Single adjective meaning "does not use much energy"


Is there a single adjective that means "does not use much energy" / "not using much energy"?


I do not mean "efficient".


Efficient means something that does not waste much energy - something efficient could use a lot of energy for a specific purpose, yet not waste much energy on actions that do not achieve that purpose/not waste energy as heat or sound or whatever.


However, something *word I seek* may or may not be efficient, i.e may waste very little, or very much energy, in trying to perform a task, but does not/will not use or consume much energy in trying to perform the task - whether some of this energy is wasted or not.




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