After spending so much time and energy with energy companies, I figure I should pass this info onto the internet world (within Houston). I am a Centerpoint Energy resident (you don't get to choose the electricity provider you have; it's based on where the electricity is provided). I think Houston is predominantly a Centerpoint energy area (correct me if I'm wrong).
Ready to shop? Below you’ll find available electricity rates in Houston. Search for plans by rate, term length or brand. If you have an apartment with a short lease, a supply plan with a shorter length might be the best for you. However, if you own a home and don’t plan on moving for a while, you can look for long-term plans. You have the power to choose!
Energy Choice Experts: This company provides an apples-to-apples cost comparison of all 12 month plans based upon a client's usage history and guarantees they will find the Lowest Annual Cost plan for each client based upon their usage pattern. New clients pay a flat $35. Returning clients pay $30. You sign up the for electricity service yourself. They only provide the analysis (the hard part). More info
On the other hand, month-to-month variable rate (no-contract) plans don’t have cancellation fees. You won’t be penalized if you find a better deal elsewhere and want to make another switch.  And, you won’t be stuck paying more than you should be if the market rate for electricity trends down.  But, if it goes up, you’ll be paying more than your in-contract neighbors, and you’ll likely want to shop around again for a better deal.