I'm one of the pilots doing live power line maintenance. I work for Haverfield Corp which has acquired Ag Rotors. We have 15 aircraft performing live line maintenance, inspections, patrol and now construction. Several other operators are also doing similar work. Check out "Like a Bird on a Wire" on Youtube. Watch old Spider draw an arc from the platform. Its amazing you can somehow get used(?) to being bonded to a kazillion volts all of which are busily trying locate the shortest path to the ground.