Energy capacity factors in the U.S. 2024, by source

Nuclear power had the highest capacity factor among energy sources in the United States, at over 92 percent in 2024. Geothermal energy-generating facilities followed and had the largest capacity factor among renewable sources at 65 percent. In contrast, natural gas and petroleum ranked the lowest.

Cost of nuclear power in the United States

Despite the large capacity factor, nuclear power plants had one of the highest levelized costs of electricity in the country. The operating expenses of nuclear utilities in the U.S. are nearly 50 percent lower than those of fossil fuel power plants, indicating higher capital expenditure for these facilities.

Capacity factor of renewable energy plants

Excluding geothermal energy, the capacity factor of renewable energy plants in the U.S. was roughly 34 percent for hydropower and wind energy and close to 23 percent for solar photovoltaic and solar thermal in 2023. Overall, the capacity factor of offshore wind power worldwide was at 41 percent in 2023, while the one of utility-scale solar PV was at approximately 16 percent in that year.