1. The short answer
EU gas storage is the amount of natural gas held in underground reservoirs across the bloc, expressed as a percentage of total capacity, and it was 67.12 percent full on 8 September 2026, according to GIE's AGSI data as reported by Rigzone on 10 September 2026. That is a meaningful recovery from the 57.1 percent recorded on 1 August 2026, a historic low for that calendar date, but Wood Mackenzie's assessment, also carried by Rigzone on 10 September, is that winter 2026/27 will end with storage at only 21 percent, the weakest position in nearly two decades.
Storage does not heat a single home directly. What it does is absorb shocks: when a cold spell or a supply disruption such as the ongoing constraints at the Strait of Hormuz hits demand or supply, storage withdrawal covers the gap without an immediate scramble on the spot market. A thinner buffer means prices react faster and harder to the next piece of bad news, which is why the fill level shows up in energy coverage well before winter starts.
2. Who reports the data: GIE and AGSI+
Gas Infrastructure Europe (GIE), the trade association of gas transmission, storage and LNG terminal operators, publishes daily storage data through its Aggregated Gas Storage Inventory platform, AGSI+, at agsi.gie.eu. Storage system operators in each member state report their own inventories, injections and withdrawals to GIE, which aggregates them into national and EU-wide figures, published with roughly a one to two day lag.
Most coverage of a specific fill level, including the figures below, cites GIE data through a secondary source such as Rigzone, S&P Global or Euronews rather than the raw dashboard, and each figure carries the date GIE recorded it, not the date the article was published.
3. Where the fill level actually stands, by date
The table below lists the verified fill levels this page relies on, each with its own reference date. Do not average or extrapolate between rows: storage draws down through autumn and winter as heating demand rises, so a later date is not automatically a higher percentage.
| Reference date | Reading | Source |
|---|---|---|
| 1 August 2026 | EU aggregate 57.1% full, a historic low for that date | Euronews, 20 August 2026 |
| 17 August 2026 | Germany just under 50% full | S&P Global, citing GIE |
| 8 September 2026 | EU aggregate 67.12% full (GIE AGSI data); 19.47 billion cubic metres below the five-year average (Standard Chartered estimate) | Via Rigzone, 10 September 2026 |
No more recent, dated German figure than 17 August was verifiable for this page, so the national and EU-level readings above should not be compared as if from the same day. For a current reading, check GIE's AGSI+ platform, listed in the sources below.
4. The 90 percent target, and how the rules changed on 25 June 2025
The EU's storage target comes from Regulation (EU) 2022/1032, adopted after the 2022 energy crisis, which originally required member states to fill storage to 90 percent of capacity by 1 November each year. A provisional political agreement reached on 25 June 2025 kept the 90 percent target itself but made it considerably more flexible, according to S&P Global's reporting on the deal.
- Member states can now deviate from the 90 percent target by up to 10 percentage points "in case of difficult market conditions such as indications of speculation hindering cost-effective storage filling," with the European Commission able to widen that margin further by delegated act.
- The fixed 1 November deadline became a window running from 1 October to 1 December, with each country's exact date set by its own withdrawal season, and the 90 percent level no longer has to be maintained through 1 December once reached.
- Interim filling trajectories became indicative guidance rather than binding checkpoints, and the regulation's expiry was pushed from the end of 2025 to 2027.
In practice, a country below 90 percent in autumn 2026 is not automatically in breach, provided it can point to market conditions covered by the flexibility clause. The Netherlands used that flexibility directly, lowering its own winter storage target to 64 percent from 74 percent, Bloomberg reported on 11 September 2026.
5. How storage connects to the TTF price you see quoted
The Dutch TTF, Europe's benchmark wholesale gas price, moved above €80/MWh for the first time since early 2023 on 9 September 2026, Bloomberg reported, and Trading Economics recorded €79.52/MWh on 11 September 2026, a 3.08 percent daily fall from €82.05/MWh. A thin storage cushion is one reason the market reacts sharply to news: with less gas held in reserve, buyers compete harder for spot cargoes when demand or supply expectations shift, and that competition shows up directly in the TTF price, which our TTF gas price glossary entry explains in more detail.
Forecasters do not agree on where TTF goes from here. CNBC reported on 27 August 2026 that Europe's low storage could push prices above €100/MWh this winter, while an Oxford Economics forecast cited around the same time, via Euronews, put Q4 2026 to Q1 2027 prices closer to €60/MWh. That spread is a genuine disagreement, not a typo, so keep both figures in mind rather than anchoring on either one.
6. The LNG and Strait of Hormuz connection
Any question about whether Europe can refill storage from here runs into the same supply constraint driving oil prices: the Strait of Hormuz. Qatar is one of the world's largest LNG exporters and ships through the Strait of Hormuz, so the disruption our Hormuz Strait glossary entry and Hormuz crisis hub describe for oil applies to a share of global LNG supply as well. Trading Economics's commentary on 11 September 2026 pointed to "persistent disruptions to LNG supplies from the Persian Gulf" affecting around a fifth of global LNG flows as a factor keeping TTF near its highest levels since December 2022.
This page does not speculate on how the military situation develops. What is verifiable is that Europe competes for LNG on a global market with one major supply route constrained while its own storage buffer is thinner than usual for the date, and both facts point the same direction on price risk.
7. What this means if you live in the UK, the Netherlands or Germany
None of the figures above translate into a household bill on their own, but they set the direction. In the UK, Ofgem's price cap is reviewed quarterly against wholesale costs including TTF, so a benchmark near €80/MWh rather than the roughly €60/MWh some forecasters expect is the kind of gap that shows up in the next cap update; see our Ofgem price cap forecast for the current numbers and review dates.
In the Netherlands, the government's own decision to target 64 percent storage rather than 74 percent this winter is itself a signal that policymakers are trading off storage security against the cost of filling it at current prices, an exchange gas buyers ultimately share in through their contracts.
In Germany, a fill level just under 50 percent as of 17 August 2026 sits below the EU aggregate for the same broad period, and German heating oil buyers already face a fast-moving market; our Germany heating oil price forecast tracks the fuel most directly comparable for households without gas heating. The practical takeaway is the same one that applies to oil: a thinner buffer this year means a bigger price reaction to the next piece of bad news, so budgeting for a range of possible winter costs beats betting on one forecast.