barbara ann, those are evaporative cooling towers and the emissions you see are steam. But, the plant (like many power plants) isn't entirely pollution free. If you want to know more, here's a Wikipedia article that pretty much answers anything you might ask. http://en.wikipedia.org/wiki/JEA_Northside_Generating_Station And, thank you David, Ned, tony, Bertus and barbara ann for your comments.
Idem! and a striking remark; can we love/like to see an image that hides/presents something bad? Riefenstahl.... theory: S.Sontag 'regarding the pain of others'.