Vistra Corp. is an energy company, which engages in the provision of electricity and power generation. It operates through the following segments: Retail, Texas, East, West, Sunset and Asset Closure. The Retail segment sells electricity and natural gas to residential, commercial and industrial customers. The Texas and East segments engages in electricity generation, wholesale energy sales and purchases, commodity risk management activities, fuel production and fuel logistics management. The West segment represents Vistra's electricity generation operations in CAISO. The Sunset segment consists of generation plants with announced retirement plans. The Asset Closure segment is engaged in the decommissioning and reclamation of retired plants and mines. The company was founded in 1882 and is headquartered in Irving, TX.