Your lease is key. Please contact a lawyer or the housing court sometimes has advocates available to answer your inquiries. Best bet is to send written notice of his breach of warranty of habitability and interference with your quiet enjoyment of the premises. Withhold rent under the theory of constructive eviction, stay as long as possible, save the money and find a new place. Screw this guy - he sounds like a complete moron who will lose in court if what you say is true and should be arrested for converting your utilities to his use.
Contact an Attorney IMMEDIATELY - bring your lease to that Attorney and have him review it and advise you what your rights are with regard to this situation, that is the only way you will know.
You will have to pay for the Attorney, but it will be worth the cost to *know* where you stand *legally*.
One of the rights a home owner or renter has, is the right to quiet enjoyment.
There are also noise ordinances in towns which pertain to what hours power equipment can be used.
Best of luck!