Table 4.3. Existing Capacity by Energy Source, 2013 (Megawatts)

Energy Source Number of Generators Generator Nameplate Capacity Net Summer Capacity Net Winter Capacity
Coal 1,212 329,815 303,306 305,824
Petroleum 3,601 49,794 43,523 47,412
Natural Gas 5,700 488,169 425,390 458,175
Other Gases 99 2,452 2,108 2,100
Nuclear 100 104,424 99,240 100,980
Hydroelectric Conventional 4,002 78,581 79,200 78,677
Wind 977 60,712 59,973 60,068
Solar Thermal and Photovoltaic 874 6,674 6,623 6,492
Wood and Wood-Derived Fuels 369 9,477 8,354 8,420
Geothermal 193 3,765 2,607 2,805
Other Biomass 1,850 5,832 5,043 5,118
Hydroelectric Pumped Storage 156 21,602 22,389 22,354
Other Energy Sources 110 2,728 2,307 2,347
Total 19,243 1,164,022 1,060,064 1,100,772

Notes: 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 includes distillate fuel oil (all diesel and No. 1, No. 2, and No. 4 fuel oils), residual fuel oil (No. 5 and No. 6 fuel oils and bunker C fuel oil), jet fuel, kerosene, petroleum coke (converted to liquid petroleum, see Technical Notes for conversion methodology), waste oil, and beginning in 2011, synthetic gas and propane. Prior to 2011, synthetic gas and propane were included in Other Gases.
Other Gases includes blast furnace gas. Prior to 2011, waste heat was included in Natural Gas.
Hydroelectric Conventional capacity includes conventional hydroelectric power excluding pumped storage facilities.
Wood and wood-derived fuels include wood/wood waste solids (including paper pellets, railroad ties, utility poles, wood chips, bark, and wood waste solids), wood waste liquids (red liquor, sludge wood, spent sulfite liquor, and other wood-based liquids), and black liquor.
Other Biomass include municipal solid waste, landfill gas, sludge waste, agricultural byproducts, other biomass solids, other biomass liquids, and other biomass gases (including digester gases, methane, and other biomass gases).
Hydroelectric Conventional capacity includes conventional hydroelectric power excluding pumped storage facilities.
Other Energy Sources include batteries, hydrogen, purchased steam, sulfur, tire-derived fuels and other miscellaneous energy sources.
Capacity by energy source is based on the capacity associated with the energy source reported as the most predominant (primary) one, where more than one energy source is associated with a generator.
In 2011, EIA corrected the NAICS codes of several plants which resulted in a net capacity shift from the electric utility sector to the commercial sector.
Source: U.S. Energy Information Administration, Form EIA-860, 'Annual Electric Generator Report.'