Our regional electric company had to have spent over a million dollars on a multi-year project to trim all the trees near our power lines. They used an outside contractor and asked all property owners to sign waivers if their 'aggressive' trimming caused permanent damage. This was to mitigate power outages when the wind blew limbs into the line.
We still have a lot of short term power losses. When the linemen are out for repairs I'll simply ask, "squirrel"? His answer, "Yep".