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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.
conventional energy resources the word conventional is defined as not unusual or extreme ordinary this fits well with conventional energy sources in terms of being not unusual conventional energy sources have demonstrated both positive and negative consequences