Tomari 1 is a 550 MWe (net) Hokkaido Electric PWR offline since 2011. Its NRA conformity review, applied for in July 2013, is still under way after the regulator prioritised and approved sister unit 3 in 2025.
Background: Palisades fuel loading: Holtec restart timeline and what comes next · NRC reactor licensing process, explained
Current state
| Status | Under review |
| Country | Japan |
| Location | Tomari, Hokkaido |
| Plant | Tomari |
| Unit | 1 |
| Operator | Hokkaido Electric Power |
| Reactor type | PWR |
| Net capacity (MWe) | 550 |
| Restart type | Post-Fukushima restart |
| Shut down | 2011-04-22 |
| Years offline | 15.5 |
| Regulator | NRA conformity review in progress (applied 2013-07-08) |
Notes
No restart target published. years offline to 2026-10-11.
Timeline
- 2011-04-22 — Tomari 1 entered an outage. (source)
- 2013-07-08 — Hokkaido Electric applied for the NRA conformity review. (source)
- 2025-07-30 — The NRA approved Tomari 3 and said it was still reviewing units 1 and 2. (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 3 Restarted · Japan
- 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
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
- Nuclear Power in Japan — World Nuclear Association, checked 2026-10-11
- Tomari 3 meets safety requirements, regulator concludes — World Nuclear News, checked 2026-10-11