Vistra Energy Corp, formerly TCEH Corp. is a holding company. The Company is an energy company, which is focused on energy and power generation markets through operation as a generator and retailer of electricity in Texas market. Its portfolio of businesses consists primarily of Luminant and TXU Energy. It is engaged in electricity market activities in Texas, including electricity generation, wholesale energy sales and purchases, commodity risk management activities and retail electricity operations. Luminant generates and sells electricity and related products from its fleet of generation facilities totaling approximately 17,000 megawatts of generation in Texas, including 2,300 megawatts fueled by nuclear power, 8,000 megawatts fueled by coal and 6,000 megawatts fueled by natural gas. The Company is a purchaser of wind-generated electricity. TXU Energy sells retail electricity and services to approximately 1.7 million residential and business customers in Texas.