According to the data from Grid Status, the peak output of battery storage in California reached a new high of 12,293 megawatts on Sunday, March 29, 2026, at 7 p.m. (local time). This is equivalent to 44% of the demand (the purple section in the chart below).
This is equivalent to:
– 15 to 20 combined-cycle gas power plants
– 6 Hoover Dams
– Even exceeding the peak electricity demand levels recorded in the histories of Portugal or Greece.
More than 90% of the battery storage facilities in California were built in the past five years, with the total capacity soaring from 1.3 gigawatts in 2020 to over 17 gigawatts.
The charging and discharging graph of the battery on that day:
