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(Environmental Science) a form of energy derived from a natural source, such as the sun, wind, tides, or waves. Also called: renewable energy
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|Noun||1.||alternative energy - energy derived from sources that do not use up natural resources or harm the environment|
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; "energy can take a wide variety of forms"
solar energy, solar power - energy from the sun that is converted into thermal or electrical energy; "the amount of energy falling on the earth is given by the solar constant, but very little use has been made of solar energy"