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Vistra brings largest utility-scale BESS online in California [free access]

January 6, 2021

Texas-based energy company, Vistra Energy, recently announced that the Moss Landing Energy Storage Facility, which is the world’s largest utility-scale battery energy storage system (BESS), has been connected to the grid.


The 300 MW/1,200 MWh lithium-ion BESS is located on-site at Vistra's Moss Landing Power Plant in Monterey County, California. Phase I of the battery system is made up of more than 4,500 stacked battery cabinets, each containing 22 individual battery modules. The latter capture excess electricity from the grid, largely during high solar-output hours, and can release the power when energy demand is at its highest.


The battery system is expected to enhance grid stability and benefit the local community significantly. Furthermore, construction is already underway on Phase II, which will add an additional 100 MW/400 MWh to the facility by August 2021, bringing its total capacity to 400 MW/1,600 MWh.


Phases I and II of the Vistra Moss Landing Energy Storage Facility are backed up by long-term resource adequacy contracts with Pacific Gas and Electric Company (PG&E).