A pumping mechanism, massive amounts of water, abundant sunshine and a 2,250-foot-tall tower could produce 435 megawatt hours a day in electrical output, according to Maryland-based Solar Wind Energy. CEO Ronald Pickett admits the idea has yet to be proven, but he's created computer models showing that it's possible -- and could generate electricity about 33% less expensive than that produced by other renewable-energy technologies. Pickett also notes the concept is closer to possibility because "the construction industry has made great strides in figuring out how to pump concrete and other constructions material that high." However, not all are convinced.

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