On the way to clean energy in the world and Europe, we have to switch from traditional energy sources to renewable ones. Building sector is the largest energy consumers, accounting for 40% of final energy consumption and 36% of greenhouse gas emissions in Europe. A centralized heating system is proving to be the best solution for heating and hot water preparation, and the goal is to implement renewable energy sources in such systems In the proposed thesis, an analysis of the solar district heating system in Denmark is made, and as an example of such a system, a detailed analysis of the operation of the centralized solar district heating system in the city of Gram. It has been shown that it is possible to store solar energy over the summer and use it in the winter with the help of solar collectors, a seasonal heat storage tank and a heat pump. The second part of the thesis is about the implementation of such a system in Zaprešić. First, an analysis of the current situation was made, followed by a techno-economic analysis of the future centralized solar district heating system using the F-easy tool and the Sunstore 4 Feasibility Evaluation Tool. A comparison of the two scenarios was conducted, and the second scenario was selected as optimal, which includes a solar collector field, a seasonal heat storage, biomass boiler, and a heat pump. Finally, the impact of changes in investment costs and heat prices on the profitability of such a project is shown