California accounts for half of US battery storage growth in power systems, with 8.6 GW capacity as of 2021.

California leads US battery storage growth in power systems, accounting for roughly half of the country's utility-scale battery capacity since 2019. California's 8.6 gigawatts (GW) of battery storage capacity is twice as much as the capacity in place in Texas, the second-largest deployer of battery storage. The US battery storage capacity is currently estimated at around 17.5 GW, with a potential increase to over 30 GW by year-end.