Solar photovoltaic (solar PV) electricity has recently become the lowest cost source of electricity in most parts of the world. Solar PV supports a socially just and acceptable energy transition and integrated applications, as well as new business opportunities. This report is focusing on one of these new business opportunities. It aims at describing the added value of Building Integrated Photovoltaics (BIPV) for a successful energy transition in European cities, as well as the related opportunities for EU businesses. It describes the regulatory and market framework needed for sustainable business models for BIPV, that are adapted to city planning constraints and specificities.