Japan’s power utility Kansai Electric Power has announced the resumption of a feasibility survey to assess the potential construction of a new reactor at its Mihama site in Fukui Prefecture (Japan). The project had been suspended following the 2011 tsunami, which triggered the country's worst nuclear accident. The renewed survey will examine topography, geology, and other site-specific factors, according to the company.
This move marks the first concrete step by a Japanese utility toward building a new nuclear reactor from scratch since the Fukushima disaster. Kansai Electric is currently Japan’s largest nuclear operator by number of reactors in operation, with seven units online. The Mihama nuclear power plant comprises three reactors; two were permanently shut down in 2015, while the third remains operational, with a capacity of 780 MW.
In February 2025, the Japanese government updated its Basic Energy Plan, setting a target for nuclear power to provide 20% of the country’s electricity by 2040. The plan also supports the construction of new reactors at existing nuclear sites.
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