Craig Quist Craig Quist

Transcription

1 TRANSMISSION PLANNING Craig Quist, Manager Transmission Development & Planning PacifiCorp 1407 West North Temple, Suite 275 Salt Lake City, Utah FAX Date: March 3, 2011 To: Kyle R. Kohne TSS Chairman BONNEVILLE POWER ADMINISTRATION P.O. Box 491 MS, TPP-OPP-3 Vancouver, WA Mr. Kent Bolton WECC STAFF University of Utah Research Park 615 Arapeen Drive, Suite 210 Salt Lake City, Utah Subject: PacifiCorp 2011 Annual Progress Report Dear: Kyle and Kent, Per the WECC Planning Coordination Committee reporting guidelines, attached is the PacifiCorp 2011 Annual Progress Report on transmission and generation additions. Should you have any questions, or need additional information, please contact me at (801) Sincerely, Craig Quist Craig Quist cc: File: TSS Members WECC Staff Darrell Gerrard PacifiCorp Annual Progress Report.doc

2 Table of Contents I. Midpoint-Summer Lake 500 kv, Phase 2 Rating Study (May 2011)...4 II. TOT 4A Voltage Support Project (June 2008 to September 2012)...5 III. Path C Reinforcement-Populus to Terminal 345 kv Double Circuit Line (Completed, In-service on 11/19/ 2010)...6 IV. Three peaks Substation on Sigurd-Red Butte 345 kv Line (Completed, May 2010)...8 V. Pinto-Huntington 345 kv Series Capacitor ( Oct April 2011)...10 VI. Camp Williams-Ninety South 345 kv Double Circuit Line (Completed Dec, 2010)...11 VII. Wallula to McNary 230 kv transmission Line #2 (Dec 2012)...12 VIII. Casper-Dave Johnston 230 kv #1 & #2 Line Rebuild (Completed January 2011)...13 IX. Red Butte/Central to St. George 345 kv Double Circuit Line (May 2010 May 2019)...14 X. Red Butte Static VAr Compensator (May 2011)...15 XI. California-Oregon Intertie Upgrade Maintain 4800 MW Rating ( May 2011)..16 XII. Vantage-Pomona Heights 230 kv Line (December 2013)...17 XIII. Three Mile Knoll-Install 138/46 kv 75 MVA Transformer (Completed April 2010)...18 XIV. Clover Substation-Add 345/138 kv Transformer 450 MVA (June 2012)...19 XV. Syracuse 345/138 #2 Transformer 400 MVA (May, 2015)...20 XVI. Swift-Troutdale 230 kv Line (October 2012) Cancelled...21 XVII. Malin 500 kv Series Capacitor Replacement (December 2010, Completed)...22 XVIII. Parish Gap Substation (June 2010, Completed)...23 XIX. County System Upgrade (May 2013)...24 XX. Line 37 Conversion Project (October 2012)...25 XXI. Line 3 Conversion Project (November 2013)...26 XXII. Sigurd-Three Peaks-Hurricane-St George 345 kv line ( Delayed beyond 2021)

3 XXIII. Terminal 345/138 kv #1 & #2 transformer (Two- 700 MVA) (May 2012)...28 XXIV. Camp Williams-Terminal 345 kv #1 line loop in to Oquirrh Sub (June 2011)...29 XXV. White City Substation (May 2013) Remove this project, same as the Whetstone project...30 XXVI. Copco to Weed Junction Line Conversion (Nov 2017)...31 XXVII. Midvalley 345/138 kv #1 & #2 transformer replacement 700 MVA (May 2016)...32 XXVIII. Union Gap 230/115 kv increase in capacity, add a third 150 MVA transformer (Nov 2013)...33 XXIX. Mt. Shasta Substation, (November 2016)...34 XXX. Copco Substation Increase (Dec 2012)...35 XXXI. Red Butte switch yard capacitor bank (Oct 2011) Remove this project, included in the Red Butte SVS project XXXII. Ben Lomond 345/138 kv #2 transformer 450 MVA (June 2012)...37 XXXIII. Whetstone 230/115 kv Substation (Phase 1: May 2012, Phase 2: May 2013)...38 XXXIV. Central substation 345/138 kv transformer replacement 450 MVA (May 2014) Cancelled...39 XXXV. Pilot Butte 500/230 kv new sub/ new 230/115 kv sub/ convert Bend Redmond 69 kv line Plan of service is being reviewed and this is not a firm date (Sept 2017), Remove this project, this is a BPA project XXXVI. Terminal, install 3 rd 345/138 kv transformer of 700 MVA (May 2015) Cancelled...41 XXXVII. Yellowtail substation, install 2 nd 230/161 kv transformer of 100 MVA ( )...42 XXXVIII. Klamath Co Gen kv Transformer (Sept 2018)...43 XXXIX. Big Grassy Substation 161 kv, install a 42 MVAr cap bank (May 2018)...44 XL. Three Mile Knoll, install 2 nd 345/138 kv transformer of 700 MVA (May 2018)

4 XLI. Meridian Substation : Install Two 230 kv shunt capacitor banks of 130 MVAr each (June 2011)...46 XLII. St. George substation 345/138 kv transformer 700 MVA (2015)...47 XLIII. Gateway South Transmission Project...48 Plan of Service...48 Planned Operating Date...51 Transfer Capability...51 XLIV. Gateway West Transmission Project (Populus-Windstar)...52 Planned Operating Date...54 Transfer Capability...55 XLV. Gateway Central Transmission Project...56 Planned Operating Date...57 Transfer Capability...57 XLVI. Future Generation Projects

5 I. Midpoint-Summer Lake 500 kv, Phase 2 Rating Study (May 2011) 1. Name: Midpoint-Summer Lake 500 kv, Phase 2 Rating Study (Sponsor) 3. One-Line Diagram: Existing Line. 4. Status: Entered Phase 3 on July 22, Two 230 kv capacitor banks would be installed at the Meridian Substation (See Section XLI). Expected facility in service date is May 1, Facilities: N/A B. Studies Studies are being conducted by NOPSG. The WECC 2007HS3-OP base case was used to determine the non-simultaneous rating for the summer seasons and any interactions with other transmission paths for the maximum flow on the Midpoint Summer Lake 500 kv line in the east bound direction. Flows on the NW- Idaho path have been kept within the existing west to east rating of 1200 MW. C. Impact on Other Systems Study results indicate that interactions exist between the Midpoint-Summer Lake 500 kv line, the NW-Idaho path, and COI path. 4

6 II. TOT 4A Voltage Support Project (June 2008 to September 2012) 1. Name: TOT 4A Voltage Support Project (Sponsor) 3. One-Line Diagram: Not Available. 4. Status: Technical studies have been completed and voltage support facilities have been included in the PacifiCorp capital budget. The projected in-service date for each facility is noted below. 6. Facilities: The following Facilities have been identified for Wyoming voltage support: Atlantic City 230 kv, 15 MVAr Capacitor (, 11/11/2010) Riverton 230 kv, 30 MVAr Capacitor (8/15/2010) Midwest 230 kv, 30 MVAr Capacitor (10/27/2010) Platte/Miners 230 kv -24/+24 MVAr Static VAr System and 2-25 MVAr Shunt Caps (Sept, 2012) B. Studies Wyoming 2010 transfer capability studies, which evaluated the impacts of projected Wyoming load growth (both projected and large customer) on the TOT 4A path rating, have identified the need for additional voltage support facilities (see facilities above). Studies have been shared with other Wyoming transmission owners. C. Impact on Other Systems Technical studies have indicated that based on projected load growth, the reactive support is needed to maintain the TOT 4A/4B Nomogram at its current transfer levels. As these facilities are required for central Wyoming voltage support, no other paths are affected. 5

7 III. Path C Reinforcement-Populus to Terminal 345 kv Double Circuit Line (Completed, In-service on 11/19/ 2010) 1. Name: Populus-Terminal Project 3. One-Line Diagram: Attached 4. Status: This project was completed 11/19/ Facilities: This project would increase transfer capability from southeast Idaho to Utah and includes the construction of 135 miles of new double circuit 345 kv lines from a new station (Populus) near Downey, Idaho, through Ben Lomond to Terminal (near Salt Lake City, Utah). B. Studies Entered Phase 3 on November 3, Completed Phase 3, 11/24/2010. C. Impact on Other Systems The project would increase the rating of Path C. The Phase 2 rating study addressed all impacts on other systems. 6

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9 IV. Three peaks Substation on Sigurd-Red Butte 345 kv Line (Completed, May 2010) 1. Name: Three Peaks 345 kv Substation 3. One-Line Diagram: Attached 4. Status: The new substation was planned to accommodate future load growth in the Cedar City, Utah area. The project was completed by May Facilities: This project constructed the Three Peaks 345/138 kv substation and looped the existing Sigurd-Red Butte 345 kv line into the new substation. A 345/138 kv, 450 MVA transformer was installed. In addition, a 55 MVAr shunt line reactor and a series capacitor was added within the new substation on the Three Peaks-Sigurd 345 kv line. B. Studies Studies have shown that additional capacity and voltage support are needed in order to serve future load growth in the Cedar City, Utah area. This project provided for these needs. C. Impact on Other Systems This project would have no regional impacts. Regional SSR studies have been done to insure no adverse impacts. 8

10 Proposed Three Peaks kv Substation Phase kv to Red Butte 35 ohm 1500/1800 amp 345 kv to Sigurd 3000 Amps 55 MVar ss kv 450 MVA 138 kv to WECCO/ West Cedar #3 Future Bay 30 MVAR Note: All 345 kv breakers and switches are 2000A, except the center breaker and switches will be 3000A. All 138 kv breakers and switches are 2000A. S. Murdock, Area Planning S. Smith, Planning Technologies ThreePeaksOneLine-1 7/31/2007 9

11 V. Pinto-Huntington 345 kv Series Capacitor ( Oct April 2011) 1. Name: Pinto-Huntington 345 kv Series Capacitor 3. One-Line Diagram: Not Available 4. Status: The project is currently in the construction stage. The project should be completed by April Facilities: A 345 kv series capacitor bank would be installed at Pinto on the Pinto-Huntington 345 kv line. B. Studies A 345 kv series capacitor bank would be installed at Pinto on the Pinto-Huntington 345 kv line. Recent studies have indicated a need for additional transmission capacity from Huntington to the Pinto substation to provide capacity for southeast Utah area load growth. The SSR study reports have been released and PacifiCorp has responded to questions. C. Impact on Other Systems This project would have no regional impacts. SSR studies have been conducted and study results have been shared with Four Corners E&O Committee 10

12 VI. Camp Williams-Ninety South 345 kv Double Circuit Line (Completed Dec, 2010) 1. Name: Camp Williams-Ninety South 345 kv Double Circuit line 3. One-Line Diagram: Not Available 4. Status: This project was completed in Dec Generation: This project addition is associated with new generation resources south of Camp Williams, which would tie into the existing 345 kv transmission grid. 6. Facilities: Addition of the Camp Williams-Ninety South 345 kv double circuit line (~10 miles), and expansion of the substations at each end. In addition to this line, dynamic voltage support will also be required in the Wasatch Front. B. Studies Recent studies have shown that additional transmission capacity and voltage support are needed north of Camp Williams substation in order to serve future load growth in the Wasatch front with future resources located south of the Salt Lake Valley. This project would provide for these needs. C. Impact on Other Systems This project would have no regional impacts. 11

13 VII. Wallula to McNary 230 kv transmission Line #2 (Dec 2012) 1. Name: Wallula to McNary 230 kv Transmission Line #2 3. One-Line Diagram: Not Available 4. Status: This project is in Phase II of the WECC Facility Rating Process. The projected inservice date is December Facilities: The Wallula to McNary 230 kv line would be a single circuit transmission line with line terminals at Wallula and McNary Substations. B. Studies Studies have indicated that the existing Wallula to McNary 230 kv line has no available transmission capacity remaining. Recent interconnection requests and transmission service requests from new generators (Wind Farms) indicate the need for additional transmission capacity in the area. The project would provide for these needs. C. Impact on Other Systems This project may have impacts on other regional facilities most notably BPA as the project has a terminal at BPA s McNary Substation. 1 Subject to agreement and completion of interconnection requirements as specified by Bonneville Power Administration at the McNary substation. 12

14 VIII. Casper-Dave Johnston 230 kv #1 & #2 Line Rebuild (Completed January 2011) 1. Name: Casper-Dave Johnston 230 kv #1 & #2 lines 3. One-Line Diagram: Not Available 4. Status: Dave Johnston Casper #2 was completed April 2010, Dave Johnston Casper #1 was completed Dec Generation: The rebuilding of Casper-Dave Johnston line #1 required 3-4 months to complete. During construction, operating limitations were placed on the Dave Johnston generating plant. The outage of this line was coordinated with PacifiCorp Energy. 6. Facilities: Loop the Dave Johnston-Spence 230 kv line into Casper. This formed the Dave Johnston-Casper 230 kv #2 line and the Casper-Spence 230 kv line. Reconductor the Dave Johnston-Casper 230 kv #2 line from 954 ACSR to ACSS/TW. Also; rebuild the Dave Johnston-Casper 230 kv #1 line from 954 ACSR to ACSS/TW. B. Studies Separate technical studies were performed by both PacifiCorp and Basin Electric have demonstrated the need to rebuild this line to maintain the TOT 4A/4B nomograms capabilities. C. Impact on Other Systems This project would have no regional impacts. 13

15 IX. Red Butte/Central to St. George 345 kv Double Circuit Line (May 2010 May 2019) 1. Name: Red Butte/Central to St. George 345 kv Double Circuit Line, UAMPS 3. One-Line Diagram: Not Available 4. Status: The initial phase of this project was completed May 2010.Second stage will be completed by May 2012 B. Facilities: This project would rebuild the existing 20 mile 138 kv line from Red Butte to St. George to a new double circuit 345 kv line. This line would initially be operated as a single 138 kv line in 2010 and as two 138 kv lines by May Summer 2015: Build St.George 345 kv substation with 700 MVA, 345/138 kv transformer and operate second Red Butte-St.George circuit at 345 kv. C. Studies Joint studies conducted by the participants demonstrated the need for additional capacity into the St. George area due to rapid load growth in the area. D. Impact on Other Systems This project would have no regional impacts. 14

16 X. Red Butte Static VAr Compensator (May 2011) 1. Name: Red Butte SVC Project 4. Status: This project is in the preliminary design stage. It is expected to be in service by May B. Facilities: The size of the SVC is -75/+350 MVAr. 2* 150 MVAr, 345 kv dynamically switched shunt capacitor banks and a 60 MVAr 345 kv shunt capacitor bank. C. Studies Studies have shown the need for dynamic voltage support in the Red Butte area in order to maintain transfer capability on the TOT 2C path with the rapid load growth in the St. George area. D. Impact on Other Systems Maintains the transfer capability on TOT 2C transmission path. 15

17 XI. California-Oregon Intertie Upgrade Maintain 4800 MW Rating ( May 2011) 1. Name: California-Oregon Intertie Upgrade 2. Participants: BPA, PacifiCorp 4. Status: The projected in service date for this project is May PacifiCorp is one of multiple AC intertie owners. BPA is the lead entity for this project. 6. Facilities: This project will upgrade segments of the California-Oregon Intertie (COI) path in order to maintain the 4800 MW rating on the COI path. B. Studies The studies for this project are ongoing. C. Impact on Other Systems This project is a joint project with all COI facility owners. This project is related to reinforcements in the BPA area. 16

18 XII. Vantage-Pomona Heights 230 kv Line (December 2013) 1. Name: Vantage Pomona Heights 230 kv Line 4. Status: The project is in the environmental impact studies stage; these studies are expected to be completed by September of Formal approval for a line route is expected by early This will be followed by engineering design and acquiring right of way. Construction will follow soon after. The projected in-service date is November Facilities: This project will construct a new 230 kv line between the Vantage and Pomona Heights 230 kv buses in Washington State. B. Studies Joint Studies performed by the Mid Columbia Study Team indicated the need for this project. For the loss of the existing Pomona to Wanapum 230 kv transmission line, low voltage and thermal overloads occur in the Yakima/Mid C area. This project corrects these problems. C. Impact on Other Systems This project provides needed reinforcement to the MIDC transmission systems. 17

19 XIII. Three Mile Knoll-Install 138/46 kv (75 MVA) Transformer (Completed April 2010) 1. Name: Three Mile Knoll-Install 138/46 kv (75 MVA) Transformer 4. Status: The in-service date of this project was April Facilities: This project would install a 138/46 kv (75 MVA) transformer at the Three Mile Knoll substation for load services. B. Studies Studies for this project are completed. C. Impact on Other Systems This project will have no regional impacts. 18

20 XIV. Clover Substation-Add 345/138 kv (450 MVA) Transformer (June 2012) 1. Name: Mona Substation-Add 345/138 kv Transformer 4. Status: The projected in-service date of this project is June Facilities: This project would add a 345/138 kv (450 MVA) Transformer to the Clover substation. B. Studies Studies for this project are currently underway. C. Impact on Other Systems This project would have no regional impacts although Mona substation is jointly owned by PacifiCorp, Deseret, and the Los Angeles Department of Water and Power. 19

21 XV. Syracuse 345/138 (400 MVA) #2 Transformer (May, 2015) 1. Name: Syracuse 345/138 #2 Transformer, 400 MVA 4. Status: The projected in-service date of this project is May Facilities: This project would install a second 345/138 kv (400 MVA) transformer at the Syracuse substation for load service. B. Studies Studies for this project are currently underway. C. Impact on Other Systems This project would have no regional impacts. 20

22 XVI. Swift-Troutdale 230 kv Line (October 2012) Cancelled 1. Name: Swift-Troutdale 230 kv Line 4. Status: The projected in-service date of this project was October, Facilities: This project would construct a new 230 kv line between PacifiCorp s Swift and Troutdale 230 kv substations. B. Studies Recent Generation interconnection requests have demonstrated the need for additional transmission capacity from the Swift Projects (Swift 1 & 2). This project provides the needed transmission capacity. C. Impact on Other Systems This project would impact the South of Alston Path. With the impacted parties being BPA and Portland General Electric. 21

23 XVII. Malin 500 kv Series Capacitor Replacement (December 2010, Completed) 1. Name: Malin Substation 4. Status: The projected in-service date of this project was January Facilities: This project replaced the series capacitor at Malin 500 kv substation to match the ratings of series capacitors on the other COI line segments. B. Studies Studies for this project have indicated that the existing series capacitor on PacifiCorp s Malin to Round Mountain 500 kv line is one of the limiting factors for existing COI rating. C. Impact on Other Systems At present there would be no impacts on other systems. 22

24 XVIII. Parish Gap Substation (June 2010, Completed) PacifiCorp 1. Name: Parish Gap Substation 4. Status: The projected in-service date for this project was June Facilities Construct a new sub approx 1.25 mi north of Marion, OR B. Studies The Parish Gap substation would serve an alternate source for Santiam and Hazelwood. The new substation would provide capacity to accommodate load growth in the Santiam area. C. Impact on Other Systems This project would have no regional impacts 23

25 XIX. County System Upgrade (May 2013) 1. Name: Carbon County Substation 4. Status: The projected in-service date for this project is May Facilities: This project would involve two or more phases and would begin with the installation of a kv transformer substation tied to the Helper-Moab 138 kv line and the Helper-Coal #1 46 kv line. Subsequent phases would include converting the Helper- Coal Creek #1 46 kv line to 138 kv and connecting the line to the new substation and expanding the Helper 138 kv substation. B. Studies Studies have demonstrated the need for additional transmission support on the 46 kv system in Carbon County to address low voltage, thermal overload, and N-1 conditions. C. Impact on Other Systems N/A 24

26 XX. Line 37 Conversion Project (October 2012) PacifiCorp 1. Name: Line 37 Conversion Project 4. Status: The projected in-service date for this project is October Facilities: Construct new kV, 114 MVA Nickel Mtn. Sub. - Riddle and Gazley Capacity. B. Studies This would solve the overloads of the Gazley to Days Creek line and the substation overload at Gazley and strengthen the southern Roseburg system. C. Impact on Other Systems This project would have no regional impacts. 25

27 XXI. Line 3 Conversion Project (November 2013) 1. Name: Line 3 Conversion Project 4. Status: The projected in-service date for this project is November Facilities: Rebuilt Baldy switching station, add three circuit breakers on the ring bus, convert Line3, relocate the 115 to 69 kv transformers to Belknap sub, and install 115 kv breakers at Oak Knoll & Ashland subs. This project requires reconductoring line 19 from Lone Pine to Baldy; (reconductoring completion is expected by the end of 2011) B. Studies An outage to Line 79 (supplying the Foothills and Belknap areas) can no longer be supported from the Ashland 69 kv transformer over Line 3 and it would not be possible to supply 38 MW of load. In order to supply this load if that outage happened line 3 (Belknap Ashland) should get converted to 115 kv. C. Impact on Other Systems This project would have no regional impacts. 26

28 XXII. Sigurd-Three Peaks-Hurricane-St George 345 kv line ( Delayed beyond 2021) 1. Name: Sigurd-Three Peaks-Hurricane-St George 345 kv 4. Status: The projected in-service date for this project is beyond Facilities This project would entail constructing one 345 kv line from Sigurd to St. George via Three Peaks and Hurricane. The project in service date was delayed after technical studies show loads in SW Utah can be reliably served through 2020 with the existing and planned second Sigurd to Red Butte line. B. Studies Technical studies have demonstrated that this line will effectively serve loads in South West Utah. C. Impact on Other Systems This line should not impact other systems outside the PacifiCorp East Control Area. 27

29 XXIII. Terminal 345/138 kv #1 & #2 transformer (Two- 700 MVA) (May 2012) 1. Name: Terminal 345/138 kv #1 & #2 transformer project 4. Status: The projected in-service date for this project is May Transformer would be added to meet projected load growth needs. 6. Facilities Two 345/138 kv transformer (Two 700 MVA) B. Studies Currently under way C. Impact on Other Systems No impact on other systems. 28

30 XXIV. Camp Williams-Terminal 345 kv #1 line loop in to Oquirrh Sub (June 2011) 1. Name: Camp Williams-Terminal 345kV #1 line loop in 4. Status: The projected in-service date for this project is June, Facilities: Loop the Camp William-Terminal 345 kv #1 line into Oquirrh. B. Studies Studies have shown the need for additional transfer capability in the Salt Lake Valley. C. Impact on Other Systems This project is proposed to meet the load growth in the Wasatch Front and would have no regional impacts. 29

31 XXV. White City Substation (May 2013) Remove this project, same as the Whetstone project 1. Name: White City Substation 4. Status: The projected in-service date for this project is May Facilities: Construct new 230 to 115 kv sub to the White City vicinity with a 250 MVA transformer. B. Studies Two Lone Pine kv Transformers will no longer have enough capacity to back each other up at summer peak, and loss of one of them will result in loss of loads. This problem can be resolved by constructing a kv substation in the White City area. C. Impact on Other Systems This project would have no regional impacts. 30

32 XXVI. Copco to Weed Junction Line Conversion (Nov 2017) PacifiCorp 1. Name: Copco to Weed Junction Line #2 Conversion Status: Additional studies are required to determine in service date.. 6. Facilities: Construct and rebuild existing 69 kv transmission line & associated subs to 115 kv. B. Studies Required additional studies. C. Impact on Other Systems This project would have no regional impacts. 31

33 XXVII. Midvalley 345/138 kv #1 & #2 transformer replacement 700 MVA (May 2016) 1. Name: Midvalley 345/138 kv #1 & #2 transformer replacement 4. Status: The projected in-service date for this project is May Facilities: This project would replace existing Midvalley 450 MVA transformers with 700 MVA transformers and a 4 th 345 kv circuit breaker. B. Studies Recent Salt Lake Valley load projections indicate the need to replace the two existing Midvalley 450 MVA transformers based on a Midvalley 345/138 kv transformer N-1 condition or a Terminal 345/138 kv transformers N-2 condition. C. Impact on Other Systems This project would have no regional impacts. 32

34 XXVIII. Union Gap 230/115 kv increase in capacity, add a third 150 MVA transformer (Nov 2013) 1. Name: Union Gap 230/115 kv increase in capacity, add a third 150 MVA transformer.. 4. Status: The projected in-service date for this project is Nov Facilities: Increase capacity at UGS by adding a third 150 MVA transformers. B. Studies This capacity increased is recommended to prevent overload. C. Impact on Other Systems This project would have no regional impacts. 33

35 XXIX. Mt. Shasta Substation, (November 2016) PacifiCorp 1. Name: Mt. Shasta Substation, construct new 115 kv to 12.5 kv sub with new 25 MVA LTC transformer. Construct a 115 to 69 kv sub at Mott switching station. Convert line 2 south to 115 kv between Weed Junct & Mott subs. 4. Status: The projected in-service date for this project is Nov Facilities: Construct new 115 kv to 12.5 kv sub with new 25 MVA LTC transformer. Construct a 115 kv to 69 kv sub at Mott Switching Station. Convert Line 2 south to 115 kv between Weed Junction, & Mott subs. B. Studies The 12.5kV distribution transformer will reach its thermal limit. It is needed to construct new kV substation and transfer all 12.5 kv loads to this new Mt. Shasta substation. C. Impact on Other Systems This project would have no regional impacts. 34

36 XXX. Copco Substation Increase (Dec 2012) 1. Name: Copco Substation, Replace existing 125 MVA 230/115 kv transformer with a 250 MVA 4. Status: The projected in-service date for this project is Dec Facilities: Replace existing 125 MVA kv transformer with a 250 MVA B. Studies This is recommended to prevent loading and restriction issues and low voltage problems on WECC line #14 during an N-1 outage of a single transformer in this area. C. Impact on Other Systems This project will have no regional impacts 35

37 XXXI. Red Butte switch yard capacitor bank (Oct 2011) Remove this project, included in the Red Butte SVS project. 1. Name: Red Butte switch yard capacitor bank, install a 50 MVAr capacitor. 4. Status: The projected in-service date for this project is Oct Facilities: 1-50 MVAr B. Studies Evaluated as part of System Operating Limit (SOL) & path rating studies C. Impact on Other Systems No impact on other systems. 36

38 XXXII. Ben Lomond 345/138 kv #2 transformer 450 MVA (June 2012) 1. Name: Ben Lomond 345/138 kv #2 transformer, a 450 MVA transformer is moved from Terminal substation. 4. Status: The projected in-service date for this project is June Required for local load services. 6. Facilities: B. Studies Currently underway. C. Impact on Other Systems No impacts on other systems 37

39 XXXIII. Whetstone 230/115 kv Substation (Phase 1: May 2012, Phase 2: May 2013) 1. Name: Whetstone 230/115 kv Substation 4. Status: The projected in-service date for this project is Phase 1: May 2012, Phase 2: May Facilities: Construct new 230 to 115 kv in the White City vicinity with a 250 MVA transformer. B. Studies To serve load growth in this area. Two Lone Pine kv transformers will no longer have enough capacity to back each other up at summer peak, and loss of one of them will result in loss of loads. This problem can be resolved by constructing a kv substation in the White City area. C. Impact on Other Systems This project would have no regional impacts. 38

40 XXXIV. Central substation 345/138 kv transformer replacement 450 MVA (May 2014) Cancelled 1. Name: Central substation 345/138 kv, 450 MVA transformer replacement 4. Status: The project is cancelled. 6. Facilities: 345/138 kv, 450 MVA transformer replacement 7. B. Studies Studies for this project are underway. C. Impact on Other Systems None 39

41 XXXV. Pilot Butte 500/230 kv new sub/ new 230/115 kv sub/ convert Bend Redmond 69 kv line Plan of service is being reviewed and this is not a firm date (Sept 2017), Remove this project, this is a BPA project. 1. Name: Pilot Butte 500/230 kv new sub/ new 230/115 kv Sub/ convert Bend Redmond 69 kv line. 4. Status: The projected in-service date for this project is Sept 2017; this in service date is being reviewed and would get updated in a later time. 6. Facilities: Pilot Butte 500/230 kv new sub, new 230/115 kv Sub/ convert Bend Redmond 69 kv line. B. Studies This will avoid N-1 overloading of Pilot Butte kv transformers. C. Impact on Other Systems This project would have no regional impacts. 40

42 XXXVI. Terminal, install 3 rd 345/138 kv (700 MVA) transformer (May 2015) Cancelled 1. Name: Terminal, install 3 rd 345/138 kv (700 MVA) transformer 4. Status: The projected in-service date for this project is May Transformer will be added to meet projected load growth needs. 6. Facilities: Install 3 rd 345/138 kv transformer B. Studies Currently underway. C. Impact on Other Systems None. 41

43 XXXVII. Yellowtail substation, install 2 nd 230/161 kv (100 MVA) transformer ( ) 1. Name: Yellowtail substation, install 2 nd 230/161 kv (100 MVA) transformer. 4. Status: The projected in-service date for this project is May Facilities: 2 nd 230/161 kv (100 MVA) transformer B. Studies Preliminary studies have shown this project is needed to prevent overload of the Yellowtail kv transformer for the loss of the Billings-Yellowtail 230 kv line or the Yellowtail-Yellowtail (WAPA) 230 kv line. C. Impact on Other Systems This project would have no regional impact. 42

44 XXXVIII. Klamath Co Gen kv Transformer (Sept 2018) 1. Name: Klamath Co Gen kv new Transformer 4. Status: The projected in-service date for this project is Sept Facilities: New kv transformer B. Studies: Ongoing C. Impact on Other Systems This project requires coordination at the WECC level and with the Klamath Falls Cogeneration Plant. 43

45 XXXIX. Big Grassy Substation 161 kv, install a 42 MVAr cap bank (May 2018) 1. Name: Big Grassy Substation 161 kv, install a 42 MVAr cap bank. 4. Status: The projected in-service date for this project is May Capacitor would provide voltage support in Eastern Idaho. 6. Facilities: 1-42 MVAr, 161 kv capacitor B. Studies Currently underway. C. Impact on Other Systems Impact on Amps line, supports transfer capability of IPC, NWE, PAC 44

46 XL. Three Mile Knoll, install 2 nd 345/138 kv (700 MVA) transformer (May 2018) 1. Name: Three Mile Knoll, install 2 nd 345/138 kv (700 MVA) transformer 4. Status: The projected in-service date for this project is May Transformer required for local load services. 6. Facilities: Install 2 nd 345/138 kv (700 MVA) transformer B. Studies Currently Underway. C. Impact on Other Systems None. 45

47 XLI. Meridian Substation : Install Two 130 MVAr, 230 kv shunt capacitor banks (June 2011) 1. Name: Meridian 230 kv, install two 230 kv capacitor banks 4. Status: The projected in-service date for this project is June Facilities: MVAr, 230 kv shunt capacitors. B. Studies Studies and approval are complete. Currently construction is underway. C. Impact on Other Systems This shunt capacitor was recently identified as part of the Midpoint Summer Lake (West to East) Phase 2 rating Project and is necessary to achieve a rating of 550 MW on Path 75 for a double outage at the Palo Verde Nuclear Generation Station. 46

48 XLII. St. George 345 kv Substation with 345/138 kv (700 MVA) transformer (2015) 1. Name: St. George substation 345/138 kv (700 MVA) transformer. 4. Status: The projected in-service date for this project is Project required to meet local load service. 6. Facilities: Build St. George 345 kv substation with 345/138 kv (700 MVA) transformer. Energize one Red Butte- St. George circuit at 345 kv. B. Studies Studies for this project are underway. C. Impact on Other Systems None 47

49 XLIII. Gateway South Transmission Project The Gateway South Stage 1 Transmission Project as proposed by PacifiCorp includes a 500 kv transmission line from the proposed Aeolus substation in southeast Wyoming (constructed as part of the Gateway West Project) to the Clover substation in central Utah, and a 345 kv transmission project from the Sigurd substation near Richfield, Utah to the Red Butte substation in southwestern Utah. PacifiCorp is leading the planning effort and managing the WECC rating process for the project. The Gateway South project entered Phase 2 in January Of the transmission paths associated with the project, the Aeolus South path was granted Phase 3 status on December 16, 2010 while the TOT 2B/2C Paths should be granted Phase 3 status in the first quarter of PacifiCorp is proposing this transmission project because of native load growth and the need to deliver renewable resources from Wyoming to PacifiCorp retail load centers. PacifiCorp forecasts that its load on the Wasatch Front of Utah will double in the next 20 years. Additionally, PacifiCorp has an independent obligation, pursuant to its Open Access Transmission Tariff, to plan for and expand its transmission system based upon the needs of its native load and network customers along with eligible customers that agree to expand the transmission system. PacifiCorp initiated the WECC ratings process for the full Energy Gateway scenario, including Stage 1 facilities needed to meet PacifiCorp s long-term regulatory requirement to serve loads, and Stage 2 facilities which were intended to provide extra capacity if commercially supported by equity partners and other third parties. Energy Gateway South Stage 2 facilities consist primarily of a second 500 kv circuit from Aeolus to Clover and an additional 500 kv segment from Clover to the Crystal substation in southern Nevada. To date, the third party financial commitments that are necessary to support the Stage 2 facilities have not materialized. PacifiCorp will pursue WECC ratings for Stage 1 of Energy Gateway South only at this time, and will not further pursue ratings for Stage 2 facilities. Plan of Service An overview of the Gateway South Stage 1transmission system modifications are summarized below and are illustrated in Figure 1. (A complete plan-of-service summary for the Project is included in the Gateway South - Comprehensive Progress Report, distributed in November 2008.) 48

50 Stage 1 Transmission Projects Red Butte 345 kv SVC (-75/+350 MVAr) for voltage control Sigurd-Red Butte 345 kv #2 line (160 miles) Series Compensation on Sigurd-Red Butte 345 kv #2 line at Red Butte (1800/2430 Amps) Clover Substation- Add 345/138 kv transformer #1 (450 MVA) Aeolus Clover 500 kv line #1 (400 miles) Clover 500/345 kv #1 transformer (one MVA) Note: It is anticipated that additional transmission facilities within the NV Energy - Southern Nevada transmission system may be required to support the added transfers on the TOT 2C transmission path. 49

51 Gateway South Single-Line Diagram The following diagrams depict the project and adjacent paths. PacifiCorp Gateway South Single-line Gateway West Aeolus SVC 230 kv to Windstar 230 kv Gateway Central 500 kv to Anticline 500 kv 500 kv construction, Energized at 345 kv 345 kv to Oquirrh/Limber 345 kv to Camp Williams 500 kv to #4 #2 #1 #3 Limber Mona Middle 2 Middle miles 3 - Athabaska/TW Clover #1 #2 500 kv 345 kv Sigurd 500 kv 75 miles 3 - Athabaska/TW kv Red Butte 500 kv 160 miles 3 - Athabaska/TW miles 2 Cardinal 954 ACSR SVC 345 kv Harry Allen 345 kv Crystal New 500 kv 95 miles 3 - Athabaska/TW 230 kv NPC Bus 500 kv MVA +50 PST 500 kv 345 kv 230 kv Figure 1 50

52 Planned Operating Date The Gateway South schedule currently identifies the following in-service dates for key portions of the transmission project: Stage 1 Transmission Projects Dates Red Butte 345 kv SVC (-75/+350 MVAr) May 2011 Loop the Sigurd Mona 345 kv #1 and #2 lines into Clover 345 June 2012 kv substation. Add a 450 MVA, 345/138 kv auto transformer Sigurd-Red Butte 345 kv #2 line June 2014 Series Compensation on Sigurd-Red Butte 345 kv #2 line at Red Butte (1800/2430 Amps) June 2014 Clover Substation- Add 345/138 kv transformer #1 (450 MVA) June 2012 Aeolus Clover 500 kv line # Clover 500/345 kv #1 transformer ( MVA) Clover 500 kv, three-200 MVAr shunt capacitors Transfer Capability The projected transfer capabilities vary along the project, and are detailed in Table 1 Project Section Existing Path Existing Rating (MW) Increase (MW) Aeolus Clover Red Butte- Harry Allen TOT 2C 300/300 (North-South / South-North) 300/280 (North-South /South-North) New Rating (MW) 600/580 (North- South/South- North) Table 1 Gateway South Transmission Segments and Proposed Transfer Levels The Gateway South Transmission Project, the study results will comply with NERC TPL thru TPL Standards as well as WECC TPL - (001 thru 004) WECC- 1- CR-System Performance Criteria. Additionally, PacifiCorp, Idaho Power and NV Energy planning criteria will also be applied. A Gateway South Transmission Project Comprehensive Progress Report (Phase I) was released for comment in November 2008 and Phase II status was requested and granted in February The Aeolus South path was granted Phase 3 on December 16, 2010 while the TOT 2B/2C paths should be granted Phase 3 status in the first Quarter of

53 XLIV. Gateway West Transmission Project (Populus-Windstar) Gateway West is a joint proposal from Idaho Power Company and Rocky Mountain Power (PacifiCorp) to build and operate approximately 1,150 miles of new 230 kilovolt (kv) and 500 kv transmission lines from the planned Windstar substation near Glenrock, Wyoming to the planned Hemingway substation near Melba, Idaho. This project will help supply energy to customers and improve electric system reliability by enabling delivery of electricity from existing and new generating resources, including renewable resources such as wind. PacifiCorp is leading the planning effort and managing the WECC rating process for all project segments from Windstar to Populus. Idaho Power is leading the planning efforts and managing the WECC rating process for all project segments from Populus to Hemmingway. PacifiCorp initiated the WECC ratings process for the full Energy Gateway scenario, including Stage 1 facilities needed to meet PacifiCorp s long-term regulatory requirement to serve loads, and Stage 2 facilities which were intended to provide extra capacity if commercially supported by equity partners and other third parties. Energy Gateway West Stage 2 facilities (between Aeolus & Populus) consist primarily of a second 500 kv circuit from Aeolus to Populus. To date, the third party financial commitments necessary to support the Stage 2 facilities have not materialized. PacifiCorp will pursue WECC ratings for Stage 1 of Energy Gateway West (East of Populus) only at this time, and will not further pursue ratings for Stage 2 facilities. Plan of Service An overview of the Gateway West Stage 1 transmission system modification (east of Populus) is summarized below and is illustrated in Figure 2. Stage 1 Transmission Projects Windstar 230 kv, two-150 MVAr shunt capacitors Windstar- Aeolus 230 kv #1 line (76 miles) Windstar Aeolus 230 kv #2 line (76 miles) Aeolus-Anticline/Bridger 500 kv #1 line (154 miles) Anticline/Bridger-Populus 500 kv #1 line (203 miles) Aeolus 500/230 kv transformer #1,#2 & #3 (three 1650 MVA) Aeolus 230 kv SVC (-125/+450 MVAr), MSCs one- 50 MVAr (230 kv), three 100 MVAr (230 kv), four -200 MVAr (500kV) shunt capacitors. Anticline 500/345 kv #1 transformer (1500 MVA) Anticline 345 kv PST #1 & #2 (two-750 MVA) Populus 500/345 kv transformer #1 ( 2000 MVA) Populus 500 kv, three-200 MVAr shunt capacitors 52

54 Gateway West Single-Line Diagram The following diagrams depict the project and adjacent paths. 500 kv to Populus MVA O +20 PST Anticline 345 kv to Populus 345 kv MVA 500 kv 145 miles 3 - Athabaska/TW kv to Three Mile Knoll 145 miles 3 - Athabaska/TW kv 230 kv to Atlantic City MVA 230 kv to Rock Springs Bridger Gateway West (Bridger - Aeolus - Windstar) 230 kv to Point of Rocks 230 kv to Mustang Aeolus SVC 73 miles ACSR 76 miles ACSR Windstar 230 kv MVA 230 kv to Pumpkin Butte 230 kv to Casper 230 kv Stinking Creek 27 miles Rebuilt ACSR 230 kv to Yellow Cake Dave Johnston 44 miles Rebuilt ACSR 500 kv 500 kv to Clover 500 kv 345 kv 230 kv Gateway South Figure 2 53

55 Planned Operating Date The Gateway West schedule currently identifies the following in-service dates for key portions of the transmission project: Transmission Projects Dates Windstar 230 kv, two-150 MVAr shunt capacitors Windstar- Aeolus 230 kv #1 line (76 miles) Windstar Aeolus 230 kv #2 line (76 miles) Aeolus-Anticline/Bridger 500 kv line#1 (154 miles) Anticline/Bridger-Populus 500 kv line#1 (203 miles) Aeolus 500/230 kv transformer #1,#2 & #3 (three MVA) Aeolus 230 kv SVC (-125/+450 MVAr), MSCs one- 50 MVAr ( kv), three- 100 MVAr (230 kv), four-200 MVAr (500kV) shunt capacitors Anticline 500/345 kv #1 transformer (1500 MVA) Anticline 345 kv PST #1 & #2 (two-750 MVA) Populus 500/345 kv transformer #1 ( 2000 MVA) Populus 500 kv, three-200 MVAr shunt capacitors

56 Transfer Capability The transfer capabilities vary along the project, and are detailed in Table 2 Study Area Path Proposed Rating Stage I Windstar TOT 4A (Path 37) 2175 MW (North to South) Bridger Bridger/Anticline West 4100 MW (Path 19) (East to West) Bridger Path C (Path 20) 2250 MW Bi-Directional (North to South) Bridger Aeolus West 2670 MW (East to West) Simultaneous Interaction No Interaction Aeolus South Path C (Path 20) Bonanza West (Path 33) Monument-Naughton Rock Springs/Firehole West Montana-Idaho (Path 18) Bridger West (Path 19) Bonanza West (Path 33) Aeolus South TOT 1A Bonanza West (Path 33) Table 2 55

57 XLV. Gateway Central Transmission Project Populus to Terminal PacifiCorp Extending from southeast Idaho into northern Utah, the Populus to Terminal transmission line adds a new double-circuit, 345-kilovolt transmission line stretching approximately 135 miles from the Populus Substation built near Downey, Idaho, to the Terminal substation near the Salt Lake City airport. The Populus to Terminal project was placed in service November 19, Mona to Oquirrh PacifiCorp is committed to providing safe, reliable, cost-effective power and has proposed a project to establish a new high-voltage transmission line and two new substations in Utah. The line will originate at the Clover substation to be built near the existing Mona substation in Juab County, and run north to the Limber substation to be built in Tooele County. The line will continue from Limber and connect to the Oquirrh Substation in West Jordan. As part of the company's long-range planning, this project also includes the identification of a corridor for a future high-voltage transmission line. This project will traverse the areas around the communities of Cedar Fort, Eureka, Grantsville, Mona, Salt Lake City, South Jordan, Stockton, Tooele and West Jordan. The in-service date for this line is Oquirrh to Terminal The line will be located in an existing high-voltage transmission line corridor. It will run from the Oquirrh substation near South and 5600 West in West Jordan, north to the Terminal substation, located due south of the Salt Lake City international airport. This section of new transmission will link together other new transmission sections Mona to Oquirrh and Populus to Terminal to complete the Gateway Central portion of the Energy Gateway Transmission Expansion Project. The in-service date for this line is

58 Plan of Service An overview of the Gateway Central transmission system modification is summarized below. Transmission Projects Populus- Terminal double circuit 345 kv (135 miles) Mona- Limber single circuit 500 kv energized at 345 kv (65 miles) Limber- Oquirrh double circuit 345 kv (32 miles) Oquirrh Terminal double circuit 345 kv (14 miles) Ben Lomond 345/138 kv #2 transformer (450 MVA) Planned Operating Date The Gateway Central schedule currently identifies the following in-service dates for key portions of the transmission project: Transmission Projects Populus- Terminal double circuit 345 kv (135 miles) Dates In-Service November 19, 2010 June 2013 Mona- Limber single circuit 500 kv energized at 345 kv (65 miles) Limber- Oquirrh double circuit 345 kv (32 miles) June 2013 Oquirrh Terminal double circuit 345 kv (14 miles) 2014 Transfer Capability The transfer capabilities vary along the project, and are detailed in Table 3 Path C Existing 2010(Populus- Terminal) (Gateway) North to South 1000 MW 1600 MW 2250 MW South to North 1000 MW 1250 MW 2250 MW Table 3 57

59 XLVI. Future Generation Projects Project Name Location Participants One- Line Diagram Status (In service) Generation Capacity Type Transmission Facilities Studies Planned Generation West Solar OR PacifiCorp TBD MW Solar TBD TBD Solar OR PacifiCorp TBD MW Solar TBD TBD Solar OR PacifiCorp TBD MW Solar TBD TBD Jim Bridger Wyoming PacifiCorp TBD Thermal MW Upgrade TBD TBD Solar OR PacifiCorp TBD MW Solar TBD TBD Solar OR PacifiCorp TBD MW Solar TBD TBD Jim Bridger Wyoming PacifiCorp TBD MW Thermal Upgrade TBD TBD 58

60 Project Name Location Participants One- Line Diagram Status (In service) Planned Generation East Generation Capacity Type Transmission Facilities Studies Kemmerer, Wind Glenrock Wind Wy PacifiCorp TBD MW Turbine TBD Underway Mc Fadden Ridge East/WY PacifiCorp TBD Wind MW Turbine TBD Underway Three Butes Wind Wyoming PacifiCorp TBD Wind MW Turbine TBD Underway Wind Casper Wind Wyoming PacifiCorp TBD MW Turbine TBD Underway High Plains Wind Wyoming PacifiCorp TBD Wind MW Turbine TBD Underway Castle Dale, Thermal Hunter UT PacifiCorp TBD MW Upgrade TBD Underway Dunlap Wyoming PacifiCorp TBD MW Wind TBD Underway Top of the World Wyoming PacifiCorp TBD MW Wind TBD Underway Huntington, Thermal Huntington UT PacifiCorp TBD MW Upgrade TBD Underway Castle Dale, Thermal Hunter UT PacifiCorp TBD MW Upgrade TBD Underway Castle Dale, Thermal Hunter UT PacifiCorp TBD MW Upgrade TBD Underway CCCT F 2*1 w/df (Lake Thermal side 2 in 2009) Vineyard, UT PacifiCorp TBD MW Upgrade TBD Underway Huntington Huntington, UT PacifiCorp TBD MW Thermal Upgrade TBD Underway 59

61 CCCT F 2*1 w/df (Current Creek in 2009) Vineyard, UT PacifiCorp TBD MW Status One-Line (In Project Name Location Participants Diagram service) Generation Capacity Thermal Upgrade TBD Underway Type Transmissio n Facilities Studies Planned Generation East Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYSW, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYSW, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYNE, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway Wind, WYSW, 35 Wyoming PacifiCorp TBD MW Wind TBD Underway 60