Various environmental policies are created on the basis of scientific knowledge in the sectors of energy, climate and transport. An important role has the Paris Agreement with the aim of limiting the increase in global temperature. The commitments regarding climate neutrality within the framework of "Fit for 55" are important. One of the principles of how to approach the reduction of CO2 emissions within the strategies of countries, regions, cities and municipalities is the use of low-carbon strategies. As part of the study, an analysis of the input data is carried out as part of the assessment of the energy demand and efficiency of public and residential buildings, buildings of the tertiary sector, energy consumption in the public lighting sector, or the use of renewable resources in the city. The aim of the article is to determine the potential of energy savings in individual sectors and propose measures to achieve a reduction in CO2 emissions.