Washington Post: Workers atop mountain ridges are putting together 389-foot windmills with massive blades that will turn Appalachian breezes into energy. Retiree David Cowan is fighting to stop them. Because of the bats. Cowan, 72, a longtime caving fanatic who grew to love bats as he slithered through tunnels from Maine to Maui, is asking a federal judge in Maryland to halt construction of the Beech Ridge wind farm. The lawsuit pits Chicago-based Invenergy, a company that produces “green” …