Quoted:
If they offer "budget billing" you might want to check into it.
Your bill is the same every month based on an average.
Once a year you either make up any actual difference of get a check for any overage.
I had that option on electric and chose not to. The reason being I am just as capable of putting $185 into an ING Direct account every month and withdrawing the actual amount owed. I also get to keep my money and earn a little interest.
Last year we had a blizzard and they didn't come read the meters in Jan so my bill was < $100 (should have been $200ish). Come Feb they read them and my bill was $300. I didn't care as I had put the money aside, however, a friend of mine didn't and got a nice $600 bill because he didn't think enough to realize that his last bill was way lower than it should have been.
I use ING Direct for most of my budgeting these days as I can create an unlimited number of accounts for different ongoing/short term expenses and have the money in my hands until it has to go out.