Hokkaido Electric Declines to Date Tomari Restart as Tsunami Wall Review Continues
Tomari's indefinite offline status keeps Hokkaido burning imported LNG and coal, with no timeline offered by the utility.
Hokkaido Electric Power's president declined to specify when the Tomari nuclear plant will restart, saying the impact of a tsunami wall accident remains under close review, Hokkaido Shimbun Digital reported. No timetable was given.3
Hokkaido operates a grid with limited interconnection to Honshu, so the island cannot draw on mainland surplus generation when its own reactors are down. Japan's renewable buildout, which Japan NRG Weekly has documented as relying heavily on FIT-backed projects and site-specific small hydropower development in mountainous regions, does not solve Hokkaido's baseload problem while Tomari sits idle.2,3
Japan's nuclear generation recovered to 101.0 TWh in 2025 and is projected to reach 123.3 TWh by 2035, according to GlobalData, but capacity is expected to stay mostly flat through 2029, with gains beginning only in 2030.3 Each month Tomari stays offline pushes that curve lower in the near term.
The Hokkaido Shimbun report gave no detail on what the accident involved, when it occurred, or whether Hokkaido Electric has notified the Nuclear Regulation Authority. Without that information, the market cannot estimate the delay — a minor construction defect resolves faster than a regulatory investigation.3
Waste management, licensing delays and public resistance already weigh on Japan's wider restart programme, asian-power.com reported. Lengthy approval cycles threaten to stretch timelines as waste storage remains unresolved. Hokkaido Electric's refusal to name a date fits that established pattern.3
Attaurrahman Ojindaram Saibasan, power analyst at GlobalData, said existing plants from the pre-2011 fleet are being requalified alongside safety upgrades, but community mistrust, slow radiation safety reviews and unresolved issues continue to drag. He said Japan could reach around 20% to 22% nuclear generation share by 2030 if those measures are executed well, lowering emissions and reducing dependence on imported fuels. "If not, nuclear will struggle," he said.3
By 2010 Japan had 54 operational reactors providing around 25% of its electricity, with the government aiming to expand that share to roughly 50% by 2030, the Economist reported. Fukushima ended that trajectory. Japan's current energy strategy, released last year, targets renewables at between 40% and 50% of electricity generation by 2040, up from around 25% at the time of publication, while researchers from Lawrence Berkeley National Laboratory estimate renewables could reliably generate 70% by 2035.1
The direct market read-through is to LNG and thermal coal. Each reactor that stays offline longer than expected adds to Japan's import requirement.3 JKM, the Asian LNG benchmark, stood at $27.51 per MMBtu at Friday's (2026-09-19) close, reflecting tight global supply, and Newcastle physical coal was $137.05 per tonne at the same session, with Hokkaido's coal-fired fleet contributing to Japan's continuing thermal demand.
Uranium equity proxies pointed lower at Friday's (2026-09-19) close. The URA ETF fell 2.94% to $41.65, and the coal ETF closed at $25.00, down 3.10%. Neither move is large enough to attribute specifically to the Hokkaido announcement; the VIX closed at 14.81, down 4.08%, suggesting no broad risk-off backdrop.3
The next concrete signal is whether Hokkaido Electric discloses more detail on the accident, or whether the Nuclear Regulation Authority opens a formal review. Traders who had Tomari pencilled in for a 2026 or early-2027 return now have no anchor. How much baseload Tomari would have covered has not been publicly disclosed by the utility, leaving the LNG demand effect open to estimation rather than calculation.3