Nuclear reactors supplied by Mitsubishi Heavy Industries
Mitsubishi Heavy Industries is recorded as the nuclear steam supply system (NSSS) supplier of 20 units in 1 country, per the IAEA PRIS register: 15 operating with 13,340 MWe net and 5 shut down.
Supplier of Japan's pressurized water reactors, in 2-, 3- and 4-loop versions. By country: Japan (20). By technology: 20 PWR. The first unit was connected in 1972 and the most recent in 2009. The most powerful unit in operation is Ohi 3, in Japan, with 1,127 MWe. 5 units have been permanently shut down.
PRIS supplier codes: MHI · Reference · Names per IAEA, Nuclear Power Reactors in the World 2025, table 25
Units with a Mitsubishi Heavy Industries nuclear steam supply system
| Unit | Country | Type | Model | MWe | Grid connection | Status |
|---|---|---|---|---|---|---|
| Mihama 2 |  Japan | PWR | Mitsubishi (2-loop) | 470 | 1972 | Shut down |
| Genkai 1 | Japan | PWR | Mitsubishi (2-loop) | 529 | 1975 | Shut down |
| Takahama 2 | Japan | PWR | Mitsubishi (3-loop) | 780 | 1975 | Operating |
| Mihama 3 | Japan | PWR | Mitsubishi (3-loop) | 780 | 1976 | Operating |
| Ikata 1 | Japan | PWR | Mitsubishi (2-loop) | 538 | 1977 | Shut down |
| Genkai 2 | Japan | PWR | Mitsubishi (2-loop) | 529 | 1980 | Shut down |
| Ikata 2 | Japan | PWR | Mitsubishi (2-loop) | 538 | 1981 | Shut down |
| Sendai 1 | Japan | PWR | Mitsubishi (3-loop) | 846 | 1983 | Operating |
| Takahama 3 | Japan | PWR | Mitsubishi (3-loop) | 830 | 1984 | Operating |
| Takahama 4 | Japan | PWR | Mitsubishi (3-loop) | 830 | 1984 | Operating |
| Sendai 2 | Japan | PWR | Mitsubishi (3-loop) | 846 | 1985 | Operating |
| Tsuruga 2 | Japan | PWR | Mitsubishi (4-loop) | 1,108 | 1986 | Operation suspended |
| Tomari 1 | Japan | PWR | Mitsubishi (2-loop) | 550 | 1988 | Operation suspended |
| Tomari 2 | Japan | PWR | Mitsubishi (2-loop) | 550 | 1990 | Operation suspended |
| Ohi 3 | Japan | PWR | Mitsubishi (4-loop) | 1,127 | 1991 | Operating |
| Ohi 4 | Japan | PWR | Mitsubishi (4-loop) | 1,127 | 1992 | Operating |
| Genkai 3 | Japan | PWR | Mitsubishi (4-loop) | 1,127 | 1993 | Operating |
| Ikata 3 | Japan | PWR | Mitsubishi (3-loop) | 846 | 1994 | Operating |
| Genkai 4 | Japan | PWR | Mitsubishi (4-loop) | 1,127 | 1996 | Operating |
| Tomari 3 | Japan | PWR | Mitsubishi (3-loop) | 866 | 2009 | Operation suspended |
Data: Global Energy Monitor (CC BY 4.0), IAEA PRIS 2025, Wikipedia (CC BY-SA), Wikidata and Wikimedia Commons. Capacities in net MWe unless stated.
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