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Japan restarts world’s largest nuclear plant for first time since Fukushima disaster

Zaporizhzhia nuclear power plant in Ukraine, date and time undisclosed. (Photo via Wikimedia Commons)
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Zaporizhzhia nuclear power plant in Ukraine, date and time undisclosed. (Photo via Wikimedia Commons)
January 22, 2026 05:47 AM GMT+03:00

Japan on Wednesday restarted a reactor at the world’s largest nuclear power plant, marking the facility’s first return to operation since the 2011 Fukushima nuclear disaster, according to Kyodo News.

The No. 6 reactor at the Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture was brought online after a final inspection was completed and reported to regulators earlier in the day.

Plant idle since 2012 after Fukushima disaster

The 8.2-gigawatt Kashiwazaki-Kariwa facility, which has seven reactors, has remained idle since 2012 following the tsunami-triggered accident at the Fukushima Daiichi Nuclear Power Plant.

Kashiwazaki-Kariwa uses the same type of boiling water reactors as Fukushima Daiichi and is operated by Tokyo Electric Power Company (TEPCO).

The restart marks the first reactor brought back online by TEPCO since the 2011 accident.

A partial view of the Dimona nuclear power plant in the southern Israeli Negev desert, on September 8, 2002. (AFP Photo)
A partial view of the Dimona nuclear power plant in the southern Israeli Negev desert, on September 8, 2002. (AFP Photo)

Restart delayed by technical issue

The reactor restart was originally scheduled for Tuesday but was postponed after a last-minute alarm related to control rods malfunctioned during a test.

TEPCO later said the issue was resolved after a successful final inspection, allowing the reactor to resume operations on Wednesday.

Part of broader nuclear restart policy

When fully operational, Kashiwazaki-Kariwa is the world’s largest nuclear power facility.

It remained offline for years due to public safety concerns and doubts over TEPCO’s ability to manage the complex following the Fukushima disaster.

The restart of the No. 6 reactor marks the 15th nuclear reactor to resume operations since 2011 among Japan’s 33 operable reactors, as the government seeks to increase the use of nuclear energy.

January 22, 2026 05:47 AM GMT+03:00
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