Kashiwazaki-Kariwa Unit 6 Resumes Operation
Tokyo Electric Power Company (TEPCO) successfully restarted Unit 6 of the Kashiwazaki-Kariwa Nuclear Power Station in Niigata Prefecture, Japan, on February 9, 2026. This marks a significant step in Japan's energy strategy, as the unit, an Advanced Boiling Water Reactor (ABWR) with an installed capacity of 1,356 megawatts (MW), had been offline for nearly 14 years following the 2011 Fukushima tsunami and nuclear accident.
The restart follows an initial attempt on January 21, 2026, which was temporarily suspended due to an alarm malfunction related to control rods. TEPCO aims for the unit to achieve full commercial operation around mid-March 2026. Once fully operational, Unit 6 is projected to generate approximately 9,500 gigawatthours of electricity annually.
Displacement of Natural Gas Generation Anticipated
Analysis published on March 2, 2026, suggests that the return of Kashiwazaki-Kariwa Unit 6 to service will likely lead to a reduction in electricity generation from natural gas. This displacement is substantial, with estimates indicating the unit could displace approximately 1.3 million tons of liquefied natural gas (LNG), or 62 billion cubic feet (Bcf) of natural gas imports each year. In 2024, natural gas constituted a significant portion of Japan's energy mix, accounting for 33% of the country's total electricity generation.
Japan, which relies heavily on imports for its natural gas needs, was the world's second-largest LNG importer after China in 2025. The increase in nuclear output is expected to contribute to a continued trend of decreasing natural gas generation, a pattern observed since 2017 as other nuclear reactors have slowly restarted and renewable energy sources, particularly solar, have expanded.
Broader Implications for Japan's Energy Landscape
The restart of Kashiwazaki-Kariwa Unit 6 is a pivotal moment for TEPCO, as it is the company's first reactor to resume operations since the 2011 Fukushima disaster. With this unit back online, Japan now has 15 operating nuclear reactors, contributing to a combined electricity generation capacity of 33 gigawatts (GW). In 2024, the nation's operating nuclear fleet generated 83 terawatthours of electricity, representing 9% of Japan's total electricity output.
This move aligns with Japan's long-term energy policy, which aims for nuclear power to provide approximately 20% of the country's total electricity by fiscal year 2040. The government's updated energy plan, approved in February 2025, shifted its stance from reducing dependence on atomic power to maximizing its use, underscoring nuclear energy's role in achieving carbon neutrality by 2050 and enhancing energy security.
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