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Data as of 2024
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Built 2026-10-28 (28 October 2026)

The United States Has the Most Nuclear Capacity, 96.8 GW in 2024

Ember's latest complete year of installed capacity data is 2024. Among the 27 countries with at least 1.00 GW of nuclear capacity in 2024, the United States has the most, 96.8 GW, and China added the most since 2019, +12.1 GW. Romania ran its nuclear plants at the highest capacity factor, 95.5%. Worldwide, nuclear capacity was 407 GW in 2024, against 404 GW in 2019.

Key Facts

  • The latest complete Ember year of installed capacity data is 2024; each country is compared with its own 2019 and 2014 figures.
  • World nuclear capacity was 407 GW in 2024, 404 GW in 2019 and 385 GW in 2014.
  • World nuclear generation was 2,777 TWh in 2024, a capacity factor of 77.6% on 407 GW.
  • the United States has the most nuclear capacity: 96.8 GW in 2024, generating 782 TWh.
  • Over 2019 to 2024, China added the most nuclear capacity: +12.1 GW, to 60.8 GW.
  • Over 2014 to 2024, China added the most nuclear capacity: +40.8 GW, to 60.8 GW.
  • Pakistan grew fastest in percentage terms since 2019 among countries that already had 1.00 GW or more: +218%.
  • Capacity factor in 2024 ranged from 29.2% in Japan to 95.5% in Romania, across 27 countries with a usable figure.

Countries With the Most Nuclear Capacity, 2024

Ember, 2009 to 2024

Installed capacity, 2024

Installed nuclear capacity in 2024, GW
United States96.8 GW
France61.4 GW
China60.8 GW
Japan33.1 GW
Russia28.7 GW
South Korea26.1 GW
Canada12.7 GW
India8.18 GW
Spain7.12 GW
Sweden7.00 GW

Highest capacity factor, 2024

Highest nuclear capacity factor in 2024, percent
Romania95.5%
Switzerland92.1%
United States91.9%
Belgium90.5%
Brazil90.3%
Hungary89.8%
Bulgaria89.4%
Spain87.2%
Mexico87.0%
Russia85.7%
Installed nuclear capacity, five largest countries Installed nuclear capacity in GW for the five countries with the most in 2024, 2009 to 2024. United States ends at 96.8 GW; France ends at 61.4 GW; China ends at 60.8 GW; Japan ends at 33.1 GW; Russia ends at 28.7 GW. 0 30 60 90 120 2009201420192024
Installed nuclear capacity in GW for the five countries with the most in 2024, 2009 to 2024. United States ends at 96.8 GW; France ends at 61.4 GW; China ends at 60.8 GW; Japan ends at 33.1 GW; Russia ends at 28.7 GW.
Annual statistics, 2009 to 2024
Installed nuclear capacity, five largest countries
YearUnited StatesFranceChinaJapanRussia
2009101 GW63.1 GW9.08 GW48.9 GW24.3 GW
2010101 GW63.1 GW10.8 GW49.0 GW24.3 GW
2011101 GW63.1 GW12.6 GW49.0 GW24.3 GW
2012102 GW63.1 GW12.6 GW46.2 GW25.3 GW
201399.2 GW63.1 GW14.7 GW44.3 GW25.3 GW
201498.6 GW63.1 GW20.1 GW44.3 GW26.4 GW
201598.7 GW63.1 GW27.2 GW42.1 GW27.2 GW
201699.6 GW63.1 GW33.6 GW41.5 GW28.0 GW
201799.6 GW63.1 GW35.8 GW39.1 GW28.0 GW
201899.4 GW63.1 GW44.7 GW38.0 GW29.2 GW
201998.1 GW63.1 GW48.7 GW33.1 GW30.4 GW
202096.5 GW61.4 GW49.9 GW33.1 GW29.5 GW
202195.6 GW61.4 GW53.3 GW33.1 GW29.7 GW
202294.7 GW61.4 GW55.5 GW33.1 GW29.7 GW
202395.7 GW61.4 GW56.9 GW33.1 GW29.7 GW
202496.8 GW61.4 GW60.8 GW33.1 GW28.7 GW

Nuclear Capacity, Growth and Capacity Factor by Country, 2024

27 countries
Installed nuclear capacity by country in 2024, change since 2019 and 2014, generation and capacity factor. Column headings sort the table.
CountryCapacity 2024Change since 2019Growth since 2019Change since 2014Growth since 2014Generation 2024Capacity factor 2024
United States96.8 GW-1.29 GW-1%-1.74 GW-2%782 TWh91.9%
France61.4 GW-1.73 GW-3%-1.73 GW-3%380 TWh70.5%
China60.8 GW+12.1 GW+25%+40.8 GW+203%451 TWh84.4%
Japan33.1 GW0 GW0%-11.2 GW-25%84.9 TWh29.2%
Russia28.7 GW-1.70 GW-6%+2.27 GW+9%216 TWh85.7%
South Korea26.1 GW+2.80 GW+12%+5.33 GW+26%189 TWh82.5%
Canada12.7 GW-670 MW-5%-1.36 GW-10%85.5 TWh76.8%
India8.18 GW+1.40 GW+21%+2.40 GW+42%54.7 TWh76.1%
Spain7.12 GW0 GW0%-280 MW-4%54.5 TWh87.2%
Sweden7.00 GW-1.62 GW-19%-2.51 GW-26%50.7 TWh82.4%
United Kingdom5.88 GW-3.38 GW-37%-4.06 GW-41%40.6 TWh78.6%
United Arab Emirates5.56 GW+5.56 GWn/a+5.56 GWn/a40.6 TWh83.2%
Finland4.37 GW+1.58 GW+57%+1.62 GW+59%32.6 TWh84.9%
Czechia4.29 GW0 GW0%0 GW0%29.7 TWh78.8%
Belgium3.93 GW-2.00 GW-34%-2.00 GW-34%31.3 TWh90.5%
Pakistan3.62 GW+2.48 GW+218%+2.83 GW+358%23.2 TWh72.9%
Switzerland2.97 GW-360 MW-11%-340 MW-10%24.0 TWh92.1%
Slovakia2.47 GW+530 MW+27%+530 MW+27%18.2 TWh84.0%
Belarus2.34 GW+2.34 GWn/a+2.34 GWn/a15.7 TWh76.3%
Hungary2.03 GW+20 MW+1%+30 MW+1%16.0 TWh89.8%
Bulgaria2.01 GW0 GW0%+30 MW+2%15.8 TWh89.4%
Brazil1.99 GW0 GW0%0 GW0%15.8 TWh90.3%
South Africa1.93 GW-10 MW-1%-10 MW-1%7.80 TWh46.0%
Argentina1.75 GW0 GW0%+230 MW+15%10.5 TWh68.0%
Mexico1.61 GW0 GW0%0 GW0%12.3 TWh87.0%
Romania1.30 GW0 GW0%0 GW0%10.9 TWh95.5%
Iran1.02 GW0 GW0%0 GW0%7.04 TWh78.6%

Countries with at least 1.00 GW of nuclear capacity in 2024: 27 are listed, and 5 countries with less are left out. Each is compared with its own 2019 and 2014 values; a country that has not published 2024 is not listed, and a blank means Ember has no figure. Growth in percent is shown only when the earlier year had at least 100 MW; a tiny base gives meaningless percentages.

How Capacity Factor Is Calculated

2024, 8,784 hours

Capacity factor is a country's nuclear generation in 2024 divided by its installed capacity times the 8,784 hours in 2024, using the same year for both. It is the share of the year the fleet would have needed to run at full output to produce what it did. Guards: the factor is left blank where capacity is missing or under 1.00 GW, where generation is missing, and where it comes out above 100% (none here), which is treated as a data error or under reported capacity. If capacity grew during 2024, the factor is understated, because a full year of output is set against the larger figure.

Lowest capacity factor, 2024

Lowest nuclear capacity factor in 2024, percent
Japan29.2%
South Africa46.0%
Argentina68.0%
France70.5%
Pakistan72.9%
India76.1%
Belarus76.3%
Canada76.8%
Iran78.6%
United Kingdom78.6%

Source: Ember (ember-energy.org), licensed under CC BY 4.0. Data as of 2024. Installed capacity and generation from Ember annual statistics, complete years to 2024.

Cite this page
APA 7

World Power Monitor. (2024). Nuclear Capacity by Country: Installed GW and Capacity Factor. https://worldpowermonitor.com/capacity/nuclear/

Plain text

World Power Monitor. Nuclear Capacity by Country: Installed GW and Capacity Factor. Data as of 2024. Data from Ember. https://worldpowermonitor.com/capacity/nuclear/

BibTeX 
@misc{wpm_capacity_nuclear_2024,
  title = {{Nuclear Capacity by Country: Installed GW and Capacity Factor}},
  author = {{World Power Monitor}},
  year = {2024},
  note = {Data as of 2024. Data from Ember.},
  url = {https://worldpowermonitor.com/capacity/nuclear/}
}

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