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In 2006, the nine Texas investor-owned utilities (IOUs) exceeded their statewide legislative energy efficiency goals for the fourth straight year. The utilities achieved 164 Megawatts (MW) of peak demand reduction, which was 27% above their 129 MW goal, and 366 Gigawatt-hours (GWh) of energy reduction. These energy savings correspond to an equivalent reduction of 551,317 pounds of nitrogen oxide (NOx) emissions per year.

Most of the utilities' programs involve financial incentives, which were paid to project sponsors to offset the costs of a variety of energy efficiency improvements. The total amount of incentive funds expended to achieve 2006 savings was just over $60 million.

The Environmental Protection Agency (EPA) recognized four utilities in 2006 for their ENERGY STAR® Home Programs. They were CenterPoint Energy Company, TXU Electric Delivery Company (now Oncor Electric Delivery), Entergy Gulf States, Inc, and Texas-New Mexico Power Company. CenterPoint was also recognized by the EPA with a "Sustained Excellence Award".

As of January 1, 2007, the utility programs implemented after electric industry restructuring in Texas had produced 756 MW of peak demand reduction and 2,005 GWh of electricity savings for the years 1999 though 2006. This translates to approximately 2,660 tons of NOx emissions reductions.