28 abril 2015
Researchers have conducted the most comprehensive study yet of the full cost of saving electricity by U.S. utility efficiency programs and now have an answer: 4.6 cents. That’s the average total cost of saving a kilowatt-hour in 20 states from 2009 to 2013.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/kEWNkulJLIg/150428141819.htm
