The world’s largest single-phase battery is now online in California

https://pv-magazine-usa.com/2022/10/18/the-worlds-largest-single-phase-battery-is-now-online/

"350 MW / 1400 MWh of standalone battery energy storage, delivering flexible power to California’s grid... electricity to power more than 47,000 homes each year... developed by Axium Infrastructure and Canadian Solar"