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Utility Solar Now <$1/W

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I don't know how transferable utility is to residential for costs.

It pretty hard to get a worse work safety/ insurance situation than residential roof top work.

"Falls are the leading cause of death in the construction industry, accounting for over 3,500 fatalities between 2003 and 2013. Falls from roofs accounted for nearly 1,200, or34%, of the fall deaths during that period"
https://www.osha.gov/Publications/OSHA3755.pdf

This safety issue profoundly affects productivity, and therefore cost.