Table 4.8.A. Capacity Factors for Utility Scale Generators Primarily Using Fossil Fuels, January 2013-December 2017

  Coal Natural Gas Petroleum
Period
Natural Gas Fired Combined Cycle Natural Gas Fired Combustion Turbine Steam Turbine Internal Combustion Engine Steam Turbine
Petroleum Liquids Fired Combustion Turbine
Internal Combustion Engine
Annual Factors
2013 59.8% 48.2% 4.9% 10.6% 6.1% 12.1% 0.8% 2.2%
2014 61.1% 48.3% 5.2% 10.4% 8.5% 12.5% 1.1% 1.4%
2015 54.7% 55.9% 6.9% 11.5% 8.9% 13.3% 1.1% 2.2%
2016 53.3% 55.5% 8.3% 12.4% 9.6% 11.5% 1.1% 2.6%
2017 53.7% 51.3% 6.7% 10.5% 9.9% 13.5% 0.9% 2.3%
Year 2015
January 61.4% 52.6% 4.4% 7.6% 5.2% 12.4% 0.6% 2.5%
February 65.0% 52.2% 6.2% 9.9% 5.7% 22.8% 1.9% 3.1%
March 50.3% 50.7% 5.2% 8.3% 8.5% 7.9% 0.6% 1.9%
April 43.3% 47.9% 5.7% 9.4% 6.6% 12.0% 0.9% 2.2%
May 49.9% 50.2% 6.7% 9.3% 8.7% 12.6% 1.1% 2.0%
June 62.6% 61.5% 8.3% 13.7% 11.2% 12.0% 1.0% 2.0%
July 66.8% 67.2% 10.7% 19.4% 12.3% 15.5% 1.3% 2.4%
August 64.9% 66.9% 8.9% 19.0% 12.3% 14.8% 1.2% 2.4%
September 58.7% 61.4% 8.2% 14.2% 9.8% 15.9% 1.2% 2.1%
October 47.0% 53.6% 6.7% 10.5% 8.1% 14.5% 1.0% 2.1%
November 44.0% 50.9% 7.0% 8.4% 8.6% 10.5% 1.9% 1.8%
December 43.6% 54.6% 5.0% 8.5% 8.5% 9.7% 1.1% 2.0%
Year 2016
January 56.4% 56.4% 5.0% 7.1% 9.5% 10.1% 0.6% 3.1%
February 49.1% 53.6% 5.0% 7.4% 8.6% 10.6% 0.7% 2.8%
March 36.0% 50.2% 7.1% 10.2% 8.9% 8.9% 1.1% 2.2%
April 37.8% 47.6% 8.3% 11.7% 9.2% 9.7% 0.8% 2.1%
May 41.6% 52.5% 7.6% 12.3% 9.3% 11.4% 1.1% 2.5%
June 61.2% 63.9% 9.9% 17.5% 10.3% 13.3% 1.3% 2.1%
July 69.8% 68.2% 13.7% 23.1% 11.7% 16.9% 2.1% 2.1%
August 69.3% 70.8% 13.8% 21.1% 12.7% 15.1% 2.6% 2.3%
September 60.4% 60.7% 9.5% 14.6% 10.3% 12.9% 1.2% 2.3%
October 50.8% 47.8% 7.8% 11.4% 8.0% 8.8% 0.9% 2.4%
November 46.2% 46.3% 6.8% 6.5% 7.9% 9.9% 0.7% 2.8%
December 61.2% 47.5% 5.1% 5.4% 8.3% 10.1% 0.5% 4.0%
Year 2017
January 59.9% 46.7% 5.3% 4.3% 9.2% 11.6% 0.7% 3.0%
February 49.7% 44.4% 5.4% 3.8% 7.9% 10.3% 0.8% 2.4%
March 46.3% 44.8% 6.5% 7.2% 7.8% 13.0% 0.8% 2.7%
April 43.6% 42.5% 5.6% 8.7% 8.0% 10.1% 0.6% 1.9%
May 48.4% 45.8% 6.0% 9.1% 8.2% 15.9% 0.8% 2.0%
June 58.5% 56.0% 7.3% 14.1% 10.3% 15.8% 0.8% 2.0%
July 67.1% 67.0% 9.1% 20.8% 13.0% 18.5% 0.9% 2.1%
August 62.9% 65.5% 8.0% 16.1% 12.3% 14.9% 0.9% 2.3%
September 53.8% 55.7% 7.8% 13.3% 10.9% 14.2% 1.1% 2.3%
October 47.5% 48.2% 6.6% 12.4% 10.2% 11.7% 0.9% 2.1%
November 49.3% 45.6% 5.8% 7.0% 10.1% 12.3% 0.7% 2.1%
December 56.2% 52.3% 6.4% 8.5% 10.3% 14.3% 1.4% 2.4%

Values are final.
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.'