Tepco Halts Atomic Reactor Amid Issue With Milestone Restart

Kashiwazaki-Kariwa nuclear power complex.Source: Kyodo News/Getty Images

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By Shoko Oda

January 22, 2026 at 4:02 AM UTC

Updated on

January 22, 2026 at 11:21 AM UTC

Tokyo Electric Power Co. will shut down a reactor at its massive nuclear power plant in Japan’s Niigata prefecture to probe an electrical issue, just a day after it was restarted.

Tepco, the country’s largest utility, suspended the restart process of the Kashiwazaki Kariwa plant on Thursday and will turn off its No. 6 reactor after discovering an issue with an electrical part, according to a spokesperson.