build up 3dA settlement consisting of pre-fabricated houses in Wuppertal Germany is a living lab for future energy concepts of city quarters. The 19 modern and fully equipped exhibition houses are all efficiency plus houses (energy plus houses) according to the definition of the German Building Ministry, e.g. they generate more renewable energy than the total energy use of the houses if balanced over a year. Each house features an electrical heat pump, a photovoltaic (PV) field on the roof and partly the facades and electrical storages (batteries). Additionally they are connected to each other via an internal electricity grid. The Fraunhofer Institute for Building Physics is monitoring the energy generated, used and taken from the national grid. A first result is that the houses have saved about 30,000 kWh electricity (15% of the electricity use) between February 2016 and May 2017 due to the electricity exchange via the internal grid. As next step of the living lab a central electrical storage will be added to the internal grid in order to further reduce the electricity taken from the national grid. Read More