Utility-scale battery storage capacity in the United States reached nearly 52 gigawatts by mid-2026, after growing at an average annual rate of 70 per cent over the past three years, according to new data from the U.S. Energy Information Administration.
The EIA’s Preliminary Monthly Electric Generator Inventory report shows that operators brought an additional 8.3 GW of battery storage capacity online during the first six months of 2026, pushing the national total from 43.6 GW at the end of 2025 to nearly 52 GW. Developers have plans to bring an additional 54 GW online over the next two and a half years, with 14 GW scheduled for the second half of 2026, 26 GW in 2027, and 14 GW in 2028.
Solar-Battery Pairing Drives Growth
Solar photovoltaic plants now host the largest battery storage units in the country. The Bellefield Solar and Energy Storage Farm, which began operations in December 2025 in California, couples 500 MW of photovoltaic capacity with 500 MW of nameplate power storage. Plans call for doubling both the PV and storage capacity by November, which would make it the largest power storage facility in the United States.
The Manatee Solar Energy Center in Florida, operational since 2021, holds the second position with 409 MW of battery storage paired with 75 MW of solar. In Nevada, the Gemini Solar Hybrid facility combines 690 MW of photovoltaic capacity with 380 MW of power storage.
| Metric | Value |
|---|---|
| Total US battery storage (June 2026) | Nearly 52 GW |
| End of 2025 capacity | 43.6 GW |
| Additions H1 2026 | 8.3 GW |
| Planned additions 2026-2028 | 54 GW |
| 3-year average annual growth rate | 70% |
Texas Leads the Expansion
Battery storage growth is following solar additions regionally. ERCOT territory alone is projected to expand its battery storage fleet from 15 GW in 2025 to 37 GW by the end of 2027 to manage surging solar generation in Texas. The EIA forecasts 70 GW of new solar generating capacity coming online in 2026 and 2027, representing a 49 per cent increase in total U.S. operating solar capacity compared to the end of 2025.
Solar and storage facilities enable operators to store power when wholesale electricity prices are low and discharge electricity when prices are high, allowing power producers to capture larger profits. This arbitrage model has proven particularly lucrative in Texas, where solar generation peaks during hours of moderate demand and stored power can be dispatched during expensive evening peak periods.
The rapid expansion comes as the broader U.S. power grid faces record additions. The EIA projects 86 GW of new power capacity in 2026, the largest single-year increase since 2002, with solar accounting for 51 per cent, battery storage for 28 per cent, and wind for 14 per cent of that total.
Sources: U.S. Energy Information Administration, Preliminary Monthly Electric Generator Inventory (August 2026); EIA Today in Energy; PV Magazine; ESS News
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