Table 3.25. Useful Thermal Output by Energy Source: Commercial Sector Combined Heat and Power, 2009 - 2019
(Billion Btus)

Period Coal Petroleum
Liquids
Petroleum
Coke
Natural
Gas
Other
Gas
Renewable
Sources
Other Total
Annual Totals
2009 20,057 1,095 155 25,902 0 8,450 5,761 61,420
2010 19,216 845 216 29,791 13 7,917 5,333 63,330
2011 17,234 687 111 24,848 14 7,433 5,988 56,314
2012 13,992 523 229 27,922 0 7,970 6,426 57,063
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
Year 2017
January 848 133 31 6,820 0 1,141 544 9,516
February 689 85 18 5,777 0 946 447 7,962
March 813 94 27 5,569 0 875 444 7,821
April 529 44 9 4,741 0 843 414 6,580
May 493 40 12 4,952 0 830 408 6,734
June 475 29 8 5,725 0 902 448 7,588
July 572 38 6 6,706 0 889 442 8,654
August 506 37 32 6,700 0 920 446 8,641
September 532 34 30 6,039 0 705 357 7,697
October 476 43 20 5,888 0 833 378 7,639
November 632 61 12 5,746 0 929 405 7,785
December 795 166 29 6,486 0 949 407 8,833
Year 2018
January 952 314 29 5,302 0 964 436 7,998
February 719 87 25 4,783 0 967 423 7,006
March 691 80 23 4,924 0 989 421 7,128
April 573 59 9 4,382 0 904 428 6,354
May 455 43 0 4,357 0 897 449 6,201
June 429 39 0 4,655 0 889 407 6,419
July 474 60 0 5,401 0 914 431 7,280
August 491 53 0 5,442 0 945 421 7,352
September 525 43 14 4,686 0 755 297 6,321
October 496 49 13 4,576 0 831 373 6,338
November 565 93 24 4,858 0 864 403 6,808
December 573 100 26 4,946 0 982 429 7,056
Year 2019
January 724 200 28 5,239 0 966 482 7,639
February 678 111 16 4,804 0 824 411 6,843
March 691 101 22 4,740 0 816 357 6,728
April 481 52 19 4,242 0 577 178 5,549
May 451 467 0 4,067 0 582 222 5,790
June 305 28 0 4,308 0 613 242 5,497
July 409 48 0 5,172 0 605 213 6,447
August 440 77 0 4,892 0 671 257 6,337
September 474 51 0 4,494 0 647 223 5,888
October 435 55 0 4,370 0 691 242 5,794
November 524 82 0 4,692 0 675 251 6,224
December 599 72 11 5,335 0 640 257 6,914

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.