How much battery storage does California have in 2026
California battery storage reached 21,112 megawatts serving the state as of August 7 2026, the California Energy Commission counts, and a megawatt measures how much power a battery can deliver at 1 moment. In 2019 the figure was less than 700 megawatts, an increase the commission puts at more than 2,500% in 7.5 years.
Nearly 16,000 megawatts comes from 310 utility scale battery systems inside California, meaning large batteries built to serve the grid rather than 1 building, and 2,000 megawatts more sits in Nevada and Arizona serving California. The remaining 3,000 megawatts comes from more than 300,000 smaller batteries at homes, schools, farms and businesses. About 18,000 megawatts is therefore utility scale, by arithmetic done for this article.
The commission gives the in state figure as nearly 16,000 and rounds each part, so the 3 rows sum to 21,000 rather than 21,112.
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| Utility scale, inside California | 16,000 |
| Utility scale, Nevada and Arizona | 2,000 |
| Homes, schools, farms and businesses | 3,000 |
What the batteries do each evening
Natural gas plants used to ramp up in the late afternoon as demand peaked and solar output fell, the commission states, and batteries now absorb part of that ramp. The California Independent System Operator, the grid operator serving about 80% of Californians, models battery charging between 8 in the morning and 3 in the afternoon. Battery discharge on that grid tripled in the first 5 months of 2026 against the same months of 2024, the United States Energy Information Administration reports. On the evening of July 9 2026 the fleet discharged a record 12.99 gigawatts, 1 gigawatt being 1,000 megawatts, and at peak covered 36% of demand across the operator region, GCN reports, citing the grid operator.
Gas generation fell 60% on the California grid
Utility scale solar generated more electricity than natural gas on the grid operator system in the first 5 months of 2026, the federal agency found using its hourly grid monitor. Against the same months of 2024, solar generation rose 21% and gas generation fell 60%, and solar out generated gas on 82% of days, against 21% of days in both 2024 and 2025. Gas had more capacity, not less. In April 2026 the system held 29 gigawatts of gas, nearly unchanged in 2 years, 25 gigawatts of utility scale solar, up 19%, and 16 gigawatts of batteries, up 79%. Imports from nearby systems doubled and net generation fell 19% while demand rose 7%, so not every lost gas megawatt hour was replaced inside the state.
Gas kept the most capacity, nearly unchanged since April 2024, and still generated less than solar on 82% of days in the first 5 months of 2026.
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| Natural gas | 29 |
| Utility scale solar | 25 |
| Battery storage | 16 |
Seeing solar surpass gas on the grid is proof that our vision of a 100% clean energy future is absolutely possible.
David Hochschild, chair of the California Energy Commission. Source 1.
The grid operator counts a surplus for summer 2026
The grid operator 2026 summer assessment credits more than 16,000 megawatts of batteries added since 2020 with meeting demand on hot evenings when solar output dips. It forecasts a 2026 peak of 46,844 megawatts on September 2 at 6 in the evening and finds a 2,547 megawatt surplus against the industry planning standard, under which supply may fall short no more than 1 day in 10 years.
The next approved project is an 8 hour battery
On May 26 2026 the commission approved a 400 megawatt battery in eastern Alameda County that can discharge up to 3,200 megawatt hours, a megawatt hour being the energy 1 megawatt delivers over 1 hour. Dividing 3,200 by 400 gives 8 hours at full power, by arithmetic done for this article, twice the 4 hour duration the commission says dominates the fleet today. The developer, Levy Alameda, LLC, a subsidiary of Clearway Energy Group, starts construction in May 2027 for about 18 months, the third project approved in a year under the accelerated state permitting program. The state target is more than 52,000 megawatts by 2045, and the commission says 21,112 megawatts is 41% of the way there.
The Opt-In Certification program proves that California can permit critical clean energy infrastructure fast while maintaining rigorous environmental review, public transparency, tribal consultation and community engagement.
Noemi Gallardo, commissioner at the California Energy Commission. Source 4.