European gas storage inventories have fallen to their lowest level for late August since 2013, increasing the amount of gas the region will need to inject before the 2026/27 heating season.
EU underground storage facilities currently hold around 69.2bn cubic metres, leaving inventories 14.3bn cu m below their level at the same stage of 2025.
Storage sites are around 63.28% full, compared with roughly 76% a year earlier. Stocks are also 17.24% below the five-year average, leaving Europe with a materially smaller buffer as the summer injection season enters its final months.
The gap puts increased importance on injection rates through September and October. About 39bn cu m has been added to European inventories since injections began in April, while net additions during August are running at their weakest pace for the month in six years.
Estimates indicate that as much as another 68bn cu m may need to be injected before winter if Europe is to rebuild inventories towards required levels.
EU rules call for storage facilities to reach 90% between 1 October and 1 December, although countries facing difficult filling conditions can deviate from the target by as much as 10%.
The lower starting point means storage operators and suppliers face a more demanding late-season procurement programme than last year. The key variable will increasingly be whether injection rates can accelerate sufficiently without stronger storage demand materially tightening the wider European gas balance.
A reduced storage cushion also leaves the 2026/27 winter market more exposed to weather, LNG availability and unexpected supply disruptions. The pace of injections during the remainder of the filling season will therefore determine how comfortable Europe’s supply position is when heating demand begins to rise.
