Sustainable energy supply systems are based on renewable energy sources. Of course the availability of the space required for producing renewable heat and electricity is essential. Currently diverse ways of utilizing the available land area are competing, and using building surfaces could alleviate such competition. Moreover using building components and building surfaces respectively for energy production, energy storage as well as for energy distribution and supply with fresh air could generate synergies in respect to classical functions of building surfaces like aesthetics, weather and heat protection or noise insulation. Because of such multiple integrated functions, reduction of distribution losses as well as high prefabrication potential considerable economic benefits are expected with regard to the life cycle of new built as well as refurbished multi-storey buildings. In respect to refurbishing the existing building stock prefabricated facades are especially advantageous considering short installation time and little strain on the residents compared to conventional refurbishment procedures. Therefore prefabricated facades have a huge potential to increase the overall rate of refurbishment.