<SEC-DOCUMENT>0001171843-25-008012.txt : 20251218
<SEC-HEADER>0001171843-25-008012.hdr.sgml : 20251218
<ACCEPTANCE-DATETIME>20251218173038
ACCESSION NUMBER:		0001171843-25-008012
CONFORMED SUBMISSION TYPE:	6-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20251218
FILED AS OF DATE:		20251218
DATE AS OF CHANGE:		20251218

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TRANSALTA CORP
		CENTRAL INDEX KEY:			0001144800
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		6-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15214
		FILM NUMBER:		251584157

	BUSINESS ADDRESS:	
		STREET 1:		TRANSALTA PLACE
		STREET 2:		1400, 1100 - 1ST STREET S.E.
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2G 1B1
		BUSINESS PHONE:		403-267-2014

	MAIL ADDRESS:	
		STREET 1:		TRANSALTA PLACE
		STREET 2:		1400, 1100 - 1ST STREET S.E.
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2G 1B1
</SEC-HEADER>
<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
<FILENAME>f6k_121825.htm
<DESCRIPTION>FORM 6-K
<TEXT>
<html><head><title></title></head><body style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><div align="center"><div style="margin-top: 3pt; margin-bottom: 12pt;"><div style="font-size: 1pt; border-top: Black 2.5pt solid; border-bottom: Black 1.1pt solid; width: 100%;">&#160;</div></div><p style="font-size: 14pt;" align="center"><strong>UNITED STATES</strong><br /><strong>SECURITIES AND EXCHANGE COMMISSION</strong><br /><strong>Washington, D.C. 20549</strong></p><p style="font-size: 14pt; text-transform: uppercase;" align="center"><strong>Form 6-K</strong></p><p style="text-align: center;"><strong></strong></p><p style="text-align: center;"><strong>REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934</strong></p><p style="text-align: center;"><strong></strong><strong>For the month of December 2025</strong></p><p style="text-align: center;">Commission File Number: <strong>001-15214</strong></p><p style="text-align: center;"><font style="font-size: 12pt;"><strong>TransAlta Corporation</strong></font><br />(Translation of registrant's name into English)</p><p style="text-align: center;"><strong>Suite 1400, 1100 &#8211; 1st Street S.E., Calgary, Alberta, T2G 1B1</strong><br />(Address of principal executive office)</p></div><p>Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.<br />Form 20-F [&#160;&#160; ] &#160;&#160;&#160;&#160;&#160;Form 40-F [&#160;X ]</p><p>&#160;</p><p>&#160;</p><!--<p>Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): <u>&#160;&#160;&#160;&#160;&#160;&#160;</u></p><p><strong>Note:&#160;</strong>Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.</p><p>Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): <u>&#160;&#160;&#160;&#160;&#160;&#160;</u></p><p><strong>Note:&#160;</strong>Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant's "home country"), or under the rules of the home country exchange on which the registrant's securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant's security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.&#160;</p><hr style="page-break-after: always;" noshade="noshade" /><p> On December 18, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference. <br /><br />(c) Exhibit 99.1. Press release dated December 18, 2025</p><p></p>--><hr style="page-break-after: always;" noshade="noshade" /><p style="text-align: center;"><strong>SIGNATURES</strong></p><p>Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.</p><table style="font-family: Times New Roman; font-size: 10pt;" border="0" width="100%" cellspacing="0" cellpadding="0"><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td style="text-decoration: underline;" align="center" width="47%"><strong>&#160;&#160;&#160;&#160;TransAlta Corporation&#160;&#160;&#160;&#160;</strong></td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%">(Registrant)</td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%">&#160;</td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%"></td></tr><tr valign="top"><td width="47%">Date: December 18, 2025</td><td width="6%">&#160;</td><td style="text-decoration: underline;" align="center" width="47%">&#160;&#160;&#160;&#160;/s/ Joel Hunter&#160;&#160;&#160;&#160;</td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%">Joel Hunter</td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%">Executive Vice President Finance and Chief Financial Officer</td></tr><tr valign="top"><td width="47%">&#160;</td><td width="6%">&#160;</td><td align="center" width="47%"></td></tr></table><p><hr style="page-break-after: always;" noshade="noshade" /><p style="text-align: center;"><font style="font-size: 10pt;"><strong>EXHIBIT INDEX</strong></font></p><p style="text-align: center;"><font style="font-size: 10pt;">&#160;</font></p><table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0"><tr><td style="text-decoration: underline;" valign="bottom"><font style="font-size: 10pt;"><strong>Exhibit Number</strong></font></td><td width="20"><font style="font-size: 10pt;">&#160;</font></td><td style="text-decoration: underline;" valign="bottom"><font style="font-size: 10pt;"><strong>Description</strong></font></td></tr><tr><td><font style="font-size: 10pt;"></font></td><td width="20"><font style="font-size: 10pt;">&#160;</font></td><td><font style="font-size: 10pt;">&#160;</font></td></tr><tr><td style="vertical-align: top;"><font style="font-size: 10pt;"><a href="exh_991.htm">99.1</a></font></td><td width="20"><font style="font-size: 10pt;">&#160;</font></td><td style="vertical-align: top;"><font style="font-size: 10pt;"><a href="exh_991.htm">TransAlta Provides Notice to Mothball Sheerness Unit 1</a> </font></td></tr></table></p></body></html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>exh_991.htm
<DESCRIPTION>PRESS RELEASE
<TEXT>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html lang="en-US"><head><title>EdgarFiling</title><meta content="text/html; charset=windows-1252" ><meta name="GENERATOR" content="MSHTML 8.00.7601.18094" ></head><body bgcolor="#ffffff"><p style="text-align: right;"><strong>EXHIBIT 99.1</strong></p><p style="text-align: center;"><font style="font-size: 14pt;"><strong>TransAlta Provides Notice to Mothball Sheerness Unit 1</strong></font></p><p style="text-align: center;"><strong></strong></p><p>
 <p align="justify">CALGARY, Alberta, Dec.  18, 2025  (GLOBE NEWSWIRE) -- Alberta Power (2000) Ltd., a subsidiary of TransAlta Corporation (TransAlta or the Company) (TSX: TA) (NYSE: TAC), provided notice to the Alberta Electric System Operator on December 18, 2025, that Sheerness Unit 1 will be temporarily mothballed effective April 1, 2026, for a period of up to two years. TransAlta maintains the flexibility to return the mothballed unit to service when market fundamentals or contracting opportunities are secured. The unit will remain available and fully operational through the winter season and Sheerness Unit 2 will remain fully in service.</p>  <p align="justify">"We have made the prudent financial decision to temporarily mothball Sheerness Unit 1 while reserving it for future economic opportunities. There is significant value at our Alberta thermal sites and we remain very pleased with the continued progress on our data centre strategy. Today's decision ensures we preserve the long-term optionality of the asset," said John Kousinioris, President and Chief Executive Officer.</p>  <p><strong>About TransAlta Corporation: </strong></p>  <p align="justify">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 affordable, energy efficient and reliable power. Today, TransAlta is one of Canada&#8217;s largest producers of wind power and Alberta&#8217;s largest producer of thermal generation and hydro-electric power. For over 114 years, TransAlta has been a responsible operator and a proud member of the communities where we operate and where our employees work and live. TransAlta aligns its corporate goals with the UN Sustainable Development Goals and the Future-Fit Business Benchmark, which also defines sustainable goals for businesses. Our reporting on climate change management has been guided by the International Financial Reporting Standards (IFRS) S2 Climate-related Disclosures Standard and the Task Force on Climate-related Financial Disclosures (TCFD) recommendations. TransAlta has achieved a 70 per cent reduction in GHG emissions or 22.7 million tonnes CO2e since 2015 and received an upgraded MSCI ESG rating of AA.</p>  <p align="justify">For more information about TransAlta, visit our web site at <u>transalta.com</u>.</p>  <p><strong>Cautionary Statement Regarding Forward-Looking Information </strong></p>  <p align="justify">This news release includes &#8220;forward-looking information,&#8221; within the meaning of applicable Canadian securities laws, and &#8220;forward-looking statements,&#8221; within the meaning of applicable United States securities laws, including the Private Securities Litigation Reform Act of 1995 (collectively referred to herein as &#8220;forward-looking statements&#8221;). Forward-looking statements are not facts, but only predictions and generally can be identified by the use of statements that include phrases such as &#8220;may&#8221;, &#8220;will&#8221;, &#8220;believe&#8221;, &#8220;expect&#8221;, &#8220;estimate&#8221;, &#8220;anticipate&#8221;, &#8220;intend&#8221;, &#8220;plan&#8221;, &#8220;forecast&#8221;, &#8220;continue&#8221; or other similar words. Forward-looking statements are intended to provide the reader information about management&#8217;s current expectations and plans and readers are cautioned that such information may not be appropriate for other purposes. Forward-looking statements are subject to important risks and uncertainties and are based on certain key assumptions. All forward-looking statements reflect TransAlta&#8217;s beliefs and assumptions based on information available at the time the statements were made and as such are not guarantees of future performance. As actual results could vary significantly from the forward-looking statements, you should not put undue reliance on forward-looking statements and should not use future-oriented information or financial outlooks for anything other than their intended purpose. We do not update our forward-looking statements due to new information or future events, unless we are required to by law. For additional information on the assumptions made, and the risks and uncertainties which could cause actual results to differ from the anticipated results, refer to our most recent MD&amp;A and the 2024 Integrated Report, including the section titled &#8220;Governance and Risk Management&#8221; in our MD&amp;A for the year ended December 31, 2024, filed under TransAlta&#8217;s profile on SEDAR+ at www.sedarplus.ca and with the U.S. Securities and Exchange Commission at www.sec.gov.</p>  <p>Note: All financial figures are in Canadian dollars unless otherwise indicated.</p>  <p align="justify"><strong>For more information:</strong></p> <table style="width:100%; border-collapse:collapse !important;;border-collapse: collapse; "><tr><td style="max-width:50%; width:50%; min-width:50%;;vertical-align: bottom ; "><strong><em>Investor Inquiries:</em></strong></td><td style="max-width:50%; width:50%; min-width:50%;;vertical-align: bottom ; "><strong><em>Media Inquiries:</em></strong></td></tr><tr><td style="vertical-align: bottom ; ">Phone: 1-800-387-3598 in Canada and US</td><td style="vertical-align: bottom ; ">Phone: 1-855-255-9184</td></tr><tr><td style="vertical-align: bottom ; ">Email: investor_relations@transalta.com</td><td style="vertical-align: bottom ; ">Email: ta_media_relations@transalta.com</td></tr></table> <p><br ></p> </p><p ></p></body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
