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.

According to the data for 2023, GHG emissions per unit of electricity produced amounted to 166 gCO₂/kWh. In the period 1992–2023, the intensity of GHG emissions decreased by 62,4%. Compared to the EU-27 average, intensity of GHG emissions in Slovenia in 2023 was 19,8% lower.

In 2023, 65% of the population was connected to municipal wastewater treatment systems with secondary or tertiary treatment, which do not produce GHG emissions. Compared to the previous year, the share increased slightly, and compared to 2017, it rose by 3.5 percentage points.

In 2023, the share of RES in transport, after a significant drop in 2022, increased again and amounted to 10%. With this, it was 0.7 percentage points behind the non-binding 2023 target from the National Energy and Climate Plan (NECP).

From 2012 to 2023, the installed capacity of the systems for the production of electricity from RES has increased by 78,5%. Almost two-thirds of that increase, 51,2%, was achieved in the last four years. The indicator is currently on a trajectory of achieving the indicative targets until 2030 set in the National Energy and Climate Plan (NECP).