TransAlta Announces Regulatory Approval to Extend the Mothballing of Certain Sundance Units

Press Release

CALGARY, Alberta (March 8, 2019) – TransAlta Corporation (“TransAlta” or the “Company”) (TSX: TA) (NYSE: TAC) today announced that the Alberta Electric System Operator (“AESO”) granted the extension of the mothballing for the below Sundance units:

• Sundance Unit 3 will remain mothballed until November 1, 2021, extended from the previous date of April 1, 2020; and
• Sundance Unit 5 will remain mothballed until November 1, 2021, extended from the previous date of April 1, 2020.

The extensions were requested by TransAlta based on TransAlta’s assessment of market prices and market conditions. TransAlta does have the ability to return either of the units back to full operation by providing three months’ notice to the AESO.

About TransAlta Corporation:

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. We provide municipalities, medium and large industries, businesses and utility customers clean, affordable, energy efficient, and reliable power. Today, we are one of Canada’s largest producers of wind power and Alberta’s largest producer of hydro-electric power. For over 100 years, TransAlta has been a responsible operator and a proud community-member where its employees work and live. TransAlta aligns its corporate goals with the UN Sustainable Development Goals and we have been recognized by CDP (formerly Climate Disclosure Project) as an industry leader on Climate Change Management. We are also proud to have achieved the Silver level PAR (Progressive Aboriginal Relations) designation by the Canadian Council for Aboriginal Business.

For more information about TransAlta, visit our web site at transalta.com.

For more information:

Investor Inquiries:

Sally Taylor
Manager, Investor Relations
Phone: 1-800-387-3598 in Canada and U.S.
Email: investor_relations@transalta.com

Media   Inquiries:

Phone: Toll-free media number: 1-855-255-9184
Email: ta_media_relations@transalta.com

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