 IRVING, Texas, April 26, 2021 PRNewswire -- Vistra NYSE: VST announced today that it is: Estimating the financial impact of Winter Storm Uri Uri on 2021 Ongoing Operations Adjusted EBITDA1 and Ongoing Operations Adjusted Free Cash Flow before Growth FCFbG1 at 1,600 million, including self-help initiatives. Reissuing 2021 Ongoing Operations Adjusted EBITDA1 and Ongoing Operations Adjusted FCFbG1 guidance ranges at 1,475 to 1,875 million and 200 to 600 million, respectively. 