Definitions of alternative energy
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energy derived from sources that do not use up natural resources or harm the environment
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types:
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solar energy, solar power
energy from the sun that is converted into thermal or electrical energy
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wind generation, wind power
power derived from the wind (as by windmills)
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type of:
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energy, free energy
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
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solar energy, solar power
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