Japan took the final step to allow the restart of the world’s largest nuclear power plant on Monday as the region of Niigata voted to resume ‍operations, a watershed moment in the country’s return to nuclear energy nearly 15 years after the Fukushima disaster. Kashiwazaki-Kariwa, located about 220km (136 miles) northwest of Tokyo, was among 54 reactors shut after the 2011 earthquake and tsunami crippled the Fukushima Daiichi plant in the worst nuclear disaster since Chernobyl. Since then, Japan...