EU gas storage seasonality

Aggregate EU gas storage fill level (% of working gas capacity) through the calendar year. Each gray line is one year from 2011 to 2025, drawn progressively darker toward the present. The purple line is the current year.

Data

• Source: GIE AGSI+ (Aggregated Gas Storage Inventory), published by Gas Infrastructure Europe based on mandatory REMIT reporting by storage operators. This is the same series quoted by Bloomberg and Reuters when they report EU storage levels.
• Series: EU aggregate full — gas in storage as a percentage of working gas volume.
• Frequency: daily. Each gas day is published the following day around 19:30 CET; this plot updates daily at 19:15 UTC.
• Coverage: the dataset starts on 2011-01-01, so the historical fan spans 15 years. Country composition changes over time (e.g. UK reporting ended after Brexit), and AGSI revises working gas volumes at gas-year boundaries — visible as small steps in some years around 1 April and 1 October.
• Feb 29 exists only in leap years; other years connect Feb 28 directly to Mar 1.