Table 9.3. Quantity and Net Summer Capacity of Operable Cooling Systems, by Energy Source and
Cooling System Type, 2004 - 2014


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)
2004
Coal 479 134,761 352 154,144 103 50,067 -- -- -- -- 14 5,911
Natural Gas 211 53,190 413 74,941 72 27,937 39 9,470 1 111 7 1,911
Petroleum 89 23,811 22 6,838 3 3,220 -- -- -- -- 2 2,004
Other 15 1,029 25 2,027 -- -- 2 100 -- -- 4 424
2005
Coal 473 134,241 350 153,791 103 50,113 -- -- -- -- 14 6,002
Natural Gas 209 53,599 416 78,493 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 51,672 412 79,043 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 51,836 419 80,421 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 51,110 420 81,293 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 48,737 424 82,892 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 437 129,554 366 161,769 101 48,929 2 435 1 766 7 2,632
Natural Gas 180 48,398 420 82,080 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 415 127,412 364 164,775 104 50,476 3 840 1 766 7 2,636
Natural Gas 176 48,361 435 86,128 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 372 124,589 361 165,731 88 39,933 4 1,412 1 766 13 6,463
Natural Gas 172 52,020 440 91,255 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 345 120,340 352 163,642 77 39,482 4 1,422 1 750 9 4,342
Natural Gas 159 51,291 421 87,668 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 328 115,930 335 159,351 74 38,906 4 1,422 1 750 20 7,868
Natural Gas 161 50,985 413 83,944 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

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."