Table 9.3. Quantity and Net Summer Capacity of Operable Cooling Systems, by Energy Source and
Cooling System Type, 2007 - 2017


Once-Through Cooling Systems Recirculating Cooling Systems Cooling Ponds Dry Cooling Systems Hybrid Wet and Dry Cooling Systems Other Cooling System Types
Energy Source Quantity Associated Net Summer Capacity (MW) Quantity Associated Net Summer Capacity (MW) Quantity Associated Net Summer Capacity (MW) Quantity Associated Net Summer Capacity (MW) Quantity Associated Net Summer Capacity (MW) Quantity Associated Net Summer Capacity (MW)
2007
Coal 458 131,692 357 156,284 101 49,609 -- -- -- -- 15 6,283
Natural Gas 202 51,836 424 81,379 66 27,563 41 9,946 2 272 9 2,668
Petroleum 85 22,613 23 6,824 3 2,513 -- -- -- -- 2 2,017
Other 16 1,072 28 2,522 -- -- 2 100 -- -- 4 424
2008
Coal 453 131,909 362 158,369 100 48,787 -- -- -- -- 10 4,366
Natural Gas 197 51,110 425 82,251 59 25,261 42 10,209 2 272 10 2,957
Petroleum 84 22,654 20 6,614 3 4,104 -- -- -- -- 2 2,022
Other 16 1,162 25 2,251 -- -- 2 100 -- -- 4 424
2009
Coal 445 129,350 370 161,312 100 47,960 1 335 -- -- 8 3,036
Natural Gas 192 48,737 429 83,850 57 23,022 51 12,338 3 482 3 1,175
Petroleum 81 22,111 18 6,575 3 4,104 -- -- -- -- 2 2,022
Other 16 1,160 25 2,316 2 344 4 356 -- -- 1 33
2010
Coal 437 129,554 371 162,953 101 48,929 2 435 1 766 9 3,086
Natural Gas 180 48,398 425 83,038 57 22,746 54 13,078 3 542 3 1,172
Nuclear 49 51,465 39 43,363 13 14,996 -- -- -- -- 7 7,901
Petroleum 80 21,232 17 5,513 3 4,064 -- -- -- -- 2 2,022
Other 17 1,190 26 2,546 2 344 4 356 -- -- 2 63
2011
Coal 415 127,412 369 165,958 104 50,476 3 840 1 766 9 3,090
Natural Gas 176 48,361 440 87,086 58 21,944 57 13,471 3 542 2 870
Nuclear 49 51,642 39 43,422 13 15,011 -- -- -- -- 8 8,890
Petroleum 70 17,454 17 5,443 4 4,692 -- -- -- -- 2 2,022
Other 18 1,318 20 1,641 -- -- 1 26 -- -- 2 63
2012
Coal 372 124,589 366 166,915 88 39,933 4 1,412 1 766 15 6,918
Natural Gas 172 52,020 445 92,213 54 18,533 59 13,813 4 637 2 499
Nuclear 49 51,846 38 39,561 13 15,105 -- -- -- -- 8 8,900
Petroleum 63 15,326 17 4,046 4 4,692 -- -- -- -- 2 2,022
Other 15 1,258 27 2,167 -- -- 1 53 -- -- 2 63
2013
Coal 345 120,340 357 164,826 77 39,482 4 1,422 1 750 11 4,797
Natural Gas 159 51,291 426 88,626 57 18,843 58 12,828 4 637 4 2,481
Nuclear 45 50,266 38 40,013 13 15,251 -- -- -- -- 8 11,181
Petroleum 49 11,910 11 3,481 4 4,692 -- -- -- -- -- --
Solar Thermal -- -- 2 591 -- -- 4 516 -- -- -- --
Other 15 1,301 31 2,561 1 66 -- -- -- -- 1 128
2014
Coal 328 115,930 340 160,534 74 38,906 4 1,422 1 750 22 8,322
Natural Gas 161 50,985 418 84,902 55 20,254 58 11,878 4 637 3 2,419
Nuclear 44 49,586 35 37,650 13 15,237 -- -- -- -- 9 11,886
Petroleum 40 10,043 11 3,473 4 4,691 -- -- -- -- -- --
Solar Thermal -- -- 4 841 -- -- 5 900 -- -- -- --
Other 16 1,332 31 2,756 1 66 1 72 -- -- 1 128
2015
Coal 259 93,180 313 153,917 77 45,026 4 1,422 1 750 25 9,883
Natural Gas 160 49,219 435 88,900 58 22,311 59 12,038 3 475 3 2,410
Nuclear 43 47,268 35 37,610 14 17,663 -- -- -- -- 9 12,062
Petroleum 27 8,254 9 2,308 4 4,299 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 1 110 -- --
Other 18 1,676 26 2,104 1 66 1 72 -- -- 1 128
2016
Coal 210 82,047 294 149,187 79 44,702 4 1,422 1 750 22 10,148
Natural Gas 168 49,664 438 88,428 57 21,930 64 14,128 3 475 3 2,359
Nuclear 42 47,029 35 38,745 14 17,660 -- -- -- -- 9 13,298
Petroleum 25 7,771 8 2,222 3 3,904 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 1 110 -- --
Other 18 1,689 24 2,035 1 66 1 72 -- -- 1 128
2017
Coal 197 76,492 281 142,578 75 44,341 4 1,422 1 750 19 9,581
Natural Gas 172 50,053 437 91,135 58 21,637 66 15,271 4 801 6 3,772
Nuclear 42 47,013 35 38,784 14 17,700 -- -- -- -- 9 13,298
Petroleum 26 8,174 8 1,844 4 3,965 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 1 110 -- --
Other 17 1,582 26 2,464 2 97 2 245 -- -- 1 128

Notes:
'Associated Net Summer Capacity' is defined as the net summer capacity of the generators that are associated with the operation of this environmental equipment.
In some cases respondents have reported equipment late. Counts and capacity may have changed from prior publications of this table because of late reporting.
Coal includes anthracite, bituminous, subbituminous, lignite, and waste coal; coal synfuel 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.
EIA did not collect cooling system data for nuclear units before 2010.
Other Energy Sources consists of wood and wood waste products, biomass, blast furnace gas and other gases.
Data for 2005 and earlier are based primarily on Form EIA-767 data. In 2006, the Form EIA-767 was suspended. Data for 2007 and later are based primarily on Form EIA-860 data. All data for 2006 are inferred based on submissions from subsequent years.

Source: U.S. Energy Information Administration, Forms EIA-767, "Steam-Electric Plant Operation and Design Report" and Form EIA-860, "Annual Electric Generator Report."