Left to right: CertainTeed’s EnerGen photovoltaic roofing system, Dow’s Powerhouse Solar Shingles and Washington Supply’s photovoltaic system are all harnessing the power of solar energy.  
Left to right: CertainTeed’s EnerGen photovoltaic roofing system, Dow’s Powerhouse Solar Shingles and Washington Supply’s photovoltaic system are all harnessing the power of solar energy.  
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