Largest surplus energy house in Europe is being built in Freiburg

By 2022, another new administrative building will be erected next to the first.

By the end of 2016, Freiburg will have erected the first building of its new administration complex. The new building with a gross surface area of 24,000 square metres will offer modern workplaces to over 800 employees and provide the residents of Freiburg with a central location where all of the citizens’ services can be found. When it comes to sustainability, too, the project is playing a pioneering role. The new administrative centre should produce more electricity than it needs itself. The engineering experts from Drees & Sommer are planning the energy concept for the building, the building services, the structural physics and the façade technology.

The design for the new building in the district of Stühlinger comes from the architect Christoph Ingenhoven. The costs for the first of three building stages run to EUR 78 million. To ensure a supply of sustainable energy, various technologies are being used in the administrative centre: the building shell is designed to the passive house standard, the roof and façade are equipped with photovoltaic systems, and heating and cooling are provided by ground water. Thanks to the intelligent energy concept, the building produces more electricity than it uses itself, and the surplus is fed into the city’s power grid. As a result, the City of Freiburg can expect lower energy costs in future and is simultaneously making a contribution to achieving environmental protection and climate targets.

A concept study by Ingenhoven envisages that, in addition to the administrative centre with its three separate buildings, residential buildings will also be built. A children’s day-care centre is also planned for the area. The City decided in favour of the extensive new structure to bring together in one location the numerous bodies providing services to citizens and to make the distances shorter for them. By March 2017, less than two years after construction began, the first employees should be moving into the new building.

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