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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.
English Collins Dictionary-English Definition & Thesaurus &nbsp. See also: energy band, alternative energy, atomic energy, binding energy. tidal energy. tidal energy. n. renewable energy obtainable on coasts based on the sea or ocean low and high tides. ! get-up-and-go. get-up-and-go.