Electric Power Monthly

Data for December 2014  |  Release Date: March 4, 2015  |  Next Release: March 24, 2015 
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Table 6.7.B. Capacity Factors for Utility Scale Generators Not Primarily Using Fossil Fuels, January 2008-December 2014

Period Nuclear Conventional Hydropower Wind Solar Photovoltaic Solar Thermal Landfill Gas and Muncipal Solid Waste Other Biomass Including Wood Geothermal
Annual Factors
2008 91.1% 37.2% 31.7% NA NA 69.9% 66.5% 74.7%
2009 90.3% 39.6% 28.1% NA NA 70.2% 62.1% 73.3%
2010 91.1% 37.6% 29.8% NA NA 70.8% 57.8% 71.9%
2011 89.1% 45.9% 32.1% NA NA 70.0% 56.3% 71.8%
2012 86.1% 39.6% 31.8% NA NA 68.0% 57.3% 68.2%
2013 90.8% 38.9% 32.4% NA NA 69.2% 56.8% 73.6%
2014 91.7% 37.5% 33.9% 27.8% 19.5% 68.9% 52.1% 68.8%
2012
January 95.8% 39.0% 39.0% NA NA 65.8% 60.1% 67.4%
February 90.3% 36.6% 33.5% NA NA 66.0% 60.1% 68.2%
March 81.7% 43.8% 39.0% NA NA 65.9% 55.1% 66.9%
April 76.4% 46.0% 36.5% NA NA 66.7% 47.5% 67.6%
May 82.1% 48.5% 34.5% NA NA 68.1% 51.7% 67.7%
June 89.0% 46.7% 33.6% NA NA 69.9% 59.8% 67.6%
July 91.3% 45.0% 23.6% NA NA 70.8% 61.6% 67.7%
August 91.8% 38.9% 22.4% NA NA 68.7% 63.2% 66.8%
Sept 88.0% 30.8% 23.8% NA NA 67.7% 59.4% 68.9%
October 78.8% 27.9% 32.6% NA NA 67.3% 54.1% 68.1%
November 77.3% 32.6% 30.0% NA NA 68.7% 57.1% 70.8%
December 90.5% 38.8% 34.1% NA NA 70.7% 57.7% 70.6%
2013
January 96.8% 42.2% 33.5% NA NA 66.9% 56.8% 77.0%
February 92.2% 38.3% 35.4% NA NA 65.7% 56.3% 76.2%
March 85.1% 34.8% 35.9% NA NA 69.5% 55.7% 76.8%
April 79.2% 44.3% 41.2% NA NA 67.4% 44.7% 73.4%
May 85.1% 48.4% 37.0% NA NA 70.6% 50.5% 71.7%
June 93.1% 48.2% 32.4% NA NA 71.2% 54.9% 72.5%
July 95.6% 46.7% 25.3% NA NA 71.3% 58.4% 73.5%
August 96.7% 37.1% 22.0% NA NA 72.1% 64.9% 72.7%
Sept 92.2% 29.9% 27.5% NA NA 69.6% 61.2% 73.8%
October 85.7% 29.2% 31.1% NA NA 66.8% 57.9% 74.8%
November 91.0% 31.1% 37.0% NA NA 69.6% 61.0% 68.7%
December 96.6% 35.9% 31.3% NA NA 69.4% 58.7% 72.9%
2014
January 99.0% 36.3% 40.4% NA NA 63.5% 56.5% 67.9%
February 93.9% 32.5% 34.5% NA NA 61.4% 55.6% 67.3%
March 84.4% 41.3% 39.6% NA NA 69.2% 53.2% 67.6%
April 78.8% 44.6% 43.2% NA NA 68.9% 39.1% 68.7%
May 85.2% 45.3% 34.5% NA NA 70.9% 42.4% 68.4%
June 95.4% 45.8% 36.1% NA NA 70.4% 56.1% 68.7%
July 97.4% 41.9% 26.7% NA NA 72.3% 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% 68.4% 51.2% 69.1%
November 91.2% 33.0% 42.3% 23.4% 13.4% 71.4% 54.1% 72.2%
December 99.5% 38.4% 30.4% 15.6% 5.5% 68.3% 52.6% 70.4%

Values for 2013 and prior years are final. Values for 2014 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.'