Fuel is any substance that releases energy, typically as thermal energy or work, through reaction with other materials. Initially referring to materials releasing chemical energy, the definition has broadened to include other heat energy sources like nuclear energy. The purpose of fuel is to provide a source of power for various applications, ranging from heating to transportation, by harnessing the energy released during its transformation or interaction with other substances.
In 2005, coal was responsible for generating 40% of the world's electrical power supply.
In 2006, non-fossil energy sources included hydroelectric (6.3%), nuclear (8.5%), and other sources such as geothermal, solar, tidal, wind, wood, and waste (0.9%).
In 2007, the Energy Information Administration estimated that primary energy sources consisted of petroleum (36.0%), coal (27.4%), and natural gas (23.0%), totaling 86.4% for fossil fuels in primary energy consumption worldwide.
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