Dow has worked out how to make solar panels into rooftop shingles and also to blend them in with a house’s existing roof.  The cost is about forty percent cheaper than the roof top solar tiles reported last year. Because they are built into the conventional shingle design, there’s no real specialized knowledge required to install. That means that weekend warriors and your average roofer can put these up with the same whack of a hammer and tack nails as they do right now.

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