Here are my 2 cents about electric companies when shopping around for the best rates. Currently, the average cents/kWh in Houston is 10 cents, after speaking to a very helpful, very informative Green Mountain Energy representative. Although their rates are a little higher than my current rates, they have FANTASTIC customer service (which is almost worth it). The GME rep even recommended that I stick with what I am using now since it's cheaper.
Your most effective weapon, however, is a site like ComparePower (Power to Choose) to locate and compare details from various Houston electricity resellers. In one fell swoop, you will efficiently and quickly locate and classify cheap electricity resellers all on one page, instead of wasting your valuable time searching out available companies and visiting their websites one by one (who even does that any more?).
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.