Winchester Substation Interconnection Impact Study · Winchester Substation Interconnection Impact...

Winchester Substation

Interconnection Impact Study

Interconnection of Winchester Substation with the

Greenlee – Vail 345 kV Transmission Line

Requested by Southwest Transmission Cooperative, Inc.

November 2002

TABLE OF CONTENTS EXECUTIVE SUMMARY ............................................................................................................ 3

Interconnection Impact ............................................................................................................... 3 Without CFE Interconnection ................................................................................................. 3 With CFE Interconnection ...................................................................................................... 4

1. INTRODUCTION .................................................................................................................. 6 2. ASSUMPTIONS..................................................................................................................... 6 3. STUDY METHODOLOGY ................................................................................................... 6

3.1 Power Flow Studies ............................................................................................................ 6 4. RESULTS ............................................................................................................................... 7

4.1 POWER FLOW .................................................................................................................. 7 4.1.1 All Lines in Service .................................................................................................... 7

4.1.1.1 Without CFE Interconnection ................................................................................. 7 4.1.1.2 With CFE Interconnection .................................................................................... 15

4.1.2 Single Contingencies ................................................................................................ 23 4.1.2.1 Without CFE Interconnection ............................................................................... 23 4.1.2.2 With CFE Interconnection .................................................................................... 23

4.1.3 Double Contingencies............................................................................................... 24 4.1.3.1 Without CFE Interconnection ............................................................................... 24 4.1.3.2 With CFE Interconnection .................................................................................... 25

4.2 Minimum Generation Requirements................................................................................. 29 4.2.1 Without CFE Interconnection ................................................................................... 30 4.2.2 With CFE Interconnection ........................................................................................ 32

5. CONCLUSIONS................................................................................................................... 32 5.1 Without CFE Interconnection ........................................................................................... 33 5.2 With CFE Interconnection ................................................................................................ 33

Appendix A................................................................................................................................... 34 Contingency Lists ..................................................................................................................... 34

Single Contingencies ............................................................................................................ 34 Double Contingencies........................................................................................................... 35

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EXECUTIVE SUMMARY Southwest Transmission Cooperative, Inc. (“SWTC”) has requested interconnection to Tucson Electric Power Company (TEP) through construction of the new Winchester Substation. This substation will cut into TEP’s Greenlee – Vail 345 kV transmission line approximately 40 miles from the Vail Substation. Initially, Winchester Substation will have 345 kV transmission lines to the Greenlee and Vail Substations and a 230 kV transmission line to SWTC’s Apache Station. Two 345/230 kV transformers will link the 345 kV and 230 kV buses in the substation. This report presents the results of a study, performed by TEP, to determine the impact of the interconnection. The following three scenarios were studied to determine the impact of the interconnection on TEP’s system. 1) Prior to construction of the Winchester Substation. 2) After construction of the Winchester Substation. 3) After construction of the Winchester Substation with 40 MW of additional generation

installed at Apache Generating Station. Each of these scenarios was studied with and without the connection to CFE. In addition to the above scenario studies, an analysis to determine TEP’s minimum generation requirements was also conducted. Interconnection Impact Without CFE Interconnection Normal Conditions With the Winchester interconnection and the increased capacity of the Apache Generating Station, TEP can continue to meet NERC and WSCC power flow reliability criteria under normal conditions. Single Contingencies For TEP single contingencies, no additional lines or transformers become loaded above the emergency rating and bus voltages are within criteria. Flows on lines with existing overloads are not changed with the Winchester interconnection and the additional capacity of the Apache Generating Station. TEP can continue to meet NERC and WSCC power flow reliability criteria for single contingencies. Double Contingencies An increase in remedial action requirements is required to meet NERC and WSCC criteria for TEP Level C double contingencies with the Winchester interconnection and the additional Apache generation capacity. Prior to the project, the only double outage that required load shed or generator tripping was the loss of both the Greenlee-Vail and Springerville-Vail 345-kV lines. This outage required tripping one Apache Generating Station steam unit or shedding 350 MW of TEP load to keep the flow on the Bicknell 345/230 kV transformer below its emergency rating. With the Winchester interconnection, the only Level C double outage that required load shed or generator tripping was the loss of the Winchester-Vail and Springerville-Vail 345-kV lines. This outage requires tripping both Apache Generating Station steam units or shedding 420 MW of TEP load to prevent overloading the Bicknell 345/230 kV transformer. Loss of the Springerville-

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Vail and Greenlee-Winchester 345 kV lines does not cause any overloads, and therefore, does not require any load shed or generator tripping. The additional 40 MW of generation at Apache did not create any new overloads for Level C double outages but increased the load shed requirements for the Winchester-Vail and Springerville-Vail double outage. TEP’s load shed requirements increased to 490 MW to prevent overloading the Bicknell transformer due to this outage. In each of these cases, TEP local generation is at its maximum and TEP load is approximately 1850 MW. Any decrease in local generation will increase the load shed requirements for the worst case double outages that have been identified. It may also lead to overloads due to other double outages, which can be alleviated with less load shed than the worst case scenario. Minimum Local Generation The Winchester interconnection and the increase in Apache generation both affect TEP’s minimum local generation. Local generation is dependent on series compensation in the Springerville-Vail corridor, Irvington generating units that are on-line, and TEP’s load. In addition, load shed for double contingencies will also vary with the local generation. For this analysis, TEP load and the Irvington units on-line were held constant and the local generation and load shed were determined for various levels of series compensation. With the Winchester interconnection, TEP’s local generation requirements increase by a maximum of 50 MW. In addition, load shed requirements increase by a maximum of 150 MW. The maximum increase in generation requirements occurred with all series compensation in service. The maximum increase in load shed occurred with the Springerville-Vail line fully compensated, the Springerville-Greenlee series compensation bypassed, and the existing series compensation at Vail relocated to Winchester. With the Winchester interconnection and the additional generation at Apache, TEP’s local generation requirements increase by a maximum of 130 MW. The load shed requirements increase by a maximum of 120 MW. The maximum increase in generation requirements occurred with all series compensation in service. The maximum increase in load shed occurred in all cases except where all series compensation and no series compensation were in service. With CFE Interconnection Normal Conditions With the Winchester interconnection and the increased capacity of the Apache Generating Station, no additional lines or transformers become overloaded and voltages are in an acceptable range. TEP can continue to meet NERC and WSCC reliability criteria under normal conditions. Single Contingencies Prior to the Winchester interconnection and increasing the output of the Apache Generating Station, the loss of the Greenlee-Vail 345-kV line causes the Bicknell transformer to become loaded at 101% of its rating. With the Winchester Substation interconnection, this overload remains at 101% for the loss of the Winchester-Vail 345-kV line. With the increased output of

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the Apache Generating Station, the Winchester-Vail 345-kV line outage results in an overload of 106% on the Bicknell transformer. Double Contingencies An increase in remedial action requirements is required to meet NERC and WSCC criteria for TEP double contingencies with the Winchester Substation and the additional Apache generation capacity. Prior to the project, ten Level C double outages result in lines and transformers loaded above their emergency ratings. Of these, overloads caused by three double outages could not be alleviated with TEP load shed or tripping the Apache generators. These three double outages are: 1) Vail-South and Westwing-South, 2) Vail-South and South 345/138 kV transformer T2, and 3) South-Gateway #1 and #2. With the Winchester interconnection, twelve Level C double outages result in line or transformer overloads. The same three double outages that could not be alleviated prior to the interconnection, could still not be alleviated with load shed or generator tripping. With the Winchester interconnection and the increased output from the Apache Generating Station, ten Level C double outages result in line or transformer overloads. The same three double outages that could not be alleviated prior to interconnection could still not be alleviated with load shedding or generator tripping. In each of these cases, separation from CFE was necessary to meet criteria. Minimum Local Generation Studies to determine the minimum local generation requirements were not conducted with the CFE interconnection. Local generation requirements are determined by the minimum local generation that has no criteria violations. Due to criteria violations for single and double contingencies with maximum local generation, minimum local generation requirements could not be determined.

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1. INTRODUCTION Southwest Transmission Cooperative, Inc. (“SWTC”) has requested interconnection to Tucson Electric Power Company (“TEP”) through construction of the new Winchester Substation. The Winchester Substation will cut into TEP’s Greenlee – Vail 345 kV transmission line approximately 40 miles from the Vail Substation. Initially, Winchester Substation will have 345 kV transmission lines to the Greenlee and Vail Substations and a 230 kV transmission line to SWTC’s Apache Station. Two 345/230 kV transformers will link the 345 kV and 230 kV portions of the substation. This report presents the results of a study, performed by TEP, to determine the impact of the interconnection. 2. ASSUMPTIONS Studies were required to determine the impact during heavy summer conditions. The study was conducted using the case developed by the Central Arizona Transmission Study (CATS) group. WSCC reliability criteria were applied to determine the impact of the interconnection. 3. STUDY METHODOLOGY A pre-project heavy summer base case was developed to benchmark the existing system. This case was developed from the CATS case that included the Winchester Substation and an additional 40 MW of generation capacity at Apache Generating Station. The pre-project case was developed with the following modifications to the CATS case:

• Reduce Apache Generation by 40 MW • Remove Winchester 345/230 kV transformers from service • Remove Apache – Winchester 230 kV line from service

In addition, for the cases without the CFE interconnection, the status of the motor load equivalent of CFE was set to zero and Palo Verde area merchant generation was reduced to account for the decrease in load. The all lines in service, single contingency, and double contingency analyses were conducted on the CATS case. In this case, TEP local generation was at its maximum. Additional cases were developed to determine the minimum local generation requirements for TEP without the Winchester interconnection, with the Winchester Substation, and with the increased capacity of the Apache Generating Station. 3.1 Power Flow Studies Power flow studies were conducted to determine the impact of the Winchester interconnection to TEP’s system. Studies were conducted with and without a 500 MW transfer to CFE at the Gateway substation. For each of these scenarios, the following scenarios were evaluated: 1) a pre-Winchester case was created to benchmark the existing system, 2) a post-Winchester case was created to determine the impact of the Winchester interconnection, and 3) a post-Winchester with additional Apache generation was created to determine the impact of the Winchester interconnection with an additional 40 MW of generation at AEPCO’s Apache Generating Station. For each of these cases, the system was evaluated with all lines in service, under N-1 conditions, and under N-2 conditions to determine if planning criteria can be met. The single and double contingencies that were evaluated are listed in Appendix A.

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4. RESULTS 4.1 POWER FLOW 4.1.1 All Lines in Service 4.1.1.1 Without CFE Interconnection Analysis of the heavy summer pre-Winchester case revealed that 26 lines and transformers were initially loaded at or above their continuous rating with all lines in service. Of these, only 3 were located in the Desert Southwest Area. These elements are load serving transformers where the load is greater than the rating of the transformer. In addition, emergency ratings were not provided for these transformers. With the Winchester interconnection, the same 26 lines and transformers were overloaded and the percentages remained consistent. With the Winchester interconnection and the additional generation at Apache, the same 26 lines and transformers were overloaded and the percentages remained consistent. Table 1 summarizes the overloads found prior to the Winchester interconnection and the change in loading due to the interconnection and the increased generation at Apache. Figure 1 shows the power flows on TEP’s EHV system prior to the Winchester interconnection. Figure 2 shows the power flows on TEP’s EHV system following the Winchester interconnection. Figure 3 shows the changes in power flow on TEP’s EHV system due to the Winchester interconnection. From these diagrams, it can be seen that the flow on the Springerville-Vail line is reduced by approximately 15 MW. This indicates there may be an impact on TEP’s ability to meet Two-County requirements. Figure 4 shows the power flow on TEP’s EHV system with the Winchester interconnection and the additional output of the Apache Generating Station. Figure 5 shows the changes in power flow, relative to the pre-Winchester case, due to the Winchester interconnection and the additional output at the Apache Generating Station. From these diagrams, it can be seen that the flow on the Springerville-Vail line is decreased by approximately 20 MW from the pre-Winchester case. This indicates that TEP’s ability to meet Two-County requirements may be impacted due to the Winchester interconnection and the increased output from the Apache Generating Station.

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9

Table 1. Overloads with All Lines in Service and No CFE Interconnection.

Pre-Winchester

Post-Winchester

Change Post-Winchester

With Apache Generation

Change

From

From Name

To

To Name

Ck

Rate

Flow

Pct

Flow

Pct

Flow

Pct

Flow

Pct

Flow

Pct

12002 ALAMOGPG 12003 ALAMOGPG 1 5.00 MVA 6.38 127.62 6.38 127.61 0.0 -0.01 6.38 127.62 0.0 012087 WILLARD 12088 WILLARD 1 9.40 MVA 11.19 119.01 11.19 119.01 0.0 0.0 11.19 119.02 0.0 0.0119019 BLK MESA 14401 BLK MESA 1 128.00 MVA 136.20 106.41 136.20 106.41 0.0 0.0 136.20 106.41 0.0 0 20008 ROS-P1A 20001 PJZ-230 1 80.00 MVA 80.15 100.18 80.15 100.18 0.0 0.0 80.15 100.19 0.0 0.0120009 ROS-P2A 20001 PJZ-230 1 80.00 MVA 80.15 100.18 80.15 100.18 0.0 0.0 80.15 100.19 0.0 0.0137549 FOLSOM1 37547 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.0 0.0 67.68 102.54 0.0 0.037550 FOLSOM2 37548 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.0 0.0 67.68 102.54 0.0 0.037551 FOLSOM3 37548 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.0 0.0 67.68 102.54 0.0 0.047009

0BELL SO 40088 BELL MI 1 1255.11 A 1310.50 104.41 1310.51 104.41 0.01 0.0 1310.92 104.45 0.42 0.04

40135 BONNVIL1 40139 BONNVILE 1 48.00 MVA 50.08 104.34 50.08 104.34 0.0 0.0 50.08 104.34 0.0 0.040135 BONNVIL1 40139 BONNVILE 2 48.00 MVA 50.08 104.34 50.08 104.34 0.0 0.0 50.08 104.34 0.0 0.042165 BURROWS 42118 FIDALGO 1 230.94 A 258.63 111.99 258.63 111.99 0.0 0.0 258.63 111.99 0.0 0.046671 ALDER11 46670 ALDER 1 25.00 MVA 25.04 100.92 25.04 100.92 0.0 0.0 25.04 100.92 0.0 0.046672 ALDER12 46670 ALDER 1 25.00 MVA 25.04 100.92 25.04 100.92 0.0 0.0 25.04 100.92 0.0 0.046733 LAGRND5 46735 LGBK5 1 40.00 MVA 41.05 102.63 41.05 102.63 0.0 0.0 41.05 102.63 0.0 0.048163 I.E.PAPR 48161 I.E.PAPR 1 28.00 MVA 29.09 103.88 29.09 103.88 0.0 0.0 29.09 103.88 0.0 0.050175 ALU G1 50226 ALU 60 1 9.00 MVA 10.30 114.40 10.30 114.40 0.0 0.0 10.30 114.40 0.0 0.0 50575 PLT 66 50630 PLT 25 1 6.00 MVA 6.75 112.57 6.75 112.57 0.0 0.0 6.75 112.57 0.0 0.0 50775 ELK G1-2 50817 ELK 66 1 12.00 MVA 12.01 100.09 12.01 100.09 0.0 0.0 12.01 100.09 0.0 0.0 54051 DOW GEN2 54754 DOW BUS2 1 50.00 MV A 51.22 106.90 51.22 106.90 0.0 0.0 51.22 106.90 0.0 0.0 54343 DOW GEN1 54762 DOW BUS1 1 50.00 MVA 52.39 109.96 52.39 109.96 0.0 0.0 52.39 109.96 0.0 0.0 60116 SHSNFALS 60115 CLIFF 1 12.00 MVA 12.08 100.70 12.08 100.70 0.0 0.0 12.08 100.70 0.0 0.060361 U SAMN 1 60360 U SALMON 1 9.00 MVA 9.52 105.75 9.52 105.75 0.0 0.0 9.52 105.75 0.0 0.0 60362 U SAMN 2 60360 U SALMON 1 9.00 MVA 9.52 105.75 9.52 105.75 0.0 0.0 9.52 105.75 0.0 0.0 60363 U SAMN 3 60360 U SALMON 1 9.00 MVA 9.10 101.12 9.10 101.12 0.0 0.0 9.10 101.12 0.0 0.0 60364 U SAMN 4 60360 U SALMON 1 9.00 MVA 9.10 101.12 9.10 101.12 0.0 0.0 9.10 101.12 0.0 0.0

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Figure 1. Power Flow Prior to the Winchester Interconnection

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Figure 2. Power Flow with the Winchester Interconnection

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Figure 3. Changes in Power Flow due to Winchester Interconnection

13

Figure 4. Power Flow with the Winchester Substation Interconnection and Additional Apache Generation

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Figure 5. Changes in Power Flow due to the Winchester Substation Interconnection and Additional Apache Generation

4.1.1.2 With CFE Interconnection Analysis of the heavy summer pre-project case revealed that 26 lines and transformers were initially loaded at or above their continuous rating with all lines in service. Of these, only 3 were located in the Desert Southwest Area. These are the same load serving transformers as discussed in section 4.1.1.1. With the addition of Winchester to the system, the same 26 lines and transformers were overloaded and the percentages remained consistent. Table 2 summarizes the overloads found prior to the Winchester interconnection and the change in loading due to the interconnection and the increased generation at Apache. Figure 6 shows the power flows on TEP’s EHV system prior to the Winchester interconnection. Figure 7 shows the power flows on TEP’s EHV system following the Winchester interconnection. Figure 8 shows the changes in power flow on TEP’s EHV system due to the Winchester interconnection. From these diagrams, it can be seen that the flow on the Springerville-Vail line is reduced by approximately 20 MW. This indicates there may be an impact on TEP’s ability to meet Two-County requirements. Figure 9 shows the power flow on TEP’s EHV system with the Winchester interconnection and the additional output of the Apache Generating Station. Figure 10 shows the changes in power flow, relative to the pre-Winchester case, due to the Winchester interconnection and the additional output at the Apache Generating Station. From these diagrams, it can be seen that the flow on the Springerville-Vail line is decreased by approximately 25 MW from the pre-Winchester case. This indicates that TEP’s ability to meet Two-County requirements may be impacted due to the Winchester interconnection and the increased output from the Apache Generating Station.

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Table 2. Overloads with All Lines in Service and CFE Interconnection.

Pre-Winchester

Post-Winchester

Change Post-Winchester

With Apache Generation

Change

From

From Name

To

To Name

Ck

Rate

Flow

Pct

Flow

Pct

Flow

Pct

Flow

Pct

Flow

Pct

12002 ALAMOGPG 12003 ALAMOGPG 1 5.00 MVA 6.38 127.62 6.38 127.62 0.00 0.00 6.38 127.62 0.00 0.0012087 WILLARD 12088 WILLARD 1 9.40 MVA 11.19 119.02 11.19 119.02 0.00 0.00 11.19 119.02 0.00 0.0019019 BLK MESA 14401 BLK MESA 1 128.00 MVA 136.20 106.41 136.20 106.41 0.00 0.00 136.20 106.41 0.00 0.00 20008 ROS-P1A 20001 PJZ-230 1 80.00 MVA 80.15 100.19 80.15 100.19 0.00 0.00 80.15 100.19 0.00 0.0020009 ROS-P2A 20001 PJZ-230 1 80.00 MVA 80.15 100.19 80.15 100.19 0.00 0.00 80.15 100.19 0.00 0.0037549 FOLSOM1 37547 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.00 0.00 67.68 102.54 0.00 0.0037550 FOLSOM2 37548 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.00 0.00 67.68 102.54 0.00 0.0037551 FOLSOM3 37548 FOLSOM 1 66.00 MVA 67.68 102.54 67.68 102.54 0.00 0.00 67.68 102.54 0.00 0.0040090 BELL SO 40088 BELL MI 1 1255.11 A 1307.46 104.17 1307.47 104.17 0.01 0.00 1307.70 104.19 0.24 0.02 40135 BONNVIL1 40139 BONNVILE 1 48.00 MVA 50.08 104.34 50.08 104.34 0.00 0.00 50.08 104.34 0.00 0.0040135 BONNVIL1 40139 BONNVILE 2 48.00 MVA 50.08 104.34 50.08 104.34 0.00 0.00 50.08 104.34 0.00 0.0042165 BURROWS 42118 FIDALGO 1 230.94 A 258.63 111.99 258.63 111.99 0.00 0.00 258.63 111.99 0.00 0.0046671 ALDER11 46670 ALDER 1 25.00 MVA 25.04 100.92 25.04 100.92 0.00 0.00 25.04 100.92 0.00 0.0046672 ALDER12 46670 ALDER 1 25.00 MVA 25.04 100.92 25.04 100.92 0.00 0.00 25.04 100.92 0.00 0.0046733 LAGRND5 46735 LGBK5 1 40.00 MVA 41.05 102.63 41.05 102.63 0.00 0.00 41.05 102.63 0.00 0.0048163 I.E.PAPR 48161 I.E.PAPR 1 28.00 MVA 29.09 103.88 29.09 103.88 0.00 0.00 29.09 103.88 0.00 0.0050175 ALU G1 50226 ALU 60 1 9.00 MVA 10.30 114.40 10.30 114.40 0.00 0.00 10.30 114.40 0.00 0.00 50575 PLT 66 50630 PLT 25 1 6.00 MVA 6.75 112.57 6.75 112.57 0.00 0.00 6.75 112.57 0.00 0.0050775 ELK G1-2 50817 ELK 66 1 12.00 MVA 12.01 100.09 12.01 100.09 0.00 0.00 12.01 100.09 0.00 0.00 54051 DOW GEN2 54754 DOW BUS2 1 50.00 MVA 51.22 106.90 51.22 106.90 0.00 0.00 51.22 106.90 0.00 0.00 54343 DOW GEN1 54762 DOW BUS1 1 50.00 MVA 52.39 109.96 52.39 109.96 0.00 0.00 52.39 109.96 0.00 0.00 60116 SHSNFALS 60115 CLIFF 1 12.00 MVA 12.08 100.70 12.08 100.70 0.00 0.00 12.08 100.70 0.00 0.0060361 U SAMN 1 60360 U SALMON 1 9.00 MVA 9.52 105.75 9.52 105.75 0.00 0.00 9.52 105.75 0.00 0.00 60362 U SAMN 2 60360 U SALMON 1 9.00 MVA 9.52 105.75 9.52 105.75 0.00 0.00 9.52 105.75 0.00 0.00 60363 U SAMN 3 60360 U SALMON 1 9.00 MVA 9.10 101.13 9.10 101.13 0.00 0.00 9.10 101.13 0.00 0.00 60364 U SAMN 4 60360 U SALMON 1 9.00 MVA 9.10 101.13 9.10 101.13 0.00 0.00 9.10 101.13 0.00 0.00

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Figure 6. Power Flow with the CFE Interconnection Prior to the Winchester Interconnection.

19

Figure 7. Power Flow with the CFE Interconnection and the Winchester Interconnection.

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Figure 8. Changes in Power Flow with the CFE Interconnection due to Winchester Interconnection.

21

Figure 9. Power Flow with the CFE Interconnection, Winchester Interconnection, and Increased Apache Generation.

22

Figure 10. Changes in Power Flow with the CFE Interconnection due to Winchester Interconnection and Increased Apache Generation.

4.1.2 Single Contingencies 4.1.2.1 Without CFE Interconnection Analysis of the heavy summer pre-project case revealed that TEP single contingencies result in 23 or 24 lines and transformers, depending on the outage, loaded at or above their emergency rating. Of these lines and transformers, only two were in the Desert Southwest Area and both were overloaded prior to the contingency. The overloads were the Alamogordo PG 115/24.9 kV transformer and the Willard 115/34.5 kV transformer. Both of these transformers serve load and the load is greater than the transformer rating in the model. Analysis of the system with the Winchester interconnection revealed that TEP single contingencies also result in 23 or 24 overloads, depending on the outage. The overloaded lines and transformers are the same and the change in percentage overload is less than 0.1% on each line or transformer. Analysis of the system with the Winchester interconnection and the additional generation at Apache also revealed that TEP single contingencies result in 23 or 24 overloads, depending on the outage. The overloaded lines and transformers are the same and the change in flow is less than 0.1% on each line and transformer. Table 3 summarizes the overloads during TEP single contingencies in the Desert Southwest Area without the CFE interconnection. Due to rounding, the flow values do not change but the percentages change. In each case, there were no violations of voltage criteria for a single TEP contingency. However, Table 3. Over loads due to TEP Single Contingencies without CFE Interconnection .

Pre-Winchester Post-Winchester Post Winchester with Apache Generation

Outage Overload Pre-

Outage Flow

Post-Outage Flow

Post-Outage

Pct

Pre-Outage Flow

Post-Outage Flow

Post-Outage

Pct

Pre-Outage Flow

Post-Outage Flow

Post-Outage

Pct Any TEP EHV Outage

ALAMOGPG 115/24.9 kV transformer

6.38 MVA

6.38 MVA

127.58 – 127.68%

6.38 MVA

6.38 MVA

127.59 – 127.68%

6.38 MVA

6.38 MVA

127.59 – 127.67%

Any TEP EHV Outage

Willard 115/34.5 kV transformer

11.19 MVA

11.18 – 11.19 MVA

118.98-119.03%

11.19 MVA

11.18-11.19 MVA

118.98-119.03%

11.19 MVA

11.18-11.19 MVA

118.99-119.03%

4.1.2.2 With CFE Interconnection Analysis of the heavy summer pre-project system with the CFE interconnection revealed that TEP single contingencies result in 23 or 24 overloaded lines and transformers, depending on the outage. Of these lines and transformers, only five were in the Desert Southwest Area. The overloads were: 1) Alamogordo PG 115/24.9 kV transformer, 2) Hernandez-Norton2 115 kV line, 3) Willard 115/34.5 kV transformer, 4) Sonoita-Valencia 115 kV line, and 5) Bicknell 345/230 kV transformer. The Alamogordo PG and Willard transformers were overloaded prior to the contingency and remained overloaded during each contingency. Analysis of the system with the Winchester interconnection also revealed that TEP single contingencies result in 23 or 24 overloads, depending on the outage. Of these lines and

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transformers, only four are in the Desert Southwest Area. The line and transformer overloads are the same as prior to the interconnection except the Sonoita-Valencia 115 kV line does not become overloaded for the Vail-South 345 kV line outage and the exposure to overloading the Bicknell 345/230 kV transformer is reduced to only the Winchester-Vail outage. Analysis of the system with the Winchester interconnection and the additional generation at Apache also revealed that TEP single contingencies result in 23 or 24 overloads, depending on the outage. Of these lines and transformers, only four are in the Desert Southwest Area. The line and transformer overloads are the same as prior to the interconnection except the Sonoita-Valencia 115 kV line does not become overloaded for the Vail-South 345 kV line outage. In addition, the exposure to overloading the Bicknell 345/230 kV transformer is reduced from outage of the Greenlee-Vail line to outage of the Winchester-Vail line. This pre-existing overload increases by approximately 5% from the pre-interconnection case. Table 4 summarizes the overloads in the Desert Southwest Area during TEP single contingencies with the CFE interconnection. Table 4. Overloads for TEP Single Contingencies with CFE Interconnection.

Pre-Winchester Post-Winchester Post Winchester with Apache Generation

Outage Overload Pre-

Outage Flow

Post-Outage Flow

Post-Outage

Pct

Pre-Outage Flow

Post-Outage Flow

Post-Outage

Pct

Pre-Outage Flow

Post-Outage Flow

Post-Outage

Pct

Any TEP EHV Lines

ALAMOPG 115/24.9 kV transformer

6.38 MVA

6.38-6.39

MVA

127.57 – 127.74%

6.38 MVA

6.38-6.39

MVA

127.58 – 127.73%

6.38 MVA

6.38-6.39

MVA

127.58 – 127.72%

Any TEP EHV Lines

Willard 115/34.5 kV transformer

11.19 MVA

11.18-11.19 MVA

118.98 – 119.03%

11.19 MVA

11.18-11.19 MVA

118.98 – 119.03%

11.19 MVA

11.18-11.19 MVA

118.98 – 119.03%

Springerville-Greenlee 345 kV line

Hernandez – Norton2 115 kV line

110.66 MVA

116.24 MVA 101.33% 110.66

MVA 116.23 MVA 101.32% 110.63

MVA 116.13 MVA 101.21%

Vail-South 345 kV line

Sonoita-Valencia 115 kV line

23.89 MVA

66.53 MVA 100.08% 23.89

MVA 59.89 MVA 89.58% 23.35

MVA 60.42 MVA 90.91%

Greenlee-Vail 345 kV line

Bicknell 345/230 kV transformer

39.72 MVA

194.84 MVA 100.96% N/A N/A N/A N/A N/A N/A

Winchester-Vail 345 kV line

Bicknell 345/230 kV transformer

N/A N/A N/A 39.72 MVA

194.81 MVA 100.94% 40.62

MVA 203.71 MVA 105.55%

4.1.3 Double Contingencies Level C and D contingencies were evaluated but only Level C results are provided in the report. It is assumed that any double outage involving 2 elements at the South Substation is a Level C outage. The final layout of the South Substation will determine which double outages are Level C and D. 4.1.3.1 Without CFE Interconnection Prior to the Winchester Substation interconnection and increased output of the Apache Generating Station, the only Level C double outage that required load shed or generator tripping was the loss of both the Greenlee-Vail and Springerville-Vail 345 kV lines. This double outage causes the Bicknell 345/230 kV transformer to become loaded to 118.1% of its emergency

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rating. To reduce the flow on the transformer below its emergency rating required tripping one Apache Generating Station steam unit or shedding 370 MW of TEP load. With the Winchester Substation interconnection, the only Level C double outage that required load shed or generator tripping was the loss of both the Winchester-Vail and Springerville-Vail 345 kV lines. This double outage caused the Bicknell 345/230 kV transformer to become loaded at 123.7%. To reduce the flow on the transformer below its emergency rating required tripping both Apache Generating Station steam units or shedding 420 MW of TEP load. With the additional 40 MW of generation at Apache, the Winchester-Vail and Springerville-Vail 345 kV line double outage was still the only Level C outage that required generator tripping or load shed to meet criteria. This double outage caused the Bicknell 345/230 kV transformer to become loaded at 128.4% of its emergency rating. To reduce the flow on the transformer below its emergency rating required tripping both Apache steam units or shedding 490 MW of TEP load. In each of the scenarios above, TEP local generation was not modeled at its minimum value. Decreasing local generation will increase the load shed requirement and may result in more double outages requiring load shed. Minimum local generation requirements will be discussed later in the report. 4.1.3.2 With CFE Interconnection Prior to the Winchester interconnection and increased output of the Apache Generating Station, there were ten Level C double outages that resulted in lines being loaded above their emergency ratings. Of these, seven could be alleviated using TEP load shed, generator tripping at Apache, or a combination of both. The remaining outages required separating from CFE to meet reliability criteria. These three double outages are: 1) Vail-South and Westwing-South 345 kV lines, 2) Vail-South and South 345/138 kV transformer, and 3) South-Gateway #1 and #2. Table 5 lists the outages, problems and remedial actions that will alleviate the problems.

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Table 5. Overloads Due to Level C Double Outages Prior to Winchester Interconnection Outage Overloads Remedial Action *Winchester-Vail Greenlee-Winchester

Bicknell 345/230 kV transformer – 101.0% Level B criteria violation

**Greenlee – Vail Springerville – Vail

Apache – Butterfield 230 kV line – 100.7% Sonoita – Valencia 115 kV line – 122.8% Bicknell 345/230 kV transformer – 158.5%

Trip 1 Apache Steam Unit and Shed 490 MW of TEP load

or Trip 2 Apache Steam Units and Shed 530 MW of TEP load

Greenlee – Vail Vail 345/138 kV T1

Bicknell 345/230 kV transformer – 110.8% Trip 1 Apache Steam Unit or

Shed 410 MW of TEP load Greenlee – Vail Hidalgo – Greenlee


Shed 210 MW of TEP load Saguaro – Tortolita #1 Saguaro – Tortolita #2

Avra –Marana 115 kV line – 102.3% Sonoita – Valencia 115 kV line – 105.8% Bicknell 345/230 kV transformer – 100.1%

Shed 80 MW of TEP load

Springerville-Luna Springerville-Vail

None None

Springerville – Greenlee Springerville – Vail

None None

Vail – South Westwing – South

Drexel – Irvington 138 kV line – 123.0% Irvington – South 138 kV line – 114.7% Sonoita – Valencia 115 kV line – 176.8% Nogales – Kantor 115 kV line – 100.7%

Can not alleviate overload with load shed and generator tripping Separation from CFE

Vail – South South – Gateway #1

Sonoita – Valencia 115 kV line – 114.0% Trip 2 Apache Steam Units or



Sonoita – Valencia 115 kV line – 114.0% Trip 2 Apache Steam Units or


Vail – South South 345/138 kV T2

Sonoita – Valencia 115 kV line – 135.0% Can not alleviate overload with load shed and generator tripping Separate from CFE

South – Gateway #1 South – Gateway #2

Did Not Solve Separate from CFE

Tortolita 500/138 kV T1 Tortolita 500/138 kV T2

Avra - Marana 115 kV line – 102.3% Sonoita - Valencia 115 kV line – 105.8% Bicknell 345/230 kV transformer – 100.1%

Shed 80 MW of TEP load

* Prior to the Winchester interconnection, the Greenlee-Winchester/Winchester-Vail double outage is the same as the Greenlee-Vail single outage. ** Pre-interconnection outages with Greenlee-Vail can be compared to post-interconnection outages with Winchester-Vail or Greenlee-Winchester The interconnection of the Winchester Substation has both positive and negative impacts on load shed and generator tripping requirements. For some outages, generator tripping or load shed was reduced, while others had an increase in generator tripping or load shed. With the Winchester interconnection, three additional Level C double outages resulted in overloads. The Winchester-Vail/Greenlee-Winchester outages was created by the interconnection and resulted in an overload of the Bicknell 345/230 kV transformer that required load shed to be alleviated. This outage was a Level B single contingency that violated criteria prior to the interconnection. As a Level C double outage, load shed can be used to alleviate the overload and meet criteria.

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The other double outages that resulted in new overloads with the Winchester interconnection are the Springerville-Greenlee/Springerville-Vail and Springerville-Luna/Springerville-Vail double outages. The Springerville-Greenlee/Springerville-Vail double outage causes overloads on the Avra-Marana line in Arizona, and the Hernandez-Norton2 and Bluewater-Grants T lines in New Mexico. The Springerville-Luna/Springerville-Vail outage causes overloads on the Springerville-Greenlee line in Arizona and the Hernandez-Norton2 line in Mew Mexico. Prior to the Winchester interconnection, loss of both the Greenlee-Vail and Hidalgo-Greenlee 345 kV lines resulted in an overload of the Bicknell 345/230 kV transformer. With the Winchester interconnection on the Greenlee-Vail line, loss of both the Greenlee-Winchester and Hidalgo-Greenlee lines does not cause any overloads. The double outage of the Winchester-Vail and Hidalgo-Greenlee lines is not a common mode double outage and falls into a more severe category of the WSCC and NERC criteria. As in the pre-interconnection case, the outages that could not be alleviated with load shed or generator tripping required separation from CFE to meet reliability criteria. Also, TEP local generation is not at its minimum requirement, therefore, any change in local generation will change the load shed requirement. Table 6 shows the new load shed or generator tripping requirements to meet criteria for Level C double outages.

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Table 6. Overloads Due to Level C Double Outages Following Winchester Substation Interconnection Outage Overloads Remedial Action Winchester – Vail Greenlee – Winchester


Shed 30 MW of TEP Load Winchester – Vail Springerville – Vail


Trip 2 Apache Steam Units and

Shed 400 MW of TEP Load Winchester – Vail Vail 345/138 kV T1


Shed 400 MW of TEP Load Greenlee-Winchester Hidalgo-Greenlee

None None

Saguaro – Tortolita #1 Saguaro – Tortolita #2

Avra – Marana 115 kV line – 104.7% Shed 70 MW of TEP Load

Springerville – Luna Springerville – Vail

Springerville – Greenlee 345 kV line – 100.8% Hernandez – Norton2 115 kV line – 104.1%

Shed 40 MW of TEP Load


Avra – Marana 115 kV line – 101.0% Hernandez – Norton2 115 kV line – 103.8% Bluewater – Grants T 115 kV line – 100.4%

Shed 30 MW of TEP Load


Drexel – Irvington 138 kV line – 123.9% Irvington – South 138 kV line – 115.8% Sonoita – Valencia 115 kV line – 162.7%

Can not alleviate overload with load shed and/or generator tripping Separate from CFE


Sonoita – Valencia 115 kV line – 103.4% Trip 1 Apache Steam Unit or

Shed 200 MW of TEP Load Vail – South South – Gateway #2


Shed 200 MW of TEP Load Vail – South South 345/138 kV T2

Sonoita – Valencia 115 kV line – 128.1% Cannot alleviate overloads with load shed and/or generator tripping Separate from CFE





The additional 40 MW of generating capacity at the Apache Generating Station also has positive and negative impacts to the system. The overloads are reduced or alleviated for some outages, while overloads increased for other outages. The additional generation did not create any new overloads for Level C double outages. Two double outages that caused new overloads with the Winchester interconnection did not cause any overloads with the additional generation. The two outages that had overloads alleviated are the Springerville-Luna/Springerville-Vail and Springerville-Greenlee/Springerville-Vail double outages. Table 7 shows the load shed and generator tripping requirements with the additional generation and Winchester interconnection.

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Table 7. Overloads Due to Level C Double Outages with Winchester Interconnection and Increased Generation at Apache Outage Overloads Remedial Action Winchester – Vail Greenlee – Winchester


Shed 210 MW of TEP Load Winchester – Vail Springerville – Vail


Trip 2 Apache Steam Units and

Shed 470 MW of TEP Load Winchester – Vail Vail 345/138 kV T1


Shed 560 MW of TEP Load Greenlee-Winchester Hidalgo-Greenlee

None None

Saguaro – Tortolita #1 Saguaro – Tortolita #2


Springerville-Luna Springerville-Vail

None None


None None


Drexel – Irvington 138 kV line – 124.1% Irvington – South 138 kV line – 116.0% Sonoita – Valencia 115 kV line – 163.1%

Can not alleviate overload with load shed and generator tripping Separate from CFE



Shed 270 MW of TEP Load Vail – South South – Gateway #2


Shed 270 MW of TEP Load Vail – South South 345/138 kV T2

Sonoita – Valencia 115 kV line – 130.6% Cannot alleviate overloads with load shed or generator tripping Separate from CFE





4.2 Minimum Generation Requirements Studies were conducted by TEP to determine the minimum local generation requirements to meet planning criteria. Local generation requirements are determined by finding the minimum amount of local generation must be on-line to allow TEP to meet planning criteria. Factors that will influence required local generation are unit commitment, series compensation in the Springerville-Vail corridor, transmission availability, and TEP load. In this study, a system snapshot with all lines and transformers initially in service, all 4 Irvington steam units on-line, and approximately 1850 MW TEP load was analyzed. Results for various levels of series compensation in the Springerville-Vail corridor are reported. Generally, two scenarios are the limiting factor for this analysis. Under N-1 conditions, no line or transformer can be loaded above its emergency rating. Under N-2 conditions, no line or transformer can be loaded above its emergency rating following load shed. For N-2 conditions, the maximum load shed allowed in TEP’s control area is 1/3 of 95% of TEP’s city load.

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4.2.1 Without CFE Interconnection In this case, the limiting outage for determining minimum local generation requirements is the double outage of the Springerville-Vail and Greenlee-Vail 345 kV lines. Under these conditions, prior to the interconnection, only minimum output is required from each Irvington unit. However, load shed changed depending on the series compensation. Table 8 displays the local generation and the associated load shed requirements for the pre-Winchester case. Table 8. Local Generation Requirements Prior to the Winchester Interconnection Series Compensation Irvington Units On-Line Local Generation (MW) Load Shed (MW) SP-GL (39%@GL) GL-VL (28%@VL) SP-VL (18%@GL) SP-VL (20%@VL)

1234 80 500

GL-VL (28%@VL) SP-VL (18%@GL) SP-VL (20%@VL)

1234 80 390

SP-VL (18%@GL) SP-VL (20%@VL)

1234 80 390

None 1234 80 400 With the Winchester interconnection, additional series compensation configurations were analyzed to determine the impacts to local generation requirements with the series compensation where it exists today and with the series compensation fully or partially relocated to the Winchester Substation. The Greenlee-Vail line is currently 28% compensated and the capacitors are located at the Vail Substation. By keeping the series compensation where it exists today, the Winchester Vail line will be 90% compensated. Moving the series capacitors to Winchester and installing it on the Greenlee-Winchester line results in 41% compensation of the line. The three remaining scenarios maintained the 28% compensation on the Greenlee-Winchester and Winchester-Vail lines. In one scenario, both lines were compensated and the other two scenarios had compensation in only one of the lines. The Winchester interconnection causes an increase in local generation requirements or load shed, depending on the series compensation configuration. The maximum increase in generation requirements is with all series compensation in service in its existing location. This scenario also has the lowest increase in load shed to meet criteria. In each of the other scenarios where the total compensation remained the same, the change in local generation requirements changed 10 MW or less and the load shed requirement changed 140-150 MW. Table 9 displays the local generation requirements and associated load shed requirements for the system with the Winchester interconnection.

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Table 9. Local Generation Requirements with the Winchester Interconnection Series Compensation Irvington

Units On-Line

Local Generation (MW)

Change in Local Generation (MW)

Load Shed (MW)

Change in Load Shed (MW)

SP-GL (39%@GL) WN-VL (90%@VL)* SP-VL (18%@GL) SP-VL (20%@VL)

1234 130 50 560 60

WN-VL (90%@VL)* SP-VL (18%@GL) SP-VL (20%@VL)

1234 80 0 530 140

GL-WN (41%@WN)** SP-VL (18%@GL) SP-VL (20%@VL)

1234 80 0 540 150

GL-WN (28%@WN)*** WN-VL (28%@VL)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 90 10 530 140

GL-WN (28%@WN)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 100 N/A 510 N/A

WN-VL (28%@VL)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 90 N/A 520 N/A


1234 90 10 530 140

None 1234 100 20 510 110 * Existing series compensation at Vail is not changed. Percent compensation is increased due to reduction in line length. ** Existing series compensation at Vail is moved to Winchester. Percent compensation is increased due to reduction in line length. *** Existing series compensation is divided proportionally between Winchester and Vail Substations. The Winchester interconnection and additional generation at Apache increases the local generation requirements and associated load shed for the case with all Irvington units on-line and a load of approximately 1850 MW. The greatest increase in local generation requirements was 130 MW with all series compensation in service. This case also had the lowest increase in associated load shed requirements. All other scenarios except the no compensation scenario had an increase of 80-90 MW in required local generation and 120 MW increase in associated load shed. The no compensation case had a 100 MW increase in both required local generation and associated load shed. Table 10 displays the local generation requirements and associated load shed requirements for the system with the Winchester interconnection and the additional capacity of the Apache Generating Station.

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Table 10. Local Generation Requirements with the Winchester Interconnection and Increased Output of the Apache Generating Station Series Compensation Irvington

Units On-Line

Local Generation (MW)

Change in Local Generation (MW)

Load Shed (MW)

Change in Load Shed (MW)

SP-GL (39%@GL) WN-VL (90%@VL)* SP-VL (18%@GL) SP-VL (20%@VL)

1234 210 130 540 40

WN-VL (90%@VL)* SP-VL (18%@GL) SP-VL (20%@VL)

1234 160 80 510 120

GL-WN (41%@WN)** SP-VL (18%@GL) SP-VL (20%@VL)

1234 170 90 510 120

GL-WN (28%@WN)*** WN-VL (28%@VL)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 170 90 510 120

GL-WN (28%@WN)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 170 N/A 510 N/A

WN-VL (28%@VL)*** SP-VL (18%@GL) SP-VL (20%@VL)

1234 170 N/A 510 N/A


1234 160 80 510 120

None 1234 180 100 500 100 * Existing series compensation at Vail is not changed. Percent compensation is increased due to reduction in line length. ** Existing series compensation at Vail is moved to Winchester. Percent compensation is increased due to reduction in line length. *** Existing series compensation is divided proportionally between Winchester and Vail Substations. The Springerville-Greenlee series compensation requires either more local generation or more load shed to meet N-2 criteria. In the pre-Winchester base case, the required minimum local generation was the same as the other series compensation combinations but the load shed requirement was higher. In the post-Winchester cases, the minimum local generation requirements and load shed requirements were the greatest when the Springerville-Greenlee series compensation was in service. In each case, the limiting factor was reducing the flow on the Bicknell 345/230 kV transformer below its emergency rating of 193 MVA. 4.2.2 With CFE Interconnection Studies to determine the minimum local generation requirements were not conducted with the CFE interconnection because the model used for the single and double contingency analysis had local generation at its maximum and reliability criteria violations occurred. Violations occurred for both single and double contingencies. By definition, since criteria violations occurred with maximum local generation, a minimum local generation requirement cannot be calculated. 5. CONCLUSIONS The results of this study indicate that the Winchester Substation and increased output of the Apache Generating Station will have positive and negative impacts to TEP and these impacts are dependent upon the interconnection with CFE.

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5.1 Without CFE Interconnection Without the CFE interconnection, local generation requirements will increase and load shed will increase for the only Level C double outage that requires load shed. However, exposure to this Level C outage will be reduced with the Winchester interconnection. Presently, this contingency is the 128-mile corridor shared by the Greenlee-Vail and Springerville-Vail l345 kV lines. This interconnection reduces the exposure to the 40-mile corridor shared by the Winchester-Vail and Springerville-Vail 345 kV lines. The Winchester interconnection and the additional 40 MW of generation at Apache does not cause any additional overloads for single contingencies or Level C double contingencies. However, it does increase the load shed required for the Winchester-Vail and Springerville-Vail Level C contingency. The overload of the Bicknell 345/230 kV transformer increases by approximately 5% due to this outage. 5.2 With CFE Interconnection With the CFE interconnection, reliability criteria violations were found for single and double outages with maximum local generation. With maximum local generation in the pre-Winchester case, there were 5 overloads in the Desert Southwest Area due to single contingencies. Two of these overloads were load serving transformers where the load is greater than the rating of the transformer. The Winchester interconnection eliminated the overload due to the Vail-South outage and reduced the exposure to the Greenlee-Vail outage to the Winchester-Vail outage. The effect of the Springerville-Greenlee outage was not changed. With maximum local generation in the pre-Winchester case, there were ten Level C double outages that caused lines to be loaded above their emergency ratings. Of these, seven could be fixed with TEP load shed, generator tripping at Apache, or a combination of both. The problems due to the 3 remaining contingencies could be fixed by separating from CFE at Gateway. With the Winchester interconnection, there were twelve Level C double outages that caused lines to be loaded above their emergency ratings. Of these, nine could be fixed with TEP load shed, generator tripping at Apache, or a combination of both. The 3 remaining overloads required separation from CFE at Gateway. With the Winchester interconnection and increased output of the Apache Generating Station, the Winchester-Vail outage was the only outage that was impacted. For this outage, the overload of the Bicknell 345/230 kV transformer increased by approximately 5%. There were ten level C double outages that caused lines or transformers to be loaded above their emergency ratings. Of these, seven could be fixed with TEP load shed, generator tripping at Apache, or a combination of both. The three remaining overloads could be fixed by separating from CFE at Gateway. These three outages were the same in the pre-project case and both post-project cases.

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APPENDIX A Contingency Lists

Single Contingencies

CONTINGENCY TYPE FROM TO CK 1 line 16109 WINCHSTR 16105 VAIL 1 2 line 16101 GREENLEE 16109 WINCHSTR 1 3 line 10292 SAN JUAN 16102 MCKINLEY 1 4 line 10292 SAN JUAN 16102 MCKINLEY 2 5 line 14004 SAGUARO 16000 TORTOLIT 1 6 line 14004 SAGUARO 16000 TORTOLIT 2 7 line 16102 MCKINLEY 16104 SPRINGR 1 8 line 16102 MCKINLEY 16104 SPRINGR 2 9 line 16104 SPRINGR 16100 CORONADO 1

10 line 16104 SPRINGR 16101 GREENLEE 1 11 line 16104 SPRINGR 16106 VAIL2 1 12 line 16105 VAIL 16103 SOUTH 1 13 line 16107 WESTWING 16103 SOUTH 1 14 line 16103 SOUTH 16108 GATEWAY 1 15 line 16103 SOUTH 16108 GATEWAY 2 16 xfmr 16107 WESTWING 14005 WESTWING 1 17 xfmr 15001 CORONADO 16100 CORONADO 1 18 xfmr 16103 SOUTH 16216 SOUTH 1 19 xfmr 16104 SPRINGR 16500 SPR GEN1 1 20 xfmr 16104 SPRINGR 16501 SPR GEN2 1 21 xfmr 16104 SPRINGR 16519 SPR GEN3 1 22 xfmr 16104 SPRINGR 16520 SPR GEN4 1 23 xfmr 16105 VAIL 16518 VAILCT#2 1 24 xfmr 16105 VAIL 16220 VAIL 1 25 xfmr 16106 VAIL2 16220 VAIL 1 26 xfmr 16217 TORTOLIT 16000 TORTOLIT 1 27 xfmr 16217 TORTOLIT 16000 TORTOLIT 2 28 xfmr 16108 GATEWAY 16704 NOGY 1

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Double Contingencies

CONTINGENCY OUTAGE #1 OUTAGE #2 1 WINCHSTR 345.0 - VAIL 345.0 #1 GREENLEE 345.0 - WINCHSTR 345.0 #1 2 WINCHSTR 345.0 - VAIL 345.0 #1 SAN JUAN 345.0 - MCKINLEY 345.0 #1 3 WINCHSTR 345.0 - VAIL 345.0 #1 SAN JUAN 345.0 - MCKINLEY 345.0 #2 4 WINCHSTR 345.0 - VAIL 345.0 #1 HIDALGO 345.0 - GREENLEE 345.0 #0 5 WINCHSTR 345.0 - VAIL 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #1 6 WINCHSTR 345.0 - VAIL 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #2 7 WINCHSTR 345.0 - VAIL 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #1 8 WINCHSTR 345.0 - VAIL 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #2 9 WINCHSTR 345.0 - VAIL 345.0 #1 SPRINGR 345.0 - LUNA 345.0 #1 10 WINCHSTR 345.0 - VAIL 345.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 11 WINCHSTR 345.0 - VAIL 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 12 WINCHSTR 345.0 - VAIL 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 13 WINCHSTR 345.0 - VAIL 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 14 WINCHSTR 345.0 - VAIL 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 15 WINCHSTR 345.0 - VAIL 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 16 WINCHSTR 345.0 - VAIL 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 17 WINCHSTR 345.0 - VAIL 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 18 WINCHSTR 345.0 - VAIL 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 19 WINCHSTR 345.0 - VAIL 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 20 WINCHSTR 345.0 - VAIL 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 21 WINCHSTR 345.0 - VAIL 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 22 WINCHSTR 345.0 - VAIL 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 23 WINCHSTR 345.0 - VAIL 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 24 WINCHSTR 345.0 - VAIL 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 25 WINCHSTR 345.0 - VAIL 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 26 WINCHSTR 345.0 - VAIL 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 27 WINCHSTR 345.0 - VAIL 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 28 GREENLEE 345.0 - WINCHSTR 345.0 #1 SAN JUAN 345.0 - MCKINLEY 345.0 #1 29 GREENLEE 345.0 - WINCHSTR 345.0 #1 SAN JUAN 345.0 - MCKINLEY 345.0 #2 30 GREENLEE 345.0 - WINCHSTR 345.0 #1 HIDALGO 345.0 - GREENLEE 345.0 #0 31 GREENLEE 345.0 - WINCHSTR 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #1 32 GREENLEE 345.0 - WINCHSTR 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #2 33 GREENLEE 345.0 - WINCHSTR 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #1 34 GREENLEE 345.0 - WINCHSTR 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #2 35 GREENLEE 345.0 - WINCHSTR 345.0 #1 SPRINGR 345.0 - LUNA 345.0 #1 36 GREENLEE 345.0 - WINCHSTR 345.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 37 GREENLEE 345.0 - WINCHSTR 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 38 GREENLEE 345.0 - WINCHSTR 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 39 GREENLEE 345.0 - WINCHSTR 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 40 GREENLEE 345.0 - WINCHSTR 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 41 GREENLEE 345.0 - WINCHSTR 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1

35

42 GREENLEE 345.0 - WINCHSTR 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 43 GREENLEE 345.0 - WINCHSTR 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 44 GREENLEE 345.0 - WINCHSTR 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 45 GREENLEE 345.0 - WINCHSTR 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 46 GREENLEE 345.0 - WINCHSTR 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 47 GREENLEE 345.0 - WINCHSTR 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 48 GREENLEE 345.0 - WINCHSTR 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 49 GREENLEE 345.0 - WINCHSTR 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 50 GREENLEE 345.0 - WINCHSTR 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 51 GREENLEE 345.0 - WINCHSTR 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 52 GREENLEE 345.0 - WINCHSTR 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 53 GREENLEE 345.0 - WINCHSTR 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 54 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SAN JUAN 345.0 - MCKINLEY 345.0 #2 55 SAN JUAN 345.0 - MCKINLEY 345.0 #1 HIDALGO 345.0 - GREENLEE 345.0 #0 56 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #1 57 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #2 58 SAN JUAN 345.0 - MCKINLEY 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #1 59 SAN JUAN 345.0 - MCKINLEY 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #2 60 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SPRINGR 345.0 - LUNA 345.0 #1 61 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 62 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 63 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 64 SAN JUAN 345.0 - MCKINLEY 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 65 SAN JUAN 345.0 - MCKINLEY 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 66 SAN JUAN 345.0 - MCKINLEY 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 67 SAN JUAN 345.0 - MCKINLEY 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 68 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 69 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 70 SAN JUAN 345.0 - MCKINLEY 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 71 SAN JUAN 345.0 - MCKINLEY 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 72 SAN JUAN 345.0 - MCKINLEY 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 73 SAN JUAN 345.0 - MCKINLEY 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 74 SAN JUAN 345.0 - MCKINLEY 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 75 SAN JUAN 345.0 - MCKINLEY 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 76 SAN JUAN 345.0 - MCKINLEY 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 77 SAN JUAN 345.0 - MCKINLEY 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 78 SAN JUAN 345.0 - MCKINLEY 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 79 SAN JUAN 345.0 - MCKINLEY 345.0 #2 HIDALGO 345.0 - GREENLEE 345.0 #0 80 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SAGUARO 500.0 - TORTOLIT 500.0 #1 81 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SAGUARO 500.0 - TORTOLIT 500.0 #2 82 SAN JUAN 345.0 - MCKINLEY 345.0 #2 MCKINLEY 345.0 - SPRINGR 345.0 #1 83 SAN JUAN 345.0 - MCKINLEY 345.0 #2 MCKINLEY 345.0 - SPRINGR 345.0 #2 84 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SPRINGR 345.0 - LUNA 345.0 #1 85 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SPRINGR 345.0 - CORONADO 345.0 #1

36

86 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SPRINGR 345.0 - GREENLEE 345.0 #1 87 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SPRINGR 345.0 - VAIL2 345.0 #1 88 SAN JUAN 345.0 - MCKINLEY 345.0 #2 VAIL 345.0 - SOUTH 345.0 #1 89 SAN JUAN 345.0 - MCKINLEY 345.0 #2 WESTWING 345.0 - SOUTH 345.0 #1 90 SAN JUAN 345.0 - MCKINLEY 345.0 #2 BICKNELL 345.0 - VAIL 345.0 #1 91 SAN JUAN 345.0 - MCKINLEY 345.0 #2 GREEN-AE 345.0 - GREENLEE 345.0 #1 92 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SOUTH 345.0 - GATEWAY 345.0 #1 93 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SOUTH 345.0 - GATEWAY 345.0 #2 94 SAN JUAN 345.0 - MCKINLEY 345.0 #2 WESTWING 345.0 - WESTWING 500.0 #1 95 SAN JUAN 345.0 - MCKINLEY 345.0 #2 CORONADO 500.0 - CORONADO 345.0 #1 96 SAN JUAN 345.0 - MCKINLEY 345.0 #2 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 97 SAN JUAN 345.0 - MCKINLEY 345.0 #2 SOUTH 345.0 - SOUTH 138.0 #1 98 SAN JUAN 345.0 - MCKINLEY 345.0 #2 VAIL 345.0 - VAIL 138.0 #1 99 SAN JUAN 345.0 - MCKINLEY 345.0 #2 VAIL2 345.0 - VAIL 138.0 #1

100 SAN JUAN 345.0 - MCKINLEY 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #1 101 SAN JUAN 345.0 - MCKINLEY 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #2 102 SAN JUAN 345.0 - MCKINLEY 345.0 #2 GATEWAY 345.0 - NOGY 115.0 #1 103 HIDALGO 345.0 - GREENLEE 345.0 #0 SAGUARO 500.0 - TORTOLIT 500.0 #1 104 HIDALGO 345.0 - GREENLEE 345.0 #0 SAGUARO 500.0 - TORTOLIT 500.0 #2 105 HIDALGO 345.0 - GREENLEE 345.0 #0 MCKINLEY 345.0 - SPRINGR 345.0 #1 106 HIDALGO 345.0 - GREENLEE 345.0 #0 MCKINLEY 345.0 - SPRINGR 345.0 #2 107 HIDALGO 345.0 - GREENLEE 345.0 #0 SPRINGR 345.0 - LUNA 345.0 #1 108 HIDALGO 345.0 - GREENLEE 345.0 #0 SPRINGR 345.0 - CORONADO 345.0 #1 109 HIDALGO 345.0 - GREENLEE 345.0 #0 SPRINGR 345.0 - GREENLEE 345.0 #1 110 HIDALGO 345.0 - GREENLEE 345.0 #0 SPRINGR 345.0 - VAIL2 345.0 #1 111 HIDALGO 345.0 - GREENLEE 345.0 #0 VAIL 345.0 - SOUTH 345.0 #1 112 HIDALGO 345.0 - GREENLEE 345.0 #0 WESTWING 345.0 - SOUTH 345.0 #1 113 HIDALGO 345.0 - GREENLEE 345.0 #0 BICKNELL 345.0 - VAIL 345.0 #1 114 HIDALGO 345.0 - GREENLEE 345.0 #0 GREEN-AE 345.0 - GREENLEE 345.0 #1 115 HIDALGO 345.0 - GREENLEE 345.0 #0 SOUTH 345.0 - GATEWAY 345.0 #1 116 HIDALGO 345.0 - GREENLEE 345.0 #0 SOUTH 345.0 - GATEWAY 345.0 #2 117 HIDALGO 345.0 - GREENLEE 345.0 #0 WESTWING 345.0 - WESTWING 500.0 #1 118 HIDALGO 345.0 - GREENLEE 345.0 #0 CORONADO 500.0 - CORONADO 345.0 #1 119 HIDALGO 345.0 - GREENLEE 345.0 #0 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 120 HIDALGO 345.0 - GREENLEE 345.0 #0 SOUTH 345.0 - SOUTH 138.0 #1 121 HIDALGO 345.0 - GREENLEE 345.0 #0 VAIL 345.0 - VAIL 138.0 #1 122 HIDALGO 345.0 - GREENLEE 345.0 #0 VAIL2 345.0 - VAIL 138.0 #1 123 HIDALGO 345.0 - GREENLEE 345.0 #0 TORTOLIT 138.0 - TORTOLIT 500.0 #1 124 HIDALGO 345.0 - GREENLEE 345.0 #0 TORTOLIT 138.0 - TORTOLIT 500.0 #2 125 HIDALGO 345.0 - GREENLEE 345.0 #0 GATEWAY 345.0 - NOGY 115.0 #1 126 SAGUARO 500.0 - TORTOLIT 500.0 #1 SAGUARO 500.0 - TORTOLIT 500.0 #2 127 SAGUARO 500.0 - TORTOLIT 500.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #1 128 SAGUARO 500.0 - TORTOLIT 500.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #2 129 SAGUARO 500.0 - TORTOLIT 500.0 #1 SPRINGR 345.0 - LUNA 345.0 #1

37

130 SAGUARO 500.0 - TORTOLIT 500.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 131 SAGUARO 500.0 - TORTOLIT 500.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 132 SAGUARO 500.0 - TORTOLIT 500.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 133 SAGUARO 500.0 - TORTOLIT 500.0 #1 VAIL 345.0 - SOUTH 345.0 #1 134 SAGUARO 500.0 - TORTOLIT 500.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 135 SAGUARO 500.0 - TORTOLIT 500.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 136 SAGUARO 500.0 - TORTOLIT 500.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 137 SAGUARO 500.0 - TORTOLIT 500.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 138 SAGUARO 500.0 - TORTOLIT 500.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 139 SAGUARO 500.0 - TORTOLIT 500.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 140 SAGUARO 500.0 - TORTOLIT 500.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 141 SAGUARO 500.0 - TORTOLIT 500.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 142 SAGUARO 500.0 - TORTOLIT 500.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 143 SAGUARO 500.0 - TORTOLIT 500.0 #1 VAIL 345.0 - VAIL 138.0 #1 144 SAGUARO 500.0 - TORTOLIT 500.0 #1 VAIL2 345.0 - VAIL 138.0 #1 145 SAGUARO 500.0 - TORTOLIT 500.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 146 SAGUARO 500.0 - TORTOLIT 500.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 147 SAGUARO 500.0 - TORTOLIT 500.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 148 SAGUARO 500.0 - TORTOLIT 500.0 #2 MCKINLEY 345.0 - SPRINGR 345.0 #1 149 SAGUARO 500.0 - TORTOLIT 500.0 #2 MCKINLEY 345.0 - SPRINGR 345.0 #2 150 SAGUARO 500.0 - TORTOLIT 500.0 #2 SPRINGR 345.0 - LUNA 345.0 #1 151 SAGUARO 500.0 - TORTOLIT 500.0 #2 SPRINGR 345.0 - CORONADO 345.0 #1 152 SAGUARO 500.0 - TORTOLIT 500.0 #2 SPRINGR 345.0 - GREENLEE 345.0 #1 153 SAGUARO 500.0 - TORTOLIT 500.0 #2 SPRINGR 345.0 - VAIL2 345.0 #1 154 SAGUARO 500.0 - TORTOLIT 500.0 #2 VAIL 345.0 - SOUTH 345.0 #1 155 SAGUARO 500.0 - TORTOLIT 500.0 #2 WESTWING 345.0 - SOUTH 345.0 #1 156 SAGUARO 500.0 - TORTOLIT 500.0 #2 BICKNELL 345.0 - VAIL 345.0 #1 157 SAGUARO 500.0 - TORTOLIT 500.0 #2 GREEN-AE 345.0 - GREENLEE 345.0 #1 158 SAGUARO 500.0 - TORTOLIT 500.0 #2 SOUTH 345.0 - GATEWAY 345.0 #1 159 SAGUARO 500.0 - TORTOLIT 500.0 #2 SOUTH 345.0 - GATEWAY 345.0 #2 160 SAGUARO 500.0 - TORTOLIT 500.0 #2 WESTWING 345.0 - WESTWING 500.0 #1 161 SAGUARO 500.0 - TORTOLIT 500.0 #2 CORONADO 500.0 - CORONADO 345.0 #1 162 SAGUARO 500.0 - TORTOLIT 500.0 #2 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 163 SAGUARO 500.0 - TORTOLIT 500.0 #2 SOUTH 345.0 - SOUTH 138.0 #1 164 SAGUARO 500.0 - TORTOLIT 500.0 #2 VAIL 345.0 - VAIL 138.0 #1 165 SAGUARO 500.0 - TORTOLIT 500.0 #2 VAIL2 345.0 - VAIL 138.0 #1 166 SAGUARO 500.0 - TORTOLIT 500.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #1 167 SAGUARO 500.0 - TORTOLIT 500.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #2 168 SAGUARO 500.0 - TORTOLIT 500.0 #2 GATEWAY 345.0 - NOGY 115.0 #1 169 MCKINLEY 345.0 - SPRINGR 345.0 #1 MCKINLEY 345.0 - SPRINGR 345.0 #2 170 MCKINLEY 345.0 - SPRINGR 345.0 #1 SPRINGR 345.0 - LUNA 345.0 #1 171 MCKINLEY 345.0 - SPRINGR 345.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 172 MCKINLEY 345.0 - SPRINGR 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 173 MCKINLEY 345.0 - SPRINGR 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1

38

174 MCKINLEY 345.0 - SPRINGR 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 175 MCKINLEY 345.0 - SPRINGR 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 176 MCKINLEY 345.0 - SPRINGR 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 177 MCKINLEY 345.0 - SPRINGR 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 178 MCKINLEY 345.0 - SPRINGR 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 179 MCKINLEY 345.0 - SPRINGR 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 180 MCKINLEY 345.0 - SPRINGR 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 181 MCKINLEY 345.0 - SPRINGR 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 182 MCKINLEY 345.0 - SPRINGR 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 183 MCKINLEY 345.0 - SPRINGR 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 184 MCKINLEY 345.0 - SPRINGR 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 185 MCKINLEY 345.0 - SPRINGR 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 186 MCKINLEY 345.0 - SPRINGR 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 187 MCKINLEY 345.0 - SPRINGR 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 188 MCKINLEY 345.0 - SPRINGR 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 189 MCKINLEY 345.0 - SPRINGR 345.0 #2 SPRINGR 345.0 - LUNA 345.0 #1 190 MCKINLEY 345.0 - SPRINGR 345.0 #2 SPRINGR 345.0 - CORONADO 345.0 #1 191 MCKINLEY 345.0 - SPRINGR 345.0 #2 SPRINGR 345.0 - GREENLEE 345.0 #1 192 MCKINLEY 345.0 - SPRINGR 345.0 #2 SPRINGR 345.0 - VAIL2 345.0 #1 193 MCKINLEY 345.0 - SPRINGR 345.0 #2 VAIL 345.0 - SOUTH 345.0 #1 194 MCKINLEY 345.0 - SPRINGR 345.0 #2 WESTWING 345.0 - SOUTH 345.0 #1 195 MCKINLEY 345.0 - SPRINGR 345.0 #2 BICKNELL 345.0 - VAIL 345.0 #1 196 MCKINLEY 345.0 - SPRINGR 345.0 #2 GREEN-AE 345.0 - GREENLEE 345.0 #1 197 MCKINLEY 345.0 - SPRINGR 345.0 #2 SOUTH 345.0 - GATEWAY 345.0 #1 198 MCKINLEY 345.0 - SPRINGR 345.0 #2 SOUTH 345.0 - GATEWAY 345.0 #2 199 MCKINLEY 345.0 - SPRINGR 345.0 #2 WESTWING 345.0 - WESTWING 500.0 #1 200 MCKINLEY 345.0 - SPRINGR 345.0 #2 CORONADO 500.0 - CORONADO 345.0 #1 201 MCKINLEY 345.0 - SPRINGR 345.0 #2 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 202 MCKINLEY 345.0 - SPRINGR 345.0 #2 SOUTH 345.0 - SOUTH 138.0 #1 203 MCKINLEY 345.0 - SPRINGR 345.0 #2 VAIL 345.0 - VAIL 138.0 #1 204 MCKINLEY 345.0 - SPRINGR 345.0 #2 VAIL2 345.0 - VAIL 138.0 #1 205 MCKINLEY 345.0 - SPRINGR 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #1 206 MCKINLEY 345.0 - SPRINGR 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #2 207 MCKINLEY 345.0 - SPRINGR 345.0 #2 GATEWAY 345.0 - NOGY 115.0 #1 208 SPRINGR 345.0 - LUNA 345.0 #1 SPRINGR 345.0 - CORONADO 345.0 #1 209 SPRINGR 345.0 - LUNA 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 210 SPRINGR 345.0 - LUNA 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 211 SPRINGR 345.0 - LUNA 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 212 SPRINGR 345.0 - LUNA 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 213 SPRINGR 345.0 - LUNA 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 214 SPRINGR 345.0 - LUNA 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 215 SPRINGR 345.0 - LUNA 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 216 SPRINGR 345.0 - LUNA 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 217 SPRINGR 345.0 - LUNA 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1

39

218 SPRINGR 345.0 - LUNA 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 219 SPRINGR 345.0 - LUNA 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 220 SPRINGR 345.0 - LUNA 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 221 SPRINGR 345.0 - LUNA 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 222 SPRINGR 345.0 - LUNA 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 223 SPRINGR 345.0 - LUNA 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 224 SPRINGR 345.0 - LUNA 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 225 SPRINGR 345.0 - LUNA 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 226 SPRINGR 345.0 - CORONADO 345.0 #1 SPRINGR 345.0 - GREENLEE 345.0 #1 227 SPRINGR 345.0 - CORONADO 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 228 SPRINGR 345.0 - CORONADO 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 229 SPRINGR 345.0 - CORONADO 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 230 SPRINGR 345.0 - CORONADO 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 231 SPRINGR 345.0 - CORONADO 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 232 SPRINGR 345.0 - CORONADO 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 233 SPRINGR 345.0 - CORONADO 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 234 SPRINGR 345.0 - CORONADO 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 235 SPRINGR 345.0 - CORONADO 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 236 SPRINGR 345.0 - CORONADO 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 237 SPRINGR 345.0 - CORONADO 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 238 SPRINGR 345.0 - CORONADO 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 239 SPRINGR 345.0 - CORONADO 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 240 SPRINGR 345.0 - CORONADO 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 241 SPRINGR 345.0 - CORONADO 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 242 SPRINGR 345.0 - CORONADO 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 243 SPRINGR 345.0 - GREENLEE 345.0 #1 SPRINGR 345.0 - VAIL2 345.0 #1 244 SPRINGR 345.0 - GREENLEE 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 245 SPRINGR 345.0 - GREENLEE 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 246 SPRINGR 345.0 - GREENLEE 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 247 SPRINGR 345.0 - GREENLEE 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 248 SPRINGR 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 249 SPRINGR 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 250 SPRINGR 345.0 - GREENLEE 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 251 SPRINGR 345.0 - GREENLEE 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 252 SPRINGR 345.0 - GREENLEE 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 253 SPRINGR 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 254 SPRINGR 345.0 - GREENLEE 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 255 SPRINGR 345.0 - GREENLEE 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 256 SPRINGR 345.0 - GREENLEE 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 257 SPRINGR 345.0 - GREENLEE 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 258 SPRINGR 345.0 - GREENLEE 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 259 SPRINGR 345.0 - VAIL2 345.0 #1 VAIL 345.0 - SOUTH 345.0 #1 260 SPRINGR 345.0 - VAIL2 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 261 SPRINGR 345.0 - VAIL2 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1

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262 SPRINGR 345.0 - VAIL2 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 263 SPRINGR 345.0 - VAIL2 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 264 SPRINGR 345.0 - VAIL2 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 265 SPRINGR 345.0 - VAIL2 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 266 SPRINGR 345.0 - VAIL2 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 267 SPRINGR 345.0 - VAIL2 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 268 SPRINGR 345.0 - VAIL2 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 269 SPRINGR 345.0 - VAIL2 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 270 SPRINGR 345.0 - VAIL2 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 271 SPRINGR 345.0 - VAIL2 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 272 SPRINGR 345.0 - VAIL2 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 273 SPRINGR 345.0 - VAIL2 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 274 VAIL 345.0 - SOUTH 345.0 #1 WESTWING 345.0 - SOUTH 345.0 #1 275 VAIL 345.0 - SOUTH 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 276 VAIL 345.0 - SOUTH 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 277 VAIL 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 278 VAIL 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 279 VAIL 345.0 - SOUTH 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 280 VAIL 345.0 - SOUTH 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 281 VAIL 345.0 - SOUTH 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 282 VAIL 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 283 VAIL 345.0 - SOUTH 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 284 VAIL 345.0 - SOUTH 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 285 VAIL 345.0 - SOUTH 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 286 VAIL 345.0 - SOUTH 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 287 VAIL 345.0 - SOUTH 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 288 WESTWING 345.0 - SOUTH 345.0 #1 BICKNELL 345.0 - VAIL 345.0 #1 289 WESTWING 345.0 - SOUTH 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 290 WESTWING 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 291 WESTWING 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 292 WESTWING 345.0 - SOUTH 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 293 WESTWING 345.0 - SOUTH 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 294 WESTWING 345.0 - SOUTH 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 295 WESTWING 345.0 - SOUTH 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 296 WESTWING 345.0 - SOUTH 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 297 WESTWING 345.0 - SOUTH 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 298 WESTWING 345.0 - SOUTH 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 299 WESTWING 345.0 - SOUTH 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 300 WESTWING 345.0 - SOUTH 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 301 BICKNELL 345.0 - VAIL 345.0 #1 GREEN-AE 345.0 - GREENLEE 345.0 #1 302 BICKNELL 345.0 - VAIL 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 303 BICKNELL 345.0 - VAIL 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 304 BICKNELL 345.0 - VAIL 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 305 BICKNELL 345.0 - VAIL 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1

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306 BICKNELL 345.0 - VAIL 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 307 BICKNELL 345.0 - VAIL 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 308 BICKNELL 345.0 - VAIL 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 309 BICKNELL 345.0 - VAIL 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 310 BICKNELL 345.0 - VAIL 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 311 BICKNELL 345.0 - VAIL 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 312 BICKNELL 345.0 - VAIL 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 313 GREEN-AE 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #1 314 GREEN-AE 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 315 GREEN-AE 345.0 - GREENLEE 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 316 GREEN-AE 345.0 - GREENLEE 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 317 GREEN-AE 345.0 - GREENLEE 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 318 GREEN-AE 345.0 - GREENLEE 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 319 GREEN-AE 345.0 - GREENLEE 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 320 GREEN-AE 345.0 - GREENLEE 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 321 GREEN-AE 345.0 - GREENLEE 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 322 GREEN-AE 345.0 - GREENLEE 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 323 GREEN-AE 345.0 - GREENLEE 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 324 SOUTH 345.0 - GATEWAY 345.0 #1 SOUTH 345.0 - GATEWAY 345.0 #2 325 SOUTH 345.0 - GATEWAY 345.0 #1 WESTWING 345.0 - WESTWING 500.0 #1 326 SOUTH 345.0 - GATEWAY 345.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 327 SOUTH 345.0 - GATEWAY 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 328 SOUTH 345.0 - GATEWAY 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 329 SOUTH 345.0 - GATEWAY 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 330 SOUTH 345.0 - GATEWAY 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 331 SOUTH 345.0 - GATEWAY 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 332 SOUTH 345.0 - GATEWAY 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 333 SOUTH 345.0 - GATEWAY 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 334 SOUTH 345.0 - GATEWAY 345.0 #2 WESTWING 345.0 - WESTWING 500.0 #1 335 SOUTH 345.0 - GATEWAY 345.0 #2 CORONADO 500.0 - CORONADO 345.0 #1 336 SOUTH 345.0 - GATEWAY 345.0 #2 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 337 SOUTH 345.0 - GATEWAY 345.0 #2 SOUTH 345.0 - SOUTH 138.0 #1 338 SOUTH 345.0 - GATEWAY 345.0 #2 VAIL 345.0 - VAIL 138.0 #1 339 SOUTH 345.0 - GATEWAY 345.0 #2 VAIL2 345.0 - VAIL 138.0 #1 340 SOUTH 345.0 - GATEWAY 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #1 341 SOUTH 345.0 - GATEWAY 345.0 #2 TORTOLIT 138.0 - TORTOLIT 500.0 #2 342 SOUTH 345.0 - GATEWAY 345.0 #2 GATEWAY 345.0 - NOGY 115.0 #1 343 WESTWING 345.0 - WESTWING 500.0 #1 CORONADO 500.0 - CORONADO 345.0 #1 344 WESTWING 345.0 - WESTWING 500.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 345 WESTWING 345.0 - WESTWING 500.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 346 WESTWING 345.0 - WESTWING 500.0 #1 VAIL 345.0 - VAIL 138.0 #1 347 WESTWING 345.0 - WESTWING 500.0 #1 VAIL2 345.0 - VAIL 138.0 #1 348 WESTWING 345.0 - WESTWING 500.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 349 WESTWING 345.0 - WESTWING 500.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2

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350 WESTWING 345.0 - WESTWING 500.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 351 CORONADO 500.0 - CORONADO 345.0 #1 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 352 CORONADO 500.0 - CORONADO 345.0 #1 SOUTH 345.0 - SOUTH 138.0 #1 353 CORONADO 500.0 - CORONADO 345.0 #1 VAIL 345.0 - VAIL 138.0 #1 354 CORONADO 500.0 - CORONADO 345.0 #1 VAIL2 345.0 - VAIL 138.0 #1 355 CORONADO 500.0 - CORONADO 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 356 CORONADO 500.0 - CORONADO 345.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 357 CORONADO 500.0 - CORONADO 345.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 358 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 SOUTH 345.0 - SOUTH 138.0 #1 359 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 VAIL 345.0 - VAIL 138.0 #1 360 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 VAIL2 345.0 - VAIL 138.0 #1 361 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 TORTOLIT 138.0 - TORTOLIT 500.0 #1 362 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 TORTOLIT 138.0 - TORTOLIT 500.0 #2 363 MCKINLEY 345.0 - YAHTAHEY 115.0 #0 GATEWAY 345.0 - NOGY 115.0 #1 364 SOUTH 345.0 - SOUTH 138.0 #1 VAIL 345.0 - VAIL 138.0 #1 365 SOUTH 345.0 - SOUTH 138.0 #1 VAIL2 345.0 - VAIL 138.0 #1 366 SOUTH 345.0 - SOUTH 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 367 SOUTH 345.0 - SOUTH 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 368 SOUTH 345.0 - SOUTH 138.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 369 VAIL 345.0 - VAIL 138.0 #1 VAIL2 345.0 - VAIL 138.0 #1 370 VAIL 345.0 - VAIL 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 371 VAIL 345.0 - VAIL 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 372 VAIL 345.0 - VAIL 138.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 373 VAIL2 345.0 - VAIL 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #1 374 VAIL2 345.0 - VAIL 138.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 375 VAIL2 345.0 - VAIL 138.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 376 TORTOLIT 138.0 - TORTOLIT 500.0 #1 TORTOLIT 138.0 - TORTOLIT 500.0 #2 377 TORTOLIT 138.0 - TORTOLIT 500.0 #1 GATEWAY 345.0 - NOGY 115.0 #1 378 TORTOLIT 138.0 - TORTOLIT 500.0 #2 GATEWAY 345.0 - NOGY 115.0 #1

Winchester Substation Interconnection Impact Study · Winchester Substation Interconnection Impact...

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