The United States runs the largest nuclear power plant fleet in the world, according to U.S. Energy Information Administration data, operating 94 commercial reactors with close to 97 gigawatts of net generating capacity. That fleet produces more nuclear electricity than any other country.

Nuclear generation remains highly concentrated globally. EIA analysis shows that five countries account for about 71 percent of the world's nuclear generation capacity, with the United States at the top of that group ahead of France, China and other major producers.

Capacity has held broadly steady even as individual units retire or come online, while output per reactor has risen through uprates and improved operating performance. The result is a mature U.S. fleet that continues to supply a significant share of the nation's around-the-clock electricity.

With demand rising and new builds years away from large-scale contribution, the existing fleet's size and reliability position it as a central piece of U.S. baseload supply, reinforcing federal and utility efforts to keep reactors running and lift their output.

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