Vistra Energy Corp., through its subsidiaries, engages in the integrated power business in Texas. The company operates through Wholesale Generation and Retail Electricity segments. The Wholesale Generation segment engages in the electricity generation, wholesale energy sales and purchases, commodity risk management, fuel production, and fuel logistics management activities. As of February 26, 2018, this segment had a fleet of generation facilities totaling approximately 14,000 megawatts of generation in Texas, including 2,300 megawatts fueled by nuclear power, 4,000 megawatts fueled by coal, and 7,500 megawatts fueled by natural gas. The Retail Electricity segment is involved in the retail sale of electricity and related services to residential, commercial, and industrial customers under the TXU Energy brand. This segment served approximately 1.7 million residential and business customers. The company was formerly known as TCEH Corp. and changed its name to Vistra Energy Corp. in November 2016. The company is based in Irving, Texas.