U.S. nuclear electricity generation continues to decline as more reactors retire

In 2021, for the second consecutive year, U.S. nuclear electricity generation declined. Output from U.S. nuclear power plants totaled 778 million megawatthours in 2021, or 1.5% less than the previous year. Nuclear's share of U.S. electricity generation across all sectors in 2021 was similar to its average share in the previous decade: 19%.