CITIES Innovation Center conducts projects on smart-building solutions related to the integration of energy systems. Smart buildings will in the future not only be sensitive to the actual conditions such as weather and the presence of occupants, they will also reflect on the connecting energy and water grids or price signals. This way smart buildings will be one of the many components that enable the city systems to optimize and enable a large share of renewable energy. To enable buildings to interact optimally with the surroundings, data must be interexchange and IT systems have to compute relevant control settings in real-time and communicate to the control system of the buildings.