The generation of electricity and heat according to demand is an important component of the energy transition. In the Flex KWK project, Fraunhofer UMSICHT demonstrates a new combined heat and power generation (CHP) concept. The operation of a combined heat and power plant is flexibly adapted to the demand for electricity. At the same time, heat storage devices and a power-to-heat system ensure that the heat demand of the heat sink can be met at any time. Following the successful integration of a Flex KWK plant into a local heating island in Oberhausen, Fraunhofer UMSICHT identifies further promising locations and favorable framework conditions.