in the world (second in Europe, after Germany). Coal is found in two large deposits: Kolubara (4 billion tonnes of reserves) and Kostolac (1.5 billion tonnes). Despite being small on a world scale, Serbia's oil and gas resources (77.4 million tonnes of oil equivalent and 48.1 billion cubic metres, respectively) have a certain regional importance since they are largest in the region of former Yugoslavia as well as the Balkans (excluding Romania). Almost 90% of the discovered oil and gas are to be found in Banat and those oil and gas fields are by size among the largest in the Pannonian basin but are average on a European scale. The production of electricity in 2015 in Serbia was 36.5 billion kilowatt-hours (KWh), while the final electricity consumption amounted to 35.5 billion kilowatt-hours (KWh). Most of the electricity produced comes from thermal-power plants (72.7% of all electricity) and to a lesser degree from hydroelectric-power plants (27.3%). There are 6 lignite-operated thermal-power plants with an installed power of 3,936 MW; largest of which are 1,502 MW-Nikola Tesla 1 and 1,160 MW-Nikola Tesla 2, both in Obrenovac. Total installed power of 9 hydroelectric-power plants is 2,831 MW, largest of which is Đerdap 1 with capacity of 1,026 MW. In addition to this, there are mazute and gas-operated thermal-power plants with an installed power of 353 MW. The entire production of electricity is concentrated in Elektroprivreda Srbije (EPS), public electric-utility power company. The current oil production in Serbia amounts to over 1.1 million tonnes of oil equivalent and satisfies some 43% of country's needs while the rest is imported. National petrol company, Naftna Industrija Srbije (NIS), was acquired in 2008 by Gazprom Neft. The company's refinery in Pančevo (capacity of 4.8 million tonnes) is one of the most modern oil-refineries in Europe; it also operates network of 334 filling stations in Serbia (74% of domestic market) and additional 36 stations in Bosnia and Herzegovina, 31 in Bulgaria, and 28 in Romania. There are 155 kilometres of crude oil pipelines connecting Pančevo and Novi Sad refineries as a part of trans-national Adria oil pipeline. Serbia is heavily dependent on foreign sources of natural gas, with only 17% coming from domestic production (totalling 491 million cubic metres in 2012) and the rest is imported, mainly from Russia (via gas pipelines that run through Ukraine and Hungary). Srbijagas, public company, operates the natural gas transportation system which