I really like the idea of solar updraft tower, where air moves the other way: http://en.wikipedia.org/wiki/Solar_updraft_tower http://en.wikipedia.org/wiki/Sola

I really like the idea of solar updraft tower, where air moves the other way: http://en.wikipedia.org/wiki/Solar_updraft_tower http://en.wikipedia.org/wiki/Solar_updraft_tower It's disadvantage is that it requires much more land, but it doesn't require water on the other hand. As someone noticed, the water-powered downdraft version requires pumping water from 46 miles away and then 2000+ ft up.