Serbia is heavily dependent on foreign sources of natural gas, with only 17% coming from domestic production (totalling 491 million cubic meters 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 comprise 3,177 kilometers of trunk and regional natural gas pipelines and a 450 million cubic meter underground gas storage facility at Banatski Dvor.