Electric Power Monthly

Data for May 2015  |  Release Date: July 27, 2015  |  Next Release: August 25, 2015 
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Table 6.7.B. Capacity Factors for Utility Scale Generators Not Primarily Using Fossil Fuels, January 2013-May 2015

Period Nuclear Conventional Hydropower Wind Solar Photovoltaic Solar Thermal Landfill Gas and Muncipal Solid Waste Other Biomass Including Wood Geothermal
Annual Factors
2013 89.9% 38.9% 32.4% NA NA 68.9% 56.7% 73.6%
2014 91.7% 37.5% 33.9% 27.8% 19.5% 68.9% 52.1% 68.8%
2013
January 93.9% 42.3% 33.5% NA NA 66.0% 56.5% 76.9%
February 90.3% 38.3% 35.4% NA NA 65.2% 56.0% 76.1%
March 83.4% 34.8% 35.9% NA NA 69.0% 55.4% 76.8%
April 77.6% 44.4% 41.1% NA NA 66.9% 44.8% 73.3%
May 83.3% 48.4% 37.0% NA NA 70.4% 50.5% 71.7%
June 93.1% 48.3% 32.4% NA NA 71.0% 54.8% 72.4%
July 95.6% 46.8% 25.3% NA NA 71.1% 58.2% 73.3%
August 96.7% 37.2% 22.0% NA NA 71.9% 64.8% 72.5%
Sept 92.2% 29.9% 27.4% NA NA 69.4% 61.1% 73.6%
October 85.7% 29.2% 31.0% NA NA 66.6% 57.9% 74.7%
November 91.0% 31.1% 37.0% NA NA 69.5% 61.0% 68.8%
December 96.6% 35.9% 31.3% NA NA 69.9% 59.0% 73.0%
2014
January 99.0% 36.3% 40.4% NA NA 63.6% 56.8% 67.9%
February 93.9% 32.5% 34.4% NA NA 61.4% 55.7% 67.3%
March 84.5% 41.3% 39.6% NA NA 69.2% 53.3% 67.6%
April 78.9% 44.6% 43.1% NA NA 68.9% 39.1% 68.7%
May 85.3% 45.3% 34.5% NA NA 70.9% 42.4% 68.4%
June 95.4% 45.8% 36.1% NA NA 70.5% 56.1% 68.7%
July 97.4% 41.9% 26.7% NA NA 72.4% 56.0% 67.8%
August 96.3% 33.9% 22.5% 31.9% 25.0% 72.0% 56.0% 68.0%
Sept 94.5% 28.0% 26.0% 32.0% 25.9% 69.7% 52.3% 69.3%
October 84.5% 29.0% 31.5% 26.7% 20.8% 68.5% 51.3% 69.1%
November 91.2% 33.0% 42.2% 23.4% 13.4% 71.4% 54.1% 72.2%
December 99.5% 38.4% 30.4% 15.6% 5.5% 68.4% 52.6% 70.4%
2015
January 101.2% 41.9% 31.4% NA NA 67.4% 46.0% 74.1%
February 95.8% 43.0% 34.2% NA NA 62.1% 55.6% 73.4%
March 87.9% 42.2% 31.5% NA NA 58.9% 49.0% 74.2%
April 84.1% 39.5% 37.6% NA NA 65.5% 40.8% 70.8%
May 89.7% 34.3% 35.0% NA NA 67.3% 46.4% 74.4%

Values for 2013 and prior years are final. Values for 2014 and 2015 are preliminary. NA = Not Available
Notes: Solar Thermal Capacity Factors include generation from plants using concentrated solar power energy storage.
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.'