Energy Future Holdings Corp. (EFH) is a Dallas-based, privately held energy company with a portfolio of competitive and regul ... ated energy companies. These businesses serve the high-growth Texas electricity market, which is one of the world’s largest and among the nation’s most successful competitive markets. EFH’s competitive businesses consist primarily of TXU Energy and Luminant. Its regulated operations consist of Oncor. Luminant is a competitive power generation business, including mining, wholesale marketing and trading, and development operations. Luminant has nearly 17,000 megawatts of generation in Texas, including 2,300 MW fueled by nuclear power and 8,000 MW fueled by coal. Oncor operates the largest electricity distribution and transmission system in Texas with more than 3.2 million delivery points and 120,000 miles of distribution and transmission lines. TXU Energy is a market-leading competitive retail electricity provider with 1.7 million residential and business customers in Texas. read more