This diploma thesis describes the hybrid energy supply system for the certain multistory building in the town of Osijek. System consists of renewable energy sources: photovoltaic plant with the possibility of an active cooling of panel, wind turbines and micro hydro-power plant. System is connected to the electricity network of Distribution System Operator. Electricity is used to supply the common facilities of the building and heating energy is used in thermal system for heating water to domestic appliances there. It is presented when there is energy deficit and when there is energy surplus during the day for each month of the year. The problem about surplus and deficit of electricity is partially managed to be solved by installing micro hydropower system. In certain periods of the year electricity has to be provided by Operator network. Finally, the investment costs and revenue analysis are presented as well.