1) Do NOT simply not pay your landlord--if you do so, you will be in breach of your lease, and could be sued and/or evicted.2) However, the landlord has no right to charge you for his electricity (unless, that is, the lease says he can--e.g. you agreed to pay all electrical charges, including landlord's). You should speak with an attorney, because you may be able to sue the landlord to recoup the additional charges. You'd need to provide evidence of the power theft, as well as evidence of what your bills or charges should have been in the absence of the theft of electricity from you. It could be a large amount, and would be worthwhile speaking with a lawyer about. Good luck.