The building complex “Silberlaube“ (lit. transl. silver pergola), was built from 1975 to 1979 and functions together with its twin building “Rostlaube” (lit. translation rust pergola) as central auditorium and lecture facility of Freie Universität Berlin. As part of extensive refurbishments of the heating system (in 2003) and insulation of its roof (in 2010), the building’s heat energy consumption in 2015 could be reduced by over 22 per cent based on levels from the year 2000. A 190-kW photovoltaic system on its roof produces 171,000 kWh of solar energy annually. Combined with the PV systems on the roofs of two adjoining buildings (“Rostlaube” and “Mensa II”) 15 per cent of the building complex’ electricity demand can be covered. This equates to the demand of 60 four-person-households.