Its your house correct? you could be a pain in the ass to them. I can think of many ways to be a pain in their ass if you own the house and have some imigination. Is their power legal? gas legal? I would think even if it were in their name you could get it shut down as it is your house. Most likely they hacked the electric box or ran a power line to the pole. DTE should have no problem shutting power off in your own house but make sure they come out to turn it off and put a new lock on the box.