TC Pipelines (TCP) 8-K TC PipeLines, LP to Release Fourth Quarter and Year End 2017 Financial Results on February 23

  Exhibit 99.1

NewsRelease                                                                              

TC PipeLines, LP to Release Fourth Quarter andYear End 2017 Financial Results on February 23

HOUSTON, Texas – February 9, 2018 – TC PipeLines, LP (NYSE: TCP) (the Partnership) will release its fourth quarter and year end 2017 financial results on Friday, February 23, 2018. Brandon Anderson, president of the General Partner, will discuss the Partnership's financial results and latest developments in a teleconference and webcast on Friday, February 23 at 10 a.m. (CST) / 11 a.m. (EST).

Analysts, members of the media and other interested parties are invited to participate by calling 800.377.0758. Please dial in 10 minutes prior to the start of the call. No pass code is required. A live webcast will also be available through the Partnership's website at www.tcpipelineslp.com. Slides for the conference call will be posted on the Partnership's website under "Events and Presentations" prior to the webcast.

A replay of the teleconference will also be available two hours after the conclusion of the call and until 11 p.m. (CST) and midnight (EST) on March 2, 2018, by calling 800.408.3053, then entering pass code 3672338#.

About TC PipeLines, LP

TC PipeLines, LP is a Delaware master limited partnership with interests in eight federally regulated U.S. interstate natural gas pipelines which serve markets in the Western, Midwestern and Northeastern United States. The Partnership is managed by its general partner, TC PipeLines GP, Inc., a subsidiary of TransCanada Corporation (NYSE:TRP). For more information about TC PipeLines, LP, visit the Partnership's website at www.tcpipelineslp.com.

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Media Inquiries:

Mark Cooper/Grady Semmens

403.920.7859 or 800.608.7859

Unitholder and Analyst Inquiries:

Rhonda Amundson

877.290.2772

investor_relations@tcpipelineslp.com