California’s battery storage capacity has reached a new milestone, now totaling 16,942 megawatts (MW), according to state officials. This figure represents an increase of about 1,200 MW in the last six months and marks a 2,100% rise since Governor Gavin Newsom assumed office in 2019. The state has now achieved one-third of the storage capacity projected to be necessary by 2045 to meet its clean energy objectives.
Governor Newsom also announced that California will join the Global Energy Storage and Grids Pledge, an initiative associated with COP climate talks. More than 100 countries and organizations back this pledge, which aims to deploy 1,500 gigawatts of energy storage worldwide, double global grid investments, and construct 25 million kilometers of new transmission lines by 2030. California is the first subnational entity to sign on.
“Donald Trump’s reckless energy agenda puts China first and America last — letting Beijing seize the global clean energy economy and the good-paying jobs, manufacturing, and economic prosperity that come with it. California won’t stand by and watch,” Gov. Newsom said. “While Donald Trump is failing, the Golden State is leading. We’re deploying more battery storage than any state in America, building a stronger grid, cutting pollution, and making abundant clean energy even more affordable.”
Battery storage plays a significant role in maintaining grid reliability by storing surplus solar and wind power for use during peak demand periods. Officials noted that California has not had to call for voluntary conservation through Flex Alerts for three consecutive years due to these improvements.
Of the total capacity reported, large utility-scale projects account for 13,880 MW. Behind-the-meter systems installed on over 200,000 homes contribute another 2,213 MW; additional installations at businesses, schools, and local government facilities add up to 849 MW.
Globally, only China surpasses California in installed battery capacity; within the United States, Texas follows with approximately 9,000 MW.
State officials contrasted their progress with federal policies under former President Trump while noting that renewable energy has become the least expensive source of electricity generation globally and that battery storage costs have dropped by roughly 93% since 2010.
“These systems are proving every day that a clean energy grid can be both clean and reliable, and that California’s investments are delivering results,” said California Energy Commission Chair David Hochschild.
“California is showcasing how to cost-effectively plan for and build our clean energy future,” said California Public Utilities Commission (CPUC) President Alice Reynolds. “The state is setting the standard for deploying storage resources to complement a grid increasingly powered by renewable energy. It’s a smart way to manage electricity costs while reducing greenhouse gas emissions and adapting to climate change.”
Officials credited increased battery deployment with helping avoid outages during extreme weather events such as heatwaves in recent years. Since these investments began ramping up after emergencies in previous summers exposed vulnerabilities in supply flexibility—and agencies responded by procuring additional battery resources—the state has not needed emergency conservation measures even during record temperatures.
Currently available battery systems can cover roughly one-quarter of California’s peak electricity demand for several hours at a time.
Safety remains an ongoing focus as technology advances. Last September saw creation of a cross-agency group dedicated to improving safety protocols around battery system development; updates are underway for fire codes related specifically to these installations; CPUC introduced new maintenance requirements earlier this year; Senate Bill 283 was recently signed mandating engagement between developers and local fire authorities on risk assessment plans.
While rare incidents involving fires have occurred among thousands of deployed systems worldwide—prompting continued attention—officials emphasized evolving construction standards such as outdoor installation with fireproof barriers between packs along with advanced heat detection technology designed for early warning.
California’s expansion of battery storage supports its broader goal: achieving all-clean electricity generation statewide by mid-century. Nearly two-thirds of retail electric sales already come from renewables within state borders; coal-fired power will be phased out entirely from California’s mix before year-end; on average this year so far nearly six hours per day have seen demand met exclusively through carbon-free sources across most major population centers served by the state’s primary grid operator.
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