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The Market Master Data Register (MaStR) is the register for the German electricity and gas market and is managed by the Federal Network Agency. In MaStR, the master data for electricity and gas generation plants must be registered. In addition, the master data of market players such as plant operators, grid operators, and energy suppliers must be registered. MaStR is available online not only to the authorities but also to market players and the public. At the same time, various existing registration obligations are to be bundled in the market master data register. Due to the repeated postponement of the opening of the web portal, however, the registration obligations could only be fulfilled insufficiently so far or had to be carried out for EEG plants in the plant register.

On 27 September 2018, the Federal Ministry for Economic Affairs and Energy (BMWi) published a draft bill to amend the Market Master Data Register Regulations (MaStRV). The main (necessary) changes are as follows: Greater protection of personal data with regard to publications concerning smaller installations with an installed capacity of up to 30 kW and adjustment of deadlines for delays in the commissioning of the web portal. Registrations of market players, units, EEG and CHP plants and projects, which have been submitted within the first 24 months after the launch of the web portal, should be officially reported as punctual. In addition to linguistic smoothing, there are some fine adjustments regarding registration obligations.