Project Sunroof has checked the viability of 60 million US rooftops. A five kilowatt rooftop solar installation now costs just $12,500 on average after tax credits, and pretty soon, installing one might soon be a matter of re-tiling your roof.
https://www.engadget.com/2017/03/15/google-4-out-of-5-us-homes-have-solar-power-potential/
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