Houston is becoming much greener, and all signs indicate that the city will continue to be a leader in the renewable energy sector. Green energy in Houston is widely available for consumers. Choose Energy has partnered with Amigo Energy and Green Mountain Energy, two trusted green energy suppliers in Houston. The city's energy efficiency rank typically falls within the top ten, and no other municipality buys more renewable energy. Recently, Causes.com rated the city the 10th greenest in the nation.
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
The cheapest rates are going to have shorter contract terms. For instance, a 3 month term is cheaper than a 6 month term and a 6 month term is cheaper than a 12-14 month term. So if you are able to remember to call before your contract expires (they will notify via mail you that your contract is about to expire), then the 3 or 6-month term is your best bet. If you don't call to renew/cancel, you will be charged a much higher variable rate on a month-to-month basis. If this is you, sign for a 12-month contract term with the cheapest rate.
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.