Battery energy storage links electricity supply with changing demand by storing energy or delivering grid services. The statistics below distinguish power capacity in MW or GW from energy capacity in MWh, and separate observed data from estimates, surveys, plans and scenario forecasts.
Key Battery Energy Storage Statistics
These highlights summarize the most useful battery energy storage figures across global and U.S. data:
- In the IEA Net Zero Emissions by 2050 scenario, battery storage rises 14-fold to 1,200 GW globally by 2030.
- In the IEA scenario, batteries provide 90% of the increase in global storage capacity to 2030.
- The IEA says global energy storage capacity must reach 1,500 GW by 2030 to support the COP28 renewable-capacity goal.
- In 2024, the United States added 10.4 GW of utility-scale battery storage.
- At the end of 2024, U.S. cumulative utility-scale battery storage capacity exceeded 26 GW.
- In 2024, utility-scale batteries represented 2% of the United States’ 1,230 GW of utility-scale generating capacity.
- At the end of 2022, U.S. utility-scale BESS had 8,842 MW of power capacity and 11,105 MWh of energy capacity.
- In 2022, California held 54% of U.S. utility-scale BESS power capacity, equal to 4,738 MW.
- In 2022, California produced 72% of U.S. utility-scale BESS gross generation, equal to 2,086,196 MWh.
- In 2021, frequency regulation was reported for 128 U.S. utility-scale battery generators, representing 63% of power capacity.
- In 2024, arbitrage was included among the uses of 66% of U.S. utility-scale battery capacity.
- At the end of 2024, CAISO reported 11.7 GW of battery capacity, with 43% primarily used for arbitrage.
- In 2021, U.S. small-scale batteries under 1 MW totaled 1,094 MW across utilities in 42 states.
- In 2021, residential small-scale batteries accounted for 740 MW in the United States.
- In 2024, BESS represented 15% of global battery demand, while electric vehicles represented around 75%.
- Global lithium-ion battery prices fell about 30% between 2020 and 2024.
- Global battery-storage investment was set to exceed $50 billion in 2024, according to an IEA estimate.
- NREL’s U.S. storage framework assigns zero to more than 250 GW of potential to multiday-to-seasonal storage longer than 12 hours.
Contents
- Global battery energy storage scale and 2030 outlook
- U.S. battery storage capacity and regional concentration
- Battery storage applications and grid services
- Small-scale and behind-the-meter battery storage
- Battery market composition, chemistry and investment
- Battery storage costs, duration and deployment estimates
Global Battery Energy Storage Scale and 2030 Outlook
The IEA’s outlook describes a major expansion, but its figures are scenario requirements and forecasts rather than completed installations. In the Net Zero Emissions by 2050 scenario, battery storage rises 14-fold to 1,200 GW by 2030, and batteries provide 90% of the increase in storage capacity to that date. IEA, “Outlook for battery demand and supply – Batteries and Secure Energy Transitions”
The same IEA scenario says global energy storage capacity must increase sixfold to 1,500 GW by 2030 to support the COP28 renewable-capacity goal. That 1,500 GW figure covers the scenario’s storage requirement, while the 1,200 GW figure is specifically battery storage.
Innovation could reduce total power-sector battery-storage capital costs by up to 40% by 2030 in the IEA Stated Policies Scenario. This is an upper-bound scenario estimate, not a guaranteed reduction in every project or market. IEA, “Outlook for battery demand and supply – Batteries and Secure Energy Transitions”
U.S. Battery Storage Capacity and Regional Concentration
The United States added 10.4 GW of utility-scale battery storage capacity in 2024, taking cumulative utility-scale capacity above 26 GW. EIA describes the underlying generator-inventory figures as preliminary, and the category is utility-scale rather than every household or small commercial battery. EIA, “U.S. battery capacity increased 66% in 2024”
In 2024, utility-scale battery capacity equaled 2% of the United States’ 1,230 GW of utility-scale generating capacity. This is a power-capacity comparison: batteries are secondary electricity sources, so the percentage should not be read as a share of annual electricity generation.
| U.S. utility-scale battery measure | Period | Reported figure |
|---|---|---|
| Power capacity | End of 2022 | 8,842 MW |
| Energy capacity | End of 2022 | 11,105 MWh |
| Gross generation | 2022 | 2,913,805 MWh |
| Planned new capacity | 2025 | 19.6 GW |
The end-of-2022 power and energy capacities apply to facilities of at least 1 MW. Gross generation is not a simple net-supply measure because charging and round-trip losses are not represented that way. EIA, “Energy storage for electricity generation”
Regional concentration was pronounced in 2022:
- California held 4,738 MW, or 54%, of U.S. utility-scale BESS power capacity, and generated 2,086,196 MWh, or 72%, of gross generation.
- Texas held 2,087 MW, or 24%, of power capacity, and generated 268,209 MWh, or 9%, of gross generation.
- Florida held 538 MW, or 6%, of power capacity, and generated 203,606 MWh, or 7%, of gross generation.
California, Texas and Florida together accounted for 83% of U.S. utility-scale BESS power capacity and 80% of energy capacity in 2022. These state figures use EIA’s utility-scale definition and are not a complete measure of distributed storage. EIA, “Energy storage for electricity generation”
At the end of 2023, utilities reported 575 operating batteries with 15,814 MW of collective capacity. They also reported plans to add 35,953 MW by the end of 2028, which remains a plan-based estimate rather than completed capacity. EIA, “Utilities report batteries are most commonly used for arbitrage and grid stability”
Battery Storage Applications and Grid Services
Battery systems can have several uses at once, so EIA application percentages can exceed 100% when measured across the fleet. The 2021 figures below describe any reported use, not mutually exclusive categories.
| Reported use | U.S. utility-scale battery generators in 2021 | Share of power capacity |
|---|---|---|
| Frequency regulation | 128 | 63% |
| Arbitrage | 103 | 58% |
| Ramping or spinning reserve | 64 | 42% |
| Excess solar and wind storage | 148 | 30% |
| Voltage or reactive-power support | 34 | 23% |
| Load management | 62 | 18% |
| Load following | 32 | 10% |
| Peak shaving | 147 | 10% |
| Co-located renewable firming | 38 | 5% |
| Transmission and distribution deferral | 14 | 2% |
| Backup power | 33 | 2% |
Frequency regulation was reported for 128 generators and represented 63% of power capacity in 2021; arbitrage was reported for 103 generators and represented 58%. Excess solar and wind storage appeared for 148 generators, while peak shaving appeared for 147, showing that generator counts and capacity shares answer different questions. EIA, “Energy storage for electricity generation”
In the EIA’s 2023 utility reporting, arbitrage was the primary use for 10,487 MW of U.S. utility battery capacity. In 2024, operator-reported data showed arbitrage included among the uses of 66% of utility-scale battery capacity, while it was the primary use for 41%; frequency regulation was primary for 24%. EIA, “Utilities report batteries are most commonly used for arbitrage and grid stability” EIA, “Utility-scale batteries are more commonly used for price arbitrage”
Market-level data at the end of 2024 showed 11.7 GW of battery capacity in CAISO, with 43% primarily used for arbitrage, and 8.1 GW in ERCOT, with 50% primarily used for arbitrage. These classifications are primary-use shares and should not be compared directly with any-use percentages. EIA, “Utility-scale batteries are more commonly used for price arbitrage”
Small-Scale and Behind-the-Meter Battery Storage
EIA defines small-scale batteries as systems below 1 MW. In 2021, utilities in 42 states reported 1,094 MW of small-scale battery capacity, including customer photovoltaic-associated and directly connected systems; this is not a census of every household battery. EIA, “Energy storage for electricity generation”
| Small-scale category | U.S. capacity in 2021 |
|---|---|
| Residential | 740 MW |
| Commercial | 254 MW |
| Industrial | 79 MW |
| Directly connected systems | 21 MW |
| Net-metered residential systems | 631 MW |
| Non-net-metered commercial systems | 166 MW |
Net-metered systems represented about 71% of U.S. small-scale battery capacity in 2021, which is a capacity share rather than a share of customers. Directly connected systems were in front of an ultimate customer meter, while the residential net-metered figure refers to capacity associated with solar PV systems. EIA, “Energy storage for electricity generation”
Co-location also connects storage with renewable generation. In 2022, 207 U.S. BESS plants were co-located with renewable generators, including 14 with wind projects; nearly all remaining co-located plants were with solar PV, and these are plant counts rather than capacity totals. EIA, “Energy storage for electricity generation”
Battery Market Composition, Chemistry and Investment
The global battery market was worth about $130 billion in 2024, according to an IEA estimate covering batteries broadly rather than BESS alone. Electric vehicles represented around 75% of global battery demand, BESS represented 15%, and portable electronics represented 5% in that year. IEA, “How can innovation help secure future battery markets and mineral supplies?”
The chemistry comparison in the same IEA material concerns EV batteries: LFP and NMC each accounted for roughly half of global EV-battery demand in 2024. That split must not be relabeled as the chemistry mix of all stationary storage.
Global lithium-ion battery prices fell about 30% between 2020 and 2024. The figure is an average market price trend; chemistry, configuration and project-level costs can differ. IEA, “How can innovation help secure future battery markets and mineral supplies?”
Battery-storage investment was set to exceed $50 billion globally in 2024, an IEA estimate rather than final audited expenditure. Investment was geographically concentrated: in 2023, for every dollar invested in battery storage in advanced economies and China, only one cent was invested in other emerging market and developing economies. IEA, “Overview and key findings – World Energy Investment 2024”
Battery Storage Costs, Duration and Deployment Estimates
Power capacity describes how quickly a system can deliver or absorb electricity; energy capacity describes how much energy it can store. That distinction matters when comparing the 2024 U.S. additions in GW with the 2022 EIA energy-capacity total in MWh.
NREL’s Storage Futures Study baseline put U.S. stationary energy storage at about 24 GW, with most of that baseline in pumped-storage hydropower. The estimate includes all stationary storage, not batteries alone. NREL, “The Four Phases of Storage Deployment”
NREL’s Phase 1 framework assigns less than 30 GW of U.S. national deployment potential to sub-1-hour storage providing operating reserves with millisecond-to-second response speed. This is a conceptual deployment-potential range, not an installed-capacity forecast.
At the other end of the duration spectrum, NREL’s Phase 4 framework assigns zero to more than 250 GW of potential U.S. multiday-to-seasonal storage. The category is defined as longer than 12 hours with minute-scale response, and the range explicitly spans zero to more than 250 GW rather than predicting realized deployment. NREL, “The Four Phases of Storage Deployment”