If a bear wants in, the bars won't stop/slow him either.I like that idea and have thought about it! My only issue is that I move the coops and fencing too often and don't think I would keep up with adjusting the electric in addition to all the other tasks. That's definitely a good option though and probably the best bet to keep them away!
I think you could wire just the coop so that you can have just one connection to plug/unplug. If you have a solar charger or battery charger on the coop, you wouldn't have to move any connections for each move. Some bee keeping info sources discuss bear fencing on a such a small scale.