Electric Power Annual
With Data for 2025
Release Date:
October 21, 2026
Next Release:
October 2027
| Table 4.08.C. Usage Factors for Utility Scale Storage Generators |
| Battery | Pumped Storage | |||
|---|---|---|---|---|
| Year/Month | Time Adjusted Capacity (MW) | Usage Factor | Time Adjusted Capacity (MW) | Usage Factor |
| Annual Data | ||||
| 2015 | 206.8 | 3.6% | 22,568.9 | 10.2% |
| 2016 | 423.0 | 3.8% | 22,752.7 | 11.2% |
| 2017 | 632.8 | 6.8% | 22,791.7 | 11.4% |
| 2018 | 713.6 | 5.2% | 22,815.4 | 10.8% |
| 2019 | 949.8 | 5.4% | 22,754.7 | 10.4% |
| 2020 | 1,210.3 | 5.2% | 22,939.6 | 10.5% |
| 2021 | 2,627.6 | 6.1% | 23,007.7 | 10.2% |
| 2022 | 6,566.1 | 6.4% | 23,033.9 | 11.1% |
| 2023 | 11,225.7 | 6.6% | 23,132.1 | 10.9% |
| 2024 | 19,945.1 | 8.3% | 23,178.5 | 11.4% |
| 2025 | 33,085.2 | 9.0% | 23,035.1 | 12.0% |
| Year 2023 | ||||
| January | 9,168.7 | 6.9% | 23,057.8 | 9.2% |
| February | 9,236.4 | 6.5% | 23,057.8 | 9.6% |
| March | 9,318.4 | 7.0% | 23,137.8 | 9.2% |
| April | 9,621.5 | 7.2% | 23,147.4 | 8.8% |
| May | 9,791.5 | 6.5% | 23,147.4 | 10.9% |
| June | 9,943.1 | 6.4% | 23,147.4 | 13.8% |
| July | 10,846.6 | 6.5% | 23,147.4 | 15.7% |
| August | 12,332.2 | 6.4% | 23,147.4 | 15.5% |
| September | 12,815.4 | 6.3% | 23,147.4 | 13.3% |
| October | 13,515.9 | 7.0% | 23,147.4 | 8.7% |
| November | 13,768.3 | 6.7% | 23,147.4 | 8.3% |
| December | 14,197.9 | 6.3% | 23,147.4 | 8.0% |
| Year 2024 | ||||
| January | 15,989.6 | 6.2% | 23,118.6 | 9.5% |
| February | 16,276.4 | 7.3% | 23,118.6 | 9.7% |
| March | 16,312.3 | 7.9% | 23,198.6 | 7.4% |
| April | 17,352.7 | 8.4% | 23,198.6 | 9.1% |
| May | 18,040.6 | 8.0% | 23,198.6 | 12.5% |
| June | 19,187.2 | 8.1% | 23,198.6 | 15.6% |
| July | 20,434.9 | 8.8% | 23,198.6 | 16.8% |
| August | 21,174.1 | 9.0% | 23,198.6 | 16.3% |
| September | 22,411.1 | 8.3% | 23,198.6 | 13.0% |
| October | 23,219.6 | 9.0% | 23,198.6 | 8.3% |
| November | 23,981.5 | 8.8% | 23,156.6 | 8.7% |
| December | 24,826.7 | 8.6% | 23,156.6 | 9.4% |
| Year 2025 | ||||
| January | 27,054.9 | 8.5% | 23,035.1 | 9.8% |
| February | 27,401.0 | 8.6% | 23,035.1 | 10.5% |
| March | 27,934.9 | 9.3% | 23,035.1 | 9.0% |
| April | 28,956.0 | 9.4% | 23,035.1 | 9.8% |
| May | 30,279.5 | 9.6% | 23,035.1 | 11.7% |
| June | 32,088.4 | 8.9% | 23,035.1 | 16.0% |
| July | 33,782.1 | 9.4% | 23,035.1 | 18.6% |
| August | 35,455.2 | 10.1% | 23,035.1 | 15.4% |
| September | 36,502.1 | 9.5% | 23,035.1 | 13.6% |
| October | 37,500.4 | 8.7% | 23,035.1 | 10.1% |
| November | 39,177.2 | 8.1% | 23,035.1 | 9.0% |
| December | 40,481.9 | 7.9% | 23,035.1 | 10.4% |
| Values are final. Time adjusted capacity for month rows is the summer capacity of generators in operation for the entire month; units that began operation during the month or that retired during the month are excluded. Time adjusted capacity for year rows is a time weighted average of the month rows. Usage factors are a comparison of gross generation with available capacity. See the technical note for an explanation of how usage factors are calculated. Sources: U.S. Energy Information Administration, Form EIA-923, Power Plant Operations Report; U.S. Energy Information Administration, Form EIA-860, 'Annual Electric Generator Report' and Form EIA-860M, 'Monthly Update to the Annual Electric Generator Report.' |