SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 6-K
Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 under
the Securities Exchange Act of 1934
For the month of May 2007
Commission File Number: 1-8887
TRANSCANADA PIPELINES LIMITED
(Translation of Registrant’s Name into English)
450 – 1st Street S.W., Calgary, Alberta, T2P 5H1, Canada
(Address of Principal Executive Offices)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:
Form 20-F o 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): o
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): o
Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.
Yes o No x
The following document is hereby filed with the Securities and Exchange Commission for the purpose of being and hereby is incorporated by reference into Registration Statement on Form F-9 (File No. 333-141122) of TransCanada PipeLines Limited:
1 First Supplemental Subordinated Indenture dated May 3, 2007 among TransCanada PipeLines Limited, TransCanada Corporation, with respect to certain provisions, and The Bank of Nova Scotia Trust Company of New York, as trustee.
2
Signature
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.
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TRANSCANADA PIPELINES LIMITED |
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Date: May 4, 2007 |
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By: |
/s/ Robert J. Pitt |
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Name: Robert J. Pitt |
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Title: Vice President, Finance Law |
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EXHIBIT INDEX
1 First Supplemental Subordinated Indenture dated May 3, 2007 among TransCanada PipeLines Limited, TransCanada Corporation, with respect to certain provisions, and The Bank of Nova Scotia Trust Company of New York, as trustee.
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