<SEC-DOCUMENT>0001279569-17-002355.txt : 20171208
<SEC-HEADER>0001279569-17-002355.hdr.sgml : 20171208
<ACCEPTANCE-DATETIME>20171208090750
ACCESSION NUMBER:		0001279569-17-002355
CONFORMED SUBMISSION TYPE:	6-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20171208
FILED AS OF DATE:		20171208
DATE AS OF CHANGE:		20171208

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TRANSALTA CORP
		CENTRAL INDEX KEY:			0001144800
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		6-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15214
		FILM NUMBER:		171246164

	BUSINESS ADDRESS:	
		STREET 1:		110 12TH AVE SW BOX 1900 STATION M
		STREET 2:		CALGARY ALBERTA T2P 2MI
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2P2M1
		BUSINESS PHONE:		403-267-4724

	MAIL ADDRESS:	
		STREET 1:		110-12TH AVENUE SW
		CITY:			CALGARY ALBERTA CANADA
		STATE:			A0
		ZIP:			T2P2M1
</SEC-HEADER>
<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
<FILENAME>transalta6k.htm
<DESCRIPTION>FORM 6-K
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: bold 14pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 12pt; margin-bottom: 3pt"><DIV STYLE="font-size: 1pt; border-top: Black 4pt solid; border-bottom: Black 2pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: bold 14pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"></P>

<P STYLE="font: bold 14pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT><FONT STYLE="font-size: 14pt">UNITED
STATES</FONT><BR>
<FONT STYLE="font-size: 14pt">SECURITIES AND EXCHANGE COMMISSION</FONT><BR>
<FONT STYLE="font-size: 12pt">Washington, D.C. 20549</FONT></P>

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>FORM
6-K</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"><FONT STYLE="font-size: 12pt"><B>REPORT
OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934</B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt"><FONT STYLE="font-size: 10pt">For the month of December 2017</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 24pt"><B>TRANSALTA
CORPORATION</B></FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 24pt"><B></B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt">(Translation
of registrant&rsquo;s name into English)</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt"><B>110-12<SUP>th
</SUP>Avenue S.W., Box 1900, Station &ldquo;M&rdquo;, Calgary, Alberta, T2P 2M1</B></FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt"><B></B></FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="font-size: 10pt">(Address
of principal executive offices)</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;&nbsp;</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"><FONT STYLE="font-size: 10pt">I<FONT STYLE="font-family: Times New Roman, Times, Serif">ndicate
by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.</FONT></FONT></P>

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 60%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 50%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form 20-F &#9744;</FONT></TD>
    <TD STYLE="width: 50%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form 40-F &#9746;</FONT></TD></TR>
</TABLE>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">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): ____</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">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): ____</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt"></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 3pt; margin-bottom: 12pt"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 4pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt">&nbsp;</P>


<!-- Field: Page; Sequence: 1 -->
    <DIV STYLE="margin-bottom: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"></P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>I</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">The document listed below as Exhibit 99.1 to this Form 6-K is a
copy of the Registrant&rsquo;s news release dated December 8, 2017 announcing &ldquo;TransAlta Comments on Provincial Carbon Credit
Regime&rdquo;.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">This news release is being furnished, not filed,
and will not be incorporated by reference into any registration statement filed by TransAlta Corporation under the Securities Act
of 1933, as amended.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt 40.5pt; text-align: justify; text-indent: 0in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%; padding-right: 5.4pt; padding-bottom: 12pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-indent: 0in"><FONT STYLE="font-size: 10pt">99.1</FONT></TD>
    <TD STYLE="width: 85%; padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&ldquo;TransAlta Comments on Provincial Carbon Credit Regime&rdquo;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt 40.5pt; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>



<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>


<!-- Field: Page; Sequence: 2 -->
    <DIV STYLE="margin-bottom: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Signatures</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 24pt">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 CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 12pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2"><FONT STYLE="font-size: 10pt"><B>TransAlta Corporation</B></FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 52%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 43%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt"><I>/s/ Donald Tremblay</I></FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD></TD>
    <TD><FONT STYLE="font-size: 10pt">Donald Tremblay</FONT></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Chief Financial Officer</FONT></TD></TR>
</TABLE>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 24pt"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 9.9pt 0 0"><FONT STYLE="font-size: 10pt"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 24pt">Date: December 8, 2017</P>



<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 9.9pt 0 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0.25in 12pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<!-- Field: Page; Sequence: 3 -->
    <DIV STYLE="margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="page-break-before: always; margin-top: 6pt">&nbsp;</DIV>
    <!-- Field: /Page -->

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0.25in 12pt 0"></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in"><B>EXHIBIT INDEX</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%; padding-right: 5.4pt; padding-bottom: 12pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-indent: 0in"><FONT STYLE="font-size: 10pt">99.1</FONT></TD>
    <TD STYLE="width: 85%; padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt">Press release dated December 8, 2017 announcing &ldquo;TransAlta Comments on Provincial Carbon Credit Regime&rdquo;</FONT></TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt">&nbsp;</P>



<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0in"></P>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex991.htm
<DESCRIPTION>NEWS RELEASE DATED DECEMBER 8, 2017
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0; text-align: right"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Exhibit 99.1</B></FONT></P>

<P STYLE="margin: 0; text-align: right"><FONT STYLE="font: 8pt Arial, Helvetica, Sans-Serif"><B>&nbsp;</B></FONT></P>

<P STYLE="margin: 0; text-align: right"><FONT STYLE="font: 8pt Arial, Helvetica, Sans-Serif"><B></B></FONT></P>

<P STYLE="font: 12pt Arial, Helvetica, Sans-Serif; margin: 0pt 0 12pt"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Arial, Helvetica, Sans-Serif; margin: 0pt 0 12pt"></P>

<P STYLE="font: 12pt Arial, Helvetica, Sans-Serif; margin: 0pt 0 12pt"></P>

<P STYLE="font: 12pt Arial, Helvetica, Sans-Serif; margin: 0pt 0 12pt"><B>TransAlta Comments on Provincial Carbon Credit Regime</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">CALGARY, Dec.&nbsp;8, 2017 /CNW/ - TransAlta Corporation (&quot;TransAlta&quot;
or the &quot;Company&quot;) (TSX: TA; NYSE: TAC) today responded favourably to details of the Government of Alberta's determination
to permit carbon credits to be earned by existing wind and hydro generation in the Alberta fleet.</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">On December 6, 2017, the Government of Alberta announced its
intention to adopt a carbon credit regime that will fully recognize the value of carbon reductions from the generation of electricity
from existing renewable assets.&nbsp;Under Alberta's output based allocation system for carbon emissions, TransAlta's existing
wind and hydro facilities will receive credits for emissions below the performance standard of 0.37 tonnes of CO<SUB>2</SUB> per
MWh.&nbsp;Effective January 1, 2018, these credits can be used to offset up to 40%, escalating to 60% by 2022, of the carbon price
obligations incurred by generation that exceeds the performance standard, which will be charged a price of $30 per tonne of CO<SUB>2</SUB>.&nbsp;The
carbon credit regime will allow the Company to allocate the emissions benefits from its existing renewables generation in Alberta
to offset the direct carbon costs of its thermal generation, including generation from its coal-to-gas converted units.&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">&quot;The recent announcement by the provincial government
will more competitively position our existing renewable generation,&quot; said Dawn Farrell, President and Chief Executive Officer.
&quot;By treating existing renewable generation equally, we expect to eventually receive $30 million to $50 million annually in
credits attributable to our existing renewable assets.&quot;&nbsp; &nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">The <I>Pan-Canadian Framework on Clean Growth and Climate
Change</I> agreed to in late 2016 by the Government of Canada and most provinces and territories, including Alberta, is expected
to result in the carbon price increasing to $40 per tonne of CO<SUB>2 </SUB>in 2021 and $50 per tonne of CO<SUB>2</SUB> in 2022,
thereby increasing the value of the carbon credits in the future.</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0"><B><I>About TransAlta Corporation:</I></B>&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0"><I>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. &nbsp;</I></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0"><I>For more information about TransAlta, visit our web site
at transalta.com.</I></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0"><B><I>Forward-Looking Statements&nbsp; </I></B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0"><I>This news release contains forward-looking statements and
forward-looking information within the meaning of applicable securities laws. The use of any of the words &quot;expect&quot;, &quot;anticipate&quot;,
&quot;continue&quot;, &quot;estimate&quot;, &quot;may&quot;, &quot;will&quot;, &quot;project&quot;, &quot;should&quot;, &quot;propose&quot;,
&quot;plans&quot;, &quot;intends&quot; and similar expressions are intended to identify forward-looking information or statements.
More particularly, and without limitation, this news release contains forward-looking statements and information relating to: the
Government of Alberta's carbon credit regime, including that it will fully recognize the value of carbon reductions from existing
renewable generation and &nbsp;that TransAlta's existing wind and hydro facilities will receive credits for emissions below the
performance standard of 0.37 tonnes of CO2 per MWh; that carbon credits can be used to offset up to 40%, escalating to 60% by 2022,
of the carbon price obligations; the carbon price obligation will be $30 per tonne of CO2.; and the expected benefits to be realized
by the Company as a result of the Government of Alberta's carbon credit regime, including facilitating a more competitive position
for the Company's thermal units; the carbon price increasing to $40 per tonne of CO2 in 2021 and $50 per tonne of CO2 in 2022;
the increase in value of the carbon credits in the future; and the receiving between $30 million and $50 million annually in credits
attributed to the Company's existing renewable generation.&nbsp;These statements are based on TransAlta's belief and assumptions
based on information available at the time the assumptions were made. These statements are subject to a number of risks and uncertainties
that may cause actual results to differ materially from those contemplated by the forward-looking statements. Some of the factors
that could cause such differences include: legislative or regulatory developments, including as it pertains to the Alberta capacity
market; the Federal and/or Provincial governments failing to implement the proposed legislation or regulations; the Federal and/or
Provincial governments adopting different carbon prices rules; the Provincial government determining not to continue the proposed
carbon regime regulation beyond its expected expiry in 2022; and other risk factors contained in the Company's annual information
form and management's discussion and analysis. Readers are cautioned not to place undue reliance on these forward-looking statements
or forward-looking information, which reflect TransAlta's expectations only as of the date of this news release. The purpose of
the financial outlooks contained in this news release are to give the reader information about management's current expectations
and plans and readers are cautioned that such information may not be appropriate for other purposes. TransAlta disclaims any intention
or obligation to update or revise these forward-looking statements, whether as a result of new information, future events or otherwise,
except as required by law.</I></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">Note: All financial figures are in Canadian dollars.</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">SOURCE TransAlta Corporation</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">View original content: http://www.newswire.ca/en/releases/archive/December2017/08/c1152.html</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">%CIK: 0001144800</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0"><B>For further information: </B>Investor Inquiries: Sally Taylor,
Manager, Investor Relations, Phone: 1-800-387-3598 in Canada and U.S., Email: investor_relations@transalta.com; Media Inquiries:
Stacey Hatcher, Manager, Communications, Phone: Toll-free media number: 1-855-255-9184, Email: ta_media_relations@transalta.com</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">CO: TransAlta Corporation</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 9.75pt 0">CNW 08:00e 08-DEC-17</P>



<P STYLE="font: 12pt Arial, Helvetica, Sans-Serif; margin: 0pt 0 12pt"></P>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
