This article first appeared on GuruFocus .
Investors pushed shares of Chubu Electric Power Co. ( CHUEF ) lower after the company disclosed it is investigating possible misconduct related to nuclear safety data, a development that introduced new uncertainty around its restart plans. The stock fell as much as 8.2%, its steepest decline since April 2025, as the announcement prompted concerns that regulatory scrutiny could intensify at a sensitive moment for Japan's power sector.
According to the company, an independent panel of experts has been established to review how earthquake data was selected and presented to Japan's nuclear watchdog. The review is tied directly to the approval process for restarting two reactors at the Hamaoka Nuclear Power Plant, an asset that has been central to Chubu Electric's longer-term operating outlook as the country reassesses the role of nuclear energy.
Three reactors at the Hamaoka facility have remained offline since the Fukushima disaster in 2011, and any adverse findings from the investigation could possibly extend the restart timeline. Beyond the company-specific impact, the episode may also weigh on broader investor expectations around Japan's gradual shift back toward nuclear power, which has been positioned as a way to enhance energy security while supporting emissions reduction goals.
