Best European Energy Data APIs & Terminals (2026): 15 Rated for Builders

How these are scored (for builders)

Each source is scored 0 to 10 on five developer-centric criteria. This is a different lens from a procurement review: it weights how easy the data is to integrate and run, not how prestigious the brand is. For a desk-level vendor view, see our 2026 European Gas & Power Data Provider Ratings.

• Coverage & authority (30%): breadth, and whether the data is primary or official.
• Developer experience (25%): docs, SDKs, formats (JSON over XML over scraping), auth simplicity.
• Latency & granularity (20%): how fresh and how fine-grained.
• Reliability & limits (15%): uptime, rate limits, redistribution rights.
• Value for money (10%): cost against what you actually get.

How the 24 Sep 2026 review was done

We re-checked every entry on 24 Sep 2026. Where an API is keyless, or where we hold a key, we made a live request and read the answer. For the paid products we used each provider's own documentation, price lists and package registries. The scores are the ones set in June; this review corrected the facts behind them, and where a new fact bears on a score, the verdict says so. Prices are published list prices where a vendor publishes one, and are marked as reported where only press coverage exists.

All 15 sources, rated

Each source in one sentence (24 Sep 2026)

1. ENTSO-E Transparency Platform (9.3): As of 24 Sep 2026, ENTSO-E's Transparency Platform is the widest free source of European power fundamentals, but its Web API was down from 30 Aug to 2 Sep 2026, and its day-ahead prices and generation data are not on its list of data free for re-use.
2. GIE AGSI+ / ALSI (9.1): As of 24 Sep 2026, GIE AGSI+ and ALSI are the free standard for EU gas storage and LNG terminal data, with a free key, JSON, a lag of about two gas days and re-use allowed with credit to GIE.
3. Elexon BMRS (Insights) (8.9): As of 24 Sep 2026, Elexon's Insights API is the best free source of GB power data: keyless, JSON or CSV, and under a licence that allows commercial re-use with attribution.
4. Open-Meteo (8.8): As of 24 Sep 2026, Open-Meteo is the quickest way to add weather to an energy model: keyless and free for non-commercial use, with commercial plans from €29 a month.
5. ENTSOG Transparency (8.6): As of 24 Sep 2026, ENTSOG's Transparency Platform is the free, keyless source for European gas pipeline flows, though its terms set a citation format and give no explicit right to redistribute.
6. Energy Quantified (Montel) (8.6): As of 24 Sep 2026, Energy Quantified, now part of Montel, is the most builder-friendly commercial API here, with REST, a WebSocket feed and a Python SDK last released on 16 Sep 2026.
7. Kpler (8.5): As of 24 Sep 2026, Kpler is the pick for LNG cargo and pipeline flow tracking, with a REST API and an official Python SDK, and it publishes no list price.
8. ICIS / Platts / Argus (8.5): As of 24 Sep 2026, ICIS, Platts (S&P Global Energy) and Argus are where you buy settlement-grade price assessments, all behind entitlements and none with a public price.
9. LSEG Workspace / Data Library (8.5): As of 24 Sep 2026, LSEG Workspace with the lseg-data Python library is the strongest terminal for quant desks; Eikon was withdrawn on 30 Jun 2025, and LSEG publishes no price.
10. FRED (St. Louis Fed) (8.2): As of 24 Sep 2026, FRED's keyless CSV endpoint is the simplest free source of oil and gas benchmarks, but every series keeps its owner's terms: the EIA oil prices are public domain and the IMF gas prices are copyrighted.
11. Montel Markets (8.2): As of 24 Sep 2026, Montel Markets is good value for continental prices and news over a REST API with SignalR push, with prices 15 minutes delayed unless you license real-time exchange data.
12. Volue Insight (8.2): As of 24 Sep 2026, Volue Insight suits weather-driven fundamentals work, and its current Python SDK is volue-insight-timeseries, which replaced the archived wapi-python.
13. Bloomberg Terminal (BLPAPI) (8.3): As of 24 Sep 2026, a Bloomberg Terminal pays for itself only when cross-asset coverage matters, at a reported $2,360 to $2,665 per user per month since January 2025, with about 3% more announced from January 2027.
14. EEX / ICE Market Data (8.4): As of 24 Sep 2026, EEX and ICE sell exchange-direct futures data on published fees, for example €550 a month for EEX's real-time power REST API, and neither offers a free API.
15. Nord Pool Data Portal (8.1): As of 24 Sep 2026, Nord Pool sells Data Portal access from €1,200 a year and its Market Data API from €1,250 a year, and republishing its prices needs a separate redistribution licence.

The free core every European energy build should start with

These six come from EU transparency regulation or public bodies, and all six are free to read. The notes below come from our own integration work and from live requests made on 24 Sep 2026.

ENTSO-E Transparency Platform: 9.3

The widest free source for European power: day-ahead prices (document type A44), cross-border physical flows (A11) and actual generation by fuel (A75), across nearly every EU bidding zone. The REST API lives at web-api.tp.entsoe.eu and returns XML; the old transparency.entsoe.eu/api address now serves the website instead. The security token is free but not instant: you register, email ENTSO-E with “RESTful API access” in the subject, and wait up to three working days. The limit is 400 requests a minute per token (no longer per IP), and going over it bans the token for about ten minutes.

Parsing watch-outs: resolution varies by zone (DE-LU and FR prices are PT15M, Switzerland is PT60M), a single delivery day can come back as two TimeSeries with different values, and GB has no day-ahead price or generation data (its flows still publish).

Reliability: the Web API answered 503 from the evening of 30 Aug 2026 until 2 Sep, when ENTSO-E rolled back a failed move to new infrastructure and switched the API back on. Our own monitoring then saw it down again for about 27 hours on 7 and 8 Sep. Throughout the first outage ENTSO-E said the File Library (FMS) kept working. FMS serves the same data items as bulk CSV files at fms.tp.entsoe.eu, with its own login (your account email and password, not the API token) and its own limit of 100 requests a minute. Our ingest is built to fall back to it for day-ahead prices, load, generation, imbalance prices and physical flows; intraday auction prices, outages and installed capacity still come from the Web API only.

Licence: ENTSO-E's list of data free for re-use (CC BY 4.0) omits day-ahead prices (Art. 12.1.D), whose owners are the power exchanges or TSOs, and has no generation items either. Reading them is free; republishing them needs the owner's consent. For DE-LU and NL day-ahead prices, the regulator's SMARD site publishes the same auction results under CC BY 4.0.

GIE AGSI+ / ALSI: 9.1

Gas Infrastructure Europe's storage (AGSI+) and LNG terminal (ALSI) transparency: daily fill, volume, injection, withdrawal and send-out, for the EU and per country. A free key goes in an x-key header and the answer is JSON. GIE allows re-use with credit. What trips people up:

• Numbers arrive as strings, and "-" means no value. Parse to numbers and treat "-" as null.
• data[0] is the newest gas day, and the newest gas day lags by about two days (on 24 Sep 2026 it was 22 Sep).
• A bad key returns HTTP 200 with an “access denied” body, not a 401, so check the body, not the status. Some error bodies echo the key back, so do not log them raw.
• The limit is 60 calls a minute, counted per IP address and per page of results, so every process behind one address shares it.
• The UK is GB* (“United Kingdom (Post-Brexit)”), and every 2026 row in it is flagged as estimated. Plain GB is the pre-Brexit series and has been empty since 2020.
• Screen for bad rows. On 3 Sep 2026 GIE published gas day 1 Sep with Germany at 40,613.86% full and the EU aggregate at 8,912.08%. It has since been corrected, but anything that served it unchecked showed it.

We publish an MIT-licensed, zero-dependency TypeScript client for both APIs: @voltstack.energy/agsi (source on GitHub). It uses your own free GIE key.

Elexon BMRS (Insights): 8.9

The free route to the GB power data ENTSO-E no longer carries: half-hourly generation by fuel (FUELHH), the Market Index price (MID) and the balancing mechanism. Keyless, JSON or CSV, and the BMRS licence allows commercial re-use with the credit “Contains BMRS data © Elexon Limited copyright and database right”. Two cautions: that licence excludes third-party rights Elexon cannot license, and MID is a market index, not the day-ahead auction price (filter on the APXMIDP provider; the N2EX rows read zero). No numeric rate limit is published.

Open-Meteo: 8.8

Temperature, wind and solar irradiance forecasts without a key, the inputs that drive load and renewable output. The free API is for non-commercial use only, capped at 600 calls a minute and 10,000 a day. Commercial use needs a paid plan: API Standard is €29 a month for a million calls, and Professional, at €99, adds historical, ensemble and previous-run data. The data itself is CC BY 4.0.

ENTSOG Transparency: 8.6

Gas pipeline physical flows at interconnection points: Norway, Algeria, TAP, TurkStream and the rest. Keyless JSON (CSV and XML too), 100 records per call unless you pass limit=-1, and a 60-second query timeout. The terms set a citation format and forbid extraction that slows the site, but give no explicit right to redistribute. Pair it with AGSI+ to see supply and storage in one picture.

FRED (St. Louis Fed): 8.2

Brent, WTI and Henry Hub, plus monthly European gas and coal reference series. The keyless fredgraph CSV endpoint is the simplest integration here; send a User-Agent header or the connection hangs. The documented REST API needs a free api_key. Re-use depends on the series, not on FRED: the EIA oil prices are public domain with citation requested, while the IMF European gas price is copyrighted.

When to pay: forecasts, flows and PRA prices

Free official data tells you what happened and what is flowing now. You pay commercial vendors for three things the free sources do not give you: forward forecasts, vessel- and asset-level flow intelligence, and settlement-grade PRA assessments. None of the five below publishes a list price.

• Energy Quantified (8.6): Montel bought it in 2023 and it now trades as Montel Energy Quantified. REST with an X-API-Key header, a WebSocket push feed, and the energyquantified Python SDK (last release 16 Sep 2026). The best pick if you own your modelling layer.
• Kpler (8.5): LNG cargo and pipeline flow tracking over REST, a GraphQL API for maritime data, and the official kpler-sdk Python package. Pay here when cargo-level visibility moves your P&L.
• ICIS / Platts / Argus (8.5): PRA assessments for OTC settlement, all entitlement-gated. Platts now sits in S&P Global Energy (renamed from S&P Global Commodity Insights in November 2025), with the spgci Python client; Argus delivers over REST and SOAP APIs, SFTP and Snowflake; ICIS's API is REST returning XML. Essential if you settle against TTF or NBP assessments.
• Montel Markets (8.2): formerly Montel Online. Continental prices plus a strong news wire, over a JSON web API with SignalR push rather than a raw WebSocket. Prices are 15 minutes delayed unless you buy a real-time exchange licence.
• Volue Insight (8.2): weather-driven fundamentals over REST with OAuth client credentials. The current Python SDK is volue-insight-timeseries; the older wapi-python is archived.

When you need a terminal, not an API

• LSEG Workspace / Data Library (8.5): the best terminal for quant desks. The Python library is lseg-data, version 2 of the Refinitiv Data Library, with .NET and TypeScript versions too. Eikon was withdrawn on 30 Jun 2025. LSEG publishes no Workspace price.
• Bloomberg Terminal / BLPAPI (8.3): unrivalled cross-asset coverage and news; reach for it when FX, rates and equities matter alongside TTF. The blpapi Python package installs from Bloomberg's own index, not PyPI, and needs an entitlement. Bloomberg publishes no price; reported fees since January 2025 are $2,665 a month for one seat and $2,360 a seat for two or more, with a rise of about 3% announced from January 2027.
• EEX / ICE market data (8.4): exchange-direct futures for power, gas and carbon, on published fees. EEX DataSource offers REST, WebSocket and SFTP; its price list of 28 Aug 2026 charges €550 a month each for real-time power and gas over REST. ICE Futures Europe charges $144 a user a month for display. Neither has a free API.
• Nord Pool Data Portal (8.1): the source for Nordic and coupled day-ahead and intraday prices, and for the GB N2EX auction. The Data Portal costs from €1,200 a year and the OAuth2 Market Data API from €1,250 a year; redistribution needs a separate licence. The portal's keyless backend answers only for about the last two months, and the licence terms still apply to it.

Voltstack (disclosed): not rated

As of 24 Sep 2026, Voltstack is a browser-based analytics workspace that puts official European power, gas storage, LNG and REMIT data into dashboards and alerts for traders and analysts on European gas and power desks.

Verdict (24 Sep 2026): Voltstack suits a desk that wants official European power and gas data in dashboards and alerts without building the pipelines itself, and it works alongside a price reporting agency, a flow vendor and an analyst team rather than replacing them.

The /v1 API as it behaves on 24 Sep 2026

• A read-only JSON API at https://api.voltstack.energy/v1, with GET endpoints for power, gas, weather and history built on official sources such as ENTSO-E, GIE, ENTSOG and National Gas.
• Keys go in an X-API-Key header and are issued on request by email to research@voltstack.energy. There is no self-serve key, and the 14-day app trial does not include one.
• Without a key you get a labelled sample: current endpoints answer in full, history endpoints serve only the last 30 days, and an older window returns 401. Each route allows 60 requests a minute per address; keyed calls default to 120.
• History depth, from the API's own earliest-date field: EU gas storage and LNG terminals from 1 Jan 2015 (GIE AGSI+ and ALSI); FRED commodity series (Brent, WTI, Henry Hub, EU gas, coal) from 1 to 2 Jan 2015. Point-in-time vintages are captured forward only, since July 2026.
• No OpenAPI spec and no SDK for the API; documentation is an HTML and PDF specification (v1.13, 23 Sep 2026).
• When ENTSO-E's Web API fails, the ingest is built to fall back to the ENTSO-E File Library for day-ahead prices, load, generation, imbalance prices and physical flows.

We do not rate our own product. Voltstack is listed on the same fields as the fifteen sources and set against the same five criteria in words, but it has no score and no rank.

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Four stacks that actually ship

Every stack starts with the same free official core; the paid layer adds to it rather than replacing it. A commercial product cannot run on Open-Meteo's free tier, which is why the SaaS row pays for it.

Changes and corrections in this review

• ENTSO-E went down. 503s from 30 Aug to 2 Sep 2026, and our monitoring saw a second outage of about 27 hours on 7 and 8 Sep. The File Library stayed up through the first and is the fallback to build.
• ENTSO-E's limit is per token. 400 requests a minute per token; IP-based limits and bans were dropped with the R3 API. The API moved to web-api.tp.entsoe.eu.
• National Gas is REST only. National Gas permanently decommissioned its SOAP APIs on 11 May 2026. The keyless REST API at api.nationalgas.com is now the only live path to GB gas system data. Its data portal disclaimer asks for written consent before reproduction.
• GIE published an impossible row. Germany's gas day 1 Sep, published 3 Sep 2026, read 40,613.86% full and was corrected later. Screen AGSI+ values before you serve them.
• Licences, corrected. June's version implied ENTSO-E and FRED data could be republished freely. ENTSO-E's day-ahead prices and generation data are not on its free re-use list, and FRED series keep their owners' terms.
• Names, corrected. Platts is now in S&P Global Energy; Energy Quantified is part of Montel; Volue's SDK is volue-insight-timeseries; Montel pushes over SignalR.
• Prices, corrected. June's Bloomberg figure of about $2,000 a month was low, and its LSEG figure had no public source, so it is gone. EEX issued a new price list on 28 Aug 2026.

Three shifts builders should track

• Negative prices are a data problem. Parsers that drop the minus sign silently corrupt a series; validate signs on day-ahead prices explicitly.
• 15-minute resolution is spreading. More zones publish PT15M day-ahead data, and hard-coded hourly assumptions will misalign. Make ingestion resolution-aware.
• Upstream outages happen. ENTSO-E's multi-day outage from 30 Aug showed that a single fetch path is not enough. Keep a last-good copy and a second route to the same data.

Quick answers

Skip the integration work

Voltstack reads official European power and gas sources for you, with the deduping and the resolution handling done and a File Library fallback built in, and puts the data into dashboards and alerts. The disclosed entry above says what it does and does not do.

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More European energy research

Disclaimer: This reference is produced by Voltstack Intelligence for informational purposes only and is not a vendor endorsement. Scores reflect Voltstack's builder-centric assessment, set in June 2026 and re-checked against live requests and providers' own documentation on 24 Sep 2026. Voltstack appears as a disclosed entry and is not rated or ranked. Pricing is indicative unless a published list price is cited. Voltstack does not accept payment from rated providers. Corrections to research@voltstack.energy.

Sources: ENTSO-E Transparency Platform and its help centre, GIE (AGSI+/ALSI), ENTSOG, Elexon, National Gas, SMARD (Bundesnetzagentur), Open-Meteo, FRED (St. Louis Fed), Energy Quantified, Kpler, ICIS, S&P Global Energy, Argus, Montel, Volue, LSEG, Bloomberg, EEX, ICE, Nord Pool, and reporting on Bloomberg fees by NeuGroup and ZeroHedge.