Comparison of the potential environmental impacts of three different orientations for a rooftop plant located in Catania (South Italy). The results are referred to F.U (1 kWh produced by the PV plant). The categories analyzed are: Climate Change (CC), Ozone Depletion (OD), Photochemical Ozone Formation (POF), Particulate Matter (PM), Acidification (A), Freshwater Eutrophication (FE), Marine Eutrophication (ME), Terrestrial Eutrophication (TE), Land use (LU), Resource Use, Fossil (RU_F), Resource Use, Mineral and Metals (RU_MM) and Cumulative Energy Demand (CED).