Contents
- Grid scale battery capacity statistics: global installed power and annual additions
- Grid scale battery capacity statistics: growth in the United States
- grid scale battery capacity statistics: utility-scale battery size, project ratings and duration
- grid scale battery capacity: grid-scale batteries relative to electricity peak demand
- grid scale battery capacity: California fleet capacity and survey scope
- Sources
Grid scale battery capacity statistics: global installed power and annual additions
Global capacity figures describe both the flow of new installations and the accumulated fleet. Utility-scale battery storage additions reached 63 GW worldwide in 2024, bringing total installed utility-scale capacity to 124 GW. The 63 GW figure is annual power capacity added; 124 GW is the cumulative installed power capacity reported for that year. These are complementary measures, not interchangeable totals. Source: IEA, Flexibility – Electricity 2026
China’s 2024 figures use a broader category than utility-scale batteries. The IEA reports about 42 GW and 101 GWh of additions in “new-type energy storage,” corresponding to an average duration of around 2.3 hours. This category excludes pumped hydropower and includes both front-of-the-meter and user-side installations, so the figures should not be read as battery-only or utility-scale totals. GW measures power; GWh measures stored energy; duration describes the relationship between them in the reported additions. Source: IEA, Flexibility – Electricity 2026
| Measure | Reported value | Scope and period |
|---|---|---|
| Utility-scale battery additions | 63 GW | Global, 2024 |
| Installed utility-scale battery capacity | 124 GW | Global cumulative total, 2024 |
| New-type energy storage additions | About 42 GW; 101 GWh | China, 2024; broader than batteries alone |
| Average duration of those additions | Around 2.3 hours | China new-type energy storage, 2024 |
The figures show why a capacity statistic needs its definition alongside its value. A national storage total that includes user-side resources cannot be compared directly with a global utility-scale total. Similarly, annual additions describe deployment during a period, while installed capacity describes the fleet accumulated by a point in time. The supplied observations do not provide a uniform breakdown across all countries, so these figures support a description of scale and scope rather than a complete country ranking. Source: IEA, Flexibility – Electricity 2026
Grid scale battery capacity statistics: growth in the United States
The U.S. figures distinguish operational capacity at year-end from nameplate capacity later in the following year. The U.S. power system had 43.6 GW of operational battery storage at the end of 2025. Operators added 8.3 GW during January through June 2026, and the reported nameplate total reached nearly 52 GW by June 2026, based on the preliminary monthly generator inventory. These observations have different dates and capacity descriptions; the June nameplate value should not be presented as an operational year-end total. Source: U.S. EIA, “Battery storage capacity averaged 70% growth over the last three years”
The EIA also reports an annual average growth rate of 70% for U.S. utility-scale battery storage capacity during the 3 years before August 7, 2026. That rate is a historical measure for the stated period, not a forecast. Separate figures describe operator plans: 54 GW of additional capacity was anticipated over the next 2.5 years, including 14 GW planned for the second half of 2026, 26 GW in 2027, and 14 GW in 2028. These are reported plans, not completed additions. Source: U.S. EIA, “Battery storage capacity averaged 70% growth over the last three years”
| U.S. measure | Value | Date or period |
|---|---|---|
| Operational battery storage capacity | 43.6 GW | End of 2025 |
| Capacity added | 8.3 GW | January–June 2026 |
| Nameplate battery storage capacity | Nearly 52 GW | June 2026 |
| Annual average growth rate, utility-scale capacity | 70% | 3 years before August 7, 2026 |
| Operator-reported planned additions | 14 GW; 26 GW; 14 GW | Second half of 2026; 2027; 2028 |
The EIA’s project examples show how battery power ratings appear alongside solar capacities. Bellefield Solar and Energy Storage Farm, which began operating in December 2025, pairs 500 MW of photovoltaic capacity with 500 MW of nameplate power storage and serves CAISO. Florida’s Manatee Solar Energy Center, operational since 2021, has 409 MW of battery storage capacity and 75 MW of solar capacity. Nevada’s Gemini Solar Hybrid has 380 MW of power storage capacity alongside 690 MW of photovoltaic capacity and became operational in 2024. These examples are project ratings, not measures of energy stored in GWh or duration. Source: U.S. EIA, “Battery storage capacity averaged 70% growth over the last three years”
grid scale battery capacity statistics: utility-scale battery size, project ratings and duration
Average project capacity offers a different view from total fleet growth. In the United States, average utility-scale battery capacity rose from about 15 MW in 2021 to around 35 MW in 2024, according to the IEA. The values describe average power capacity, not energy capacity or the total number of projects. Source: IEA, Flexibility – Electricity 2026
Several project and procurement examples report both power and energy ratings or specify duration. A battery system under construction by LEAG and Fluence in Germany was rated at 1,000 MW and 4,000 MWh when reported in 2026. In Australia, the Eraring system was set to expand from 460 MW to 700 MW in 2027, with a planned energy volume of 2,800 MWh. Saudi Arabia commissioned the Bisha facility at 500 MW and 2,000 MWh in 2025. The paired MW and MWh ratings describe power and energy capacity respectively; the source identifies planned, under-construction, and commissioned status for each example. Source: IEA, Flexibility – Electricity 2026
| Example | Power capacity | Energy capacity | Status or period reported |
|---|---|---|---|
| LEAG and Fluence, Germany | 1,000 MW | 4,000 MWh | Under construction, reported 2026 |
| Eraring, Australia | 460 MW to 700 MW | 2,800 MWh | Expansion planned for 2027 |
| Bisha, Saudi Arabia | 500 MW | 2,000 MWh | Commissioned in 2025 |
Duration distributions add another dimension. In Great Britain, 98% of new battery capacity added in Q4 2024 had a duration of at least 2 hours. In Australia’s National Electricity Market, 95% of battery capacity post-2024 was designed for durations of at least 2 hours. The IEA also reports that the market’s average duration was 1.5 hours in 2024 and was expected to reach 2.5 hours in 2027. The first two percentages refer to shares of capacity meeting a duration threshold; the latter values are average durations. Source: IEA, Flexibility – Electricity 2026
China’s cumulative new-type energy storage installations had an average duration of about 2.1 hours in 2021 and around 2.6 hours in 2025. As with China’s additions above, this is a broader category that is not battery-only. Procurement targets also use energy units: Italy’s first MACSE auction contracted 10 GWh of utility-scale battery storage for delivery in 2028, including about 1.3 GWh with durations of 8 hours or more. Italy’s auction mechanism aimed to procure 50 GWh of BESS capacity by 2030. Great Britain’s long-duration energy storage cap-and-floor scheme had an indicative capacity range of 2.7 to 7.7 GWh by 2035. These are procurement or scheme figures, not installed fleet totals. Source: IEA, Flexibility – Electricity 2026
grid scale battery capacity: grid-scale batteries relative to electricity peak demand
A battery-to-peak-load ratio compares installed battery power capacity with peak electricity load. In 2024, California’s installed utility-scale battery storage was almost 25% of peak load. South Australia and the United Kingdom were each around 15%. These figures use battery nameplate capacities and cover grid-scale batteries; industrial and domestic batteries are excluded. Nameplate capacity is a rated measure, and the IEA cautions that actual discharge can be lower. The ratios therefore compare rated power with peak load rather than reporting energy delivered or duration. Source: IEA, Flexibility – Electricity 2026
For historical comparison, the utility-scale battery-to-peak-load ratio in each of California, South Australia, and the United Kingdom was below 5% in 2019. The supplied observations provide this common threshold for all 3 regions and the distinct approximate 2024 values above. They do not provide exact 2019 percentages or a more detailed intervening annual series, so the comparison is limited to those stated points. Source: IEA, Flexibility – Electricity 2026
| Region | Battery nameplate capacity relative to peak load |
|---|---|
| California, 2019 | Below 5% |
| South Australia, 2019 | Below 5% |
| United Kingdom, 2019 | Below 5% |
| California, 2024 | Almost 25% |
| South Australia, 2024 | Around 15% |
| United Kingdom, 2024 | Around 15% |
grid scale battery capacity: California fleet capacity and survey scope
The California Energy Storage System Survey’s statewide narrative reports battery storage capacity of less than 700 MW at the beginning of 2019 and more than 23,000 MW by mid-2026. The survey says its data was current through September 18, 2026. Its June 2026 statewide total introduced a scope change: it includes out-of-state utility-scale battery resources serving CAISO customers. That boundary matters when interpreting the mid-2026 endpoint against earlier totals. Source: California Energy Commission, California Energy Storage System Survey
The survey covers reported storage systems with capacities as low as 5 kW and includes residential, commercial, and utility-scale installations. Its fleet context is therefore broader than the IEA’s grid-scale-only battery-to-peak-load ratio. The CEC endpoints and the IEA ratio answer different questions: one describes reported statewide battery capacity under the survey’s scope, while the other relates grid-scale battery nameplate capacity to peak load. The stated scope and date should accompany either figure when it is reused. Source: California Energy Commission, California Energy Storage System Survey