Table 3.23. Useful Thermal Output by Energy Source: Total Combined Heat and Power (All Sectors), 2005 - 2015
(Billion Btus)

Period Coal Petroleum
Liquids		 Petroleum
Coke		 Natural
Gas		 Other
Gas		 Renewable
Sources		 Other Total
Annual Totals
2005 341,806 79,362 13,021 624,008 138,469 664,691 41,400 1,902,757
2006 332,548 54,224 24,009 603,288 126,049 689,549 49,308 1,878,973
2007 326,803 50,882 25,373 554,394 116,313 651,230 46,822 1,771,816
2008 315,244 29,554 18,263 509,330 110,680 610,131 23,729 1,616,931
2009 281,557 32,591 20,308 513,002 99,556 546,974 33,287 1,527,276
2010 300,303 19,914 21,448 524,494 91,439 581,310 28,755 1,567,662
2011 286,210 15,230 21,552 535,150 103,615 586,299 31,067 1,579,124
2012 252,605 12,452 24,419 556,945 113,147 580,513 24,571 1,564,653
2013 243,043 12,828 25,224 553,696 103,719 611,443 22,171 1,572,124
2014 232,509 11,990 23,457 545,624 104,868 624,086 21,390 1,563,923
2015 211,030 11,796 21,748 591,749 98,910 626,887 19,729 1,581,849
Year 2013
January 22,527 1,347 2,290 46,795 9,100 53,279 1,887 137,225
February 20,302 1,158 1,850 42,052 8,059 47,778 1,774 122,972
March 21,781 913 2,166 46,138 8,872 51,075 1,972 132,917
April 18,929 975 1,789 44,169 8,493 49,214 1,833 125,403
May 19,531 984 2,151 44,384 8,700 49,408 1,551 126,709
June 19,011 924 2,215 44,436 8,337 49,882 1,824 126,628
July 20,221 887 2,370 49,098 8,886 53,519 1,953 136,934
August 19,643 819 2,691 48,839 8,644 52,218 2,074 134,927
September 18,556 808 2,017 45,755 8,338 48,342 1,898 125,715
October 19,549 888 2,071 45,314 8,378 50,312 1,823 128,335
November 21,524 914 1,615 46,565 8,160 52,107 1,767 132,650
December 21,471 2,213 1,999 50,152 9,751 54,309 1,814 141,708
Year 2014
January 22,969 2,284 1,900 55,295 8,694 53,678 1,670 146,489
February 21,093 1,305 1,687 43,162 7,847 49,183 1,427 125,704
March 22,495 1,162 1,947 45,530 8,700 53,280 1,720 134,833
April 17,984 801 2,149 42,114 8,220 51,553 1,774 124,596
May 18,456 842 2,082 43,071 8,308 50,115 1,683 124,557
June 18,058 845 2,122 42,523 8,626 51,604 1,813 125,592
July 18,908 795 2,147 45,823 8,838 52,903 1,816 131,228
August 18,663 817 2,006 47,255 9,139 53,504 1,891 133,276
September 17,474 685 2,109 44,117 8,852 49,239 1,814 124,291
October 17,413 835 1,417 45,279 8,897 52,054 1,901 127,796
November 18,904 865 1,835 44,308 9,331 51,860 1,818 128,922
December 20,093 754 2,055 47,146 9,415 55,115 2,064 136,641
Year 2015
January 21,115 1,155 1,981 50,138 9,327 56,281 1,661 141,657
February 19,499 2,090 1,905 46,106 7,897 49,871 1,437 128,806
March 19,098 985 2,012 50,343 8,470 52,087 1,631 134,626
April 16,589 873 2,003 46,088 8,189 51,783 1,590 127,116
May 16,985 883 1,878 46,159 7,800 52,304 1,586 127,594
June 16,620 831 1,758 47,704 8,224 51,115 1,683 127,936
July 17,999 873 1,524 52,248 8,551 53,097 1,703 135,996
August 16,970 789 1,626 52,797 8,512 53,028 1,740 135,462
September 16,437 790 1,869 49,599 8,819 50,168 1,681 129,363
October 15,628 905 1,640 50,020 7,731 50,638 1,578 128,140
November 16,832 799 2,015 49,204 7,207 52,039 1,699 129,794
December 17,259 822 1,538 51,343 8,183 54,475 1,739 135,359

Coal includes anthracite, bituminous, subbituminous, lignite, and waste coal; synthetic coal and refined coal; and beginning in 2011, coal-derived synthesis gas. Prior to 2011 coal-derived synthesis gas was included in Other Gases.
Petroleum Liquids includes distillate and residual fuel oils, jet fuel, kerosene, waste oil, and beginning in 2011, propane. Prior to 2011 propane was included in Other Gases.
Petroleum Coke includes petroleum coke-derived synthesis gas. Prior to 2011, petroleum coke-derived synthesis gas was included in Other Gases.
Other Gas includes blast furnace gas and other manufactured and waste gases derived from fossil fuels. Prior to 2011, Other Gas included propane and synthesis gases.
See the Technical Notes for fuel conversion factors.
Renewable Sources include wood, black liquor, other wood waste, biogenic municipal solid waste, landfill gas, sludge waste, agriculture byproducts, other biomass, geothermal, and solar thermal.
Other includes non-biogenic municipal solid waste, batteries, hydrogen, purchased steam, sulfur, tire-derived fuel, and other miscellaneous energy sources.
Notes: Beginning with 2001 data, non-biogenic municipal solid waste and tire-derived fuels are reclassified as non-renewable energy sources and included in Other. Biogenic municipal solid waste is included in Other Renewable Sources.
Beginning with the collection of Form EIA-923 in January 2008, the methodology for separating the fuel used for electricity generation and useful thermal output from combined heat and power plants changed. The new methodology was retroactively applied to 2004-2007. See the Technical Notes (Appendix C) for further information.
See Glossary for definitions. Values are final. See Technical Notes for a discussion of the sample design for the Form EIA-923 and predecessor forms.
Totals may not equal sum of components because of independent rounding. NM=Not meaningful due to large standard error. W=Withheld to avoid disclosure of individual company data.
Sources: U.S. Energy Information Administration, Form EIA-923, Power Plant Operations Report; U.S. Energy Information Administration, Form EIA-906, Power Plant Report; U.S. Energy Information Administration, Form EIA-920 Combined Heat and Power Plant Report; and predecessor forms.
Beginning with 2008 data, the Form EIA-923, Power Plant Operations Report, replaced the following: Form EIA-906, Power Plant Report; Form EIA-920, Combined Heat and Power Plant Report;
Form EIA-423, Monthly Cost and Quality of Fuels for Electric Plants Report; and Federal Energy Regulatory Commission, FERC Form 423, Monthly Report of Cost and Quality of Fuels for Electric Plants.