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Gas Infrastructure Europe
International, relevant to the Netherlands

AGSI+, gas storage in Europe (GIE)

AGSI+ (Aggregated Gas Storage Inventory) by Gas Infrastructure Europe shows per day how much gas is in each European country's storage sites, how much was injected and withdrawn and how full they are, also per operator. News every winter: at the end of October 2025 Dutch storage was 73.6 percent full according to CBS (based on AGSI). The website is free to view; the API needs a free personal key and attribution is mandatory.

EnergyEconomyFree keyAPIDownloadEurope · country and operator, per gas day
Reachable · checked 17:23
agsi.gie.eu
Screenshot of agsi.gie.eu

Fill level of Dutch gas storage at the end of October (CBS, based on AGSI): 73.6 percent of capacity in 2025, 21.5 percentage points lower than in 2017

Fill level of Dutch gas storage at the end of October (CBS, based on AGSI), 2017 – 2025, in percent of capacity. The highest point was 2023 (99.3). Figures marked * are provisional.

Source: CBS, Aardgasbalans; aanbod en verbruik (86103NED), opslagcijfers op basis van AGSI (GIE) · opgehaald 25 oktober 2026 · selection: eindvoorraad gasvormig aardgas / opslagcapaciteit gasvormig, maand 10; berekend door Open Data Index uit twee CBS-cijfersOpen the table Single block

What can you do with it?3 ideas

Getting started

How full is the Netherlands before winter?

Follow the fill level from 1 October to 1 November and compare with earlier years. According to CBS it was only 58 percent at the end of October 2021 and 99 percent at the end of October 2023.

Getting started

The Netherlands among its neighbours

AGSI gives the same figures for Germany, Belgium and the rest of Europe. Put the fill levels side by side and see who lags behind.

Advanced

When does withdrawal start?

The daily injection and withdrawal figures show when storage switches from filling to supplying. Put that next to the KNMI temperature.

How to process it4 steps

  1. Look at the website first

    Charts and tables per country and per operator can be viewed without an account. For a few figures you do not need the API.

    https://agsi.gie.eu/

  2. Request a key

    Register for free to get a personal API key. Without a key the API replies "Invalid or missing API key".

    https://agsi.gie.eu/account

  3. Request a country

    With the key you request daily figures per country. This is the call that returned the error without a key (16 Oct 2026); we could not inspect the fields.

    https://agsi.gie.eu/api?country=nl&size=1

  4. Or use the open CBS figure

    CBS publishes the end-of-month stock and capacity of Dutch gas storage monthly, based on AGSI. No key, as OData.

    https://opendata.cbs.nl/ODataApi/OData/86103NED/TypedDataSet?$filter=substringof('MM10',Perioden)&$select=Perioden,EindvoorraadGasvormigAardgas_29,OpslagcapaciteitGasvormig_33&$format=json

Interesting combinations

datum (gasdag)

How much faster does storage empty when it freezes?

Put daily withdrawal next to the daily mean temperature in De Bilt. Cold days need more gas for heating.

Combine with KNMI daily weather data
maand

Does the monthly figure match the daily ones?

Take the AGSI level on the last gas day of the month and compare with the end-of-month stock in 86103NED. Mind the unit: CBS counts million cubic metres; check which unit the AGSI figures use.

Combine with CBS StatLine

Similar sources

  • CBS StatLine

    The CBS natural gas balance (86103NED) has monthly stock and capacity for the whole Netherlands, open and without a key. No daily figures and no other countries.

  • National Energy Dashboard (NED)

    The National Energy Dashboard shows solar and wind generation and gas use in the Netherlands, but not gas storage. It also needs a key.

  • Eurostat

    Eurostat has monthly gas figures per EU country, with a delay, but no daily fill level.

What to watch out for

  • Key and attribution required

    The API is free but only with a personal key. GIE asks you to credit GIE or AGSI and can otherwise revoke the key.

  • A subset of REMIT reports

    The figures come from the storage operators and are, according to GIE, a subset of what is reported under the European REMIT rules. Late corrections occur.

  • Fill level is not a stock for the Netherlands alone

    Gas in Dutch storage can be owned by traders from other countries and flow abroad. Full storage does not mean the gas is for Dutch households.

  • Not checked by us

    Without a key we could not check the API fields, period and units ourselves. What is said here about the API comes from the GIE website and terms.

APIREST (JSON) · read 16 Oct 2026

StandardREST (JSON)docs
Access login

Register for free at agsi.gie.eu/account (name, email, company, consent to usage tracking and attribution). You get a personal key that does not expire; send it in the x-key header. Without a key: HTTP 200 with "access denied" / "Invalid or missing API key" and an empty data list. According to the manual registration is mandatory for non-data providers. tested

Size128

storage sites and groups of 72 operators in 22 countries in the EIC listing, 7 of them in the Netherlands at 5 operators (16 Oct 2026) tested

Formats

json

Base URL

https://agsi.gie.eu/api

Endpoints 5

  • GET/apiDaily figures per gas day for Europe (type=eu), a country, an operator or a single site: stock, injection, withdrawal, capacity, fill level. Without filters the tree as on the front page.
  • GET/api/unavailabilityUnavailability reports (planned and unplanned) per site, with the volume and injection and withdrawal capacity that is lost.
  • GET/api/about?show=listingEIC listing of all operators and their sites, with EIC codes, country, type and ready-made API addresses.
  • GET/api/aboutHierarchical list of operators with logo, publication links, tariffs and sites.
  • GET/api/newsNews and service announcements (corrections, new sites, change of operator); ?url=<id> for a single item.

More APIs with the same key 2 · from the provider's documentation from the description

ALSI (LNG-terminals)

The same API for LNG terminals (in the Netherlands Rotterdam Gate Terminal and EemsEnergy Terminal in Eemshaven, per ALSI's open EIC listing): tank inventory, send-out and capacity. Same key if you choose access to everything.

https://alsi.gie.eu/api
  • GET/apiDagcijfers per terminal: inventory.lng (10³ m³ LNG) en .gwh, sendOut (GWh/d), dtmi, dtrs, status
  • GET/api/unavailabilityOnbeschikbaarheid van terminals (capacity in GWh/d)

IIP (Inside Information Platform, REMIT-berichten)

Urgent Market Messages from infrastructure operators: outages and maintenance at storage sites, terminals, pipelines and fields.

https://iip.gie.eu/api
  • GET/apiUMM-berichten; filters o.a. status (active/inactive/dismissed), published, reportingEntity, balancingZone, asset, direction, message; size standaard en maximaal 300

Filtering from the description

Query parameters you combine: country, then operator, then site (each level needs the ones above), plus dates.

=from/to

Parameters 9

x-keyYour personal API key.from the description
typeEurope, non-EU or additional information (on /api); on unavailability Planned or Unplanned.from the description
countryCountry, e.g. nl or de.from the description
companyOperator (EIC), only together with country; e.g. 21X000000001120V for TAQA Gas Storage.from the description
facilityA single site (EIC), only together with country and company.from the description
date / from / toOne gas day, or a range of gas days. Without from and to: everything since reporting began.from the description
updatedOnly records updated on or after this date; cannot be combined with another date filter.from the description
start / end / end_flagOnly /api/unavailability: period and confirmed or estimate.from the description
page / size / reversePaging: page starts at 1, size default 30 and at most 300; reverse flips the order. last_page in the response says how many pages there are.from the description

Fields of /api (per the manual; numbers come as text) 11

NameTypeMeaning
gasDayStartdatumGasdag waarover gerapporteerd wordt
gasInStoragetekst (getal) · TWhGas in opslag aan het einde van de gasdag
workingGasVolumetekst (getal) · TWhTechnische opslagcapaciteit
fulltekst (getal) · %Vullingsgraad: gasInStorage / workingGasVolume
injection / withdrawal / netWithdrawaltekst (getal) · GWh/dInvoer, onttrekking en netto onttrekking op de gasdag
injectionCapacity / withdrawalCapacitytekst (getal) · GWh/dTechnische invoer- en onttrekkingscapaciteit
consumption / consumptionFulltekst (getal) · TWh / %Alleen bij landen: jaarverbruik en opslag als deel daarvan
trendtekst (getal) · %(injectie − onttrekking) / capaciteit
statustekstE (geschat), C (bevestigd), N (geen data)
updatedAtdatetimeLaatst bijgewerkt
infolijstGekoppelde mededelingen

Limits and pitfalls

  • More than 60 calls per minute (per IP): a 60-second queue with 'too many requests'; keep doing it and you are blacklisted. Every page counts as a call. from the description
  • New figures once a day, at 19:30 CET, with a second round at 23:00 for late operators. Fetching more often is pointless. from the description
  • size at most 300 per page. from the description
  • A missing or wrong key does not give 401 but HTTP 200 with "error": "access denied" and an empty data list. Always check the error field. tested
  • Without a key, /api/about?show=listing (EIC listing), /api/unavailability and /api/news did return data; /api and /api/about did not. The manual still says registration is mandatory for API use. tested
  • Numbers come as text ("65.5257") and missing values as "-". Convert them yourself. from the description
  • History from 1 January 2011 (AGSI) or from the site's start, but not every operator delivered back to 2011; complete from REMIT reporting (7 April 2016). EIC codes can change with a new operator; old series then keep their own code (often PRIOR…). from the description
  • Fill levels above 100% occur: the fill level uses the sellable capacity, while the technical capacity can be higher. from the description
  • Test environment with the same data: https://agsitest.gie.eu/api. agsi.gie.eu has no robots.txt (404). tested
  • Open alternative without a key: CBS table 86103NED (monthly natural gas balance, with end-of-month stock and capacity of Dutch storage, based on AGSI). experience

Try it

No call: we have no key, and according to the manual registration is mandatory for anyone using the API (without a key /api returns "Invalid or missing API key").

Read from User Manual API access to AGSI / ALSI / IIP (v013, 6 March 2025): fields, parameters, paging, limit · Website with charts and tables per country, operator and site (no account). Labels: from the description stated in what the api itself publishes. tested from our own small call. platform applies to every api on this platform, per its documentation. experience learned while building open data index.

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