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The AES Corporation has commenced operations of the Alamitos battery energy storage system (BESS), one of the world’s largest battery storage systems in operation today.

The BESS, a stand-alone energy storage facility for local capacity, will provide up to 400MWh of energy to ensure greener, smarter and more reliable power to Southern California Edison (SCE) customers, while also helping the State of California meet its sustainability goal of 100% carbon-free energy by 2045.

The AES Alamitos BESS is contracted under a 20-year power purchase agreement (PPA) with SCE and is located at the AES Alamitos Energy Center.

The AES Alamitos BESS will provide Southern California with reliable power during times of peak demand, while also supporting a cleaner energy future for SCE customers by enabling increased integration of renewable energy.

The BESS technology at the Alamitos facility includes Advancion 5 batteries provided by Fluence. When fully charged, the batteries supply power to tens of thousands of homes in milliseconds.

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As California moves forward with its transition to a greener energy future, renewables and energy storage will play a central role in the electricity generation mix across the state.

Mark Miller, AES Corporation market business leader for California and AES Southland general manager, said: “With the commissioning of the Alamitos BESS, the State of California moves closer to its goal of a more sustainable and reliable energy future. AES is proud to work together with Southern California Edison to accelerate the adoption of this greener, smarter energy technology.”

William Walsh, SCE vice president of energy procurement & management, said: “SCE sees a growing role for battery storage as California transitions to 100% clean renewable energy.

“Battery storage will help integrate wind and solar resources into our grid and improve reliability.”