Japan and South Korea Burn More Coal as Iran War Lifts Asian LNG 62%

Japan and South Korea Burn More Coal as Iran War Lifts Asian LNG 62% Seoul and Tokyo are leaning on coal and pushing regional energy cooperation as the Iran conflict strips roughly 30 bcm from global LNG supply. South Korean coal-fired power generation jumped 39.7% year-on-year in April (2026-04), rising to 10,733 gigawatt-hours, the biggest increase since August 2019, according to Korea Power Exchange data cited by Reuters. Japanese coal-fired supply rose 11.1% over the same month, the fastest pace in at least a year. Both moves came as the war involving Iran disrupted liquefied natural gas shipments and pushed prices higher.^5,2 The switch matters because Japan and South Korea are two of the world's largest LNG importers, and their retreat to coal is a direct demand response to a supply shock that is not yet resolved. Asian spot LNG prices have risen 62% since the war began, while the Newcastle coal benchmark has climbed 13%, Reuters reported. When gas gets that expensive that fast, utilities reach for the cheapest available megawatt-hour.^5,2 The scale of the disruption is large. Henning Gloystein of Eurasia Group, quoted by The Guardian, said almost 30 billion cubic metres of LNG have been lost from the global supply chain, with more than 80% of that disappearing from the market at once. Iran's blockade of the Strait of Hormuz, which normally handles close to 20% of global LNG flows, sits at the centre of the squeeze.^3,4 Damage to Qatar's liquefaction infrastructure has removed around 12.8 million tonnes per annum of supply, with recovery timelines stretching up to five years, according to figures cited by databiztimes.com. Qatar is the world's second-largest LNG supplier, and roughly 17% of its export capacity was disrupted after Iranian retaliation to U.S.-Israeli strikes. Leading energy consultancies have collectively cut global LNG supply projections by as much as 35 million tonnes.^4,6 That is the backdrop to the political response. South Korean Finance Minister Koo Yun-cheol called for stronger regional cooperation to face mounting economic uncertainty, in remarks reported by Yonhap. Seoul has prepared an additional budget of 26.2 trillion won, about $17.7 billion, to support its economy through the shock. The appeal frames energy security as a shared regional problem rather than a national one.¹ The coal switch is already eating into climate progress. Fei Xu, senior gas analyst at ICIS, said Japan's increased coal generation displaced roughly four LNG cargoes in April (2026-04), about half the annual reduction in imports the government had expected from greener policy. Gas-fired electricity in Japan fell 12.9% to 16,447 gigawatt-hours, while South Korean gas-fired output dropped 6.4%.^6,5 The early-month data show the trend accelerating. During the first ten days of April (2026-04), coal-fired supply was up 18.3% in Japan and 14.7% in South Korea, while gas-fired power fell 23.4% and 12.2% respectively, Reuters reported. The summer adds pressure: analysts said utilities are leaning harder on coal to cover demand during nuclear plant maintenance ahead of the season.^5,2 There is a geopolitical dividend for others. The Economist reported that Russia and China see opportunity in Asia's oil shock, with Moscow's leverage rising whenever crude trades above $100 a barrel. A prolonged Hormuz disruption pushes Asian buyers toward suppliers outside the Gulf, and the obvious beneficiaries are the producers Washington would least prefer.⁷ Not every signal points the same way. JKM spot carries a bearish lean in our signal set, a reminder that the 62% spike reflects a war premium that can deflate quickly if Hormuz reopens or Qatari volumes return faster than the five-year worst case implies. JKM was last assessed around $15.31. The speed of any supply normalisation, not the headline shock, will set the next move.⁴ The trade that matters now is the spread, not the level. Newcastle physical coal near $126 a tonne and a 13% rally tell you the switching economics have already moved; the question is how much further Asian utilities can lean on coal before stockpiles and emissions targets bind. A heatwave in Vietnam pushed coal-fired generation there up 12.3% to a record 17,864 gigawatt-hours in April (2026-04), a sign the regional pull on thermal coal is broad.^5,6 Watch three things. Whether Qatari export capacity recovers faster than the five-year guidance, whether Japanese and Korean nuclear returns from summer maintenance ease the coal call, and whether Seoul's cooperation push turns into concrete joint procurement or stays rhetorical. Until LNG flows normalise, coal is the marginal fuel across North Asia, and every week of disruption hardens that habit.^6,2