There are 20,000 miles of powerline here in Quebec alone, not including the rest of Canada. That's just the 735 KV AC lines and one 450 KV DC line. Flying beside, on top or underneath a powerline is part of our everyday work. Most of the time being underneath the line (conductors) is the only place where you can land, work and park.
In my 36 years of flying and a lot of them working the lines I have never heard of a Helicopter being zapped by or electricity jumping from the conductors to a helicopter no matter what the weather was.
Bell 205 moving repair crews around the job.
JD