The European Union has agreed to extend its gas storage rules until the end of 2027. These rules were originally introduced in 2022 as part of the response to a period of extreme volatility in the energy market and to address risks that became evident after Russia’s invasion of Ukraine. The first framework (Regulation EU/2022/1032) was limited in time and set to expire in 2025. With uncertainty in global gas supply continuing, the EU institutions reached agreement in June 2025 on prolonging the measure, and the formal adoption of Regulation EU/2025/1733 followed on 10 September 2025.
This means that for at least two more winters beyond 2025, gas storage will remain subject to coordinated EU-level targets and monitoring. The purpose is not to replace national responsibility but to ensure that security of supply measures are applied consistently across the internal market.
How the Extended Rules Work
The core obligation, maintaining gas storage levels at 90% before the heating season, remains in place. What changes is how and when this target can be achieved. Instead of requiring the 90% level strictly by 1 November, the new rules give Member States a two-month compliance window between 1 October and 1 December. This allows governments and operators to react to market conditions rather than rushing to fill storage by a single cut-off date.
The annual filling trajectories set by the Commission remain largely indicative. A Member State can decide to enforce stricter trajectories nationally, but at EU level they are no longer binding unless specifically required. Furthermore, if gas prices or supply conditions become particularly difficult, governments may temporarily deviate from the 90% target. The Commission itself also retains the power to lower the obligation for all Member States if maintaining the level would unduly stress the market.
The extension for two years, rather than adopting a longer-term framework, reflects an attempt to balance predictability with flexibility. It keeps pressure on the system to maintain strong reserves but avoids locking the EU into a rigid structure if global gas dynamics change significantly after 2027.
Certification and Monitoring
A key element of the Gas Storage Regulation is the classification of storage facilities as critical infrastructure. This requires operators to undergo certification procedures designed to reduce the risk of external influence over assets essential for EU energy security. The process was rolled out progressively, with national certifying authorities required to issue draft decisions and forward them to the European Commission for opinion before final approval.
Member States are responsible for tracking and reporting storage levels on a monthly basis. The Commission uses this information to monitor compliance and to assess the broader supply situation. Since not every Member State has underground gas storage, the regulation also includes a burden-sharing mechanism: the costs of maintaining high reserves are distributed across the Union, rather than falling solely on countries with large storage capacities. This ensures that benefits of secure supply are matched with shared responsibility.
Practical Outcomes So Far
The experience from the 2024/2025 storage cycle shows how the system has functioned in practice. The EU reached its 90% filling target by 19 August 2024, well ahead of schedule, and stocks continued to build until levels reached more than 95% by 1 November. At that point, reserves stood at nearly 100 billion cubic metres, around one-third of total annual EU gas demand.
During the winter, withdrawals increased compared with the crisis years of 2022 and 2023, when governments had focused on conserving reserves at all costs. By the end of the gas winter on 1 April 2025, storage had been drawn down to 34%, a level consistent with pre-crisis years. This suggests that the regulation has provided stability: storage has been sufficient to cover winter demand without forcing governments into emergency measures or risking depletion before spring.
Key Term: Gas Storage Regulation
The Gas Storage Regulation is the EU’s legislative framework obliging Member States to fill underground gas storage facilities to high levels before winter. It sets filling targets, requires monitoring and reporting, and introduces certification for operators. By recognising gas storage as critical infrastructure, the regulation also seeks to shield the sector from external risks and ensure that infrastructure within the Union is operated in line with security of supply objectives.
What It Means Going Forward
For the period until 2027, the EU gas market will continue to operate under this coordinated storage regime. For suppliers, traders, and utilities, the rules create a structural demand for refilling during the summer period, since the 90% obligation ensures a large seasonal build-up of stocks. At the same time, the introduction of flexibility means that obligations may be relaxed if maintaining the target risks driving up prices or creating imbalances.
The regulation is therefore both a stabilising factor and a variable one. It stabilises the market by guaranteeing storage demand each year, but the final target level may be adjusted depending on circumstances. For businesses, this means that planning for storage cycles remains necessary, but assumptions about exact filling trajectories need to take into account possible adjustments from national authorities or the Commission.
In broader terms, the decision to extend the regulation underlines how much emphasis the EU continues to place on energy security. Gas storage remains central to the strategy of managing winter risks, particularly in a context where global LNG supply and pipeline flows remain volatile. The measure does not eliminate exposure to external shocks, but it reduces the vulnerability of the Union to sudden shortages and helps maintain market confidence.
