** FILE **This file photo from Sept. 20, 2000, shows a wind turbine amidst a field of corn, north of Lincoln, Neb. Nebraska ranks sixth in the nation in terms of the potential for wind energy, according to the American Wind Energy Association. But there aren't nearly as many wind turbines in Nebraska, which is the nation's only all public-power state, as in neighboring states. Nearby states, Iowa and Minnesota, are both among the top five wind energy producing states with California producing the most. (AP Photo/Nati Harnik)