Energy mix

The energy mix is the group of different primary energy sources from which secondary energy for direct use - usually electricity - is produced. Primary energy in the form of fossil fuels is nowadays still mostly used directly for motor-driven vehicles, i.e. transport. Further energy conversion of the co-produced waste heat after burning is not possible.

In 2009, the global primary energy use corresponded to 12.5 million tonnes (12,300,000 long tons; 13,800,000 short tons) oil equivalent corresponding to 145,375 gigawatt-hours (523,350 TJ)). According to the International Energy Agency (IEA) 13,6% of that was used by the EU. Within the EU, 75.9% came from fossil fuels, 14.1% from nuclear energy, 7% from biofuels, 2.9 from renewable energy resources.

Overall primary energy consumption in the U.S. in 2015 relied most on petroleum (35 quadrillion British thermal units (3.7×10¹⁶ kJ)), natural gas (29×10^¹⁵ BTU (3.1×10¹⁶ kJ)) and coal (16×10^¹⁵ BTU (1.7×10¹⁶ kJ)). Renewables contributed 9×10^¹⁵ BTU (9.5×10¹⁵ kJ) and nuclear power 8×10^¹⁵ BTU (8.4×10¹⁵ kJ). In the same year, about 4 million GWh of electricity were generated in the U.S., 67% of which was generated from fossil fuels (coal, natural gas, and < 1% petroleum), 20% from nuclear power, 6% hydropower and 7% other renewables.

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