Operator says it does now know when the problem at the Kashiwazaki-Kariwa plant in Niigata province will be solved, after an alarm sounded during start-up

Japan's Kashiwazaki-Kariwa nuclear plant, the world's largest, is set to restart one reactor on January 21, 2026.

Petition signed by 40,000 relays concerns over risk of seismic activity in vicinity of Kashiwazaki-Kariwa plant.