ColumbiaGrid Planning Meeting FERC Order 1000 Activities June 7, 2018

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

Interregional Transmission Project (ITP) Submittals

ITP: Six (6) Projects For more information regarding these projects, please refer to: https://www.columbiagrid.org/O1000Inter- overview.cfm

TransWest Express Transmission DC Project Project sponsor: TransWest Express LLC Technology: Two-Terminal, 600kV, Bipole HVDC Connections: Northern terminal: Wyoming (NTTG & potential WestConnect) Southern terminal: Nevada (CAISO, WestConnect) Capacity: Phased 1,500/3,000 MW In-Service Date: 2022 Cost Estimate: $2.11B (initial phase), $0.87B (increase the capacity to 3,000 MW)

TransWest Express Transmission DC Project* *Based on a presentation from TransWest Express LLC , March 31, 2018

TransWest Express Transmission DC Project* *Based on a presentation from TransWest Express LLC, March 31, 2018

TransWest Express Transmission AC&DC Project Project sponsor: TransWest Express LLC Technology: Two-Terminal, 500kV, Bipole HVDC and 500 kV AC Connections: Northern terminal: Wyoming (NTTG & potential WestConnect) Southern terminal: Nevada (CAISO, WestConnect) DC segment connects with the AC segment in Utah Capacity: Phased 1,500/3,000 MW In-Service Date: 2022 Cost Estimate DC segment: $1.62B (1,500 MW), $0.87B (increase to 3,000 MW) AC segment: $600M

TransWest Express Transmission AC &DC Project* *Based on a presentation from TransWest Express LLC, March 31, 2018

TransWest Express Transmission AC&DC Project* *Based on a presentation from TransWest Express LLC , March 31, 2018

Cross-Tie Transmission Project Project sponsor: TRANSCANYON Technology: 213 mile, 500 kV AC Transmission line Connections: Clover (NTTG) & Robinson Summit (WestConnect) 500 kV substations Anticipated Project rating: 1,500 MW In-Service Date: Q4 2024 Cost Estimate: $667M

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

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

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

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

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

North Gila – Imperial Valley #2 Project Development team: ITC Grid Development, LLC & Southwest Transmission Partners, LLC Technology: 97-mile, 500 kV AC Transmission line Connections: North Gila (WestConnect) & Imperial Valley (CAISO) 500 kV substations Also interconnect with a new Highline substation (WestConnect) In-Service Date: Q4 2022 Cost Estimate: $250M-$400M

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

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

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

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

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

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

Question: Paul Didsayabutra, paul@columbiagrid.org