Japan has approved the restart of the world’s largest nuclear power plant, the Kashiwazaki-Kariwa facility, more than a decade after the Fukushima disaster, marking a pivotal shift in the country’s energy strategy towards reducing reliance on imported fossil fuels and meeting climate goals. On Monday, December 22, 2025, Japanese authorities gave the green light to restart the plant, located in Niigata Prefecture about 220 kilometers northwest of Tokyo. The plant, which has been dormant since the 2011 Fukushima meltdown, is operated by Tokyo Electric Power Company (TEPCO), the same utility that managed the stricken Fukushima Daiichi plant. This approval follows a vote by the Niigata prefectural assembly, representing a critical milestone in Japan’s gradual return to nuclear energy after years of public skepticism and regulatory overhaul.
The Kashiwazaki-Kariwa plant is the world’s biggest nuclear facility by capacity, with seven reactors, and its restart is part of Japan’s broader effort to revive its nuclear industry. Following the Fukushima disaster, Japan shut down all 54 of its nuclear reactors, but has since restarted 14 of the 33 that remain operable. The decision to bring Kashiwazaki-Kariwa back online underscores the government’s push under Prime Minister Sanae Takaichi, who took office two months ago, to strengthen energy security and counter high costs from imported fuels. TEPCO plans to reactivate the first reactor, Unit 6, around January 20, 2026, according to reports from public broadcaster NHK.
TEPCO has invested in safety upgrades to prevent a repeat of the Fukushima catastrophe, including new seawalls, watertight doors, and enhanced cooling systems. TEPCO spokesperson Masakatsu Takata emphasized the company’s commitment to safety, stating, ‘We remain firmly committed to never repeating such an accident and ensuring Niigata residents never experience anything similar.’ These measures are intended to address lingering fears, but the company faces significant public resistance from locals who remember the 2011 disaster all too well.
Despite these assurances, local residents remain deeply wary. A survey by Niigata Prefecture in October found that 60% of residents did not believe conditions for the restart had been met, and nearly 70% expressed concern about TEPCO operating the plant. Ayako Oga, a 52-year-old who fled Fukushima in 2011 and now lives in Niigata, voiced typical fears, saying, ‘We know firsthand the risk of a nuclear accident and cannot dismiss it.’ She added that she still suffers from post-traumatic stress-like symptoms and joins protests against the restart, highlighting the emotional toll of the nuclear revival.
Economically, the restart aims to reduce Japan’s heavy dependence on imported fossil fuels, which account for 60-70% of its electricity generation and cost the country about 10.7 trillion yen ($68 billion) last year alone. By increasing nuclear power, Japan hopes to lower energy costs, tackle inflation, and boost its stagnant economy. The government has set a target to double nuclear’s share in the electricity mix to 20% by 2040, up from current levels, as part of its commitment to reach net-zero emissions by 2050. This move is seen as essential for meeting both energy security and climate objectives.
The approval also comes amid rising energy demands, driven by a boom in AI data centers that require substantial power. Joshua Ngu, vice chairman for Asia Pacific at consultancy Wood Mackenzie, noted that public acceptance of the Kashiwazaki-Kariwa restart would be ‘a critical milestone’ toward Japan’s energy and climate goals. However, the memory of Fukushima lingers, and even Niigata Governor Hideyo Hanazumi, who backed the restart, expressed hope for a future less reliant on nuclear energy, reflecting the ongoing tension between necessity and caution.
In conclusion, the restart of the Kashiwazaki-Kariwa plant represents a significant step in Japan’s energy policy, balancing the need for secure, affordable power with ongoing public safety concerns. As the first reactor prepares to come online, the move will test the country’s ability to reconcile its nuclear ambitions with the lessons learned from one of history’s worst nuclear disasters, setting a precedent for other nations grappling with similar energy dilemmas.
