In Germany, redispatch measures for the eliminations of bottlenecks within the transmission grid are currently limited to conventional power generation plants. An amendment to the German Energy Industry Act with effect from 1 October 2021 allows renewable-energy facilities to be deployed for redispatch measures. These new regulations will strengthen the role of renewables in the maintenance of electricity system security. The task now is to ensure balance sheet handling for such redispatch measures and to develop a mode for the financial settlement of the interventions.
For this reason, TSCNET shareholder 50Hertz, the transmission system operator (TSO) from north-east Germany, has entered into an agreement with the Norwegian energy company Statkraft, Europe’s largest producer of renewable energy, to jointly test redispatch with renewable energy systems in practice. The key objective of these practical tests is being able to calculate the necessary effort for redispatch measures with renewable energy systems. 50Hertz accesses wind farms marketed by Statkraft in Brandenburg and Mecklenburg-Western Pomerania that are directly connected to the TSO’s transmission grid or to a regional distribution grid. 50Hertz and Statkraft want to test demand variants for the wind farms to allow the legal requirements to be implemented efficiently and safely with this new form of redispatch.
Dr Dirk Biermann, Managing Director Markets and Systems Operation at 50Hertz, explains that due to the new legal regulations, TSOs will in future have various options for the demand of redispatch for plants in the distribution grid. Dr Biermann comments on the forthcoming practice tests: “Demand via the distribution system operator is just as possible as direct demand by 50Hertz. Our aim is to identify the most efficient way. We hope that the field test will provide us with important insights in this regard.”