There is little question that the roof-mounted photovoltaic (PV)
industry is growing rapidly. According to the Solar Energy
Industries Association (SEIA), the U.S. solar market grew from $3.6
billion in 2009 to $6 billion in 2010. During this same period,
national weighted-average PV system pricing fell 20.5 percent from
$6.45 per watt to $5.13 per watt. In contrast to U.S. gross
national product growth of only 2.8 percent, the U.S. solar market
grew 67 percent in 2010.
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