Etile integrates a thin photovoltaic panel in a steel roof shingle. The modular roofing element is appealing to the eye as it can be positioned in a rectangular or diagonal pattern, giving it special visual impact. The user-friendly panel can be installed on many types of buildings, something that is especially advantageous to homeowners. Furthermore, the combination of two functions within a single two-in-one panel reduces the purchase and installation costs for a photovoltaic system.