Exhibit 5.4
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| Mayer Brown LLP |
| 71 South Wacker Drive |
| Chicago, Illinois 60606-4637 |
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| Main Tel (312) 782-0600 |
August 5, 2016 | Main Fax (312) 701-7711 |
| www.mayerbrown.com |
TransCanada PipeLines Limited
TransCanada Trust
450 - 1st Street S.W.
Calgary, Alberta, Canada, T2P 5H1
Ladies and Gentlemen:
We hereby consent to the references to this firm under the caption “Legal Matters” in the prospectus included as part of the registration statement on Form F-10 ( Registration No. 333-212720) of TransCanada PipeLines Limited and TransCanada Trust.
| Very truly yours, |
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| /s/ Mayer Brown LLP |
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| Mayer Brown LLP |
Mayer Brown LLP operates in combination with other Mayer Brown entities (the "Mayer Brown Practices"), which have offices in North America, Europe and Asia and are associated with Tauil & Chequer Advogados, a Brazilian law partnership.