Every year around this time a huge scam takes place in Waterloo. The direct energy resalers (middle men) go out door to door and try to sign up unsuspecting students into fixed rate gas contracts, usually for 5 years. You can spot them a mile away - mid twenties, retard guys, acceptably dressed but still not professional enough to be taken seriously (especially if they were not carrying around the fake clipboard full of official looking crap).
Never ever talk to anyone who comes to your door about your utilities because no one should ever be coming to your door talking to you about your utility bill. They'll be pushy, ask for a bill, and won't take no for answer. They will have an official looking badge for some stupid sounding company "Superior Energy", "Planet Energy", etc. Show them the door.
I just had some stupid kid drop by my place at 10pm asking for my utility bills so he could verify they're all ok. I should have got his name and company before turning him away so I could call and tell them he's useless and was wearing a bandanna.
So beware, and make sure your roommates are aware because - as I've found out - these companies don't play by the rules and will literally take a roommates word for your own.