This study explores a Geographic Information Systems (GIS)-based approach to assess the photovoltaic (PV) potential of a specific territory, focusing on the municipality of San Severo in the Apulia Region, Italy. The research highlights the growing need for renewable energy sources (RES) in response to climate change and the global energy transition. Using GIS, the study evaluates solar radiation, land use, and technical constraints to identify suitable locations for PV installations, including agrivoltaic systems that integrate agriculture and solar energy production. The methodology combines spatial analysis and environmental data to optimize energy planning while considering landscape and policy constraints. The results demonstrate the effectiveness of GIS tools in supporting sustainable energy development and local decision-making processes. This case study provides a replicable model for assessing solar energy potential in other regions with similar climatic and geographical characteristics.