An anonymous director reports

MEDIA ADVISORY: TRANSALTA AND TRANSALTA RENEWABLES SECOND QUARTER 2023 RESULTS AND CONFERENCE CALL

TransAlta Corp. will release its second quarter 2023 results before markets open on Friday, Aug. 4, 2023. A conference call and webcast to discuss the results will be held for investors, analysts, members of the media and other interested parties the same day beginning at 9 a.m. Mountain Time (11 a.m. ET). The media will be invited to ask questions following analysts.

TransAlta Renewables Inc. will release its second quarter 2023 results before markets open on Thursday, Aug. 3, 2023. Any questions regarding TransAlta Renewables may be asked on the TransAlta conference call.

Second quarter 2023 conference call

Toll-free North American participants call: 1-888-664-6392

Related materials will be available on the investor centre section of TransAlta's website. If you are unable to participate in the call, the instant replay is accessible at 1-888-390-0541 (Canada and United States toll-free) with TransAlta pass code 650793 followed by the pound sign. A transcript of the broadcast will be posted on TransAlta's website once it becomes available.

About TransAlta Corp.

TransAlta owns, operates and develops a diverse fleet of electrical power generation assets in Canada, the United States and Australia with a focus on long-term shareholder value. TransAlta provides municipalities, medium and large industries, businesses, and utility customers with clean, affordable, energy-efficient and reliable power. Today, TransAlta is one of Canada's largest producers of wind power and Alberta's largest producer of hydroelectric power. For over 111 years, TransAlta has been a responsible operator and a proud member of the communities where it operates and where its employees work and live. TransAlta aligns its corporate goals with the UN Sustainable Development Goals and its climate change strategy with CDP (formerly Climate Disclosure Project) and the Task Force on Climate-related Financial Disclosures (TCFD) recommendations. TransAlta has achieved a 68-per-cent reduction in greenhouse gas emissions or 22 million tonnes since 2015 and has received scores of A- from CDP and A from MSCI.

About TransAlta Renewables Inc.

TransAlta Renewables is among the largest of any publicly traded renewable independent power producers (IPP) in Canada. Its asset platform and economic interests are diversified in terms of geography, generation and counterparties and consist of interests in 26 wind facilities, 13 hydroelectric facilities, eight natural gas generation facilities, two solar facilities, one natural gas pipeline and one battery storage project, representing an ownership interest of 2,968 megawatts of owned generating capacity, located in the provinces of British Columbia, Alberta, Ontario, Quebec, New Brunswick, the states of Pennsylvania, New Hampshire, Wyoming, Massachusetts, Michigan, Minnesota, North Carolina, Washington and the state of Western Australia.