Exhibit 5.3
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| Mayer Brown LLP |
| 71 South Wacker Drive |
| Chicago, Illinois 60606-4637 |
May 12, 2015 |
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| Main Tel (312) 782-0600 |
| Main Fax (312) 701-7711 |
| www.mayerbrown.com |
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TransCanada PipeLines Limited |
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TransCanada Trust |
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450 - 1st Street S.W. |
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Calgary, Alberta, Canada, T2P 5H1 |
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Ladies and Gentlemen:
We refer to the prospectus included as part of the registration statement on Form F-10 (Registration No. 333-203859) of TransCanada PipeLines Limited and TransCanada Trust (the “Prospectus”).
We hereby consent to the references to our firm name in the Prospectus on the cover page and under the captions “Legal Matters,” “Interests of Experts” and “Documents Filed as Part of the Registration Statement.”
| Very truly yours, |
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| /s/ Mayer Brown LLP |
| Mayer Brown LLP |
Mayer Brown LLP operates in combination with other Mayer Brown entities with offices in Europe and Asia
and is associated with Tauil & Chequer Advogados, a Brazilian law partnership.