These 5 Countries Have 71% of World’s Nuclear Power Capacity - CleanTechnica

As of June 2025, five countries—the United States, France, China, Russia, and South Korea—account for 71% of the world’s total nuclear electricity generation capacity, according to IAEA data. Globally, 416 nuclear reactors operate across 31 countries, totaling 376 gigawatts (GW) of installed capacity. The U.S. leads with the largest capacity and nuclear electricity production, operating reactors primarily built between 1967 and 1990, with a high operational capacity factor of 92% in 2024. Nuclear power contributed significantly to U.S. electricity generation in 2023 and 2024. France holds the second-largest nuclear fleet globally and the largest in Europe, with 63 GW installed capacity. Nuclear power supplied nearly 65% of France’s electricity in 2023, a legacy of extensive development following the 1970s oil crisis to enhance energy security. China has rapidly expanded its nuclear capacity since 1991 and currently operates