Japan Nuclear Power: Generation, Share and Trend
Japan generated 94.1 TWh of electricity from nuclear in 2025, 9.1% of its total, according to Ember. That made it the 6th largest nuclear power producer in 2025 of the 32 countries with Ember data, comparing each country's latest year. Nuclear supplied 8.9% of the world's electricity in 2025. These are annual statistics for 2025, with monthly figures through July 2026; they are compiled from national sources and are not real time.
Key Facts
- Japan generated 94.1 TWh of electricity from nuclear in 2025.
- Nuclear supplied 9.1% of Japan's electricity in 2025.
- Japan was the 6th largest nuclear power producer in 2025 among the 32 countries with Ember data, comparing each country's latest year.
- Japan's nuclear generation in 2025 was 119% higher than in 2020, when it was 43.0 TWh.
- Japan's nuclear generation in 2025 was 21 times the 2015 level of 4.52 TWh.
- Japan's nuclear generation peaked at 326 TWh in 1998.
- Japan's nuclear share in 2025 was close to the world share of 8.9%.
- Japan had 33.1 GW of nuclear generating capacity in 2025.
Key Figures, 2025
| Measure | Value | As of / source |
|---|---|---|
| Nuclear generation | 94.1 TWh | 2025 · Ember |
| Share of Japan's electricity | 9.1% | 2025 · Ember |
| World share of nuclear | 8.9% | 2025 · Ember |
| Rank by nuclear generation (each country's latest year) | 6 of 32 | 2025 · Ember |
| Nuclear capacity | 33.1 GW | 2025 · Ember |
Nuclear Generation Year by Year
Ember annual statistics, 1985 to 2025Annual statistics through 2025, TWh
| Year | Nuclear |
|---|---|
| 1985 | 160 TWh |
| 1986 | 165 TWh |
| 1987 | 189 TWh |
| 1988 | 174 TWh |
| 1989 | 186 TWh |
| 1990 | 195 TWh |
| 1991 | 209 TWh |
| 1992 | 217 TWh |
| 1993 | 248 TWh |
| 1994 | 258 TWh |
| 1995 | 287 TWh |
| 1996 | 297 TWh |
| 1997 | 321 TWh |
| 1998 | 326 TWh |
| 1999 | 317 TWh |
| 2000 | 319 TWh |
| 2001 | 321 TWh |
| 2002 | 314 TWh |
| 2003 | 230 TWh |
| 2004 | 286 TWh |
| 2005 | 293 TWh |
| 2006 | 304 TWh |
| 2007 | 279 TWh |
| 2008 | 252 TWh |
| 2009 | 275 TWh |
| 2010 | 292 TWh |
| 2011 | 163 TWh |
| 2012 | 18.0 TWh |
| 2013 | 14.6 TWh |
| 2014 | 0 TWh |
| 2015 | 4.52 TWh |
| 2016 | 17.7 TWh |
| 2017 | 29.1 TWh |
| 2018 | 49.1 TWh |
| 2019 | 65.6 TWh |
| 2020 | 43.0 TWh |
| 2021 | 61.2 TWh |
| 2022 | 51.8 TWh |
| 2023 | 77.5 TWh |
| 2024 | 84.9 TWh |
| 2025 | 94.1 TWh |
Annual statistics through 2025, % of generation
| Year | Japan | World |
|---|---|---|
| 1985 | 23.8% | n/a |
| 1986 | 24.5% | n/a |
| 1987 | 26.2% | n/a |
| 1988 | 23.1% | n/a |
| 1989 | 23.2% | n/a |
| 1990 | 22.1% | n/a |
| 1991 | 22.9% | n/a |
| 1992 | 23.7% | n/a |
| 1993 | 26.8% | n/a |
| 1994 | 26.2% | n/a |
| 1995 | 28.4% | n/a |
| 1996 | 28.8% | n/a |
| 1997 | 30.4% | n/a |
| 1998 | 30.8% | n/a |
| 1999 | 29.4% | n/a |
| 2000 | 29.0% | 16.6% |
| 2001 | 29.6% | 16.9% |
| 2002 | 28.5% | 16.5% |
| 2003 | 21.1% | 15.6% |
| 2004 | 25.5% | 15.6% |
| 2005 | 25.4% | 15.0% |
| 2006 | 26.1% | 14.7% |
| 2007 | 23.6% | 13.7% |
| 2008 | 21.3% | 13.4% |
| 2009 | 24.7% | 13.3% |
| 2010 | 25.3% | 12.8% |
| 2011 | 14.8% | 11.9% |
| 2012 | 1.6% | 10.8% |
| 2013 | 1.3% | 10.6% |
| 2014 | 0.0% | 10.5% |
| 2015 | 0.4% | 10.6% |
| 2016 | 1.7% | 10.4% |
| 2017 | 2.7% | 10.2% |
| 2018 | 4.5% | 10.1% |
| 2019 | 6.3% | 10.3% |
| 2020 | 4.3% | 9.9% |
| 2021 | 5.9% | 9.8% |
| 2022 | 5.0% | 9.1% |
| 2023 | 7.7% | 9.1% |
| 2024 | 8.4% | 9.0% |
| 2025 | 9.1% | 8.9% |
| Year | Generation | Share | World share | Capacity |
|---|---|---|---|---|
| 2025 | 94.1 TWh | 9.1% | 8.9% | 33.1 GW |
| 2024 | 84.9 TWh | 8.4% | 9.0% | 33.1 GW |
| 2023 | 77.5 TWh | 7.7% | 9.1% | 33.1 GW |
| 2022 | 51.8 TWh | 5.0% | 9.1% | 33.1 GW |
| 2021 | 61.2 TWh | 5.9% | 9.8% | 33.1 GW |
| 2020 | 43.0 TWh | 4.3% | 9.9% | 33.1 GW |
| 2019 | 65.6 TWh | 6.3% | 10.3% | 33.1 GW |
| 2018 | 49.1 TWh | 4.5% | 10.1% | 38.0 GW |
| 2017 | 29.1 TWh | 2.7% | 10.2% | 39.1 GW |
| 2016 | 17.7 TWh | 1.7% | 10.4% | 41.5 GW |
Full year by year history for Japan
Source: Ember (ember-energy.org), licensed under CC BY 4.0. Data as of 2025. World shares are Ember's World totals; ranks compare each country's latest year, which can differ between countries.
Nuclear Generation Month by Month
Ember monthly statistics through July 2026Monthly statistics through July 2026, TWh
| Month | Nuclear |
|---|---|
| 2024-08 | 6.58 TWh |
| 2024-09 | 7.21 TWh |
| 2024-10 | 7.16 TWh |
| 2024-11 | 6.86 TWh |
| 2024-12 | 8.11 TWh |
| 2025-01 | 8.35 TWh |
| 2025-02 | 7.87 TWh |
| 2025-03 | 8.49 TWh |
| 2025-04 | 7.44 TWh |
| 2025-05 | 7.78 TWh |
| 2025-06 | 7.78 TWh |
| 2025-07 | 8.03 TWh |
| 2025-08 | 7.42 TWh |
| 2025-09 | 7.34 TWh |
| 2025-10 | 7.32 TWh |
| 2025-11 | 7.59 TWh |
| 2025-12 | 8.67 TWh |
| 2026-01 | 9.14 TWh |
| 2026-02 | 6.88 TWh |
| 2026-03 | 7.25 TWh |
| 2026-04 | 7.35 TWh |
| 2026-05 | 7.24 TWh |
| 2026-06 | 8.12 TWh |
| 2026-07 | 7.93 TWh |
Source: Ember (ember-energy.org), licensed under CC BY 4.0. Data as of July 2026. Monthly figures for Japan can differ slightly from the annual totals.