Solar energy as cheap as grid-supplied electricity could be just a few years away, at least for large commercial facilities with flat rooftops or some acreage to spare. Six years ago the Department of Energy awarded a $42 million grant to a company called
Nanosolar for the development of large-scale rooftop photovoltaic systems that cost no more per watt than conventional electricity, and earlier this month DOE certified that so far the company has passed its milestones on the way to achieving a 2015 deadline.
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