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Electric Power Monthly

Data for August 2025 Release Date: October 24, 2025 Next Release Date: November 25, 2025 Full report PDF
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Table 6.07.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%
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%
Sept 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%
Sept 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 26,987.4 7.8% 23,156.6 9.8%
February 27,343.6 7.8% 23,156.6 10.4%
March 27,877.5 8.5% 23,156.6 8.8%
April 28,859.9 8.7% 23,156.6 9.7%
May 30,183.4 8.8% 23,156.6 11.7%
June 31,744.3 8.2% 23,156.6 15.9%
July 33,030.1 8.7% 23,156.6 18.5%
August 34,703.2 10.3% 23,156.6 15.1%

Values for 2024 and prior years are final. Values for 2025 are preliminary.
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.'