Fuel encompasses materials reacting with other substances to release energy, either as thermal energy or for work. Initially, the term applied only to materials releasing chemical energy. However, its definition has broadened to include other heat energy sources, like nuclear energy. Thus, the scope of 'fuel' extends beyond traditional chemical combustion to encompass any substance or process capable of generating usable energy.
2005: Coal Provides 40% of World's Electrical Power
In 2005, coal combustion was responsible for generating 40% of the world's electrical power.
2006: Non-Fossil Energy Sources in 2006
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%).
2007: Energy Information Administration Estimates for 2007
In 2007, the Energy Information Administration estimated that primary sources of energy consisted of petroleum (36.0%), coal (27.4%), and natural gas (23.0%), making up 86.4% of fossil fuels in primary energy consumption worldwide.
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