FUEL, ENERGY AND MANUFACTURING
Fuels are dense repositories of energy that are consumed to provide energy services such as heating, transportation and electrical generation. Even though most fuels ultimately get their energy from the sun (see energy conservation) they are usually considered to be a primary energy source. When people talk about energy conservation, usually they mean using less fuel (see fuel conservation). Almost all, about 95%, of human primary energy comes from primary fuels (as opposed to primary energy flows). These fuels go into power plants, see figure 1, engines, heaters and anything else that humans derive work or heat from. This percentage is slightly different for electrical generation; 85% of the primary energy to generate electricity comes from fuels (as opposed to primary energy flows).
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