If she's not paying for the electricity I wouldn't let her use it, take her lightbulbs away, screw covers on all the outlets except for the ones in your room that you keep locked, put a lock on the fridge after removing any food of hers, etc. Though she would probably do something in return as revenge.

Kick her out

Cut off electronics and charge your essentials at coffee-shops etc. When she asks, say that the bill can't be paid since you don't have the money and she will not pay. I mean, you are roommates so you have to see her at some point.

im pretty sure the roommate is right you are a bitch

How'd he set it up that fast? Unless you mean he continued setting up his new toy.

Shouldn't that have been discussed before she moved in?

Can you turn off the electrical breakers when you leave the apartment?