Edison International on June 7 said that Southern California Edison (SCE) completed upgrades to the company’s West of Devers transmission lines in May.
The project involved removing and replacing conductors and supporting structures of four separate circuits of 220-kV transmission lines through the existing 48-mile corridor from the Devers substation near Palm Springs to the Vista and San Bernardino substations in Grand Terrace and San Bernardino, respectively — about 200 miles of power lines, Edison said, adding that that triples the capacity of power delivery from 1,600 MW to 4,800 MW.
Edison noted that as part of the project, “SCE entered into a transaction with Morongo Transmission for it to invest in the project, which allowed SCE to build the project across the Morongo Indian Reservation.”
Edison noted that SCE built the project by rebuilding within a corridor containing existing transmission lines, with the project spanning several Riverside and San Bernardino communities, including Banning, Beaumont, Calimesa, Colton, Grand Terrace, Loma Linda, Redlands, and other unincorporated areas of Riverside and San Bernardino counties in California.
“The corridor also passes through the reservation trust land of the Morongo Band of Mission Indians, a key partner with SCE in its bid to obtain environmental permits,” the company said.
The total cost of the project was $740m, with Morongo Transmission expected to invest $400m later this year, upon regulatory approval, Edison said.
SCE applied to FERC and the California Public Utilities Commission in 2013, requesting approvals to build the project, Edison said, adding that the company in 2017 received all necessary environmental permits and regulatory approvals to begin construction, which started in early 2018.
As noted on the project webpage, the project was projected to be in service in 4Q21.