A Paragraph to Ponder

From a special report in the Economist (January 17th, 2014) - Invisible Fuel: Energy Efficiency:

"The "fifth fuel", as energy efficiency is sometimes called, is the cheapest of all.  A report by ACEER, an American energy-efficiency group, reckons that the average cost of savings a kilowatt hour is 2.8 cents; the typical retail cost of one in America is 10 cents.  In the electricity-using sector, saving a kilowatt hour can cost as little as one-sixth of a cent, says Mr. Lovins of Rocky Mountain Institute, so payback can be measured in months, not years,"