Compared to the rest of the nation, data from the U.S. Energy Information Administration which publishes annual state electric prices  shows that Texas' electric prices did rise above the national average immediately after deregulation from 2003 to 2009, but, from 2010 to 2015 have moved significantly below the national average price per kWh, with a total cost of $0.0863 per kWh in Texas in 2015 vs. $0.1042 nationally, or 17 percent lower in Texas. Between 2002-2014 the total cost to Texas consumers is estimated to be $24B, an average of $5,100 per household, more than comparable markets under state regulation. 
The complaints filed against providers aren't a perfect mirror of the J.D. Power customer satisfactions scores. Just Energy, which earned only two J.D. Power Circles and earned the second-lowest score, had only 21 complaints recorded with the Public Utility Commission. But it's helpful to view these complaints in aggregate: Over 50 percent of the 1,119 total complaints fall under "billing" — another reason to seek out a provider with high customer satisfaction in that area in particular.
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In this free market competing electricity retailers buy electricity wholesale from private power generators to sell at retail to around 85% of Texas residents. The partnership between generators and retailers is governed by the Electric Reliability Council of Texas, or ERCOT, which attempts to balance the power grid’s electricity supply and demand by purchasing small amounts of electricity at 15-minute intervals throughout the day.