Table 3.23. Useful Thermal Output by Energy Source: Total Combined Heat and Power (All Sectors), 2008 - 2018
(Billion Btus)

Period Coal Petroleum
Liquids
Petroleum
Coke
Natural
Gas
Other
Gas
Renewable
Sources
Other Total
Annual Totals
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
2016 220,162 8,607 20,122 785,413 148,881 698,858 25,342 1,907,384
2017 193,164 7,922 17,322 789,485 151,579 674,248 23,685 1,857,405
2018 182,373 9,878 16,581 813,127 172,677 663,644 23,169 1,881,448
Year 2016
January 21,767 887 1,437 69,485 12,156 61,034 2,214 168,980
February 19,988 1,183 1,742 63,128 11,095 57,474 2,149 156,760
March 19,348 680 1,609 64,650 13,241 58,071 2,305 159,905
April 16,611 676 1,417 60,432 12,636 54,858 2,115 148,745
May 16,955 760 1,799 63,171 12,648 56,622 1,935 153,892
June 18,196 694 1,885 65,879 12,958 56,133 2,023 157,769
July 19,422 698 1,905 70,075 12,519 57,550 2,179 164,348
August 18,885 570 1,860 71,562 12,770 57,813 2,303 165,764
September 16,674 524 1,326 65,239 12,068 53,760 2,051 151,642
October 16,523 657 1,690 62,957 11,961 55,338 2,002 151,128
November 16,378 623 1,764 61,410 11,932 58,348 1,965 152,420
December 19,413 654 1,688 67,424 12,897 71,855 2,099 176,031
Year 2017
January 19,055 720 1,525 68,635 13,591 59,191 2,181 164,899
February 15,587 494 1,248 61,025 11,816 53,805 1,874 145,848
March 16,988 610 1,617 65,599 12,595 57,856 2,038 157,304
April 15,081 568 1,336 60,483 12,040 53,825 1,948 145,281
May 14,971 539 1,391 62,274 13,346 53,637 1,868 148,026
June 15,501 462 1,576 64,085 12,285 55,874 2,022 151,806
July 15,676 457 1,521 70,083 12,721 57,072 2,032 159,561
August 15,848 447 1,581 68,728 12,505 58,224 2,147 159,481
September 14,580 552 1,281 65,718 12,212 52,154 1,869 148,366
October 16,389 552 1,485 66,078 12,973 55,368 1,811 154,657
November 16,308 1,040 1,398 64,589 12,441 57,071 1,878 154,727
December 17,179 1,480 1,362 72,187 13,054 60,171 2,017 167,450
Year 2018
January 18,956 2,597 1,662 72,379 13,963 58,883 1,994 170,434
February 16,841 708 1,539 64,059 13,591 52,908 1,886 151,532
March 16,639 601 1,390 67,685 14,652 57,112 2,034 160,113
April 14,584 532 1,472 62,177 13,569 53,599 1,838 147,771
May 14,238 567 1,435 63,879 14,587 54,802 1,821 151,330
June 14,229 634 1,370 65,579 14,392 53,137 2,053 151,393
July 14,346 534 1,361 72,049 14,604 56,586 2,017 161,498
August 14,217 532 1,308 71,554 16,097 56,410 2,065 162,182
September 13,791 491 1,245 66,851 13,972 51,546 1,662 149,558
October 13,254 768 1,287 66,578 14,976 54,658 1,877 153,399
November 15,056 914 1,141 68,771 13,821 55,116 1,925 156,745
December 16,223 998 1,371 71,565 14,452 58,887 1,997 165,493

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, as well as 2008-2015. Beginning with the 2016 Form EIA-923 data, the methodology for seperating the fuel used for electricity generation and useful thermal output from CHP plants was updated. This update will apply to the 2016 data and future data years. 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.