Table 9.3. Quantity and Net Summer Capacity of Operable Cooling Systems, by Energy Source and
Cooling System Type, 2013 - 2023


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)
2013
Coal 345 120,340 357 164,826 77 39,482 4 1,422 1 750 11 4,797
Natural Gas 159 51,291 428 88,707 58 18,883 58 12,828 4 637 4 2,481
Nuclear 45 50,266 38 40,013 13 15,251 -- -- -- -- 8 11,181
Petroleum 51 12,760 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 50,985 420 84,984 56 20,294 58 11,878 4 637 3 2,419
Nuclear 44 49,586 35 37,650 13 15,237 -- -- -- -- 9 11,886
Petroleum 42 10,893 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 49,219 437 88,982 59 22,351 59 12,038 3 475 3 2,410
Nuclear 43 47,268 35 37,610 14 17,663 -- -- -- -- 9 12,062
Petroleum 29 9,104 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 49,664 441 88,690 58 21,970 64 14,128 3 475 3 2,359
Nuclear 42 47,029 35 38,745 14 17,660 -- -- -- -- 9 13,298
Petroleum 27 8,620 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 50,053 440 91,398 59 21,677 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
2018
Coal 180 70,659 273 138,632 67 39,593 4 1,422 1 750 16 8,089
Natural Gas 161 47,653 446 93,078 59 21,549 77 18,613 4 801 7 4,478
Nuclear 41 46,723 35 38,805 14 17,759 -- -- -- -- 9 13,608
Petroleum 27 8,575 8 1,844 3 2,304 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 1 110 -- --
Other 17 1,931 25 2,161 1 31 1 72 -- -- 1 128
2019
Coal 163 67,142 246 129,998 63 37,807 4 1,432 1 750 14 7,629
Natural Gas 150 45,079 448 95,673 56 21,279 78 18,769 4 801 7 4,058
Nuclear 40 46,244 34 37,970 14 17,759 -- -- -- -- 10 14,927
Petroleum 26 8,147 7 1,684 3 2,302 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 900 1 110 -- --
Other 18 1,962 25 2,161 -- -- 1 72 -- -- 1 128
2020
Coal 143 61,538 232 123,410 58 35,832 5 1,536 1 750 13 6,703
Natural Gas 152 46,653 453 97,151 56 23,018 83 19,640 4 801 8 4,804
Nuclear 39 43,163 33 37,281 14 17,855 -- -- -- -- 9 14,326
Petroleum 24 7,175 6 898 2 682 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 893 1 110 -- --
Other 18 1,955 25 2,158 -- -- 1 72 -- -- 1 128
2021
Coal 130 59,230 221 119,928 58 35,856 5 1,536 1 750 14 7,992
Natural Gas 144 44,244 460 101,024 52 22,762 82 19,627 4 801 6 3,612
Nuclear 38 42,013 33 37,471 14 17,862 -- -- -- -- 9 14,213
Petroleum 24 7,622 6 898 2 684 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 893 1 110 -- --
Other 18 1,955 22 2,045 -- -- 1 72 -- -- 1 128
2022
Coal 105 46,596 207 112,393 57 35,718 4 1,432 1 750 11 6,581
Natural Gas 146 46,954 458 102,623 52 21,970 85 21,884 4 801 9 4,947
Nuclear 38 42,002 32 36,609 14 17,847 -- -- -- -- 9 14,198
Petroleum 27 9,035 6 1,020 1 628 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 893 1 110 -- --
Other 15 1,760 19 1,773 -- -- 1 72 -- -- 1 128
2023
Coal 94 41,649 198 107,601 54 34,183 4 1,432 1 750 10 5,581
Natural Gas 136 44,252 456 103,264 52 21,758 90 24,794 5 947 7 3,901
Nuclear 38 41,999 33 37,713 14 17,799 -- -- -- -- 9 14,198
Petroleum 26 7,954 6 1,020 1 637 -- -- -- -- -- --
Solar Thermal -- -- 4 866 -- -- 5 893 1 110 -- --
Other 16 1,806 20 1,826 -- -- 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, waste coal, refined coal; and coal-derived synthesis gas.
Petroleum Liquids includes distillate and residual fuel oils, jet fuel, kerosene, waste oil, and beginning in 2011, propane.
Petroleum Coke includes petroleum coke-derived synthesis gas.
Other Energy Sources consists of wood and wood waste products, biomass, blast furnace gas and Other Fossil Gas.

Source: Form EIA-860, "Annual Electric Generator Report."