As far as the generation capabilities of the solar systems, it is important to highlight that to adopt solar technologies, detailed solar suitability information on every building in a community should be available for urban planners (Santos et al., 2011). Identifying buildings that are suitable for solar panel installation requires modeling 1) the built environment, 2) the solar irradiation and, 3) the available area at the rooftops for panels' installation. In the following paragraphs each of these issues is discussed in detail.