Countries Ranked as per Nuclear Power Capacities in 2025.

Oct 2025 : Nuclear power supplies a steady source of low-carbon electricity across many grids. But as of now few countries have managed to generate the electricity. International Atomic Energy Agency’s Power Reactor Information System (PRIS), provides all information pertinent to the Nuclear Power Capacities per individual nation.

United States, France, China, Russia and South Korea are the top five nations those who dominate the global capacity, accounting 71% of the total global nuclear capacity.

The United States tops the list with 97 GW across 94 reactors. France ranks second at 63 GW, a result of its historic policy to standardise and scale nuclear after the 1970s oil shocks. China follows at 55 GW. Russia (27 GW) and South Korea (26 GW) round out the top five.

Reactor Count vs. Reactor Scale:

France and China both operate 57 reactors, yet France’s capacity is higher at 63 GW versus China’s 55 GW. The gap points to average reactor size, capacity uprates, and fleet composition. France’s standardised designs and efficiency upgrades push more net output per unit. China’s fleet includes a mix of older and newer designs, with several units commissioned in the past decade.

However, as China has built larger Gen III+ reactors, this capacity differential could narrow quickly, alongside demonstrating that half of the world’s nuclear power under construction is located in China.

Emerging Players:

Emerging players are also reshaping the nuclear map: the United Arab Emirates has reached 5 GW with just four reactors, while Finland and the U.K. maintain smaller but strategic fleets. Similarly, India has steadily expanded its nuclear capacity over recent decades, operating 21 reactors with a combined net capacity of 9 GW.

Team Maverick