The thesis focuses on the transition to green technology using renewable energy sources in the Coastal– Karst region. Our aim is to find suitable areas for the establishment of solar power plants. The analysis focuses on spatial and legal constraints and is based on the intensity of solar irradiance and environmental criteria. All data used are freely accessible and are combined with ArcMap cartographic models. The analysis also includes changes in legislation, such as Act on the Promotion of the Use of Renewable Energy Sources. The analysis specifically addresses large buildings, agricultural land in afforestation, permanent grassland, and brownfield land. Improvements are proposed to provide a more detailed analysis on municipalities and to upgrade the analysis of traffic routes. As a result, 21.5% of land in the Coastal–Karst region is suitable for the establishment of solar power plants.