Japan’s nuclear restart program rarely grabs headlines, but its impact on energy markets, particularly liquefied natural gas, is becoming increasingly significant. More than a decade after the Fukushima disaster halted nuclear generation, Japan is cautiously reintroducing nuclear power into its electricity mix, triggering a structural shift in fuel demand with global implications.

Before 2011, nuclear energy supplied roughly one-third of Japan’s electricity. After Fukushima, reactors were progressively shut down, and Japan entered a period of near-zero nuclear generation. LNG filled the gap, cementing Japan’s role as the world’s largest LNG importer and a cornerstone of global gas pricing.

That era is now slowly ending.

Reactor restarts began in late 2014 but advanced slowly due to regulatory scrutiny, public opposition, and political caution. By 2020, only four reactors out of more than 30 potentially operable units were running. Today, around 14 reactors are operating, with another restart imminent, lifting nuclear’s share to roughly 9–10% of electricity supply.

The restart of large reactors carries outsized consequences. A single 1.35 gigawatt unit at Kashiwazaki-Kariwa can displace more than one million tonnes of LNG annually once fully operational. As restarts accumulate, Japan’s LNG imports are structurally declining. In 2026, imports are expected to fall by 5–7%, approaching levels last seen in the mid-2000s.

This shift matters beyond Japan. As new LNG supply comes online from the United States and Qatar, Asia is expected to absorb surplus volumes. Yet Japan, the region’s traditional demand anchor, is moving in the opposite direction, reducing baseload gas demand just as global markets search for buyers.

Inflation pressures have reinforced this trend. Policymakers are prioritizing affordability and energy security, making nuclear an attractive stabilizing force. While official targets call for nuclear to supply around 20% of electricity, practical constraints suggest progress will remain gradual. Even so, Japan’s nuclear revival is no longer symbolic, it is reshaping LNG demand and altering the balance of global gas markets.