Dow Chemical is expecting sales of about $5 billion a year for its line of Powerhouse solar shingles by 2015, and it is hoping to double that by 2020. Dow intends to sell the photovoltaic systems directly to U.S. homebuilders before making them widely available during 2011. "We're opening up a brand-new market that does not exist today," an official with Dow Solar Solutions said.

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