Under CopyrightZimmermann, BrittaBrittaZimmermannKnorr, KasparKasparKnorrSteinke, FlorianFlorianSteinkeWolfrum, PhilippPhilippWolfrumLeveringhaus, ThomasThomasLeveringhaus2022-03-123.9.20152014https://publica.fraunhofer.de/handle/publica/38750210.24406/publica-fhg-387502The research project Kombikraftwerk 2 examined whether and how a reliable and stable electricity supply for Germany with 100% renewable energy sources can be realized in the future. To this end, an assessment of the demand and the provision of ancillary services in such a system with a highshare of wind energy was undertaken. Besides presenting an overview of the results of the project, this paper discusses the role of wind energy in the system in particular.engrid stabilityancillary servicesvoltage controlfrequency controlcontrol reservecongestion managementspinning reserverenewable energyconference paper