I am looking for a free application/tool/plug-in to conduct solar potential/irradiation analysis on a 3D city model. My intention is to know how much solar energy is delivered onto the rooftops and facades of certain buildings. Once I have the information about the solar potential of buildings, I need to overlay this information with various 2D layers in GIS.


I've not used it myself so can't offer any advice on it, but Saga Potential Incoming Solar Radiation might be of help

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