About 20% of U.S. electric power generating capacity can operate on multiple fuels

As of January 2021, the United States had almost 200 gigawatts (GW) of electric generating capacity that could functionally switch fuels, or about 18% of the total 1,116 GW of utility-scale electric generating capacity. About two-thirds, or 745 GW, of all utility-scale generating capacity involved technologies that could potentially use multiple energy sources, such as combustion turbines and steam turbines, as opposed to 371 GW of capacity that are single-source technologies such as wind turbines, hydroelectric dams, and nuclear reactors.