Japan · 38.399, 141.500Onagawa
Onagawa, nuclear power plant in Japan, operates one boiling water reactor with 796 MW net installed capacity and has been in service since 1984. One more unit has its operation suspended.
Unit Onagawa 2 has been operating for 31 years, since 1995. Its 1,592 MW net are enough to supply about 5,010,000 households.
- Country
- Japan
- Units
- 3
- Technology
- BWR
- Net capacity
- 796 MWe
- First grid connection
- 1984
- Operator
- Tohoku Electric Power
- Owner
- Tohoku Electric Power Co Inc
- Status
- Operating
See also: alerts for this plant · every plant in Japan · Vendor: Toshiba · every BWR reactor · how a BWR works
Units
| Unit | Type | Model | Status | MWe | MWt | Construction start | Grid connection | Closure | Load factor |
|---|---|---|---|---|---|---|---|---|---|
| Onagawa 1 | Boiling water (BWR) | BWR-4 | Shut down | 498 | 1,593 | Jul 1980 | Nov 1983 | Dec 2018 | — |
| Onagawa 2 | Boiling water (BWR) | BWR-5 | Operating | 796 | 2,436 | Apr 12, 1991 | Dec 23, 1994 | — | 63.3 % (2024) |
| Onagawa 3 | Boiling water (BWR) | BWR-5 | Offline, no restart pending | 796 | 2,436 | Jan 1998 | May 2001 | — | — |
Data: IAEA PRIS · Wikipedia · updated on Sep 17, 2026
Onagawa 1, a 498 MWe BWR (BWR-4), started construction in 1980 and operated from 1983 to 2018.
Onagawa 2, a 796 MWe BWR (BWR-5), started construction in 1991, was connected to the grid in 1994 and is still operating, with a 63.3% load factor in 2024.
Onagawa 3, a 796 MWe BWR (BWR-5), started construction in 1998, was connected to the grid in 2001 and is currently suspended.
Operator: Tohoku Electric Power.
Owner: Tohoku Electric Power Co Inc (Onagawa 1, Onagawa 2, Onagawa 3).