Here's the German Wind Association (funded the study with Greenpeace) press release.

If these costs were added up and passed on to consumers, the surcharge for conventional energy would be 10.2 cents per kilowatt-hour, nearly 3 times higher than the current surcharge for renewable power, according to the study "Was Strom wirklich kostet" conducted by Green Budget Germany on behalf of power provider Greenpeace Energy and the German Wind Energy Association (BWE).

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin