Takahama Unit 4

Takahama 4 is an 830 MWe (net) Kansai Electric PWR that first restarted in February 2016 but tripped days later and was then held offline by a court injunction until May 2017. It has operated since and resumed commercial operation after its latest inspection in November 2025.

Background: Palisades fuel loading: Holtec restart timeline and what comes next · NRC reactor licensing process, explained

Current state

Notes

years offline uses the first (Feb 2016) restart.

Timeline

• 2011-07-21 — Takahama 4 was shut down. (source)
• 2015-02-12 — The NRA officially approved Takahama 3 and 4. (source)
• 2016-02-26 — Takahama 4 restarted, then shut down automatically on 29 February after a main transformer/generator fault. (source)
• 2017-05-17 — Kansai restarted Takahama 4 after the Osaka High Court lifted the Otsu injunction. (source)
• 2017-06-16 — The unit resumed commercial operation. (source)
• 2025-11-13 — Takahama 4 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

1. Current Status of Nuclear Power Plants in Japan as of August 7, 2026 — Japan Atomic Industrial Forum (JAIF) (primary), checked 2026-10-11
2. Nuclear Power in Japan — World Nuclear Association, checked 2026-10-11
3. Japanese reactor restarts after lifting of injunction — World Nuclear News, checked 2026-10-11
4. Takahama-4 Reactor Fails Grid Connection in Japan — World Nuclear Industry Status Report, checked 2026-10-11