transalta13da.htm
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

SCHEDULE 13D
(Amendment No. 6)*

Under the Securities Exchange Act of 1934

TransAlta Corporation
__________________________________________________________________________________
(Name of Issuer)

Common Shares, no par value
__________________________________________________________________________________
(Title of Class of Securities)

89346D107
________________________________________________________________________________
(CUSIP Number)


John Staikos
Senior Vice President and General Counsel
LS Power Equity Advisors, LLC
1700 Broadway, 35th Floor
New York, New York 10019
212-615-3441
______________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

February 13, 2008
_________________________________________________________________________
(Date of Event Which Requires Filing of this Statement)
 

 
If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. [  ]
 
Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Section 240.13d-7 for other parties to whom copies are to be sent.
 
(Continued on followings pages)

(Page 1 of 12 Pages)

 
________________________ 
*   The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.
     The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") or otherwise subject to the liabilities of that section of the Exchange Act but shall be subject to all other provisions of the Exchange Act (however, see the Notes).
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 2 of 12 Pages

 
1.
Names of Reporting Persons.
 
LSP Penn Holdings, LLC
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]   
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
OO
 

 
 
 
 
CUSIP No. 89346D107
13D
Page 3 of 12 Pages
 
 
1.
Names of Reporting Persons.
 
LSP Penn Holdings II, LLC
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
 
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
OO
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 4 of 12 Pages
 
 
1.
Names of Reporting Persons.
 
LS Power Partners, L.P.
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
PN
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 5 of 12 Pages

 
1.
Names of Reporting Persons.
 
LS Power Partners II, L.P.
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
PN
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 6 of 12 Pages

 
1.
Names of Reporting Persons.
 
Luminus Management, LLC
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
PN
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 7 of 12 Pages

 
1.
Names of Reporting Persons.
 
Luminus Asset Partners, L.P.
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Delaware
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
PN
 
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 8 of 12 Pages

1.
Names of Reporting Persons.
 
Luminus Energy Partners Master Fund, Ltd.
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
WC
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Bermuda
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
OO

 
 
 
 
 
CUSIP No. 89346D107
13D
Page 9 of 12 Pages

 
1.
Names of Reporting Persons.
 
LPCO Investments S.a.r.l.
 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
 
 
(a) [   ]
(b) [X]
3.
SEC USE ONLY
 
4.
Source of Funds (See Instructions)
 
OO
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)
[   ]  
6.
Citizenship or Place of Organization
 
Luxembourg
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person with
7.
Sole Voting Power
0
8.
Shared Voting Power
16,782,400
9.
Sole Dispositive Power
0
10.
Shared Dispositive Power
16,782,400
11.
Aggregate Amount Beneficially Owned by Each Reporting Person
16,782,400
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
[   ]  
13.
Percent of Class Represented by Amount in Row (11)
 
8.3%
14.
Type of Reporting Person (See Instructions)
 
OO
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 10 of 12 Pages

This Amendment No. 6 (this "Amendment") amends and supplements the Schedule 13D initially filed on June 27, 2007 (the "Original Filing") and subsequently amended by the Reporting Persons relating to the Common Shares, no par value (the "Shares"), of TransAlta Corporation, a corporation incorporated under the Canada Business Corporations Act (the "Issuer"). Information reported in the Original Filing remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment or any previously filed amendments. Capitalized terms used but not defined in this Amendment have the respective meanings set forth in the Original Filing.
 
Item 4. Purpose of Transaction.
 
Item 4 is hereby amended and supplemented as follows:
 
On February 13, 2008, certain of the Reporting Persons issued a press release commenting on a recent report by Standard & Poor's relating to the Issuer.
 
A copy of the press release is included as Exhibit 7.6 hereto and is incorporated herein by reference.
 
 
Item 7. Material to be Filed as Exhibits.
 
Exhibit
Number
Description
7.6
 
Press release, dated February 13, 2008
 
 
 
 
 
 
 
CUSIP No. 89346D107
13D
Page 11 of 12 Pages
 
 
SIGNATURE
 
After reasonable inquiry and to the best of the knowledge and belief of the undersigned, the undersigned certifies that the information set forth herein is true, complete and correct.

Dated: February 14, 2008


 
LSP Penn Holdings, LLC
     
     
 
By:
/s/ Darpan Kapadia
 
Name:
Darpan Kapadia
 
Title:
Managing Director



 
LSP Penn Holdings II, LLC
     
     
 
By:
/s/ Darpan Kapadia
 
Name:
Darpan Kapadia
 
Title:
Managing Director



 
LS Power Partners, L.P.
     
     
 
By:
/s/ Darpan Kapadia
 
Name:
Darpan Kapadia
 
Title:
Managing Director



 
LS Power Partners II, L.P.
     
     
 
By:
/s/ Darpan Kapadia
 
Name:
Darpan Kapadia
 
Title:
Managing Director



 
Luminus Management, LLC
     
     
 
By:
/s/ Paul Segal
 
Name:
Paul Segal
 
Title:
President

 
 
 
 
 
CUSIP No. 89346D107
13D
Page 12 of 12 Pages

 
 
Luminus Asset Partners, L.P.
     
     
 
By:
/s/ Paul Segal
 
Name:
Paul Segal
 
Title:
President



 
Luminus Energy Partners Master Fund, Ltd.
     
     
 
By:
/s/ Paul Segal
 
Name:
Paul Segal
 
Title:
Director



 
LPCO Investments S.à.r.l.
     
     
 
By:
Paul Segal, as attorney-in-fact
     
 
By:
/s/ Paul Segal
 
Name:
Paul Segal