With a generating capacity of approximately 35 gigawatts (GW), TVA has the sixth highest generation capacity of any utility company in the United States and the third largest nuclear power fleet, with seven units at three sites.[1][15] In addition, it also operates four coal-fired power plants, 29 hydroelectric dams, nine simple-cycle natural gas combustion turbine plants, nine combined cycle gas plants, 1 pumped storage hydroelectric plant, 1 wind energy site, and 14 solar energy sites.[16] In fiscal year 2020, nuclear generation made up about 41% of TVA's total energy production, natural gas 26%, coal 14%, hydroelectric 13%, and wind and solar 3%.[16] TVA purchases about 15% of the power it sells from other power producers, which includes power from combined cycle natural gas plants, coal plants, and wind installations, and other renewables.[17] The cost of Purchased Power is part of the "Fuel Cost Adjustment" (FCA) charge that is separate from the TVA Rate. In addition, the Watts Bar Nuclear Plant is the only facility in the country to industrially produce tritium, which is used by the National Nuclear Security Administration for nuclear weapons, where it is used to supercharge and boost the explosive yield of the U.S. nuclear arsenal.[18]
