Japan has restarted a reactor at the world’s largest nuclear plant nearly 15 years after a disaster at the Fukushima power plant forced the country to shut all its nuclear reactors.

Reactor no.6 at the Kashiwazaki-Kariwa plant located northwest of Tokyo was restarted on Wednesday and is expected to begin operating commercially next month.

This is the latest installment in Japan’s nuclear power reboot, which still has a long way to go, the seventh reactor is not expected to come back on until 2030, and the remaining five could be decommissioned.

Japan, which had always heavily relied on energy imports, was an early adopter of nuclear power, but these ambitions were scuppered in 2011 by what is now remembered as one of the worst nuclear disasters in history.

Triggered by the most powerful earthquake ever recorded in Japan, the meltdown in the reactors at Fukushima Daiichi led to radioactive leakage.

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