# Variation of Alternative Fuels

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There are many variations of alternative fuels that can be burned or are consumed to produce heat or energy. They include such things as biomass, ethanol, butanol, methane, and even peanut oil. The other definition would refer to the concept of a fuel that simply liberates the energy without consuming the fuel. These variations of alternative fuels would be such things as stored electricity in batteries or wind and solar power. These alternative fuels are also called sustainable or renewable fuels.

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