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Electric Power Annual

With Data for 2024 Release Date: October 16, 2025 Next Release: October 2026 full report PDF
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SAS Output
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
2014 155.1 1.7% 22,477.9 10.2%
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 2022
January 4,926.4 5.5% 23,013.4 9.5%
February 4,996.7 6.6% 23,013.4 8.9%
March 5,069.2 5.7% 23,013.4 9.1%
April 5,316.2 6.0% 23,013.4 7.3%
May 6,055.5 6.4% 23,043.9 10.9%
June 6,064.5 7.1% 23,043.9 14.8%
July 6,555.2 6.9% 23,043.9 15.9%
August 6,941.6 6.6% 23,043.9 16.4%
September 7,469.9 6.1% 23,043.9 13.2%
October 7,958.4 6.7% 23,043.9 8.4%
November 8,630.7 6.7% 23,043.9 9.2%
December 8,696.4 6.5% 23,043.9 9.6%
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%

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.'