Planned global nuclear power reactor additions 2025, by country

As of May 2025, almost half of the planned nuclear reactors worldwide were in China. This country planned the construction of 40 nuclear units out of the total global number of 110. Russia followed in second place with 23 planned nuclear reactors. 

Nuclear reactors

Nuclear reactors are used to start and control a nuclear chain reaction in power plants. The heat from the reaction is transferred to a working fluid, which in turn runs through turbines for both electricity generation and ship propulsion. Nuclear reactors can also be used in the creation of isotopes for medical or industrial purposes, as well as for weapons production.
The mean construction time for global nuclear reactors completed between 2014 and 2023 averaged 10 years, ranging from a minimum of six in China to a maximum of 38 in Slovakia. 

Nuclear power reactors worldwide

While China and Russia had the largest number of planned nuclear reactors, the United States reported the largest number of operable nuclear reactors at as of May 2025, with 94 units. China and France followed, with 58 and 57 operable reactors respectively at that time. 
In terms of nuclear reactors under construction, China led the ranking, with 25 units as of July 2024.