 CALGARY, AB, Aug. 5, 2021 PRNewswire - The Board of Directors of TransAlta Corporation TSX: TA NYSE: TAC declared a quarterly dividend of 0.0450 per common share payable on October 1, 2021 to shareholders of record at the close of business on September 1, 2021. The Board of Directors also declared the following quarterly dividend on its Cumulative Redeemable Rate Reset First Preferred Shares for the period starting from and including June 30, 2021 up to but excluding September 30, 2021: Preferred Shares TSX Stock Symbol Dividend Rate Dividend Per Share Record Date Payment Date Series A TA.PR.D 2.877 0.17981 September 1, 2021 September 30, 2021 Series B TA.PR.E 2.139 0.13479 September 1, 2021 September 30, 2021 Series C TA.PR.F 4.027 0.25169 September 1, 2021 September 30, 2021 Series E TA.PR.H 5.194 0.32463 September 1, 2021 September 30, 2021 Series G TA.PR.J 4.988 0.31175 September 1, 2021 September 30, 2021 Please note the quarterly floating rate on the Series B Preferred Shares will be reset every quarter. 