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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.
Green energy term was coined to separate highly polluting fossil fuels from other less polluting, environmentally friendlier energy options such as renewable energy sources.reen energy definition. Ned Haluzan. The simplest green energy definition would be energy produced from energy sources that are environmentally more friendly (or greener) compared to fossil fuels (coal, oil, and natural gas).