Solar chimney seems like a good idea
" It works using the solar chimney to cover a large greenhouse which covers several square miles. As the hot air rises, it would escape up a 990m tower in the centre of the structure. Wind turbo-generators mounted in the chimney would convert this 50km-an-hour rush of hot air into electricity."
California’s getting one.
http://alt-e.blogspot.com/2004/11/solar-chimney-for-california.html
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