Earlier quoted context omitted.
winter storms and strong winds. i've never lost power in the boulder area, except when a substation failed, regardless of the weather. when i lived in areas with overhead lines, power loss was a regular event, occurring during winds that would be considered mild in boulder.
Regularly trimming trees around the power line seems less expensive than boring through granite? The frequency of storm-related outages is a good proxy for how much the power company is spending on vegetation removal.
That's not going to do anything to stop ice from forming on the lines, which is a far bigger problem in the winter than tree falls.