Table 3.24. Useful Thermal Output by Energy Source: Electric Power Sector Combined Heat and Power, 2007 - 2017
(Billion Btus)

Period Coal Petroleum
Liquids
Petroleum
Coke
Natural
Gas
Other
Gas
Renewable
Sources
Other Total
Annual Totals
2007 38,260 5,294 1,862 212,705 20,473 19,166 4,459 302,219
2008 37,220 5,479 1,353 204,167 22,109 17,052 4,854 292,234
2009 38,015 5,341 1,445 190,875 19,830 17,625 5,055 278,187
2010 38,325 4,702 1,108 186,772 19,707 17,589 5,040 273,244
2011 35,209 4,484 1,231 190,712 20,435 16,029 6,044 274,143
2012 26,093 4,405 1,246 200,294 20,948 16,369 5,545 274,900
2013 21,306 4,614 993 188,094 10,303 16,225 4,966 246,501
2014 15,513 4,931 936 182,148 7,732 17,736 5,666 234,662
2015 16,036 4,894 1,143 178,167 7,161 16,999 5,180 229,580
2016 13,922 695 1,237 227,427 17,400 24,993 8,046 293,719
2017 11,269 627 1,267 192,316 17,798 24,279 7,422 254,978
Year 2015
January 1,509 374 103 15,756 761 1,747 461 20,711
February 1,438 625 89 14,177 630 1,520 363 18,844
March 1,506 379 92 15,187 453 1,577 421 19,615
April 1,182 355 98 13,590 449 1,348 374 17,397
May 1,436 364 99 13,998 483 863 397 17,641
June 1,339 355 91 14,474 477 1,268 445 18,448
July 1,429 425 94 15,923 428 1,391 446 20,136
August 1,365 393 92 15,895 549 1,369 481 20,145
September 1,260 402 89 15,489 624 1,314 438 19,615
October 1,230 441 87 14,721 747 1,417 389 19,031
November 1,143 381 100 14,187 742 1,558 476 18,586
December 1,201 400 109 14,769 818 1,627 487 19,411
Year 2016
January 1,453 69 116 20,662 1,435 2,335 701 26,770
February 1,382 118 111 18,705 1,261 2,381 724 24,682
March 1,261 82 120 19,582 1,629 2,406 755 25,835
April 1,077 44 74 17,200 1,281 2,193 658 22,526
May 946 48 73 18,626 1,262 1,923 662 23,540
June 980 34 94 19,116 1,412 1,840 691 24,166
July 1,222 35 101 20,428 1,469 1,966 705 25,925
August 1,124 42 107 21,332 1,540 1,869 722 26,737
September 993 36 105 18,880 1,573 1,795 572 23,954
October 1,104 51 115 17,131 1,479 1,748 609 22,237
November 1,035 37 108 17,198 1,513 2,207 608 22,708
December 1,344 99 113 18,567 1,547 2,328 641 24,639
Year 2017
January 1,178 102 106 16,869 1,472 2,419 645 22,791
February 1,004 49 104 14,582 1,325 2,102 570 19,735
March 1,047 22 113 16,679 1,465 2,451 641 22,418
April 799 25 109 14,796 1,393 1,788 629 19,539
May 766 32 112 15,041 1,448 1,727 643 19,768
June 797 33 104 16,016 1,446 1,787 645 20,827
July 925 34 104 17,329 1,520 1,893 684 22,490
August 937 28 102 17,119 1,400 1,860 678 22,123
September 872 58 101 15,586 1,536 1,781 577 20,511
October 932 45 105 15,755 1,614 1,989 488 20,928
November 909 64 98 15,338 1,572 2,155 561 20,696
December 1,104 135 109 17,206 1,605 2,329 663 23,151

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.