Chubu Electric Power Halts Hamaoka Restart Amid Data Fraud

Chubu Electric Power is set to abandon its plans to restart two reactors at the Hamaoka nuclear plant following a confirmed data-tampering scandal. The company will withdraw its application for the regulatory safety review, a decision driven by the discovery that it submitted figures to regulators that underestimated earthquake risks. This move halts a key step in Japan’s effort to revive nuclear energy and reduce reliance on imported fossil fuels.

The crisis has triggered an immediate leadership shakeup at the utility. President Kingo Hayashi and Chairman Satoru Katsuno are expected to resign, as reported by local media. The independent investigation panel identified a direct causal link between management’s reprimands for delayed review processes and the misconduct by staff who altered the seismic data. The utility is scheduled to address these structural failures during a press conference later in the day.

Regulatory suspension follows whistleblower alert

The Nuclear Regulation Authority suspended the safety review for the Hamaoka plant in late December after receiving information about potential data fraud from a whistleblower in February. The regulator had previously approved the company's estimate of maximum seismic ground motion at 1,200 gal, a metric critical for designing earthquake-resistant infrastructure. The subsequent discovery of underestimated risks invalidated the basis for that approval, forcing the halt of the restart procedures.

Geological risk drives compliance scrutiny

The Hamaoka plant is situated in Shizuoka prefecture near the Nankai Trough, a seismic fault line where a massive Pacific earthquake is anticipated in the coming years. In 2024, the Japan Meteorological Agency issued its first special advisory for a possible megaquake in this region. The accuracy of seismic data is therefore not merely a regulatory formality but a critical determinant of the plant's structural integrity and operational safety in a high-risk zone.

Strategic pivot to carbon neutrality

Japan is actively seeking to revive its atomic energy sector to meet growing energy demands driven by artificial intelligence and to achieve carbon neutrality by 2050. Despite the 2011 Fukushima meltdown, the resource-poor nation is moving away from fossil fuel dependence. The restart of the Kashiwazaki-Kariwa reactor earlier this year signaled this policy shift, making the Chubu Electric Power scandal a significant setback for the broader national energy strategy.