According to a 2014 report by the Texas Coalition for Affordable Power (TCAP), "deregulation cost Texans about $22 billion from 2002 to 2012. And residents in the deregulated market pay prices that are considerably higher than those who live in parts of the state that are still regulated. For example, TCAP found that the average consumer living in one of the areas that opted out of deregulation, such as Austin and San Antonio, paid $288 less in 2012 than consumers in the deregulated areas."
Power to Choose is a program run by the Cheapest Electricity Rates of Texas. Its goal is to protect residents of the state from unfair energy costs and unregulated Compare Electricity Rates, as well as develop a strong infrastructure. The program provides an easy to use, online tool that give residents of the state the opportunity to compare rates, plans and other energy options. Keep in mind though, you really need to read the fine print if you decide to use Power to Choose (or any other service, for that matter).