I wondered if there had been any house fires caused by solar installations. I found one and it was insignificant. I did not see any other stories.
"[T]he world headquarters of First Solar [...] inhabits a nice building by [Tempe] Town Lake. No solar panels can be seen on or near the building."
https://www.phoenixnewtimes.com/news...y-boom-6456784
From the same article: "Yet there's a common-sense fallacy to the system, if the goal is to produce more solar power overall: residential rooftop installations are less efficient, for the money invested, than large-scale commercial solar plants. The Solar Energy Industries Association reported earlier this year that average residential installations are priced at about $5 to $6 per watt, while utility-scale installations cost under $3 per watt."
It sounds like the same amount of money could pay for great tracts of [unused] land and more solar panels, instead of installing on thousands of unique roofs.