The United States operates 102.5 gigawatts of nuclear power capacity, the largest installed fleet in the world, according to a Visual Capitalist chart built on Global Energy Monitor data as of September 2025. The chart also tracks prospective capacity, defined as projects under construction, in pre-construction or announced.

U.S. prospective nuclear capacity stands at 15.4 GW. Combined with the operating fleet, total future U.S. capacity would reach 117.9 GW if all tracked projects are completed.

The U.S. operating total exceeds France, the second-largest operator, by more than 35 GW. France runs 65.7 GW today with 9.9 GW prospective, for a combined 75.6 GW. China operates 60.9 GW and carries the largest prospective pipeline at 124.9 GW, which would lift its combined total to 185.8 GW and place the United States second on the future ranking.

Other operating fleets in the chart include Russia at 28.6 GW, South Korea at 27.1 GW, Canada at 14.6 GW, Ukraine at 13.8 GW and Japan at 13.3 GW. Canada, the largest U.S. neighbor on the list, adds 2.5 GW of prospective capacity for a future total of 17.2 GW.

Several countries with no operating reactors appear on the list with new build plans, including Uganda at 18.0 GW, Poland at 15.6 GW and Turkiye at 14.7 GW. Visual Capitalist notes that prospective capacity includes large plants along with a growing number of smaller reactor designs. The data reflects the latest Global Energy Monitor figures available as of March 2026.

Source: Visual Capitalist - https://www.visualcapitalist.com/expected-nuclear-capacity-by-country/