History of Fuel in Timeline

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Fuel

Fuel refers to materials reacting to release energy as thermal energy or work. Initially applied to substances releasing chemical energy, the definition expanded to include other heat energy sources, like nuclear energy.

2005: Coal provides 40% of world's electricity

In 2005, coal was responsible for generating 40% of the world's electrical power supply, marking its significance as a primary energy source.

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2006: Non-fossil energy sources

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%).

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2007: EIA reports on primary energy sources

In 2007, the Energy Information Administration (EIA) estimated that primary energy sources consisted of petroleum (36.0%), coal (27.4%), and natural gas (23.0%), totaling 86.4% for fossil fuels.

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