Japan Restarts Nuclear Power at Kashiwazaki Kariwa After 14 Years in the Dark

Alex Kimani

Thu, February 12, 2026 at 2:30 AM GMT+9 2 min read

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Japan’s Tokyo Electric Power Company (TEPCO) has restarted Unit 6 of the Kashiwazaki-Kariwa nuclear power plant, following a 14-year shutdown following the 2011 Fukushima disaster. The 1,360 MW reactor is the first unit to come online since the nuclear accident that saw Japan halt operations at all its nuclear plants pending regulatory changes.

The accident was caused by the 9.1-magnitude T?hoku earthquake - the third-largest in the world since 1900 - that triggered a tsunami, resulting in electrical grid failure and damage to nearly all of the power plant’s backup energy sources. With a total capacity of roughly 7,965 MW, the Kashiwazaki-Kariwa Nuclear Power Plant is the largest in the world.

TEPCO has implemented extensive, multi-layered safety enhancements at the Kashiwazaki-Kariwa Nuclear Power Plant to prevent accidents, particularly focusing on tsunami, earthquake, and terrorism risks. The company has constructed a 15-meter-high reinforced concrete seawall (extending 1,000 meters) to protect against tsunamis far exceeding the predicted maximum of 7-8 meters; critical buildings, including reactor and turbine buildings, have been fitted with heavy, watertight doors and barriers to prevent water from entering during a flood while essential equipment and emergency diesel generators have been moved to higher ground (up to 35 meters) to remain operational if the site floods.

Similar to many Western nations, Japan is doing a 180 on nuclear power after virtually ditching the power source as it looks to enhance energy security, reduce heavy reliance on expensive imported fossil fuels, meet rising electricity demand (including for AI data centers), and achieve 2050 carbon neutrality goals. Japan imports 60-70% of its electricity resources. In 2024, the country spent nearly $70 billion on liquefied natural gas (LNG) and coal imports, with nuclear power offering a cheaper, home-grown alternative.

Despite a steadily shrinking population and declining household energy consumption, Japan’s total electricity demand is projected to rise due to a surge in AI data center construction and semiconductor manufacturing. Japan’s electricity consumption from data centers is projected to more than triple, from 19 TWh in 2024 to between 57 TWh and 66 TWh by 2034, fueled by 4 trillion yen ($28 billion) investments by cloud providers like Google and Microsoft.

By Alex Kimani for Oilprice.com

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