On August 1, 2023, Vistra Corp. announced that it had completed the 350-megawatt/1,400-megawatt-hour Phase III expansion of its Moss Landing Energy Storage Facility in California, bringing the site’s total capacity to 750 MW/3,000 MWh and making it the largest grid battery system in the U.S.[1] The Phase III expansion reached commercial operation on June 2. The facility will operate under a 15-year resource adequacy agreement with Pacific Gas and Electric Company (PG&E) beginning August 1, 2023. The Phase III expansion is made up of 122 individual containers that house more than 110,000 battery modules. The project was completed on schedule and within budget in 16 months. Moss Landing Energy Storage Facility is co-located on the site of Vistra's existing natural gas-fueled Moss Landing Power Plant.
Vistra now owns the second-most energy storage capacity in the country. In addition to its California assets, the company owns and operates two solar facilities, one solar-plus-storage facility, and a 260-MW storage facility in Texas. Vistra has plans for four solar installations and ten other storage and solar-plus-storage facilities, all in development in Illinois and Texas. The energy company is also in the process of acquiring Ohio-based Energy Harbor Corp. and its 4,000 MW nuclear fleet.
[1] https://investor.vistracorp.com/2023-08-01-Vistra-Completes-Milestone-Expansion-of-Flagship-California-Energy-Storage-System
