Fossil-based traditional energy sources have significant disadvantages based on environmental, economic and social problems. These disadvantages enable societies to turn to renewable energy sources (solar, wind, hydro, tidal, biomass, geothermal) against fossil energy sources. Technological developments and increasing economic benefits allow solar energy systems to become widespread and stand out. Making the right site selection decision is of great importance in the installation of grid-connected photovoltaic power plants, which require high initial costs. In the study, comparison and evaluation of alternative sites are made by fuzzy AHP and TOPSIS methods according to the main and sub-criteria defined by the literature review. The order of importance according to the criteria weights ensures the determination of the priority criteria that should be considered in the selection of the site. Sensitivity analyzes provide information on the effects of criteria in site selection evaluation.