Yes, since efficiency is the other (oft neglected) half of the sustainable energy equation. A better average measure is the cost per unit of work performed, ra

Yes, since efficiency is the other (oft neglected) half of the sustainable energy equation. A better average measure is the cost per unit of work performed, rather than the cost of the energy input. For example, higher energy prices might make me buy a more efficient refrigerator, meaning the end result, keeping my food cold, still costs about the same.