Photovoltaic shingles are a form of shingles that function as solar panels. They lay flush with your roof and help protect it from the elements, just like standard shingles. Wires run below the shingles across your roof to batteries or right into your home's electric panels, helping to offset the amount of power your home uses.
http://greenliving.lovetoknow.com/Photovoltaic_Shingles
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