From the analysis of the onshore territory aimed at finding the most optimal location for the implementation of a hybrid energy source based on wind and solar power, we identified zones in the vicinity of run-of-river hydropower plants. The proposed solution is economically advantageous for the deployment of wind turbines on land in combination with other power sources. By comparing various scenarios and calculating the Net Present Value (NPV), we identified significant infrastructural benefits from installing hybrid wind and solar sources near existing hydropower plants. CAPEX was determined based on the simulation of the real placement of sources, considering all ecological and operational aspects. The case study is based on wind turbines of SIEMENS Gamesa SG type and monocrystalline solar panels, with power output complementary to existing hydropower plant and infrastructure. Also crucial is the comparison of the resulting power production profile of the hydroelectric plant with the production profile of the hybrid system. The possibility of use hydropower plant operational modes for accumulation of energy is discussed and compared to BESS solution.