To what extent are alternative energy sources used with integrated building systems (IBS)? Energy sources first. Renew-ables and nonpolluting sources are in the public eye-even forming the theme of American Mensa's 2005 Annual Colloquium. There are also nonrenewable alternative sources-generators are increasingly associated with individual residences. To the Department of Energy (DOE), though, photovoltaics (PV) are by far the most promising home energy source.
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