Where was Ani rude at all?
Anyway, I don't think you are able to get the owner of the aura without triggering the whole thing (good luck in gui).
I assume you're trying to create a pylon type power thing (if wrong, ignore but ideally actually state what you're trying to do when you post a problem). Instead of changing owners when a building gets unpowered I would just disable/pause it. That way don't have to figure out who owns the power aura, you just have to re-enable/unpause.