The U.S. battery energy storage market is no longer waiting for the back half of the year to prove SEIA's 70 GWh forecast. First-quarter deployments reached 9.7 GWh, a record start that puts 2026 ahead of last year's pace even before the construction-heavy summer and fall periods. The February forecast still matters, but the May update changes the readout. Texas remains the growth engine, utility-scale projects are carrying the market, and the sector now has enough early-year data to judge whether 35 GW / 70 GWh is ambition or a real buildout trajectory. AI-generated image Battery rack modules inside a modern utility-scale BESS facility. Credit: AI-generated / CurrentCells ★ Updated - May 27, 2026 Q1 Confirmed the Storage Boom Is Ahead of Schedule SEIA's newest quarterly readout gives the February outlook its first real test. The U.S. installed 9.7 GWh of battery storage in the first quarter of 2026, up 32% from the same period last year. That is still well below the average quarterly pace needed to reach 70 GWh, but storage deployments are usually back-loaded. The key point is that the market did not stumble out of January's slow global start. Utility-scale systems continue to do the heavy lifting. Texas, Arizona, and California remain the states to watch, with ERCOT's merchant price signals pulling new batteries into the queue and Western load growth keeping Arizona near the top of the project list. EIA's 2026 capacity tracker still points to roughly 24 GW of new utility-scale battery additions nationally, with Texas accounting for more than half of planned power capacity. 9.7 GWh Q1 2026 U.S. additions 32% Year-over-year Q1 growth 24 GW EIA projected 2026 utility additions 53% Texas share of planned 2026 utility GW What the May data changes The 70 GWh forecast now looks less like a trade-group aspiration and more like a plausible base case if interconnection and equipment delivery hold. Q1 supplied 13.9% of the annual energy target. That would be weak for a flat installation calendar, but storage is not flat. Developers tend to bring large projects online late in the year, after winter construction slowdowns and ahead of summer reliability needs. The bigger constraint is no longer demand. It is execution: transformers, grid studies, interconnection agreements, battery-container delivery slots, and tariff risk on imported LFP cells. 2025 in Review: 28GW Installed Across the Country Before looking ahead, it helps to understand the base that 2026 is building on. According to SEIA's data, the U.S. installed more than 28GW (57GWh) of battery storage capacity during 2025. The utility-scale segment drove most of that activity, accounting for nearly 16GW/50GWh. Behind-the-meter (BTM) installations made up the remaining 12GW/8GWh, holding steady at roughly 13% of total market share. Three states dominated the utility-scale picture. California led with 59,815MWh of cumulative additions, followed by Texas at 26,271MWh and Arizona at 19,334MWh. Together, those three states accounted for 74% of all utility-scale storage installed last year. Nevada came in a distant fourth at 6,331MWh, highlighting just how concentrated the market remains geographically. AI-generated image California, Texas, and Arizona account for nearly three-quarters of U.S. utility-scale battery storage deployments. Credit: AI-generated / CurrentCells The BTM market saw a particular bump in the residential segment. SEIA attributes part of that growth to the expiration of the 25D residential tax credit at the end of 2024, which triggered a rush of installations as homeowners scrambled to lock in incentives before they disappeared. Commercial and industrial BTM storage also contributed, though the residential surge was the headline story for that segment. SEIA's Energy Storage Market Outlook: Key 2025 Figures Total installed: 28GW / 57GWh (29% year-over-year growth) Utility-scale: 16GW / 50GWh Behind-the-meter: 12GW / 8GWh (13% market share) Top states: California (59,815MWh), Texas (26,271MWh), Arizona (19,334MWh) Solar pairing: 48% of storage co-located with solar; 51% standalone One notable data point from the report: 48% of all storage capacity installed last year was paired with solar generation, while 51% was standalone BESS and just 1% was paired with wind. That near-even split between co-located solar-plus-storage and standalone batteries reflects two different use cases. Solar-paired systems optimize for shifting daytime generation into evening peak hours. Standalone systems tend to serve grid balancing, frequency regulation, and capacity market needs, roles that don't depend on a specific generation source. The 2026 Forecast: $25.2 Billion in Capital Investment SEIA projects that 2026 will see 35GW/70GWh of new BESS deployments. The utility-scale segment is expected to account for the bulk at 20.2GW/62.4GWh, with BTM installations contributing 14.8GW/7.3GWh. The total capital required to build all of this capacity comes to an estimated $25.2 billion. AI-generated image Construction crews assembling battery containers at a utility-scale solar-plus-storage project. Credit: AI-generated / CurrentCells These numbers exist within a policy environment that has shifted substantially. The One Big Beautiful Bill Act (OBBBA), passed during 2025, restructured several federal incentives for energy storage. While the legislation's full effects are still playing out, SEIA's projections suggest the market has enough momentum and contracted pipeline to deliver strong growth regardless of near-term policy uncertainty. Texas remains a critical state to watch. ERCOT's energy-only market structure creates strong price signals for storage operators, especially during summer peak demand and winter weather events. California's trajectory is driven more by state mandates and the duck curve problem, where midday solar overgeneration creates steep evening ramp needs that only storage can address cost-effectively. Arizona's emergence as the third major market reflects rapid load growth from data centers and semiconductor manufacturing facilities clustered around Phoenix. 70 GWh Projected 2026 Deployments $25.2B Estimated Capital Investment 35 GW Total Power Capacity 74% Share from CA, TX, AZ 500 GWh Cumulative by 2030 110 GWh Annual Installs by 2030 Global Context: A Slow Start to 2026 While the U.S. outlook is bullish, global BESS deployment data for early 2026 tells a more cautious story. Benchmark Mineral Intelligence reported that roughly 3.5GW/10.5GWh of grid-scale BESS began commercial operation worldwide in January 2026. That represents a 25% decrease compared to January 2025, when 5.2GW/13.8GWh came online globally. North America's January numbers were particularly modest: just 169MW/523MWh came online during the month. Seasonal construction patterns explain some of that dip, since ground-mounted installations in northern states typically slow during winter months. But the gap between January's actual deployments and the full-year 70GWh target underscores how back-loaded the U.S. installation calendar tends to be, with Q3 and Q4 historically accounting for the majority of annual capacity additions. AI-generated image Market analysts tracking BESS deployment growth across global markets. Credit: AI-generated / CurrentCells China continues to account for the dominant share of global grid-scale storage activity, a pattern that has held for several years running. Chinese battery manufacturers like CATL, BYD, and EVE Energy supply the vast majority of global BESS cells, and domestic policy mandates requiring renewable energy projects to include storage have created a massive captive market. For U.S. developers, the supply chain implications are real: most lithium iron phosphate (LFP) cells going into American BESS projects still originate from Chinese factories, even when assembled into systems by U.S. or European integrators. The Bankability Question Across the Atlantic, the Energy Storage Summit