Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of TransCanada PipeLines Limited

We consent to the use of our report, dated February 14, 2018, with respect to the consolidated financial statements included in this annual report on Form 40-F.

We also consent to the incorporation by reference of such report in TransCanada PipeLines Limited's Registration Statement NO. 333-221898 on Form F-10.

/s/ KPMG LLP

Chartered Professional Accountants

February 16, 2018

Calgary, Canada