In 2023, energy efficient district heating (DH) systems, i.e. systems that meet one of the criteria defined in Article 50 of the Act on Energy Efficiency, produced 87,7% of all heat in DO systems, which is the highest value in the observed period. The total share of heat from renewable energy sources (RES) and waste heat amounted to 21,2% in 2023. It increased by 0.5 percentage points compared to the previous year, and by 5.5 percentage points compared to 2016. The indicative annual value from the NEPN 2020 was achieved, but not from the NEPN 2024.The structure of fuel consumption continues to be dominated by fossil fuels, which in 2023 represented as much as 77% of all fuels in DH systems. Despite the fact that a large part of the heat is produced in energy efficient DH systems, greenhouse gas (GHG) emissions from these systems are high and their reduction can only be achieved by replacing old coal units and gradually replacing fossil fuels with RES.