European gas storage inventories have dropped to their lowest level for late August since 2013, extending the amount of gas the region needs to inject ahead of the 2026/27 heating season. EU underground storage facilities currently hold around 69.2bn cubic metres. That level leaves inventories about 14.3bn cu m below their position 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. With the summer injection season moving into its final months, the smaller buffer increases reliance on subsequent injections.
September and October injection focus
The gap between current inventories and earlier levels raises the importance of injection rates through September and October. About 39bn cu m has been added to European inventories since injections began in April. During August, net additions 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. This would be required to rebuild inventories towards levels considered necessary for the colder period. The timing of additional injections becomes a key factor for meeting those targets within the remaining filling window.
EU storage targets and late-season procurement conditions
The EU framework requires storage facilities to reach 90% between 1 October and 1 December. Countries facing difficult filling conditions can deviate from the target by as much as 10%. With inventories starting from a lower base, storage operators and suppliers face a more demanding late-season procurement programme than last year.
The main variable is whether injection rates can accelerate sufficiently without stronger storage demand 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 shape how comfortable Europe’s supply position is when heating demand begins to rise.
