Slovenia has a negligible production of oil and gas and is a net oil importer with most imports coming from Russia. Petrol is the national oil company. Its privatization was completed in 1998 with the sale of the 15.6% still held by the State after the wave of privatization of 1997. Petrol is responsible for the oil supplies and the gas distribution network; it has a majority stake in the refinery of Lendava, and has the most important network of service stations of the country. There are two other companies in the sector, Istrabenz for oil and Petrolzemeljski for gas.

Petrol Ljubljana's principal activity is the sale of oil and oil products. The Company also sells solid fuel, liquefied petroleum gas and natural gas. The Group is involved in the extraction of crude oil, production of electric power, and has 331 service stations in Slovenia and abroad and sold 1.86 million tonnes of oil products in 2003.