TRANSALTA CORP

Foreign Filer Report • May 4, 2010

6-K 1 transalta6k05042010.htm TRANSALTA CORP. FORM 6-K html PUBLIC "-//IETF//DTD HTML//EN" MD Filed by Filing Services Canada Inc. (403) 717-3898

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934

For the month of May 2010

TRANSALTA CORPORATION

(Translation of registrant’s name into English)

110-12 th Avenue S.W., Box 1900, Station “M”, Calgary, Alberta, T2P 2M1

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F____

Form 40-F X

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): ____

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): ____

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes

---

No

X

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-__

I

The document listed below in this Section and filed as Exhibits 4.1 to this form 6-K is hereby filed with the Securities and Exchange Commission for the purpose of being and hereby is incorporated by reference into the following registration statements filed by TransAlta Corporation under the Securities Act of 1933, as amended:

Form:	Registration No.:
S-8	333-72454
S-8	333-101470
F-10	333-155243
F-10	333-162418

4.1 Shareholder Rights Plan Agreement amended and restated as of April 29, 2010 between TransAlta Corporation and CIBC Mellon Trust Company as rights agent.

Signatures

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.

TransAlta Corporation

By :/s/ Maryse St.-Laurent

Maryse St.-Laurent

Vice-President and Corporate Secretary

Date: May 3, 2010

EXHIBIT INDEX

4.1 Shareholder Rights Plan Agreement amended and restated as of April 29, 2010 between TransAlta Corporation and CIBC Mellon Trust Company as rights agent.

EDGAR Validation Code: 809BD084