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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

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

For the month of February 2018

Commission File No. 1-8887

TransCanada PipeLines Limited
(Translation of Registrant's Name into English)

450 - 1 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    þ


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

Exhibit 99.1 to this report, filed on Form 6-K, shall be incorporated by reference into the following Registration Statements under the Securities Act of 1933, as amended, of the registrant: Form F-10 (Reg. No. 333-221898).






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.


Date: February 16, 2018

 
TRANSCANADA PIPELINES LIMITED
 
 
 
 
By:
/s/ Donald R. Marchand
 
 
Donald R. Marchand
 
 
Executive Vice-President and Chief Financial Officer
 
 
 
 
 
 
 
By:
/s/ Christine R. Johnston
 
 
Christine R. Johnston
 
 
Vice-President, Law and Corporate Secretary





EXHIBIT INDEX


1.
Schedule of earnings coverage calculations at December 31, 2017.