Japan · 35.542, 135.654Ohi
Ohi, nuclear power plant in Japan, operates 2 pressurized water reactors with 2,254 MW net installed capacity and has been in service since 1979.
Unit Ohi 3 has been operating for 35 years, since 1991. Its 2,254 MW net are enough to supply about 7,100,000 households.
- Country
- Japan
- Units
- 4
- Technology
- PWR
- Net capacity
- 2,254 MWe
- First grid connection
- 1979
- Operator
- Kansai Electric Power
- Owner
- Kansai Electric Power Co
- Status
- Operating
See also: alerts for this plant · every plant in Japan · Vendor: Westinghouse · Vendor: Mitsubishi Heavy Industries · every PWR reactor · how a PWR works
Units
| Unit | Type | Model | Status | MWe | MWt | Construction start | Grid connection | Closure | Load factor |
|---|---|---|---|---|---|---|---|---|---|
| Ohi 1 | Pressurized water (PWR) | Westinghouse 4-loop (WH 4LP) | Shut down | 1,120 | 3,423 | Oct 1972 | Dec 1977 | Mar 2018 | — |
| Ohi 2 | Pressurized water (PWR) | Westinghouse 4-loop (WH 4LP) | Shut down | 1,120 | 3,423 | Dec 1972 | Oct 1978 | Mar 2018 | — |
| Ohi 3 | Pressurized water (PWR) | Mitsubishi 4-loop (M 4LP) | Operating | 1,127 | 3,423 | Oct 3, 1987 | Jun 7, 1991 | — | 86.2 % (2024) |
| Ohi 4 | Pressurized water (PWR) | Mitsubishi 4-loop (M 4LP) | Operating | 1,127 | 3,423 | Jun 13, 1988 | Jun 19, 1992 | — | 97.8 % (2024) |
Data: IAEA PRIS · Wikipedia · updated on Sep 17, 2026
Ohi 1, a 1,120 MWe PWR (Westinghouse 4-loop (WH 4LP)), started construction in 1972 and operated from 1977 to 2018.
Ohi 2, a 1,120 MWe PWR (Westinghouse 4-loop (WH 4LP)), started construction in 1972 and operated from 1978 to 2018.
Ohi 3, a 1,127 MWe PWR (Mitsubishi 4-loop (M 4LP)), started construction in 1987, was connected to the grid in 1991 and is still operating, with a 86.2% load factor in 2024.
Ohi 4, a 1,127 MWe PWR (Mitsubishi 4-loop (M 4LP)), started construction in 1988, was connected to the grid in 1992 and is still operating, with a 97.8% load factor in 2024.
Operator: Kansai Electric Power.
Owner: Kansai Electric Power Co (Ohi 1, Ohi 2, Ohi 3, Ohi 4).