Free electricity price API for Europe

1. 1

   Create a key

   Sign up for free and open Connections → Elewatt price API. Tell us where the prices will appear and accept the free-use terms. Your key starts with ew_ and is shown once, so copy it somewhere safe.

2. 2

   Fetch prices

   ShellCopy

   curl -H "Authorization: Bearer YOUR_API_KEY" \
     "https://elewatt.eu/api/v1/prices?zone=ee&date=today&unit=ct_kwh"

3. 3

   Show the link

   If the prices appear on a public website or app, add this link where they are shown or in your footer:

   HTMLCopy

   <a href="https://elewatt.eu">Data from elewatt.eu</a>

   Using the prices only for yourself (Home Assistant, scripts)? No link is needed.

Prices for one zone and one day. Send your key as Authorization: Bearer ew_…. Where you can't set headers, X-API-Key: ew_… or ?api_key=ew_… work too.

Example response (trimmed):

{
  "zone": "ee",
  "date": "2026-10-20",
  "timezone": "Europe/Tallinn",
  "resolution": "native",
  "currency": "EUR",
  "unit": "c/kWh",
  "priceType": "day-ahead spot, excl. VAT and fees",
  "count": 96,
  "prices": [
    { "start": "2026-10-19T21:00:00.000Z", "end": "2026-10-19T21:15:00.000Z", "price": 6.412 },
    { "start": "2026-10-19T21:15:00.000Z", "end": "2026-10-19T21:30:00.000Z", "price": 5.987 }
  ],
  "attribution": {
    "text": "Data from elewatt.eu",
    "url": "https://elewatt.eu",
    "sources": ["Elering", "ENTSO-E"]
  }
}

• start and end are UTC (ISO 8601). A local day has 92–100 slots on daylight-saving change days.
• These are wholesale day-ahead prices: no VAT, grid fees or supplier margin. Negative prices are real and are kept as they are.
• With currency=local, prices for Sweden, Norway, Denmark, Poland, Czechia, Hungary, Romania and Switzerland come in that country's currency. We store prices in EUR and convert them at the European Central Bank reference rate, updated once a day, so they can differ slightly from the local figure the exchange publishes. The response's exchangeRate shows the rate used.
• An empty or partial prices list for tomorrow means the exchange hasn't published that zone yet. We check hourly. Most zones are complete by 15:00 CET, but ENTSO-E publishes some zones (for example GR, NL, HU, SK, RO, HR) late roughly one day in three, sometimes not before 21:00 CET. Treat a day as ready only when it has a full set of slots, and keep polling hourly until then.

Your own prices and on/off hours

When you create or edit a key in Elewatt you can link it to one of your contracts, and optionally to a filter. The response for that contract's zone then has two extra fields per slot:

• total: what you pay for that slot under the contract: spot or your fixed price, supplier margin, grid fee and taxes, with VAT if VAT is on in your account. Same unit as price.
• on: true or false, whether a device on that filter runs in that slot. With resolution=hour an hour is on when at least half its slots are.

{ "start": "2026-10-19T21:00:00.000Z", "end": "2026-10-19T21:15:00.000Z", "price": 6.412, "total": 17.284, "on": true }

The response also names the contract and filter. Change them in Elewatt and the API follows within five minutes; your key stays the same.

Every zone code the prices endpoint accepts. No key needed.

curl "https://elewatt.eu/api/v1/zones"

On the free tier, public use needs a visible link to https://elewatt.eu. Show it near the prices or in the footer of every page that shows them. The link text can be Data from elewatt.eu or Powered by elewatt.eu.

<a href="https://elewatt.eu">Data from elewatt.eu</a>

In a mobile app, put it on the screen that shows prices or on the About screen. Every response also carries an attribution object you can render directly. It lists the upstream sources too (ENTSO-E, Elering, Energinet, HEnEx). Energinet's data is licensed CC BY 4.0, so credit it when you show Danish prices.

Where the prices come from: EE, FI, LV and LT from Elering, DK1, DK2, SE3, SE4 and NO2 from Energinet, GR from HEnEx (the Hellenic Energy Exchange's own results file), and every other zone from the ENTSO-E Transparency Platform, which also fills any gap the first source leaves. Each response names its zone's sources in attribution.sources.

• Free: 2,000 requests per key per day. Home and Business plans: 20,000. Limits reset at 00:00 UTC.
• Each response carries X-RateLimit-Limit and X-RateLimit-Remaining.
• Prices change once a day, so there's no need to poll every minute. Fetch today and tomorrow, cache them, and refresh hourly until tomorrow's list is complete.
• CORS is open, so browser calls work. Your key is visible in the browser, though. Prefer calling from your server.

1. Public use is free with attribution. If the prices, or anything calculated from them, appear on a public website or app, show a visible “Data from elewatt.eu” or “Powered by elewatt.eu” link to https://elewatt.eu as described above.
2. Personal use is free without attribution. Home automation, scripts and dashboards that only you see need no link.
3. Home and Business plans need no attribution and get a higher daily limit. See plans.
4. We check how keys are used. If a public site is missing the link, we'll email you and ask you to add it or upgrade. If nothing changes within 14 days, we revoke the key.
5. Keep your key to yourself, one key per project. Don't resell the data as your own price API or feed.
6. The data comes as is, without guarantees of accuracy or availability. Don't rely on it for trading or billing. Upstream sources: ENTSO-E, Elering, Energinet, HEnEx.
7. We may change these terms or the limits. If we do, we'll email key holders before it takes effect.

Questions or need more requests? Email reedik@elewatt.eu.