The use of solar panels on building rooftops is now widespread. In built-up areas, however, incoming sunlight is limited and restricts the deployment of solar power plants. The recent improvements in solar panel efficiency, together with innovative concepts such as Nearly Zero Energy Buildings and Building Integrated PhotoVoltaics, have enabled the exploration of other usable surfaces including highway roofs and walls for potential energy production. Building facades are particularly appealing for producing solar energy during the winter months when the sun is lower in the sky.