Nuclear Power Capacity by Country (2025)

Ekim 2025

The Big Five Dominate Global Capacity

Five countries account for 71% of 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 standardize 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.

Country

Net Capacity (GW)

Number of Reactors

 United States

97

94

 France

63

57

 China

55

57

 Russia

27

36

 South Korea

26

26

 Ukraine

13

15

 Canada

13

17

 Japan

13

14

 India

8

21

 Spain

7

7

 Sweden

7

6

 United Kingdom

6

9

 United Arab Emirates

5

4

 Finland

4

5

 Czech Republic

4

6

 Belgium

4

4

 Pakistan

3

6

 Switzerland

3

4

 Rest of World

18

28

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 standardized 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 ramps larger Gen III+ reactors, this capacity differential could narrow quickly. Currently, nearly 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.


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