The transition to renewable energies and persistent bottlenecks in the German transmission grid represent key challenges for the German electricity supply system in terms of the need for security of supply. A so-called capacity mechanism could be an important solution to this. On behalf of the four German transmission system operators (TSOs) Amprion GmbH, TenneT TSO GmbH, 50Hertz Transmission GmbH and TransnetBW GmbH, the foundations of a capacity mechanism for the German electricity market that is compatible with the European legal framework for the energy market and European state aid law are therefore to be developed. In an interdisciplinary research team led by Consentec, the Ecologic Institute is responsible for examining energy law issues in the project.