Vistra (formerly known as Vistra Energy, TCEH) is a holding company that operates an integrated retail and electric power generation provider. It operates through six segments: Retail, Texas, East, West, Sunset, and Asset Closure. The Retail segment sells electricity and natural gas to residential, small business, commercial, and industrial customers. The Texas, the East, and The West segments offer electricity generation operations. The Sunset segment represents generation plants and announcing retirement plans from our other operating plants in the Texas, East, and West segments. The Asset Closure segment is engaged in the decommissioning and reclamation of retired plants and mines.