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SCE Completes Transmission Project to Support California’s Clean Energy Goals

West of Devers transmission line enhances reliability while expanding access to renewable energy, storage

Southern California Edison’s support of California’s clean energy goals hit a tangible milestone in May with the completion of upgrades to SCE’s West of Devers transmission lines. The project increases transmission capacity necessary to bring renewable generation — more than 7,000 megawatts of renewable and battery energy storage resources in the coming years — from desert areas in the eastern part of California to the population centers of the Inland Empire and San Gabriel Valley.

“Completing the West of Devers Project is another giant step in our ability to deliver clean energy throughout our service area,” said Kevin Payne, SCE president and CEO. “While distributed energy resources like rooftop solar and battery energy storage will contribute to decarbonizing our electric infrastructure, large-scale generation and reliable delivery of renewable energy will be vital to achieve California’s ambitious climate goals.”

The project consisted of removing and replacing conductors and supporting structures of four separate circuits of 220-kiloVolt 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. It triples the capacity of power delivery from 1,600 MW to 4,800 MW, which helps with system reliability into the Southern California population centers during peak summer demand. It took many years of planning, siting, public engagement, licensing and construction to bring this project to fruition.

As part of the West of Devers 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. The total cost of the project was $740 million, with Morongo Transmission expected to invest $400 million later this year (upon regulatory approval).

SCE applied in 2013 to the Federal Energy Regulatory Commission and the California Public Utilities Commission requesting approvals to build the project. In 2017, the company received all necessary environmental permits and regulatory approvals to start construction, which began in early 2018. West of Devers went into service about five months before its originally projected timeframe.

“The ability to achieve commercial operation ahead of schedule is a testament to the commitment and dedication of all the project team members and the multitude of stakeholders who contributed to the project’s success,” said Chuck Adamson, principal manager of Major Construction for SCE. “With the complexities that accompany a modern-day transmission project, this achievement cannot be overstated.”

SCE built the project in an environmentally beneficial way by rebuilding within a corridor containing existing transmission lines, despite the unique operational challenges of this approach. The project spans 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. 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.

About Southern California Edison

An Edison International (NYSE: EIX) company, Southern California Edison is one of the nation’s largest electric utilities, serving a population of approximately 15 million via 5 million customer accounts in a 50,000-square-mile service area within Central, Coastal and Southern California.

Contacts

Media Contact: David Song, (626) 302-2255

Investor Relations Contact: Sam Ramraj, (626) 302-2540

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