"It's a very easy thing to say, 'Go get a backup quarterback.' Now tell me where to get them. You just can't dial them up."

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Variable but forecastable renewables (wind and solar cells) are very reliable when integrated with each other, existing supplies and demand. For example, three German states were more than 30 percent wind-powered in 2007 - and more than 100 percent in some months. Mostly renewable power generally needs less backup than utilities already bought to combat big coal and nuclear plants' intermittence.

— Amory Lovins