Belarus Has Added the Most Nuclear Share Since 2020: +36.5 points
Ember's latest complete year of country data is 2025. Among the 79 countries that generated at least 10 TWh of electricity in 2025, Belarus moved most, +36.5 points since 2020 (37.4% in 2025). Worldwide, nuclear supplied 8.9% of electricity in 2025, against 9.9% in 2020. 1 country has exited nuclear, with a past peak of at least 1.00 TWh and under 100 GWh in 2025 and in the year before.
Key Facts
- The latest complete Ember year of country data is 2025; each country is compared with its own 2020 and 2015 figures.
- World nuclear generation was 2,809 TWh in 2025, 8.9% of world electricity (2,649 TWh and 9.9% in 2020).
- Over 2020 to 2025, Belarus added the most nuclear share: +36.5 points, to 37.4% in 2025.
- Over 2015 to 2025, Belarus added the most nuclear share: +37.4 points, to 37.4% in 2025.
- In absolute terms, China changed most over 2020 to 2025: +119 TWh of nuclear generation.
- Over 2015 to 2025, China changed most in absolute terms: +314 TWh of nuclear generation.
- Germany was furthest below its nuclear peak: 0 TWh in 2025 against 171 TWh in 2001.
- 1 country exited nuclear by 2025, including Germany.
- 19 countries have reached "nuclear share over 20%" at some point through 2025; the earliest crossing in Ember's series is the United States in 2001.
- 12 countries have reached "nuclear share over 40%" at some point through 2025; the earliest crossing in Ember's series is South Korea in 1986.
Top Movers in Nuclear Share
Ember, 2015 to 2025Annual statistics, 2010 to 2025
| Year | Belarus | Slovakia | Pakistan | Finland | Japan |
|---|---|---|---|---|---|
| 2010 | 0.0% | 53.1% | 2.7% | 28.3% | 25.3% |
| 2011 | 0.0% | 54.5% | 4.1% | 31.6% | 14.8% |
| 2012 | 0.0% | 54.7% | 5.4% | 32.7% | 1.6% |
| 2013 | 0.0% | 55.2% | 4.2% | 33.1% | 1.3% |
| 2014 | 0.0% | 57.1% | 4.2% | 34.6% | 0.0% |
| 2015 | 0.0% | 56.9% | 3.8% | 33.9% | 0.4% |
| 2016 | 0.0% | 55.1% | 4.4% | 33.7% | 1.7% |
| 2017 | 0.0% | 55.0% | 6.2% | 33.3% | 2.7% |
| 2018 | 0.0% | 55.7% | 7.2% | 32.5% | 4.5% |
| 2019 | 0.0% | 54.2% | 6.7% | 34.8% | 6.3% |
| 2020 | 0.9% | 54.2% | 7.4% | 33.6% | 4.3% |
| 2021 | 14.0% | 53.0% | 9.6% | 32.7% | 5.9% |
| 2022 | 12.6% | 60.0% | 14.9% | 35.1% | 5.0% |
| 2023 | 28.1% | 62.1% | 15.4% | 42.1% | 7.7% |
| 2024 | 34.2% | 61.8% | 15.3% | 39.5% | 8.4% |
| 2025 | 37.4% | 66.4% | 14.0% | 39.9% | 9.1% |
Nuclear Share and Generation by Country, 2025
30 countries| Country | Share 2025 | Share change since 2020 | Share change since 2015 | Generation 2025 | Change since 2020 | Change since 2015 | Peak year | Below peak |
|---|---|---|---|---|---|---|---|---|
| Belarus | 37.4% | +36.5 points | +37.4 points | 17.0 TWh | +16.6 TWh | +17.0 TWh | 2025 | At peak |
| Slovakia | 66.4% | +12.3 points | +9.5 points | 19.3 TWh | +3.88 TWh | +4.17 TWh | 2025 | At peak |
| Pakistan | 14.0% | +6.6 points | +10.2 points | 24.0 TWh | +13.9 TWh | +19.7 TWh | 2025 | At peak |
| Finland | 39.9% | +6.3 points | +6.0 points | 32.8 TWh | +9.51 TWh | +9.55 TWh | 2023 | 4.4% |
| Japan | 9.1% | +4.9 points | +8.7 points | 94.1 TWh | +51.1 TWh | +89.6 TWh | 1998 | 71.1% |
| Czechia | 42.4% | +4.9 points | +9.8 points | 32.0 TWh | +1.91 TWh | +5.11 TWh | 2025 | At peak |
| South Korea | 29.6% | +1.8 points | -0.5 points | 185 TWh | +24.5 TWh | +19.9 TWh | 2024 | 2.2% |
| Slovenia | 39.0% | +1.4 points | +0.9 points | 5.84 TWh | -510 GWh | +190 GWh | 2014 | 8.3% |
| France | 68.3% | +1.2 points | -7.9 points | 392 TWh | +38.2 TWh | -45.4 TWh | 2005 | 13.2% |
| Argentina | 7.0% | +0.1 points | +2.2 points | 10.8 TWh | +750 GWh | +3.72 TWh | 2025 | At peak |
| South Africa | 4.2% | +0.1 points | -0.7 points | 10.2 TWh | +310 GWh | -2.03 TWh | 2016 | 32.1% |
| Iran | 1.8% | -0.0 points | +0.6 points | 7.35 TWh | +1.02 TWh | +3.85 TWh | 2025 | At peak |
| China | 4.6% | -0.1 points | +1.7 points | 485 TWh | +119 TWh | +314 TWh | 2025 | At peak |
| Brazil | 2.1% | -0.1 points | -0.4 points | 15.9 TWh | +1.81 TWh | +1.13 TWh | 2019 | 1.7% |
| India | 2.6% | -0.3 points | -0.3 points | 53.8 TWh | +9.20 TWh | +15.5 TWh | 2024 | 1.6% |
| Romania | 20.5% | -0.3 points | +2.7 points | 10.2 TWh | -1.27 TWh | -1.44 TWh | 2009 | 13.2% |
| Netherlands | 3.0% | -0.4 points | -0.8 points | 3.98 TWh | -110 GWh | -100 GWh | 2009 | 6.4% |
| Mexico | 2.9% | -0.6 points | -0.9 points | 10.2 TWh | -1.02 TWh | -1.42 TWh | 2018 | 25.0% |
| Russia | 18.3% | -1.6 points | 0.0 points | 219 TWh | +2.71 TWh | +23.2 TWh | 2022 | 2.3% |
| Canada | 13.1% | -1.8 points | -2.2 points | 85.3 TWh | -12.2 TWh | -15.8 TWh | 1994 | 20.3% |
| United States | 17.4% | -2.2 points | -2.2 points | 785 TWh | -5.10 TWh | -12.4 TWh | 2019 | 3.0% |
| Bulgaria | 39.0% | -2.4 points | +7.5 points | 14.9 TWh | -1.77 TWh | -520 GWh | 2002 | 26.5% |
| Sweden | 27.5% | -2.5 points | -7.2 points | 46.9 TWh | -2.26 TWh | -9.41 TWh | 2004 | 39.4% |
| Spain | 18.8% | -3.7 points | -1.9 points | 54.1 TWh | -4.19 TWh | -3.09 TWh | 2001 | 15.1% |
| United Kingdom | 12.4% | -3.8 points | -8.4 points | 36.4 TWh | -13.9 TWh | -34.0 TWh | 1998 | 63.4% |
| Switzerland | 29.9% | -5.2 points | -5.1 points | 19.4 TWh | -4.60 TWh | -3.67 TWh | 2007 | 30.4% |
| Belgium | 33.5% | -5.5 points | -4.6 points | 24.2 TWh | -10.3 TWh | -1.95 TWh | 2021 | 52.0% |
| Hungary | 40.1% | -5.9 points | -12.1 points | 16.1 TWh | +30.0 GWh | +260 GWh | 2019 | 1.2% |
| Taiwan | 1.1% | -10.1 points | -13.0 points | 3.24 TWh | -28.2 TWh | -33.2 TWh | 2014 | 92.4% |
| Germany | 0.0% | -11.4 points | -14.4 points | 0 TWh | -64.4 TWh | -91.8 TWh | 2001 | 100.0% |
Countries that generated at least 10 TWh of electricity in 2025 and have published 2025, 79 in this data, with at least 100 GWh of nuclear in some year. Each is compared with its own 2020 and 2015 values; a blank means Ember has no figure for that year. Peak is the highest annual nuclear generation in the country's series.
Nuclear share over 20%: When Each Country Got There
19 countries| Country | First year over | Share 2025 | Status in 2025 |
|---|---|---|---|
| Japan | By 1985 | 9.1% | Fell back under |
| South Korea | By 1985 | 29.6% | Still over |
| Taiwan | By 1985 | 1.1% | Fell back under |
| United Kingdom | By 1985 | 12.4% | Fell back under |
| Belgium | By 1990 | 33.5% | Still over |
| Bulgaria | By 1990 | 39.0% | Still over |
| Czechia | By 1990 | 42.4% | Still over |
| Finland | By 1990 | 39.9% | Still over |
| France | By 1990 | 68.3% | Still over |
| Germany | By 1990 | 0.0% | Fell back under |
| Hungary | By 1990 | 40.1% | Still over |
| Slovakia | By 1990 | 66.4% | Still over |
| Slovenia | By 1990 | 39.0% | Still over |
| Spain | By 1990 | 18.8% | Fell back under |
| Sweden | By 1990 | 27.5% | Still over |
| Switzerland | By 2000 | 29.9% | Still over |
| United States | 2001 | 17.4% | Fell back under |
| Romania | 2009 | 20.5% | Still over |
| Belarus | 2023 | 37.4% | Still over |
First year in Ember's annual series with a share at or above 20%. "By" means the country's series already started over the line, so the true year is earlier or unknown.
Nuclear share over 40%: When Each Country Got There
12 countries| Country | First year over | Share 2025 | Status in 2025 |
|---|---|---|---|
| Taiwan | By 1985 | 1.1% | Fell back under |
| South Korea | 1986 | 29.6% | Fell back under |
| Belgium | By 1990 | 33.5% | Fell back under |
| France | By 1990 | 68.3% | Still over |
| Hungary | By 1990 | 40.1% | Still over |
| Slovakia | By 1990 | 66.4% | Still over |
| Sweden | By 1990 | 27.5% | Fell back under |
| Bulgaria | 1994 | 39.0% | Fell back under |
| Switzerland | By 2000 | 29.9% | Fell back under |
| Slovenia | 2022 | 39.0% | Fell back under |
| Czechia | 2023 | 42.4% | Still over |
| Finland | 2023 | 39.9% | Fell back under |
First year in Ember's annual series with a share at or above 40%. "By" means the country's series already started over the line, so the true year is earlier or unknown.
Countries That Have Exited Nuclear
1 country| Country | Peak year | Peak generation | Generation 2025 | Near zero since |
|---|---|---|---|---|
| Germany | 2001 | 171 TWh | 0 TWh | 2024 |
Exit means a peak of at least 1 TWh in the series and under 100 GWh in both 2025 and the year before. Near zero since is the first year of the unbroken run under 100 GWh that continues to 2025. A country with only one near zero year is not counted, because a single year can be a gap in Ember's series.
Source: Ember (ember-energy.org), licensed under CC BY 4.0. Data as of 2025. Annual statistics from Ember, complete years to 2025.