Obtaining API token from Entso-E

EDIT 2024

We have since this article was written implemented an intermediate server that performs the "heavy lifting" of reading prices from the Entso-E API. We have there also implemented some backup mechanisms in case the Entso-E API does not respond (which we have seen from time to time).
We therefore no longer recommend reading directly from the Entso-E, but in stead do the following: Activate "Enable price fetch from remote server" in the configuration but leave the next field blank. Your device will then read from our intermediate server:

(We keep the content of the rest of this article in case anyone uses it as reference.)

(Updated 4-dec-2025 to reflect changes on Entso-E webpage.)

Pow-K+ and the newest version Pow-U equipped with ESP32 microcontroller can read and display hourly energy prices.

The data source is the non-commercial EU-financed page https://transparency.entsoe.eu/

You can register and obtain API token free of charge, and here is the procedure:

1. Go to https://transparency.entsoe.eu/ and click "Sign in" in upper right corner.
2. A new window opens, click on "Register" at the bottom. Fill in your email and select a password, which must be at least 14 character long and must contain at least one special character (other than letter, digit or '@').
3. You'll receive an email requesting you to confirm activation. Click the link in the email, and you're logged in.
4. So far so good - normal stuff.
   Now you need to send them an email to request API token, that information is somewhat hidden in paragraph 2 on this page:
   Send an email to transparency@entsoe.eu with “Restful API access” in the subject line. Indicate the email address you entered during registration in the email body. The ENTSO-E Helpdesk will make their best efforts to respond to your request within 3 working days.
5. They will normally respond next working day, I guess 3 days is to be on the safe side.

When you receive answer from them, there will be a button on your "My account settings" page. Click it to generate API token.

Voilá!