Located above the Bern Bear Park, in a unique setting overlooking the Aare River and the Old Town, stands the Alte Tramdepot—a historic building that now serves as a brewery-restaurant and hotel. After 25 years of operation, the building underwent a comprehensive modernization: In January 2024, the historic building was equipped with a 3S solar roof. The fully integrated photovoltaic system has a total capacity of 54.18 kWp and, with its strong architectural identity, is becoming part of the urban energy transition.
The 3S solar roof is a fully integrated BIPV system designed for full-surface roof coverings. The frameless 3S solar modules are fitted with an exact fit into the roof structure, creating a uniform, seamless surface. Standard black modules were used on the Old Tram Depot, tailored to meet historic preservation requirements and complement the building’s historic roof appearance. The system blends aesthetically into the architecture and demonstrates that photovoltaics can be integrated discreetly even at sensitive locations.
Despite the inner-city location with a steep slope, tram lines in the immediate vicinity, and heavy pedestrian traffic, the project proceeded according to plan. The delivery of the module pallets and the installation on the roof were completed within eleven working days. A total of 283 solar modules were installed: 258 of size L and 25 of size Q. The system supplies approximately 10 percent of the site’s annual power requirement, thereby making a tangible contribution to decarbonization.
This project serves as a prime example of how historically significant buildings can be integrated with modern solar technology without compromising on design. With the 3S solar roof, the Old Tram Depot becomes a gathering place and a visible symbol of the City of Bern’s commitment to sustainability.
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