Energy mix

The energy mix is a group of different primary energy sources from which secondary energy for direct use - such as electricity - is produced. Energy mix refers to all direct uses of energy, such as transportation and housing, and should not be confused with power generation mix, which refers only to generation of electricity. In 2007, the global primary energy use was oil equivalent, or . According to the International Energy Agency (IEA) 13.6% of world primary energy was used by the European Union (EU). Within the EU, 75.9% came from fossil fuels, 14.1% from nuclear power, 7% from biofuels, 2.9 from renewable energy resources. Overall primary energy consumption in the United States in 2015 relied most on petroleum (), natural gas () and coal (). Renewables contributed and nuclear power . In the same year, about 4 million GWh of electricity were generated in the United States, 67% of which was generated from fossil fuels (coal, natural gas, and