In 2024, US utilities operated 94 nuclear reactors with a combined net generating capacity of nearly 97 gigawatts, the largest commercial nuclear fleet of any country, according to the US Energy Information Administration. France ranked second with 57 units totaling 63 gigawatts, followed by China, also with 57 units but a combined 55.3 gigawatts, and Russia with 36 units and 28.6 gigawatts. Nuclear power continues to supply about 19 percent of total US power sector electricity generation.

America's nuclear fleet spans 54 power plants, each holding one to four reactors. Plant Vogtle in Georgia is now the largest single nuclear plant in the country, with four reactors delivering a combined generating capacity of about 4.5 gigawatts after Georgia Power added Units 3 and 4 in 2023 and 2024. Before those additions, the Palo Verde plant in Arizona, at 3.9 gigawatts, held the largest capacity title. At the other end of the scale, the single reactor R.E. Ginna plant in New York generates just 0.6 gigawatts, the smallest nuclear plant still operating in the country.

Twelve US nuclear reactors have permanently closed since 2013, yet the remaining fleet has maintained consistently high capacity factors, a measure of how much of the time units generate power relative to their maximum output. EIA attributes the sustained high performance in part to shorter refueling and maintenance outages and to decades of accumulated operating experience across the industry.

Source: U.S. Energy Information Administration - https://www.eia.gov/todayinenergy/detail.php?id=65104