One third of the production of electric energy for energetical network in Slovakia is realized by the production in classic thermal power stations, mostly brown coal is combusted. New laws and international agreements aim at the decrease of injurants in air included also into the programme of Slovak energetics. After the year 1995 the share of production of electric energy in Slovakia from atomic power stations ought to be 67 %, from hydro-electric power plants 15 % and from fossile fuels 18 %.