Genkai 3 is a 1,127 MWe (net) Kyushu Electric PWR licensed for MOX fuel that restarted in March 2018 after more than seven years offline. It is in operation; a periodic inspection that began in June 2026 is scheduled to end with commercial operation in November 2026.
Background: Palisades fuel loading: Holtec restart timeline and what comes next · NRC reactor licensing process, explained
Current state
| Status | Restarted |
| Country | Japan |
| Location | Genkai, Saga Prefecture |
| Plant | Genkai |
| Unit | 3 |
| Operator | Kyushu Electric Power |
| Reactor type | PWR |
| Net capacity (MWe) | 1,127 |
| Restart type | Post-Fukushima restart |
| Shut down | 2010-12-11 |
| Restarted | 2018-03-23 |
| Years offline | 7.3 |
| Regulator | NRA conformity approval 2017-01-18 (MOX use assumed) |
| Local consent | Saga governor approved restart of units 3 and 4 in April 2017 |
Notes
Per WNN, power generation resumed 2018-04-18 (later than the 25 March plan). JAIF gross output 1,180 MWe; net from WNA. Unit was also briefly offline in late 2022 over the specialised safety facility deadline (WNA).
Timeline
- 2010-12-11 — Genkai 3 entered an outage that lasted through the Fukushima accident. (source)
- 2013-07-12 — Kyushu applied for the NRA conformity review. (source)
- 2017-01-18 — The NRA officially approved Genkai 3 and 4. (source)
- 2018-03-23 — Kyushu began the restart of Genkai 3 by withdrawing control rods. (source)
- 2018-05-16 — Genkai 3 returned to commercial operation. (source)
- 2026-06-30 — Genkai 3 was shut down for a periodic inspection. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
Related units
- Genkai Unit 4 Restarted · Japan
- Hamaoka Unit 3 Cancelled · Japan
- Hamaoka Unit 4 Cancelled · Japan
- Higashidori Unit 1 (Tohoku Electric) Under review · Japan
- Ikata Unit 3 Restarted · Japan
- Kashiwazaki-Kariwa Unit 6 Restarted · Japan
- Kashiwazaki-Kariwa Unit 7 Approved · Japan
- Mihama Unit 3 Restarted · Japan
See all 45 units in the Nuclear Plant Restarts Tracker →
Sources
- Current Status of Nuclear Power Plants in Japan as of August 7, 2026 — Japan Atomic Industrial Forum (JAIF) (primary), checked 2026-10-11
- Current Status of Nuclear Power Plants in Japan as of March 14, 2019 — Japan Atomic Industrial Forum (JAIF) (primary), checked 2026-10-11
- Nuclear Power in Japan — World Nuclear Association, checked 2026-10-11
- Seventh Japanese reactor restarted — World Nuclear News, checked 2026-10-11
- Genkai unit 4 supplying power again — World Nuclear News, checked 2026-10-11