Vistra Energy is one of the largest power producers and retail energy providers in the U.S. Excluding the Energy Harbor acquisition, Vistra owns and operates 38 gigawatts of nuclear, coal, natural gas, and solar power generation. Its retail electricity segment serves 4.3 million customers in 20 states. Vistra's retail business serves almost one third of all Texas electricity consumers. Vistra emerged from the Energy Future Holdings bankruptcy as a stand-alone entity in 2016. It acquired Dynegy in 2018 and plans to close the Energy Harbor acquisition in 2023.