Ohi Unit 3

Ohi 3 is a 1,127 MWe (net) Kansai Electric PWR. It briefly ran in 2012-2013 under a political restart decision, went offline in September 2013, and restarted under the new NRA standards in March 2018; it is operating.

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

Current state

Notes

shut down is the September 2013 shutdown that followed the 2012 interim restart; the unit was first idled in 2011. JAIF gross 1,180 MWe.

Timeline

• 2012-07 — Ohi 3 and 4 restarted under an interim government decision, the only Japanese reactors to run in 2012-2013. (source)
• 2013-09 — Ohi 3 and 4 were taken offline for routine inspections. (source)
• 2017-05-24 — The NRA officially approved Ohi 3 and 4. (source)
• 2018-03-14 — Kansai restarted Ohi 3; it reached criticality the next morning. (source)
• 2018-04-10 — The unit resumed commercial operation. (source)
• 2025-09-10 — Ohi 3 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. Ohi 3 reaches critical milestone in restart — World Nuclear News, checked 2026-10-11