Due to a variety of negative effects associated with renewable energy sources, extensive studies need to be carried out before their integration into the power system, determining the optimal location, size, and type of generation capacities. This paper presents a techno-economic analysis of the available potential of renewable energy sources, focusing on the transmission system of Montenegro. The maps of the statistical climate indicators of wind and solar energy have been processed concerning the technical, economical, and environmental criteria to perform an accurate estimation of the available potential. After performing the zonal division of the maps of available renewable potential, by employing a multiobjective optimization approach, optimal plant size has been determined for each zone. The obtained results can be used as a starting point for further planning studies.