The Texas Senate Bill 7, passed in 2002, gave 5.6 million Texans the power to choose a retail electric provider (REP) to supply electricity to their home or business. This bill facilitated a competitive energy marketplace that 85 percent of Texans can capitalize on today. Energy choice is available to residents in Houston, Dallas/Fort Worth as well as other cities in Texas.
Prior to electricity deregulation, power was supplied by regional utility monopolies that could own and operate all three parts of electric service. In response to a growing demand for competition in the industry, spurred by the success of deregulation in the airline and telecommunications industries, Congress passed the National Energy Policy Act in 1992 which created wholesale electric markets that allow for open access of generation.
When it comes to the electricity itself, there is no difference at all. A cheap electric supply is the same electricity, it's simply provided by a new supplier (unless you opt for green energy - more on that here). As suppliers buy and generate different sets of energy they also have different prices. What's more, you might be on a tariff that is simply more expensive, such as a standard tariff. If you decide to switch electricity don't equate a lower price with worse service.