ALCALA 33 · MADRID, SPAIN
Onyx Solar has provided innovative photovoltaic glass for the main skylight in the rehabilitation of the historic building located at 33 Alcalá Street in Madrid. Originally constructed in 1900, this iconic building is part of the Villa de Madrid Historic Complex, an area with archaeological protection, making the renovation both a technical and aesthetic challenge.
The installation consists of 12 amorphous silicon photovoltaic glass units, each with a high degree of transparency to maximize the entry of natural light. Each glass panels measures 2,438x1,160 mm and incorporates an air chamber to further enhance thermal insulation. The skylight not only generates clean energy but also improves the building’s insulation while filtering harmful UV rays, contributing to the overall energy efficiency of the structure.
This building, which was declared in ruins in 2005, is being restored to serve as the new headquarters for Reny Picot, an international dairy industry leader. The restoration, designed by Díaz & Díaz Architects, focuses on preserving the building’s historical elements, such as the exterior façade, staircase, and portal, while integrating modern features. At the heart of the design is a stunning central staircase, illuminated by the photovoltaic skylight, and connected by glass walkways and a panoramic elevator.
The choice of photovoltaic glass perfectly aligns with the project’s goal of blending historical preservation with modern sustainability. By incorporating photovoltaic glass, the building now benefits from clean, renewable energy while maintaining its aesthetic integrity. The energy generated by the skylight helps reduce the building’s reliance on external power sources, while the thermal insulation provided by the air chamber contributes to improved energy efficiency, especially important for maintaining stable indoor temperatures throughout the year. Furthermore, the high transparency of the glass allows natural light to flood the interior, enhancing the ambiance of the renovated spaces.
