The Reichstag building, the chair of the German parliament in Berlin was certified for its energy performance by the Fraunhofer Institute for Building Physics. According to the goals of the EPBD public buildings shall act as leading examples for energy efficiency. The Reichstag is a prime example for energy efficiency of public buildings with a primary energy use of 57 % lower than the requirements for existing buildings and even 39 % than the requirements for new buildings. The total primary energy use for heating, hot water, ventilation, cooling and lighting of the building accumulates to 270,9 kWh/m²a.
The German Ministry for Transport, Building and Urban Affairs contracted Fraunhofer-IBP in cooperation with the Federal Office for Building and Regional Planning and the company Megawatt to issue an energy certificate based on calculations with the standard DIN V 18599. The complex energy supply concept includes combined heat and power units based on biofuel, seasonal heat and cold storages and connects via local district heating and cooling networks several parliamentary buildings. The building was retrofitted between 1991 and 1999 according to the architectural plans of Sir Norman Foster.