The installed cost of solar photovoltaic (PV) power systems in the United States fell substantially in 2010 and into the first half of 2011, according to the latest edition of an annual PV cost tracking report released by the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab).
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/12998/Default.aspx]
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