A financial support programme by the German Federal Ministry of Transport, Building and Urban Development for house builders that erect buildings which generate significantly more energy than the building uses for its operation if balanced over a year. The surplus energy shall be used especially for electromobility. Model projects will be supported partly for using innovative technologies (renewable energies in buildings, e.g. pv, wind, biofacades) and the accompanying research. The ministry has built its own demonstration and research energy surplus house with e-mobility within this framework in Berlin in 2011.