Even though electricity and heat production increased by 33 % in the 1990-2010 period, CO₂, emissions increased “only” by 3 %, predominantly due to a greater efficiency of production.

In the 1990-2015 period, the quantity of spent nuclear fuel, which is the only type of high-level waste in Slovenia, increased by 5 % annually. As there is still no satisfactory method of waste storage, the accumulation of this waste poses a reason for concern. 

Final energy consumption amounted to 4,440 ktoe in 2020 and decreased for the second year in a row, this time by 9.2%. The reduction was mainly caused by the measures for preventing the spread of SARS-CoV-2 virus. There was a reduction in all sectors except households. In the period 2000‒2020, final energy consumption decreased by 2.2% and in 2020 reached the lowest value in the observed period. Most energy, 36%, is consumed in transport, followed by industry, households and other uses. The 2020 target has been achieved; final energy consumption was 13.2% lower than the target value.

According to the size indicator of energy intensity of final energy consumption Slovenia is in significantly worse place than the average of EU-27. In the last three years, the energy intensity of final energy consumption increased. The only sector by reducing energy intensity in the last three years are households.