Getting the same useful work from less energy through the technical performance of the converting device: a lamp, motor or furnace that wastes less of what it draws. It is distinct from conservation, which changes behaviour rather than equipment, and it is often called the cheapest energy resource because the kilowatthour never consumed needs no plant to generate it.
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Source United States Energy Information Administration Official Site
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1. United States Energy Information Administration Official Site
US Energy Information AdministrationUse of energy explained, Energy efficiency and conservationQuote, Use of energy explained, Energy efficiency and conservation
Installing energy-efficient lights is an efficiency measure, and turning lights off when not needed, either manually or with timers or motion sensor switches, is conservation.
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