Columbia Grid Planning Meeting FERC Order 1000 Activities

Columbia. Grid Planning Meeting FERC Order 1000 Activities June 7, 2018 1

In This Presentation ITP Submittal Summary Overview of ITPs – based on public information provided by project sponsors Status Ongoing activities Milestones/Timeline 2

Interregional Transmission Project (ITP) Submittals 3

ITP: Six (6) Projects For more information regarding these projects, please refer to: https: //www. columbiagrid. org/O 1000 Interoverview. cfm 4

Trans. West Express Transmission DC Project sponsor: Trans. West Express LLC Technology: Two-Terminal, 600 k. V, Bipole HVDC Connections: Northern terminal: Wyoming (NTTG & potential West. Connect) Southern terminal: Nevada (CAISO, West. Connect) Capacity: Phased 1, 500/3, 000 MW In-Service Date: 2022 Cost Estimate: $2. 11 B (initial phase), $0. 87 B (increase the capacity to 3, 000 MW) 5

Trans. West Express Transmission DC Project* *Based on a presentation from Trans. West Express LLC , March 31, 2018 6

Trans. West Express Transmission DC Project* *Based on a presentation from Trans. West Express LLC, March 31, 2018 7

Trans. West Express Transmission AC&DC Project sponsor: Trans. West Express LLC Technology: Two-Terminal, 500 k. V, Bipole HVDC and 500 k. V AC Connections: Northern terminal: Wyoming (NTTG & potential West. Connect) Southern terminal: Nevada (CAISO, West. Connect) DC segment connects with the AC segment in Utah Capacity: Phased 1, 500/3, 000 MW In-Service Date: 2022 Cost Estimate DC segment: $1. 62 B (1, 500 MW), $0. 87 B (increase to 3, 000 MW) AC segment: $600 M 8

Trans. West Express Transmission AC &DC Project* *Based on a presentation from Trans. West Express LLC, March 31, 2018 9

Trans. West Express Transmission AC&DC Project* *Based on a presentation from Trans. West Express LLC , March 31, 2018 10

Cross-Tie Transmission Project sponsor: TRANSCANYON Technology: 213 mile, 500 k. V AC Transmission line Connections: Clover (NTTG) & Robinson Summit (West. Connect) 500 k. V substations Anticipated Project rating: 1, 500 MW In-Service Date: Q 4 2024 Cost Estimate: $667 M 11

Cross-Tie Transmission Line* *Based on a presentation from Transcanyon , May 18, 2018 12

Cross-Tie Transmission Line* *Based on a presentation from Transcanyon, May 18, 2018 13

Southwest Intertie Project (SWIP) - North Project sponsor: Great Basin Transmission (LS POWER) Technology: 275 mile, 500 k. V AC Transmission line Connections: Midpoint (NTTG) & Robinson Summit (West. Connect) 500 k. V substations In-Service Date: As early as 2021 Cost Estimate: $525 M 14

SWIP - North* *Based on a presentation from LSPOWER , Great Basin Transmission, May, 2018 15

Southwest Intertie Project (SWIP) - North* *Based on a presentation from LSPOWER , Great Basin Transmission, May, 2018 16

North Gila – Imperial Valley #2 Project Development team: ITC Grid Development, LLC & Southwest Transmission Partners, LLC Technology: 97 -mile, 500 k. V AC Transmission line Connections: North Gila (West. Connect) & Imperial Valley (CAISO) 500 k. V substations Also interconnect with a new Highline substation (West. Connect) In-Service Date: Q 4 2022 Cost Estimate: $250 M-$400 M 17

North Gila – Imperial Valley #2* 18 *Based on a presentation from ITC Grid Development, LLC and Southwest Transmission Partners, LLC, May 18, 2018

North Gila – Imperial Valley #2* 19 *Based on a presentation from ITC Grid Development, LLC and Southwest Transmission Partners, LLC, May 18, 2018

Renewable Energy Express HVDC Conversion Project sponsor: San Diego Gas and Electric (SDG&E) Technology: Conversion of a portion of existing 500 k. V AC Transmission line to a three-terminal HVDC system Anticipated Project rating: 3, 000 MW In-Service Date: 2026 Cost Estimate: $900 M – $1 B 20

Renewable Energy Express HVDC Conversion Project* *Based on a presentation from SDG&E 21

Renewable Energy Express HVDC Conversion Project* *Based on a presentation from SDG&E 22

ITP Evaluation: Status • Evaluation plans are being drafted • For each ITP • Primarily, describe the scope, and methodology will be used by the Relevant Planning Regions to evaluate each project • Anticipated completion: End of 2019 23

Question: Paul Didsayabutra, paul@columbiagrid. org 24