How would you describe the size of a wind turbine? There's no right answer. Turbines come in different varieties tuned for different uses. Compare the 256-foot-tall Gamesa G87 turbines, found at Bear Creek Wind Park in Penn., with the mini turbines developed by Bergey Windpower in Norman, Okla. The scale of both may surprise you.
filmed and produced by flora lichtman and annette heist