See www.gexa-gouges.com. There have been lots and lots of people gouged by these crooks. Crooks is the nicest word I have for these jerks. Did you know their CFO was one of the top guys at Enron? They learned how to get rich quick from the University of Enron!
What they do is give a competitive short term (6 or 12 month) contract rate. You miss the end of the contract term so they flip you to their "month-to-month" rate - without any notice of any kind. By the time you finally notice, they've hit you with several months that are double your previous rate. When you call, they reccomend a "meter read" that is done by Center Point. That gives them another month at the gouging rate. Then they take their time updating you about the results, so by the time you change to another vendor or plan, you have paid 3, 4, or 5 months at a gouging ripeoff rate.
Check out "Gexa Energy Savings". Let's use easy numbers and the same amount of power each month. Your contract rate was $0.11 per KWH and your normal bill is $220.00 a month for 2000 KWH. Your contract is for 6 or 12 months. Since you have auto pay you miss the date when your contract ends. (You may have assumed you would be contracted or the rate would be similar at contracts end. NOT!)
Since they don't notifiy you in any way, it takes about 3-4 months before you notice the gouge and your power is being billed at $0.21 or more per KWH. So you get 3 bills that are $420, or each about $200 more than the contract rate. So if they gouge for 3 months, that's about $600 extra bucks they gouge you for. If you had a 6 month contract plus 3 months gouge, that is an effective rate of $0.144 for the 9 months.
You just thought you had a competive rate of $0.11! They just made their fat profit on the other end of the contract and the Texas PUC lets them get away with it! Throw in a few disconnect fees because their billing system and now you really have a cash cow - your cash, their cow!