Japan Nuclear Output Rises 11% but LNG Crunch Keeps Coal in Play
Japan added 9.2 TWh of nuclear generation in 2025, but coal emergency measures and $21 JKM prices show the supply crunch from Middle East conflict persists.
Japan generated 94 terawatt-hours of nuclear electricity in 2025, adding 9.2 TWh on the year for an 11.1% gain, according to the Statistical Review of World Energy published Saturday (2026-08-01). The increase continues a pattern of incremental reactor restarts but lands in a year when Japan simultaneously turned to emergency coal measures and elevated spot LNG purchases to keep the lights on.6
Japan's industry ministry presented a plan in late March (2026-03-27) to temporarily lift restrictions on coal-fired power plants, citing LNG supply disruption caused by Middle East fighting, which an expert panel approved the same day. By May (2026-05-13), coal power generation was rising while gas-fired output was falling, as utilities cut their Middle East LNG purchases. JKM Asian LNG spot prices stood at $21.45 per million British thermal units as of Sunday (2026-08-02), sustaining the cost advantage that coal holds over gas-fired dispatch.5,4,1
Each additional terawatt-hour of nuclear output reduces the volume of gas Japan needs to import at spot prices. The recovery offsets some of that pressure. But Japan lifting coal plant restrictions in March (2026-03-27) while nuclear output was still growing suggests the margin between supply and demand remained tight through early 2026. Japan's utilities had been reducing Middle East LNG dependence over several years before the current conflict exposed the residual exposure.1,6,5
Globally, nuclear generation reached 2,845 terawatt-hours in 2025, up only 1.3% on the year, the Statistical Review showed. The United States led with 826 TWh, representing 29% of worldwide output and nearly 70% more than China's 485 TWh. France followed with 390 TWh, or 13.7% of global generation.6
China tells a different story from the flat global trend. Chinese nuclear output has nearly tripled over the past decade at an average annual growth rate of almost 11%, while global nuclear generation grew just 10.5% over the same ten years — roughly 1% per year. Japan's single-year gain of 11.1% matches China's long-run pace, but it reflects restarting idled reactors rather than commissioning new plant.6
Renewable energy is not yet absorbing the shortfall. Japan had 6.43 gigawatts of installed wind capacity at the end of 2025, with offshore wind reaching just over 0.5 GW in 2026 after commissioning the 220 megawatt Hibikinada and 16.8 MW Goto floating projects, according to Japan NRG Weekly. The government's offshore wind target is 10 GW by 2030 and 30 to 45 GW by 2040. But the Global Wind Energy Council forecasts only 3.5 GW online by 2030 and 8.4 GW by 2035, citing auction-design failures and project delays that emerged after initial ambitions were set.3
Gas's share of Asia's electricity mix fell to 10.2% in 2025 from 13.9% in 2015, data published in June (2026-06-09) showed, as solar and wind absorbed much of regional demand growth. Solar generation rose 636 terawatt-hours globally in 2025, 17 times the growth rate of gas, and met roughly 75% of worldwide electricity demand growth. Japan has tracked that regional shift, though its island geography and minimal grid interconnection constrain how quickly it can replace dispatchable thermal capacity with variable sources.2
The pace of nuclear restarts now matters more than renewable ambitions for Japan's near-term LNG demand. The GWEC gap of 6.5 GW between its 3.5 GW forecast and the government's 10 GW offshore wind target is firm generation Japan will not have by 2030. If nuclear continues adding 9 or 10 TWh annually, it narrows Japan's LNG import exposure without removing it. With JKM above $21 per million British thermal units and coal running as emergency backup, the arithmetic on Japan's power supply has not materially improved from where it stood when the Middle East disruption began.3,6,1