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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.
It is also a. form where the source, which delivers the energy, is endless. Some. alternative energy-sources are sun-, water- and windenergy. By al these. forms of alternative energy, excisting energy (like water, wind and sun) is. used for the making of electric energy.