Table 9.3. Quantity and Net Summer Capacity of Operable Cooling Systems, by Energy Source and
Cooling System Type, 2003 - 2013


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)
2003
Coal 489 136,510 342 151,899 102 49,385 -- -- -- -- 15 6,136
Natural Gas 211 52,574 394 68,046 77 30,433 27 6,877 -- -- 7 1,911
Petroleum 101 25,061 22 6,838 4 3,610 -- -- -- -- 2 2,004
Other 16 1,079 24 1,919 -- -- 1 26 -- -- 4 420
2004
Coal 479 134,761 350 153,804 103 50,067 -- -- -- -- 14 5,911
Natural Gas 212 53,260 412 74,156 72 27,937 32 7,768 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 473 134,241 348 153,451 103 50,113 -- -- -- -- 14 6,002
Natural Gas 210 53,669 415 77,708 65 27,571 32 7,768 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 464 132,638 349 153,824 101 49,609 -- -- -- -- 13 5,828
Natural Gas 203 51,742 411 78,258 67 28,323 34 8,244 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 459 131,763 351 155,178 101 49,609 -- -- -- -- 13 5,828
Natural Gas 203 51,906 417 79,193 66 27,563 34 8,244 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 454 131,980 356 157,262 100 48,787 -- -- -- -- 8 3,912
Natural Gas 199 51,228 418 80,065 59 25,261 35 8,507 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 447 129,505 364 160,205 100 47,960 1 335 -- -- 6 2,582
Natural Gas 195 49,541 422 81,664 57 23,022 44 10,636 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 438 129,557 364 161,429 101 48,929 2 435 1 766 7 2,632
Natural Gas 182 49,154 417 80,826 57 22,746 47 11,375 3 542 3 1,172
Nuclear 48 50,867 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 416 127,415 362 164,435 104 50,476 3 840 1 766 7 2,636
Natural Gas 177 48,431 432 84,874 58 21,944 52 12,242 3 542 2 870
Nuclear 48 51,044 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 373 124,592 359 165,391 88 39,933 4 1,412 1 766 13 6,463
Natural Gas 173 52,090 436 89,618 54 18,533 54 12,584 4 637 2 499
Nuclear 48 51,248 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 346 120,303 351 163,302 78 39,482 4 1,422 1 750 10 4,385
Natural Gas 162 52,015 422 86,590 57 18,843 56 12,918 4 637 4 2,481
Nuclear 44 50,266 38 40,013 13 15,251 -- -- -- -- 8 11,181
Petroleum 44 11,439 11 3,481 4 4,692 -- -- -- -- -- --
Solar Thermal -- -- 2 591 -- -- 3 391 -- -- -- --
Other 15 1,301 31 2,561 -- -- -- -- -- -- 2 242

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."