Market Master Data Register
Official register of the Federal Network Agency where all electricity generating systems in Germany must be registered.
Also known as: MaStR, Marktstammdatenregister
What Is the Market Master Data Register?
The Market Master Data Register (MaStR) is a public register of the Federal Network Agency (BNetzA) where all electricity and gas generating systems as well as storage systems in Germany are recorded. Registration is legally required and a prerequisite for receiving the feed-in tariff.
Registration Requirement
The following systems must be registered:
- All PV systems — regardless of size
- Balcony solar systems (plug-in solar devices)
- Battery storage systems
- Wind, biogas, and hydropower systems
Registration must be completed within one month of commissioning.
Registration Process
- Create an account at marktstammdatenregister.de
- Enter location and operator details
- Specify system type, capacity, and commissioning date
- Confirm grid operator assignment
- Receive MaStR number
Consequences of Non-Registration
| Consequence | Details |
|---|---|
| Loss of feed-in tariff | No entitlement to EEG remuneration |
| Fine | Up to EUR 50,000 possible |
| Late registration | Possible at any time, remuneration only from registration date |
Practical Tip
Registration is free and takes about 15—30 minutes. Since 2024, a simplified procedure is available for balcony solar systems — only a few details are needed. Ask the installer whether they will handle the registration.
Related Terms
Grid Operator
Company that operates the local electricity grid and is responsible for grid connection and feed-in tariff payments.
EEG (Renewable Energy Sources Act)
German law promoting renewable energies -- governs the feed-in tariff for solar electricity, among other things.
Balcony Solar System
Small plug-in solar device (up to 800 W) mounted on a balcony or facade that feeds electricity directly into the home grid.