Wind energy became popular because it can reduce the need for polluting coal and gas generated electricity. But, things are shifting now. “The primary driver is economics,” said Stanley “Skip” Pruss with Five Lakes Energy , a consulting firm on sustainable energy. “Obviously, there are other benefits associated with wind and solar energy. It is environmentally benign. It doesn’t produce any carbon dioxide, no particulates, no acid gases, no heavy metals that contaminate the Great Lakes. So, even