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Mideast fuel risks likely to boost Japan’s nuclear push

  • Spanish Market: Coal, Electricity, Natural gas
  • 21/04/26

Nuclear power could gain further momentum in Japan's energy security strategy, because recent disruptions to crude and LNG supplies from the Middle East have underscored its importance in the resource-poor country, especially as Tokyo pushes for decarbonisation.

Japan has so far secured sufficient crude volumes by releasing emergency stockpiles and sourcing alternative cargoes. But the disruptions have exposed the hard reality of Japan's fuel security, which has compelled the country to increase coal-fired output to conserve LNG for power generation, while it grapples with distribution bottlenecks in petroleum products and oil-derived goods essential to a wider range of industries.

Nuclear energy is a price-insulated and domestically controllable source of baseload power, despite its safety issues and political sensitivity. Rising tensions in the Middle East have once again highlighted the magnitude of the social and economic impact that can arise when energy supply risks materialise, Akio Mimura, chairman of Japan Atomic Industrial Forum, said in his opening remarks at the group's annual conference on 14 April, adding that nuclear is as a "quasi-domestic energy source".

Japan holds roughly three years' worth of uranium stocks, Mimura said. This is compared with crude and oil product reserves covering 243 days of consumption at the end of February, before the onset of the Middle East conflict, as well as LNG inventories equivalent to roughly three weeks of demand. Mimura emphasised nuclear power's supply stability and self-reliance, as well as its role as a decarbonised energy source unaffected by weather conditions.

A 1GW reactor can reduce consumption of natural gas by 850,000 t/yr, oil by 1.55mn kl/yr (26,710 b/d) and coal by 2.22mn t/yr, according to estimates by the trade and industry ministry Meti in June 2024.

Japan's prime minister Sanae Takaichi has aggressively promoted the use of nuclear power well before the Middle East conflict disrupted fuel flows through the strait of Hormuz, citing the need to lower electricity bills. The recent war-driven rise in spot prices for crude, LNG and coal is expected to push up Japan's import costs for such fuels in March-April and be passed onto retail electricity bills from June, during the summer peak demand season. It remains unclear whether Tokyo will resume subsidies for power and gas utility costs, which ended at the end of March.

Japan currently has 33 nuclear reactors with a combined capacity of 33GW, but only 15 reactors are operational after passing stricter safety reviews by the Nuclear Regulation Authority (NRA) and securing approval from local authorities. The latest reactor brought back on line is the 1.4GW Kashiwazaki-Kariwa No.6 unit, which resumed commercial operations on 16 April after a 14-year hiatus following the 2011 Fukushima nuclear disaster.

The government has updated its nuclear policy to enable more effective use of existing reactors, including extending their lifetimes beyond the 60-year limit by excluding offline periods, such as those for safety inspections and count injunctions, from service-life calculations. The NRA earlier this month revised the deadline for installing anti-terrorism facilities, shifting the start of the five-year transitional period from the approval of construction plans to the date of pre-operational inspections for reactors not yet subject to the original deadline.

The NRA's latest decision would allow the Kashiwazaki-Kariwa No.6 reactor to operate until April 2031, instead of September 2029 under the current rules, while plant operator Tokyo Electric Power plans to complete the counter-terrorism work in September 2031. Nuclear supply from the No.6 reactor is expected to reduce LNG consumption by around 1.1mn t/yr, Takaichi said in late March. This would cover around 30pc of Japan's LNG imports passing through the strait of Hormuz, Meti minister Ryosei Akazawa said on 14 April.

Japan's strategic energy plan targets nuclear power to account for 20pc of the power mix in the April 2040-March 2041 fiscal year, up from 11pc in 2024-25, as part of efforts to cut greenhouse gas (GHG) emissions by 73pc from 2013-14 levels. The country's GHG emissions stood at 994mn t of CO2 in 2024-25, down by 29pc from the baseline year, environment ministry data released on 14 April show.


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