TXU Corp., a holding company, through its subsidiaries, manages a portfolio of regulated energy businesses in North America, primarily in Texas. The company, through its subsidiary, TXU Energy Holdings engages in electricity generation and retail and wholesale energy sales; and through TXU Electric Delivery engages in regulated electricity transmission and distribution operations. TXU provided electricity and related services to approximately 2.5 million retail electricity customers in Texas, as of December 31, 2004. The company also produced approximately 18,300 megawatt (MW) of electricity, including 2,300 MW of nuclear, 5,837 MW of lignite/coal-fired, and 10,228 MW of gas/oil fired electricity. TXU Corp. is headquartered in Dallas, Texas.