You don't have a Wisteria tree, you have a Wisteria in a tree. Wisteria are huge heavy vines that will climb anything that comes to hand, including power lines, trees and your house.
At this point, I think the only way you can control it is to cut it down and let it start over. And it will start over. I hate to be the 'party pooper' but you have a problem.
I would get your power company to put their opinion in writing so when the lines do come down, they can't send you they bill.