U.S. Energy Information Administration logo
Skip to sub-navigation

Electric Power Monthly

Data for September 2021 Release Date: November 24, 2021 Next Release Date: December 23, 2021 full reportPDF
SAS Output
Table 6.07.C. Usage Factors for Utility Scale Storage Generators

  Battery Pumped Storage
Year/Month Time Adjusted Capacity Usage Factor Time Adjusted Capacity Usage Factor
Annual Data
2013 126.7 0.7% 22,389.3 9.8%
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%
Year 2019
January 864.8 5.5% 22,721.3 9.3%
February 877.1 5.7% 22,721.3 9.2%
March 901.9 6.3% 22,721.3 8.3%
April 931.0 5.9% 22,721.3 10.2%
May 934.7 5.9% 22,721.3 11.8%
June 939.7 5.2% 22,778.3 11.7%
July 962.9 5.2% 22,778.3 15.1%
August 983.9 5.0% 22,778.3 13.7%
Sept 990.8 5.8% 22,778.3 12.4%
October 998.7 4.5% 22,778.3 8.3%
November 1,001.2 5.2% 22,778.3 7.2%
December 1,006.2 5.0% 22,778.3 7.8%
Year 2020
January 1,023.4 5.3% 22,917.9 9.0%
February 1,038.8 5.7% 22,917.9 9.1%
March 1,052.5 6.3% 22,917.9 7.9%
April 1,077.2 5.6% 22,917.9 8.2%
May 1,093.1 5.3% 22,917.9 10.8%
June 1,106.9 5.4% 22,917.9 13.4%
July 1,110.5 5.3% 22,917.9 15.9%
August 1,363.8 4.7% 22,917.9 15.0%
Sept 1,395.5 5.0% 22,917.9 11.6%
October 1,395.5 4.8% 22,997.9 8.4%
November 1,419.8 5.0% 22,997.9 7.6%
December 1,440.6 4.6% 23,016.2 8.6%
Year 2021
January 1,508.2 3.2% 23,016.2 8.1%
February 1,646.2 4.8% 23,016.2 9.0%
March 1,657.7 4.6% 23,016.2 7.4%
April 1,784.5 4.3% 23,016.2 7.2%
May 1,958.8 5.3% 23,016.2 8.7%
June 2,387.5 5.6% 23,019.2 12.4%
July 2,659.9 4.8% 23,019.2 15.2%
August 2,895.9 5.1% 23,019.2 15.9%
Sept 3,084.4 4.7% 23,019.2 12.7%

Values for 2020 and prior years are final. Values for 2021 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.'