Rooftop Photovoltaic Guide (43) Detached House with 817% Energy Self-Sufficiency
Release Time:
2025-06-29
Rooftop Photovoltaic Guide (43) Detached House with 817% Energy Self-Sufficiency
Project Name: Brunner-Bapst House
Location: Waltensburg, Switzerland
Photovoltaic System Grid Connection Date: December 13, 2019
Design Firm: Bearth & Deplazes Architekten AG
In 2019, the Brunner-Bapst farming family in Switzerland boldly chose a fully covered photovoltaic roof for their new home. A 48.36 kWp photovoltaic system was installed on the 270.4 m² east-west facing double-pitched roof, capable of generating 40,154 kWh annually.
With excellent building insulation, LED lighting, and the use of A+++ energy-efficient appliances, the house's annual energy demand is only 4,915 kWh, resulting in an energy self-sufficiency rate of 817%, setting a world record at the time.
The total investment in the rooftop photovoltaic system was 50,000 Swiss francs. Due to savings on traditional roofing materials and construction costs, the total cost of the house did not increase. The owners expect to recoup the entire investment in the photovoltaic system within 10 years by selling excess electricity.
This building was one of the two award-winning buildings of the 2020 Norman • Foster Solar Energy Award. Lord Norman Foster commented: • "The Brunner-Bapst house is not only extremely impressive in terms of solar energy performance, but its craftsmanship is also superb, with a simple and elegant appearance—this perfect combination makes it a worthy winner of the Solar Energy Award."
Source: Eurac, Solargentur
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