In the production of electricity and heat in thermal power plants and combined heat and power plants 55% of input energy was lost in the year 2010.
Due to a lack of new investments, the efficiency of electricity production and of electricity and heat production is improving too slowly. Compared to the EU-27, Slovenia produced electricity and heat 4 percentage points less efficiently.

Water protection areas represent 17% of the area in Slovenia. Of this 61% is forest, 30% agricultural land, 6% urban land and 3% other surfaces. From agricultural land on the WPA, 49% is grassland, 36% arable land, and permanent crops, agricultural land in afforestation and other agricultural land by 5% each. In the period 2002-2011 have increased the forest areas (1.3%) and urban land (2.3%), and decreased agricultural land (to 1228 ha, or 1.2%).

The main source of environmental (ambient) noise is transport. Road traffic is the most widespread source. Percentage of the population exposed to different noise levels is high. People in urban areas are exposed to the highest levels of noise, because of concentration of population and traffic in the cities. Most worrying is a significant increase in noise at night, because people are most sensitive to noise at that time.

In recent years, cadmium and lead concentrations in the kidneys and livers of roe deer has decreased below the level of toxic concentrations that could have a direct adverse effect on the health of the individuals of this species. Nevertheless, cadmium concentrations in the internal organs of roe deer exceed the admissible concentration determined by law in many areas of Slovenia (taking into consideration the suitability for human consumption).

Acidification of forests represents a potential danger only in the non-hydrocarbon part of Slovenia, especially in the east of the country. According to rough estimates, the critical loads occur particularly in the wider area of both major thermals (Zasavje, Celjska kotlina and Šaleška dolina). Excessive eutrophication of forests for deposition from the air does not take looming forest areas in Slovenia.