Reactors, capacity and uranium mining
Japan has 66 recorded nuclear reactor units across 24 sites in the WhereNuc dataset. Current breakdown: 12 operational, 2 under construction, 4 planned, 21 in suspended operation, 27 permanently shut down. Combined net capacity of the operating fleet is about 11,046 MW (11.0 GW), ranking Japan #8 of 32 countries with operating capacity in this dataset, roughly 3.0% of world operating capacity tracked here. The country’s first reactor reached commercial operation in 1965.
| Site | Status | Units | Net capacity | First online |
|---|---|---|---|---|
| Kashiwazaki Kariwa | Suspended | 7 | 7,965 MW | 1985 |
| Hamaoka | Planned | 6 | 4,803 MW | 1976 |
| Fukushima Daiichi | Shut Down | 6 | 4,546 MW | 1971 |
| Ohi | Operational | 4 | 4,494 MW | 1979 |
| Fukushima Daini | Shut Down | 4 | 4,268 MW | 1982 |
| Genkai | Operational | 4 | 3,312 MW | 1975 |
| Takahama | Operational | 4 | 3,220 MW | 1974 |
| Shimane | Under Construction | 3 | 2,553 MW | 1974 |
| Onagawa | Suspended | 3 | 2,090 MW | 1984 |
| Tomari | Suspended | 3 | 1,966 MW | 1989 |
| Ikata | Operational | 3 | 1,922 MW | 1977 |
| Shika | Suspended | 2 | 1,809 MW | 1993 |
| Sendai | Operational | 2 | 1,692 MW | 1984 |
| Mihama | Operational | 3 | 1,570 MW | 1970 |
| Tsuruga | Suspended | 2 | 1,456 MW | 1970 |
| Ohma | Under Construction | 1 | 1,328 MW | — |
| Tokai | Suspended | 2 | 1,215 MW | 1966 |
| Higashi Dori-1 (Tohoku) | Suspended | 1 | 1,067 MW | 2005 |
| Monju | Shut Down | 1 | 246 MW | — |
| Fugen ATR | Shut Down | 1 | 148 MW | 1979 |
| JPDR | Shut Down | 1 | 10 MW | 1965 |
| Higashi Dori-1 (Tokyo) | Planned | 1 | — | — |
| Higashi Dori-2 (Tohoku) | Planned | 1 | — | — |
| Higashi Dori-2 (Tokyo) | Planned | 1 | — | — |
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