Top 10 Countries by Nuclear Power Capacity (2024)

Nuclear power capacity refers to the total electrical power output that a country's nuclear reactors can produce. It's measured in gigawatts (GW) and is calculated based on the combined maximum output of all operational nuclear reactors within the country.

As of 2024, the United States leads the world in nuclear power capacity, with 102 GW generated by its 94 reactors, making up about a quarter of global nuclear energy. France follows with 64 GW from 56 reactors, relying heavily on nuclear power for its electricity needs. China, rapidly expanding its nuclear sector, ranks third with 58 GW across 55 reactors. Russia holds fourth place with 29 GW from 37 reactors, while South Korea rounds out the top five with 27 GW from 24 reactors. Canada and Ukraine follow, with 15 GW and 14 GW, respectively. India, the UK, and Sweden complete the top 10, each with smaller but significant nuclear contributions, ranging from 6.9 to 8 GW.

1. United States

• Capacity: 102 GW

• Number of Reactors: 94

• Percentage of Global Nuclear Capacity: Approximately 26%
  

2. France

• Capacity: 64 GW

• Number of Reactors: 56

• Percentage of Global Nuclear Capacity: Approximately 16%
  

3. China

• Capacity: 58 GW

• Number of Reactors: 55

• Percentage of Global Nuclear Capacity: Approximately 15%
  

4. Russia

• Capacity: 29 GW

• Number of Reactors: 37

• Percentage of Global Nuclear Capacity: Approximately 7%
  

5. South Korea

• Capacity: 27 GW

• Number of Reactors: 24

• Percentage of Global Nuclear Capacity: Approximately 7%
  

6. Canada

• Capacity: 15 GW

• Number of Reactors: 19

• Percentage of Global Nuclear Capacity: Approximately 4%
  

7. Ukraine

• Capacity: 14 GW

• Number of Reactors: 15

• Percentage of Global Nuclear Capacity: Approximately 4%
  

8. India

• Capacity: 8 GW

• Number of Reactors: 23

• Percentage of Global Nuclear Capacity: Approximately 2%
  

9. United Kingdom

• Capacity: 7 GW

• Number of Reactors: 9

• Percentage of Global Nuclear Capacity: Approximately 2%
  

10. Sweden

• Capacity: 6.9 GW

• Number of Reactors: 6

• Percentage of Global Nuclear Capacity: Approximately 2%