The reduction of CO2 emissions is one of the most urgent challenges of our times. It is an elementary factor when it comes to leading the energy transition to sustainable success. In this context, the optimal use of different energy sources plays as much a role as the sophisticated coordination of energy provision and energy consumption on site. The Fraunhofer-Gesellschaft is making great strides in the development of an open, secure, and scalable system solution, with the ideal solution being fully integrated and automated sector coupling. For this purpose, it has founded the association “Open District Hub e.V.” together with renowned business partners. Fraunhofer IESE from Kaiserslautern is also on board.