Tepco Restarts Its First Nuclear Plant Since Fukushima Disaster

Japan’s largest utility restarted its nuclear power plant for the first time since the 2011 Fukushima disaster, a watershed moment in the global return back to atomic energy.

Tokyo Electric Power Co.started the No. 6 reactor at its Kashiwazaki Kariwa plant in Niigata prefecture on Wednesday, according to a spokesperson for the utility. Tepco, as the utility is known, had previously intended to resumeoperations on Tuesday, but issues with an alarm system at the facility led to a temporary delay.

Kashiwazaki Kariwa is the world’s biggest nuclear power plant and its restart marks a turning point for Japan, ...