One of the biggest problems in the world today is the issue of energy. There is a complex two-way relationship between energy and climate change. Stopping climate change is a strategic opportunity to develop and invest in modern infrastructure as well as an opportunity for an integrated approach to smart city development and planning. Renewable energy sources and modern technologies are becoming an increasingly important segment in all fields because they reduce overall energy consumption and have a positive impact on the environment. Approaching from the point of view of problem-solving possibilities, the idea was to conduct research in the direction of identifying relevant factors for the application of renewable energy sources and improving the efficiency of their end use. By exploring these opportunities through projects, adequate access to energy, global warming and environmental management should be provided. A prerequisite for such a process is a thorough understanding of complex systems, using multi-criteria analysis, which allows decision makers to find a balance between the technical and economic possibilities of today's and long-term development perspectives.