Table 9.3. Quantity and Net Summer Capacity of Operable Cooling Systems, by Energy Source and
Cooling System Type, 2005 - 2015


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)
2005
Coal 473 134,241 350 153,791 103 50,113 -- -- -- -- 14 6,002
Natural Gas 209 53,599 418 78,827 65 27,571 39 9,470 2 272 7 2,071
Petroleum 85 22,842 23 6,852 3 3,174 -- -- -- -- 2 2,004
Other 15 1,029 21 1,981 -- -- 2 100 -- -- 4 424
2006
Coal 463 132,567 351 154,164 101 49,609 -- -- -- -- 13 5,828
Natural Gas 202 51,672 414 79,377 67 28,323 41 9,946 2 272 9 2,504
Petroleum 81 22,259 23 6,824 3 2,513 -- -- -- -- 2 2,017
Other 16 1,072 28 2,462 -- -- 2 100 -- -- 4 424
2007
Coal 458 131,692 353 155,518 101 49,609 -- -- -- -- 13 5,828
Natural Gas 202 51,836 421 80,755 66 27,563 41 9,946 2 272 9 2,668
Petroleum 81 22,259 23 6,824 3 2,513 -- -- -- -- 2 2,017
Other 16 1,072 28 2,522 -- -- 2 100 -- -- 4 424
2008
Coal 453 131,909 358 157,602 100 48,787 -- -- -- -- 8 3,912
Natural Gas 197 51,110 422 81,627 59 25,261 42 10,209 2 272 10 2,957
Petroleum 80 22,299 20 6,614 3 4,104 -- -- -- -- 2 2,022
Other 16 1,162 25 2,251 -- -- 2 100 -- -- 4 424
2009
Coal 445 129,350 366 160,545 100 47,960 1 335 -- -- 6 2,582
Natural Gas 192 48,737 426 83,226 57 23,022 51 12,338 3 482 3 1,175
Petroleum 77 21,756 18 6,575 3 4,104 -- -- -- -- 2 2,022
Other 16 1,160 25 2,316 2 344 4 356 -- -- 1 33
2010
Coal 437 129,554 367 162,186 101 48,929 2 435 1 766 7 2,632
Natural Gas 180 48,398 422 82,414 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 76 20,878 17 5,513 3 4,064 -- -- -- -- 2 2,022
Other 17 1,190 26 2,546 2 344 4 356 -- -- 2 63
2011
Coal 415 127,412 365 165,192 104 50,476 3 840 1 766 7 2,636
Natural Gas 176 48,361 437 86,462 58 21,944 57 13,471 3 542 2 870
Nuclear 49 51,642 39 43,422 13 15,011 -- -- -- -- 8 8,890
Petroleum 66 17,099 17 5,443 4 4,692 -- -- -- -- 2 2,022
Other 18 1,318 20 1,641 -- -- 1 26 -- -- 2 63
2012
Coal 372 124,589 362 166,148 88 39,933 4 1,412 1 766 13 6,463
Natural Gas 172 52,020 442 91,589 54 18,533 59 13,813 4 637 2 499
Nuclear 49 51,846 38 39,561 13 15,105 -- -- -- -- 8 8,900
Petroleum 59 14,971 17 4,046 4 4,692 -- -- -- -- 2 2,022
Other 15 1,258 27 2,167 -- -- 1 53 -- -- 2 63
2013
Coal 345 120,340 353 164,059 77 39,482 4 1,422 1 750 9 4,342
Natural Gas 159 51,291 423 88,002 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 45 11,556 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 328 115,930 336 159,768 74 38,906 4 1,422 1 750 20 7,868
Natural Gas 161 50,985 415 84,278 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 36 9,689 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 93,180 309 153,151 77 45,026 4 1,422 1 750 23 9,429
Natural Gas 160 49,219 432 88,276 58 22,311 58 11,936 3 475 3 2,410
Nuclear 43 47,268 35 37,610 14 17,663 -- -- -- -- 9 12,062
Petroleum 23 7,900 9 2,308 4 4,299 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 -- -- -- --
Other 18 1,676 26 2,104 1 66 1 72 -- -- 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."