 The natural gas transportation system comprises of trunk and regional natural gas pipelines, and more than 300 associated structures, connecting production rigs, the Okoli natural gas storage facility, 27 end-users and 37 distribution systems.Croatian production of energy sources covers 85% of nationwide natural gas demand and 19% of oil demand.In 2008, 47.6% of Croatia's primary energy production structure comprised use of natural gas (47.7%), crude oil (18.0%), fuel wood (8.4%), hydro power (25.4%) and other renewable energy sources (0.5%).