If I sign with a marketer will I get two gas bills?

Yes, you will continue to get a bill from the utility for delivery, basic monthly charges, and demand volumes (Rate 25) from the utility. The marketer will bill you separately for the commodity. One thing to bear in mind is that there will no longer be any provincial tax assessed on the bills from the utility company(for those who do not have provincial tax exemption), when purchasing gas through a marketer, increasing your savings.