GIE ALSI LNG API

Use in your agent

Load recent GIE ALSI EU LNG data into pandas and Parquet. Checked against the provider's documentation on Nov 1, 2026.

Access

• Create a free AGSI or ALSI account and request ALSI access; registration provides a personal API key.
• Set the key in GIE_API_KEY. Send it in the x-key request header and credit GIE ALSI when using the data.

Request

curl 'https://alsi.gie.eu/api?type=eu&from=2026-10-01&to=2026-11-01&page=1&size=300' -H "x-key: $GIE_API_KEY"

Format

Paginated JSON whose data array contains daily EU, country, operator or terminal records with gas-day dates, LNG inventory, send-out, declared capacities, utilization and availability fields.

Load into pandas and Parquet

Needs Python 3 with requests, pandas and pyarrow.

"""Recent GIE ALSI EU LNG data -> pandas -> Parquet. Needs a free API key."""
import os
import requests
import pandas as pd

URL = "https://alsi.gie.eu/api"
HEADERS = {"x-key": os.environ["GIE_API_KEY"]}
BASE = {"type": "eu", "from": "2026-10-01", "to": "2026-11-01", "size": 300}
rows = []
page = 1
while True:
    r = requests.get(URL, headers=HEADERS, params={**BASE, "page": page}, timeout=60)
    r.raise_for_status()
    payload = r.json()
    rows.extend(payload.get("data", []))
    if page >= int(payload.get("last_page", 1)):
        break
    page += 1
df = pd.json_normalize(rows)
df["gasDayStart"] = pd.to_datetime(df["gasDayStart"], utc=True)
df.to_parquet("gie_alsi_eu.parquet", index=False)
print(len(df), "rows", df["gasDayStart"].min().date().isoformat(), "to",
      df["gasDayStart"].max().date().isoformat())

Not run: it needs a free API key.

Limits

• Rate limit: 60 API calls per minute; excess calls enter a 60-second waiting period.
• Page size defaults to 30 records and is capped at 300.
• The API exposes daily storage and LNG inventory reporting currently available on the platforms.

Quirks

• Paginate through last_page; every page is a separate API call.
• Historical coverage begins in 2012 or when a terminal became operational, so terminal histories differ.
• The gas day changes with CET/CEST, and EIC codes or facility ownership can change.

Terms and attribution

• The API is free after registration.
• Credit GIE ALSI as the source; GIE can deactivate keys when source credit is omitted.
• Contributor data is informational and may change, be removed or be amended without notice.

Sources

• https://alsi.gie.eu/account: “The API export format is JSON.”
• https://alsi.gie.eu/account: “Registration is mandatory to be able to use the API.”
• https://www.gie.eu/transparency-platform/GIE_API_documentation_v007.pdf: “On ALSI: historical data since 01/01/2012 or since the date the LNG terminal has become operational”
• https://alsi.gie.eu/data-definition: “Data is updated every day at 19:30 CET and a second time at 23:00 CET.”
• https://alsi.gie.eu/account: “A mention of GIE, AGSI or ALSI (as applicable) as data source is a minimum requirement.”