Japan's Coal Shift Keeps JKM Spot Capped Below $17
Tokyo's year-long suspension of coal plant restrictions trimmed Japan's LNG demand by roughly four cargoes in April, limiting any recovery in Asian spot gas prices.
The Japan Korea Marker, Asia's benchmark for spot LNG deliveries, held at $16.07 per MMBtu on Friday (2026-07-03), unchanged on the session, as reduced buying appetite from Japan and South Korea continued to weigh on prices that had spiked sharply earlier in the second quarter.3
The demand reduction has been largely policy-driven. In late March 2026, Japan's Ministry of Economy, Trade and Industry announced a one-year suspension — running from April 2026 through March 2027 — of the 50% capacity-factor cap on less efficient coal plants, those with design efficiencies below 42%.2 The move freed utilities to run older generators harder, reducing their exposure to elevated LNG spot prices without waiting for new capacity to come online.
The effect was immediate and measurable. Fei Xu, senior gas analyst at ICIS, said Japan's increased coal generation displaced roughly four LNG cargoes in April 2026 — about half the annual import reduction the government had expected from higher coal utilisation.4 Coal already accounted for roughly 29% of Japan's power mix before the policy change, and utilities are now running older plants at utilisation rates that would have been prohibited six months ago. METI estimated the overall policy shift would save around 0.7 billion cubic metres of LNG over the year.2
The Iran war created the conditions that made this switch economical. Iranian retaliation to U.S.-Israeli strikes disrupted around 17% of LNG export capacity in Qatar, the world's second-largest LNG supplier, pushing spot JKM prices sharply higher in April and early May 2026.4 Japan and South Korea, facing an approximately doubled spot price, chose coal-fired generation over marginal LNG cargoes. Gas-fired electricity generation fell sharply over the same period, according to Kyodo.4
Japan's structural energy position explains why the coal response was both swift and significant. Natural gas accounts for around 32% of power generation, with coal at 28% and nuclear at 9%, and around 98% of domestic gas demand is met by LNG imports.1 The power sector absorbs roughly 55-65% of total LNG consumption, making it the primary demand lever utilities can pull when spot prices run hot.1
The supply arithmetic also limited spot pressure. Of Japan's 66.3 million tonnes of LNG imports in 2025 — down 1.5% year-on-year — roughly 6% transited the Strait of Hormuz from Qatar and the UAE. The majority arrived from Australia (26 Mt), Malaysia (10 Mt), and Russia via Sakhalin-II (5.8 Mt, covered by Japan's existing sanctions exemption).1 With Australian and Malaysian supply continuing to flow, the actual shortfall was narrower than headline disruption figures implied, giving utilities room to switch fuels rather than bid aggressively for spot cargoes.
Not all regional demand is softening. A heatwave across Vietnam pushed coal-fired electricity generation up 12.3% in April 2026 to a record 17,864 gigawatt-hours, adding coal demand that partially offset the reduced LNG buying from Japan and South Korea.4 Newcastle physical coal traded at $121.00 per tonne on Friday (2026-07-03).
JKM consensus signals sit roughly balanced, with bullish and bearish weight nearly equal across 31 active signals. The spot benchmark's cross-sector link runs from JKM through Asian cargo flows and into Japanese power prices — a chain that amplifies any sustained move in either direction through regional generation economics.
METI's coal capacity waiver runs until March 2027. Fei Xu noted that the April 2026 saving was about half what the government had projected from the policy over a full year, suggesting utilities may tighten the gap further in summer months if spot prices stay elevated, or may ease back toward gas if JKM tracks sustainably below $15. The war's duration and whether Qatar's disrupted export capacity returns to the market before monsoon demand peaks in August are the two variables traders are watching now.4