Date: March 15, Mr. Enoch Davies WECC Technical Staff 155 North 400 West, Suite 200 Salt Lake City, Utah

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1 TRANSMISSION PLANNING Craig Quist Director of Area/Transmission Planning East PacifiCorp 1407 West North Temple, Suite 275 Salt Lake City, Utah (801) PH (801) FAX Date: March 15, 2013 To: Mr. David Franklin, Chairman WECC Technical Studies Subcommittee Southern California Edison 1 Innovation Way Pomona, CA Mr. Enoch Davies WECC Technical Staff 155 North 400 West, Suite 200 Salt Lake City, Utah Subject: PacifiCorp Updated Dear: David and Enoch, In accordance with reporting guidelines by the WECC Planning Coordinating Committee (PCC), please find attached PacifiCorp s on significant additions and changes to our system. Should you have any questions, or need additional information, please contact me at (801) Sincerely, Craig Quist Craig Quist TSS Member, PacifiCorp cc: TSS Members WECC Staff Rick Vail JD Podlesnik

2 Table of Contents A. Planned Transmission and Generation Projects 1 I. Black Rock 230/69 kv Substation (2013)...2 II. Carbon Plant Decommissioning (2015)...3 III. Grants Pass 500/230kV Substation (2019)...4 IV. Huntington- Mona/ 345 kv Line Series Reactor at Mona/Clover (2015)...5 V. Klamath Falls 500/230kV Substation (2016)...6 VI. Lakeside II Transmission Network Upgrades (2014)...7 VII. Midpoint-Summer Lake 500 kv Line - Increase West to East Rating to 550 MW (In service April 2012)...8 VIII. Pinto #3 Phase Shifting Transformer Addition (2015)...9 IX. Sigurd-Three Peaks-Hurricane-St. George 345 kv Line (delayed beyond 2022)...10 X. Standpipe 230 kv Synchronous Condenser (2014)...11 XI. TOT4A Voltage Support Project (June 2008 to December 2014)...12 XII. Vantage-Pomona Heights 230 kv Line (December 2015)...14 XIII. Wallula to McNary 230 kv (#2) Transmission Line (December 2017)...15 XIV. Gateway West Transmission Project...16 XV. Gateway South Transmission Project...23 XVI. Gateway Central Transmission Project...28 XVII. Future Generation Projects...30 B. Waiver of Significant Transmission Project Status 32 Table 7: Planned Transmission Projects (Waiver)...32 Table 8a: Planned Generation Interconnection Projects (PACE) Waiver...35 Table 8b: Planned Generation Interconnection Projects (PACW)- Waiver...39 C. Updates to the Annual Progress Report from the Previous Submittal (2012) 41

3 PacifiCorp to WECC This annual progress report submission is divided into three separate sections, including a summary of all BES transmission projects 1 and generation in Section A; a request for Waiver of Significant Project Status in Section B; and updates to the annual progress report from the previous submittal (2012) in Section C 2. A. Planned Transmission and Generation Projects This annual progress report is intended to 1) capture all BES transmission and generation projects that may have a significant impact on the reliability of the Western Interconnection; and 2) to inform neighboring systems in a timely manner regarding new facility additions to your system and associated system operation. Technical studies have demonstrated that all existing facilities and planned facility additions, as well as associated operating procedures, are in conformance with NERC Planning Standards and WECC System Performance Regional Business Practice. The following projects are included in this Annual Progress Report: All major new and upgraded BES transmission facilities. Such projects include, but are not limited to, new transmission facilities, transmission redesigns or upgrades, permanent removal of existing transmission facilities, or other changes (e.g., operating procedures) that may significantly alter the operation of the transmission facilities Any facilities not covered under the BES transmission definition that may have a significant impact on the reliability of the Western Interconnection All generation projects (200 MW or greater) connected to the transmission system through step-up transformers. Such projects include, but are not limited to, new generation plants, generation repower or upgrades that may significantly alter the operation of the generation facilities 1 BES projects will be determined based on the definition that will be in effect as of July 1, This last section is intended to be a guide for comparing back-to-back Annual Progress Report submissions. 1

4 I. Black Rock 230/69 kv Substation (2013) A. Project Description Name: Participants: One-Line Diagram: Black Rock 230/69 kv Substation PacifiCorp Status: The projected in-service date is November 1, 2013 Generation: Facilities: This project consists of looping in and out of Pavant-Gonder 230 kv line and the Delta-Graymont 69 kv line and installing a 75 MVA -230/69 kv transformer at Delta. B. Studies A five-year study was performed in the area and addressed contracted loads. C. Impact on Other Systems This substation connects to the Pavant-Gonder 230 kv tie line operated by NV Energy. 2

5 II. Carbon Plant Decommissioning (2015) A. Project Description Name: Participants: One-Line Diagrams: Carbon Plant Decommissioning PacifiCorp Status: The projected decommissioning date is April 15, 2015 Generation: Facilities: Carbon Plant The Carbon Plant decommissioning will require the addition of the following facilities: -15/+85 MVAR 138 kv static VAr system (SVS), two 138 kv 15 MVAR capacitor banks with associated breakers at the Mathington substation. The addition of a phase shifting transformer (PST) at the Upalco substation. Relocation of the Spanish Fork 138 kv series line reactors to the Upalco substation. B. Studies Ongoing. C. Impact on Other Systems The Carbon decommissioning has been prompted by EPA regulation changes, and as such the removal of a coal-fired power plant is projected to benefit the environment as a whole. The combined decommissioning and area reinforcement projects will not degrade the central Utah transmission system. 3

6 III. Grants Pass 500/230kV Substation (2019) A. Project Description Name: Participants: One-Line Diagram: Grants Pass 500/230kV Substation PacifiCorp Status: The projected in-service date for this project is 2019 Generation: Facilities: New 500/230 kv Substation tapping PacifiCorp s Meridian to Dixonville 500 kv Line. The 230 kv Line construction will include looping the existing Grants Pass to Meridian 230 kv line into the new substation as well as constructing a new 230 kv transmission line for the new substation to the existing Grants Pass 230 kv Substation B. Studies Studies are ongoing. Preliminary studies show system deficiencies for loss of one of the existing 500/230 kv transformers at Meridian Substation. The preliminary studies also show system impacts for loss of the existing 230 kv line from Meridian to Grants Pass. C. Impact on Other Systems This project requires coordination at the WECC level. The WECC project review process will begin in

7 IV. Huntington- Mona/ 345 kv Line Series Reactor at Mona/Clover (2015) A. Project Description Name: Participants: One-Line Diagram: Huntington- Mona/345 kv Line Series Reactor at Mona/Clover PacifiCorp Status: The projected in-service date for this project is 2015 Generation: Facilities: Install a 18 ohm series reactor in the Mona- Huntington 345 kv line to increase transfer capability across the North of Sigurd/Huntington transmission path. B. Studies A study was conducted to determine the optimum reactor size. It was determined that an 18 ohm series reactor provided the most optionality in future resource location (Huntington vs. Sigurd), while increasing the North of Huntington/Sigurd flow limits. C. Impact on Other Systems This project will support an increase in south to north transfers from southern to northern Utah. 5

8 V. Klamath Falls 500/230kV Substation (2016) A. Project Description Name: Participants: One-Line Diagram: Klamath Falls 500/230kV substation PacifiCorp Status: The projected in-service date for this project is 2016 Generation: Facilities: New 500/230kV substation tapping PacifiCorp s Captain Jack to Klamath CoGen 500 kv line. The 230kV line construction will include looping the existing Klamath Falls to Malin 230kV line into the new substation. B. Studies Studies are ongoing. Preliminary studies show system impacts for loss of the existing Malin 500/230 kv transformer starting in the 2018 period. C. Impact on Other Systems This project requires coordination at the WECC level. WECC project review process to start in

9 VI. Lakeside II Transmission Network Upgrades (2014) A. Project Description Name: Participants: One-Line Diagram: Lakeside II Transmission Network Upgrades PacifiCorp Status: The projected in-service date is 06/01/2014 Generation: Facilities: Lakeside generating facility Transmission of energy from the generation facility to beyond Steel Mill substation requires the installation of two new 345kV breakers and looping in of the Camp Williams Emery 345kV line at Spanish Fork substation. Also required is a reconductoring of the 10 mile Spanish Fork Tanner 138kV line and communication fiber to Hale substation B. Studies Technical studies have been performed to evaluate adding the Lake Side II Generation. Defined system improvements were identified as part of the studies. C. Impact on Other Systems Transmission improvement should have minimal inputs on the Western Interconnection. 7

10 VII. Midpoint-Summer Lake 500 kv Line - Increase West to East Rating to 550 MW (In service April 2012) A. Project Description Name: Participants: One-Line Diagram: Midpoint-Summer Lake 500 kv line-increase West to East Rating to 550 MW PacifiCorp Existing line Status: Project completed/in-service: April 1, 2012 Generation: Facilities: B. Studies Spring operating studies have been completed and reviewed by NOPSG. C. Impact on Other Systems Study results indicate that interactions exist between the Midpoint-Summer Lake 500 kv line, the NW-Idaho path and the COI path. 8

11 VIII. Pinto #3 Phase Shifting Transformer Addition (2015) A. Project Description Name: Participants: One-Line Diagram: Pinto #3 Phase Shifting Transformer Addition PacifiCorp Status: The projected in-service date for this project is 2015 Generation: Facilities: Install the (#3) 345 kv /400 MVA, phase shifting transformer in parallel with the two existing phase shifting transformer in a new bay at the Pinto substation. B. Studies Studies have shown that the Pinto phase shifters are the limiting element for the TOT2B1 transmission path rating, phase shifting capacity must be increased in order to meet network obligations. C. Impact on Other Systems Addition of a third PST at Pinto will ultimately result in an increase in the TOT2B1 transmission path rating, which has an interaction with other TOT2 paths (TOT2A, TOT2C and Path 27-IPP DC Line). Ultimately, path rating studies will be performed to fully define this interaction. 9

12 IX. Sigurd-Three Peaks-Hurricane-St. George 345 kv Line (delayed beyond 2022) A. Project Description Name: Participants: One-Line Diagram: Sigurd-Three Peaks-Hurricane-St. George 345kV PacifiCorp Status: The projected in-service date for this project is beyond 2022 Generation: 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 demonstrated that loads in SW Utah can be reliably served through 2025 with the existing line and planned second Sigurd to Red Butte #2 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 could affect the southern Utah and southern Nevada transmission paths. 10

13 X. Standpipe 230 kv Synchronous Condenser (2014) A. Project Description Name: Participants: One-Line Diagram: Standpipe 230kV Synchronous Condenser PacifiCorp Status: The projected in-service date for this project is 12/31/2014 Generation: Facilities: Synchronous Condenser Construct a new Standpipe 230 kv substation to be located near Miners substation and will result in the Platte- Standpipe- Freezeout 230kV line. The Treasureton 75 MVAr synchronous condenser will be relocated to Standpipe. B. Studies The 2012 TOT4A Path Rating Study included a sensitivity with the Standpipe reactive device. The results were shared with other utilities. C. Impact on Other Systems As these facilities are required for central Wyoming voltage support, no other paths are affected. 11

14 XI. TOT4A Voltage Support Project (June 2008 to December 2014) A. Project Description Name: Participants: One-Line Diagram: Status: Generation: Facilities: TOT4A Voltage Support Project PacifiCorp (Sponsor) 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. The following facilities have been identified for Wyoming voltage support: Atlantic City 230 kv, 15 MVAr Capacitor (In-service: October 2010) Riverton 230 kv, 30 MVAr Capacitor (In-service: August 2010) Midwest 230 kv, 30 MVAr Capacitor (In-service: October 2010) Dynamic voltage control in the Miners Area has been superseded by Standpipe 230 KV Synchronous Condenser project-projected in-service date for 12/31/2014) [see Section X] B. Studies Wyoming 2010 transfer capability studies, which evaluated the impacts of projected Wyoming load growth (both projected and large customer) on the TOT4A 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 12

15 Technical studies have indicated that based on projected load growth, the reactive support is needed to maintain the TOT4A/4B Nomogram at its current transfer levels. As these facilities are required for central Wyoming voltage support, no other paths are affected. 13

16 XII. Vantage-Pomona Heights 230 kv Line (December 2015) A. Project Description Name: Participants: One-Line Diagram: Status: Generation: Facilities: Vantage to Pomona Heights 230 kv line PacifiCorp This project is in the process of obtaining the necessary permits for construction. The projected in-service date is December 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 - Wanapum 230 kv transmission line, impacts are evident in the Yakima/Mid C area. This project mitigates these problems. C. Impact on Other Systems This project is needed as reinforcement to the area transmission system and relieves system problems to the MIDC transmission owners, most notably BPA. 14

17 XIII. Wallula to McNary 230 kv (#2) Transmission Line (December 2017) A. Project Description Name: Participants: One-Line Diagram: Status: Generation: Facilities: Wallula to McNary 230 kv (#2) Transmission Line PacifiCorp (Sponsor) This project is in Phase 2 of the WECC Three Phase Rating Process. The project has a planned in service date of December The Wallula to McNary 230 kv #2 line would be a single circuit transmission line with line terminals at Wallula and McNary substations. B. Studies Phase 2 studies are being performed; when complete they will be reviewed by the project review group. C. Impact on Other Systems This project has impacts to other regional facilities most notably BPA as the project has a terminal at BPA s McNary Substation. Phase 2 studies are being performed and when complete will be reviewed by the project review group. 15

18 XIV. Gateway West Transmission Project Idaho Power and PacifiCorp (Rocky Mountain Power) jointly announced the Gateway West project in May 2007, to build and operate approximately 900 miles of new high-voltage transmission lines between the Windstar substation near Glenrock, Wyoming and the Hemingway substation near Melba, Idaho. After completing Regional Planning and initial path rating studies, on February 6, 2009, Idaho Power was granted Phase 2 path rating status for the Gateway West Transmission Project, which included Stage 1 facilities needed to meet Idaho Power s and PacifiCorp s long-term regulatory requirement to serve loads, and Stage 2 facilities which were intended to provide extra transmission system capacity if commercially supported by other third parties requestors. The Gateway West Stage 1 project will include approximately 150 miles of 230 kilovolt (kv) lines in Wyoming and approximately 800 miles of 500 kv lines in Wyoming and Idaho. Gateway West Stage 2 transmission facilities primarily consist of a second set of 500 kv circuits from southern Wyoming to western Idaho. At the March 30, 2010, Gateway West and Gateway South combined project review meeting participants approved the Gateway Phase 2 Study Plan and agreed that Gateway transmission segments could be grouped into two logical project stages [1 and 2], which would be evaluated separately by WECC Phase 2 study group (or sub groups). Additionally, it was agreed that incremental transmission limitations for transmission segments that are added between stages, will be addressed via SOL (System Operating Limit) studies. [This same process was previously followed and successfully demonstrated by BPA and Avista for the West of Hatwai Expansion project.] PacifiCorp reported in the 2011 Annual Progress Report submission that the third party requests and financial commitments that are necessary to support the Energy Gateway Stage 2 facilities have not materialized. Therefore, PacifiCorp indicated that it would continue to pursue WECC path ratings for Stage 1 of Energy Gateway only at that time, and will not further pursue ratings for Stage 2 facilities. This Energy Gateway Project status update was also reported to TSS at the April 20-22, 2011, meeting in Westminster, Co. For Gateway West Stage 1 transmission paths located west of Populus [specifically Borah West and Midpoint West], Idaho Power was the project sponsor for each of the path ratings studied; additionally for Gateway West transmission paths located east of Populus [specifically TOT 4A, Aeolus West, Path C and Bridger/Anticline West], PacifiCorp was the project sponsor for the path ratings studied. At the completion of the Phase 2 path rating process, TOT 4A transmission path was granted Phase 3 status on December 13, 2010; Aeolus West, Bridger/Anticline West and Path C transmission paths were granted Phase 3 status on January 5, 2011; and Borah West and Midpoint West transmission paths were granted Phase 3 status on July 21, Both the Gateway West and Gateway South siting and permitting requirements are currently being reviewed separately under the National Environmental Policy Act (NEPA) process. Future 16

19 changes to the Energy Gateway Project facilities and configuration may be influenced by the NEPA process and permitting requirements until this process concludes, which today expected to conclude for Gateway West in 2013 and for Gateway South in At the conclusion of the NEPA process, specific path rating performance issues relative to any necessary changes in Energy Gateway Project facilities and configuration will be addressed with affected Project Review Groups rather than approach the group with piece wise changes, at the time each change becomes known throughout the NEPA process. Based on the agreement between PacifiCorp and Idaho Power, executed in early 2012, PacifiCorp will assume responsibility for sponsoring all Gateway West transmission facilities through the NEPA process and through the project construction agreement phase. Gateway West Stage 1 Plan of Service and Planned Operating Date An overview of the Gateway West Stage 1 transmission system modification and in-service dates are summarized in Table 1 below and illustrated in Figures 1 and 2. Table 1: Gateway West Stage 1 Facilities and In-Service Dates Gateway West Stage 1 Transmission Project Facilities Date TOT 4A (Path 37) Construction of one new 230 kv circuit from Windstar to Aeolus (76 miles) [PAC owned facility] Rebuild the DJ-Difficulty-Shirley Basin-Aeolus 230 kv line from ACSR/phase to a higher rated conductor. [PAC owned facility] Aeolus West Addition of three 500/230 kv (1650 MVA) autotransformers (9 x 1Φ) at Aeolus [PAC owned facility] Aeolus 230 kv SVC (-150/+300 MVAr), one-150 MVAr (230 kv MSC), one- 50 MVAr (230 kv), three 100 MVAr (230 kv), four MVAr (500 kv) shunt capacitors. [PAC owned facility] Construction of one new 500 kv circuit from Aeolus to Anticline with 50% of series compensation (154 miles) [PAC owned facility] Addition of a generator tripping scheme at Aeolus and Windstar [PAC owned facility] Bridger/Anticline West (Path 19) Addition of one - 500/345 kv (1500 MVA) auto transformer (3 x 1Φ) at Anticline [PAC owned facility]

20 Addition of two 345 kv (750 MVA) phase-shifting transformers at Anticline [PAC owned facility] Construction of one new 500 kv circuit from Anticline to Populus with 50% of series compensation (203 miles) [PAC owned facility] Addition of one - 500/345 kv ( 2000 MVA) autotransformer (3 x 1Φ) at Populus [PAC owned facility] Borah [/Populus] West (Path 17) Construction of one new 500 kv circuit from Populus to Borah (55 miles) and new 500 kv circuit between Borah and Midpoint (88 miles). These line sections will be built by conversion of the operating voltage of the existing Kinport/Borah to Midpoint 345 kv line section to 500 kv [IPC owned facility], and the addition of a new 500 kv circuit between Populus and Borah [PAC owned facility]. A 500/345 kv (1500 MVA) autotransformer (3 x 1Φ) will be installed at Borah. Construction of one new 500 kv circuit from Populus to Cedar Hill with approximately 45% series compensation. (118 miles) [PAC owned facility] Construction of one new 500 kv circuit from Cedar Hill to Hemingway with approximately 45% series compensation. (161 miles) [PAC/IPC jointly owned facility] Construction of one new 500 kv circuit from Cedar Hill to Midpoint. This line will connect the Idaho southern route to Midpoint for improved reliability. (34 miles) [PAC/IPC jointly owned facility] This facility has been advanced from Gateway West Stage 2 Midpoint West Midpoint Hemingway Section This section of the project will include two-500 kv circuits: The first 500 kv circuit from Midpoint to Hemingway will be developed by interconnecting the existing Midpoint Summer Lake 500 kv line into the Hemingway Station. [PAC owned facility] Construction of the second 500 kv circuit from Midpoint to Hemingway with approximately 50% series compensation. (126 miles) ) [PAC/IPC jointly owned facility] In-Service July

21 This facility has been advanced from Gateway West Stage

22 Gateway West Single-Line Diagrams The following diagrams depict the project and adjacent transmission paths. Figure 1: Gateway West Stage 1 (West of Bridger/Anticline) Gateway West (Hemingway - Bridger/Anticline) 500 kv to Boardman Hemingway Midpoint 500 kv to Garrison (MISTI) 500 kv to Summer Lake 500 kv to Captain Jack Existing MP-SL 88 miles Skylark Kinport Borah 345 kv Goshen Three Mile Knoll MVA 500 kv Cedar Hills Populus 500 kv to Robison Summit (Northern SWIP) MVA 230 kv Bridger MVA 230 kv to Aeolus/Creston 500 kv to Aeolus 500 kv 345 kv 230 kv 345 kv to Terminal 345 kv to Ben Lomond Gateway Central 230 kv to Point of Rocks 230 kv to Rock Springs 230 kv to Mustang Anticline 500 kv MVA 345 kv MVA O +20 PST 20

23 Figure 2: Gateway West Stage 1 (East of Bridger/Anticline) 345 kv to Populus Bridger 345 kv to Three Mile Knoll 230 kv 230 kv to 230 kv to Rock Springs Mustang 230 kv to Point of Rocks 500 kv to Populus 500 kv 345 kv Anticline MVA MVA O +20 PST Gateway West (Bridger - Aeolus - Windstar) Windstar 230 kv to Pumpkin Butte 230 kv to Casper 230 kv 230 kv to Yellow Cake Dave Johnston 44 miles Rebuilt Heward Aeolus SVC 230 kv MVA 27 miles Rebuilt 500 kv 500 kv to Clover 500 kv 345 kv 230 kv Gateway South 21

24 Transfer Capability The transfer capabilities vary for different portions of the Gateway West project, and are detailed in Table 2: Table 2: Gateway West Stage 1 Transmission Segments and Transfer Levels Path Existing Rating (MW) New Rating (MW) Simultaneous Interaction TOT 4A (Path 37) 937 (North to South) 2175 (North to South) No Interaction Bridger/Anticline West (Path 19) Aeolus South (East to West) (East to West) Path C (Path 20) Bonanza West (Path 33) Monument-Naughton Rock Springs/Firehole West Path C (Path 20) 1600/1250 (North- South/ South- North) 2250 Bi-Directional Montana-Idaho (Path 18) Bridger West (Path 19) Bonanza West (Path 33) Aeolus West 2670 (East to West) Aeolus South TOT 1A (Path 30) Bonanza West (Path 33) Borah West (Path 17) 2557 (East-West) 4450 (East-West) No Interaction Midpoint West 2487 (East-West) 4400 (East-West) No Interaction For the Gateway West Transmission Project, all study results comply with NERC TPL thru TPL Standards as well as WECC TPL - (001 thru 004) WECC-CRT- 2-System Performance Criterion. Additionally, PacifiCorp, Idaho Power and NV Energy planning criteria were applied. Technical studies demonstrated that the transmission path ratings noted in Table 2 are independent of other established path ratings, with the exception of the simultaneous interactions noted. 22

25 XV. Gateway South Transmission Project As part of Energy Gateway Transmission Expansion, PacifiCorp (Rocky Mountain Power) is planning to build a new high-voltage transmission line, known as Gateway South, extending approximately 400 miles from the Aeolus substation in southeastern Wyoming into the new Clover substation near Mona, Utah and 160 miles from Sigurd to Red Butte. After completing Regional Planning and initial path rating studies, on February 6, 2009, PacifiCorp was granted Phase 2 path rating status for the Gateway South Transmission Project, which included 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. The Gateway South Stage 1 transmission facilities include 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 second 345 kv transmission line from the Sigurd substation near Richfield, Utah to the Red Butte substation near Central, Utah in southwestern Utah. Gateway South Stage 2 transmission facilities primarily consist of a second 500 kv circuit from Aeolus substation to Clover substation and a 500 kv segment from Clover substation to the Crystal substation in southern Nevada. At the March 30, 2010, Gateway West and Gateway South combined project review meeting participants approved the Gateway Phase 2 Study Plan and greed that Gateway transmission segments could be grouped into two logical project stages [1 and 2], which would be evaluated separately by WECC Phase 2 study group (or sub groups). Additionally, it was agreed that incremental transmission limitations for transmission segments that are added between stages, will be addressed via SOL (System Operating Limit) studies. PacifiCorp reported the 2011 Annual Progress Report submission that the third party financial commitments that are necessary to support the Energy Gateway Stage 2 facilities have not materialized. Therefore, PacifiCorp indicated that it would continue to pursue WECC path ratings for Stage 1 of Energy Gateway only at that time, and will not further pursue ratings for Stage 2 facilities. This Energy Gateway Project status update was also reported to TSS at the April 20-22, 2011, meeting in Westminster, Co. For the transmission paths associated with Gateway South Stage 1, specifically Aeolus South and TOT 2B/2C, PacifiCorp was the project sponsor for each of the path ratings studied. At the completion of the Phase 2 path rating process, Aeolus South transmission path was granted Phase 3 status on December 16, 2010, while the TOT 2B/2C transmission paths was granted Phase 3 status on June 21, Both the Gateway West and Gateway South siting and permitting requirements are currently being reviewed separately under the National Environmental Policy Act (NEPA) process. Future changes to the Energy Gateway Project facilities and configuration may be influenced by the NEPA process and permitting requirements until this process concludes, which today expected to conclude for Gateway West in 2013 and for Gateway South in As part of this process, on October 7, 2012 the BLM and Forest Service signed the Record of Decision (ROD) providing an easement for the Sigurd-Red Butte project. At the conclusion of the NEPA process, specific path rating performance issues relative to any necessary changes in Energy Gateway Project facilities and configuration will be addressed with affected Project 23

26 Review Groups rather than approach the group with piece wise changes, at the time each change becomes known throughout the NEPA process. 24

27 Plan of Service and Planned Operating Date An overview of the Gateway South Stage 1 transmission system modifications and in-service dates are summarized in Table 3 and are illustrated in Figure 3. Table 3: Gateway South Stage 1 Facilities and In-Service Dates Gateway South - Stage 1 Transmission Project Facilities TOT 2B1 (Path 78) Addition of 60% series compensation on the 345 kv line between Huntington and Pinto, at Pinto [PAC owned facility] TOT 2C (Path 35) Construction of Red Butte 345 kv SVC (-75/+350 MVAr) for southwest Utah voltage control [PAC owned facility] Addition of the Harry Allen 345/230 kv #3 (375 MVA) transformer [NVE owned facility] Upgrade the series compensation on the 345 kv line between Three Peaks and Sigurd, at Three Peaks, to 1800/2160 Amps (Normal/Emergency) [PAC owned facility] Construction of one new 345 kv circuit from Sigurd to Red Butte with 46% series compensation. (170 miles) [PAC owned facility] Modification of the Huntington RAS scheme to address transmission outages south of Red Butte. [PAC owned facility] Aeolus South Loop-in both 345 kv circuits between Mona and Sigurd into Clover and add one - 345/138 kv ( MVA) autotransformer at Clover [PAC owned facility] Construction of one new 500 kv circuit from Aeolus to Clover with 50% series compensation (400 miles) and add one - 500/345 kv (2000 MVA) autotransformer (3 x 1Φ) at Clover [PAC owned facility] Loop-in the 345 kv circuit between Huntington and Mona into Clover. [PAC owned facility] Dates In-Service, March 2011 In-Service, May 16, 2011 June 17, 2011 June 2013 June 2015 June 2015 Dec

28 Figure 3: Gateway South Stage 1 Single-Line Diagram The following diagrams depict the project and adjacent transmission paths. 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 Mona 345 kv to Camp Williams #4 #2 #1 #3 Middle 2 Middle 1 Clover #1 500 kv 345 kv Sigurd 345 kv Red Butte 345 kv to Huntington SVC 345 kv Harry Allen 345 kv 230 kv 500 kv 345 kv 230 kv 26

29 Transfer Capability The transfer capabilities vary for different portions of the Gateway South project, and are detailed in Table 4. Table 4: Gateway South Stage 1 Transmission Segments and Transfer Levels Project Section Path Existing Rating (MW) New Rating (MW) Simultaneous Interaction Aeolus Clover Aeolus South 1700 Aeolus West, (North-South) Bridger/Anticline West IPPDC (S-N) Red Butte- Harry Allen TOT 2C (Path 35) 300/300 (North- South / South- North) 400/580 (North- South/South- North) in 2011; increased to 600/580 MW (North- South/South- North) in 2015 IPP DC line, net 345 kv imports and line flows Potentially the SWIP project path ratings Pinto Four Corners TOT 2B1(Path 78) 530/600 (North-South / South-North) 600/600 (North- South / South- North) in 2011 IPP DC line, net 345 kv imports and line flows Potentially the SWIP project path ratings For the Gateway South Stage 1 Project, all study results comply with NERC TPL thru TPL Standards as well as WECC TPL - (001 thru 004) WECC-CRT- 2-System Performance Criterion. Additionally, PacifiCorp, Idaho Power and NV Energy planning criteria were applied. Technical studies demonstrated that the transmission path ratings noted in Table 4 are independent of other established path ratings, with the exception of the simultaneous interactions noted. 27

30 XVI. Gateway Central Transmission Project To meet the increasing demand of northern Utah, future Gateway Central transmission facilities are needed. These facilities would provide a link between Gateway West and Gateway South transmission facilities and would provide needed load service to the Wasatch Front. Populus to Terminal 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 (Clover) 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 proposed Limber substation to be built in Tooele County. The line will continue from Limber and connect to the Oquirrh Substation in West Jordan. 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 noted in Table 5. Depending on the load service request of the Tooele Valley, a new 345/138 kv substation will be installed at Limber. 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 noted in Table 5. Plan of Service and Planned Operating Dates An overview of the Gateway Central transmission system modification is summarized below. Table 5: Gateway Central Facilities and In-Service Dates Gateway Central - Transmission Facilities Dates Populus- Terminal double circuit 345 kv (135 miles) In-Service November 19,

31 Addition of the 500 kv single circuit between Clover (Mona) and Limber, energized at 345 kv (65 miles) Addition of the 345 kv double circuit between Limber and Oquirrh (32 miles) Addition of the 345 kv double circuit between Oquirrh and Terminal (14 miles) May 2013 May 2013 June 2015 Transfer Capabilities The transfer capabilities of Path C vary, depending on Gateway West project staging, as indicated in Table 2. 29

32 XVII. Future Generation Projects This section includes all significant generation projects (200 MW or greater) connected to or removed from the transmission system through step-up transformers or generation project that may have a significant impact on the reliability of the Western Interconnection. All projects not included in this list are in table 8a and 8b. Table 6: Significant Generation Additions- PacifiCorp East/ West Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies Lake side 2 Utah, Utah PacifiCorp TBD Under construction 637 MW Thermal Upgrade TBD complete 2014 Current Creek-phase 1&2 Juab, Utah PacifiCorp TBD MW Thermal Upgrade TBD complete Carbon Utah PacifiCorp On File MW Coal 138/13.8 kv Complete Retirement Carbon Utah PacifiCorp On File MW Coal 138/13.8 kv Complete Retirement 61 Beaver, UT PacifiCorp TBD suspended 200 MW Wind 230 suspended 130 Carbon, UT PacifiCorp TBD n/a 300 MW Wind 230 suspended 132 Albany, UT PacifiCorp TBD n/a 361 MW Wind 230 suspended 191 Carbon, WY PacifiCorp TBD suspended 500 MW Wind 345 suspended 199 Carbon, WY PacifiCorp On file MW Wind 230 underway 30

33 Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies 224-A Juab, UT PacifiCorp TBD suspended 320 MW Natural Gas 224-B Juab, UT PacifiCorp TBD suspended 230 MW Natural Gas 345 suspended 345 suspended 233 Carbon, WY PacifiCorp TBD suspended MW Wind 230 suspended 234 Umatilla, OR PacifiCorp On file suspended 300 MW Wind 230 underway 289 Lake, OR PacifiCorp TBD suspended 501 MW Wind TBD suspended 295 Carbon, WY PacifiCorp On file MW Wind 345 underway 375 Carbon, WY PacifiCorp On file MW Wind 230 underway 403 Sevier, UT PacifiCorp On file n/a 525 MW Natural Gas 345 underway 409 Albany, WY PacifiCorp On file n/a 320 MW Wind 230 underway 31

34 B. Waiver of Significant Transmission Project Status Table 7 and 8 (a and b) summarize planned transmission and generation projects, respectively, within the PacifiCorp system for which waivers of the Significant Transmission Project Status for the purpose of Project Coordination Review Process are being requested. The purposes of these projects are for serving local load, to enhance or maintain local reliability, and/or to reduce local capacity requirements. These projects are not expected to have significant impacts on the operation of the Western Interconnection. Number Table 7: Planned Transmission Projects (Waiver) Project Name Project Description In Service Date 1 Clover Substation - Add 345/138 kv transformer This project would add a 345/138 kv Transformer 450 MVA to the Clover substation. Project would include looping the Mona-Sigurd 345 kv #1 & #2 lines into Clover substation Terminal 345/138 kv #1 & #2 Transformer Upgrade Replace two - 345/138 kv 450 MVA transformers at Terminal with 700 MVA. Transformer would be added to meet projected load growth needs Copco Substation Increase Replace existing 125 MVA kv transformer with a 250 MVA Ben Lomond 345/138 kv #2 transformer 450 MVA Ben Lomond 345/138 kv #2 transformer, a 450 MVA transformer is moved from Terminal substation Carbon County System Upgrade 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. 2013

35 Number Project Name 7 Line 3 Conversion Project Project Description Rebuilt Baldy switching station, add three circuit breakers on the ring bus, convert Line 3, 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. In Service Union Gap 230/115 kv increase in capacity, add a third 250 MVA transformer Increase capacity at Union Gap Substation by adding a third 150 MVA transformers Whetstone 230/115 kv Substation Construct new 230 to 115 kv in the White City Oregon vicinity with a 250 MVA transformer. This substation will tap PacifiCorp s existing 230 kv line between Meridian and Grants Pass Substations Red Butte/ St. George Double Circuit Line and 345/138 kv Transformer 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 Syracuse 345/138 kv #2 Transformer This project would install a second 345/138 kv 400 MVA transformer at the Syracuse substation for load service Midvalley 345/138 kv #1 & #2 transformer replacement 700 MVA This project would replace existing Midvalley 450 MVA transformers with 700 MVA transformers and a 4th kv circuit breaker

36 Number Project Name Project Description In Service 13 Yellowtail 230/138 kv #2 transformer Yellowtail substation, install 2nd 230/161 kv (100 MVA) transformer Beyond Fry Substation, install 115 kv capacitors This project will install 100 MVAR of shunt capacitors at Fry Substation Troutdale Substation, 230 kv switchyard addition This project will add kv circuit breakers in a breaker and a half configuration

37 Table 8a: Planned Generation Interconnection Projects (PACE) Waiver Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies Planned Generation East 154 Bonneville, ID PacifiCorp On file MW Wind 69 Underway 128 Beaver, UT PacifiCorp TBD MW Wind 138 suspended 172-A Sweetwater, WY 172-B Sweetwater, WY 173 Sweetwater, WY PacifiCorp TBD n/a 150 MW Wind 230 suspended PacifiCorp TBD n/a 150 MW Wind 230 suspended PacifiCorp TBD n/a 150 MW Wind 230 suspended 175 Lincoln, WY PacifiCorp TBD MW Wind 230 suspended 184 Albany, WY PacifiCorp TBD MW Wind 230 suspended 185 Albany, WY PacifiCorp TBD MW Wind 230 suspended 186 Albany, WY PacifiCorp TBD MW Wind 230 suspended 200 Carbon, WY PacifiCorp On file MW Wind 230 Underway 201 Carbon, WY PacifiCorp On file MW Wind 230 Underway 255 Bingham, ID PacifiCorp On file MW Wind 161 Underway 267-A Sweetwater, PacifiCorp On file MW Wind 230 Underway

38 Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies WY 267-B Sweetwater, WY 267-C Sweetwater, WY 267-D Sweetwater, WY 290-A Sweetwater, WY 290-B Sweetwater, WY 290-C Sweetwater, WY PacifiCorp On file n/a 22 MW Wind 230 Underway PacifiCorp On file n/a 22 MW Wind 230 Underway PacifiCorp On file n/a 22 MW Wind 230 Underway PacifiCorp On file n/a MW Wind 230 Underway PacifiCorp On file n/a MW Wind 230 Underway PacifiCorp On file n/a 50.4 MW Wind 230 Underway 291 Carbon, UT PacifiCorp TBD n/a 100 MW Wind 345 suspended 306-A Converse, WY PacifiCorp TBD MW Wind 230 suspended 313 Beaver, UT PacifiCorp On file MW Geothermal 138 Underway 323-B Power, ID PacifiCorp On file MW Wind 230 Underway 324 Iron, UT PacifiCorp TBD MW Solar 138 suspended 36

39 Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies 335 Converse, WY PacifiCorp On file MW Wind 230 Underway 367 Iron, UT PacifiCorp On file n/a 172 MW Solar 345 Underway 384 San Juan, UT PacifiCorp On file n/a 60 MW Wind 345 Underway 397 Washington, UT 407 Sweetwater, WY PacifiCorp On file MW Wind 138 Underway PacifiCorp TBD n/a 79.8 MW Wind 230 suspended 420 San Juan, UT PacifiCorp On file n/a 140 MW Wind 138 Underway 425 Sublette, WY PacifiCorp On file n/a MW Natural Gas 138 Underway 426 San Juan, UT PacifiCorp On file n/a 80 MW Wind 230 Underway 427 Sweetwater, WY PacifiCorp On file n/a 80 MW Wind 69 Underway 432 Salt Lake, UT PacifiCorp On file n/a 6.3 MW Other 230 Underway 436 Iron, UT PacifiCorp On file n/a 50 MW Solar 230 Underway 440 Carbon, WY PacifiCorp On file n/a 80 MW Wind 138 Underway 442 Madison, ID PacifiCorp On file n/a 5.6 MW Natural Gas 230 Underway 37

40 Project Queue Number/Name Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies 450 Millard, ID PacifiCorp On file n/a 50 MW Solar 69 Underway 460 Millard, UT PacifiCorp On file n/a 160 MW Wind 230 Underway 461 Iron, UT PacifiCorp On file n/a 51 MW Solar 230 Underway 465 San Juan, UT PacifiCorp On file n/a 50.4 MW Solar 138 Underway 466 Iron, UT PacifiCorp On file n/a 25.6 MW Solar 138 Underway 468 Duchesne, UT PacifiCorp On file n/a 40 MW Solar 138 Underway 470 Tooele, UT PacifiCorp On file n/a 78.2 MW Wind 46 Underway 38

41 Table 8b: Planned Generation Interconnection Projects (PACW)- Waiver Project Queue Number Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies Planned Generation West 148 Umatilla, OR PacifiCorp suspended suspended MW Wind 230 suspended 225 Umatilla, OR PacifiCorp suspended suspended MW Wind 230 suspended 226 Umatilla, OR PacifiCorp On file n/a MW Wind 230 underway 230 Klamath, OR PacifiCorp On file MW Geothermal 69 underway 237-A Skamania, WA 237-B Skamania, WA 237-C Skamania, WA PacifiCorp suspended suspended 25 MW Hydro 230 suspended PacifiCorp suspended suspended 25 MW Hydro 230 suspended PacifiCorp suspended suspended 25 MW Hydro 230 suspended 247 Lake, OR PacifiCorp On file n/a 90 MW Wind 115 underway 276 Umatilla, OR PacifiCorp On file MW Wind 230 underway 316 Umatilla, OR PacifiCorp On file MW Wind 230 underway 319 Lake, OR PacifiCorp suspended suspended 26 MW Biomass 115 suspended 39

42 Project Queue Number Location Participants One-Line Diagram Status Generation Capacity Type Transmission Facilities (kv) Studies 350 Jackson, OR PacifiCorp suspended MW Hydro 69 underway 351 Klamath, OR PacifiCorp suspended suspended 39 MW Biomass 69 suspended 373 Klamath, OR PacifiCorp On file MW Solar 500 underway 393 Lake, OR PacifiCorp On file n/a 27 MW Geothermal 115 underway 411 Umatilla, OR PacifiCorp On file n/a 98.4 MW Wind 69 underway 429 Klamath, OR PacifiCorp On file MW Geothermal 69 underway 430 Klamath, OR PacifiCorp On file n/a 12 MW Geothermal 69 underway 431 Siskiyou, CA PacifiCorp On file n/a 12 MW Geothermal 69 underway 441 Umatilla, OR PacifiCorp On file n/a 98.9 MW Wind 230 underway 443 Crook, OR PacifiCorp On file n/a MW Solar 115 underway 445 Klamath, OR PacifiCorp On file n/a 12 MW Geothermal 69 underway 447 Crook, OR PacifiCorp On file n/a 80 MW Solar 115 underway 448 Crook, OR PacifiCorp On file n/a 80 MW Solar 115 underway 40

43 C. Updates to the Annual Progress Report from the Previous Submittal (2012) The following updates to the PacifiCorp were made in developing this document: 1) Black Rock added existing project which was not included in the 2012 report 2) Carbon Plant Decommissioning- added existing project which was not included in the 2012 report 3) Lakeside II Transmission Network Upgrades- added existing project which was not included in the 2012 report 4) Third Phase Shifter at Pinto- added as a new project to report 5) Huntington- Mona/ 345 kv Line Series Reactor at Mona/Clover - added as a new project to the report 6) Pinto-Huntington 345 kv Series Capacitor- removed from project list, completed March ) Casper-Dave Johnston 230kV #1 and #2 Line Rebuild- removed from project list, completed January ) Red Butte Static VAr Compensator- removed from project list, completed May ) Camp Williams-Terminal 345 kv#1 line loop in to Oquirrh Sub- removed from project list, completed June ) Meridian Substation-Install Two 230kV shunt capacitor banks of 130 MVAr each- removed from project list, completed June ) California-Oregon Intertie Upgrade- removed from project list, completed May ) Big Grassy Substation 161kV Install- project was not needed as part of the 2012 Assessment.

44 13) TOT4A Voltage Support Project has been divided into two projects. TOT4A Voltage support and Standpipe 230kV Synchronous Condenser 14) Table 6: Significant Generator Additions this table has been updated from the 2012 submission to give a more accurate depiction of significant generator additions. 15) Table 8a - Future Generation Projects-Significant Generation Additions Table (PACE) - this table has been updated from the 2012 submission to give a more accurate depiction of future generator additions. 16) Table 8b -Future Generation Projects-Significant Generation Additions Table (PACW) - this table has been updated from the 2012 submission to give a more accurate depiction of future generator additions. 17) Wallula to McNary 230 kv transmission Line #2- changed in service date from December 2013 to December ) Vantage-Pomona Heights 230kV Line- changed in service date from November 2013 to December ) Klamath Falls 500/230 kv Substation- changed in service date from 2018 to ) Grants Pass 500/230 kv substation- changed in service date from 2016 to ) Table 7- Planned Transmission Projects (Section B): Line 37 Conversion Project removed from table Mt. Shasta Substation- removed from table Copco to Weed Junction Line Conversion- removed from table Copco Substation Increase- changed in service date from 2012 to 2013 Line 3 Conversion project - changed in service date from 2013 to 2014 Union Gap 230/115 k V Increase in capacity, add a third 150 MVA transformerchanged in service date from 2013 to 2016 and change MVA on transformer from 150 to 250 MVA. Whetstone 230/115 kv substation- changed in service date from 2014 to 2015 Fry substation, install 115 kv capacitors added new project to list Troutdale substation 230kV switchyard addition - added new project to list Three Mile Knoll, install 2nd 345/138 kv transformer- project has been cancelled 42