Table 4.8.B. Capacity Factors for Utility Scale Generators Not Primarily Using Fossil Fuels, January 2013-December 2016

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% 37.3% 34.0% 25.9% 19.8% 68.9% 58.9% 74.0%
2015 92.3% 35.8% 32.2% 25.8% 22.1% 68.7% 55.3% 74.3%
2016 92.3% 38.2% 34.5% 25.1% 22.2% 69.7% 55.6% 73.9%
Year 2014
January 99.1% 36.7% 40.3% NA NA 68.1% 60.0% 74.0%
February 94.0% 32.6% 34.8% NA NA 68.3% 59.5% 73.3%
March 84.5% 40.7% 39.8% NA NA 69.6% 59.7% 73.5%
April 78.8% 44.5% 43.2% NA NA 69.9% 49.5% 74.6%
May 85.2% 44.6% 34.9% NA NA 70.6% 48.2% 73.2%
June 95.4% 44.8% 36.5% NA NA 70.8% 63.0% 73.4%
July 97.5% 41.3% 27.0% NA NA 73.1% 63.4% 72.5%
August 96.4% 33.7% 22.5% 30.9% 25.4% 71.1% 62.8% 73.0%
September 94.6% 28.2% 26.1% 30.7% 26.3% 68.9% 61.2% 74.2%
October 84.5% 29.2% 31.6% 26.5% 21.1% 64.4% 56.5% 73.9%
November 91.3% 32.6% 42.3% 22.3% 13.8% 66.1% 62.1% 77.3%
December 99.6% 37.8% 30.4% 15.1% 5.6% 65.4% 60.8% 75.5%
Year 2015
January 101.3% 40.7% 31.2% 16.8% 5.0% 65.1% 57.2% 75.9%
February 95.8% 41.4% 34.1% 22.1% 14.5% 64.3% 60.0% 76.4%
March 88.0% 40.8% 31.4% 26.7% 22.6% 63.0% 53.4% 76.8%
April 84.3% 39.4% 37.5% 30.9% 30.5% 66.8% 47.3% 72.4%
May 89.8% 33.9% 34.8% 31.2% 27.0% 68.5% 48.4% 76.6%
June 96.4% 35.8% 27.9% 31.7% 32.2% 69.2% 56.7% 74.1%
July 97.3% 35.8% 27.4% 31.4% 31.1% 73.1% 59.9% 74.7%
August 98.6% 32.5% 25.8% 31.3% 32.3% 71.5% 61.6% 73.9%
September 93.6% 28.3% 28.1% 26.6% 27.1% 68.8% 56.1% 67.9%
October 82.5% 28.3% 31.6% 22.8% 16.5% 68.3% 48.8% 72.4%
November 84.8% 33.8% 39.0% 20.7% 16.9% 72.4% 55.8% 75.4%
December 94.9% 39.4% 37.4% 17.5% 9.5% 73.0% 58.3% 75.3%
Year 2016
January 98.5% 43.6% 33.9% 15.2% 6.8% 68.3% 58.5% 73.4%
February 95.3% 43.8% 39.6% 22.9% 19.5% 67.6% 61.2% 73.2%
March 89.9% 45.9% 40.2% 24.9% 19.6% 67.2% 55.8% 72.5%
April 88.1% 44.6% 39.3% 27.2% 20.9% 69.3% 45.8% 68.8%
May 90.5% 42.8% 34.2% 30.2% 28.9% 72.9% 47.0% 73.9%
June 94.2% 40.6% 30.5% 30.3% 33.5% 72.0% 54.7% 71.2%
July 94.5% 36.1% 31.9% 31.7% 36.9% 70.9% 59.3% 72.2%
August 96.1% 33.0% 24.5% 31.7% 29.2% 70.3% 63.5% 73.0%
September 90.9% 28.6% 30.4% 28.5% 30.2% 67.9% 58.5% 75.5%
October 81.7% 29.3% 36.4% 24.0% 19.1% 63.8% 48.9% 74.6%
November 90.9% 32.8% 35.3% 20.4% 14.4% 72.6% 54.9% 77.7%
December 96.7% 37.9% 38.8% 16.2% 7.0% 73.4% 59.6% 80.1%

Values are final. 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.'