Okay. It's kind of a regional thing. Your best bet is to go to www.energyswitchma.gov and see what's cheapest in your zip code. I think all the companies make you sign up for a contract, could be anywhere from 1-3 years. The difference is some charge a cancellation fee and some auto-renew when your time is up. Be careful because there are companies that offer a low introductory rate to get you into a contract but in the fine print you'll see that the price goes way up after a few months, these offers usually come in the mail. If your area has a "municipal aggregation program" that will be your best bet. It's a local collective that negotiates with the companies for better rates. If there's one in your area it'll come up on that website.