CALGARY, Alberta – May 24, 2018 – News Release – TransCanada Corporation (TSX, NYSE: TRP) (TransCanada) announced today that the National Energy Board (NEB) has recommended the federal government approve a variance to the previously issued North Montney Mainline Project certificate, which would allow construction to start on the proposed $1.4 billion natural gas project in northeast British Columbia.

This brochure contains important safety information about natural gas pipelines, and you participate in excavation related activities near the Portland Natural Gas Transmission

This brochure contains important safety information about natural gas pipelines and TransCanada has a regulatory obligation to communicate this information to stakeholders that live and work near pipelines.

2021 Meter Stations and Laterals Abandonment Program Map

The document listed below in this Section and filed as Exhibit 99.1 to this Form 6-K 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 (Reg. No. 333-121265) under the Securities Act of 1933, as amended.