Kyushu Electric is decommissioning Genkai 1 (529 MWe, retired 2015) and Genkai 2 (559 MWe, retired 2019), two older PWRs at a site whose Units 3 and 4 still operate. Both remain in the decommissioning phase, with periodic decommissioning-phase inspections completed in July 2026.
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Current state
| Status | Active dismantling |
| Country | Japan |
| Location | Genkai, Saga Prefecture |
| Site | Genkai |
| Units | Unit 1, Unit 2 |
| Unit count | 2 |
| Reactor types | PWR |
| Net capacity (MWe) | 1,088 |
| Owner / licensee | Kyushu Electric Power |
| Strategy | Immediate dismantling |
| Final shutdown | 2019 |
Notes
Net capacities 529 MWe (WNA) + 559 MWe (WNN). Exact formal retirement dates not in the sources reviewed. Status set to "Active dismantling" with moderate certainty — detailed stage not confirmed.
Timeline
- 2015-03-18 — Kyushu Electric decided to decommission Genkai 1. (source)
- 2019-02-13 — Kyushu Electric's board decided not to restart Genkai 2 and to decommission it. (source)
- 2026-07-09 — Kyushu completed decommissioning-phase periodic inspections of Genkai 1 (7th) and 2 (4th). (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
Related sites
- Biblis Nuclear Power Plant (Units A and B) Active dismantling · Germany
- Brokdorf Nuclear Power Plant (KBR) Active dismantling · Germany
- Brunsbüttel Nuclear Power Plant (KKB) Active dismantling · Germany
- Chinshan Nuclear Power Plant Fuel removal · Taiwan
- Chooz A Active dismantling · France
- Crystal River Unit 3 Site restoration · United States
- Doel Nuclear Power Plant (Units 1-3) Shut down · Belgium
- Dounreay (DFR and PFR fast reactors) Active dismantling · United Kingdom
See all 72 sites in the Nuclear Decommissioning Tracker →
Sources
- Decommissioning of the Genkai Nuclear Power Unit No. 1 — Kyushu Electric Power (primary), checked 2026-10-11
- Genkai 2 to be decommissioned — World Nuclear News, checked 2026-10-11
- Kyushu Electric Power Completes Periodic Operator Inspections (Decommissioning Phase) for Genkai 1 and 2 — Kyushu Electric Power IR (via BigGo Finance), checked 2026-10-11
- Nuclear Power in Japan — World Nuclear Association, checked 2026-10-11