Romania is a net exporter of electrical energy and is 52nd worldwide in terms of consumption of electric energy. Around a third of the produced energy comes from renewable sources, mostly as hydroelectric power. In 2015, the main sources were coal (28%), hydroelectric (30%), nuclear (18%), and hydrocarbons (14%). It has one of the largest refining capacities in Eastern Europe, even though oil and natural gas production has been decreasing for more than a decade. With one of the largest reserves of crude oil and shale gas in Europe it is among the most energy-independent countries in the European Union, and is looking to expand its nuclear power plant at Cernavodă further.