Check the heating/gas portion. If you have baseboard heating, the bill will skyrocket. Also, check to make sure that you don't have another company/carrier on your bill. Your energy supplier and carrier should be PSE&G. If there's any other name on the bill like a company you never heard of, someone switched your supplier.

There are companies that go door to door, or make calls to residents asking them to switch their service. They make it seem like they are from PSEG and trick customers into signing onto another energy carrier. These carriers can charge whatever they want per kilowat hour, and folks don't realize until they have been switched over.