -424.9 -438.2 -350.9 -423.5 -438.1 -350.1

Preacher Canyon - Pinnacle Peak 345kV + Transformers (#4 & #14 345/230kV) -450.9 -456.7 -355.4 -449.5 -456.6 -354.6


Contingency



345/230kV) -457.3 -457.2 -355.8 -455.9 -457.2 -355 Cholla - Saguaro 500kV + Coronado Silverking 500kV -377.7 -417.9 -346 -374.7 -417.7 -345.2

Four Corners - Moenkopi 500kV + FC Unit #5 -417.7 -458.2 -357.5 -414.3 -464 -357 Four Corners - Moenkopi 500kV + MK-Cedar Mt. 500kV -418.8 -459.5 -357 -415.5 -453.7 -356.6

Four Corners - Moenkopi 500kV + FC 500/345kV -417.7 -458.3 -357.5 -414.3 -458.4 -357.1 Cholla - Sugarloaf 500kV + Cholla 500/345kV #1 -445.9 -462.8 -355.5 -444.5 -457 -354.7

Morgan - Pinnacle Peak 500kV + Raceway-Pinnacle Peak 230kV -454.7 -457.1 -355.3 -453.4 -457 -354.5 Palo Verde - Colorado River 500kV -459.6 -453.6 -356.4 -458.3 -453.6 -355.7

Cholla-Preacher Canyon 345kV + Cholla - Mazatzal 345kV -432.3 -450 -353.6 -430.7 -450 -352.8 Four Corners - Cholla 345kV 1 and 2 -448.1 -421.6 -345.6 -447.5 -421.3 -344.7

Pinnacle Peak - Mazatzal 345kV -457.1 -457.3 -355.7 -455.7 -457.3 -355 Cholla - Preacher Canyon 345kV -446.5 -452 -354.9 -445.1 -452 -354.1

Cholla - Mazatzal 345kV -450 -452.4 -355.1 -448.5 -452.3 -354.3 Four Corners - Cholla 345kV #2 -449.2 -443.1 -351.5 -448.1 -443 -350.7 Four Corners - Shiprock 230kV -459.5 -451.9 -356.7 -458.1 -451.8 -356 Four Corners - San Juan 345kV -459.6 -452 -356.4 -458.2 -451.8 -355.6


Table C-5: 1420 MW Path 23 Westbound Synch. Cond. Output VAR Margin Study Results

Contingency



Four Corners - Pinto 345kV -458.9 -483.4 -331.3 -457.2 -487.7 -330.8 Morgan - Pinnacle Peak 500kV -434.3 -438.8 -320.8 -429.9 -434.6 -317.0


Coronado - Silverking 500kV -388.7 -409.7 -311.6 -380.9 -409.9 -306.7 Four Corners 500/345kV 1AA -434.3 -467.3 -321.5 -429.6 -435.3 -317.6

Four Corners Unit #5 -439.3 -459.5 -324 -434.9 -442.3 -320.1 Four Corners Unit #4 -456.7 -412.6 -302.1 -452.1 -393.3 -295.7

Four Corners 345/230kV -439.6 -449.7 -321.7 -435.2 -436.7 -317.9 Cholla Unit #4 -445.3 -426.6 -316.1 -440.9 -422.2 -312.1

Moenkopi - Eldorado 500kV -438.9 -455.9 -328 -434.6 -452.3 -324.2 Coronado Unit #1 -440.8 -434.2 -314.9 -436.6 -419.1 -311

Springerville Unit #4 -443.3 -433.1 -318.5 -439.2 -429.2 -314.7 McKinley - Springerville 345kV -437.3 -434.3 -317 -432.9 -424.3 -313 Springerville - Coronado 500kV -433.8 -430.8 -316.4 -428.7 -415.8 -311.3

San Juan - McKinley 345kV -437.1 -436.1 -315.8 -432.7 -422.4 -311.7 Coronado - Silverking 500kV -388.7 -409.7 -311.6 -380.9 -409.9 -306.7

Four Corners - Rio Puerco 345kV -435.9 -313.4 -312.3 -431.4 -304.2 -308.3 Pinnacle Peak West Bus 230kV -438.2 -439.6 -321.5 -433.8 -436 -317.6


Hassayampa - North Gila 500kV -438.1 -439.6 -321.6 -433.7 -445.3 -317.7 Cholla West Bus 345kV -170.1 -419.6 -310.5 -168.8 -403 -306.2 Cholla East Bus 345kV -402 -417.8 -310.9 -397.6 -405.3 -306.7

Preacher Canyon - Pinnacle Peak 345kV + Transformers (#4 & #14 345/230kV) -427.1 -437.6 -320.8 -422.2 -441.5 -316.9


Contingency



345/230kV) -434.4 -446.1 -321.5 -429.6 -434.9 -317.6 Cholla - Saguaro 500kV + Coronado Silverking 500kV -319.8 -375.6 -295.9 -305.3 -359 -289.6

Four Corners - Moenkopi 500kV + FC Unit #5 -356.4 -461 -329.9 -345.5 -457.3 -326.4 Four Corners - Moenkopi 500kV + MK-Cedar Mt. 500kV -361 -460 -329.8 -350.6 -457 -326.5

Four Corners - Moenkopi 500kV + FC 500/345kV -359.4 -455.7 -328.3 -348.7 -462.1 -324.9 Cholla - Sugarloaf 500kV + Cholla 500/345kV #1 -422.2 -453.6 -320.4 -417.4 -431.8 -316.4

Morgan - Pinnacle Peak 500kV + Raceway-Pinnacle Peak 230kV -433.6 -438.6 -320.7 -429.3 -434.3 -316.9 Palo Verde - Colorado River 500kV -437.7 -442.7 -323.7 -433.2 -438.2 -319.8

Cholla-Preacher Canyon 345kV + Cholla - Mazatzal 345kV -405.7 -435.9 -317.2 -400.2 -422.1 -313.1 Four Corners - Cholla 345kV 1 and 2 -435.4 -387.2 -297.7 -432.9 -365.1 -293

Pinnacle Peak - Mazatzal 345kV -434.5 -439.2 -321.5 -429.8 -436.2 -317.6 Cholla - Preacher Canyon 345kV -422.9 -435.1 -319.8 -418.1 -436.4 -315.9

Cholla - Mazatzal 345kV -426.9 -455.8 -320.2 -422.1 -431.5 -316.3 Four Corners - Cholla 345kV #2 -429.5 -415.1 -312.3 -425.7 -409.7 -308.2 Four Corners - Shiprock 230kV -438.3 -444.5 -324.9 -434.1 -439.7 -321.5 Four Corners - San Juan 345kV -438.4 -443.1 -323.8 -434.2 -438.7 -320.3

Appendix D - Path 23 Transformer Addition – Non-Simultaneous Study – Stability Plots 1

Appendix D

WECC Path 23

Stability Plots

(Not included due to data size – Available upon request by authorized stakeholder)

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