The reduction of conventional thermal generation has far-reaching consequences for system operations. Currently, the question is whether the basic system behavior, which is based on the electromechanical properties of the synchronous machine, can and should be maintained in the long term. This debate needs to be accompanied by science both for the intermediate period of the energy transition (until around 2035) as well as for the completed transition (by around 2045). New system dynamics must also be taken into account in the future, such as those caused by sector coupling systems with the gas network or by increasing power electronics in the power grid itself.