How is a balcony power plant registered in the market data register

Registering a Balcony Power Plant in the Market Master Data Register – Here's How

If you own a balcony power plant, you must register it in the Market Master Data Register (MaStR) of the Federal Network Agency. Here's a step-by-step guide:

Step 1: Create Access to the Market Master Data Register

To register your balcony power plant, you first need a user account. Register on the Federal Network Agency's website (marktstammdatenregister.de) and select "Natural Person" as the account type if you operate the system privately.

Step 2: Collect Balcony Power Plant Data

Before you start, gather the most important data: module output (in Wp), inverter output (in W), location/address, commissioning date, and the meter number of your electricity meter.

Step 3: Start Registration

After logging in, click on "Registration of a system or a market actor," then on "Registration of a solar system," and select the type "Plug-and-play solar system / balcony power plant." The register will automatically guide you to the simplified form.

Step 4: Provide System Information

Enter the previously collected data: location, commissioning date, module output, inverter output, and meter number.

Step 5: Complete Registration

Complete the registration and download the PDF confirmation and your registration number – this is your proof. Important: An additional registration with the grid operator is no longer necessary since Solar Package I – the grid operator is automatically informed via the MaStR.

Conclusion: Registration in the Market Master Data Register can now be completed in 15–20 minutes, is free, and can be done without an electrician. It must be done within one month of commissioning. A detailed, illustrated guide with all the details can be found in our current guide: Registering a Balcony Power Plant 2026 – Step by Step.