How can I cut my roommates power?

You can flip the breakers...but she can flip them back...

What does your roommate agreement say about utilities?

You can't really do this. You could flip a few breakers, as some people suggest, but unless she's an idiot she'll figure that out pretty quickly and if you keep annoying her then eventually she'll do something as retaliation. You really need to have a nice long talk with her and try to get her working with you, as best you can. Beyond that you can move out when possible but beware of doing anything more - it may come back to bite you some day.

I think the roommate should be evicted.

I assume someone is paying, for electricity, so everyone who lives in the home is going to get electricity.

The landlord, or landlady should be billed, for certain utilities that everyone will use in the home such as electricity, and water, etc. Everyone who lives in the home should pay, for it either before, or once the landlord, or landlady receives his, or her bill.

I assume she is using water, and electricity, so these are utilities that should be included with her rent. In other words it's not a good idea to say utilities are separate in a shared accommodations home. I think whoever says that would be making a mistake.

I suggest the roommate looks, for a new home that does not have utilities. I think this is going to be difficult, or maybe impossible, for her to find if she looks, for shared accommodations. She would have to look, for her own home, so then she can decide what she wants, and does not want to pay, for.

Find another roommate

Give her 30 days notice and tell her if she is not out you will see her in court. No discussions, nothing else.

PS: Yes you can evict a housemate/roommate. You go through the same legal process, give them notice and if they do not abide by it, file in court. In fact, in most states you can file in court right away for non-payment.

You do not have to shut the power off. Simply remove every light bulb from all ceiling fixtures. Unplug all lamps, the television and small appliances, even your window air conditioners and bring them into your room where you have a keyed door knob to keep everything secure in your room while you are away.

Punishment rarely works. Have a talk with her and find out what drives her behavior. Only then, you can take the right action.

Don't cut the power.

Sue for the amount your roommate owes, and get another roommate.

Cut bolt only for her or find another room mate.

Are you ready to be arrested? You cannot legally turn off someone's electricity. You must use the legal system. Sue her in court for the unpaid amount. Bring your documentation to support your claim.

If you do not have legal standing to evict, you can't evict. Roommates generally have no legal standing to evict one another, only the landlord does. If you were there first and the landlord gave you permission to take in sub-tenants, then she is legally your sub-tenant and you may evict after serving notice to pay or vacate. And she is technically not a roommate; the term is used loosely. If both of you rented the place together and utilities are tenat's responsibility, it sounds like you were the one that put the utilities in your name, with an agreement for her to pay you her share. Your ONLY legal remedy to that is to take her to court. If you shut her off, you may find yourself in hot water supplied by the taxpayer.