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This will be larger than Vistra’s 750MW/3,000MWh facility, also located in Moss Landing, Calif., which is currently the world’s largest BESS, and was also commissioned in two phases.
Mortenson said this week that it has reached “substantial completion” and is “fully online.” Energy storage.News has asked Mortenson and project owner Terra-Gen what “substantial completion” means and will update this article when we hear back.
Engineering, procurement and construction (EPC) contractor Mortenson began construction about three years ago, with the first phase, representing about half of the total production capacity, coming online at the end of 2021.
The interconnected capacity of this project is 1,300MW. Offtakers include the City of San Jose, electric utilities Southern California Edison (SCE) and Pacific Gas & Electric (PG&E), Community Choice Aggregator (CCA) Clean Power Alliance, and coffee chain Starbucks. etc. are included.
BESS MW output is not disclosed, but most BESS projects in California have a duration of 4 hours (to qualify for grid operator CAISO’s Resource Adequacy Framework), so this BESS will be 821MW.
Portions of the project are located at Edwards Air Force Base, and Mortenson said it is the largest public-private collaboration in U.S. Department of Defense history.
“This facility, now fully operational, is a transformational project for the industry and provides resiliency to the grid,” said Brian Gowda, vice president of engineering at Terra-Gen.
Another notable energy storage project from Terra-Gen is the 140MW/560MWh Valley Center BESS, also located in California, which made headlines in 2023 for the wrong reasons (such as battery fires and theft of used batteries) became the headline.
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