You might also look into their average pay program. I hope they still have it. Basically if you've lived at the same address for a year they will average out your payments and you pay the same amount each month. The catch is at the end if you are over the estimate you will have to pay that. When I was on it I would look at my bill each month as in spring and fall I typically paid for more than I used but hot summers and cold winters balanced out my usage.