Kashiwazaki-Kariwa Nuclear Plant Resumes Power Transmission, Boosting Japan’s Energy Supply

The Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture, Japan, has begun transmitting electricity to the Tokyo metropolitan area for the first time in approximately 14 years, marking a significant step in Japan’s efforts to bolster its energy security. The restart of the No. 6 reactor, an Advanced Boiling Water Reactor (ABWR) with a capacity of 1.356 gigawatts, comes after a prolonged period of inactivity following the 2011 Fukushima Daiichi disaster.

Restart Amidst Energy Concerns

Tokyo Electric Power Company Holdings (TEPCO) initiated power transmission on Monday, February 17, 2026 [1]. This move is particularly timely as Japan navigates ongoing concerns about energy supply and rising costs. The plant’s resumption of operations is expected to contribute to a more stable and diversified energy mix for the country.

History and Safety Enhancements

Unlike the Fukushima Daiichi plant, Kashiwazaki-Kariwa was not directly impacted by the 2011 earthquake and tsunami. All seven of its reactors were already offline due to damage sustained in the 2007 Niigata-Chuetsu earthquake [1]. Since then, extensive work has been undertaken to enhance the plant’s earthquake resistance and overall safety features.

Trial Operations and Future Plans

The restart process hasn’t been without its challenges. An initial attempt to restart the unit on January 21, 2026, was halted due to an alarm triggered by a monitoring system [1]. Following repairs, the reactor was successfully restarted on February 9, 2026. Currently, TEPCO plans to gradually increase the reactor’s output to 50% before temporarily halting it for turbine equipment inspection. Full-scale commercial operation is anticipated to commence on March 18, 2026, pending final approval from the Nuclear Regulation Authority [1].

Addressing Past Concerns

The Kashiwazaki-Kariwa plant utilizes boiling-water reactors, the same type as those at the Fukushima No. 1 plant. The shutdown of all reactors across Japan following the 2011 disaster prompted a comprehensive review of safety protocols and regulatory standards. TEPCO has emphasized its commitment to uncompromising safety and disaster-resilience as it brings the plant back into service [1].

Significance for Japan’s Energy Future

The resumption of power generation at Kashiwazaki-Kariwa represents a pivotal moment for Japan’s energy policy. As the country seeks to reduce its reliance on fossil fuels and enhance its energy independence, nuclear power is expected to play an increasingly important role. The successful restart of this major facility demonstrates Japan’s commitment to utilizing nuclear energy as a key component of its future energy mix [3].