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Maguire: Japan's fossil-fuel power output falls again as nuclear production rises.

Japan, one of the largest importers of oil, coal and gas, has reduced fossil fuel electricity production to its lowest level in more than a decade by 2025. This is largely due to a continuing recovery in nuclear energy output.

The?fleet? of Japan's nuclear reactors generated the most electricity in 2012 since the?a?tsunami caused a meltdown of the Fukushima nuclear power plant, which led to a shutdown of many of the country's reactors.

Japan's nuclear recovery has provided utilities with a record amount of clean energy since 2010. It also allowed power companies to reduce the use of gas-fired plants to its lowest level in at least six year.

In 2026, Japan's energy shift away from fossil fuels is likely to accelerate as it restarts Kashiwazaki - Kariwa's world's biggest nuclear reactor and adds additional renewable energy production capacity.

The steady decline of fossil fuel production in such an important economy will be a source of concern for natural gas exporters. They will have to find other buyers for any extra gas they intend to sell in 2026 or beyond.

CLEAN?MOMENTUM

Japan's electricity production system has increased output by a large amount from clean energy sources in 2025.

Ember data shows that from January to October, the generation of bioenergy plants, solar and wind farms, and nuclear reactors?all increased at least 10% in comparison to the same month in 2024.

Bioenergy and solar energy sources registered their highest-ever share of total utility electric supplies at 7% and 14%, respectively. Nuclear reactors produced over 10% of the total utility electrical supply for the first since 2011.

The total amount of clean electricity produced during the first ten months of 2025 reached 326.3 terawatt-hours (TWh), an increase by 9% from the same period in 2024, and the highest output for a full year since 2010.

NUCLEAR DRIVE

The growth in clean energy supply seen over the past few years has been driven by Japan's steady return of its nuclear reactor fleet.

Japan's authorities have gradually restarted the reactors after the shutdown of all 54 reactors. The generation has risen from less than 5 TWh to close to 78TWh by 2025.

Japan has restarted fourteen of the 33 reactors still operational in the country. It plans to reboot two reactors at the Kashiwazaki Kariwa nuclear power station over the next few months.

As Japan's new prime minister Sanae Takaichi pledged during her election campaign to increase local electricity supply, reduce electricity costs, and reduce fossil fuel imports, it is expected that more nuclear power will be restarted.

In 2024, Japan spent 10.7 trillion Japanese yen (68 billion dollars) on imported coal and liquefied gas. This was a tenth its total import cost.

Imports are expected to fall as the country's nuclear power and clean energy assets continue their growth.

As Japan's imports decline, gas and coal exporters will suffer. However, as utilities increase electricity production from nuclear reactors, and reduce output from plants which burn imported natural gas, Japan's energy supplies should become cleaner and more affordable.

These are the opinions of the columnist, an author for.

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(source: Reuters)