Keeping the mid-frequency of the grid stable at 50Hz is one of the core tasks of the transmission system operators (TSOs). In cooperation with the Regional Security Coordinators (RSCs), they operate the grid securely and keep it free of congestion. These tasks are becoming increasingly demanding due to the rising share of volatile renewable energies in the grid. Among the renewables, wind energy in quantitative terms plays the decisive role in Germany, and last weekend it was particularly windy – from the German coasts to the Alps – which led to a winter feed-in record for renewables: According to figures based on TSO data and provided by the renowned Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE), on 1 February 2020 renewable energies accounted for 74.8% of net public electricity generation in Germany. Together, the four German TSOs 50Hertz, Amprion, TenneT, and TransnetBW and TSCNET Services mastered the situation very well: The grid was stable at all times.
Fraunhofer ISE continuously publishes German generation and other energy data on the Institute’s Energy Charts website. Theoretically, renewable energies can by now only fully cover power generation in Germany on spring holidays such as Easter or at spring weekends, when power consumption is low and photovoltaics make a larger contribution to generation. The fact that on a winter’s day at the beginning of February renewable energies can already cover almost three-quarters of electricity generation is a good sign that the energy transition in Germany is on track – and the German TSOs and TSCNET Services play an important role in this.