Takahama 1 is a 780 MWe (net) Kansai Electric PWR that began operating in 1974, Japan's oldest operating reactor. It restarted in July 2023 after twelve and a half years offline and in 2024 received approval to operate beyond 50 years.
Background: Palisades fuel loading: Holtec restart timeline and what comes next · NRC reactor licensing process, explained
Current state
| Status | Restarted |
| Country | Japan |
| Location | Takahama, Fukui Prefecture |
| Plant | Takahama |
| Unit | 1 |
| Operator | Kansai Electric Power |
| Reactor type | PWR |
| Net capacity (MWe) | 780 |
| Restart type | Post-Fukushima restart |
| Shut down | 2011-01-10 |
| Restarted | 2023-07-28 |
| Years offline | 12.5 |
| Regulator | NRA conformity approval 2016-04-20; beyond-40-year licence 2016-06-20; beyond-50-year operation approved Oct 2024 |
| Local consent | Local consent for Takahama 1 and 2 obtained by April 2021 |
Notes
Beyond-50-year approval (Oct 2024) per WNA.
Timeline
- 2011-01-10 — Takahama 1 entered a periodic inspection outage. (source)
- 2016-04-20 — The NRA officially approved Takahama 1 and 2. (source)
- 2016-06-20 — The NRA approved operation of Takahama 1 and 2 beyond 40 years. (source)
- 2023-07-28 — Kansai restarted Takahama 1; it was connected to the grid on 2 August. (source)
- 2023-08-28 — The unit resumed commercial operation. (source)
- 2025-12-26 — Takahama 1 restarted commercial operation after 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 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
- 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
- Restarted Takahama-1 Now Operating Beyond 40 Years, the Second Case in Japan — JAIF, checked 2026-10-11