West of Devers Upgrade Project

The West of Devers Upgrade Project involves 48 miles of 220 kV double circuit construction running from the Devers Substation just north of Palm Springs to the San Bernardino and Vista substations to the west. The project is needed to import additional renewable energy from eastern interconnections to western metropolitan areas, and will increase the transmission capacity of the existing West of Devers corridor from the current 1,600 MW to about 4,800 MW. The line will use an existing corridor and is expected to improve reliability and reduce congestion in the area. There are two alternative configurations under consideration for this project, one of which includes and underground section. Based on SCE estimates, the cost of the project configured with the two alternatives is $878m, with a maximum cost cap of $1.01B. SCE states that this project will be operational by 2021.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Southern California Edison 48 220 CA CA 2021
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
1010 Planned Devers Vista
Interstate Build Start NERC ISO/RTO Country Project Partners
WECC CAISO US