I am sure it happens. When the tree trimming guys went through a neighborhood, where they had vehemently complained about the outages, (they formed a group, and were trying to get another power company in), It looked like major storm had hit. They took out dead and hollowed trees, 18" overgrown branches. I doubt they will have any issue for 20 years. But it was like 5 cords of wood on the curb per block.