In architecture, fenestration refers to the openings in a building: the windows, doors, skylights and anything related. The idea of getting solar power from windows makes a lot of sense. We put up blinds and curtains because the sun can be too strong and too warm. Right there on almost every building is a source for solar energy, free and not requiring blocky equipment.

These sensitive photovoltaics can draw power from lunar energy and artificial lights in addition to the sun’s rays. Their relatively low price per unit reinforces the sensibility of simply putting them on all sides of a structure, including those with less natural light.

Source: Future of Fenestration: Every Window Will Generate Solar Power | Urbanist