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Exhibit 4.7

December 2, 2013
VIA SEDAR — PROJECT #02137999
Alberta Securities Commission
Dear Sirs:
- Re:
- TransCanada PipeLines Limited
Final Short Form Base Shelf Prospectus
We refer to the final short form base shelf prospectus dated December 2, 2013 (the "Prospectus") of TransCanada PipeLines Limited (the "Corporation") relating to the offering by the Corporation of up to US$4,000,000,000 aggregate principal amount of debt securities.
We hereby consent to the references to our firm name under the headings "Enforceability of Civil Liabilities", "Interests of Experts", "Legal Matters" and "Documents Filed as Part of the Registration Statement" in the Prospectus and to the use of our opinion under the heading "Enforceability of Civil Liabilities" in the Prospectus.
We confirm that we have read the Prospectus and have no reason to believe that there are any misrepresentations in the information contained in the Prospectus that are derived from our opinion referred to therein or that are within our knowledge as a result of the services we performed in connection with such opinion.
| | |
| | Yours truly, |
| | (signed) "Blake, Cassels & Graydon LLP" |

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