6-K

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 2017

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):

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):

Exhibit 99.1 to this report, furnished on Form 6-K, shall be incorporated by reference into the following Registration Statement under the Securities Act of 1933, as amended, of the registrant: Form F-10 (File No. 333-208588).

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 17, 2017

TRANSCANADA PIPELINES LIMITED
By:	/s/ Donald R. Marchand
	Donald R. Marchand Executive Vice-President, Corporate Development and Chief Financial Officer
By:	/s/ G. Glenn Menux
	G. Glenn Menuz Vice-President and Controller

EXHIBIT INDEX

99.1 Schedule of earnings coverage calculations at December 31, 2016.

EX-99.1

EXHIBIT 99.1

TransCanada PipeLines Limited

EARNINGS COVERAGE

Supplemental Financial Information (unaudited)

Exhibit to the Dec 31, 2016 Consolidated Financial Statements

December 31, 2016

The following financial ratio has been calculated on a consolidated basis for twelve-month period ended Dec 31, 2016 and is based on unaudited financial information. The financial ratios have been calculated based on financial information prepared in accordance with US generally accepted accounting principles. The following ratios have been prepared based on net income:

	Dec 31, 2016
Earnings coverage on long-term debt and current liabilities	1.1 times
Earnings coverage on long-term debt and current liabilities excluding non-cash impairment charges for Ravenswood Goodwill and Assets Held for Sale at December 31, 2016	2.0 times*

The Corporation’s interest obligations for the twelve-month period ended Dec 31, 2016 amounted to approximately $2.231 billion. The Corporation’s earnings before interest expense and income taxes amounted to approximately $2.541 billion for the twelve-month period ended Dec 31, 2016, which is 1.1 times the Corporation’s interest requirements for that period.

* The Corporation’s interest obligations for the twelve-month period ended Dec 31, 2016 amounted to approximately $2.231 billion. The Corporation’s earnings before interest expense and income taxes excluding the non-cash impairment charges for Ravenswood goodwill and Assets Held for Sale at December 31, 2016, of $1.914 billion, amounted to approximately $4.455 billion for the twelve-month period ended Dec 31, 2016, which is 2.0 times the Corporation’s interest requirements for that period.