Japan is on the brink of a nuclear renaissance, but will the ghosts of Fukushima allow it?
At a Glance
- Japan plans to build its first new nuclear reactor since the 2011 Fukushima disaster.
- The project is spearheaded by Kansai Electric Power Co. at the Mihama Nuclear Power Station.
- Safety, public opposition, and regulatory hurdles remain significant challenges.
- The project could take up to 20 years to complete and cost around one trillion yen.
Japan’s Nuclear Journey: Past and Present
Japan was once a nuclear powerhouse, relying on atomic energy for about 30% of its electricity until the 2011 Fukushima disaster. This catastrophic event, triggered by a massive earthquake and tsunami, led to a nationwide nuclear shutdown and a seismic shift in public opinion. Since then, Japan has danced a delicate waltz with nuclear energy, cautiously restarting reactors under stringent new safety standards.
Fast forward to 2025, and Kansai Electric Power Co. (Kepco) has announced plans to build a new nuclear reactor at the Mihama Nuclear Power Station. This project marks the first of its kind since Fukushima, aiming to bolster Japan’s energy security and carbon neutrality goals. With global energy uncertainties and increasing electricity demands, Japan is once again turning to nuclear power as a stable, low-carbon energy source.
Stakeholders and Their Motivations
At the heart of this nuclear renaissance is Kepco, the utility leading the new reactor project. President Nozomu Mori has emerged as the initiative’s public face, championing nuclear energy as essential for Japan’s future needs. The Japanese government shares this vision, emphasizing nuclear power’s role in achieving energy security and climate objectives.
The Nuclear Regulation Authority (NRA) plays a pivotal role as the gatekeeper of safety approvals and oversight. Meanwhile, local governments and communities in Fukui Prefecture hold significant sway over the project’s progress, as their consent is critical. Major Japanese businesses, eager for stable electricity to power future technologies like AI and data centers, are also in support.
Challenges and Developments
The journey to Japan’s first new reactor is fraught with challenges. Public opposition, regulatory hurdles, and safety concerns loom large. Since the Fukushima incident, only 14 of Japan’s 33 reactors have resumed operations, with many facing delays due to technical and local opposition.
On July 22, 2025, Kepco took its first concrete step, announcing the resumption of geological surveys at Mihama. While construction timelines remain uncertain, this move signals a significant shift in Japan’s nuclear policy. The estimated cost of the project is around one trillion yen, and it could take up to 20 years to become operational. The project is still in its preliminary survey phase, with no construction yet underway.
Potential Impacts and Future Outlook
If successful, the Mihama project could set a precedent for new nuclear construction in Japan, supporting national energy security and decarbonization efforts. It could stabilize electricity supply amid rising demand, particularly from digital infrastructure and AI. However, it may also rekindle public debate and local opposition, especially during the survey and approval phases.
Economically, the project promises large-scale investment, job creation, and potential technological exports. Socially, it could reignite anti-nuclear activism and generational divides in public opinion. Politically, it tests the government’s resolve and regulatory credibility, with potential electoral implications in affected regions.
