The BIPV modules create a semi-transparent surface able to partially shade the upstairs barn. They allow a fair amount of sunlight to penetrate, guaranteeing natural illumination and contributing to the building heating. However, they prevent an excessive solar gain. In this case study, the potential of the BIPV multifunctional technology is highly exploited. All the functions of a traditional roofing system (e.g. mechanical resistance, thermal insulation, protection from atmospheric agents, water tightness, etc.) are connected with the shading function that controls the internal visual and thermal comfort, without compromising the electric energy generation. It is an interesting example of BIPV application on an old construction, which is located in a high-value natural environment.