Table 3.25. Useful Thermal Output by Energy Source: Commercial Sector Combined Heat and Power, 2013 - 2023
(Billion Btus)

Period Coal Petroleum
Liquids
Petroleum
Coke
Natural
Gas
Other
Fossil
Gas
Renewable
Sources
Other Total
Annual Totals
2013 10,942 1,017 222 27,562 0 7,054 5,693 52,489
2014 11,081 820 327 26,876 0 7,610 5,123 51,837
2015 7,966 823 325 26,498 0 8,228 5,641 49,482
2016 8,313 924 140 57,356 0 11,017 5,381 83,131
2017 7,360 806 234 71,149 0 10,762 5,140 95,450
2018 6,943 1,020 165 58,312 0 10,902 4,918 82,260
2019 6,211 1,346 95 56,356 0 8,307 3,335 75,650
2020 5,446 692 50 55,508 0 6,929 2,863 71,489
2021 5,975 820 88 50,047 0 6,377 2,825 66,132
2022 5,996 1,165 212 52,264 0 9,263 6,333 75,235
2023 4,334 908 50 49,140 0 8,717 6,303 69,453
Year 2021
January 615 89 0 4,916 0 566 255 6,441
February 723 177 14 4,406 0 538 180 6,037
March 576 71 1 4,208 0 542 224 5,622
April 435 53 0 3,528 0 445 225 4,686
May 370 68 0 3,431 0 408 241 4,518
June 371 41 0 3,989 0 531 225 5,156
July 393 51 0 4,422 0 601 286 5,754
August 436 44 0 4,699 0 611 268 6,057
September 487 42 0 3,933 0 594 252 5,308
October 491 47 18 4,002 0 475 219 5,252
November 538 58 28 4,097 0 476 198 5,394
December 539 81 27 4,417 0 589 251 5,905
Year 2022
January 682 303 27 5,178 0 834 561 7,584
February 652 81 25 4,604 0 761 485 6,606
March 438 97 27 4,509 0 745 487 6,303
April 298 75 23 4,035 0 663 483 5,576
May 304 75 29 3,921 0 779 542 5,651
June 428 38 26 4,061 0 865 557 5,975
July 487 68 19 4,727 0 848 591 6,738
August 496 60 0 4,787 0 878 591 6,812
September 503 29 5 4,021 0 743 537 5,838
October 499 37 0 3,770 0 665 475 5,447
November 571 48 11 3,980 0 781 560 5,951
December 639 255 21 4,671 0 702 465 6,752
Year 2023
January 557 133 22 4,466 0 755 493 6,426
February 483 99 5 4,077 0 661 492 5,816
March 439 65 3 4,168 0 748 526 5,949
April 382 26 0 3,614 0 672 502 5,195
May 287 29 0 3,654 0 668 570 5,207
June 263 43 0 3,845 0 739 498 5,387
July 280 40 0 4,416 0 691 543 5,970
August 295 36 0 4,200 0 787 579 5,898
September 296 42 0 4,060 0 770 520 5,689
October 268 40 0 3,939 0 660 430 5,336
November 359 74 0 4,273 0 731 547 5,984
December 425 282 20 4,428 0 836 604 6,595

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 Fossil Gas.
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 Fossil Gas.
Petroleum Coke includes petroleum coke-derived synthesis gas. Prior to 2011, petroleum coke-derived synthesis gas was included in Other Fossil Gas.
Other Fossil Gas includes gaseous propane, blast furnace gas, other manufactured and waste gases derived from fossil fuels other than hydrogen. Prior to 2011, Other Fossil 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 hydrogen, non-biogenic municipal solid waste, batteries, 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.