Japan LNG Stocks Drew in Late June as JKM Climbs 40% From Its Trough
Japan's power-sector LNG inventories fell week-on-week even as spot prices briefly dipped in late June, preceding a sharp recovery in JKM to current levels.
Northeast Asian spot LNG prices swung in a narrow range through the final week of June before recovering sharply in subsequent weeks. The JKM benchmark was assessed at the low-USD12s per million British thermal units on June 26 (2026-06-26), having risen from the late-USD11s the previous week, only to fall back to the late-USD11s on June 27 (2026-06-27) on reports of high regional LNG inventories and weak demand. By Tuesday (2026-07-14), JKM had climbed to $16.65/MBtu according to live market data, roughly 40% above that late-June trough.2
The brief dip reflected a physically long near-term market. Japan's Ministry of Economy, Trade and Industry reported LNG stocks for power generation at 2.23 million tonnes as of June 25 (2026-06-25), down 0.14 million tonnes from the preceding week — a week-on-week draw even as spot prices softened. Stocks sat 0.09 million tonnes above the same period in 2025, a thin year-on-year surplus as Japan entered the summer season.2
The recovery in JKM since late June points to strengthening physical pull from Northeast Asian buyers, though the exact demand driver is not fully captured in the late-June data. Japan's summer cooling season drives LNG burn for gas-fired power through rising air conditioning load, and that peak demand period was not yet fully reflected in the inventory period ending June 25. With the year-on-year surplus measured in tenths of a million tonne, any sustained heat wave across Japan, South Korea or Taiwan during July and August could quickly erase that buffer and push utilities back into spot procurement.
On the generation side, KEPCO resumed operations of its repowered Jikumaru hydropower plant in Bungoono City, Oita Prefecture. The facility had operated at 12.5 megawatts under Japan's feed-in tariff program before being shut for refurbishment in May 2021; the restarted plant draws on existing water courses rather than new dam construction, reducing environmental impact.3 Incremental hydro capacity at this scale offsets LNG burn at the margin, most meaningfully during periods of adequate rainfall when reservoir levels support sustained output.
The global storage backdrop in late June offered little support for a sustained LNG rally at the time. European underground gas storage stood at 77.3% of capacity on June 30 (2026-06-30), up from 75.5% the previous week according to AGSI+, a level that limited European demand for spot Atlantic Basin LNG cargoes and left the market for US exports more dependent on Asian pull. US natural gas storage on June 23 (2026-06-23) reached 2,805 billion cubic feet — up 76 Bcf on the week, 25.3% above the same period last year and 14.6% above the five-year average, according to the EIA's weekly storage report — a surplus that has kept NYMEX Henry Hub front-month prices at $2.92 as of Tuesday (2026-07-14) and sustained US export competitiveness into both markets.2
ICE Endex TTF front-month gas sat at €53.60 as of Tuesday (2026-07-14). With European storage comfortably above 75% and still building through the injection season, European demand for spot LNG was not positioned to provide a floor under JKM absent a supply disruption on the continent.
Storage investment within Japan also featured in the late-June period. Storage projects accounted for roughly 60% of all successful bids in the fiscal year according to data reviewed in Japan NRG's weekly analysis, a signal that domestic utilities have been prioritising inventory capacity and supply resilience over exposure to spot market swings.1
Whether JKM can hold near its current level depends substantially on how quickly Japan's summer cooling demand translates into LNG burn through July and August. The next METI weekly inventory release will show whether the draw pace that emerged in the week ending June 25 (2026-06-25) has extended into early July and whether the year-on-year inventory surplus — thin to begin with — has narrowed further or held.2