6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 under

the Securities Exchange Act of 1934

For the month of September 2019

Commission File Number: 333-203859

TRANSCANADA TRUST

(Translation of Registrant’s Name into English)

450 — 1st Street S.W., Calgary, Alberta, T2P 5H1, Canada
(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F o Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): o

The following documents are hereby filed with the Securities and Exchange Commission for the purpose of being and hereby are incorporated by reference into Registration Statement on Form F-10 (File No. 333-232968) of TransCanada PipeLines Limited and TransCanada Trust:

1.Assignment and Set-Off Agreement, dated as of September 12, 2019, among TransCanada Trust, TransCanada PipeLines Limited, TC Energy Corporation and AST Trust Company (Canada).

2.Share Exchange Agreement, dated as of September 12, 2019, among TransCanada Trust, TransCanada PipeLines Limited and AST Trust Company (Canada).

3.TCPL Subordinated Note Purchase Agreement, dated September 12, 2019, between TransCanada Trust and TransCanada PipeLines Limited.

4.Fifth Supplemental Indenture, dated as of September 12, 2019, between TransCanada PipeLines Limited, TransCanada Trust and AST Trust Company (Canada), as trustee, to the Trust Indenture, dated as of May 20, 2015 between TransCanada Trust and AST Trust Company (Canada) (f/k/a CST Trust Company), as trustee.

5.Fifth Supplemental Indenture, dated as of September 12, 2019, between TransCanada PipeLines Limited and Computershare Trust Company of Canada, as trustee, to the Subordinated Notes Trust Indenture, dated as of May 20, 2015, between TransCanada PipeLines Limited and Computershare Trust Company of Canada.

EXHIBIT INDEX

1.Assignment and Set-Off Agreement, dated as of September 12, 2019, among TransCanada Trust, TransCanada PipeLines Limited, TC Energy Corporation and AST Trust Company (Canada).

2.Share Exchange Agreement, dated as of September 12, 2019, among TransCanada Trust, TransCanada PipeLines Limited and AST Trust Company (Canada).

3.TCPL Subordinated Note Purchase Agreement, dated September 12, 2019, between TransCanada Trust and TransCanada PipeLines Limited.

4.Fifth Supplemental Indenture, dated as of September 12, 2019, between TransCanada PipeLines Limited, TransCanada Trust and AST Trust Company (Canada), as trustee, to the Trust Indenture, dated as of May 20, 2015 between TransCanada Trust and AST Trust Company (Canada) (f/k/a CST Trust Company), as trustee.

5.Fifth Supplemental Indenture, dated as of September 12, 2019, between TransCanada PipeLines Limited and Computershare Trust Company of Canada, as trustee, to the Subordinated Notes Trust Indenture, dated as of May 20, 2015, between TransCanada PipeLines Limited and Computershare Trust Company of Canada.

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Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	TRANSCANADA TRUST, by TRANSCANADA PIPELINES LIMITED, in its capacity as Administrative Agent
Date: September 12, 2019
	By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary

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EX-1

Exhibit 1

TRANSCANADA TRUST

- and -

TRANSCANADA PIPELINES LIMITED

- and -

TC ENERGY CORPORATION

- and -

AST TRUST COMPANY (CANADA)

ASSIGNMENT AND SET-OFF AGREEMENT
Trust Notes - Series 2019-A

Dated as of September 12, 2019

TABLE OF CONTENTS

ARTICLE 1 DEFINITIONS AND INTERPRETATION		2
1.1	Definitions	2
1.2	Additional Definitions	6
1.3	Headings	6
1.4	Extended Meanings	6
1.5	Date of Any Action	6
1.6	Payments	6
1.7	References to Statutes	6
1.8	Currency References	6
1.9	Rights of Set-Off	6
1.10	Schedules	7
ARTICLE 2 TRUST		7
2.1	Establishment of Trust	7
ARTICLE 3 DEFERRAL EVENT SUBSCRIPTION		7
3.1	Creation and Grant of the Deferral Event Subscription	7
3.2	Issuance of TCPL Deferral Preferred Shares	8
3.3	Deferral Dates	8
3.4	TCPL Covenants	8
3.5	TCE Covenants	9
3.6	Ineligible Persons	10
3.7	Assignment, Set-Off and Related Procedures	10
3.8	Delivery Mechanics	12
ARTICLE 4 COVENANTS, REPRESENTATIONS AND WARRANTIES		12
4.1	Certain Representations	12
4.2	Notification of Certain Events	12
4.3	Qualification of TCPL Deferral Preferred Shares	13
4.4	TCPL Support	13
4.5	Capital Reorganizations and Amalgamations of TCPL	14
ARTICLE 5 INDENTURE TRUSTEE		14
5.1	Powers and Duties of Indenture Trustee	14
5.2	No Conflict of Interest	15
5.3	Dealings with Transfer Agents, Registrars and the Clearing Agency	15
5.4	Books and Records	16
5.5	Indemnification Prior to Certain Actions by Indenture Trustee	16
5.6	Actions by Holders	16

5.7	Reliance upon Declarations	16
5.8	Evidence and Authority to Indenture Trustee	17
5.9	Experts, Advisers and Agents	18
5.10	Investment of Money Held by or on behalf of Indenture Trustee	18
5.11	Indenture Trustee Not Required to Give Security	18
5.12	Indenture Trustee Not Bound to Act on Request	19
5.13	Authority to Carry on Business	19
5.14	Conflicting Claims	19
5.15	Acceptance of Bare Trust	20
5.16	Withholding Tax	20
5.17	Residency of Indenture Trustee	20
5.18	Tax Reports	20
5.19	Compliance with Privacy Legislation	21
5.20	Compliance with Anti-Money Laundering Legislation	21
ARTICLE 6 COMPENSATION		21
6.1	Fees and Expenses of Indenture Trustee	21
ARTICLE 7 INDEMNIFICATION AND LIMITATION OF LIABILITY		21
7.1	Indemnification of Indenture Trustee	21
7.2	Limitation of Liability	22
ARTICLE 8 CHANGE OF INDENTURE TRUSTEE		22
8.1	Resignation of Indenture Trustee	22
8.2	Removal of Indenture Trustee	23
8.3	Successor Indenture Trustee	23
8.4	Notice of Successor Indenture Trustee	23
ARTICLE 9 AMENDMENTS AND SUPPLEMENTAL AGREEMENTS		24
9.1	Ministerial Amendments	24
9.2	Meeting to Consider Amendments	24
9.3	Execution of Supplemental Agreements	24
ARTICLE 10 TERMINATION		25
10.1	Term	25
10.2	Survival of Agreement	25
ARTICLE 11 GENERAL		25
11.1	Severability	25
11.2	Enurement	25
11.3	Notices to Parties	25
11.4	Notice to Holders	26

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11.5	Risk of Payments by Post	26
11.6	Counterparts	27
11.7	Jurisdiction	27
11.8	Exclusion of Contractual Liability	27
11.9	Appointment of Administrative Agent	27

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ASSIGNMENT AND SET-OFF AGREEMENT

ASSIGNMENT AND SET-OFF AGREEMENT dated as of September 12, 2019,

AMONG:	TRANSCANADA TRUST (the “Trust”), a unit trust established under the laws of the Province of Ontario, by its administrative agent, TransCanada PipeLines Limited;
AND:	TRANSCANADA PIPELINES LIMITED (“TCPL”), a corporation existing under the laws of Canada;
AND:	TC ENERGY CORPORATION (“TCE”), a corporation existing under the laws of Canada;
AND:	AST TRUST COMPANY (CANADA) (the “Indenture Trustee”), a trust company existing under the laws of Canada;

WHEREAS, the Trust has issued and outstanding voting trust units, all of which are owned by TCPL, U.S.$750,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2015-A due May 20, 2075, U.S.$1,200,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2016-A due August 15, 2076, U.S.$1,500,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2017-A due March 15, 2077, and Cdn.$1,500,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2017-B due May 18, 2077, representing subordinated unsecured debt obligations of the Trust and for which it has also entered into assignment and set-off agreements on substantially the same terms as this Agreement;

WHEREAS, on the date hereof the Trust has issued and outstanding U.S.$1,100,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2019-A due September 15, 2079 (the “Trust Notes — Series 2019-A”);

WHEREAS, TCPL wishes to grant the Deferral Event Subscription on the terms set forth in this Agreement;

WHEREAS, the Indenture Trustee, for and on behalf of the Holders, has been appointed pursuant to the Trust Indenture to irrevocably commit to the Deferral Event Subscription on the terms set forth in this Agreement;

WHEREAS, the parties to this Agreement desire to implement procedures whereby the Trust, TCPL and the Indenture Trustee will take all actions necessary to ensure that the Deferral Event Subscription is given proper effect;

WHEREAS, the parties to this Agreement desire to implement procedures whereby TCPL and TCE will take all actions necessary to ensure that the Dividend Stopper Undertaking is given proper effect; and

WHEREAS, these recitals and any statements of fact in this Agreement are made by TCPL and the Trust and not by the Indenture Trustee;

NOW, THEREFORE, in consideration of the respective covenants and agreements provided in this Agreement and other good and valuable consideration (the receipt and sufficiency of which is hereby acknowledged), the parties agree as follows:

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ARTICLE 1
DEFINITIONS AND INTERPRETATION

1.1Definitions

In this Agreement,

“Administration Agreement” means the agreement between the Trust and TCPL dated September 16, 2014 pursuant to which TCPL, or any successor thereto, serves as administrative agent to the Trust, as amended from time to time.

“Administrative Agent” has the meaning ascribed thereto in the Administration Agreement.

“Affiliate” means, in respect of any Person, any other Person which, directly or indirectly, is in control of, is controlled by or is under common control with such Person; provided that the Trust and TCPL and its Affiliates shall be Affiliates for so long as TCPL and/or its Affiliates hold at least a majority of the voting trust units of the Trust.  For the purposes of this definition, a Person will be deemed to be “controlled by” another Person if such other Person possesses directly, or indirectly, power to direct or cause the direction of the management and policies of such Person, whether by contract or otherwise.

“Agreement” means this Assignment and Set-Off Agreement, including the Schedules, as amended, supplemented or restated from time to time; and the expressions “hereof”, “herein”, “hereto”, “hereunder”, “hereby” and similar expressions refer to this Agreement in its entirety and each schedule, and not to any particular Article, section, subsection or other part of this Agreement.

“Applicable Laws” means the Applicable Laws as defined in Section 4.3.

“Authorized Investments” has the meaning ascribed thereto in the Share Exchange Agreement.

“Automatic Exchange” has the meaning ascribed thereto in the Share Exchange Agreement.

“Automatic Exchange Event” has the meaning ascribed thereto in the Share Exchange Agreement.

“Business Day” means a day on which TCPL, the Trust and the Indenture Trustee are open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

“CBCA” means the Canada Business Corporations Act.

“Clearing Agency” means DTC and/or any other or additional organization that performs securities transfer, settlement, clearing and/or pledge services in relation to the Trust Notes — Series 2019-A or the TCPL Exchange Preferred Shares.

“Closing Date” means September 12, 2019.

“Declaration of Trust” means the Declaration of Trust dated as of September 16, 2014 governing the Trust, as it may be amended, supplemented or restated from time to time.

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“Deferral Date” means an Interest Payment Date in respect of which a Deferral Event has occurred and is continuing.

“Deferral Event” means, in respect of an Interest Payment Date, either a Missed Dividend Deferral Event or an Other Deferral Event.

“Deferral Event Notice” means the notice to be executed by TCPL in the form of Schedule B and delivered to the Indenture Trustee upon the occurrence of a Deferral Event.

“Deferral Event Subscription” means, in respect of a Deferral Event, the agreement created hereby among TCPL, each Holder of Trust Notes — Series 2019-A from time to time and the Indenture Trustee under which (i) subject to Section 3.6, TCPL undertakes to issue and transfer TCPL Deferral Preferred Shares to each Holder of Trust Notes — Series 2019-A who is entitled to receive a payment of interest on the Trust Notes — Series 2019-A on a Deferral Event, in each case in the number calculated in relation thereto in Section 3.3(a), and (ii) such Holder of Trust Notes — Series 2019-A, through the Indenture Trustee acting for and on its behalf, has irrevocably subscribed for and agreed to acquire such TCPL Deferral Preferred Shares for a purchase price equal to the Deferral Event Subscription Proceeds, in each case made and becoming effective at the times, on the basis, in the manner and subject to the terms contemplated in this Agreement.

“Deferral Event Subscription Proceeds” means, in respect of a Deferral Event, the subscription proceeds payable by a Holder of Trust Notes — Series 2019-A to TCPL in connection with a Deferral Event Subscription equal in the aggregate for the Holder to (i) the stated issue price of the applicable series of TCPL Deferral Preferred Shares, times (ii) the number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) to be delivered to or in respect of the Holder (including for greater certainty to the Indenture Trustee if the Holder is an Ineligible Person) as calculated in relation thereto in Section 3.3(a).

“Deferral Event Subscription Proceeds Assignment” has the meaning ascribed thereto in Section 3.7(d).

“Dividend Declaration Resumption Month” means the month following the first day on which, after TCPL Deferral Preferred Shares have been issued, no TCPL Deferral Preferred Shares are outstanding, being the month in which TCPL and TCE may resume declaring dividends on the TCPL Dividend Restricted Shares and TCE Dividend Restricted Shares, respectively.

“Dividend Restricted Period” means the period from and including a Deferral Date to, but excluding, the first day of the applicable Dividend Declaration Resumption Month.

“Dividend Stopper Undertaking” means, collectively, (a) the covenants of TCPL set forth in Section 3.4(a) and (b) of this Agreement and (b) the covenants of TCE set forth in Section 3.5 of this Agreement.

“DTC” means the Depository Trust Company and its nominees or any successors.

“Extraordinary Resolution” means an extraordinary resolution passed in accordance with Article 9 of the Trust Indenture.

“Holders” means the registered holders, whether holding on their own account or on behalf of beneficial owners, from time to time, of Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares, as applicable, or, where the context requires, all of such holders, except that for purposes

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of any withholding tax, Holders shall mean beneficial owners, from time to time, of Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares, as applicable, or, where the context requires, all of such beneficial owners.

“Indenture Trustee” means AST Trust Company (Canada), in its capacity as trustee under the Trust Indenture and as bare trustee and nominee hereunder, and includes any successor trustee as may be appointed from time to time and any permitted assigns thereof.

“Ineligible Person” means any Person whose address is in, or whom TCPL or the Trust or the Transfer Agent has reason to believe is a resident of, any jurisdiction other than Canada or the United States, in each case to the extent that the issuance or delivery by TCPL or the Trust to such Person upon a Deferral Event, of TCPL Deferral Preferred Shares would require TCPL or the Trust to take any action to comply with securities or analogous laws of that other jurisdiction.

“Interest Payment Date” means, prior to and excluding September 15, 2029, March 15 and September 15 (other than September 15, 2019), and starting September 15, 2029, March 15, June 15, September 15 and December 15 of each year during which any Trust Notes — Series 2019-A are outstanding thereafter, until September 15, 2079.

“Interest Period” means, initially, the period from and including the Closing Date to but excluding March 15, 2020 and thereafter from and including each Interest Payment Date to, but excluding, the next following Interest Payment Date.

“Missed Dividend Deferral Event” means the failure of TCPL, other than during a Dividend Restricted Period, to declare cash dividends on TCPL Preferred Shares, if any, consistent with TCPL’s dividend practice in effect from time to time with respect to TCPL Preferred Shares, in each case in the last 90 days preceding the commencement of the Interest Period ending on the day preceding the relevant Interest Payment Date.

“Other Deferral Event” means the election by TCPL, at its sole option, prior to the commencement of the Interest Period ending on the day preceding the relevant Interest Payment Date, that holders of Trust Notes — Series 2019-A apply interest paid on the Trust Notes on the relevant Interest Payment Date to acquire TCPL Deferral Preferred Shares.

“Person” is to be broadly interpreted and includes an individual, a corporation, a limited liability company, an unlimited liability company, a limited or general partnership, a trust, an unincorporated organization, a joint venture and any other organization, whether or not a legal entity, a government of a country or any political subdivision of a country or any agency or department of any such government and the executors, administrators or other legal representatives of a Person in such capacity.

“Privacy Laws” has the meaning ascribed thereto in Section 5.19.

“Series 2019-A Indenture” means the Trust Indenture, as supplemented by the supplemental indenture dated as of the Closing Date between the Trust, the Indenture Trustee and TCPL, providing for, inter alia, the creation and issuance of the Trust Notes — Series 2019-A, as the same may be amended, supplemented or restated from time to time.

“Series 2019-A Trust Estate” means collectively the rights and obligations of the Holders hereunder and pursuant hereto in respect of the Deferral Event Subscription, the Dividend Stopper Undertaking and the covenants of TCPL and TCE contained in this Agreement and all money and

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other rights or assets that may be held from time to time by the Indenture Trustee as bare trustee and nominee pursuant to this Agreement.

“Share Exchange Agreement” means the Share Exchange Agreement dated the date hereof among the Trust, TCPL and the Exchange Trustee, as amended from time to time.

“Tax Act” means the Income Tax Act (Canada).

“TCE” means TC Energy Corporation and its successors and assigns.

“TCE Common Shares” means the common shares of TCE.

“TCE Dividend Restricted Shares” means, collectively, any TCE Preferred Shares or, if no TCE Preferred Shares are then outstanding, the TCE Common Shares.

“TCE Preferred Shares” means collectively all of the preferred shares of TCE.

“TCPL” means TransCanada PipeLines Limited and its successors and assigns.

“TCPL Common Shares” means the common shares of TCPL.

“TCPL Deferral Preferred Share Provisions” means the series rights, privileges, restrictions and conditions attaching to TCPL Deferral Preferred Shares as set forth in Schedule A.

“TCPL Deferral Preferred Shares” means the first preferred shares of TCPL of each series issued to holders of Trust Notes from time to time in connection with the Deferral Event corresponding to such series, each of which series will be separately identified and provide for the TCPL Deferral Preferred Share Provisions subject to the specific terms that relate to such series.

“TCPL Dividend Restricted Shares” means, collectively, any TCPL Preferred Shares or, if no TCPL Preferred Shares are then outstanding, the TCPL Common Shares.

“TCPL Exchange Preferred Shares” means the applicable series of first preferred shares issued by TCPL following an Automatic Exchange under the Share Exchange Agreement.

“TCPL Preferred Shares” means collectively all of the preferred shares of TCPL (including the TCPL Exchange Preferred Shares and TCPL Deferral Preferred Shares).

“TCPL Sub Note — Series 2019-A” means the junior subordinated notes Series 2019-A issued by TCPL to the Trust (in an initial principal amount, on the date hereof, of $1,100,000,000).

“Transfer Agent” means the transfer agent from time to time for TCPL Deferral Preferred Shares.

“Trust Indenture” means the Trust Indenture dated as of the May 20, 2015 and entered into between the Trust and the Indenture Trustee, as it may be amended, supplemented or restated from time to time.

“Trust Notes” means the Trust Notes — Series 2019-A and any other instruments representing subordinated unsecured debt obligations of the Trust as may be issued and outstanding under the Series 2019-A Indenture from time to time.

“Trust Notes - Series 2019-A” has the meaning ascribed thereto in the recitals to this Agreement.

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“Trust Notes — Series 2019-A Provisions” means the rights, privileges, restrictions and conditions attaching to the Trust Notes — Series 2019-A, as set forth in the Series 2019-A Indenture.

“Trustee” means Computershare Trust Company, the trustee of the Trust, and includes any successor to it which may become trustee of the Trust in accordance with Section 7.4 of the Declaration of Trust.

1.2Additional Definitions

In addition, unless the context otherwise requires, the definitions in the Declaration of Trust and the Series 2019-A Indenture apply to this Agreement.

1.3Headings

The division of this Agreement into Articles, Sections and subsections and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this Agreement.

1.4Extended Meanings

In this Agreement words importing the singular number only shall include the plural and vice versa, and words importing gender include all genders.

1.5Date of Any Action

If any date on which any action is required to be taken under this Agreement is not a Business Day, such action will be required to be taken on the next succeeding Business Day.

1.6Payments

All payments to be made hereunder shall be made without interest and less any tax required by law to be deducted and withheld as provided under Section 5.16.

1.7References to Statutes

Unless expressly stated otherwise, a reference to any statute shall be deemed to be a reference to that statute as in force from time to time, including any regulations, rules, policy statements, instruments or guidelines made under that statute, and to include any statute which may be enacted in substitution of that statute.

1.8Currency References

All references to dollar ($) amounts shall, unless otherwise expressly indicated herein, be to United States dollars.

1.9Rights of Set-Off

Each party may set-off against amounts owing by it hereunder to another Person any amounts owing or accruing due by such Person to it or any of its Affiliates, without duplication.

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1.10Schedules

The following Schedules form an integral part of this Agreement:

Schedule A	-	TCPL Deferral Preferred Share Provisions; and
Schedule B	-	Deferral Event Notice

ARTICLE 2
TRUST

2.1Establishment of Trust

The Indenture Trustee shall hold the Series 2019-A Trust Estate as bare trustee and nominee in order to enable the Indenture Trustee to exercise the rights and enforce the obligations thereunder, and shall hold the other rights granted in or resulting from the Indenture Trustee being a party to this Agreement in order to enable the Indenture Trustee to exercise or enforce such rights, in each case as bare trustee and nominee for and on behalf of the Holders of Trust Notes — Series 2019-A, as provided in this Agreement.  Except where the context otherwise requires, all references to the Indenture Trustee hereunder shall be to the Indenture Trustee in its capacity as bare trustee and nominee for and on behalf of the Holders of Trust Notes — Series 2019-A.

ARTICLE 3
DEFERRAL EVENT SUBSCRIPTION

3.1Creation and Grant of the Deferral Event Subscription

(a)TCPL hereby grants the Deferral Event Subscription together with its undertaking to, and covenants in favour of, the Indenture Trustee, as bare trustee and nominee for and on behalf of, and for the use and benefit of, the Holders of Trust Notes — Series 2019-A, to give effect to the Deferral Event Subscription in accordance with and subject to the Trust Notes — Series 2019-A Provisions and the provisions of this Agreement. TCPL hereby acknowledges receipt from the Indenture Trustee, as bare trustee and nominee for and on behalf of the Holders of Trust Notes — Series 2019-A, of good and valuable consideration for such grant and covenant and the sufficiency thereof.

(b)The Indenture Trustee, for and on behalf of the Holders of Trust Notes — Series 2019-A, hereby grants its undertaking to, and covenants in favour of, TCPL to give effect to the Deferral Event Subscription in accordance with and subject to the Trust Notes — Series 2019-A Provisions and the provisions of this Agreement. The Indenture Trustee, for and on behalf of the Holders of Trust Notes — Series 2019-A, hereby acknowledges receipt from TCPL of good and valuable consideration for such grant and covenant and the sufficiency thereof.

(c)During the term of the trust created under this Agreement and subject to the terms and conditions of the Trust Notes — Series 2019-A Provisions and this Agreement, the Indenture Trustee shall possess and be vested with full legal right, entitlement and ownership to the rights arising from TCPL’s grant and covenant under Section 3.1(a) and the full power and authority of the Holders pursuant to and in accordance with the Trust Notes — Series 2019-A Provisions to perform the undertaking and covenant under Section 3.1(b).  The Indenture Trustee shall be entitled to exercise all of the related rights, privileges and powers of, under and with respect to the grant and covenant under Section 3.1(a), and to give effect to and

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perform the grant and covenant under Section 3.1(b), provided that the Indenture Trustee shall:

(i)hold the Deferral Event Subscription rights and the legal title thereto as bare trustee and nominee for and solely for the use and benefit of the Holders of Trust Notes — Series 2019-A and TCPL in accordance with and subject to the Trust Notes — Series 2019-A Provisions and this Agreement;

(ii)give effect to the Deferral Event Subscription in compliance with and subject to the Trust Notes — Series 2019-A Provisions and this Agreement; and

(iii)except as specifically authorized by this Agreement, have no power or authority to exercise or otherwise deal in or with the Deferral Event Subscription rights, and the Indenture Trustee shall not exercise any related rights for any purpose, in each case other than pursuant to this Agreement.

3.2Issuance of TCPL Deferral Preferred Shares

(a)A new series of TCPL Deferral Preferred Shares shall be issued by TCPL in respect of each Deferral Date.

(b)TCPL shall not at any time issue TCPL Deferral Preferred Shares except in accordance with the Series 2019-A Indenture.

3.3Deferral Dates

(a)On each Deferral Date, interest payable on the Trust Notes — Series 2019-A on such Deferral Date to a particular Holder of Trust Notes — Series 2019-A shall be applied on behalf of holders of Trust Notes — Series 2019-A to acquire a new series of TCPL Deferral Preferred Shares, at a stated issue price of $1,000 per share, in accordance with the assignment and set-off procedures set forth in Section 3.7 hereof.  A new series of TCPL Deferral Preferred Shares shall be issued by TCPL in respect of each Deferral Date.  The number of applicable TCPL Deferral Preferred Shares (including fractional shares, if applicable) subscribed for by a Holder of Trust Notes — Series 2019-A shall equal (i) the amount of the interest payment on the Trust Notes — Series 2019-A that has not been paid in cash to such Holder on the Deferral Date, divided by (ii) the stated issue price of the applicable series of TCPL Deferral Preferred Shares.

(b)Whether or not a Deferral Event has occurred in respect of a particular Interest Payment Date shall be determined by TCPL in accordance with Section 3.7 prior to the commencement of the Interest Period ending on the day immediately preceding such Interest Payment Date.  There shall be no limit on the number of times that Deferral Events may occur.

3.4TCPL Covenants

So long as any Trust Notes — Series 2019-A are outstanding and are held by any Person other than TCPL or its Affiliates, TCPL covenants as follows for the benefit of the Holders of Trust Notes — Series 2019-A:

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(a)if a Deferral Event has occurred and is continuing, TCPL shall not, during the applicable Dividend Restricted Period, declare dividends of any kind on any of the TCPL Dividend Restricted Shares;

(b)if a Deferral Event has occurred and is continuing, TCPL shall not make, and shall ensure that no subsidiary of TCPL makes, in each case during the applicable Dividend Restricted Period, any payment to holders of TCPL Dividend Restricted Shares in respect of dividends not declared or paid by TCPL (other than, for greater certainty, accrued and unpaid dividends on TCPL Deferral Preferred Shares that are redeemed) and TCPL shall not redeem any TCPL Dividend Restricted Shares other than TCPL Deferral Preferred Shares (which, for greater certainty, may be redeemed), and shall not, and shall ensure that no subsidiary shall, in each case during the applicable Dividend Restricted Period, purchase any TCPL Dividend Restricted Shares;

(c)TCPL shall not create or issue any preferred shares of TCPL which, in the event of insolvency or winding-up of TCPL, would rank in right of payment in priority to the TCPL Deferral Preferred Shares;

(d)prior to the issuance of any TCPL Deferral Preferred Shares in respect of a Deferral Event, TCPL shall not, without the prior approval of Holders of Trust Notes — Series 2019-A by Extraordinary Resolution, amend, delete or vary any of the rights, privileges, restrictions and conditions attaching to the TCPL Deferral Preferred Shares other than amendments, deletions or variations which do not negatively impact future holders of TCPL Deferral Preferred Shares and other than amendments that relate to the preferred shares of TCPL as a class; and

(e)TCPL shall not assign or otherwise transfer its obligations under this Agreement, except in the case of a merger, consolidation, amalgamation or reorganization or sale of substantially all of the assets of TCPL.

3.5TCE Covenants

So long as any Trust Notes — Series 2019-A are outstanding and are held by any Person other than TCE, TCPL or their Affiliates, TCE covenants as follows for the benefit of the Holders of Trust Notes — Series 2019-A:

(a)if a Deferral Event has occurred and is continuing, TCE shall not, during the applicable Dividend Restricted Period, declare dividends of any kind on any of the TCE Dividend Restricted Shares; and

(b)if a Deferral Event has occurred and is continuing, TCE shall not make, and shall ensure that no subsidiary of TCE makes, in each case during the applicable Dividend Restricted Period, any payment to holders of TCE Dividend Restricted Shares or TCPL Dividend Restricted Shares in respect of dividends not declared or paid on such shares (other than, for greater certainty, accrued and unpaid dividends on TCPL Deferral Preferred Shares that are redeemed) and TCE shall not redeem any TCE Dividend Restricted Shares and shall not, and shall ensure that no subsidiary of TCE shall, in each case during the applicable Dividend Restricted Period, purchase any TCE Dividend Restricted Shares or TCPL Dividend Restricted Shares.

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3.6Ineligible Persons

As set out in the Series 2019-A Indenture, upon a Deferral Event, TCPL reserves the right not to issue TCPL Deferral Preferred Shares to any Ineligible Person.  In those circumstances, TCPL will issue to the Indenture Trustee, and the Indenture Trustee will hold, all TCPL Deferral Preferred Shares that would otherwise be delivered to Ineligible Persons, and the Indenture Trustee will deliver such shares to a broker retained by TCPL for the purpose of effecting the sale (to Persons other than TCPL, its Affiliates and other Ineligible Persons) of such shares on behalf of such Ineligible Persons.  Such sales, if any, may be made at any time and at any price and none of the Trust, the Indenture Trustee or TCPL will be subject to any liability for failing to sell such TCPL Deferral Preferred Shares on behalf of any such Ineligible Persons or at any particular price on any particular day.  The net proceeds received by the Indenture Trustee from the sale of any such TCPL Deferral Preferred Shares will be divided among the Ineligible Persons in proportion to the number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) that would otherwise have been delivered to them, after deducting the costs of sale and any applicable withholding taxes.  The Indenture Trustee shall make payment of the aggregate net proceeds to the Clearing Agency (if the Trust Notes — Series 2019-A are then held in the Book-Entry System) or to the registrar and transfer agent (in all other cases) for distribution to such Ineligible Persons in accordance with customary practices and procedures of the Clearing Agency, or otherwise.

3.7Assignment, Set-Off and Related Procedures

In connection with the occurrence of any Deferral Event, and in respect of the related Deferral Date, the following provisions shall apply:

(a)TCPL shall notify the Indenture Trustee and the Trust at least 5 Business Days prior to the Interest Payment Date on which the Deferral Event will or is expected to occur and be continuing;

(b)the Trust shall calculate the sum of all of the Deferral Event Subscription Proceeds in respect of each related Deferral Event Subscription for all Holders of Trust Notes — Series 2019-A (for greater certainty, regardless of whether they are Ineligible Persons as of the Deferral Date), and the Trust shall advise the Indenture Trustee of such aggregate amount;

(c)as a precondition to the delivery of any certificate or other evidence of issuance representing any TCPL Deferral Preferred Shares or related rights following a Deferral Event, TCPL may require the Trust to obtain from any Holder of Trust Notes — Series 2019-A (and persons holding Trust Notes — Series 2019-A represented by such Holder of Trust Notes — Series 2019-A) a declaration, in form and substance satisfactory to TCPL, confirming compliance with any applicable regulatory requirements to establish that such Holder of Trust Notes — Series 2019-A is not, and does not represent, an Ineligible Person;

(d)TCPL hereby assigns, transfers and conveys to the Trust all of its right, title and interest in the Deferral Event Subscription Proceeds in respect of such Deferral Date payable to TCPL in connection with the Deferral Event Subscription in respect of such Deferral Date (the “Deferral Event Subscription Proceeds Assignment”);

(e)the interest payable to the Trust by TCPL on such Deferral Date pursuant to the TCPL Sub Note — Series 2019-A shall be and be deemed to have been satisfied to the extent of an amount equal to the aggregate Deferral Event Subscription Proceeds payable by the Holders of Trust Notes — Series 2019-A in connection with the TCPL Deferral Preferred Shares to be issued on such Deferral Date pursuant to the Deferral Event Subscription

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Proceeds Assignment and TCPL shall only be required to pay cash to the Trust in an amount equal to the excess of the interest payable by TCPL pursuant to the TCPL Sub Note — Series 2019-A on such Deferral Date over the amount of such Deferral Event Subscription Proceeds;

(f)the Indenture Trustee, on behalf of Holders of Trust Notes — Series 2019-A, hereby agrees, without any further action being required by the Holders of Trust Notes — Series 2019-A, the Trust or TCPL, that the right of the Holders of Trust Notes — Series 2019-A to receive interest thereon in respect of such Deferral Date shall automatically be set off against the obligation of the Holders of Trust Notes — Series 2019-A to pay the cash subscription price for the Deferral Preferred Shares to the Trust corresponding to the applicable Deferral Event Subscription Proceeds, and the Holders of Trust Notes — Series 2019-A shall not be required to pay such subscription prices in cash; and

(g)for greater certainty, the parties agree that on each Deferral Date the application and effect of paragraphs (d), (e) and (f) of this Section 3.7 shall, for all purposes, constitute the satisfaction in full to the extent contemplated of the following obligations following the occurrence of a Deferral Event: (i) TCPL’s obligation to make the payments to the Trust under the TCPL Sub Note — Series 2019-A in accordance with the terms thereof in respect of such Deferral Date; (ii) the Trust’s obligation to pay interest payable on the Trust Notes — Series 2019-A to the Indenture Trustee as bare trustee for and on behalf of the Holders of the Trust Notes — Series 2019-A in respect of such Deferral Date; (iii) the Indenture Trustee’s obligation as bare trustee for and on behalf of the Holders of the Trust Notes — Series 2019-A to pay the interest received from the Trust to the Holders of the Trust Notes — Series 2019-A in respect of such Deferral Date; (iv) the Indenture Trustee’s obligation to exercise as bare trustee for and on behalf of the Holders of the Trust Notes — Series 2019-A the Deferral Event Subscription right and acquire as bare trustee for and on behalf of the Holders of the Trust Notes — Series 2019-A the TCPL Deferral Preferred Shares in respect of such Deferral Date; and (v) acknowledged receipt from TCPL that the TCPL Deferral Preferred Shares issuable pursuant to the Deferral Event Subscription have been fully paid for; provided, however, that TCPL’s obligation to issue the TCPL Deferral Preferred Shares to the Holders of the Trust Notes — Series 2019-A shall not be satisfied in full until such time as TCPL has issued such TCPL Deferral Preferred Shares to the Holders of Trust Notes — Series 2019-A in accordance with the terms hereof.

(h)TCPL shall promptly create, issue and (subject to Section 4.3) distribute such number of TCPL Deferral Preferred Shares (including fractional shares, if applicable), with a stated issue price of $1,000 per share, as are issuable pursuant to the Deferral Event Subscription;

(i)TCPL shall transfer and deliver to each Holder of Trust Notes — Series 2019-A who has not been identified by the Trust as an Ineligible Person pursuant to paragraph (c), from among the TCPL Deferral Preferred Shares issued in accordance with paragraph (h), a number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) calculated in respect of the Holder by dividing (x) the interest amount payable in respect of such Holder’s Trust Notes — Series 2019-A on the applicable Deferral Date, by (y) the stated issue amount of the Deferral Preferred Share issued by TCPL; and

(j)TCPL shall transfer and deliver to the Indenture Trustee, in respect of each Holder of Trust Notes — Series 2019-A who has been identified by the Trust as an Ineligible Person pursuant to paragraph (c), from among the TCPL Deferral Preferred Shares issued in accordance with clause (h), a number of TCPL Deferral Preferred Shares (including

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fractional shares, if applicable) calculated in respect of the Holder by dividing (x) the interest amount payable in respect of such Holder’s Trust Notes — Series 2019-A on the applicable Deferral Date, by (y) the stated issue amount of the Deferral Preferred Share issued by TCPL, and the Indenture Trustee shall sell such Deferral Preferred Shares and distribute the net proceeds thereof as contemplated in Section 3.6.

This Section 3.7 shall constitute the irrevocable and unconditional authority, consent and direction by each Holder of the Trust Notes — Series 2019-A to the Indenture Trustee to agree to the provisions contained in this Section 3.7 and shall constitute good and sufficient authority for the Indenture Trustee to act in accordance herewith without any requirement for notice or further action on the part of any such Holder.

3.8Delivery Mechanics

Promptly upon the occurrence of a Deferral Event, TCPL shall provide the Trustee with an executed Deferral Event Notice.  On the Deferral Date to which the Deferral Event Notice relates, TCPL shall issue the aggregate number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) upon payment of the subscription price in accordance with Section 3.7. If the Trust Notes — Series 2019-A are then held in the Book-Entry System of the Clearing Agency, TCPL shall deliver to the Clearing Agency a global certificate representing the TCPL Deferral Preferred Shares, registered in the name of the Clearing Agency or its designated nominee as the Clearing Agency may direct for credit to the accounts of participants in the Clearing Agency’s Book-Entry System holding Trust Notes — Series 2019-A, as at the Deferral Date in respect of which the Deferral Event Notice was delivered, in accordance with their respective interests therein.  In the event that the Trust Notes — Series 2019-A are then held in definitive registered form through physical certificates, TCPL shall promptly arrange for delivery to those Persons who were Holders of Trust Notes — Series 2019-A as at the close of business on the relevant Deferral Date of physical certificates representing the requisite number of such TCPL Deferral Preferred Shares at the last address of such Holders as shown on the register for the Trust Notes - Series 2019-A.

ARTICLE 4
COVENANTS, REPRESENTATIONS AND WARRANTIES

4.1Certain Representations

TCPL hereby represents, warrants and covenants that it has: (i) authorized for issuance and will, at all times, keep available, free from pre-emptive and other rights, out of its authorized and unissued share capital, such number of TCPL Deferral Preferred Shares as may be required to enable TCPL to meet its obligations hereunder; and (ii) taken all necessary corporate action to enable TCPL to issue TCPL Deferral Preferred Shares in connection with the Deferral Events.

4.2Notification of Certain Events

In order to assist TCPL and the Indenture Trustee to comply with their respective obligations hereunder, the Trust shall give TCPL and the Indenture Trustee notice of each of the following events at the times set forth below:

(a)any determination by the Trust to institute voluntary termination proceedings with respect to the Trust or to effect any other distribution of the assets of the Trust among its security holders for the purpose of winding-up its affairs, at least 60 days prior to the proposed effective date of such termination;

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(b)immediately, upon the earlier of: (i) receipt by the Trust of notice of; and (ii) the Trust otherwise becoming aware of, any threatened or instituted claim, suit, petition or other proceedings with respect to the involuntary termination of the Trust or to effect any other distribution of the assets of the Trust among its security holders for the purpose of winding-up its affairs;

(c)immediately upon any failure by the Trust to pay all or any part of the interest on the Trust Notes — Series 2019-A on any Interest Payment Date; and

(d)immediately upon the Trust making any determination to exercise any rights to redeem Trust Notes — Series 2019-A.

4.3Qualification of TCPL Deferral Preferred Shares

TCPL covenants that if any TCPL Deferral Preferred Shares to be issued and delivered hereunder or pursuant to the TCPL Deferral Preferred Share Provisions or the Trust Notes — Series 2019-A Provisions require registration or qualification with or approval of or the filing of any document, including any prospectus or similar document, or the taking of any proceeding with or the obtaining of any order, ruling, approval or consent from any governmental or regulatory authority under any Canadian or United States federal or provincial or state, as applicable, law or regulation or pursuant to the rules and regulations of any Canadian or United States regulatory authority or the fulfilment of any other legal requirement (collectively, the “Applicable Laws”) before such TCPL Deferral Preferred Shares may be issued and delivered by TCPL to the Holders in connection with a Deferral Event, or in order that such TCPL Deferral Preferred Shares may be freely traded thereafter (except for any restrictions on ownership or transfer by reason of any Holder of TCPL Deferral Preferred Shares being a “control person” of TCPL for purposes of Canadian securities laws or by reason of any TCPL Deferral Preferred Shares being “control securities” for the purposes of United States securities laws), TCPL shall, in good faith, expeditiously take all such actions and do all such things as are necessary to cause such TCPL Deferral Preferred Shares to be duly registered, qualified or approved as and to the extent required for such purpose pursuant to Applicable Laws. TCPL represents and warrants that it has taken all actions and done all things as are necessary under Applicable Laws as they exist on the date hereof to cause the TCPL Deferral Preferred Shares to be issued and delivered in accordance with the provisions of this Agreement, the TCPL Deferral Preferred Share Provisions and the Trust Notes — Series 2019-A Provisions and to be freely tradable thereafter by the initial holder thereof, subject to the exceptions referred to above in this Section 4.3; provided, however, that a failure to take such actions or to do such things shall not affect, reduce or modify in any way the effectiveness of the Deferral Event Subscription as of the Deferral Date.

4.4TCPL Support

So long as any Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares are outstanding, TCPL shall perform all of the obligations to be performed by it hereunder in connection with the TCPL Deferral Preferred Share Provisions and the Deferral Event Subscription, as applicable, and shall exercise all of its rights with respect thereto in accordance with the Declaration of Trust, the Trust Indenture and the terms of this Agreement. All TCPL Deferral Preferred Shares issued to Holders of Trust Notes — Series 2019-A, pursuant to the Deferral Event Subscription shall be duly issued as fully paid and non-assessable shares in the capital of TCPL, free of pre-emptive rights and shall be free and clear of any lien, claim, encumbrance, security interest or adverse claim. Without limiting the generality of the immediately preceding sentence, TCPL covenants that it shall, in a timely manner, transfer or arrange to transfer to such account in the Book-Entry System as the Indenture Trustee may direct, from time to time, the appropriate number of TCPL Deferral Preferred Shares (including fractional shares, if applicable), and supply the Indenture Trustee with duly executed share certificates, as applicable, so as to enable the exercise, from

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time to time, of the Deferral Event Subscription or the TCPL Deferral Preferred Share Provisions, as the case may be, in accordance with the Trust Notes — Series 2019-A Provisions, the TCPL Deferral Preferred Share Provisions and the provisions of this Agreement.

4.5Capital Reorganizations and Amalgamations of TCPL

In the event of a capital reorganization, consolidation, merger or amalgamation or sale of substantially all of the assets of TCPL or comparable transaction affecting the TCPL Deferral Preferred Shares, TCPL covenants to take all necessary action to ensure that the Indenture Trustee or Holders of Trust Notes — Series 2019-A, as the case may be, receive, pursuant to the Deferral Event Subscription, after such capital reorganization, consolidation, merger, amalgamation, sale of substantially all assets or comparable transaction, the number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) or other securities or consideration of TCPL or an entity resulting, surviving or continuing from the capital reorganization, consolidation, merger, amalgamation, sale of substantially all assets or comparable transaction that the Indenture Trustee or such Holders of Trust Notes — Series 2019-A would have received if the Deferral Event occurred immediately prior to the record date of the capital reorganization, consolidation, merger, amalgamation, sale of substantially all assets or comparable transaction.

ARTICLE 5
INDENTURE TRUSTEE

5.1Powers and Duties of Indenture Trustee

In addition to and without limiting the Trust Indenture, the rights, powers, duties and authorities of the Indenture Trustee under this Agreement, in its capacity as Indenture Trustee, are as follows:

(a)receiving and holding each Deferral Event Subscription and TCPL’s undertaking and covenant in relation to each Deferral Event Subscription as bare trustee and nominee and effecting the Holders’ undertaking and covenant in relation to each Deferral Event Subscription for and on behalf of each applicable Holder, in each case in accordance with the provisions of this Agreement;

(b)acting for and on behalf of the Holders of Trust Notes — Series 2019-A to implement and give effect to the undertaking and covenant of the Holders with respect to the Deferral Event Subscription;

(c)enforcing the benefit of and giving effect to the Deferral Event Subscription rights in accordance with the Trust Notes — Series 2019-A Provisions and this Agreement and, in connection therewith, distributing or causing to be distributed to the applicable Holders TCPL Deferral Preferred Shares and cheques, if any, to which such Holders may become entitled hereunder in connection with a Deferral Event;

(d)holding and administering the Series 2019-A Trust Estate in accordance with the terms of this Agreement;

(e)investing any money forming, from time to time, part of the Series 2019-A Trust Estate as provided in this Agreement;

(f)subject to this Article 5, taking action at the direction of any Holder to enforce the obligations of the Trust or TCPL under this Agreement; and

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(g)taking such other actions and doing such other things as are specifically provided for in this Agreement.

In the exercise of such rights, powers, duties and authorities, the Indenture Trustee shall have (and is granted) such incidental and additional rights, powers and authority not in conflict with any of the provisions of this Agreement, the Trust Notes — Series 2019-A Provisions and the TCPL Deferral Preferred Share Provisions relating to the Indenture Trustee as are reasonably required for the Indenture Trustee to carry out its duties under this Agreement. Any exercise of such discretionary rights, powers and authorities by the Indenture Trustee shall be final, conclusive and binding upon all Persons. For greater certainty, with respect to the Trust Notes — Series 2019-A and the TCPL Deferral Preferred Shares, the Indenture Trustee shall have only those duties as are set out specifically in this Agreement. The Indenture Trustee, in exercising its rights, powers, duties and authorities hereunder, shall act honestly and in good faith with a view to the best interests of the Holders and shall exercise the care, diligence and skill that a reasonably prudent trustee, nominee and agent would exercise in comparable circumstances. The Indenture Trustee shall not be bound to give any notice or do or take any act, action or proceeding by virtue of the powers conferred on it hereby unless and until it shall be specifically required to do so under the terms hereof; nor shall the Indenture Trustee be required to take any notice of, or to do or to take any act, action or proceeding as a result of any default or breach of any provision hereunder, unless and until notified in writing of such default or breach, which notice shall specify the default or breach desired to be brought to the attention of the Indenture Trustee and in the absence of such notice the Indenture Trustee may for all purposes of this Agreement conclusively assume that no default or breach has been made in the observance or performance of any of the representations, warranties, covenants, agreements or conditions contained in this Agreement.

5.2No Conflict of Interest

The Indenture Trustee represents to the Trust and TCPL that, at the date of execution and delivery of this Agreement, there exists no material conflict of interest in the role of the Indenture Trustee as a fiduciary hereunder. The Indenture Trustee shall, within 90 days after it becomes aware that such a material conflict of interest exists, either eliminate such material conflict of interest or resign in the manner and with the effect specified in Article 8. If, notwithstanding the foregoing provisions of this Section 5.2, the Indenture Trustee has such a material conflict of interest, the validity and enforceability of this Agreement shall not be affected in any manner whatsoever by reason only of the existence of such material conflict of interest. If the Indenture Trustee contravenes the foregoing provisions of this Section 5.2, any interested party may apply to the Superior Court of Justice (Ontario) for an order that the Indenture Trustee be replaced as bare trustee and nominee under this Agreement.

5.3Dealings with Transfer Agents, Registrars and the Clearing Agency

In addition to and without limiting the Trust Indenture, the Trust and TCPL severally and irrevocably authorize the Indenture Trustee, from time to time, to:

(a)consult, communicate and otherwise deal with the Trustee and the respective registrars and transfer agents, and any such subsequent registrar or transfer agent, of the Trust Notes — Series 2019-A and TCPL Deferral Preferred Shares;

(b)if applicable, consult, communicate and otherwise deal with the Clearing Agency; and

(c)requisition, from time to time, from such registrar or transfer agent or the Clearing Agency any information readily available from the records maintained by any such entity which the Indenture Trustee may reasonably require for the discharge of its duties and

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responsibilities under the Trust Notes — Series 2019-A Provisions, the TCPL Deferral Preferred Share Provisions and this Agreement.

5.4Books and Records

The Indenture Trustee shall keep available for inspection by TCPL and the Trust, at the Indenture Trustee’s principal office in Calgary, Alberta, correct and complete books and records of account relating to the Indenture Trustee’s actions under this Agreement. On or before March 1 in every year, the Indenture Trustee shall transmit to TCPL and the Trust a brief report, dated as of December 31 in the immediately preceding year, with respect to: (i) the Series 2019-A Trust Estate as of that date; and (ii) all other actions taken by the Indenture Trustee in the performance of its duties under this Agreement which it had not previously reported.

5.5Indemnification Prior to Certain Actions by Indenture Trustee

Notwithstanding any other provision of this Agreement, and in addition to and without limiting the Trust Indenture, the Indenture Trustee shall only be required to exercise any or all of the rights, duties, powers or authorities vested in it by this Agreement at the written request, order or direction of any Holder upon such Holder furnishing to the Indenture Trustee reasonable funds, security and indemnity satisfactory to the Indenture Trustee, acting reasonably, against the costs, expenses and liabilities that may be incurred by the Indenture Trustee therein or thereby, provided that no Holder will be obligated to furnish to the Indenture Trustee any such funding, security or indemnity in connection with the exercise, but not the enforcement, by the Indenture Trustee of any of its rights, duties, powers and authorities vested in it by this Agreement. None of the provisions contained in this Agreement shall require the Indenture Trustee to expend or risk its own funds or otherwise incur financial liability in the exercise of any of its rights, powers, duties or authorities under this Agreement nor limits the Indenture Trustee, acting reasonably, from requesting an indemnity, before any exercise or enforcement of rights.  In addition, the Indenture Trustee shall disburse funds only to the extent that funds have been deposited with it.

5.6Actions by Holders

No Holder shall have the right to institute any action, suit or proceeding or to exercise any other remedy authorized by this Agreement for the purpose of enforcing any of its rights or for the execution of any trust, power or obligation hereunder unless the Holder has requested in writing the Indenture Trustee to take or institute such action, suit or proceeding and, subject to Section 5.5, furnished the Indenture Trustee with the funding, security and indemnity referred to in Section 5.5, and the Indenture Trustee shall have failed to act within a reasonable time thereafter. In such case, but not otherwise, the Holder shall be entitled to take proceedings in any court of competent jurisdiction, it being understood and intended that no one or more Holders shall have any right in any manner whatsoever to affect, disturb or prejudice the rights hereby created by any such action, or to enforce any right hereunder, except subject to the conditions and in the manner herein provided, and that all powers and trusts hereunder shall be exercised and all proceedings at law shall be instituted, had and maintained by the Indenture Trustee, except only as herein provided, and in any event for the benefit of all Holders.

5.7Reliance upon Declarations

Without limiting the Trust Indenture, the Indenture Trustee shall not be considered to be in contravention of any of its rights, powers, duties and authorities hereunder if, when required, it acts and relies in good faith upon written notices, statutory declarations, certificates, opinions, reports or other papers or documents furnished pursuant to the provisions hereof, the Trust Notes — Series 2019-A Provisions or the TCPL Deferral Preferred Share Provisions or required by the Indenture Trustee to be furnished to it in

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the exercise of its rights, powers, duties and authorities hereunder and such notices, statutory declarations, certificates, opinions, reports or other papers or documents comply with this Agreement, nor shall the Indenture Trustee be responsible for relying on the accuracy of the information contained in any such document provided it honestly and in good faith believes such information to be correct. The Indenture Trustee shall not be responsible or liable in any manner for the sufficiency, genuineness, correctness or validity of any security deposited with it.

5.8Evidence and Authority to Indenture Trustee

Without limiting the Trust Indenture, the Trust and/or TCPL shall furnish to the Indenture Trustee evidence of compliance with the conditions provided for in this Agreement relating to any action or step required or permitted to be taken by the Trust and/or TCPL or the Indenture Trustee under this Agreement, the Trust Notes — Series 2019-A Provisions, the TCPL Deferral Preferred Share Provisions or as a result of any obligation or duty imposed under this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Deferral Preferred Share Provisions, including in respect of the Deferral Event Subscription and the taking of any other action to be taken by the Indenture Trustee, at the request of or on the application of the Trust and/or TCPL forthwith if and when:

(a)such evidence is required by any other provision of this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Deferral Preferred Share Provisions to be furnished to the Indenture Trustee in accordance with this Section 5.8; or

(b)the Indenture Trustee, in the exercise of its rights, powers, duties and authorities under this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Deferral Preferred Share Provisions, gives the Trust and/or TCPL written notice requiring it to furnish such evidence in relation to any particular action or obligation specified in such notice.

Such evidence shall consist of a certificate signed by TCPL and/or by or on behalf of the Trust by an authorized signatory of the Administrative Agent or a statutory declaration stating that any such condition has been complied with in accordance with the terms of this Agreement and the Trust Notes — Series 2019-A Provisions or the TCPL Deferral Preferred Share Provisions, as applicable. Such evidence may consist of a report or opinion of any solicitor, auditor, accountant, appraiser, valuator or other expert or any other Person whose qualifications give authority to a statement made by such Person, provided that if such report or opinion is furnished by TCPL and/or by or on behalf of the Trust by an authorized signatory of the Administrative Agent it shall be in the form of a certificate or a statutory declaration. Each statutory declaration, certificate, opinion or report furnished to the Indenture Trustee as evidence of compliance with a condition provided for in this Agreement, the Trust Notes — Series 2019-A Provisions or TCPL Deferral Preferred Share Provisions, as applicable, shall include a statement by the Person giving the evidence:

(c)declaring that such Person has read and understands the provisions of this Agreement, the Trust Notes — Series 2019-A Provisions and/or the TCPL Deferral Preferred Share Provisions, as applicable, relating to the condition in question;

(d)describing the nature and scope of the examination or investigation upon which such Person based the statutory declaration, certificate, statement or opinion; and

(e)declaring that such Person has made such examination or investigation as such Person believes is necessary to enable such Person to make the statements or give the opinions contained or expressed therein.

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5.9Experts, Advisers and Agents

In addition to and without limiting the Trust Indenture, the Indenture Trustee may:

(a)in relation to this Agreement, the Trust Notes — Series 2019-A Provisions and/or the TCPL Deferral Preferred Share Provisions, act and rely on the opinion or advice of, or information obtained from or prepared by, any solicitor, auditor, accountant, appraiser, valuator or other expert, whether retained by the Indenture Trustee or by the Trust and/or TCPL or otherwise, and may retain or employ such assistants as may be necessary to the proper determination and discharge of its powers, duties and obligations and the determination of its rights hereunder and may pay proper and reasonable compensation for all such legal and other advice or assistance as aforesaid; and

(b)retain or employ such agents and other assistants as it may reasonably require for the proper determination and discharge of its powers and duties hereunder, and may pay reasonable remuneration for all services performed for it (and shall be entitled to receive reasonable remuneration for all services performed by it) in the discharge of its duties hereunder and compensation for all disbursements, costs and expenses made or incurred by it in the determination and discharge of its duties hereunder.

5.10Investment of Money Held by or on behalf of Indenture Trustee

(a)Unless otherwise provided in this Agreement, any moneys held by or on behalf of the Indenture Trustee, which under the terms of this Agreement may or ought to be invested or which may be on deposit with the Indenture Trustee or which may be in the hands of the Indenture Trustee, may be invested and reinvested in the name or under the control of the Indenture Trustee, upon the written direction of the Trust, in Authorized Investments.

(b)Upon receipt of a direction from the Trust, the Indenture Trustee shall invest any moneys held by it in Authorized Investments in its name in accordance with such direction. Any direction from the Trust to the Indenture Trustee shall be in writing and shall be provided to the Indenture Trustee no later than 9:00 a.m. (Toronto time) on the day on which the investment is to be made. Any such direction received by the Indenture Trustee after 9:00 a.m. (Toronto time) or received on a non-Business Day shall be deemed to have been given prior to 9:00 a.m. (Toronto time) on the next Business Day.

(c)In the event that the Indenture Trustee does not receive a direction or only a partial direction, the Indenture Trustee may hold cash balances constituting part or all of the funds and may, but need not, invest same in the deposits of a Canadian chartered bank; but the Indenture Trustee and its Affiliates shall not be liable to account for any profit to any parties to this Agreement or to any Person other than at a rate, if any, established from time to time by the Indenture Trustee or its Affiliates or a Canadian chartered bank.

(d)The Indenture Trustee shall not be liable for any loss or losses realized on such investments, other than those related to the negligence, willful acts or defaults of the Indenture Trustee.

5.11Indenture Trustee Not Required to Give Security

Without limiting the Trust Indenture, the Indenture Trustee shall not be required to give any bond or security in respect of the execution of the bare trusts, rights, duties, obligations, powers and authorities of this Agreement.

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5.12Indenture Trustee Not Bound to Act on Request

Except as otherwise specifically provided for in this Agreement, and without limiting the Trust Indenture, the Indenture Trustee shall not be required to act in accordance with any direction or request of the Trust and/or TCPL until a duly authenticated copy of the instrument or resolution containing such direction or request shall have been delivered to the Indenture Trustee, and the Indenture Trustee shall be empowered to act and rely upon any such copy purporting to be authenticated and believed in good faith by the Indenture Trustee to be genuine.  The Indenture Trustee shall retain the right not to act and shall not be held liable for refusing to act unless it receives documentation which complies with the terms of this Agreement. Such documentation must not require the exercise of any discretion or independent judgment, except as otherwise provided herein.

5.13Authority to Carry on Business

The Indenture Trustee represents to the Trust and/or TCPL that, at the date of execution and delivery by it of this Agreement, it is authorized to carry on the business of a trust company in the Province of Ontario but if, notwithstanding the provisions of this Section 5.13, it ceases to be so authorized to carry on business, the validity and enforceability of this Agreement, and the other rights granted in or resulting from the Indenture Trustee being a party to this Agreement, shall not be affected in any manner whatsoever by reason only of such event, but the Indenture Trustee shall, within 90 days after ceasing to be authorized to carry on the business of a trust company in the Province of Ontario, either become so authorized or resign in the manner and with the effect specified in Article 8.

5.14Conflicting Claims

Without limiting the Trust Indenture, if conflicting claims or demands are made or asserted with respect to any interest of any Holder in any Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares, including any disagreement between the heirs, representatives, successors or assigns succeeding to all or any part of the interest of any Holder in any Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares resulting in conflicting claims or demands being made in connection with such interest, then the Indenture Trustee shall be entitled, at its sole discretion, to refuse to recognize or to comply with any such claim or demand. In so refusing, the Indenture Trustee may elect not to exercise any rights subject to such conflicting claims or demands and, in so doing, the Indenture Trustee shall not be or become liable to any Person on account of such election or its failure or refusal to comply with any such conflicting claims or demands. The Indenture Trustee shall be entitled to continue to refrain from acting and to refuse to act until:

(a)the rights of all adverse claimants or other rights subject to such conflicting claims or demands have been adjudicated by a final judgment of a court of competent jurisdiction; or

(b)all differences or other rights subject to such conflicting claims or demands have been conclusively settled by a valid written agreement binding on all such adverse claimants, and the Indenture Trustee shall have been furnished with an executed copy of such agreement.

If the Indenture Trustee elects to recognize any claim or comply with any demand made by any such adverse claimant, it may in its discretion require such claimant to furnish such surety bond or other security satisfactory to the Indenture Trustee as it may deem appropriate to fully indemnify it as between all conflicting claims or demands.

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5.15Acceptance of Bare Trust

The Indenture Trustee hereby accepts the bare trust and duties created and provided for by and in this Agreement and agrees to perform the same upon the terms and conditions herein set forth and to hold all rights, privileges and benefits conferred hereby and by law, in bare trust, for TCPL and the various Persons who are from time to time Holders of Trust Notes — Series 2019-A, subject to all the terms and conditions herein set forth.

5.16Withholding Tax

TCPL or the Indenture Trustee may deduct or withhold (or such amount shall be deducted or withheld in accordance with the customary practice and procedures of the Clearing Agency) from any payment, distribution or delivery to any Holder amounts required or permitted by law to be deducted or withheld from such Holder’s distribution, payment or delivery and shall remit such amounts to the relevant tax authority in the manner and within the time required by law. Where the cash component of any payment, distribution or delivery to be made to a Holder is less than the amount that TCPL or the Indenture Trustee is required or permitted to withhold, TCPL or the Indenture Trustee shall be permitted to withhold from any non-cash payment, distribution or delivery to be made to the Holder and to dispose or arrange to dispose of such property in order to remit any amount to the relevant tax authority as required. TCPL shall provide written direction to the Indenture Trustee as to such amounts to be deducted or withheld; provided, however, that the Indenture Trustee shall deduct or withhold from any Holder’s distribution or delivery any amount it is required by law to deduct and withhold, and shall remit such amount to the relevant tax authority in the manner and within the time required by law, notwithstanding the failure of TCPL to provide any such direction following a request therefor from the Indenture Trustee, and in so doing the Indenture Trustee shall be deemed to have complied with its obligations hereunder. The Indenture Trustee shall file in the manner and within the time required by law any required tax returns and provide any required information slips relating to such withholding or deduction.

5.17Residency of Indenture Trustee

The Indenture Trustee hereby represents that it is a resident of Canada for the purposes of the Tax Act and the Indenture Trustee shall give the Trust and TCPL notice of any change in such status.

5.18Tax Reports

The Trust shall be solely responsible for all tax processing relating to or arising from the duties or actions contemplated by this Agreement, including any inquiry, evaluation, reporting, remittance, filing and issuance of tax slips, summaries, reports, except as is specifically delegated to the Indenture Trustee pursuant to this Agreement or as may be agreed subsequently, as confirmed in writing by the parties.

Without limiting the Trust Indenture, the Indenture Trustee shall process only such tax matters as have been specifically delegated to it pursuant to this Agreement or as may be agreed subsequently, and in doing so, the Indenture Trustee does not undertake to carry out any inquiry, evaluation, reporting, remittance, filing or issuance of tax slips, summaries and reports necessary or incidental thereto, which shall remain the sole responsibility of the Trust. The Indenture Trustee shall be entitled to rely upon and assume, without further inquiry or verification, the accuracy and completeness of any tax processing information, documentation or instructions received by the Indenture Trustee, directly or indirectly, from or on behalf of the Trust.

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5.19Compliance with Privacy Legislation

The parties acknowledge that federal, provincial and/or state legislation in Canada or the United States that address the protection of individuals’ personal information (collectively, “Privacy Laws”) may apply to obligations and activities under this Agreement. Despite any other provision of this Agreement, no party shall take or direct any action that would contravene, or cause any other party to contravene, applicable Privacy Laws.  The Indenture Trustee shall use commercially reasonable efforts to ensure that its services hereunder comply with Privacy Laws.  Specifically, the Indenture Trustee agrees: (a) to have a designated chief privacy officer; (b) to maintain policies and procedures to protect personal information and to receive and respond to any privacy complaint or inquiry; (c) to use personal information solely for the purposes of providing its services under or ancillary to this Agreement and not to use it for any other purpose except with the consent of or direction from the Trust and TCPL or the individual involved; (d) not to sell or otherwise improperly disclose personal information to any third party; and (e) to employ administrative, physical and technological safeguards to reasonably secure and protect personal information against loss, theft, or unauthorized access, use or modification.

5.20Compliance with Anti-Money Laundering Legislation

The Indenture Trustee shall retain the right not to act and shall not be liable for refusing to act if, due to a lack of information or for any other reason whatsoever, the Indenture Trustee, in its sole judgment, determines that such act might cause it to be in non-compliance with any applicable anti-money laundering or anti-terrorist legislation, regulation or guideline. The Trust hereby agrees that if any account to be opened, or interest to be held, by the Indenture Trustee in connection with this Agreement, for or to the credit of the Trust, is intended to be used by or on behalf of a third party, the Trust will complete and execute forthwith a declaration in the Indenture Trustee’s prescribed form as to the particulars of such third party.

ARTICLE 6
COMPENSATION

6.1Fees and Expenses of Indenture Trustee

The Trust and TCPL jointly and severally agree to pay to the Indenture Trustee reasonable compensation for all of the services rendered by it under this Agreement and shall reimburse the Indenture Trustee for all reasonable expenses incurred by it in connection therewith (including, but not limited to, taxes and compensation paid to experts, counsel and advisors and disbursements, including the cost and expense of any suit or litigation of any character and any proceedings before any governmental agency reasonably incurred by the Indenture Trustee); provided that the Trust and TCPL shall have no obligation to reimburse the Indenture Trustee for any expenses or disbursements paid, incurred or suffered by the Indenture Trustee in any suit or litigation in which the Indenture Trustee is determined to have acted with fraud, negligence or wilful misconduct. For administrative purposes, the Indenture Trustee may invoice TCPL unless instructed otherwise.

ARTICLE 7
INDEMNIFICATION AND LIMITATION OF LIABILITY

7.1Indemnification of Indenture Trustee

In addition to and without limiting the Trust Indenture, the Trust and TCPL jointly and severally agree to indemnify and hold harmless the Indenture Trustee and each of its directors, officers, employees, representatives and agents appointed and acting in accordance with this Agreement (collectively,

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the “Indemnified Parties”) against all claims, losses, damages, costs, penalties, fines, taxes, assessments of additional taxes, interest or penalties or other governmental charges, including the withholding or deduction or the failure to withhold or deduct same, any liability for failure to obtain proper certifications or to properly report to government authorities, and reasonable expenses (including reasonable expenses of the Indenture Trustee’s legal counsel) which, without fraud, negligence or wilful misconduct on the part of such Indemnified Party, are paid, incurred or suffered by the Indemnified Party by reason of or as a result of the Indenture Trustee’s acceptance or administration of the trust, its compliance with its duties set forth in this Agreement, or with any written or oral instructions delivered to the Indenture Trustee by the Trust or TCPL pursuant hereto (collectively, “Claims” and individually, a “Claim”). In no case will the Trust or TCPL be liable under this indemnity for any Claim if such Claim is incurred or suffered by reason of or as a result of the fraud, negligence or wilful misconduct of an Indemnified Party and unless the Trust and TCPL shall be notified by the Indenture Trustee of the written assertion of a Claim promptly after any of the Indemnified Parties shall have received any such written assertion of a Claim or shall have been served with a summons or other first legal process giving information as to the nature and basis of the Claim, provided that a failure or delay to so notify the Trust and TCPL shall not diminish the liability of the Trust and TCPL hereunder except to the extent that the Trust and TCPL are materially prejudiced by such failure or delay. Subject to (ii) below, the Trust and TCPL shall be entitled to participate at their own expense in the defence and, if the Trust or TCPL so elect at any time after receipt of such notice, any of them may assume the defence of any suit brought to enforce any such Claim. The Indenture Trustee shall have the right to employ separate counsel in any such suit and participate in the defence thereof but the fees and expenses of such counsel shall be at the expense of the Indenture Trustee unless: (i) the employment of such counsel has been authorized by the Trust or TCPL, such authorization not to be unreasonably withheld; or (ii) the named parties to any such suit include both the Indenture Trustee and the Trust or TCPL and the Indenture Trustee shall have been advised by counsel acceptable to the Trust and TCPL that there may be one or more legal defences available to the Indenture Trustee that are different from or in addition to those available to the Trust or TCPL and that an actual or potential conflict of interest exists (in which case the Trust and TCPL shall not have the right to assume the defence of such suit on behalf of the Indenture Trustee but shall be liable to pay the reasonable fees and expenses of counsel for the Indenture Trustee). This provision shall survive the resignation or removal of the Indenture Trustee or the termination of this Agreement.

7.2Limitation of Liability

Without limiting the Trust Indenture, the Indenture Trustee shall not be held liable for any loss which may occur by reason of insolvency or termination of TCPL, the Trust or any Holder, as the case may be, or early termination of any investment under Section 5.10 or depreciation of the value of any part of the Series 2019-A Trust Estate or any loss incurred on any investment of funds pursuant to this Agreement, except to the extent that such loss is attributable to fraud, negligence or wilful misconduct on the part of the Indenture Trustee.

ARTICLE 8
CHANGE OF INDENTURE TRUSTEE

8.1Resignation of Indenture Trustee

The Indenture Trustee, or any Indenture Trustee hereafter appointed, may at any time resign by giving written notice of such resignation to the Trust and TCPL specifying the date on which it desires to resign, provided that such notice shall be given in accordance with the Trust Indenture at least 60 days before such desired resignation date, unless the Trust and TCPL otherwise agree, and further provided that such resignation shall not take effect until the date of the appointment of a successor Indenture Trustee and the acceptance of such appointment by the successor Indenture Trustee, in each case in accordance with the

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Trust Indenture. Upon receiving such notice of resignation, the Trust and TCPL shall promptly appoint a successor Indenture Trustee in accordance with the Trust Indenture, which successor shall be a resident of Canada for the purposes of the Tax Act, by written instrument in duplicate, one copy of which shall be delivered to the resigning Indenture Trustee and one copy to the successor Indenture Trustee. Failing acceptance by a successor Indenture Trustee, a successor Indenture Trustee may be appointed in accordance with the Trust Indenture by an order of the Superior Court of Justice (Ontario) upon application of one or more of the parties hereto at the joint and several expense of the Trust and TCPL.

8.2Removal of Indenture Trustee

The Indenture Trustee, or any Indenture Trustee hereafter appointed, may be removed in accordance with the Trust Indenture: (i) with cause or if the Indenture Trustee at any time ceases to be a resident of Canada for the purposes of the Tax Act by written instrument executed by the Trust and TCPL; or (ii) with or without cause by the Holders of Trust Notes — Series 2019-A pursuant to an Extraordinary Resolution and, if any TCPL Deferral Preferred Shares are outstanding, by the affirmative vote of Holders of the TCPL Deferral Preferred Shares passed in accordance with the TCPL Deferral Preferred Share Provisions (as though the removal were an amendment to the TCPL Deferral Preferred Share Provisions), in all cases, at any time on 60 days’ prior written notice, which notice shall be delivered to the Indenture Trustee so removed and to the successor Indenture Trustee in accordance with the Trust Indenture.

8.3Successor Indenture Trustee

Any successor Indenture Trustee appointed in accordance with the Trust Indenture shall execute, acknowledge and deliver to the Trust and TCPL and to its predecessor Indenture Trustee an instrument accepting such appointment hereunder and under the Trust Indenture. Subject to the Trust Indenture, thereupon, the resignation or removal of the predecessor Indenture Trustee shall become effective and such successor Indenture Trustee, without any further act, deed or conveyance, shall become vested with all the rights, powers, duties and obligations of its predecessor under this Agreement, with like effect as if originally named as Indenture Trustee in accordance with the Trust Indenture. However, on the written request of the Trust and TCPL or of the successor Indenture Trustee, the Indenture Trustee ceasing to act shall, upon payment of any amounts then due to it pursuant to the provisions of this Agreement, execute and deliver an instrument transferring to such successor Indenture Trustee all the rights and powers of the Indenture Trustee so ceasing to act. In addition to and without limiting the Trust Indenture, upon the request of any such successor Indenture Trustee, the Trust and TCPL, such predecessor Indenture Trustee shall execute any and all instruments in writing for more fully and certainly vesting in and confirming to such successor Indenture Trustee all such rights and powers. Without limiting the Trust Indenture, any company into which the Indenture Trustee may be merged or with which it may be consolidated or amalgamated, or any company resulting or continuing from any merger, consolidation or amalgamation to which the Indenture Trustee is a party or any company to which the Indenture Trustee may transfer all or substantially all of its corporate trust business, shall be a successor Indenture Trustee under this Agreement, without the execution or filing of any paper or further act on the part of any of the parties hereto.

8.4Notice of Successor Indenture Trustee

Upon acceptance of appointment by a successor Indenture Trustee as provided in this Agreement, the Trust and TCPL shall cause to be mailed notice of the succession of such Indenture Trustee under this Agreement to each registered Holder. If the Trust or TCPL fails to cause such notice to be mailed within 10 days after acceptance of appointment by the successor Indenture Trustee, the successor Indenture Trustee shall cause such notice to be mailed at the expense of the Trust and TCPL.

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ARTICLE 9
AMENDMENTS AND SUPPLEMENTAL AGREEMENTS

9.1Ministerial Amendments

The parties to this Agreement may in writing, at any time and from time to time, without the approval of the Holders, amend, supplement or modify this Agreement for the purposes of:

(a)adding to the covenants of any or all of the parties hereto for the protection of the Holders hereunder;

(b)making such amendments or modifications not inconsistent with this Agreement as may be necessary or desirable with respect to matters or questions which, in the mutual opinion of the Trust, TCPL and the Indenture Trustee and their respective counsel, having in mind the best interests of the Holders as a whole, it may be expedient to make;

(c)making such changes or corrections which, on the advice of counsel to the Trust, TCPL and the Indenture Trustee, are required for the purpose of curing or correcting any ambiguity or defect or inconsistent provision or clerical omission or mistake or manifest error, provided that each of the Trust, TCPL and their respective counsel, and the Indenture Trustee based on the opinion of Counsel, shall be of the opinion that such changes or corrections shall not be prejudicial to the interests of the Holders as a whole; or

(d)making any additions to, deletions from or alterations of the provisions of this Agreement which, in the opinion of the Indenture Trustee and its counsel, shall not be prejudicial to the interests of the Holders as a whole or which, in the opinion of counsel to the Trust, TCPL and the Indenture Trustee, are necessary or advisable in order to incorporate, reflect or comply with any legislation the provisions of which apply to the Trust, TCPL, the Indenture Trustee or this Agreement.

9.2Meeting to Consider Amendments

The Trust and, if applicable, TCPL, shall call a meeting or meetings of the Holders for the purpose of considering and, if thought fit, approving, with the consent of Holders of Trust Notes — Series 2019-A or registered holders of Trust Notes, as applicable in accordance with the Trust Indenture pursuant to an Extraordinary Resolution and, if any TCPL Deferral Preferred Shares are then outstanding, of the Holders of TCPL Deferral Preferred Shares in accordance with the TCPL Deferral Preferred Share Provisions (as though such action were an amendment to TCPL Deferral Preferred Share Provisions), as applicable, any proposed supplement, amendment or modification of this Agreement other than those referred to in Section 9.1. Any such meeting or meetings will be called and held in accordance with the Trust Indenture, TCPL Deferral Preferred Share Provisions (if applicable) and all Applicable Laws. Any supplement, amendment or modification referred to in this Section 9.2 shall be provided to the Indenture Trustee by the Trust or TCPL, as the case may be.

9.3Execution of Supplemental Agreements

No supplement or amendment to, or modification or waiver of, any of the provisions of this Agreement shall be effective unless made in writing and signed by all of the parties hereto. Subject to compliance with all Applicable Laws, the Trust, TCPL and the Indenture Trustee may, subject to the provisions hereof, and shall, when so directed by this Agreement, from time to time, execute and deliver

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agreements or other instruments supplemental hereto, evidencing any such supplement, amendment, modification or waiver which thereafter shall form part hereof.

ARTICLE 10
TERMINATION

10.1Term

This Agreement shall continue until the earliest to occur of the following events:

(a)no Trust Notes — Series 2019-A are outstanding and held by a Person other than TCPL or any of its Affiliates;

(b)each of the Trustee and TCPL elects in writing to terminate this Agreement and such termination is approved by the Holders in accordance with Section 9.2; and

(c)21 years after the death of the last survivor of the descendants of Her Majesty Queen Elizabeth II of the United Kingdom of Great Britain and Northern Ireland living on the date of the creation of the Trust.

10.2Survival of Agreement

This Agreement shall survive any termination of the bare trust created hereby and shall continue until there are no Trust Notes — Series 2019-A outstanding and held by a Person other than TCPL or any of its Affiliates and there are no TCPL Deferral Preferred Shares outstanding; provided, however, that the provisions of Article 6 and Article 7 shall survive any such termination of this Agreement.

ARTICLE 11
GENERAL

11.1Severability

If any provision of this Agreement is held to be invalid, illegal or unenforceable, the validity, legality or enforceability of the remainder of this Agreement shall not, in any way, be affected or impaired thereby and this Agreement shall be carried out as nearly as possible in accordance with its original terms and conditions.

11.2Enurement

This Agreement shall be binding upon and enure to the benefit of the parties hereto and their respective successors and permitted assigns and to the benefit of the Holders and their respective heirs, executors, personal representatives, successors and assigns.

11.3Notices to Parties

All notices and other communications between the parties hereunder shall be in writing and shall be deemed to have been given if delivered personally or by confirmed telecopy to the parties at the following addresses (or at such other address for such party as shall be specified in notice given hereunder):

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(a)if to TCPL:

TransCanada PipeLines Limited
450 - 1st Street SW
Calgary, Alberta
T2P 5H1

Attention: Corporate Secretary
Facsimile: (403) 920-2467

(b)if to the Trust:

TransCanada Trust
c/o Computershare Trust Company of Canada
530 8 Avenue SW
Calgary, Alberta
T2P 3S8

Attention: Manager, Corporate Trust
Facsimile: (403) 267-6598

(c)if to the Indenture Trustee:

AST Trust Company (Canada)
600, the Dome Tower
333 — 7th Avenue SW
Calgary, Alberta
T2P 2Z1

Attention: Director, Corporate Trust
Facsimile: (403) 276-3916

Any notice or other communication given personally shall be deemed to have been given and received upon delivery thereof, unless given on a day that is not a Business Day in which case it shall be deemed to be given on the next following Business Day, and if given by telecopy shall be deemed to have been given and received on the date of receipt thereof unless such day is not a Business Day, in which case it shall be deemed to have been given and received upon the immediately following Business Day.

11.4Notice to Holders

Any and all notices to be given and any documents to be sent to any Holder hereunder may be given or sent to the address of such Holder shown on the register of holders of Trust Notes — Series 2019-A or TCPL Deferral Preferred Shares, by prepaid first class mail or otherwise in any manner permitted by the Trust Notes — Series 2019-A Provisions or TCPL Deferral Preferred Share Provisions, as applicable, and shall be deemed to be received (if given or sent in such manner) at the time specified in the Trust Notes — Series 2019-A Provisions or TCPL Deferral Preferred Share Provisions.

11.5Risk of Payments by Post

Whenever payments are to be made or documents are to be sent to any Holder by the Trust, TCPL or the Indenture Trustee, or by such Holder to the Trust, TCPL or the Indenture Trustee, the making of such

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payment or sending of such document through the post shall be at the risk of the Trust, TCPL or the Indenture Trustee, as applicable, in the case of payments made or documents sent by the Trust, TCPL or the Indenture Trustee, as applicable, and the Holder, in the case of payments made or documents sent by the Holder.

11.6Counterparts

This Agreement may be executed by manual signature in counterparts, each of which shall be deemed an original and all of which, when taken together, shall be deemed to constitute one and the same instrument.

11.7Jurisdiction

This Agreement shall be governed by and construed in accordance with the laws of the Province of Ontario and the federal laws of Canada applicable in the Province of Ontario.

11.8Exclusion of Contractual Liability

In accordance with Section 7.15 of the Declaration of Trust, to the extent that this Agreement operates to create obligations of the Trustee, such obligations are not binding upon the Trustee except in its capacity as trustee of the Trust, nor shall resort be had to the property of the Trustee except in its capacity as Trustee of the Trust and only the assets of the Trust shall be so bound.

11.9Appointment of Administrative Agent

The parties hereto acknowledge that the Trustee has appointed TCPL as Administrative Agent under the Administration Agreement and has delegated to it the powers (and TCPL has assumed the obligations) as set out in the Administration Agreement.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their duly authorized officers as of the date first above written.

TRANSCANADA TRUST by its Administrative Agent, TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary
TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary

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TC ENERGY CORPORATION
By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary
AST TRUST COMPANY (CANADA), as Indenture Trustee
By:	/s/ Nelia Andrade
	Name:	Nelia Andrade
	Title:	Authorized Signatory
By:	/s/ Marta Recinos
	Name:	Marta Recinos
	Title:	Authorized Signatory

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SCHEDULE A

TCPL DEFERRAL PREFERRED SHARE PROVISIONS

FIRST PREFERRED SHARES, SERIES-[·] DEFERRAL

There is hereby authorized and created a series of First Preferred Shares designated as the “First Preferred Shares, Series-[·] Deferral” (hereinafter referred to as the “Deferral Preferred Shares, Series-[·]”) consisting of up to [·] Deferral Preferred Shares.  The Deferral Preferred Shares, Series-[·] may be issued in whole or in fractional shares, as provided below, and shall, in addition to the rights, privileges, restrictions and conditions attaching to the First Preferred Shares as a class (collectively and respectively, the “First Preferred Shares Class Provisions” and the “First Preferred Shares”), carry and be subject to the following rights, privileges, restrictions and conditions (collectively, the “Deferral Preferred Shares, Series-[·] Provisions”):

Dividends

1.The holders of the Deferral Preferred Shares, Series-[·] shall be entitled to receive and the Corporation shall pay thereon, as and when declared by the board of directors out of the monies of the Corporation properly applicable to the payment of dividends, on each Dividend Payment Date, fixed cumulative preferential cash dividends equal to the quotient obtained by dividing: (x) the product obtained by multiplying $1,000 by a rate per annum equal to the rate of interest payable by the Trust on the Trust Notes as of the Issue Date, by (y) four; provided that if an event (including a redemption) shall occur that results in accrued and unpaid dividends for a partial Dividend Period becoming payable, the dividend payable for any partial Dividend Periods shall be equal to the product obtained by multiplying the amount in (x) above by a fraction, the numerator of which is the actual number of days attributable to the partial Dividend Period and the denominator of which is 365, subject in each case to any applicable withholding tax. If on any Dividend Payment Date the dividend payable on such date is not paid in full on all of the Deferral Preferred Shares, Series-[·] then issued and outstanding, such dividend or the unpaid part thereof shall be paid on a subsequent date or dates to be determined by the board of directors on which the Corporation shall have sufficient monies properly applicable, under the provisions of any applicable law and under the provisions of any trust indenture securing bonds, debentures or other securities of the Corporation, to the payment of the same.  The holders of the Deferral Preferred Shares, Series-[·] shall not be entitled to any dividends other than or in excess of the cumulative preferential cash dividends hereinbefore provided.  Payment shall be made by electronic funds transfer or by cheque of or on behalf of the Corporation payable in lawful money of the United States (less any tax required to be deducted) and payment thereof shall satisfy such dividends.

Liquidation, Dissolution or Winding-Up

2.In the event of the liquidation, dissolution or winding-up of the Corporation, whether voluntary or involuntary, or any other distribution of assets of the Corporation among its shareholders for the purpose of winding-up its affairs, the holders of the Deferral Preferred Shares, Series-[·] in accordance with the First Preferred Shares Class Provisions, shall be entitled to receive the amount of $1,000 (less any amount that may have been returned to the holders of Deferral Preferred Shares, Series-[·] as a return of capital), together with an amount equal to all accrued and unpaid dividends thereon, which amount for such purposes shall be calculated as if such dividends were accruing for the period from the expiration of the last Dividend Period for which dividends thereon have been paid up to the date of such event, subject to any applicable withholding tax, the whole before any amount shall be paid or any property or assets of the Corporation

shall be distributed to the holders of the common shares or to the holders of any other shares ranking junior to the Deferral Preferred Shares, Series-[·]. After payment to the holders of the Deferral Preferred Shares, Series-[·] of the amount so payable to them they shall not be entitled to share in any other distribution of the property or assets of the Corporation.

Voting Rights

3.The holders of the Deferral Preferred Shares, Series-[·] shall not be entitled to receive notice of or attend any meeting of the shareholders of the Corporation or to vote at any such meeting unless and until the Corporation from time to time shall fail to pay in the aggregate six quarterly dividends on the Deferral Preferred Shares, Series-[·] on the dates on which the same should be paid according to the terms thereof, whether or not consecutive and whether or not dividends have been declared and whether or not there are any moneys of the Corporation properly applicable to the payment of dividends. Thereafter each holder of Deferral Preferred Shares, Series-[·] shall be entitled to receive notice of all meetings of shareholders and attend thereat and shall be entitled, at any and all such meetings, to one vote for each Deferral Preferred Share, Series-[·] held and shall continue to be entitled to notice and so to attend and vote until such time as all arrears of dividends on any outstanding Deferral Preferred Shares, Series-[·] shall have been paid, whereupon the rights of holders of Deferral Preferred Shares, Series-[·] to receive notice of meetings and to attend thereat and vote in respect of such Deferral Preferred Shares, Series-[·] shall cease unless and until six quarterly dividends on the Deferral Preferred Shares, Series-[·] shall again be in arrears and unpaid, whereupon the holders of the Deferral Preferred Shares, Series-[·] shall again have the right to receive notice and to attend and vote as above provided and so on from time to time.

Purchase for Cancellation

4.The Corporation may, at any time and from time to time, subject to the provisions of the Canada Business Corporations Act, and the provisions below under “Redemption” and “Restrictions on Payment of Dividends and Reduction of Junior Capital”, purchase for cancellation (if obtainable), in the manner provided in the First Preferred Shares Class Provisions, the whole or any part of the Deferral Preferred Shares, Series-[·] outstanding from time to time at any price, subject to any applicable withholding tax.

Redemption

5.Subject to the provisions of the Canada Business Corporations Act and the provisions below under “Restrictions on Payment of Dividends and Reduction of Junior Capital” the Corporation may redeem all, or from time to time any part, of the outstanding Deferral Preferred Shares, Series-[·], without the consent of the holders of the Deferral Preferred Shares, Series-[·], on not more than 60 days and not less than 30 days prior notice, at any time by the payment of an amount in cash for each such share so redeemed of $1,000 per share (such price being hereinafter referred to as the “Redemption Price”) together with an amount equal to all accrued and unpaid dividends thereon, subject to any applicable withholding tax, which amount for such purpose shall be calculated as if such dividends were accruing for the period from the expiration of the last Dividend Period for which dividends thereon have been paid up to the date of such redemption.

Restrictions on Payment of Dividends and Reduction of Junior Capital

6.So long as any of the Deferral Preferred Shares, Series-[·] are outstanding the Corporation shall not, without the approval of the holders of the Deferral Preferred Shares, Series-[·]:

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(a)declare any dividend (other than stock dividends on shares ranking junior to the Deferral Preferred Shares, Series-[·]) on the common shares or any shares ranking junior to the Deferral Preferred Shares, Series-[·], or

(b)redeem, repurchase or otherwise retire any of the common shares or any other shares ranking junior to the Deferral Preferred Shares, Series-[·] (except out of the net cash proceeds of a substantially concurrent issue of shares ranking junior to the Deferral Preferred Shares, Series-[·]).

In addition, so long as any of the Deferral Preferred Shares, Series-[·] are outstanding the Corporation shall not, without the approval of the holders of the Deferral Preferred Shares, Series-[·], redeem, repurchase or otherwise retire: (i) less than all of the Deferral Preferred Shares, Series-[·] together with any other series of Deferral Preferred Shares of the Corporation that may be outstanding; or (ii) except pursuant to any purchase obligation, sinking fund, retraction privilege, or mandatory redemption provisions attaching to any series of preferred shares of the Corporation, any other shares ranking on parity with the Deferral Preferred Shares, Series-[·] (other than another series of Deferral Preferred Shares), unless, in each case, all dividends payable on the Deferral Preferred Shares, Series-[·], and on all other shares ranking prior to or on parity with the Deferral Preferred Shares, Series-[·], have been declared and paid or set apart for payment, subject to any applicable withholding tax.

Fractional Shares

7.The Deferral Preferred Shares, Series-[·] may be issued in whole or in fractional shares.  Each fractional Deferral Preferred Shares, Series-[·] shall carry and be subject to the rights, privileges, restrictions and conditions (including voting rights and dividend rights) of the Deferral Preferred Shares, Series-[·] in proportion to the applicable fraction.

Deferral Preferred Shares, Series-[·] Definitions

8.The following terms shall have the following respective meanings:

“Business Day” means a day on which the Corporation is open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

“Dollars”, “dollars” or the sign “$” shall be deemed to be a reference to lawful money of the United States.

“Dividend Payment Date” means March 31, June 30, September 30 and December 31 of each year during which any Deferral Preferred Shares, Series-[·] are issued and outstanding.

“Dividend Period” means, initially, the period from and including the Issue Date to but excluding the next following Dividend Payment Date, and thereafter the period from and including each Dividend Payment Date to, but excluding, the next following Dividend Payment Date (including any partial period as contemplated in section 1, above).

“Issue Date” means the date on which the Deferral Preferred Shares, Series-[·] are issued.

“Trust” means TransCanada Trust, a unit trust established under the laws of the Province of Ontario.

“Trust Notes” means the Trust Notes — Series 2019-A of the Trust, representing a series of junior subordinated unsecured debt obligations, due ·, 2079.

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Amendments

9.Sections 1 to 11, inclusive, of these Deferral Preferred Shares, Series-[·] Provisions may be repealed, altered, modified, amended or amplified only with the sanction of the holders of the Deferral Preferred Shares, Series-[·] given as hereinafter specified in addition to any other approval required by the Canada Business Corporations Act.

Sanction by Holders of Deferral Preferred Shares, Series-[·]

10.The sanction by holders of the Deferral Preferred Shares, Series-[·] as to any and all matters referred to herein or as to any change adversely affecting the rights or privileges of the Deferral Preferred Shares, Series-[·] may be given and shall be deemed to have been sufficiently given if given by the holders of the Deferral Preferred Shares, Series-[·] in the manner provided in the First Preferred Shares Class Provisions with respect to the sanction of the holders of any series of the First Preferred Shares and the said provisions shall apply mutatis mutandis.

Tax Election

11.The Corporation shall elect, in the manner and within the time provided under section 191.2 of the Income Tax Act (Canada) or any successor or replacement provision of similar effect, to pay tax at a rate and take all other necessary action under such Act such that no holder of the Deferral Preferred Shares, Series-[·] will be required to pay tax on dividends received on the Deferral Preferred Shares, Series-[·] under section 187.2 of Part IV.1 of such Act or any successor or replacement provision of similar effect.

Non-Business Days

12.In the event that any date on which any dividend is payable by the Corporation, or any date on or by which any other action is required to be taken or determination made by the Corporation or the holders of Deferral Preferred Shares, Series-[·] hereunder, is not a Business Day, then such dividend shall be payable, or such other action shall be required to be taken or determination made, on or before the next succeeding day that is a Business Day.

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SCHEDULE B

DEFERRAL EVENT NOTICE

TO:	AST Trust Company (Canada) (the “Indenture Trustee”)
AND TO:	Computershare Trust Company (the “Trustee”)

In accordance with the provisions of an Assignment and Set-Off Agreement dated September 12, 2019 (the “Agreement”) among TransCanada Trust, TransCanada PipeLines Limited (“TCPL”), TC Energy Corporation and the Indenture Trustee, TCPL hereby provides notice, pursuant to Section 3.8 of the Agreement, as to the occurrence of a “Deferral Event”, as defined in the Agreement, on [Date].

DATED at Toronto this                day of                    , 20      .

TRANSCANADA PIPELINES LIMITED
Per:
	Name:
	Title:
Per:
	Name:
	Title:

EX-2

Exhibit 2

TRANSCANADA TRUST

- and -

TRANSCANADA PIPELINES LIMITED

- and -

AST TRUST COMPANY (CANADA)

SHARE EXCHANGE AGREEMENT

Trust Notes — Series 2019-A

Dated as of September 12, 2019

Table of Contents

		Page
ARTICLE 1 DEFINITIONS AND INTERPRETATION		1
1.1	Definitions	1
1.2	Additional Definitions	4
1.3	Headings	5
1.4	Extended Meanings	5
1.5	Date of Any Action	5
1.6	Payments	5
1.7	References to Statutes	5
1.8	Currency References	5
1.9	Rights of Set-Off	5
1.10	Schedules	5
ARTICLE 2 TRUST		5
2.1	Establishment of Trust	5
ARTICLE 3 AUTOMATIC EXCHANGE		6
3.1	Creation and Grant of Automatic Exchange	6
3.2	Limitation	6
3.3	Automatic Exchange	7
3.4	Idem	7
3.5	Procedure	7
ARTICLE 4 SERIES 2019-A SUBSCRIPTION RIGHT		8
4.1	Grant of Series 2019-A Subscription Right	8
4.2	Series 2019-A Subscription Right—Procedure	8
4.3	Idem	9
ARTICLE 5 COVENANTS, REPRESENTATIONS AND WARRANTIES		9
5.1	Certain Representations	9
5.2	Notification of Certain Events	9
5.3	Qualification of TCPL Exchange Preferred Shares	9
5.4	TCPL Support	10
5.5	Additional TCPL Covenants	10
5.6	Capital Reorganizations and Amalgamations of TCPL	11
5.7	Right not to Deliver TCPL Exchange Preferred Shares	11
ARTICLE 6 EXCHANGE TRUSTEE		12
6.1	Powers and Duties of Exchange Trustee	12
6.2	No Conflict of Interest	13
6.3	Dealings with Transfer Agents, Registrars and the Clearing Agency	13
6.4	Books and Records	13
6.5	Indemnification Prior to Certain Actions by Exchange Trustee	13
6.6	Actions by Holders	14
6.7	Reliance upon Declarations	14
6.8	Evidence and Authority to Exchange Trustee	14
6.9	Experts, Advisers and Agents	15
6.10	Investment of Money Held by or on behalf of Exchange Trustee	15
6.11	Exchange Trustee Not Required to Give Security	16
6.12	Exchange Trustee Not Bound to Act on Request	16
6.13	Authority to Carry on Business	16

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Table of Contents (continued)

		Page
6.14	Conflicting Claims	16
6.15	Acceptance by Exchange Trustee	17
6.16	Withholding Tax	17
6.17	Residency of Exchange Trustee	17
6.18	Tax Reports	17
6.19	Compliance with Privacy Legislation	17
6.20	Compliance with Anti-Money Laundering Legislation	18
ARTICLE 7 COMPENSATION		18
7.1	Fees and Expenses of Exchange Trustee	18
ARTICLE 8 INDEMNIFICATION AND LIMITATION OF LIABILITY		18
8.1	Indemnification of Exchange Trustee	18
8.2	Limitation of Liability	19
ARTICLE 9 CHANGE OF EXCHANGE TRUSTEE		19
9.1	Resignation of Exchange Trustee	19
9.2	Removal of Exchange Trustee	19
9.3	Successor Exchange Trustee	20
9.4	Notice of Successor Exchange Trustee	20
ARTICLE 10 AMENDMENTS AND SUPPLEMENTAL AGREEMENTS		20
10.1	Ministerial Amendments	20
10.2	Meeting to Consider Amendments	21
10.3	Execution of Supplemental Agreements	21
ARTICLE 11 TERMINATION		21
11.1	Term	21
11.2	Survival of Agreement	21
ARTICLE 12 GENERAL		22
12.1	Severability	22
12.2	Enurement	22
12.3	Notices to Parties	22
12.4	Notice to Holders	23
12.5	Risk of Payments by Post	23
12.6	Counterparts	23
12.7	Jurisdiction	23
12.8	Exclusion of Contractual Liability	23
12.9	Appointment of Administrative Agent	23
SCHEDULE A TCPL EXCHANGE PREFERRED SHARE PROVISIONS		25

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SHARE EXCHANGE AGREEMENT

SHARE EXCHANGE AGREEMENT dated as of September 12, 2019,

AMONG:	TRANSCANADA TRUST (the “Trust”), a unit trust established under the laws of the Province of Ontario, by its administrative agent, TransCanada PipeLines Limited;
AND:	TRANSCANADA PIPELINES LIMITED (“TCPL”), a corporation existing under the laws of Canada;
AND:	AST TRUST COMPANY (CANADA) (the “Exchange Trustee”), formerly CST Trust Company, a trust company existing under the laws of Canada;

WHEREAS, the Trust has issued and outstanding voting trust units (the “Voting Trust Units”), all of which are owned by TCPL, U.S.$750,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2015-A due May 20, 2075, U.S.$1,200,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2016-A due August 15, 2076, U.S.$1,500,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2017-A due March 15, 2077, and Cdn.$1,500,000,000 aggregate principal amount of unsecured, subordinated Trust Notes — Series 2017-B due May 18, 2077, representing subordinated unsecured debt obligations of the Trust and for which it has also entered into share exchange agreements on substantially the same terms as this Agreement;

WHEREAS, on the date hereof the Trust has issued and outstanding U.S.$1,100,000,000  aggregate principal amount of unsecured, subordinated Trust Notes — Series 2019-A due September 15, 2079 (the “Trust Notes — Series 2019-A”);

WHEREAS, TCPL wishes to grant the Automatic Exchange to the Exchange Trustee and the Series 2019-A Subscription Right to the Trust, in each case on the terms set forth in this Agreement;

WHEREAS, the Exchange Trustee, for and on behalf of the Holders, has been appointed pursuant to the Trust Indenture to irrevocably commit to the Automatic Exchange on the terms set forth in this Agreement;

WHEREAS, the parties to this Agreement desire to implement procedures whereby the Trust, TCPL and the Exchange Trustee will take all actions necessary to ensure that the Automatic Exchange and the Series 2019-A Subscription Right are given full and proper effect; and

WHEREAS, these recitals and any statements of fact in this Agreement are made by TCPL and the Trust and not by the Exchange Trustee;

NOW, THEREFORE, in consideration of the respective covenants and agreements provided in this Agreement and other good and valuable consideration (the receipt and sufficiency of which is hereby acknowledged), the parties agree as follows:

ARTICLE 1
DEFINITIONS AND INTERPRETATION

1.1Definitions

In this Agreement,

“Administration Agreement” means the agreement between the Trustee and TCPL dated September 16, 2014 pursuant to which TCPL, or any successor thereto, serves as administrative agent to the Trust, as amended from time to time.

“Administrative Agent” has the meaning ascribed thereto in the Administration Agreement.

“Affiliate” means, in respect of any Person, any other Person which, directly or indirectly, is in control of, is controlled by or is under common control with such Person; provided that the Trust and TCPL and its Affiliates shall be Affiliates for so long as TCPL and/or its Affiliates hold at least a majority of the voting trust units of the Trust.  For the purposes of this definition, a Person will be deemed to be “controlled by” another Person if such other Person possesses directly, or indirectly, power to direct or cause the direction of the management and policies of such Person, whether by contract or otherwise.

“Agreement” means this Share Exchange Agreement, including Schedule A, as amended, supplemented or restated from time to time; and the expressions “hereof”, “herein”, “hereto”, “hereunder”, “hereby” and similar expressions refer to this Agreement in its entirety and each schedule, and not to any particular Article, section, subsection or other part of this Agreement.

“Applicable Laws” means the Applicable Laws as defined in Section 5.3.

“Assignment and Set-Off Agreement” means the Assignment and Set-Off Agreement dated the date hereof among the Trust, TCPL, TC Energy Corporation and the Indenture Trustee, as bare trustee and nominee on behalf of holders of Trust Notes, as amended from time to time.

“Authorized Investments” has the meaning ascribed thereto in the Trust Indenture.

“Authorized Officer” means any director or officer of TCPL, or a designated representative of TCPL designated in writing by any director or officer of TCPL.

“Automatic Exchange” means the automatic exchange of the Trust Notes — Series 2019-A for the right to be issued newly issued TCPL Exchange Preferred Shares upon the occurrence of an Automatic Exchange Event.

“Automatic Exchange Event” means an event giving rise to the Automatic Exchange, being the occurrence of any one of the following: (i) the making by TCE or TCPL of a general assignment for the benefit of its creditors or a proposal (or the filing of a notice of its intention to do so) under the Bankruptcy and Insolvency Act (Canada), (ii) any proceeding instituted by TCE or TCPL seeking to adjudicate it a bankrupt or insolvent or seeking liquidation, winding up, dissolution, reorganization, arrangement, adjustment, protection, relief or composition of its debts under any law relating to bankruptcy, insolvency or reorganization, or seeking the entry of an order for the appointment of a receiver, interim receiver,  trustee or other similar official for TCE or TCPL or any substantial part of its property and assets in circumstances where TCE or TCPL, as applicable, is adjudged a bankrupt or insolvent, (iii) a receiver, interim receiver, trustee or other similar official is appointed over TCE or TCPL or for any substantial part of its property and assets by a court of competent jurisdiction in circumstances where TCE or TCPL, as applicable, is adjudged a bankrupt or insolvent;  or (iv)  any proceeding is instituted against TCE or TCPL seeking to adjudicate it a bankrupt or insolvent or seeking liquidation, winding up, dissolution, reorganization, arrangement, adjustment, protection, relief or composition of its debts under any law relating to bankruptcy, insolvency or reorganization, or seeking the entry of an order for the appointment of a receiver, interim receiver, trustee or other similar official for TCE or TCPL or any substantial part of its property and assets in circumstances where TCE or TCPL, as applicable, is adjudged a bankrupt or insolvent,  and either such proceeding has not been stayed or dismissed within 60 days of the institution of any such proceeding or the actions sought in such proceedings occur (including the entry of an order for relief against TCE or TCPL or the appointment of a receiver, interim receiver, trustee, or other similar official for it or for any substantial part of its property and assets).

“Automatic Exchange Event Notice” has the meaning ascribed thereto in Section 3.4.

“Book-Entry System” has the meaning ascribed thereto in the Trust Indenture.

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“Business Day” means a day on which TCPL, the Trust and the Indenture Trustee are open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

“Clearing Agency” means the Depository Trust Company and its nominee or any successors and/or any other or additional organization that performs securities transfer, settlement, clearing and/or pledge services in relation to the Trust Notes — Series 2019-A or the TCPL Exchange Preferred Shares.

“Declaration of Trust” means the Declaration of Trust dated as of September 16, 2014 governing the Trust, as it may be amended, supplemented or restated from time to time.

“Exchange Notice” has the meaning ascribed thereto in Section 3.5.

“Exchange Trustee” means AST Trust Company (Canada), formerly CST Trust Company, in its capacity as trustee and for and on behalf of the Holders under this Agreement, and, subject to Article 9, includes any successor Exchange Trustee and permitted assigns.

“Extraordinary Resolution” means an extraordinary resolution passed in accordance with Article 9 of the Trust Indenture.

“Holders” means the registered holders, whether holding on their own account or on behalf of beneficial owners, from time to time, of Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares, as applicable, or, where the context requires, all of such holders, except that for purposes of any withholding tax, Holders shall mean beneficial owners, from time to time, of Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares, as applicable, or, where the context requires, all of such beneficial owners.

“Indenture Trustee” means AST Trust Company (Canada), in its capacity as trustee under the Trust Indenture or such other successor trustee as may be appointed from time to time.

“Ineligible Person” means any Person whose address is in, or whom TCPL or the Trust or the Transfer Agent has reason to believe is a resident of, any jurisdiction other than Canada or the United States, in each case to the extent that: (i) the issuance or delivery by TCPL or the Trust to such Person of TCPL Exchange Preferred Shares following an Automatic Exchange would require TCPL or the Trust to take any action to comply with securities or analogous laws of that other jurisdiction; or (ii) withholding tax would be applicable in connection with the delivery to such Person of TCPL Exchange Preferred Shares following an Automatic Exchange.

“Interest Payment Date” means, prior to and excluding September 15, 2029, March 15 and September 15 (other than September 15, 2019) and, starting September 15, 2029, March 15, June 15, September 15 and December 15 of each year during which any Trust Notes — Series 2019-A are outstanding thereafter, until September 15, 2079.

“Person” is to be broadly interpreted and includes an individual, a corporation, a limited liability company, an unlimited liability company, a limited or general partnership, a trust, an unincorporated organization, a joint venture and any other organization, whether or not a legal entity, a government of a country or any political subdivision of a country or any agency or department of any such government and the executors, administrators or other legal representatives of a Person in such capacity.

“Privacy Laws” has the meaning ascribed thereto in Section 6.19.

“Series 2019-A Subscription Right” means the right granted by TCPL to the Trust to subscribe for TCPL Exchange Preferred Shares on the terms set forth in Article 4.

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“Series 2019-A Trust Estate” means collectively the rights and obligations of the Holders hereunder and pursuant hereto in respect of the Automatic Exchange, the covenants of TCPL contained in this Agreement and all money and other rights or assets that may be held from time to time by the Exchange Trustee pursuant hereto.

“Subscription Notice” has the meaning ascribed thereto in Section 4.2.

“Tax Act” means the Income Tax Act (Canada).

“TCE” means TC Energy Corporation and its successors and assigns.

“TCPL” means TransCanada PipeLines Limited and its successors and assigns.

“TCPL Common Shares” means the common shares of TCPL.

“TCPL Deferral Preferred Shares” means each series of first preferred shares issued by TCPL in connection with the Assignment and Set-Off Agreement.

“TCPL Exchange Preferred Share Provisions” means the rights, privileges, restrictions and conditions attaching to TCPL Exchange Preferred Shares, as set forth in Schedule A.

“TCPL Exchange Preferred Shares” means the applicable series of first preferred shares of TCPL authorized or to be authorized by the Board in connection herewith.

“TCPL Preferred Shares” means collectively all of the preferred shares of TCPL (including the TCPL Exchange Preferred Shares and TCPL Deferral Preferred Shares).

“Time of Automatic Exchange” has the meaning ascribed thereto in Section 3.4.

“Transfer Agent” means the transfer agent from time to time for TCPL Exchange Preferred Shares.

“Trust Indenture” means the Trust Indenture dated as of May 20, 2015, as supplemented by the third supplemental indenture dated the date hereof, and entered into between the Trust, the Indenture Trustee and TCPL providing for, inter alia, the creation and issuance of the Trust Notes — Series 2019-A, as the same may be amended, supplemented or restated from time to time.

“Trust Notes” means the Trust Notes — Series 2019-A and any other instruments representing subordinated unsecured debt obligations of the Trust as may be issued and outstanding under the Trust Indenture from time to time.

“Trust Notes — Series 2019-A” has the meaning ascribed thereto in the recitals to this Agreement.

“Trust Notes — Series 2019-A Provisions” means the rights, privileges, restrictions and conditions attaching to the Trust Notes — Series 2019-A, as set forth in the Trust Indenture.

“Trustee” means Computershare Trust Company, the trustee of the Trust, and includes any successor to it which may become trustee of the Trust in accordance with Section 7.4 of the Declaration of Trust.

“Voting Trust Units” has the meaning ascribed thereto in the recitals to this Agreement.

1.2Additional Definitions

In addition, unless the context otherwise requires, the definitions in the Declaration of Trust and the Trust Indenture apply to this Agreement.

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1.3Headings

The division of this Agreement into Articles, Sections and subsections and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this Agreement.

1.4Extended Meanings

In this Agreement words importing the singular number only shall include the plural and vice versa, and words importing gender include all genders.

1.5Date of Any Action

If any date on which any action is required to be taken under this Agreement is not a Business Day, such action shall be required to be taken on the next succeeding Business Day.

1.6Payments

All payments to be made hereunder shall be made without interest and less any tax required by law to be deducted and withheld as provided under Section 6.16.

1.7References to Statutes

Unless expressly stated otherwise, a reference to any statute shall be deemed to be a reference to that statute as in force from time to time, including any regulations, rules, policy statements, instruments or guidelines made under that statute, and to include any statute which may be enacted in substitution of that statute.

1.8Currency References

All references to dollar ($) amounts shall, unless otherwise expressly indicated herein, be to United States dollars.

1.9Rights of Set-Off

Each party may set-off against amounts owing by it hereunder to another Person any amounts owing or accruing due by such Person to it or any of its Affiliates, without duplication.

1.10Schedules

The following Schedule forms an integral part of this Agreement:

Schedule A       -       TCPL Exchange Preferred Share Provisions

ARTICLE 2
TRUST

2.1Establishment of Trust

The Exchange Trustee shall hold the Series 2019-A Trust Estate in order to enable the Exchange Trustee to exercise the rights and enforce the obligations thereunder, and shall hold the other rights granted in or resulting from the Exchange Trustee being a party to this Agreement in order to enable the Exchange Trustee to exercise or enforce such rights, in each case as trustee for and on behalf of the Holders of Trust Notes — Series 2019-A, as provided in this Agreement.  Except where the context otherwise requires, all references to the Exchange

5

Trustee hereunder shall be to the Exchange Trustee in its capacity as trustee for and on behalf of the Holders of Trust Notes — Series 2019-A.

ARTICLE 3
AUTOMATIC EXCHANGE

3.1Creation and Grant of Automatic Exchange

(a)TCPL hereby grants the Automatic Exchange together with its undertaking to, and covenants in favour of, the Exchange Trustee, as trustee for and on behalf of, and for the use and benefit of, the Holders of Trust Notes — Series 2019-A, to make the Automatic Exchange effective in accordance with and subject to the Trust Notes — Series 2019-A Provisions and the provisions of this Agreement. TCPL hereby acknowledges receipt from the Exchange Trustee, as trustee for and on behalf of the Holders of Trust Notes — Series 2019-A, of good and valuable consideration for such grant, undertaking and covenant and the sufficiency thereof.

(b)The Exchange Trustee, for and on behalf of the Holders of Trust Notes — Series 2019-A, hereby grants the Automatic Exchange together with its undertaking to, and covenants in favour of, TCPL to make the Automatic Exchange effective in accordance with and subject to the Trust Notes — Series 2019-A Provisions and the provisions of this Agreement. The Exchange Trustee, for and on behalf of the Holders of Trust Notes — Series 2019-A, hereby acknowledges receipt from TCPL of good and valuable consideration for such grant, undertaking and covenant and the sufficiency thereof.

(c)During the term of the trust created under this Agreement and subject to the terms and conditions of the Trust Notes — Series 2019-A Provisions and this Agreement, the Exchange Trustee shall possess and be vested with full legal right, entitlement and ownership to the rights arising from TCPL’s grant and covenant under Section 3.1(a) and the full power and authority of the Holders pursuant to and in accordance with the Trust Notes — Series 2019-A Provisions to perform the undertaking and covenant under Section 3.1(b).  The Exchange Trustee shall be entitled to exercise all of the related rights, privileges and powers of, under and with respect to the grant and covenant under Section 3.1(a), and to give effect to and perform the grant and covenant under Section 3.1(b), provided that the Exchange Trustee shall:

(i)hold the Automatic Exchange rights and the legal title thereto as trustee for and solely for the use and benefit of the Holders of Trust Notes — Series 2019-A and TCPL in accordance with and subject to the Trust Notes — Series 2019-A Provisions and this Agreement;

(ii)make the Automatic Exchange effective in accordance with and subject to the Trust Notes — Series 2019-A Provisions and this Agreement; and

(iii)except as specifically authorized by this Agreement, have no power or authority to exercise or otherwise deal in or with the Automatic Exchange rights and the Exchange Trustee shall not exercise any such rights for any purpose other than pursuant to this Agreement.

3.2Limitation

TCPL shall not at any time issue TCPL Exchange Preferred Shares except following an Automatic Exchange or pursuant to the Series 2019-A Subscription Right or in respect of any other series of Trust Notes.

6

3.3Automatic Exchange

On the occurrence of an Automatic Exchange Event, whether before or after the occurrence of any Event of Default (as defined in the Indenture), each Holder of Trust Notes — Series 2019-A then outstanding shall, through the Exchange Trustee, be deemed to have hereby automatically exchanged and transferred to TCPL all of such Holder’s right, title and interest in and to the Trust Notes — Series 2019-A, including pursuant to the guarantee provided by TCPL in respect of the Trust Notes — Series 2019-A, registered in its name at a price, for each $1,000 principal amount of Trust Notes — Series 2019-A, equal to one newly issued and fully paid TCPL Exchange Preferred Share with a stated issue price of $1,000 per share, together with such number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) calculated by dividing the amount of accrued and unpaid interest on each $1,000 principal amount of Trust Notes — Series 2019-A from the immediately preceding Interest Payment Date to, but excluding, the date of the Automatic Exchange Event, by $1,000.  As full and final payment of such price, a Holder of Trust Notes — Series 2019-A shall receive, and be deemed to have received, as of the Time of Automatic Exchange, the right to be issued one newly issued and fully paid TCPL Exchange Preferred Share which right shall be immediately and automatically exercised as provided in this section 3.3 with a stated issue price of $1,000 per share, together with such number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) calculated by dividing the amount of accrued and unpaid interest on each $1,000 principal amount of Trust Notes — Series 2019-A from the immediately preceding Interest Payment Date to, but excluding, the date of the Automatic Exchange Event by $1,000, per $1,000 principal amount of Trust Notes — Series 2019-A held by the Holder.  The foregoing exchange, transfer, receipt and acceptance shall be automatically effected hereby and shall not require any conveyance, confirmation or further action on the part of the Trust, the Exchange Trustee or the Holders in order to give full and final effect to same.  For greater certainty, any Trust Notes — Series 2019-A purchased or redeemed by the Trust prior to the Time of Automatic Exchange shall be deemed not to be outstanding and shall not be subject to the Automatic Exchange.

3.4Idem

As of 8:00 a.m. (Eastern time) on the day on which an Automatic Exchange Event occurs (the “Time of Automatic Exchange”), each Holder of Trust Notes — Series 2019-A shall be deemed to have exchanged and transferred to TCPL all of such Holder’s right, title and interest in and to the Trust Notes — Series 2019-A registered in its name and shall thereupon automatically cease to be a Holder of such Trust Notes — Series 2019-A and all rights of such Holder as a debtholder of the Trust, including pursuant to the guarantee provided by TCPL in respect of the Trust Notes — Series 2019-A, shall automatically cease, and each Holder shall thereupon and thereafter be deemed to be and for all purposes shall hereby be entitled to a right to be issued the corresponding number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) contemplated in Section 3.3. TCPL shall deliver to the Exchange Trustee a written notice (the “Automatic Exchange Event Notice”), which shall be binding on the Holders of the Trust Notes — Series 2019-A, signed by any Authorized Officer, of the occurrence of an Automatic Exchange within 10 days after the occurrence of such event and, as soon as practicable following receipt by the Exchange Trustee from TCPL, the Exchange Trustee shall deliver notice to the Holders of Trust Notes — Series 2019-A of the occurrence of the Automatic Exchange; provided, however, that a failure to make such delivery shall not affect, reduce or modify in any way the effectiveness of the Automatic Exchange with effect as of the Time of Automatic Exchange.

3.5Procedure

Following the occurrence of an Automatic Exchange, the Trust shall, as soon as reasonably practicable, inform TCPL and the Exchange Trustee by notice in writing (the “Exchange Notice”) as to the number of Trust Notes — Series 2019-A exchanged and transferred hereby.  Such Exchange Notice shall specify the number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) required in connection with the Automatic Exchange in accordance with the Trust Notes — Series 2019-A Provisions and shall specify whether, to the knowledge of the Trust, such Holders of Trust Notes — Series 2019-A (or Persons beneficially owning Trust Notes — Series 2019-A represented by the Holders of such Trust Notes — Series 2019-A) are Ineligible

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Persons. As a precondition to the delivery of any certificate or other evidence of issuance representing any TCPL Exchange Preferred Shares or related rights following an Automatic Exchange, TCPL may require the Trust to obtain from any Holder of Trust Notes — Series 2019-A (and Persons holding Trust Notes — Series 2019-A represented by such Holder of Trust Notes — Series 2019-A) a declaration, in form and substance satisfactory to TCPL, confirming compliance with any applicable regulatory requirements and to establish that such Holder of Trust Notes — Series 2019-A is not, and does not represent, an Ineligible Person. The Trustee shall be entitled to rely exclusively on the declaration of the Holder. Subject as aforesaid, TCPL shall, as soon as practicable following receipt of the Exchange Notice, arrange for delivery to the Clearing Agency (if the Trust Notes — Series 2019-A were, on the date of the Exchange Notice, held only in the Book-Entry System) or to the Trust (in all other cases) of a certificate or other evidence of issuance representing that number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) or related rights, as applicable. In no event shall TCPL be required as a consequence of an Automatic Exchange to issue a number of TCPL Exchange Preferred Shares in excess of the number contemplated in Section 3.3 or in excess of the number required to enable the Trust to fulfil its obligations in connection with the redemption of Trust Notes — Series 2019-A in the circumstances described in Article 4. For greater certainty, a failure to give any notice, make any determination or make any delivery shall not affect, reduce or modify in any way the effectiveness of the Automatic Exchange with effect as of the Time of Automatic Exchange.

ARTICLE 4
SERIES 2019-A SUBSCRIPTION RIGHT

4.1Grant of Series 2019-A Subscription Right

Subject to the provisions of this Article 4, TCPL hereby grants to the Trust the right to subscribe at any time for such number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) as may be necessary in order to enable the Trust to redeem, for TCPL Exchange Preferred Shares, Trust Notes — Series 2019-A, if any, that remain outstanding following the occurrence of an Automatic Exchange Event, as provided for herein and in the Trust Indenture. Such TCPL Exchange Preferred Shares shall be issued by TCPL to the Trust solely for the purpose of the Trust giving effect to a redemption of any such outstanding Trust Notes — Series 2019-A following the Automatic Exchange Event.

4.2Series 2019-A Subscription Right—Procedure

Following the occurrence of an Automatic Exchange Event in circumstances where, for any reason, any Trust Notes — Series 2019-A remain outstanding and are not owned by TCPL or an Affiliate thereof, the Trust shall, as soon as reasonably practicable, inform TCPL and the Exchange Trustee by notice in writing (the “Subscription Notice”) as to such number of outstanding Trust Notes — Series 2019-A.  The Subscription Notice shall specify such number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) as would be required to enable the Trust to fulfil its obligations in connection with the redemption by the Trust of such number of outstanding Trust Notes — Series 2019-A in accordance with the Trust Notes — Series 2019-A Provisions and shall specify whether, to the knowledge of the Trust, such Holders of Trust Notes — Series 2019-A (or Persons holding Trust Notes — Series 2019-A represented by the Holders of such Trust Notes — Series 2019-A) are Ineligible Persons. As a precondition to the issuance of any TCPL Exchange Preferred Shares to the Trust pursuant to the exercise by the Trust of the Series 2019-A Subscription Right, TCPL may require the Trust to obtain from any Holder of Trust Notes — Series 2019-A (and Persons holding Trust Notes — Series 2019-A represented by such Holder of Trust Notes — Series 2019-A) a declaration, in form and substance satisfactory to TCPL, confirming compliance with applicable regulatory requirements and to establish that such Holder of Trust Notes — Series 2019-A is not, and does not represent, an Ineligible Person. The Trustee shall be entitled to rely exclusively on the declaration of the Holder or the direction of a written order by TCPL, and the Trustee shall have no obligation to monitor with respect to Ineligible Persons. Subject to Section 5.7, TCPL shall, as soon as practicable following receipt of the Subscription Notice, arrange for delivery to the Clearing Agency (if the Trust Notes — Series 2019-A were, on the date of the Subscription Notice, held only in the Book-Entry System) or to the Trust (in all other cases) of that number of TCPL Exchange Preferred Shares (including

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fractional shares, if applicable), as applicable, so as to enable the Trust to discharge its redemption obligations in accordance with the Trust Notes — Series 2019-A Provisions.

4.3Idem

The Trust need not give notice of redemption prior to the exercise of such right of redemption if TCPL has given an Automatic Exchange Event Notice. The redemption shall be and shall be deemed to have been effected and the consideration paid at the Time of Automatic Exchange. From and after the Time of Automatic Exchange, each Holder of Trust Notes — Series 2019-A (if any) whose Trust Notes — Series 2019-A were for any reason not exchanged for TCPL Exchange Preferred Shares by the operation of the Automatic Exchange and instead are subject to redemption by the Trust under this Agreement and in accordance with the Trust Notes — Series 2019-A Provisions, shall automatically cease to be a Holder of Trust Notes — Series 2019-A effective as of the Time of Automatic Exchange and instead shall be entitled only to the right to be issued TCPL Exchange Preferred Shares in respect of such redemption of Trust Notes — Series 2019-A held by such Holder in accordance with the Trust Notes — Series 2019-A Provisions.

ARTICLE 5
COVENANTS, REPRESENTATIONS AND WARRANTIES

5.1Certain Representations

TCPL hereby represents, warrants and covenants that it has: (i) authorized for issuance and will, at all times, keep available, free from pre-emptive and other rights, out of its authorized and unissued share capital, such number of TCPL Exchange Preferred Shares as may be required for TCPL to meet its obligations to issue TCPL Exchange Preferred Shares following the occurrence of the Automatic Exchange and in connection with the Series 2019-A Subscription Right; and (ii) taken all necessary corporate action to enable TCPL to issue TCPL Exchange Preferred Shares after the Automatic Exchange and in connection with the Series 2019-A Subscription Right.

5.2Notification of Certain Events

In order to assist TCPL and the Exchange Trustee to comply with their respective obligations hereunder, the Trust shall give TCPL and the Exchange Trustee notice of each of the following events at the times set forth below:

(a)any determination by the Trust to institute voluntary termination proceedings with respect to the Trust or to effect any other distribution of the assets of the Trust among its security holders for the purpose of winding-up its affairs, at least 60 days prior to the proposed effective date of such termination;

(b)immediately, upon the earlier of: (i) receipt by the Trust of notice of; and (ii) the Trust otherwise becoming aware of, any threatened or instituted claim, suit, petition or other proceedings with respect to the involuntary termination of the Trust or to effect any other distribution of the assets of the Trust among its security holders for the purpose of winding-up its affairs; and

(c)immediately upon the Trust making any determination to exercise any rights to redeem Trust Notes — Series 2019-A following the Automatic Exchange.

5.3Qualification of TCPL Exchange Preferred Shares

TCPL covenants that if any TCPL Exchange Preferred Shares to be issued and delivered hereunder or pursuant to the TCPL Exchange Preferred Share Provisions or the Trust Notes — Series 2019-A Provisions require registration or qualification with or approval of or the filing of any document, including any prospectus or similar document, or the taking of any proceeding with or the obtaining of any order, ruling, approval or

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consent from any governmental or regulatory authority under any Canadian or United States federal or provincial or state, as applicable, law or regulation or pursuant to the rules and regulations of any Canadian or United States regulatory authority or the fulfilment of any other legal requirement (collectively, the “Applicable Laws”) before such TCPL Exchange Preferred Shares may be issued and delivered by TCPL to the Trust, the Exchange Trustee or the Holders following the Automatic Exchange, the Series 2019-A Subscription Right or the TCPL Exchange Preferred Share Provisions, as the case may be, or in order that such TCPL Exchange Preferred Shares may be freely traded thereafter (except for any restrictions on ownership or transfer by reason of any Holder of TCPL Exchange Preferred Shares being a “control person” of TCPL for purposes of Canadian securities laws or by reason of any TCPL Exchange Preferred Shares being “control securities” for the purposes of United States securities laws), TCPL shall, in good faith, expeditiously take all such actions and do all such things as are necessary to cause such TCPL Exchange Preferred Shares to be duly registered, qualified or approved as and to the extent required for such purpose pursuant to Applicable Laws. TCPL represents and warrants that it has taken all actions and done all things as are necessary under Applicable Laws as they exist on the date hereof to cause the TCPL Exchange Preferred Shares to be issued and delivered in accordance with the provisions of this Agreement, the TCPL Exchange Preferred Share Provisions and the Trust Notes — Series 2019-A Provisions and to be freely tradable thereafter by the initial holder thereof, subject to the exceptions referred to above in this Section 5.3 provided, however, that a failure to take such actions and/or to do such things shall not affect, reduce or modify in any way the effectiveness of the Automatic Exchange as of the Time of Automatic Exchange.

5.4TCPL Support

So long as any Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares are outstanding, TCPL shall perform all of the obligations to be performed by it hereunder following the Automatic Exchange, in connection with the Series 2019-A Subscription Right and pursuant to the TCPL Exchange Preferred Share Provisions, as applicable, and shall exercise all of its rights with respect thereto in accordance with the Declaration of Trust, the Trust Indenture and the terms of this Agreement. All TCPL Exchange Preferred Shares issued by TCPL following the Automatic Exchange or in connection with the Series 2019-A Subscription Right, as the case may be, shall be duly issued as fully paid and non-assessable shares in the capital of TCPL, free of pre-emptive rights and shall be free and clear of any lien, claim, encumbrance, security interest or adverse claim. Without limiting the generality of the immediately preceding sentence, TCPL covenants that it shall, in a timely manner, transfer or arrange to transfer to such account of the Trust or the Exchange Trustee, as the case may be, in the Book-Entry System of the Clearing Agency as the Trust or the Exchange Trustee, as the case may be, may direct, from time to time, the appropriate number of TCPL Exchange Preferred Shares (including fractional shares, if applicable), and supply the Trust or the Exchange Trustee, as the case may be, with duly executed share certificates, as applicable, so as to give effect, from time to time, to the issuance of TCPL Exchange Preferred Shares following the Automatic Exchange, in connection with the Series 2019-A Subscription Right or pursuant to the TCPL Exchange Preferred Share Provisions, as the case may be, in accordance with the Trust Notes — Series 2019-A Provisions, the TCPL Exchange Preferred Share Provisions and the provisions of this Agreement.

5.5Additional TCPL Covenants

For so long as any Trust Notes — Series 2019-A are outstanding and are held by any Person other than TCPL or an Affiliate thereof, TCPL covenants as follows for the benefit of the Holders of Trust Notes — Series 2019-A:

(a)all outstanding Voting Trust Units shall be held at all times, directly or indirectly, by TCPL;

(b)TCPL shall not approve the termination of the Trust unless the Trust has sufficient funds to pay to Holders of Trust Notes — Series 2019-A the redemption price for the Trust Notes — Series 2019-A as provided in the Trust Notes — Series 2019-A Provisions, and as long as any Trust Notes — Series 2019-A are outstanding and held by any Person other than TCPL or an Affiliate thereof, TCPL shall not take any action to cause the termination of the Trust;

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(c)TCPL shall not create or issue TCPL Preferred Shares which, in the event of insolvency or winding-up of TCPL, would rank in right of payment in priority to the TCPL Exchange Preferred Shares;

(d)if the Trust Notes — Series 2019-A have not been exchanged for rights to be issued TCPL Exchange Preferred Shares pursuant to the Automatic Exchange, TCPL shall not, without the prior consent of Holders of Trust Notes — Series 2019-A by Extraordinary Resolution, amend, delete or vary any of the rights, privileges, restrictions and conditions attaching to the TCPL Exchange Preferred Shares other than amendments, deletions or variations which do not negatively impact future holders of TCPL Exchangeable Preferred Shares and other than amendments that relate to the preferred shares of TCPL as a class; and

(e)TCPL shall not assign or otherwise transfer its obligations under this Agreement except in the case of a merger, consolidation, amalgamation or reorganization or sale of substantially all of the assets of TCPL.

5.6Capital Reorganizations and Amalgamations of TCPL

In the event of a capital reorganization, consolidation, merger or amalgamation or sale of substantially all of the assets of TCPL or comparable transaction affecting TCPL Exchange Preferred Shares, TCPL covenants to take all necessary action to ensure that the Trust or Holders of Trust Notes — Series 2019-A, as the case may be, receive, following the Automatic Exchange or in connection with the Series 2019-A Subscription Right, as the case may be, after such capital reorganization, consolidation, merger, amalgamation or sale of substantially all assets or comparable transaction, the number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) or other securities or consideration of TCPL or an entity resulting, surviving or continuing from the capital reorganization, consolidation, merger, amalgamation or sale of substantially all assets or comparable transaction that the Trust or such Holder of Trust Notes — Series 2019-A would have received if the Series 2019-A Subscription Right was exercised or if the TCPL Exchange Preferred Shares were issued following the Automatic Exchange, as the case may be, immediately prior to the record date of the capital reorganization, consolidation, merger, amalgamation or sale of substantially all assets or comparable transaction.

5.7Right not to Deliver TCPL Exchange Preferred Shares

The parties acknowledge that, as set out in the Trust Indenture, TCPL has reserved the right not to deliver TCPL Exchange Preferred Shares to any Ineligible Person following an Automatic Exchange or in connection with a redemption of the Trust Notes — Series 2019-A following an Automatic Exchange Event.  In those circumstances, the Indenture Trustee will hold all TCPL Exchange Preferred Shares that would otherwise be delivered to the Ineligible Persons and will deliver such shares to a broker retained by TCPL for the purpose of effecting the sale (to parties other than TCPL, its Affiliates or any Ineligible Persons) on behalf of such Ineligible Persons.  Those sales (if any) may be made at any time and at any price and none of the Trust, the Indenture Trustee or TCPL will be subject to any liability for failing to sell such TCPL Exchange Preferred Shares on behalf of any such Ineligible Persons or at any particular price on any particular day.  The net proceeds received by the Indenture Trustee from the sale of any such TCPL Exchange Preferred Shares will be divided among the Ineligible Persons in proportion to the number of TCPL Exchange Preferred Shares (including fractional shares, if applicable) that would otherwise have been delivered to them, after deducting the costs of sale and any applicable withholding taxes.  The Indenture Trustee will make payment of the aggregate net proceeds to the Clearing Agency (if the TCPL Exchange Preferred Shares are then held in the Book-Entry System) or to the registrar or transfer agent (in all other cases) for distribution to such Ineligible Persons in accordance with the customary practice and procedures of the Clearing Agency or otherwise.

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ARTICLE 6
EXCHANGE TRUSTEE

6.1Powers and Duties of Exchange Trustee

The rights, powers, duties and authorities of the Exchange Trustee under this Agreement, in its capacity as Exchange Trustee, are as follows:

(a)receiving and holding the Automatic Exchange and TCPL’s undertaking and covenant in relation to the Automatic Exchange as trustee and effecting the Holder’s related undertaking and covenant for and on behalf of each applicable Holder, in each case in accordance with the provisions of this Agreement;

(b)acting for and on behalf of the Holders of Trust Notes — Series 2019-A to implement and make effective the undertaking and covenant of the Holders with respect to the Automatic Exchange pursuant to Section 3.3;

(c)enforcing the benefit of and making effective the Automatic Exchange rights in accordance with the Trust Notes — Series 2019-A Provisions and this Agreement and, in connection therewith, receiving from Holders certificates representing Trust Notes — Series 2019-A and other requisite documents and distributing or causing to be distributed to such Holders TCPL Exchange Preferred Shares, and cheques, if any, to which such Holders may become entitled hereunder in connection with an Automatic Exchange;

(d)holding and administering the Series 2019-A Trust Estate in accordance with the terms of this Agreement;

(e)investing any money forming, from time to time, part of the Series 2019-A Trust Estate as provided in this Agreement;

(f)subject to Article 6, taking action at the direction of any Holder to enforce the obligations of the Trust or TCPL under this Agreement; and

(g)taking such other actions and doing such other things as are specifically provided for in this Agreement.

In the exercise of such rights, powers, duties and authorities, the Exchange Trustee shall have (and is granted) such incidental and additional rights, powers and authority not in conflict with any of the provisions of this Agreement, the Trust Notes — Series 2019-A Provisions and the TCPL Exchange Preferred Share Provisions relating to the Exchange Trustee as are reasonably required for the Exchange Trustee to carry out its duties under this Agreement. Any exercise of such discretionary rights, powers and authorities by the Exchange Trustee shall be final, conclusive and binding upon all Persons. For greater certainty, with respect to the Trust Notes — Series 2019-A and the TCPL Exchange Preferred Shares, the Exchange Trustee shall have only those duties as are set out specifically in this Agreement. The Exchange Trustee, in exercising its rights, powers, duties and authorities hereunder, shall act honestly and in good faith with a view to the best interests of the Holders and shall exercise the care, diligence and skill that a reasonably prudent trustee, nominee and agent would exercise in comparable circumstances. The Exchange Trustee shall not be bound to give any notice or do or take any act, action or proceeding by virtue of the powers conferred on it hereby unless and until it shall be specifically required to do so under the terms hereof; nor shall the Exchange Trustee be required to take any notice of, or to do or to take any act, action or proceeding as a result of any default or breach of any provision hereunder, unless and until notified in writing of such default or breach, which notice shall specify the default or breach desired to be brought to the attention of the Exchange Trustee, and in the absence of such notice the Exchange Trustee may for all purposes of this Agreement conclusively assume that no default or breach has been made in the observance or

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performance of any of the representations, warranties, covenants, agreements or conditions contained in this Agreement.

6.2No Conflict of Interest

The Exchange Trustee represents to the Trust and TCPL that, at the date of execution and delivery of this Agreement, there exists no material conflict of interest in the role of the Exchange Trustee as a fiduciary hereunder. The Exchange Trustee shall, within 90 days after it becomes aware that such a material conflict of interest exists, either eliminate such material conflict of interest or resign in the manner and with the effect specified in Article 9. If, notwithstanding the foregoing provisions of this Section 6.2, the Exchange Trustee has such a material conflict of interest, the validity and enforceability of this Agreement shall not be affected in any manner whatsoever by reason only of the existence of such material conflict of interest. If the Exchange Trustee contravenes the foregoing provisions of this Section 6.2, any interested party may apply to the Superior Court of Justice (Ontario) for an order that the Exchange Trustee be replaced under this Agreement.

6.3Dealings with Transfer Agents, Registrars and the Clearing Agency

The Trust and TCPL severally and irrevocably authorize the Exchange Trustee, from time to time, to:

(a)consult, communicate and otherwise deal with the Indenture Trustee and the respective registrars and transfer agents, and any such subsequent registrar or transfer agent, of the Trust Notes — Series 2019-A and TCPL Exchange Preferred Shares;

(b)if applicable, consult, communicate and otherwise deal with the Clearing Agency; and

(c)requisition, from time to time, from the Indenture Trustee or any such registrar or transfer agent or the Clearing Agency any information readily available from the records maintained by any such entity which the Exchange Trustee may reasonably require for the discharge of its duties and responsibilities under the Trust Notes — Series 2019-A Provisions, the TCPL Exchange Preferred Share Provisions and this Agreement.

6.4Books and Records

The Exchange Trustee shall keep available for inspection by TCPL and the Trust, at the Exchange Trustee’s principal office in Calgary, Alberta, correct and complete books and records of account relating to the Exchange Trustee’s actions under this Agreement. On or before March 1 in every year, the Exchange Trustee shall transmit to TCPL and the Trust a brief report, dated as of December 31 in the immediately preceding year, with respect to: (i) the Series 2019-A Trust Estate as of that date; and (ii) all other actions taken by the Exchange Trustee in the performance of its duties under this Agreement which it had not previously reported.

6.5Indemnification Prior to Certain Actions by Exchange Trustee

Notwithstanding any other provision of this Agreement, the Exchange Trustee shall only be required to exercise any or all of the rights, duties, powers or authorities vested in it by this Agreement at the written request, order or direction of any Holder upon such Holder furnishing to the Exchange Trustee reasonable funds, security and indemnity satisfactory to the Exchange Trustee, acting reasonably, against the costs, expenses and liabilities that may be incurred by the Exchange Trustee therein or thereby, provided that no Holder will be obligated to furnish to the Exchange Trustee any such funding, security or indemnity in connection with the exercise, but not the enforcement, by the Exchange Trustee of any of its rights, duties, powers and authorities vested in it by this Agreement. None of the provisions contained in this Agreement shall require the Exchange Trustee to expend or risk its own funds or otherwise incur financial liability in the exercise of any of its rights, powers, duties or authorities under this Agreement nor limits the Exchange Trustee, acting reasonably, from requesting an indemnity, before any enforcement of rights.  In addition, the Exchange Trustee shall disburse funds only to the extent that funds have been deposited with it.

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6.6Actions by Holders

No Holder shall have the right to institute any action, suit or proceeding or to exercise any other remedy authorized by this Agreement for the purpose of enforcing any of its rights or for the execution of any trust, power or obligation hereunder unless the Holder has requested in writing the Exchange Trustee to take or institute such action, suit or proceeding and, subject to Section 6.5, furnished the Exchange Trustee with the funding, security and indemnity referred to in Section 6.5, and the Exchange Trustee shall have failed to act within a reasonable time thereafter. In such case, but not otherwise, the Holder shall be entitled to take proceedings in any court of competent jurisdiction, it being understood and intended that no one or more Holders shall have any right in any manner whatsoever to affect, disturb or prejudice the rights hereby created by any such action, or to enforce any right hereunder, except subject to the conditions and in the manner herein provided, and that all powers and trusts hereunder shall be exercised and all proceedings at law shall be instituted, had and maintained by the Exchange Trustee, except only as herein provided, and in any event for the benefit of all Holders.

6.7Reliance upon Declarations

The Exchange Trustee shall not be considered to be in contravention of any of its rights, powers, duties and authorities hereunder if, when required, it acts and relies in good faith upon written notices, statutory declarations, certificates, opinions, reports or other papers or documents furnished pursuant to the provisions hereof, the Trust Notes — Series 2019-A Provisions or the TCPL Exchange Preferred Share Provisions or required by the Exchange Trustee to be furnished to it in the exercise of its rights, powers, duties and authorities hereunder and such notices, statutory declarations, certificates, opinions, reports or other papers or documents comply with this Agreement, nor shall the Exchange Trustee be responsible for relying on the accuracy of the information contained in any such document provided it honestly and in good faith believes such information to be correct.  The Exchange Trustee shall not be responsible or liable in any manner for the sufficiency, genuineness, correctness or validity of any security deposited with it.

6.8Evidence and Authority to Exchange Trustee

The Trust and/or TCPL shall furnish to the Exchange Trustee evidence of compliance with the conditions provided for in this Agreement relating to any action or step required or permitted to be taken by the Trust and/or TCPL or the Exchange Trustee under this Agreement, the Trust Notes — Series 2019-A Provisions, the TCPL Exchange Preferred Share Provisions or as a result of any obligation or duty imposed under this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Exchange Preferred Share Provisions, including in respect of the Automatic Exchange and the Series 2019-A Subscription Right and the taking of any other action to be taken by the Exchange Trustee, at the request of or on the application of the Trust and/or TCPL forthwith if and when:

(a)such evidence is required by any other provision of this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Exchange Preferred Share Provisions to be furnished to the Exchange Trustee in accordance with this Section 6.8; or

(b)the Exchange Trustee, in the exercise of its rights, powers, duties and authorities under this Agreement, the Trust Notes — Series 2019-A Provisions or the TCPL Exchange Preferred Share Provisions, gives the Trust and/or TCPL written notice requiring it to furnish such evidence in relation to any particular action or obligation specified in such notice.

Such evidence shall consist of a certificate signed by an Authorized Officer and/or by or on behalf of the Trust by an authorized signatory of the Administrative Agent or a statutory declaration stating that any such condition has been complied with in accordance with the terms of this Agreement and the Trust Notes — Series 2019-A Provisions or the TCPL Exchange Preferred Share Provisions, as applicable. Such evidence may consist of a report or opinion of any solicitor, auditor, accountant, appraiser, valuator or other expert or any other Person whose qualifications give authority to a statement made by such Person, provided that if such report or opinion is furnished by TCPL and/or by or on behalf of the Trust by an authorized signatory of the Administrative Agent

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it shall be in the form of a certificate or a statutory declaration. Each statutory declaration, certificate, opinion or report furnished to the Exchange Trustee as evidence of compliance with a condition provided for in this Agreement, the Trust Notes — Series 2019-A Provisions or TCPL Exchange Preferred Share Provisions, as applicable, shall include a statement by the Person giving the evidence:

(c)declaring that such Person has read and understands the provisions of this Agreement, the Trust Notes — Series 2019-A Provisions and/or the TCPL Exchange Preferred Share Provisions, as applicable, relating to the condition in question;

(d)describing the nature and scope of the examination or investigation upon which such Person based the statutory declaration, certificate, statement or opinion; and

(e)declaring that such Person has made such examination or investigation as such Person believes is necessary to enable such Person to make the statements or give the opinions contained or expressed therein.

6.9Experts, Advisers and Agents

The Exchange Trustee may:

(a)in relation to this Agreement, the Trust Notes — Series 2019-A Provisions and/or the TCPL Exchange Preferred Share Provisions, act and rely on the opinion or advice of, or information obtained from or prepared by, any solicitor, auditor, accountant, appraiser, valuator or other expert, whether retained by the Exchange Trustee or by the Trust and/or TCPL or otherwise, and may retain or employ such assistants as may be necessary to the proper determination and discharge of its powers, duties and obligations and the determination of its rights hereunder and may pay proper and reasonable compensation for all such legal and other advice or assistance as aforesaid; and

(b)retain or employ such agents and other assistants as it may reasonably require for the proper determination and discharge of its powers and duties hereunder, and may pay reasonable remuneration for all services performed for it (and shall be entitled to receive reasonable remuneration for all services performed by it) in the discharge of its duties hereunder and compensation for all disbursements, costs and expenses made or incurred by it in the determination and discharge of its duties hereunder.

6.10Investment of Money Held by or on behalf of Exchange Trustee

(a)Unless otherwise provided in this Agreement, any moneys held by or on behalf of the Exchange Trustee, which under the terms of this Agreement may or ought to be invested or which may be on deposit with the Exchange Trustee or which may be in the hands of the Exchange Trustee, may be invested and reinvested in the name or under the control of the Exchange Trustee, upon the written direction of the Trust, in Authorized Investments.

(b)Upon receipt of a direction from the Trust, the Exchange Trustee shall invest any moneys held by it in Authorized Investments in its name in accordance with such direction. Any direction from the Trust to the Exchange Trustee shall be in writing and shall be provided to the Exchange Trustee no later than 9:00 a.m. (Toronto time) on the day on which the investment is to be made. Any such direction received by the Exchange Trustee after 9:00 a.m. (Toronto time) or received on a non-Business Day shall be deemed to have been given prior to 9:00 a.m. (Toronto time) on the next Business Day.

(c)In the event that the Exchange Trustee does not receive a direction or only a partial direction, the Exchange Trustee may hold cash balances constituting part or all of the funds and may, but

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need not, invest same in the deposits of a Canadian chartered bank; but the Exchange Trustee and its Affiliates shall not be liable to account for any profit to any parties to this Agreement or to any Person other than at a rate, if any, established from time to time by the Exchange Trustee or its Affiliates or a Canadian chartered bank.

(d)The Exchange Trustee shall not be liable for any loss or losses realized on such investments, other than those related to the negligence, willful acts or defaults of the Exchange Trustee.

6.11Exchange Trustee Not Required to Give Security

The Exchange Trustee shall not be required to give any bond or security in respect of the execution of the trusts, rights, duties, obligations, powers and authorities of this Agreement.

6.12Exchange Trustee Not Bound to Act on Request

Except as otherwise specifically provided for in this Agreement, the Exchange Trustee shall not be required to act in accordance with any direction or request of the Trust and/or TCPL until a duly authenticated copy of the instrument or resolution containing such direction or request shall have been delivered to the Exchange Trustee, and the Exchange Trustee shall be empowered to act and rely upon any such copy purporting to be authenticated and believed in good faith by the Exchange Trustee to be genuine.

6.13Authority to Carry on Business

The Exchange Trustee represents to the Trust and/or TCPL that, at the date of execution and delivery by it of this Agreement, it is authorized to carry on the business of a trust company in the Province of Ontario but if, notwithstanding the provisions of this Section 6.13, it ceases to be so authorized to carry on business, the validity and enforceability of this Agreement, and the other rights granted in or resulting from the Exchange Trustee being a party to this Agreement, shall not be affected in any manner whatsoever by reason only of such event, but the Exchange Trustee shall, within 90 days after ceasing to be authorized to carry on the business of a trust company in the Province of Ontario, either become so authorized or resign in the manner and with the effect specified in Article 9.

6.14Conflicting Claims

If conflicting claims or demands are made or asserted with respect to any interest of any Holder in any Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares, including any disagreement between the heirs, representatives, successors or assigns succeeding to all or any part of the interest of any Holder in any Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares resulting in conflicting claims or demands being made in connection with such interest, then the Exchange Trustee shall be entitled, at its sole discretion, to refuse to recognize or to comply with any such claim or demand. In so refusing, the Exchange Trustee may elect not to exercise any rights subject to such conflicting claims or demands and, in so doing, the Exchange Trustee shall not be or become liable to any Person on account of such election or its failure or refusal to comply with any such conflicting claims or demands. The Exchange Trustee shall be entitled to continue to refrain from acting and to refuse to act until:

(a)the rights of all adverse claimants or other rights subject to such conflicting claims or demands have been adjudicated by a final judgment of a court of competent jurisdiction; or

(b)all differences or other rights subject to such conflicting claims or demands have been conclusively settled by a valid written agreement binding on all such adverse claimants, and the Exchange Trustee shall have been furnished with an executed copy of such agreement.

If the Exchange Trustee elects to recognize any claim or comply with any demand made by any such adverse claimant, it may in its discretion require such claimant to furnish such surety bond or other security satisfactory

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to the Exchange Trustee as it may deem appropriate to fully indemnify it as between all conflicting claims or demands.

6.15Acceptance by Exchange Trustee

The Exchange Trustee hereby accepts the trust and duties created and provided for by and in this Agreement and agrees to perform the same upon the terms and conditions herein set forth and to hold all rights, privileges and benefits conferred hereby and by law, in trust, for TCPL and various Persons who are from time to time Holders of Trust Notes — Series 2019-A, subject to all the terms and conditions herein set forth.

6.16Withholding Tax

TCPL or the Exchange Trustee may deduct or withhold (or such amount shall be deducted or withheld in accordance with the customary practice and procedures of the Clearing Agency) from any payment, distribution or delivery to any Holder amounts required or permitted by law to be deducted or withheld from such Holder’s distribution, payment or delivery and shall remit such amounts to the relevant tax authority in the manner and within the time required by law. Where the cash component of any payment, distribution or delivery to be made to a Holder is less than the amount that TCPL or the Exchange Trustee is required or permitted to withhold, TCPL or the Exchange Trustee shall be permitted to withhold from any non-cash payment, distribution or delivery to be made to the Holder and to dispose or arrange to dispose of such property in order to remit any amount to the relevant tax authority as required. TCPL shall provide written direction to the Exchange Trustee as to such amounts to be deducted or withheld; provided, however, that the Exchange Trustee shall deduct or withhold from any Holder’s distribution or delivery any amount it is required by law to deduct and withhold, and shall remit such amount to the relevant tax authority in the manner and within the time required by law, notwithstanding the failure of TCPL to provide any such direction following a request therefor from the Exchange Trustee, and in so doing the Exchange Trustee shall be deemed to have complied with its obligations hereunder. The Exchange Trustee shall file in the manner and within the time required by law any required tax returns and provide any required information slips relating to such withholding or deduction.

6.17Residency of Exchange Trustee

The Exchange Trustee hereby represents that it is a resident of Canada for the purposes of the Tax Act and the Exchange Trustee shall give the Trust and TCPL notice of any change in such status.

6.18Tax Reports

The Trust shall be solely responsible for all tax processing relating to or arising from the duties or actions contemplated by this Agreement, including any inquiry, evaluation, reporting, remittance, filing and issuance of tax slips, summaries, reports, except as is specifically delegated to the Indenture Trustee pursuant to this Agreement or as may be agreed subsequently, as confirmed in writing by the parties.

The Exchange Trustee shall process only such tax matters as have been specifically delegated to it pursuant to this Agreement or as may be agreed subsequently, and in doing so, the Exchange Trustee does not undertake to carry out any inquiry, evaluation, reporting, remittance, filing or issuance of tax slips, summaries and reports necessary or incidental thereto, which shall remain the sole responsibility of the Trust. The Exchange Trustee shall be entitled to rely upon and assume, without further inquiry or verification, the accuracy and completeness of any tax processing information, documentation or instructions received by the Exchange Trustee, directly or indirectly, from or on behalf of the Trust.

6.19Compliance with Privacy Legislation

The parties acknowledge that federal, provincial and/or state legislation in Canada or the United States that address the protection of individuals’ personal information (collectively, “Privacy Laws”) may apply to obligations and activities under this Agreement. Despite any other provision of this Agreement, no party shall

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take or direct any action that would contravene, or cause any other party to contravene, applicable Privacy Laws. The Exchange Trustee shall use commercially reasonable efforts to ensure that its services hereunder comply with Privacy Laws.  Specifically, the Exchange Trustee agrees: (a) to have a designated chief privacy officer; (b) to maintain policies and procedures to protect personal information and to receive and respond to any privacy complaint or inquiry; (c) to use personal information solely for the purposes of providing its services under or ancillary to this Agreement and not to use it for any other purpose except with the consent of or direction from the Trust and TCPL or the individual involved; (d) not to sell or otherwise improperly disclose personal information to any third party; and (e) to employ administrative, physical and technological safeguards to reasonably secure and protect personal information against loss, theft, or unauthorized access, use or modification.

6.20Compliance with Anti-Money Laundering Legislation

The Exchange Trustee shall retain the right not to act and shall not be liable for refusing to act if, due to a lack of information or for any other reason whatsoever, the Exchange Trustee, in its sole judgment, determines that such act might cause it to be in non-compliance with any applicable anti-money laundering or anti-terrorist legislation, regulation or guideline.

ARTICLE 7
COMPENSATION

7.1Fees and Expenses of Exchange Trustee

The Trust and TCPL jointly and severally agree to pay to the Exchange Trustee reasonable compensation for all of the services rendered by it under this Agreement and shall reimburse the Exchange Trustee for all reasonable expenses incurred by it in connection therewith (including, but not limited to, taxes and compensation paid to experts, counsel and advisors and disbursements, including the cost and expense of any suit or litigation of any character and any proceedings before any governmental agency reasonably incurred by the Exchange Trustee); provided that the Trust and TCPL shall have no obligation to reimburse the Exchange Trustee for any expenses or disbursements paid, incurred or suffered by the Exchange Trustee in any suit or litigation in which the Exchange Trustee is determined to have acted with fraud, negligence or wilful misconduct. For administrative purposes, the Exchange Trustee may invoice TCPL unless instructed otherwise.

ARTICLE 8
INDEMNIFICATION AND LIMITATION OF LIABILITY

8.1Indemnification of Exchange Trustee

The Trust and TCPL jointly and severally agree to indemnify and hold harmless the Exchange Trustee and each of its directors, officers, employees, representatives and agents appointed and acting in accordance with this Agreement (collectively, the “Indemnified Parties”) against all claims, losses, damages, costs, penalties, fines, taxes, assessments of additional taxes, interest or penalties or other governmental charges, including the withholding or deduction or the failure to withhold or deduct same, any liability for failure to obtain proper certifications or to properly report to government authorities, and reasonable expenses (including reasonable expenses of the Exchange Trustee’s legal counsel) which, without fraud, negligence or wilful misconduct on the part of such Indemnified Party, are paid, incurred or suffered by the Indemnified Party by reason of or as a result of the Exchange Trustee’s acceptance or administration of the trust, its compliance with its duties set forth in this Agreement, or with any written or oral instructions delivered to the Exchange Trustee by the Trust or TCPL pursuant hereto (collectively, “Claims” and individually, a “Claim”). In no case will the Trust or TCPL be liable under this indemnity for any Claim if such Claim is incurred or suffered by reason of or as a result of the fraud, negligence or wilful misconduct of an Indemnified Party and unless the Trust and TCPL shall be notified by the Exchange Trustee of the written assertion of a Claim promptly after any of the Indemnified Parties shall have received any such written assertion of a Claim or shall have been served with a summons or other first legal process giving information as to the nature and basis of the Claim, provided that a failure or delay to so notify

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the Trust and TCPL shall not diminish the liability of the Trust and TCPL hereunder except to the extent that the Trust and TCPL are materially prejudiced by such failure or delay. Subject to (ii) below, the Trust and TCPL shall be entitled to participate at their own expense in the defence and, if the Trust or TCPL so elect at any time after receipt of such notice, any of them may assume the defence of any suit brought to enforce any such Claim. The Exchange Trustee shall have the right to employ separate counsel in any such suit and participate in the defence thereof but the fees and expenses of such counsel shall be at the expense of the Exchange Trustee unless: (i) the employment of such counsel has been authorized by the Trust or TCPL, such authorization not to be unreasonably withheld; or (ii) the named parties to any such suit include both the Exchange Trustee and the Trust or TCPL and the Exchange Trustee shall have been advised by counsel acceptable to the Trust and TCPL that there may be one or more legal defences available to the Exchange Trustee that are different from or in addition to those available to the Trust or TCPL and that an actual or potential conflict of interest exists (in which case the Trust and TCPL shall not have the right to assume the defence of such suit on behalf of the Exchange Trustee but shall be liable to pay the reasonable fees and expenses of counsel for the Exchange Trustee). This provision shall survive the resignation or removal of the Exchange Trustee or the termination of this Agreement.

8.2Limitation of Liability

The Exchange Trustee shall not be held liable for any loss which may occur by reason of insolvency or termination of TCPL, the Trust or any Holder, as the case may be, or early termination of any investment under Section 6.10 or depreciation of the value of any part of the Series 2019-A Trust Estate or any loss incurred on any investment of funds pursuant to this Agreement, except to the extent that such loss is attributable to fraud, negligence or wilful misconduct on the part of the Exchange Trustee.

ARTICLE 9
CHANGE OF EXCHANGE TRUSTEE

9.1Resignation of Exchange Trustee

The Exchange Trustee, or any Exchange Trustee hereafter appointed, may at any time resign by giving written notice of such resignation to the Trust and TCPL specifying the date on which it desires to resign, provided that such notice shall be given at least 60 days before such desired resignation date, unless the Trust and TCPL otherwise agree, and further provided that such resignation shall not take effect until the date of the appointment of a successor Exchange Trustee and the acceptance of such appointment by the successor Exchange Trustee. Upon receiving such notice of resignation, the Trust and TCPL shall promptly appoint a successor Exchange Trustee, which successor shall be a resident of Canada for the purposes of the Tax Act, by written instrument in duplicate, one copy of which shall be delivered to the resigning Exchange Trustee and one copy to the successor Exchange Trustee. Failing acceptance by a successor Exchange Trustee, a successor Exchange Trustee may be appointed by an order of the Superior Court of Justice (Ontario) upon application of one or more of the parties hereto at the joint and several expense of the Trust and TCPL.

9.2Removal of Exchange Trustee

The Exchange Trustee, or any Exchange Trustee hereafter appointed, may be removed: (i) with cause or if the Exchange Trustee at any time ceases to be a resident of Canada for the purposes of the Tax Act, by written instrument executed by the Trust and TCPL; or (ii) with or without cause by the Holders of Trust Notes — Series 2019-A pursuant to an Extraordinary Resolution and, if any TCPL Exchange Preferred Shares are outstanding, by the affirmative vote of Holders of the TCPL Exchange Preferred Shares passed in accordance with the TCPL Exchange Preferred Share Provisions (as though the removal were an amendment to the TCPL Exchange Preferred Share Provisions), in all cases, at any time on 60 days’ prior written notice, which notice shall be delivered to the Exchange Trustee so removed and to the successor Exchange Trustee.

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9.3Successor Exchange Trustee

Any successor Exchange Trustee appointed as provided under this Agreement shall execute, acknowledge and deliver to the Trust and TCPL and to its predecessor Exchange Trustee an instrument accepting such appointment. Thereupon, the resignation or removal of the predecessor Exchange Trustee shall become effective and such successor Exchange Trustee, without any further act, deed or conveyance, shall become vested with all the rights, powers, duties and obligations of its predecessor under this Agreement, with like effect as if originally named as Exchange Trustee in this Agreement. However, on the written request of the Trust and TCPL or of the successor Exchange Trustee, the Exchange Trustee ceasing to act shall, upon payment of any amounts then due to it pursuant to the provisions of this Agreement, execute and deliver an instrument transferring to such successor Exchange Trustee all the rights and powers of the Exchange Trustee so ceasing to act. Upon the request of any such successor Exchange Trustee, the Trust and TCPL, such predecessor Exchange Trustee shall execute any and all instruments in writing for more fully and certainly vesting in and confirming to such successor Exchange Trustee all such rights and powers. Any company into which the Exchange Trustee may be merged or with which it may be consolidated or amalgamated, or any company resulting or continuing from any merger, consolidation or amalgamation to which the Exchange Trustee is a party or any company to which the Exchange Trustee may transfer all or substantially all of its corporate trust business, shall be a successor Exchange Trustee under this Agreement, without the execution or filing of any paper or further act on the part of any of the parties hereto.

9.4Notice of Successor Exchange Trustee

Upon acceptance of appointment by a successor Exchange Trustee as provided in this Agreement, the Trust and TCPL shall cause to be mailed notice of the succession of such Exchange Trustee under this Agreement to each registered Holder. If the Trust or TCPL fails to cause such notice to be mailed within 10 days after acceptance of appointment by the successor Exchange Trustee, the successor Exchange Trustee shall cause such notice to be mailed at the expense of the Trust and TCPL.

ARTICLE 10
AMENDMENTS AND SUPPLEMENTAL AGREEMENTS

10.1Ministerial Amendments

The parties to this Agreement may in writing, at any time and from time to time, without the approval of the Holders, amend, supplement or modify this Agreement for the purposes of:

(a)adding to the covenants of any or all of the parties hereto for the protection of the Holders hereunder;

(b)making such amendments or modifications not inconsistent with this Agreement as may be necessary or desirable with respect to matters or questions which, in the mutual opinion of the Trust, TCPL and the Exchange Trustee and their respective counsel, having in mind the best interests of the Holders as a whole, it may be expedient to make;

(c)making such changes or corrections which, on the advice of counsel to the Trust, TCPL and the Exchange Trustee, are required for the purpose of curing or correcting any ambiguity or defect or inconsistent provision or clerical omission or mistake or manifest error, provided that each of the Trust, TCPL and their respective counsel, and the Exchange Trustee based on the opinion of Counsel, shall be of the opinion that such changes or corrections shall not be prejudicial to the interests of the Holders as a whole; or

(d)making any additions to, deletions from or alterations of the provisions of this Agreement which, in the opinion of the Exchange Trustee and its counsel, shall not be prejudicial to the interests of the Holders as a whole or which, in the opinion of counsel to the Trust, TCPL and

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the Exchange Trustee, are necessary or advisable in order to incorporate, reflect or comply with any legislation the provisions of which apply to the Trust, TCPL, the Exchange Trustee or this Agreement.

10.2Meeting to Consider Amendments

The Trust and, if applicable, TCPL, shall call a meeting or meetings of the Holders for the purpose of considering and, if thought fit, approving, with the consent of Holders of Trust Notes — Series 2019-A or registered holders of Trust Notes, as applicable in accordance with the Trust Indenture pursuant to an Extraordinary Resolution and, if any TCPL Exchange Preferred Shares are then outstanding, of the Holders of TCPL Exchange Preferred Shares in accordance with TCPL Exchange Preferred Share Provisions (as though such action were an amendment to TCPL Exchange Preferred Share Provisions), as applicable, any proposed supplement, amendment or modification of this Agreement other than those referred to in Section 10.1. Any such meeting or meetings shall be called and held in accordance with the Trust Indenture, the TCPL Exchange Preferred Share Provisions (if applicable) and all Applicable Laws. Any supplement, amendment or modification referred to in this Section 10.2 shall be provided to the Exchange Trustee by the Trust or TCPL, as the case may be.

10.3Execution of Supplemental Agreements

No supplement or amendment to, or modification or waiver of, any of the provisions of this Agreement shall be effective unless made in writing and signed by all of the parties hereto. Subject to compliance with all Applicable Laws, the Trust, TCPL and the Exchange Trustee may, subject to the provisions hereof, and shall, when so directed by this Agreement, from time to time, execute and deliver agreements or other instruments supplemental hereto, evidencing any such supplement, amendment, modification or waiver which thereafter shall form part hereof.

ARTICLE 11
TERMINATION

11.1Term

This Agreement shall continue until the earliest to occur of the following events:

(a)no Trust Notes — Series 2019-A are outstanding and held by a Person other than TCPL or any of its Affiliates and no TCPL Exchange Preferred Shares remain outstanding;

(b)each of the Trustee and TCPL elects in writing to terminate the trust created hereby and such termination is approved by the Holders in accordance with Section 10.2; and

(c)21 years after the death of the last survivor of the descendants of Her Majesty Queen Elizabeth II of the United Kingdom of Great Britain and Northern Ireland living on the date of the creation of the Trust.

11.2Survival of Agreement

This Agreement shall survive any termination of the trust created hereby and shall continue until there are no Trust Notes — Series 2019-A outstanding and held by a Person other than TCPL or any of its Affiliates and there are no TCPL Exchange Preferred Shares outstanding; provided, however, that the provisions of Article 7 and Article 8 shall survive any such termination of this Agreement.

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ARTICLE 12
GENERAL

12.1Severability

If any provision of this Agreement is held to be invalid, illegal or unenforceable, the validity, legality or enforceability of the remainder of this Agreement shall not, in any way, be affected or impaired thereby and this Agreement shall be carried out as nearly as possible in accordance with its original terms and conditions.

12.2Enurement

This Agreement shall be binding upon and enure to the benefit of the parties hereto and their respective successors and permitted assigns and to the benefit of the Holders and their respective heirs, executors, personal representatives, successors and assigns.

12.3Notices to Parties

All notices and other communications between the parties hereunder shall be in writing and shall be deemed to have been given if delivered personally or by confirmed telecopy to the parties at the following addresses (or at such other address for such party as shall be specified in notice given hereunder):

(a)if to TCPL:

TransCanada PipeLines Limited
450 — 1st Street SW
Calgary, Alberta
T2P 5H1

Attention: Corporate Secretary
Facsimile: (403) 920-2467

(b)if to the Trust:

TransCanada Trust
c/o Computershare Trust Company of Canada
530 8 Avenue SW
Calgary, Alberta
T2P 3S8

Attention: Manager, Corporate Trust
Facsimile: (403) 267-6598

(c)if to the Exchange Trustee:

AST Trust Company (Canada)
600, the Dome Tower,
333 — 7th Avenue S.W.,
Calgary, AB T2P 2Z1

Attention: Director, Corporate Trust
Facsimile: (403) 776-3916

Any notice or other communication given personally shall be deemed to have been given and received upon delivery thereof, unless given on a day that is not a Business Day in which case it shall be deemed to be given

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on the next following Business Day, and if given by telecopy shall be deemed to have been given and received on the date of receipt thereof unless such day is not a Business Day, in which case it shall be deemed to have been given and received upon the immediately following Business Day.

12.4Notice to Holders

Any and all notices to be given and any documents to be sent to any Holder hereunder may be given or sent to the address of such Holder shown on the register of holders of Trust Notes — Series 2019-A or TCPL Exchange Preferred Shares, by prepaid first class mail or otherwise in any manner permitted by the Trust Notes — Series 2019-A Provisions or TCPL Exchange Preferred Share Provisions, as applicable, and shall be deemed to be received (if given or sent in such manner) at the time specified in the Trust Notes — Series 2019-A Provisions or TCPL Exchange Preferred Share Provisions.

12.5Risk of Payments by Post

Whenever payments are to be made or documents are to be sent to any Holder by the Trust, TCPL or the Exchange Trustee, or by such Holder to the Trust, TCPL or the Exchange Trustee, the making of such payment or sending of such document through the post shall be at the risk of the Trust, TCPL or the Exchange Trustee, as applicable, in the case of payments made or documents sent by the Trust, TCPL or the Exchange Trustee, as applicable, and the Holder, in the case of payments made or documents sent by the Holder.

12.6Counterparts

This Agreement may be executed by manual signature in counterparts, each of which shall be deemed an original and all of which, when taken together, shall be deemed to constitute one and the same instrument.

12.7Jurisdiction

This Agreement shall be governed by and construed in accordance with the laws of the Province of Ontario and the federal laws of Canada applicable in the Province of Ontario.

12.8Exclusion of Contractual Liability

In accordance with Section 7.15 of the Declaration of Trust, to the extent that this Agreement operates to create obligations of the Trustee, such obligations are not binding upon the Trustee except in its capacity as trustee of the Trust, nor shall resort be had to the property of the Trustee except in its capacity as Trustee of the Trust and only the assets of the Trust shall be so bound.

12.9Appointment of Administrative Agent

The parties hereto acknowledge that the Trustee has appointed TCPL as “Administrative Agent” under the Administration Agreement and has delegated to it the powers (and TCPL has assumed the obligations) as set out in the Administration Agreement.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their duly authorized officers as of the date first above written.

TRANSCANADA TRUST, by its Administrative Agent, TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary
TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary
AST TRUST COMPANY (CANADA)
By:	/s/ Nelia Andrade
	Name:	Nelia Andrade
	Title:	Authorized Signatory
By:	/s/ Marta Recinos
	Name:	Marta Recinos
	Title:	Authorized Signatory

[Signature page to Share Exchange Agreement]

SCHEDULE A

TCPL EXCHANGE PREFERRED SHARE PROVISIONS

FIRST PREFERRED SHARES, SERIES 2019-A EXCHANGE

There is hereby authorized and created a series of First Preferred Shares designated as the “First Preferred Shares, Series 2019-A Exchange” (hereinafter referred to as the “Exchange Preferred Shares, Series 2019-A”), consisting of such number of shares sufficient to satisfy the rights of former holders of Trust Notes to receive Exchange Preferred Shares, Series 2019-A following an Automatic Exchange.  The Exchange Preferred Shares, Series 2019-A may be issued in whole or in fractional shares, as provided below, and shall, in addition to the rights, privileges, restrictions and conditions attaching to the First Preferred Shares as a class (collectively and respectively, the “First Preferred Shares Class Provisions” and the “First Preferred Shares”), carry and be subject to the following rights, privileges, restrictions and conditions (collectively, the “Exchange Preferred Shares, Series 2019-A Provisions”):

Dividends

1.The holders of the Exchange Preferred Shares, Series 2019-A shall be entitled to receive and the Corporation shall pay thereon, as and when declared by the board of directors out of the monies of the Corporation properly applicable to the payment of dividends, on each Dividend Payment Date fixed cumulative preferential cash dividends equal to the quotient obtained by dividing: (x) the product obtained by multiplying $1,000 by a rate per annum equal to the rate of interest payable by the Trust on the Trust Notes at the Exchange Time, by (y) four; provided that if an event (including a redemption) shall occur that results in accrued and unpaid dividends for a partial Dividend Period becoming payable, the dividend payable for any partial Dividend Periods shall be equal to the product obtained by multiplying the amount in (x) above by a fraction, the numerator of which is the actual number of days attributable to the partial Dividend Period and the denominator of which is 365, subject in each case to any applicable withholding tax.

2.If on any Dividend Payment Date the dividend payable on such date is not paid in full on all of the Exchange Preferred Shares, Series 2019-A then issued and outstanding, such dividend or the unpaid part thereof shall be paid on a subsequent date or dates to be determined by the board of directors on which the Corporation shall have sufficient monies properly available, under the provisions of any applicable law and under the provisions of any trust indenture securing bonds, debentures or other securities of the Corporation, to the payment of the same.  The holders of the Exchange Preferred Shares, Series 2019-A shall not be entitled to any dividends other than or in excess of the cumulative preferential cash dividends hereinbefore provided.  Payment shall be made by electronic funds transfer or by cheque of or on behalf of the Corporation payable in lawful money of the United States (less any tax required to be deducted) and payment thereof shall satisfy such dividends.

Liquidation, Dissolution or Winding-Up

3.In the event of the liquidation, dissolution or winding-up of the Corporation, whether voluntary or involuntary, or any other distribution of assets of the Corporation among its shareholders for the purpose of winding-up its affairs, the holders of the Exchange Preferred Shares, Series 2019-A in accordance with the First Preferred Shares Class Provisions, shall be entitled to receive the amount of $1,000 (less any amount that may have been returned to the holders of Exchange Preferred Shares, Series 2019-A as a return of capital), together with an amount equal to all accrued and unpaid dividends thereon, which amount for such purposes shall be calculated as if such dividends were accruing for the period from the expiration of the last Dividend Period for which dividends thereon have been paid up to the date of such event, subject to any applicable withholding tax, the whole before any amount shall be paid or any property or assets of the Corporation shall be distributed to the holders of the common shares or to the holders of any other shares ranking junior to the Exchange Preferred Shares, Series 2019-A. After payment to the holders of the Exchange Preferred Shares, Series 2019-A of the

amount so payable to them they shall not be entitled to share in any other distribution of the property or assets of the Corporation.

Voting Rights

4.The holders of the Exchange Preferred Shares, Series 2019-A shall not be entitled to receive notice of or attend any meeting of the shareholders of the Corporation or to vote at any such meeting unless and until the Corporation from time to time shall fail to pay in the aggregate six quarterly dividends on the Exchange Preferred Shares, Series 2019-A on the dates on which the same should be paid according to the terms thereof, whether or not consecutive and whether or not dividends have been declared and whether or not there are any moneys of the Corporation properly applicable to the payment of dividends. Thereafter each holder of Exchange Preferred Shares, Series 2019-A shall be entitled to receive notice of all meetings of shareholders and attend thereat and shall be entitled to at any and all such meetings, one vote per each Exchange Preferred Share, Series 2019-A held and shall continue to be entitled to notice and so to attend and vote until such time as all arrears of dividends on any outstanding Exchange Preferred Shares, Series 2019-A shall have been paid, whereupon the rights of holders of Exchange Preferred Shares, Series 2019-A to receive notice of meetings and to attend thereat and vote in respect of such Exchange Preferred Shares, Series 2019-A shall cease unless and until six quarterly dividends on the Exchange Preferred Shares, Series 2019-A shall again be in arrears and unpaid, whereupon the holders of the Exchange Preferred Shares, Series 2019-A shall again have the right to receive notice and to attend and vote as above provided and so on from time to time.

Purchase for Cancellation

5.The Corporation may, at any time and from time to time on or after the date that is ten years after the Closing Date, subject to the provisions of the Canada Business Corporations Act, and the provisions below under “Redemption” and “Restrictions on Payment of Dividends and Reduction of Junior Capital”, purchase for cancellation (if obtainable), in the manner provided in the First Preferred Shares Class Provisions, the whole or any part of the Exchange Preferred Shares, Series 2019-A outstanding from time to time at any price.

Redemption

6.The Corporation may not redeem the Exchange Preferred Shares, Series 2019-A on or prior to the date that is ten years after the Closing Date.  Subject to the provisions of the Canada Business Corporations Act and the provisions below under “Restrictions on Payment of Dividends and Reduction of Junior Capital” the Corporation may redeem all, or from time to time any part, of the outstanding Exchange Preferred Shares, Series 2019-A, without the consent of the holders of the Exchange Preferred Shares, Series 2019-A, on not more than 60 days and not less than 30 days prior notice, at any time after the date that is ten years after the Closing Date, by the payment of an amount in cash for each such share so redeemed of $1,000 per share (such price being hereinafter referred to as the “Redemption Price”) together with an amount equal to all accrued and unpaid dividends thereon, which amount for such purpose shall be calculated as if such dividends were accruing for the period from the expiration of the last Dividend Period for which dividends thereon have been paid up to the date of such redemption, subject to any applicable withholding tax.

Restrictions on Payment of Dividends and Reduction of Junior Capital

7.So long as any of the Exchange Preferred Shares, Series 2019-A are outstanding the Corporation shall not, without the approval of the holders of the Exchange Preferred Shares, Series 2019-A:

(a)declare any dividend on the common shares or any shares ranking junior to the Exchange Preferred Shares, Series 2019-A (other than stock dividends on shares ranking junior to the Exchange Preferred Shares, Series 2019-A);

(b)redeem, purchase or otherwise retire any of the common shares or any other shares ranking junior to the Exchange Preferred Shares, Series 2019-A (except out of the net cash proceeds of

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a substantially concurrent issue of shares ranking junior to the Exchange Preferred Shares, Series 2019-A), or

(c)redeem, repurchase or otherwise retire: (i) less than all of the Exchange Preferred Shares, Series 2019-A; or (ii) except pursuant to any purchase obligation, sinking fund, retraction privilege, or mandatory redemption provisions attaching to any series of preferred shares of the Corporation, any other shares ranking on parity with the Exchange Preferred Shares, Series 2019-A;

unless, in each case, all dividends payable on the Exchange Preferred Shares, Series 2019-A, and on all other shares ranking prior to or on parity with the Exchange Preferred Shares, Series 2019-A, have been declared and paid or set apart for payment, subject to any applicable withholding tax.

Fractional Shares

8.The Exchange Preferred Shares, Series 2019-A may be issued in whole or in fractional shares.  Each fractional Exchange Preferred Share, Series 2019-A shall carry and be subject to the rights, privileges, restrictions and conditions (including voting rights and dividend rights) of the Exchange Preferred Shares, Series 2019-A in proportion to the applicable fraction.

Exchange Preferred Shares, Series 2019-A Definitions

9.The following terms shall have the following respective meanings:

“Automatic Exchange” means the automatic exchange of the Trust Notes for the right to receive Exchange Preferred Shares, Series 2019-A upon the occurrence of an Automatic Exchange Event.

“Automatic Exchange Event” means an event giving rise to the Automatic Exchange, being the occurrence of any one of the following:  (a) the making by TCE or the Corporation of a general assignment for the benefit of its creditors or a proposal (or the filing of a notice of its intention to do so) under the Bankruptcy and Insolvency Act (Canada), (b) any proceeding instituted by TCE or the Corporation seeking to adjudicate it a bankrupt or insolvent or seeking liquidation, winding up, dissolution, reorganization, arrangement, adjustment, protection, relief or composition of its debts under any law relating to bankruptcy, insolvency or reorganization, or seeking the entry of an order for the appointment of a receiver, interim receiver,  trustee or other similar official for TCE or the Corporation or any substantial part of its property and assets in circumstances where TCE or the Corporation, as applicable, is adjudged a bankrupt or insolvent, (c) a receiver, interim receiver, trustee or other similar official is appointed over TCE or the Corporation or for any substantial part of its property and assets by a court of competent jurisdiction in circumstances where TCE or the Corporation, as applicable, is adjudged a bankrupt or insolvent; or (d) any proceeding is instituted against TCE or the Corporation seeking to adjudicate it a bankrupt or insolvent or seeking liquidation, winding up, dissolution, reorganization, arrangement, adjustment, protection, relief or composition of its debts under any law relating to bankruptcy, insolvency or reorganization, or seeking the entry of an order for the appointment of a receiver, interim receiver, trustee or other similar official for TCE or the Corporation or any substantial part of its property and assets in circumstances where TCE or the Corporation, as applicable, is adjudged a bankrupt or insolvent,  and either such proceeding has not been stayed or dismissed within 60 days of the institution of any such proceeding or the actions sought in such proceedings occur (including the entry of an order for relief against TCE or the Corporation or the appointment of a receiver, interim receiver, trustee, or other similar official for it or for any substantial part of its property and assets).

“Business Day” means a day on which the Corporation is open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

“Closing Date” means September 12, 2019;

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“Dollars”, “dollars” or the sign “$” shall be deemed to be a reference to lawful money of the United States.

“Dividend Payment Date” means March 15, June 15, September 15 and December 15 of each year during which any Exchange Preferred Shares, Series 2019-A are issued and outstanding.

“Dividend Period” means, initially, the period from and including the Issue Date to but excluding the next following Dividend Payment Date, and thereafter the period from and including each Dividend Payment Date to, but excluding, the next following Dividend Payment Date (including any partial period as contemplated in section 1, above).

“Exchange Time” means the time at which the Automatic Exchange will be effective, being 8:00 a.m. (Eastern Time) on the date that an Automatic Exchange Event occurs.

“Issue Date” means the date on which the Exchange Preferred Shares, Series 2019-A are issued.

“TCE” means TC Energy Corporation.

“Trust” means TransCanada Trust, a unit trust established under the laws of the Province of Ontario.

“Trust Notes” means the Trust Notes — Series 2019-A of the Trust, representing a series of junior subordinated unsecured debt obligations, due September 15, 2079.

Amendments

10.Sections 1 to 11, inclusive, of these Exchange Preferred Shares, Series 2019-A Provisions may be repealed, altered, modified, amended or amplified only with the sanction of the holders of the Exchange Preferred Shares, Series 2019-A given as hereinafter specified in addition to any other approval required by the Canada Business Corporations Act.

Sanction by Holders of Exchange Preferred Shares, Series 2019-A

11.The sanction by holders of the Exchange Preferred Shares, Series 2019-A as to any and all matters referred to herein or as to any change adversely affecting the rights or privileges of the Exchange Preferred Shares, Series 2019-A may be given and shall be deemed to have been sufficiently given if given by the holders of the Exchange Preferred Shares, Series 2019-A in the manner provided in the First Preferred Shares Class Provisions with respect to the sanction of the holders of any series of the First Preferred Shares and the said provisions shall apply mutatis mutandis.

Tax Election

12.The Corporation shall elect, in the manner and within the time provided under section 191.2 of the Income Tax Act (Canada) or any successor or replacement provision of similar effect, to pay tax at a rate and take all other necessary action under such Act such that no holder of the Exchange Preferred Shares, Series 2019-A will be required to pay tax on dividends received on the Exchange Preferred Shares, Series 2019-A under section 187.2 of Part IV.1 of such Act or any successor or replacement provision of similar effect.

Non-Business Days

13.In the event that any date on which any dividend is payable by the Corporation, or any date on or by which any other action is required to be taken or determination made by the Corporation or the holders of Exchange Preferred Shares, Series 2019-A hereunder, is not a Business Day, then such dividend shall be payable, or such other action shall be required to be taken or determination made, on or before the next succeeding day that is a Business Day.

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EX-3

Exhibit 3

TCPL SUBORDINATED NOTE PURCHASE AGREEMENT

September 12, 2019

TO:TransCanada Trust

c/o TransCanada PipeLines Limited, as Administrative Agent

450 - 1st Street S.W.

Calgary, Alberta,

T2P 5H1 Canada

Purchase of TCPL Subordinated Notes

The purpose of this letter agreement (the “Agreement”) is to confirm the terms under which TransCanada Trust (the “Trust”) has agreed to purchase and TransCanada PipeLines Limited (“TCPL”) has agreed to issue and sell to the Trust, junior subordinated notes in the principal amount of $1,100,000,000 (the “TCPL Sub Notes”) in United States Dollars.  The TCPL Sub Notes are issued under a trust indenture dated as of May 20, 2015, as supplemented by a fifth supplemental indenture dated as of September 12, 2019, in each case between TCPL and Computershare Trust Company of Canada (as so supplemented, the “Indenture”) and have the rights and entitlements described therein.

Agreement to Purchase

1.TCPL hereby agrees to issue and deliver, or cause to be delivered, to the Trust, and the Trust hereby agrees to purchase, the TCPL Sub Notes in the manner and for the consideration described in this Agreement.

Subscription Price

2.The subscription price for the TCPL Sub Notes will be $1,100,000,000 (the “Subscription Price”) in United States Dollars.  The Subscription Price will be paid by the Trust to TCPL in accordance with Section 7 of this Agreement.

Representations and Warranties

3.The Trust represents and warrants to TCPL that it is purchasing the TCPL Sub Notes as principal and is an “accredited investor” as defined in National Instrument 45-106 of the Canadian Securities Administrators.

4.TCPL represents and warrants that the TCPL Sub Notes have been duly authorized and executed by TCPL and, when authenticated and delivered to the Trust in accordance with the terms hereof and the terms of the Indenture, will constitute valid and binding obligations of TCPL entitled to the benefits of the Indenture and enforceable against TCPL in accordance with their terms except as enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting the enforcement of the rights of creditors generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding at law or in equity).

Covenants

5.The Trust will execute and deliver within the applicable time periods all documentation as may be required by applicable securities laws, if any, to permit the purchase of the TCPL Sub Notes on the terms set forth herein and the Trust will execute, deliver, file and otherwise assist TCPL in filing such reports, undertakings and other documents, if any, with respect to the issue of the TCPL Sub Notes as may be required by applicable securities laws or by any securities regulatory authority or stock exchange or other regulatory authority.

6.The Trust understands that (i) the TCPL Sub Notes are subject to transfer restrictions, and (ii) it will not be able to resell the TCPL Sub Notes until expiry of the applicable hold period under applicable Canadian securities laws except in accordance with limited exemptions and compliance with other requirements of applicable law, and the Trust (and not TCPL) is responsible for compliance with applicable resale restrictions or hold periods and will comply with such transfer restrictions and all relevant securities laws in connection with any resale of the TCPL Sub Notes.

Delivery and Payment

7.The issuance and purchase of the TCPL Sub Notes contemplated by this Agreement will take place at the offices of TCPL, 450- 1st Street S.W., Calgary, Alberta T2P 5C1 at 8:00 a.m. (Calgary time) on September 12, 2019 (the “Closing”).  At the Closing, TCPL will issue and deliver, or cause to be delivered, to the Trust one or more certificates for the TCPL Sub Notes, registered in the name of the Trust and the Trust will pay the Subscription Price to TCPL by cheque, bank draft or electronic transfer of funds or as otherwise agreed by the Trust and TCPL.

Personal Information Authorization

8.By executing this Agreement, the Trust hereby consents to the collection, use and disclosure of the personal information provided herein and other personal information provided by the Trust or collected by TCPL or its agents as reasonably necessary in connection with the Trust’s subscription for the TCPL Sub Notes (collectively, “personal information”) including as follows: (a) TCPL may use personal information and disclose personal information to intermediaries such as TCPL’s legal counsel and withholding and/or transfer agents for the purposes of determining the Trust’s eligibility to invest in the TCPL Sub Notes and for managing and administering the Trust’s investment in the TCPL Sub Notes; (b) TCPL, its agents and advisors, may each collect, use and disclose personal information for the purposes of meeting legal, regulatory, self-regulatory, security and audit requirements (including any applicable tax, securities, money laundering or anti-terrorism legislation, rules or regulations) and as otherwise permitted or required by law, which disclosures may include disclosures to tax, securities or other regulatory or self-regulatory authorities in Canada and/or in foreign jurisdictions, if applicable, in connection with the regulatory oversight mandate of such authorities; (c) TCPL and its agents and advisors may use personal information and disclose personal information to parties connected with the proposed or actual transfer, sale, assignment, merger or amalgamation of TCPL or its business or assets or similar transactions, for the purpose of permitting such parties to evaluate and/or proceed with and complete such transaction.  Purchasers, assignees and successors of TCPL or its business or assets may collect, use and disclose personal information as described in this Agreement.  The Trust acknowledges that TCPL’s agents or intermediaries may be located outside of Canada, and personal information may be transferred and/or processed outside of Canada for the purposes described above, and that measures TCPL may use to protect personal information while handled by agents, intermediaries or other third parties on its behalf, and personal information otherwise disclosed or transferred outside of Canada for the purposes described above, are subject to legal requirements in foreign

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countries applicable to TCPL or such third parties, for example lawful requirements to disclose personal information to government authorities in those countries.

Governing Law

9.This Agreement will be governed by and construed in accordance with the laws of Ontario and the federal laws of Canada applicable therein.

Entire Agreement

10.This Agreement contains the entire agreement of the parties relating to the purchase of the TCPL Sub Notes by the Trust and there are no representations, warranties, covenants or other agreements relating to the subject matter of this Agreement except as stated or referred to in this Agreement.

Time of the Essence

11.Time is of the essence of this Agreement.

Severability

12.Any provision of this Agreement which is found to be unenforceable by a court of competent jurisdiction will be ineffective to the extent of such unenforceability and will be severed from the balance of this Agreement, all without affecting the remaining provisions of this Agreement or affecting the validity or enforceability of such provisions.

Recourse to the Trustee and the Trust

13.Where any reference is made in this Agreement to an act to be performed by or for or on behalf of the Trust, or a right or obligation of the Trust, such reference will be construed and applied for all purposes as if it referred to an act to be performed by or a right or obligation of Computershare Trust Company (the “Trustee”) for and on behalf of and in its capacity as trustee of the Trust.  This Agreement will be deemed and construed for all purposes as if made by the Trustee in and only in its capacity as trustee of the Trust. Subject to the exceptions set out in the Trust’s declaration of trust: (i) any liability, debt or obligation of the Trustee under this Agreement is non-recourse to the Trustee in its personal capacity and limited solely to the trust assets; (ii) no other property or assets of the Trustee, whether owned by it in its personal capacity or otherwise, will be subject to levy, execution or other enforcement procedure with regard to any obligation under this Agreement; and (iii) no recourse may be had or taken, directly or indirectly, against the Trustee in its personal capacity or against any incorporator, shareholder, director, officer, representative, employee, agent or advisor of the Trustee or any predecessor or successor of the Trustee.

Delivery of the TCPL Subordinated Note Purchase Agreement

14.TCPL and the Trust agree that two signed copies of this Agreement, together with any required forms, if any, necessary to comply with applicable securities legislation and policies, will be delivered to TCPL at Closing subject to extension through mutual agreement between TCPL and the Trust.

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Counterparts

15.This Agreement may be executed in counterparts, each of which shall be deemed to be an original and both of which taken together shall be deemed to constitute one and the same instrument. To evidence its execution of an original counterpart of this Agreement, a party may send a copy of its original signature on the execution page hereof to the other party by electronic transmission, and such transmission shall constitute delivery of an executed copy of this Agreement to the receiving party.

[REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

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TRANSCANADA TRUST, by its Administrative Agent, TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
	Name:		Joel E. Hunter
	Title:		Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary

Confirmation and Acceptance

This TCPL Subordinated Note Purchase Agreement is confirmed and accepted by TCPL as of September 12, 2019.

TRANSCANADA PIPELINES LIMITED

By:	/s/ Joel E. Hunter
	Name:	Joel E. Hunter
	Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
	Name:	Christine R. Johnston
	Title:	Vice-President, Law and Corporate Secretary

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EX-4

Exhibit 4

TRANSCANADA TRUST

as Issuer

TRANSCANADA PIPELINES LIMITED

as Credit Supporter

and

AST TRUST COMPANY (CANADA)

as Trustee

FIFTH SUPPLEMENTAL INDENTURE

PROVIDING FOR THE ISSUE OF

UP TO $1,100,000,000 PRINCIPAL AMOUNT OF

TRUST NOTES - SERIES 2019-A DUE SEPTEMBER 15, 2079

Dated as of September 12, 2019

Table of Contents

		Page
ARTICLE 1 INTERPRETATION		2
1.1	Definitions	2
1.2	Interpretation Not Affected By Headings, etc.	9
1.3	Incorporation of Certain Definitions	9
1.4	Definition of “this Indenture”	9
1.5	Currency References	9
1.6	Appointment of Exchange Trustee under the Share Exchange Agreement	9
1.7	Appointment of the Indenture Trustee	10
1.8	Additional Provisions Relating to the Trust Notes — Series 2019-A	10
ARTICLE 2 THE TRUST NOTES — SERIES 2019-A		11
2.1	Limitation on Issue and Designation	11
2.2	Terms of Trust Notes — Series 2019-A	11
2.3	Form of Trust Notes - Series 2019-A	12
2.4	Registrar and Transfer Agent, Paying Agent and Calculation Agent	13
2.5	Benchmark Determination	13
2.6	Rights of Set-Off	13
2.7	Additional Amounts	14
ARTICLE 3 REDEMPTION AND PURCHASE FOR CANCELLATION OF THE TRUST NOTES — SERIES 2019-A		15
3.1	Redemption of Trust Notes - Series 2019-A at the Option of the Issuer	15
3.2	Partial Redemption of Trust Notes - Series 2019-A	15
3.3	Early Redemption upon a Tax Event	15
3.4	Early Redemption upon Rating Event	15
3.5	Notice of Redemption	16
3.6	Purchase of the Trust Notes - Series 2019-A for Cancellation	16
3.7	Cancellation of the Trust Notes - Series 2019-A	16
ARTICLE 4 AUTOMATIC EXCHANGE		17
4.1	Automatic Exchange	17
4.2	Redemption by Issuer following Automatic Exchange	17
4.3	Right not to Deliver the TCPL Exchange Preferred Shares	18
ARTICLE 5 DEFERRAL RIGHT		19
5.1	Application of Interest	19
5.2	Acknowledgement of Holders	19
5.3	No Limit	19
5.4	Right not to Deliver the TCPL Deferral Preferred Shares	19
ARTICLE 6 GUARANTEE		20

Table of Contents (continued)

				Page
6.1	Guarantee of Trust Notes — Series 2019-A			20
6.2	Consolidation, amalgamation, merger, conveyance, transfer or lease			21
6.3	Successor Substituted			22
6.4	Notice to the Credit Supporter			22
6.5	Reports by the Credit Supporter			22
ARTICLE 7 SUBORDINATION OF GUARANTEE				23
7.1	Guarantee Subordinated to Guarantor Senior Indebtedness			23
7.2	Disputes with Holders of Certain Guarantor Senior Indebtedness			24
7.3	Subrogation			25
7.4	Obligation of Credit Supporter Unconditional			25
7.5	Payments on Guarantee Permitted			25
7.6	Effectuation of Subordination by Trustee			26
7.7	Knowledge of Trustee			26
7.8	Trustee May Hold Guarantor Senior Indebtedness			26
7.9	Rights of Holders of Guarantor Senior Indebtedness Not Impaired			26
7.10	Article Applicable to Paying Agents			26
ARTICLE 8 INDENTURE SUPPLEMENTAL TO ORIGINAL INDENTURE				27
8.1	Indenture Supplemental to Original Indenture			27
ARTICLE 9 ACCEPTANCE OF TRUSTS BY TRUSTEE				27
9.1	Acceptance of Trusts by Trustee			27
ARTICLE 10 MISCELLANEOUS				27
10.1	Counterparts			27
10.2	Language of Indenture			27
SCHEDULE
SCHEDULE 2.3		—	Form of Fully Registered Trust Notes - Series 2019-A

THIS FIFTH SUPPLEMENTAL INDENTURE dated as of September 12, 2019,

BETWEEN:

TRANSCANADA TRUST, a trust established under the laws of the Province of Ontario, by its administrative agent, TransCanada PipeLines Limited

(hereinafter called the “Issuer” or the “Trust”)

OF THE FIRST PART

TRANSCANADA PIPELINES LIMITED, a corporation existing under the federal laws of Canada and having an office in the City of Calgary in the Province of Alberta

(hereinafter called “TCPL” or the “Credit Supporter”)

OF THE SECOND PART

- and -

AST TRUST COMPANY (CANADA), a trust company existing under the federal laws of Canada and having an office in the City of Calgary in the Province of Alberta

(hereinafter called the “Trustee”)

OF THE THIRD PART

WHEREAS by a trust indenture (the “Original Indenture”) dated as of May 20, 2015 between the Issuer and the Trustee, provision was made for the issue of subordinated notes of the Issuer without limitation as to the aggregate principal amount but issuable only subject to the provisions of the Original Indenture;

WHEREAS by a first supplemental indenture to the Original Indenture dated as of May 20, 2015, U.S.$750,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of Trust Notes designated as Trust Notes - Series 2015-A due May 20, 2075, were issued;

WHEREAS by a second supplemental indenture to the Original Indenture dated as of August 11, 2016, U.S.$1,200,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of Trust Notes designated as Trust Notes - Series 2016-A due August 15, 2076, were issued;

WHEREAS by a third supplemental indenture to the Original Indenture dated as of March 2, 2017, U.S.$1,500,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of Trust Notes designated as Trust Notes - Series 2017-A due March 15, 2077, were issued;

WHEREAS by a fourth supplemental indenture to the Original Indenture dated as of May 18, 2017, Cdn.$1,500,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of Trust Notes designated as Trust Notes - Series 2017-B due May 18, 2077, were issued;

WHEREAS the Issuer is desirous of issuing additional subordinated notes under the provisions of the Original Indenture, and this supplemental indenture, as a Series of Trust Notes to be designated as Trust Notes - Series 2019-A due September 15, 2079;

WHEREAS the Issuer, the Credit Supporter and the Trustee have agreed to supplement the Original Indenture as herein provided;

WHEREAS all necessary action has been taken by the Issuer to make the Trust Notes - Series 2019-A, when certified by the Trustee and issued as provided in this supplemental indenture, valid, binding and legal obligations of the Issuer with the benefits and subject to the terms of the Original Indenture and to make this supplemental indenture a valid and binding agreement of the Issuer, in accordance with its terms; and

WHEREAS the foregoing recitals are made as representations and statements of fact by the Issuer and not by the Trustee.

NOW THEREFORE THIS INDENTURE WITNESSETH and it is hereby covenanted, agreed and declared as follows:

ARTICLE 1

INTERPRETATION

1.1Definitions

In this supplemental indenture, unless there is something in the subject matter or context inconsistent therewith:

“1970 Indenture” means the Trust Indenture made as of the 15th day of June, 1970 between TCPL and Crown Trust Company, as amended or supplemented from time to time;

“Additional Amounts” has the meaning ascribed to such term in Section 2.7.1;

“Assignment and Set-Off Agreement” means the agreement between TCPL, the Trustee, as bare trustee and nominee for and on behalf of Holders of Trust Notes - Series 2019-A, TCE and the Issuer dated September 12, 2019 pursuant to which, among other things, TCPL granted the Deferral Event Subscription;

“Automatic Exchange” has the meaning ascribed to such term in the Share Exchange Agreement;

“Automatic Exchange Event” has the meaning ascribed to such term in the Share Exchange Agreement;

“Automatic Exchange Event Notice” has the meaning ascribed to such term in the Share Exchange Agreement;

“Benchmark” means initially, three-month LIBOR; provided that if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to three-month LIBOR or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement;

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“Benchmark Replacement” means the Interpolated Benchmark with respect to the then-current Benchmark; provided that if the Issuer or its designee cannot determine the Interpolated Benchmark as of the Benchmark Replacement Date, then “Benchmark Replacement” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1)the sum of: (a) Term SOFR and (b) the Benchmark Replacement Adjustment;

(2)the sum of: (a) Compounded SOFR and (b) the Benchmark Replacement Adjustment;

(3)the sum of: (a) the alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then-current Benchmark for the applicable Corresponding Tenor and (b) the Benchmark Replacement Adjustment;

(4)the sum of: (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment;

(5)the sum of: (a) the alternate rate of interest that has been selected by the Issuer or its designee as the replacement for the then-current Benchmark for the applicable Corresponding Tenor giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar denominated floating rate notes at such time and (b) the Benchmark Replacement Adjustment;

“Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by the Issuer or its designee as of the Benchmark Replacement Date:

(1)the spread adjustment, or method for calculating or determining such spread adjustment, (which may be a positive or negative value or zero) that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement;

(2)if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, then the ISDA Fallback Adjustment;

(3)the spread adjustment (which may be a positive or negative value or zero) that has been selected by the Issuer or its designee giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar denominated floating rate notes at such time;

“Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definition of “Interest Period”, timing and frequency of determining rates and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Issuer decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Issuer decides that adoption of any portion of such market practice is not administratively feasible or if the Issuer determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Issuer determines is reasonably necessary);

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark:

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(1) in the case of clause (1) or (2) of the definition of “Benchmark Transition Event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark; or

(2) in the case of clause (3) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein.

For the avoidance of doubt, if the event giving rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination;

“Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark:

(1) a public statement or publication of information by or on behalf of the administrator of the Benchmark announcing that such administrator has ceased or will cease to provide the Benchmark, permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark;

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark, the central bank for the currency of the Benchmark, an insolvency official with jurisdiction over the administrator for the Benchmark, a resolution authority with jurisdiction over the administrator for the Benchmark or a court or an entity with similar insolvency or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark has ceased or will cease to provide the Benchmark permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark; or

(3) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative;

“Canadian Taxes” has the meaning ascribed to such term in Section 2.7.1;

“Closing Date” means September 12, 2019;

“Compounded SOFR” means the compounded average of SOFRs for the applicable Corresponding Tenor, with the rate, or methodology for this rate, and conventions for this rate (which will be compounded in arrears with a lookback and/or suspension period as a mechanism to determine the interest amount payable prior to the end of each Interest Period) being established by the Issuer or its designee in accordance with:

(1) the rate, or methodology for this rate, and conventions for this rate selected or recommended by the Relevant Governmental Body for determining Compounded SOFR; provided that:

(2) if, and to the extent that, the Issuer or its designee determines that Compounded SOFR cannot be determined in accordance with clause (1) above, then the rate, or methodology for this rate, and conventions for this rate that have been selected by the Issuer or its designee giving due consideration to any industry-accepted market practice for U.S. dollar denominated floating rate notes at such time;

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“Corresponding Tenor” with respect to a Benchmark Replacement means a tenor (including overnight) having approximately the same length (disregarding business day adjustment) as the applicable tenor for the then-current Benchmark;

“Credit Supporter” means TCPL, in its capacity as guarantor of the Trust Notes — Series 2019-A hereunder, and includes any successor entity to or of TCPL which shall have complied with the provisions of Section 6.2;

“Deferral Date” has the meaning ascribed to such term in the Assignment and Set-Off Agreement;

“Deferral Event” has the meaning ascribed to such term in the Assignment and Set-Off Agreement;

“Deferral Event Subscription” has the meaning ascribed to such term in the Assignment and Set-Off Agreement;

“Deferral Event Subscription Proceeds” has the meaning ascribed to such term in the Assignment and Set-Off Agreement;

“Deferral Event Subscription Proceeds Assignment” has the meaning ascribed to such term in the Assignment and Set-Off Agreement;

“Exchange Trustee” has the meaning ascribed to such term in the Share Exchange Agreement;

“Excluded Holder” has the meaning ascribed to such term in Section 2.7.1;

“Federal Reserve Bank of New York’s Website” means the website of the Federal Reserve Bank of New York at http://www.newyorkfed.org, or any successor source;

“Fitch” means Fitch Ratings Inc.;

“Guarantee” means the guarantee of the Trust Notes - Series 2019-A provided by the Credit Supporter, in accordance with the terms and conditions of this supplemental indenture;

“Guarantor Senior Indebtedness” means obligations (other than non-recourse obligations, the obligations under the Guarantee or any other obligations specifically designated as being subordinate in right of payment to Guarantor Senior Indebtedness) of, or guaranteed or assumed by, the Credit Supporter for borrowed money or evidenced by bonds, debentures or notes or obligations of TCPL for or in respect of bankers’ acceptances (including the face amount thereof), letters of credit and letters of guarantee (including all reimbursement obligations in respect of each of the forgoing) or other similar instruments, and amendments, renewals, extensions, modifications and refundings of any such indebtedness or obligation;

“Holders” means the registered holders, from time to time, of the Trust Notes - Series 2019-A or, where the context requires, all of such holders;

“Indebtedness” means any bonds, debentures or other obligations with respect to borrowed money;

“Ineligible Person” means any Person whose address is in, or whom the Trust, TCPL or TCPL’s transfer agent has reason to believe is a resident of, any jurisdiction outside of Canada and the United States to the extent that: (i) the issuance or delivery by TCPL or the Trust to such Person,

5

upon an Automatic Exchange or Deferral Event, of TCPL Exchange Preferred Shares or TCPL Deferral Preferred Shares, as applicable, would require TCPL or the Trust to take any action to comply with securities or analogous laws of such jurisdiction; or (ii) withholding tax would be applicable in connection with the delivery to such Person of TCPL Exchange Preferred Shares upon an Automatic Exchange;

“Interest Payment Date” means, prior to and excluding September 15, 2029, March 15 and September 15 (other than September 15, 2019) and, starting September 15, 2029, March 15, June 15, September 15 and December 15 of each year during which the Trust Notes — Series 2019-A are outstanding thereafter, until the Maturity Date;

“Interest Period” means, initially, the period from and including the Closing Date to, but excluding March 15, 2020 and thereafter from and including each Interest Payment Date to, but excluding, the next following Interest Payment Date;

“Interest Reset Date” means September 15, 2029 and every March 15, June 15, September 15 and December 15  of each year during which any Trust Notes - Series 2019-A are outstanding thereafter until the Maturity Date, on which dates the interest rate on the Trust Notes — Series 2019-A will be reset as described on the Form of Fully Registered Trust Notes - Series 2019-A attached as Schedule 2.3 hereto;

“Interpolated Benchmark” with respect to the Benchmark means the rate determined for the Corresponding Tenor by interpolating on a linear basis between: (1) the Benchmark for the longest period (for which the Benchmark is available) that is shorter than the Corresponding Tenor and (2) the Benchmark for the shortest period (for which the Benchmark is available) that is longer than the Corresponding Tenor;

“ISDA Definitions” means the 2006 ISDA Definitions published by the International Swaps and Derivatives Association, Inc. or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time;

“ISDA Fallback Adjustment” means the spread adjustment, (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor;

“ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment;

“LIBOR” means, for any Interest Period, the rate for U.S. dollar borrowings appearing on page LIBOR01 of the Reuters Service (or on any successor or substitute page of such Service, or any successor to or substitute for such Service providing rate quotations comparable to those currently provided on such page of such Service, as determined by the Trust from time to time for purposes of providing quotations of interest rates applicable to U.S. dollar deposits in the London interbank market) at approximately 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period, as the rate for U.S. Dollar deposits with a maturity comparable to such Interest Period.  In the event that such rate is not available at such time for any reason, then “LIBOR” for such Interest Period shall be the rate at which U.S. dollar deposits of $5,000,000 and for a maturity comparable to such Interest Period are offered by the principal London office of an agent selected by the Trust in immediately available funds in the London interbank market at

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approximately 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period. Notwithstanding the foregoing, if the Issuer or its designee determine that a Benchmark Transition Event and related Benchmark Replacement Date have occurred with respect to three-month LIBOR, then the provisions of Section 2.5 of this Indenture with respect to a Benchmark Replacement shall govern;

“Maturity Date” means September 15, 2079;

“Moody’s” means Moody’s Investor Service, Inc.;

“Original Indenture” has the meaning ascribed to such term in the first recital to this supplemental indenture;

“Rating Event” means that the Trust or TCPL has received confirmation from S&P, Moody’s or Fitch that due to (i) any amendment to, clarification of, or change in hybrid capital methodology or a change in the interpretation thereof, in each case occurring or becoming effective after the date of issue of the Trust Notes — Series 2019-A; or (ii) the application of a different hybrid capital methodology or set of criteria by S&P, Moody’s or Fitch after the date of issue of the Trust Notes — Series 2019-A (due to any reason other than solely as a result of a decrease in the credit rating previously assigned to the Trust Notes — Series 2019-A, it being understood that for this purpose a “decrease in the credit rating previously assigned to the Trust Notes — Series 2019-A” means: (A) in the case of S&P, a rating below BBB; (B) in the case of Moody’s, a rating below Baa2; (C) in the case of Fitch, a rating below BBB; and (D) in the case of a designation by another rating agency, below an equivalent rating), the Trust Notes — Series 2019 A will no longer be eligible for the same or a higher amount of “equity credit” (or such other nomenclature that S&P, Moody’s or Fitch may then use to describe “equity credit”) attributed to the Trust Notes — Series 2019 A on the date of issue of the Trust Notes — Series 2019 A;

“Reference Time” means with respect to any determination of the Benchmark means (1) if the Benchmark is three-month LIBOR, 11:00 a.m. (London time) on the day that is two London banking days preceding the date of such determination, and (2) if the Benchmark is not three-month LIBOR, the time determined by the Issuer or its designee in accordance with the Benchmark Replacement Conforming Changes;

“Relevant Governmental Body” means the Federal Reserve Board and/or the Federal Reserve Bank of New York, or a committee officially endorsed or convened by the Federal Reserve Board and/or the Federal Reserve Bank of New York or any successor thereto;

“S&P” means S&P Global Ratings, acting through Standard & Poor’s Ratings Services (Canada), a business unit of S&P Global Canada Corp.;

“Share Exchange Agreement” means the Share Exchange Agreement entered into on the Closing Date among TCPL, the Issuer and the Exchange Trustee providing for, among other things, the respective rights and obligations of TCPL, the Issuer and the Holders of the Trust Notes - Series 2019-A with respect to the automatic exchange of the Trust Notes - Series 2019-A for rights to be issued TCPL Exchange Preferred Shares in connection with an Automatic Exchange;

“SOFR” with respect to any day means the secured overnight financing rate published for such day by the Federal Reserve Bank of New York, as the administrator of the benchmark, (or a successor administrator) on the Federal Reserve Bank of New York’s Website;

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“Successor Entity” has the meaning attributed to such term in section 6.2.1;

“Tax Event” means the Issuer, TCE or TCPL has received an opinion of independent counsel of a nationally recognized law firm in Canada or the United States experienced in such matters (who may be counsel to the Issuer, TCE or TCPL) to the effect that, as a result of, (i) any amendment to, clarification of, or change (including any announced prospective change) in, the laws, or any regulations thereunder, or any application or interpretation thereof, of Canada or the United States or any political subdivision or taxing authority thereof or therein, affecting taxation; (ii) any judicial decision, administrative pronouncement, published or private ruling, regulatory procedure, rule, notice, announcement, assessment or reassessment (including any notice or announcement of intent to adopt or issue such decision, pronouncement, ruling, procedure, rule, notice, announcement, assessment or reassessment) (collectively, an “administrative action”); or (iii) any amendment to, clarification of, or change in, the official position with respect to or the interpretation of any administrative action or any interpretation or pronouncement that provides for a position with respect to such administrative action that differs from the theretofore generally accepted position, in each of case (i), (ii) or (iii), by any legislative body, court, governmental authority or agency, regulatory body or taxing authority, irrespective of the manner in which such amendment, clarification, change, administrative action, interpretation or pronouncement is made known, which amendment, clarification, change or administrative action is effective or which interpretation, pronouncement or administrative action is announced on or after the date of issue of the Trust Notes - Series 2019-A, there is more than an insubstantial risk (assuming any proposed or announced amendment, clarification, change, interpretation, pronouncement or administrative action is effective and applicable) that (A) the Issuer, TCE or TCPL is, or may be, subject to more than a de minimus amount of additional taxes, duties or other governmental charges or civil liabilities because the treatment of any of its items of income, taxable income, expense, taxable capital or taxable paid-up capital with respect to the Trust Notes - Series 2019-A (including the treatment by the Issuer, TCE or TCPL of interest on the TCPL Sub Notes - Series 2019-A or the Trust Notes - Series 2019-A) or the treatment of the TCPL Sub Notes - Series 2019-A or other property of the Issuer, as or as would be reflected in any tax return or form filed, to be filed, or otherwise could have been filed, will not be respected by a taxing authority, (B) the Issuer is, or will be, subject to more than a de minimus amount of taxes, duties or other governmental charges or civil liabilities, or (C) any payment of interest, consideration or otherwise in respect of the TCPL Sub Notes - Series 2019-A or the Trust Notes - Series 2019-A gives rise to more than a de minimus amount of withholding tax for the Issuer, TCE or TCPL and/or that results in the requirement to pay more than a de minimus amount of Additional Amounts under Section 2.7;

“TCE” means TC Energy Corporation and includes its successors and assigns;

“TCPL” means TransCanada PipeLines Limited and includes its successors and assigns;

“TCPL Deferral Preferred Shares” means each series of the first preferred shares of TCPL to be issued to the Holders of Trust Notes - Series 2019-A in respect of a Deferral Event;

“TCPL Exchange Preferred Shares” means the first preferred shares of TCPL to be issued to Holders of Trust Notes - Series 2019-A in respect of an Automatic Exchange;

“TCPL Sub Note — Series 2019-A” means the junior subordinated notes Series 2019-A issued by TCPL to the Trust (in an initial principal amount, on the date hereof, of $1,100,000,000);

“Term SOFR” means the forward-looking term rate for the applicable Corresponding Tenor based on SOFR that has been selected or recommended by the Relevant Governmental Body;

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“this supplemental indenture”, “hereto”, “hereby”, “hereunder”, “hereof”, “herein” and similar expressions refer to this supplemental indenture and not to any particular article, section, subdivision or other portion hereof, and include any and every supplemental indenture;

“Time of Automatic Exchange” has the meaning ascribed to such term in the Share Exchange Agreement;

“Trust Notes - Series 2019-A” means the up to U.S.$1,100,000,000 principal amount of Trust Notes - Series 2019-A due September 15, 2079 issued by the Issuer hereunder; and

“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment.

Words importing the singular include the plural and vice versa and words importing the masculine gender include the feminine gender and vice versa.

1.2Interpretation Not Affected By Headings, etc.

The division of this supplemental indenture into Articles and Sections, the provision of a table of contents and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this supplemental indenture.

1.3Incorporation of Certain Definitions

All terms contained in this supplemental indenture which are defined in the Original Indenture, as supplemented and amended to the date hereof, shall, for all purposes hereof, have the meanings given to such terms in the Original Indenture, as so supplemented and amended, unless otherwise defined herein or unless the context otherwise specifies or requires.

1.4Definition of “this Indenture”

The term “this Indenture”, whenever used herein, means the Original Indenture as supplemented and amended by this supplemental indenture.

1.5Currency References

All references to dollar ($) amounts shall, unless otherwise expressly indicated herein, be to United States dollars.

1.6Appointment of Exchange Trustee under the Share Exchange Agreement

Each Holder of Trust Notes — Series 2019-A, by such Holder’s acceptance thereof, hereby appoints AST Trust Company (Canada), and any successor thereto or permitted assignee thereof, to act for and on its behalf under and for the purposes contemplated in the Share Exchange Agreement as the “Exchange Trustee” thereunder and to agree to and perform its obligations as a “Holder” under the Share Exchange Agreement in accordance with the terms thereof, and hereby irrevocably and unconditionally authorizes and directs such “Exchange Trustee” to take such actions as may be necessary or appropriate to give effect to the terms of the Share Exchange Agreement (including the Automatic Exchange) and hereby appoints the “Exchange Trustee” as such Holder’s attorney-in-fact for any and all related and incidental purposes.

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1.7Appointment of the Indenture Trustee

Each Holder of Trust Notes — Series 2019-A, by such Holder’s acceptance thereof, hereby appoints the Trustee, and any successor thereto or permitted assignee thereof, to act for and on its behalf under and for the purposes contemplated in the Assignment and Set-Off Agreement and to agree to and perform its obligations as a “Holder” under the Assignment and Set-Off Agreement in accordance with the terms thereof, and hereby irrevocably and unconditionally authorizes and directs the Trustee to take such actions as may be necessary or appropriate to give effect to the terms of the Assignment and Set-Off Agreement (including the Deferral Event Subscription and the Deferral Event Subscription Proceeds Assignment contemplated thereunder) and hereby appoints the Trustee as such Holder’s attorney-in-fact for any and all related and incidental purposes.

1.8Additional Provisions Relating to the Trust Notes — Series 2019-A.

1.8.1For the purposes of this supplemental indenture, and the Trust Notes — Series 2019-A:

“Business Day” means a day on which TCPL and the Trustee are open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

1.8.2For the purposes of this supplemental indenture, and the Trust Notes — Series 2019-A, the restrictions set forth in Section 8.1 of the Original Indenture shall be supplemented by a requirement that the Issuer shall not merge, amalgamate, consolidate or otherwise combine with any other Person or convey, transfer or lease all or substantially all of its assets to any Person, unless, if the Successor Entity is organized under the laws of a jurisdiction other than the laws of Canada or any province of territory thereof or the United States, any state thereof or the District of Columbia, such Successor Entity shall assume the Issuer’s obligations under this supplemental indenture to pay Additional Amounts, with the name of such successor jurisdiction being included in addition to Canada in each place that Canada appears in Section 2.7.1.

1.8.3For the purposes of this supplemental indenture, and the Trust Notes — Series 2019-A, in addition to the events set forth in Section 6.1.1 of the Original Indenture, each of the following events is an “Event of Default”:

1.8.3.1if an order is made or an effective resolution is passed for the winding-up or liquidation of TCPL, except in the course of carrying out or pursuant to a transaction in respect of which the conditions of Article 8 of the Original Indenture are duly observed and performed, or in the event of any other dissolution of TCPL, by operation of law; or

1.8.3.2if TCPL makes a general assignment for the benefit of its creditors, or otherwise acknowledges its insolvency, becomes insolvent or is declared bankrupt or consents to the institution of bankruptcy or insolvency proceedings against it under any bankruptcy, insolvency or analogous laws or if a custodian, sequestrator, liquidator, receiver, receiver and manager or any other officer with similar powers is appointed of TCPL or of the property of TCPL or any part thereof which is, in the opinion of the Trustee, a substantial part thereof.

1.8.4For the purposes of this supplemental indenture, and the Trust Notes—Series 2019-A, with respect to any matter affecting the Trust Notes—Series 2019-A or rights of the Holders thereof, “Extraordinary Resolution” means (i) the written consent of Holders of not less than a majority of the aggregate principal amount of the Trust Notes — Series 2019-A; or (ii) an

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extraordinary resolution proposed at a meeting of Holders of the Trust Notes — Series 2019-A where Holders of not less than a majority of the aggregate principal amount of the Trust Notes — Series 2019-A are represented in person or by proxy (or a lesser amount of holders if such meeting has been dissolved and reconvened due to failure to achieve quorum in the manner specified in the Original Indenture) and passed by the favourable votes of Holders of the Trust Notes — Series 2019-A representing not less than 66 2/3% of the aggregate principal amount of the Trust Notes — Series 2019-A represented at the meeting.

ARTICLE 2

THE TRUST NOTES — SERIES 2019-A

2.1Limitation on Issue and Designation

The aggregate principal amount of the Trust Notes - Series 2019-A that may be issued and certified hereunder shall be limited to up to $1,100,000,000 principal amount of the Trust Notes designated as “Trust Notes - Series 2019-A due September 15, 2079”. The issuance of the Trust Notes - Series 2019-A shall be subject to compliance with the terms and conditions of the 1970 Indenture relating to the creation, assumption or incurring of Funded Obligations (as such term is defined in the 1970 Indenture).

2.2Terms of Trust Notes — Series 2019-A

2.2.1The Trust Notes - Series 2019-A shall be dated as of the Closing Date, regardless of their actual date of issue, and shall mature on the Maturity Date.

2.2.2Subject to Section 2.2.5 below, from the Closing Date to, but excluding September 15, 2029, the Trust Notes - Series 2019-A will bear interest at the rate of 5.50% per annum, payable in arrears in equal semi-annual payments on each Interest Payment Date, to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1 or September 1, respectively, with the first payment on March 15, 2020. Notwithstanding the foregoing, the initial interest payment payable on March 15, 2020, will be $27.96 per $1,000 principal amount of the Trust Notes - Series 2019-A.  Subject to any Benchmark Replacement Conforming Changes, from September 15, 2029 and on every Interest Reset Date thereafter until September 15, 2079, the interest rate on the Trust Notes - Series 2019-A will be reset as follows: (i) starting on September 15, 2029, until September 15, 2049 at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 4.154%, payable in arrears on each Interest Payment Date to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2029 and (ii) starting on September 15, 2049 until September 15, 2079 at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 4.904%, payable in arrears on each Interest Payment Date to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2049. Subject to Article 5, interest as aforesaid shall be payable after as well as before default, with interest on overdue interest, in like money, at the same rates and on the same dates.

2.2.3Interest for each Interest Period from the Closing Date to, but excluding, September 15, 2029, will be calculated on the basis of a 360-day year consisting of twelve 30-day months. Subject to any Benchmark Replacement Conforming Changes, interest for each Interest Period from September 15, 2029 to the Maturity Date will be calculated on the basis of the actual

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number of days elapsed during each such Interest Period and a 360-day year. For the purposes of disclosure under the Interest Act (Canada), and without affecting the interest payable on the Trust Notes - Series 2019-A, whenever the interest rate on the Trust Notes - Series 2019-A is to be calculated on the basis of a period of less than a calendar year, the yearly interest rate equivalent for such interest rate will be the interest rate multiplied by the actual number of days in the relevant calendar year and divided by the number of days used in calculating the specified interest rate.

2.2.4If any Interest Payment Date would otherwise fall on a day which is not a Business Day, payment shall be postponed until the next Business Day, and no further interest or other sums will accrue in respect of such postponement.

2.2.5After the Closing Date, subject to the limit in Section 2.1, the Issuer shall be entitled to issue additional Trust Notes-Series 2019-A (“Additional Trust Notes-Series 2019-A”), which shall have identical terms as the Trust Notes-Series 2019-A issued on the Closing Date, other than with respect to their issue date, issue price and, if applicable, their first interest payment date and interest accrual date.

2.2.6With respect to any Additional Trust Notes-Series 2019-A, the Issuer shall set forth in an Officer’s Certificate, a copy of which shall be delivered to the Trustee, the following information:

2.2.6.1the aggregate principal amount of such Additional Trust Notes-Series 2019-A to be authenticated and delivered pursuant to this Indenture; and

2.2.6.2the issue price, the issue date and the CUSIP number of such Additional Trust Notes-Series 2019-A; provided, however, that if Additional Trust Notes-Series 2019-A are issued with the same CUSIP number as any other Trust Notes-Series 2019-A previously issued under this supplemental Indenture, then such Additional Trust Notes-Series 2019-A shall be issued at a price that would not prevent such Additional Trust Notes-Series 2019-A from being treated as fungible with such previously-issued Trust Notes-Series 2019-A for U.S. federal income tax purposes; and

2.2.6.3if applicable, the first interest payment date and interest accrual date of such Additional Trust Notes-Series 2019-A.

2.3Form of Trust Notes - Series 2019-A

2.3.1Subject to Section 2.11 of the Original Indenture, the Trust Notes - Series 2019-A shall be issued only as fully registered Trust Notes - Series 2019-A in denominations of $1,000 and integral multiples thereof.

2.3.2The Trust Notes - Series 2019-A and the certificate of the Trustee endorsed thereon shall be in the English language (and may be in the French language) and shall be substantially in the form set out in Schedule 2.3 hereto, with such appropriate additions, deletions, substitutions and variations as the Trustee may approve (or as may be required to issue Additional Trust Notes-Series 2019-A pursuant to Section 2.2.5) and shall bear such distinguishing letters and numbers as the Trustee may approve, such approval of the Trustee to be conclusively evidenced by its certification of the Trust Notes - Series 2019-A. In the event that any provision of the Trust Notes - Series 2019-A in the French language, if any, shall be susceptible to an interpretation different from the equivalent provision in the English language, the interpretation of such provision in the English language shall be determinative.

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2.3.3The Trust Notes - Series 2019-A may be engraved, printed or lithographed, or partly in one form and partly in another, as the Issuer may determine.

2.4Registrar and Transfer Agent, Paying Agent and Calculation Agent

The Issuer hereby appoints the Trustee as the registrar and transfer agent and paying agent of the Trust Notes - Series 2019-A and the Trustee hereby accepts such appointment. The Issuer hereby appoints the Trustee as the calculation agent to determine the amount of floating rate interest payable on the Trust Notes - Series 2019-A from and after September 15, 2029 and the Trustee hereby accepts such appointment.

2.5Benchmark Determination

2.5.1Prior to the occurrence of a Benchmark Transition Event and related Benchmark Replacement Date with respect to three-month LIBOR, the Benchmark will be LIBOR, and, on each Interest Reset Date, the Trustee, as calculation agent, will notify the Issuer by email of the Benchmark for the related Interest Period. If the Benchmark is any rate other than three-month LIBOR, on each Interest Reset Date, the Issuer will notify the Trustee by email of the Benchmark for the related Interest Period. For the purposes of this Section 2.5.1, and notwithstanding anything to the contrary in Article 10 of the Original Indenture, notice shall be valid and effective if given to the Issuer by email at corpsec_filingdesk@transcanada.com or to the Trustee by email at corporatetrustservices@astfinancial.com, and in each case shall be deemed to have been given on the date and at the time of its having been sent by email, and each of the Trustee and the Issuer may, from time to time, change its email address for notice under this Section 2.5.1 by delivering notice thereof to the other party in the manner provided by this Section 2.5.1 or in the manner provided by Article 10 of the Original Indenture.

2.5.2If the Issuer or its designee determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred prior to the Reference Time in respect of any determination of the Benchmark on any date, the Benchmark Replacement will replace the then-current Benchmark for all purposes relating to the Trust Notes — Series 2019-A in respect of such determination on such date and all determinations on all subsequent dates.

2.5.3In connection with the implementation of a Benchmark Replacement, the Issuer or its designee will have the right to make Benchmark Replacement Conforming Changes from time to time.

2.5.4Any determination, decision or election that may be made by the Issuer or its designee pursuant to this Section 2.5 including any determination with respect to a tenor, rate or adjustment or of the occurrence or non-occurrence of an event, circumstance or date and any decision to take or refrain from taking any action or any selection, will be conclusive and binding absent manifest error, may be made in the Issuer’s or its designee’s sole discretion, and, notwithstanding anything to the contrary herein or in any other documentation relating to the Trust Notes — Series 2019-A, shall become effective without consent from the Holders of the Trust Notes — Series 2019-A or any other party.

2.6Rights of Set-Off

Notwithstanding Section 4.8 of the Original Indenture, each party may set-off against amounts owing by it hereunder to another Person any amounts owing or accruing due by such Person to it or any of

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its Affiliates, without duplication, including pursuant to the Share Exchange Agreement and the Assignment and Set-Off Agreement.

2.7Additional Amounts

2.7.1All payments made by or on account of any obligation of the Issuer under or with respect to the Trust Notes — Series 2019-A, or by or on account of any obligation of the Credit Supporter under or with respect to the Guarantee, shall be made free and clear of and without withholding or deduction for, or on account of, any present or future tax, duty, levy, impost, assessment or other governmental charge (including penalties, interest and other liabilities related thereto) imposed or levied by or on behalf of the Government of Canada or any province or territory thereof or by any authority or agency therein or thereof having power to tax (hereinafter, “Canadian Taxes”), unless the Issuer or the Credit Supporter is required to withhold or deduct Canadian Taxes by law or by the interpretation or administration thereof by the relevant government authority or agency. If the Issuer or the Credit Supporter is so required to withhold or deduct any amount for or on account of Canadian Taxes from any payment made under or with respect to the Trust Notes — Series 2019-A or the Guarantee, the Issuer or the Credit Supporter shall pay as additional interest such additional amounts (“Additional Amounts”) as may be necessary so that the net amount received by each Holder (including Additional Amounts) after such withholding or deduction shall not be less than the amount the Holder would have received if such Canadian Taxes had not been withheld or deducted; provided, however, that no Additional Amounts shall be payable with respect to a payment made to a Holder (an “Excluded Holder”) in respect of a beneficial owner (i) with which the Issuer or the Credit Supporter does not deal at arm’s length (for purposes of the Income Tax Act (Canada)) at the time the amount is paid or payable, (ii) where the payment is in respect of a debt or other obligation to pay an amount to a person with whom the payor is not dealing at arm’s length for the purposes of the Income Tax Act (Canada),  (iii) which is subject to such Canadian Taxes by reason of such Holder’s failure to comply with any certification, identification, information, documentation or other reporting requirement if compliance is required by law, regulation, administrative practice or an applicable treaty as a precondition to exemption from, or a reduction in, the rate of deduction or withholding of, such Canadian Taxes, (iv) where all or any portion of the amount paid to such Holder is deemed to be a dividend paid to such Holder pursuant to subsection 214(16) of the Income Tax Act (Canada), or (v) which is subject to such Canadian Taxes by reason of its carrying on business in or being connected with Canada or any province or territory thereof otherwise than by the mere holding of Trust Notes — Series 2019-A or the receipt of payments thereunder. The Issuer or the Credit Supporter shall make such withholding or deduction and remit the full amount deducted or withheld to the relevant authority as and when required under applicable law.

2.7.2If a Holder has received a refund or credit for any Canadian Taxes with respect to which the Issuer or the Credit Supporter has paid Additional Amounts pursuant to this Section 2.7, such Holder shall pay over such refund to the Issuer or the Credit Supporter (but only to the extent of such Additional Amounts), net of all out-of-pocket expenses of such Holder, together with any interest paid by the relevant tax authority in respect of such refund.

2.7.3If Additional Amounts are required to be paid under this Section 2.7 as a result of a Tax Event, the Issuer may elect to redeem outstanding Trust Notes — Series 2019-A pursuant to Section 3.3.

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ARTICLE 3

REDEMPTION AND PURCHASE FOR CANCELLATION OF THE TRUST NOTES — SERIES 2019-A

3.1Redemption of Trust Notes - Series 2019-A at the Option of the Issuer

On or after September 15, 2029, the Issuer may, at its option or at the direction of TCPL, redeem the Trust Notes — Series 2019-A in whole at any time or in part from time to time on any Interest Payment Date and on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders, at a redemption price per $1,000 principal amount of the Trust Notes - Series 2019-A equal to par, together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.2Partial Redemption of Trust Notes - Series 2019-A

3.2.1If less than all the Trust Notes — Series 2019-A are to be redeemed pursuant to Section 3.1, the Issuer shall, at least 15 days prior to the date that notice of redemption is given, notify the Trustee by Written Order of the Issuer of its intention to redeem the aggregate principal amount of the Trust Notes - Series 2019-A to be redeemed. The Trust Notes - Series 2019-A to be redeemed shall be selected by the Trustee on a pro rata basis, disregarding fractions, according to the principal amount of the Trust Notes - Series 2019-A registered in the respective names of each Holder, or in such other manner as the Trustee may consider equitable, provided that such selection shall be proportionate (to the nearest minimum authorized denomination for the Trust Notes - Series 2019-A established pursuant to Section 2.3).

3.2.2If the Trust Notes - Series 2019-A in denominations in excess of the minimum authorized denomination for the Trust Notes - Series 2019-A are selected and called for redemption in part only (such part being that minimum authorized denomination or an integral multiple thereof) then, unless the context otherwise requires, references to the Trust Notes - Series 2019-A in this Article 3 shall be deemed to include any such part of the principal amount of the Trust Notes - Series 2019-A which shall have been so selected and called for redemption. The Holder of any Trust Notes - Series 2019-A called for redemption in part only, upon surrender of such Trust Notes - Series 2019-A for payment, shall be entitled to receive, without expense to such Holder, new Trust Notes - Series 2019-A for the unredeemed part of the Trust Notes - Series 2019-A so surrendered, and the Issuer shall execute and the Trustee shall certify and deliver, at the expense of the Issuer, such new Trust Notes - Series 2019-A having the same terms as are set out herein upon receipt from the Trustee or the Paying Agent of the Trust Notes - Series 2019-A so surrendered.

3.3Early Redemption upon a Tax Event

The Issuer may, at its option, redeem all (but not less than all) of the Trust Notes - Series 2019-A upon the occurrence of a Tax Event on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders.  The redemption price per $1,000 principal amount of the Trust Notes - Series 2019-A shall be equal to par together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.4Early Redemption upon Rating Event

The Issuer may, at its option, redeem all (but not less than all) of the Trust Notes - Series 2019-A at any time upon or following the occurrence of a Rating Event on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders.  The redemption price per

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$1,000 principal amount of the Trust Notes - Series 2019-A shall be equal to par plus $20 together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.5Notice of Redemption

Subject to Section 4.2, notice of any intention to redeem any Trust Notes - Series 2019-A shall be given by or on behalf of the Issuer to the Holders of the Trust Notes - Series 2019-A which are to be redeemed, not more than 60 days and not less than 30 days prior to the date fixed for redemption, in the manner provided in the Original Indenture. The notice of redemption shall, unless all the Trust Notes - Series 2019-A then outstanding are to be redeemed, specify the distinguishing letters and numbers of the Trust Note - Series 2019-A which are to be redeemed and, if a Trust Notes - Series 2019-A is to be redeemed in part only, shall specify that part of the principal amount thereof to be redeemed, and shall specify the redemption date, the redemption price and places of payment and shall state that all interest on the Trust Notes - Series 2019-A called for redemption shall cease from and after such redemption date.

3.6Purchase of the Trust Notes - Series 2019-A for Cancellation

3.6.1The Issuer may, upon the direction of TCPL, purchase all or any of the Trust Notes - Series 2019-A in the open market (which may include purchases from or through an investment dealer or a firm holding membership on or that is a participant of a recognized stock exchange) or by invitation for tenders or by private contract and, in each case, at any price, payable in cash.

3.6.2If, upon an invitation for tenders, more Trust Notes - Series 2019-A than the Issuer is willing to purchase are tendered at the same lowest price, the Trust Notes - Series 2019-A to be purchased by the Issuer shall be selected by the Trustee pro rata, or in such other manner as the Trustee may consider equitable in compliance with applicable law, from the Trust Notes - Series 2019-A tendered by each Holder who tendered at such lowest price. For this purpose, the Trustee may make, and from time to time amend, regulations with respect to the manner in which the Trust Notes - Series 2019-A may be so selected and regulations so made shall be valid and binding upon all Holders, notwithstanding the fact that, as a result thereof, one or more of such Trust Notes - Series 2019-A become subject to purchase in part only. The Holder of any Trust Notes - Series 2019-A of which a part only is purchased, upon surrender of such Trust Notes - Series 2019-A for payment, shall be entitled to receive, without expense to such Holder, one or more new Trust Notes - Series 2019-A for the unpurchased part so surrendered and the Trustee shall certify and deliver such new Trust Notes - Series 2019-A upon receipt of the Trust Notes - Series 2019-A so surrendered.

3.7Cancellation of the Trust Notes - Series 2019-A

All Trust Notes - Series 2019-A redeemed and all Trust Notes - Series 2019-A purchased under this Article 3 shall forthwith be delivered to the Trustee and shall be cancelled by it and will not be reissued or resold, and except as provided in subsection 3.6.2, no Trust Notes - Series 2019-A shall be issued in substitution therefor.

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ARTICLE 4

AUTOMATIC EXCHANGE

4.1Automatic Exchange

4.1.1On the occurrence of an Automatic Exchange Event, whether before or after the occurrence of any Event of Default, each Holder of Trust Notes — Series 2019-A then outstanding shall give full effect to the Automatic Exchange pursuant to and in accordance with the Share Exchange Agreement.  To that end, in accordance with the Share Exchange Agreement, all Trust Notes — Series 2019-A held by a Holder shall be deemed to have been automatically exchanged and transferred to TCPL at a price, for each $1,000 principal amount of Trust Notes — Series 2019-A, equal to one newly issued and fully paid TCPL Exchange Preferred Share with a stated issue price of $1,000 per share, together with such number of TCPL Exchange Preferred Shares (including fractional shares, where applicable) calculated by dividing the amount of accrued and unpaid interest on each $1,000 principal amount of Trust Notes — Series 2019-A from the immediately preceding Interest Payment Date to, but excluding, the date of the Automatic Exchange Event, by $1,000.  As full and final payment of such price, in accordance with the Share Exchange Agreement, a Holder of Trust Notes — Series 2019-A shall receive, and be deemed to have received and accepted, as of the Time of Automatic Exchange, the right to be issued one newly issued and fully paid TCPL Exchange Preferred Share with a stated issue price of $1,000 per share, together with such number of TCPL Exchange Preferred Shares (including fractional shares, where applicable) calculated by dividing the amount of accrued and unpaid interest on each $1,000 principal amount of Trust Notes — Series 2019-A from the immediately preceding Interest Payment Date to, but excluding, the date of the Automatic Exchange Event by $1,000, per $1,000 principal amount of Trust Notes — Series 2019-A held by the Holder.  The foregoing exchange, transfer, receipt and acceptance shall be automatically effected in accordance with the Share Exchange Agreement and shall not require any conveyance, confirmation or further action being taken by the Trust, the Exchange Trustee or the Holders in order to give full effect to same.  For greater certainty, any Trust Notes — Series 2019-A purchased or redeemed by the Trust prior to the Time of Automatic Exchange shall be deemed not to be outstanding, and shall not be subject to the Automatic Exchange.

4.1.2Pursuant to the Share Exchange Agreement, as of the Time of Automatic Exchange and on a basis consistent with the terms of this Agreement, each Holder of Trust Notes — Series 2019-A shall be deemed to have exchanged and transferred to TCPL all of such Holder’s right, title and interest in and to the Trust Notes — Series 2019-A registered in its name and shall thereupon cease to be a Holder of such Trust Notes — Series 2019-A and all rights of such Holder as a debtholder of the Trust shall cease, and each Holder shall thereupon and thereafter be deemed hereunder to be entitled to receive the corresponding number of TCPL Exchange Preferred Shares (including fractional shares, where applicable) contemplated in Section 3.3 of the Share Exchange Agreement.

4.2Redemption by Issuer following Automatic Exchange

4.2.1This Section shall apply to any redemption by the Issuer of the Trust Notes - Series 2019-A following an Automatic Exchange in the circumstances described in subsection 4.2.2 and shall apply in accordance with its terms notwithstanding the subordination provisions of Article 4 of the Original Indenture and Article 6 hereof, which shall not apply in the case of such a redemption.  For greater certainty, redemption by the Issuer under this Section 4.2 may occur at any time after the Closing Date, including prior to September 15, 2029.

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4.2.2Subject to subsection 4.2.3, if for any reason an Automatic Exchange does not result in the exchange of all Trust Notes - Series 2019-A then outstanding for the right to be issued TCPL Exchange Preferred Shares (including fractional shares, where applicable) in accordance with the Share Exchange Agreement, the Issuer shall, without any requirement for notice or further action on the part of any Person, forthwith redeem all such Trust Notes - Series 2019-A not so exchanged for consideration consisting of one TCPL Exchange Preferred Share per $1,000 principal amount of the Trust Notes - Series 2019-A, together with the number of TCPL Exchange Preferred Shares (including fractional shares, where applicable) calculated by dividing the amount of accrued and unpaid interest on each $1,000 principal amount of the Trust Notes - Series 2019-A from, and including, the immediately preceding Interest Payment Date to, but excluding, the date of the Automatic Exchange Event by $1,000.  For this purpose, the Issuer shall exercise the “Series 2019-A Subscription Right” pursuant to the Share Exchange Agreement to require TCPL to issue to the Issuer sufficient TCPL Exchange Preferred Shares (including fractional shares, where applicable) to complete and give effect to such redemption.  The Trust Notes - Series 2019-A redeemed pursuant to this subsection 4.2.2 shall be cancelled and shall not be reissued.

4.2.3The Issuer need not give notice of redemption prior to the exercise of the foregoing rights of redemption if TCPL has given an Automatic Exchange Event Notice. The redemption will be deemed to have been effected and the consideration paid at the Time of Automatic Exchange.  From and after the Time of Automatic Exchange, each Holder of the Trust Notes - Series 2019-A (if any) whose Trust Notes - Series 2019-A were for any reason not exchanged for TCPL Exchange Preferred Shares by the operation of the Automatic Exchange and instead were redeemed by the Trust under this Section, shall automatically cease to be a Holder and instead shall, subject to Section 4.3, be entitled only to receive TCPL Exchange Preferred Shares (including fractional shares, where applicable) or such other consideration as is contemplated herein in respect of such Trust Notes - Series 2019-A held by such Holder.

4.3Right not to Deliver the TCPL Exchange Preferred Shares

4.3.1Pursuant to the Share Exchange Agreement, on an Automatic Exchange or a redemption of the Trust Notes - Series 2019-A following an Automatic Exchange Event, TCPL has reserved the right not to issue TCPL Exchange Preferred Shares to any Ineligible Person.  In those circumstances, TCPL shall issue to the Trustee, and the Trustee shall hold, all TCPL Exchange Preferred Shares (including fractional shares, where applicable) that would otherwise be delivered to the Ineligible Persons, and the Trustee shall deliver such shares to a broker retained by TCPL for the purpose of effecting the sale (to Persons other than TCPL, its Affiliates and other Ineligible Persons) on behalf of such Ineligible Persons of such TCPL Exchange Preferred Shares.  Those sales (if any) may be made at any time and at any price and none of the Trust, the Trustee or TCPL shall be subject to any liability for failing to sell such TCPL Exchange Preferred Shares on behalf of any such Ineligible Persons or at any particular price on any particular day.  The net proceeds received by the Trustee from the sale of any such TCPL Exchange Preferred Shares shall be divided, in accordance with the Share Exchange Agreement, among the Ineligible Persons in proportion to the number of TCPL Exchange Preferred Shares that would otherwise have been delivered to them, after deducting the costs of sale and any applicable withholding taxes.  The Trustee shall make payment of the aggregate net proceeds to DTC (if the Trust Notes — Series 2019-A are then held in the book-entry only system) in accordance with the customary practices and procedures of DTC or in all other cases to such Ineligible Persons, or such other registrar and transfer agent who may have been appointed in respect of the Trust Notes — Series 2019-A in accordance with the terms of the Original Indenture, for distribution to such Ineligible Persons, in each case, in accordance with customary practices and procedures of the Trustee or the registrar and transfer agent, as applicable.

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ARTICLE 5

DEFERRAL RIGHT

5.1Application of Interest

On each Deferral Date, and notwithstanding the subordination provisions of Article 4 of the Original Indenture and Article 6 hereof which shall not apply in the case of a Deferral Event Subscription, interest payable in respect of the Trust Notes — Series 2019-A on such Interest Payment Date to Holders of Trust Notes — Series 2019-A shall be paid by the Trust as Deferral Event Subscription Proceeds to give effect to the related Deferral Event Subscription Proceeds Assignment by each Holder in order to complete each such Holder’s obligations in respect of the related Deferral Event Subscription.  Pursuant to the Assignment and Set-Off Agreement, such Deferral Event Subscription Proceeds Assignment shall constitute the full and final payment by the Holders for and in respect of the purchase price payable by each Holder in relation to its related Deferral Event Subscription and TCPL is required to issue and deliver to each Holder (in the manner contemplated in the Assignment and Set-Off Agreement) a number of TCPL Deferral Preferred Shares (including fractional shares, if applicable) calculated by dividing (a) the amount of the interest payment on the Trust Notes — Series 2019-A that has not been paid in cash to such Holder on the Deferral Date, by (b) the stated issue price of the applicable series of TCPL Deferral Preferred Shares.

5.2Acknowledgement of Holders

Each Deferral Event Subscription shall be effected by the Trustee, acting pursuant to the Assignment and Set-Off Agreement, on behalf of the applicable Holders and TCPL.  The provisions of the Assignment and Set-Off Agreement are hereby acknowledged and deemed accepted by Holders of Trust Notes — Series 2019-A, by and through the Indenture Trustee acting as bare trustee and nominee in accordance with and subject to the terms of the Assignment and Set-Off Agreement.

5.3No Limit

There shall be no limit on the number of Deferral Events that may occur.

5.4Right not to Deliver the TCPL Deferral Preferred Shares

Pursuant to the Assignment and Set-Off Agreement, upon a Deferral Event, TCPL has the right not to issue TCPL Deferral Preferred Shares to any Ineligible Person.  In those circumstances, TCPL will issue to the Trustee, and the Trustee shall hold, all TCPL Deferral Preferred Shares (including fractional shares, where applicable) that would otherwise be delivered to Ineligible Persons, and the Trustee shall deliver such shares to a broker retained by TCPL for the purpose of effecting the sale (to Persons other than TCPL and its Affiliates or other Ineligible Persons) on behalf of such Ineligible Persons of such TCPL Deferral Preferred Shares.  Such sales, if any, may be made at any time and at any price and none of the Trust, the Trustee or TCPL will be subject to any liability for failing to sell such TCPL Deferral Preferred Shares on behalf of any such Ineligible Persons or at any particular price on any particular day.  The net proceeds received by the Trustee from the sale of any such TCPL Deferral Preferred Shares shall be divided among the Ineligible Persons in proportion to the number of TCPL Deferral Preferred Shares that would otherwise have been delivered to them, after deducting any related costs of sale and any applicable withholding taxes.  The Trustee shall make payment of the aggregate net proceeds to DTC (if the Trust Notes - Series 2019-A are then held in the DTC book-entry only system) in accordance with the customary practices and procedures of DTC or in all other cases to such Ineligible Persons, or such other registrar and transfer agent who may have been appointed in respect of the Trust Notes — Series 2019-A in accordance with the terms

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of the Original Indenture, for distribution to such Ineligible Persons, in each case, in accordance with customary practices and procedures of the Trustee or the registrar and transfer agent, as applicable.

ARTICLE 6

GUARANTEE

6.1Guarantee of Trust Notes — Series 2019-A

6.1.1The Credit Supporter hereby guarantees, on a subordinated basis as provided herein, the due and punctual payment of the principal amount of and interest on (including, in case of default, interest on the amount in default) the Trust Notes - Series 2019-A when and as the same becomes due and payable, whether at their respective due dates, on redemption or otherwise, in each case in accordance with the terms of the Trust Notes - Series 2019-A, the Original Indenture and this supplemental indenture.  The Credit Supporter also hereby guarantees, on a subordinated basis as provided herein, the performance by the Trust of its obligations (if any) to and in favour of the Holders of the Trust Notes - Series 2019-A, pursuant to the Share Exchange Agreement (including in respect of the Automatic Exchange) and the Assignment and Set-Off Agreement (including in respect of the Deferral Event Subscription and the Deferral Event Subscription Proceeds Assignment).  The Guarantee shall be a direct, unsecured, subordinated obligation of the Credit Supporter as provided herein.  For greater certainty, (a) in the event of an Automatic Exchange, the entitlement of the Holders is solely to receive TCPL Exchange Preferred Shares as contemplated in Article 4, (b) in the event of a Deferral Event, the Holders shall be required to complete the applicable Deferral Event Subscription, and (c) in such events, the Guarantee shall be a guarantee with respect to the delivery of TCPL Exchange Preferred Shares or TCPL Deferral Preferred Shares, as applicable, and the completion, validity and enforceability of the Automatic Exchange or the Deferral Event Subscription shall not be limited or affected by this Guarantee.

6.1.2The Credit Supporter agrees that the Trustee and each of the Holders may grant extensions of time or other indulgences, take and give up securities, accept compositions, grant releases and discharges and otherwise deal with the Issuer and other parties and securities as the Trustee or such Holder may see fit and may apply all monies received from the Issuer or others or from securities upon such part of the Issuer’s liability under this supplemental indenture as the Trustee may think best without prejudice to or in any way limiting or lessening the liability of the Credit Supporter under this supplemental indenture.

6.1.3None of the Trustee or the Holders shall be bound to exhaust its recourse against the Issuer before being entitled to payment from the Credit Supporter under this supplemental indenture.

6.1.4Any loss of or in respect of the securities received by the Trustee or any of the Holders from the Issuer or any other Person, whether occasioned through the fault of the Trustee or a Holder, or otherwise, shall not discharge pro tanto or limit or lessen the liability of the Credit Supporter under this supplemental indenture.

6.1.5Any change or changes in the name of the Issuer shall not affect or in any way limit or lessen the liability of the Credit Supporter hereunder.

6.1.6All monies in fact borrowed or obtained by the Issuer upon the issue of the Trust Notes - Series 2019-A under this supplemental indenture shall be deemed to form part of the liabilities hereby guaranteed notwithstanding any limitation of status or of power of the Issuer or

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agents of the Issuer or that the Issuer may not be a legal entity or any irregularity, defect or informality in the borrowing or obtaining of such monies.

6.1.7Any account settled or stated by or between the Trustee on behalf of the Holders and the Issuer in relation to this supplemental indenture shall be accepted by the Credit Supporter as conclusive evidence that the balance or amount thereby appearing due by the Issuer is so due, absent manifest error or proof to the contrary.

6.1.8The Credit Supporter shall make payment to the Trustee on behalf of the Holders of the amount of the liability of the Credit Supporter, forthwith after demand therefor is made in writing, and in any event within 15 days of any failure by the Issuer to make a payment as stipulated herein, and such demand shall be conclusively deemed to have been effectually made when made in accordance with Section 6.4 below.

6.1.9The Guarantee provided under this supplemental indenture is in addition to and without prejudice to any securities of any kind (including, guarantees and postponement agreements, whether or not in the same form as this instrument) now or hereafter held by the Trustee on behalf of the Holders.

6.1.10In the event that pursuant to any applicable statute or common law, the amount of any payment made hereunder by the Credit Supporter to the Trustee or any of the Holders (including actual or imputed interest thereon) must be repaid by the Trustee or such Holder to the Credit Supporter, whether by virtue of any fraudulent preference or conveyance legislation or otherwise howsoever, the Credit Supporter shall remain liable hereunder for the amount of such repayment notwithstanding any prior termination or release of the Guarantee by the Trustee and any such prior termination or release shall at all times be and be treated to be subject to this paragraph.

6.1.11To the extent that the Credit Supporter makes a payment to a Holder of the Trust Notes - Series 2019-A, the Credit Supporter shall be subrogated to all of the Holder’s rights and entitlements under the applicable Trust Notes - Series 2019-A, which shall remain outstanding.

6.2Consolidation, amalgamation, merger, conveyance, transfer or lease

The Credit Supporter shall not merge, amalgamate, consolidate or otherwise combine with any other Person or convey, transfer or lease all or substantially all of its assets to any Person, unless:

6.2.1in case the Credit Supporter shall consolidate or amalgamate with or merge into another Person or convey, transfer or lease all or substantially all of its assets to any Person, the Person formed by, or resulting from, such consolidation or amalgamation or into which the Credit Supporter, as the case may be, is merged or the Person that acquires by conveyance or transfer, or which leases, all or substantially all of the assets of the Credit Supporter (the “Successor Entity”) shall be the Credit Supporter or a corporation, partnership or trust, organized and validly existing and shall expressly assume and be legally responsible for the Guarantee and to perform all obligations of the Credit Supporter under this supplemental indenture, by supplemental indenture satisfactory to the Trustee executed and delivered to the Trustee by such Person;

6.2.2immediately after such consolidation, amalgamation, merger, conveyance, transfer or lease the Successor Entity must not be in default in the performance of the covenants and conditions of this supplemental indenture to be performed by the Credit Supporter;

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6.2.3if the Successor Entity is organized under the laws of a jurisdiction other than the laws of Canada or any province of territory thereof or the United States, any state thereof or the District of Columbia, such Successor Entity shall assume the Credit Supporter’s obligations under this supplemental indenture to pay Additional Amounts, with the name of such successor jurisdiction being included in addition to Canada in each place that Canada appears in Section 2.7 hereof; and

6.2.4the Credit Supporter has delivered to the Trustee an officers’ certificate and an opinion of Counsel, each stating that such consolidation, amalgamation, merger, conveyance, transfer or lease and, if a supplemental indenture is required in connection with such transaction, such supplemental indenture comply with this Article and that all conditions precedent herein provided for relating to such transaction have been complied with.

6.3Successor Substituted

Upon any consolidation or amalgamation of the Credit Supporter with, or merger of the Credit Supporter into, any other Person or any conveyance, transfer or lease of all or substantially all of the assets of the Credit Supporter in accordance with section 6.2, the Successor Entity shall succeed to, and be substituted for, and may exercise every right and power of the Credit Supporter under this supplemental indenture with the same effect as if such Successor Entity had been named as the Credit Supporter herein, and thereafter, except in the case of a lease, the predecessor Person shall be relieved of all obligations and covenants under this supplemental indenture and the Guarantee.

6.4Notice to the Credit Supporter

Any notice to the Credit Supporter under the provisions of this supplemental indenture shall be valid and effective if delivered personally to, by facsimile or, if given by first class mail, postage prepaid, addressed to, the Credit Supporter at 450 - 1st Street SW, Calgary, Alberta T2P 5H1, Attention: Corporate Secretary, facsimile: (403) 920-2467, and shall be deemed to have been given on the date of delivery, the Business Day immediately following the date such notice has been sent by facsimile or on the third Business Day after such letter has been mailed, as the case may be. The Credit Supporter may from time to time notify the Trustee of a change in address, which thereafter, until changed by a further notice, shall be the address of the Credit Supporter for all purposes of this Indenture.

6.5Reports by the Credit Supporter

Subject to the terms of a decision dated January 3, 2019 by the Alberta Securities Commission (as principal regulator) and the Ontario Securities Commission pursuant to National Policy 11-203 Process for Exemptive Relief Applications in Multiple Jurisdictions, the Credit Supporter covenants:

6.5.1to file with the Trustee, within 15 days after the Credit Supporter is required to file the same with the U.S. Securities and Exchange Commission (the “Commission”), copies of the annual reports and of the information, documents, and other reports (or copies of such portions of any of the foregoing as the Commission may from time to time by rules and regulations prescribe) which the Credit Supporter may be required to file with the Commission pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934; or if the Credit Supporter is not required to file information, documents, or reports pursuant to either of such Sections, then to file with the Trustee and the Commission, in accordance with rules and regulations prescribed from time to time by the Commission, such of the supplementary and periodic information, documents, and reports which may be required pursuant to Section 13 of the Securities Exchange Act of 1934

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in respect of a debt security listed and registered on a national securities exchange as may be prescribed from time to time in such rules and regulations;

6.5.2to file with the Trustee and the Commission, in accordance with rules and regulations prescribed from time to time by the Commission, such additional information, documents, and reports with respect to compliance by the Credit Supporter with the conditions and covenants provided for in the Original Indenture and this supplemental indenture as may be required from time to time by such rules and regulations; and

6.5.3to transmit by mail to the Holders of the Trust Notes- Series 2019 -A, in the manner and to the extent provided in Section 313(c) of the Trust Indenture Act of 1939, such summaries of any information, documents and reports required to be filed by the Credit Supporter pursuant to subsections 6.5.1 and 6.5.2 of this Section as may be required to be transmitted to such Holders by rules and regulations prescribed from time to time by the Commission.

Delivery of such reports, information and documents to the Trustee is for informational purposes only and the Trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Credit Supporter’s compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on certificates of officers of the Credit Supporter) and the filing of such reports, information and documents by or at the direction of the Credit Supporter on the Electronic Data Gathering, Analysis, and Retrieval system of the Commission (or any successor system) shall be deemed to constitute filing with the Trustee for the purposes of this Section 6.5.

ARTICLE 7

SUBORDINATION OF GUARANTEE

7.1Guarantee Subordinated to Guarantor Senior Indebtedness

7.1.1The Credit Supporter covenants and agrees, and each Holder of Trust Notes - Series 2019-A, by the acceptance thereof, likewise covenants and agrees, that the Guarantee by the Credit Supporter is hereby expressly subordinated, to the extent and in the manner hereinafter set forth, in right of payment to the prior payment in full of Guarantor Senior Indebtedness.

7.1.2In the event (a) of any insolvency or bankruptcy proceedings or any receivership, liquidation, reorganization or other similar proceedings in respect of the Credit Supporter or a substantial part of its property, or of any proceedings for liquidation, dissolution or other winding up of the Credit Supporter, whether or not involving insolvency or bankruptcy, or (b) subject to the provisions of Section 7.2 that (i) a default shall have occurred with respect to the payment of principal of or interest on or other monetary amounts due and payable on any Guarantor Senior Indebtedness, or (ii) there shall have occurred an event of default (other than a default in the payment of principal or interest or other monetary amounts due and payable) in respect of any Guarantor Senior Indebtedness, as defined therein or in the instrument under which the same is outstanding, permitting the holder or holders thereof to accelerate the maturity thereof (with notice or lapse of time, or both), and such event of default shall have continued beyond the period of grace, if any, in respect thereof, and, in the cases of subclauses (i) and (ii) of this clause (b), such default or event of default shall not have been cured or waived or shall not have ceased to exist, or (c) that the principal of and accrued interest on the Trust Notes - Series 2019-A shall have been declared due and payable and such declaration shall not have been rescinded and annulled, then:

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7.1.2.1the holders of all Guarantor Senior Indebtedness shall first be entitled to receive payment of the full amount due thereon, or provision shall be made for such payment in money or money’s worth, before the Holders of any of the Trust Notes - Series 2019-A are entitled to receive a payment from the Credit Supporter under the Guarantee;

7.1.2.2any payment by, or distribution of assets of, the Credit Supporter of any kind or character, whether in cash, property or securities, to which the Holders of any of the Trust Notes - Series 2019-A or the Trustee would be entitled except for the provisions of this Article shall be paid or delivered by the person making such payment or distribution, whether a trustee in bankruptcy, a receiver, receiver and manager or liquidating trustee or otherwise, directly to the holders of such Guarantor Senior Indebtedness or their representative or representatives or to the trustee or trustees under any indenture under which any instruments evidencing any of such Guarantor Senior Indebtedness may have been issued, ratably according to the aggregate amounts remaining unpaid on account of such Guarantor Senior Indebtedness held or represented by each, to the extent necessary to make payment in full of all Guarantor Senior Indebtedness remaining unpaid after giving effect to any concurrent payment or distribution (or provision therefor) to the holders of such Guarantor Senior Indebtedness, before any payment or distribution is made to the holders of the Trust Notes - Series 2019-A or to the Trustee under the Guarantee; and

7.1.2.3in the event that, notwithstanding the foregoing, any payment by, or distribution of assets of, the Credit Supporter of any kind or character, whether in cash, property or securities, in respect of the Guarantee, shall be received by the Trustee or the Holders of any of the Trust Notes - Series 2019-A before all Guarantor Senior Indebtedness is paid in full, or provision made for such payment in money or money’s worth, such payment or distribution in respect of the Guarantee shall be paid over to the holders of such Guarantor Senior Indebtedness or their representative or representatives or to the trustee or trustees under any indenture under which any instruments evidencing any such Guarantor Senior Indebtedness may have been issued, ratably as aforesaid, for application to the payment of all Guarantor Senior Indebtedness remaining unpaid until all such Guarantor Senior Indebtedness shall have been paid in full, after giving effect to any concurrent payment or distribution (or provision therefor) to the holders of such Guarantor Senior Indebtedness.

7.2Disputes with Holders of Certain Guarantor Senior Indebtedness

Any failure by the Credit Supporter to make any payment on or perform any other obligation under Guarantor Senior Indebtedness, other than any indebtedness incurred by the Credit Supporter or assumed or guaranteed, directly or indirectly, by the Credit Supporter for money borrowed (or any deferral, renewal, extension or refunding thereof) or any indebtedness or obligation as to which the provisions of this Section shall have been waived by the Credit Supporter in the instrument or instruments by which the Credit Supporter incurred, assumed, guaranteed or otherwise created such indebtedness or obligation, shall not be deemed a default or event of default under Section 7.1.2(b) if (a) the Credit Supporter shall be disputing its obligation to make such payment or perform such obligation and (b) either (i) no final judgment relating to such dispute shall have been issued against the Credit Supporter which is in full force and effect and is not subject to further review, including a judgment that has become final by reason of the expiration of the time within which a party may seek further appeal or review, and (ii) in the event of a judgment that is subject to further review or appeal has been issued, the Credit Supporter shall in good faith be prosecuting an appeal or other proceeding for review and a stay of execution shall have been obtained pending such appeal or review.

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7.3Subrogation

Subject to the payment in full of all Guarantor Senior Indebtedness, the Holders shall be subrogated (equally and ratably with the holders of all obligations of the Credit Supporter which by their express terms are subordinated to Guarantor Senior Indebtedness of the Credit Supporter to the same extent as the Guarantee is subordinated and which are entitled to like rights of subrogation) to the rights of the holders of Guarantor Senior Indebtedness to receive payments or distributions of cash, property or securities of the Credit Supporter applicable to the Guarantor Senior Indebtedness until all amounts owing on the Guarantee shall be paid in full, and as between the Credit Supporter, its creditors other than holders of such Guarantor Senior Indebtedness and the Holders, no such payment or distribution made to the holders of Guarantor Senior Indebtedness by virtue of this Article that otherwise would have been made to the Holders shall be deemed to be a payment by the Credit Supporter on account of such Guarantor Senior Indebtedness, it being understood that the provisions of this Article are and are intended solely for the purpose of defining the relative rights of the Holders, on the one hand, and the holders of Guarantor Senior Indebtedness, on the other hand.

7.4Obligation of Credit Supporter Unconditional

7.4.1Nothing contained in this Article or elsewhere in this supplemental indenture or in the Guarantee is intended to or shall impair, as among the Credit Supporter, its creditors other than the holders of Guarantor Senior Indebtedness and the Holders, the obligation of the Credit Supporter, which is absolute and unconditional, to pay to the Holders the amounts payable under the Guarantee as and when the same shall become due and payable in accordance with its terms, or is intended to or shall affect the relative rights of the Holders and creditors of the Credit Supporter other than the holders of Guarantor Senior Indebtedness, nor shall anything herein or therein prevent the Trustee or any Holder from exercising all remedies otherwise permitted by applicable law under the Guarantee, subject to the rights, if any, under this Article of the holders of Guarantor Senior Indebtedness in respect of cash, property or securities of the Credit Supporter received upon the exercise of any such remedy.

7.4.2Upon payment or distribution of assets of the Credit Supporter referred to in this Article, the Trustee and the Holders shall be entitled to rely upon any order or decree made by any court of competent jurisdiction in which any such dissolution, winding up, liquidation or reorganization proceeding affecting the affairs of the Credit Supporter is pending or upon a certificate of the trustee in bankruptcy, receiver, receiver and manager, assignee for the benefit of creditors, liquidating trustee or agent or other person making any payment or distribution, delivered to the Trustee or to the Holders, for the purpose of ascertaining the persons entitled to participate in such payment or distribution, the holders of the Guarantor Senior Indebtedness and other indebtedness of the Credit Supporter, the amount thereof or payable thereon, the amount paid or distributed thereon and all other facts pertinent thereto or to this Article.

7.5Payments on Guarantee Permitted

Nothing contained in this Article or elsewhere in this supplemental indenture or in the Guarantee shall affect the obligations of the Credit Supporter to make, or prevent the Credit Supporter from making, payment of amounts owing under the Guarantee in accordance with the provisions hereof and thereof, except as otherwise provided in this Article.

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7.6Effectuation of Subordination by Trustee

Each Holder of Trust Notes - Series 2019-A, by his acceptance thereof, authorizes and directs the Trustee on his behalf to take such action as may be necessary or appropriate to effectuate the subordination provided in this Article and appoints the Trustee his attorney-in-fact for any and all such purposes.

7.7Knowledge of Trustee

Notwithstanding the provisions of this Article or any other provisions of this supplemental indenture, the Trustee shall not be charged with knowledge of the existence of any facts that would prohibit the making of any payment of moneys under the Guarantee to or by the Trustee, or the taking of any other action by the Trustee, unless and until the Trustee shall have received written notice thereof mailed or delivered to the Trustee from the Credit Supporter, any Holder, any paying agent or the holder or representative of any class of Guarantor Senior Indebtedness; provided that if at least three Business Days prior to the date upon which by the terms hereof any such moneys may become payable for any purpose the Trustee shall not have received with respect to such moneys the notice provided for in this Section, then, anything herein contained to the contrary notwithstanding, the Trustee shall have full power and authority to receive such moneys and to apply the same to the purpose for which they were received and shall not be affected by any notice to the contrary that may be received by it within three Business Days prior to or on or after such date.

7.8Trustee May Hold Guarantor Senior Indebtedness

The Trustee shall be entitled to all the rights set forth in this Article with respect to any Guarantor Senior Indebtedness at the time held by it, to the same extent as any other holder of Guarantor Senior Indebtedness, and nothing in this supplemental indenture shall deprive the Trustee of any of its rights as such holder.

7.9Rights of Holders of Guarantor Senior Indebtedness Not Impaired

7.9.1No right of any present or future holder of any Guarantor Senior Indebtedness to enforce the subordination herein shall at any time or in any way be prejudiced or impaired by any act or failure to act on the part of the Credit Supporter or by any noncompliance by the Credit Supporter with the terms, provisions and covenants of this supplemental indenture, regardless of any knowledge thereof any such holder may have or be otherwise charged with.

7.9.2With respect to the holders of Guarantor Senior Indebtedness, (i) the duties and obligations of the Trustee shall be determined solely by the express provisions of this supplemental indenture, (ii) the Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this supplemental indenture, (iii) no implied covenants or obligations shall be read into this supplemental indenture against the Trustee and (iv) the Trustee shall not be deemed to be a fiduciary as to such holders.

7.10Article Applicable to Paying Agents

In case at any time any paying agent other than the Trustee shall have been appointed by the Issuer and be then acting hereunder, the term “Trustee” as used in this Article shall in such case (unless the context shall require not otherwise) be construed as extending to and including such paying agent within its meaning as fully for all intents and purposes as if such paying agent were named in this Article in addition to or in place of the Trustee; provided, however, that Sections 7.7 and 7.8 shall not apply to the Issuer if it acts as its own paying agent.

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ARTICLE 8

INDENTURE SUPPLEMENTAL TO ORIGINAL INDENTURE

8.1Indenture Supplemental to Original Indenture

This supplemental indenture is supplemental to the Original Indenture within the meaning of the Original Indenture and the Original Indenture, all indentures supplemental thereto and this supplemental indenture shall, subject to Section 1.9 of the Original Indenture, be read together and have the effect so far as practicable as though all the provisions thereof and hereof were contained in one instrument.

ARTICLE 9

ACCEPTANCE OF TRUSTS BY TRUSTEE

9.1Acceptance of Trusts by Trustee

The Trustee hereby accepts the trusts and duties declared and provided for in, and as otherwise contemplated by, this supplemental indenture and hereby agrees to perform the same upon the terms and conditions set forth herein and as contemplated hereby and in the Original Indenture, in each case as supplemented or amended from time to time.

ARTICLE 10

MISCELLANEOUS

10.1Counterparts

This supplemental indenture may be executed in several counterparts, including by facsimile or in electronic form, each of which when so executed shall be deemed to be an original, and such counterparts together shall constitute one and the same instrument and notwithstanding their date of execution shall be deemed to bear the same date as of the date hereof.

10.2Language of Indenture

The parties hereto have requested that this document, including the Schedules, be drafted in the English language.

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IN WITNESS WHEREOF the parties hereto have executed this supplemental indenture under the hands of their proper officers duly authorized in that behalf.

TRANSCANADA TRUST, by its Administrative Agent, TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
Name:	Joel E. Hunter
Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
Name:	Christine R. Johnston
Title:	Vice-President, Law and Corporate Secretary
TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
Name:	Joel E. Hunter
Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
Name:	Christine R. Johnston
Title:	Vice-President, Law and Corporate Secretary
AST TRUST COMPANY (CANADA)
By:	/s/ Nelia Andrade
Name:	Nelia Andrade
Title:	Authorized Signatory
By:	/s/ Marta Recinos
Name:	Marta Recinos
Title:	Authorized Signatory

SCHEDULE 2.3

FORM OF REGISTERED TRUST NOTE — SERIES 2019-A

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO TRANSCANADA TRUST (THE “ISSUER”) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN RESPECT THEREOF IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. EACH PURCHASER AND SUBSEQUENT TRANSFEREE OF THIS TRUST NOTE OR ANY INTEREST HEREIN WILL BE DEEMED TO HAVE REPRESENTED BY ITS PURCHASE, HOLDING, REDEMPTION OR EXCHANGE HEREOF THAT EITHER (I) IT IS NOT, AND IS NOT ACTING ON BEHALF OF (A) A PLAN THAT IS SUBJECT TO THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED (“ERISA”) OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”), OR AN ENTITY THAT IS DEEMED TO HOLD PLAN ASSETS OF THE FOREGOING (EACH, A “PLAN”), OR (B) A PLAN THAT IS SUBJECT TO FEDERAL, STATE OR OTHER LAWS (“SIMILAR LAWS”) THAT ARE SUBSTANTIALLY SIMILAR TO THE FIDUCIARY RESPONSIBILITY PROVISIONS OF ERISA OR THE PROHIBITED TRANSACTION PROVISIONS OF ERISA AND/OR SECTION 4975 OF THE CODE (“SIMILAR LAW PLANS”) OR (II) ITS PURCHASE, HOLDING, REDEMPTION OR EXCHANGE OF THIS TRUST NOTE OR ANY INTEREST HEREIN WILL NOT CONSTITUTE OR RESULT IN A NONEXEMPT PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE BECAUSE SUCH PURCHASER, TRANSFEREE AND SUBSEQUENT TRANSFEREE RELIED ON AN AVAILABLE PROHIBITED TRANSACTION EXEMPTION, ALL OF THE CONDITIONS OF WHICH ARE SATISFIED, OR IS NOT IN VIOLATION OF ANY APPLICABLE SIMILAR LAW.  EACH PURCHASER AND SUBSEQUENT TRANSFEREE OF THIS TRUST NOTE OR ANY INTEREST HEREIN WILL BE DEEMED TO HAVE ACKNOWLEDGED BY ITS PURCHASE, HOLDING, REDEMPTION OR EXCHANGE HEREOF THAT NEITHER PLANS NOR SIMILAR LAW PLANS MAY ACQUIRE THIS TRUST NOTE AT ANY TIME THAT THE RATINGS ON THIS TRUST NOTE ARE BELOW INVESTMENT GRADE OR THIS TRUST NOTE HAS BEEN CHARACTERIZED AS OTHER THAN INDEBTEDNESS FOR APPLICABLE LOCAL LAW PURPOSES.

No.                 

TRANSCANADA TRUST

(a trust established under the laws of Ontario)

Trust Notes — Series 2019-A Due September 15, 2079

CUSIP: 89356BAE8
ISIN: US89356BAE83

TRANSCANADA TRUST (the “Issuer”) for value received hereby acknowledges itself indebted and promises to pay to the registered holder hereof (the “Holder”) on September 15, 2079 or on such earlier

date as the principal amount hereof may become due in accordance with the provisions of the Indenture hereinafter mentioned, the principal sum of

[·] DOLLARS

$[·]

in lawful money of the United States on presentation and surrender of this Trust Note - Series 2019-A (as defined below) at the principal office of the Trustee in the City of Calgary, Alberta or such other location as it may designate from time to time, and to pay interest on the principal amount hereof from and including the date hereof, or from and including the last Interest Payment Date (as defined in the Indenture) to which interest shall have been paid or made available for payment on the outstanding Trust Notes - Series 2019-A, whichever is later, at the rate of 5.50% per annum, in like money at any one of the said places, in arrears in equal semi-annual payments on March 15 and September 15 in each year (or the next following Business Day (as defined in the Indenture) if such date is not a Business Day to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1 or September 1, respectively) from September 15, 2019 to, but excluding, September 15, 2029. Notwithstanding the foregoing, the initial interest payment payable on March 15, 2020, will be $27.96 per $1,000 principal amount of the Trust Notes - Series 2019-A.  Subject to any Benchmark Replacement Conforming Changes (as defined in the Indenture), from September 15, 2029 and on every Interest Reset Date (as defined in the Indenture) thereafter until September 15, 2079, the interest payable on the Trust Notes - Series 2019-A will be reset as follows: (i) at an interest rate per annum equal to the Benchmark (as defined in the Indenture) at the Reference Time (as defined in the Indenture) relating to such Interest Reset Date plus 4.154%, payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2029 and (ii) at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 4.904%, payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year to the persons in whose names the Trust Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2049. Subject to Article 5 of the supplemental indenture referred to below, interest as aforesaid shall be payable after as well as before default, with interest on overdue interest, in like money, at the same rates and on the same dates.

This Trust Note - Series 2019-A is one of the Trust Notes - Series 2019-A due September 15, 2079 (the “Trust Notes - Series 2019-A”) of the Issuer issued or issuable under the provisions of a trust indenture made as of May 20, 2015 between the Issuer and AST Trust Company (Canada), as trustee (the “Trustee”), as supplemented by a fifth supplemental indenture dated as of September 12, 2019 between the Issuer, the Trustee and TransCanada PipeLines Limited, as Credit Supporter (which trust indenture as so supplemented is herein referred to as the “Indenture”). The Trust Notes - Series 2019-A issuable under the Indenture are limited to an aggregate principal amount of up to $1,100,000,000, in lawful money of the United States. Reference is hereby expressly made to the Indenture for a description of the terms and conditions upon which the Trust Notes - Series 2019-A are or are to be issued and held and the rights, remedies and obligations of the holders of the Trust Notes - Series 2019-A, of the Issuer and of the Trustee in respect thereof, all to the same effect as if the provisions of the Indenture were herein set forth, to all of which provisions the Holder by acceptance hereof acknowledges and assents.

Subject to the occurrence of a Deferral Event, as interest on this Trust Note- Series 2019-A becomes due, the Issuer (except in the case of payment at maturity, at which time payment of interest may be made upon surrender of this Trust Note- Series 2019-A) shall on each date on which interest becomes due, forward or cause to be forwarded to the Holder, subject to the provisions of the Indenture, a related

2

Deferral Event Subscription Proceeds Assignment and a related Deferral Event Subscription, in the manner provided therein, a cheque by first class mail, postage prepaid or an electronic transfer of funds for such interest. Subject to the provisions of the Indenture, the forwarding of such cheque or effecting of such transfer shall satisfy and discharge all liability for interest on this Trust Note - Series 2019-A to the extent of the sum represented by such cheque or electronic transfer.

The Trust Notes - Series 2019-A are issuable only as fully registered Trust Notes - Series 2019-A in the denominations of $1,000 and integral multiples thereof. Upon compliance with the provisions of the Indenture, the Trust Notes - Series 2019-A of any denomination may be exchanged for an equal aggregate principal amount of the Trust Notes - Series 2019-A in any other authorized denomination or denominations.

The Trust Notes - Series 2019-A are direct obligations of the Issuer but are not secured by any mortgage, pledge, hypothec or other charge.

TransCanada PipeLines Limited has guaranteed the due and punctual payment of the principal amount of and interest on the Trust Notes — Series 2019-A on a subordinated basis in the manner and on the terms set forth in the Indenture.

The indebtedness evidenced by this Trust Note - Series 2019-A and by all other Trust Notes - Series 2019-A now or hereafter certified and delivered under the Indenture is subordinated and subject in right of payment, to the extent and in the manner provided in the Indenture, to the prior payment of all Guarantor Senior Indebtedness (as defined in the Indenture), whether outstanding at the date of the Indenture or thereafter created, incurred, assumed or guaranteed.

The right is reserved to the Issuer to purchase or redeem the Trust Notes - Series 2019-A for cancellation in accordance with the provisions of the Indenture.

The Trust Notes - Series 2019-A will be automatically exchanged for TCPL Exchange Preferred Shares in the event of an Automatic Exchange Event, in the manner, with the effect and as of the effective time contemplated in the Indenture and the Share Exchange Agreement.  The Indenture also provides for a mandatory subscription and purchase of TCPL Deferral Preferred Shares by Holders of Trust Notes - Series 2019-A upon the occurrence of a Deferral Event, by Holders assigning their entitlements to receive interest otherwise payable to them to TCPL in order to pay for such TCPL Deferral Preferred Shares (which interest entitlements are absolutely, irrevocably and unconditionally assigned to TCPL as consideration for such purchases), in each case in the manner, with effect and at the times contemplated in the Indenture and the Assignment and Set-Off Agreement.  Holders of the Trust Notes - Series 2019-A acknowledge and, by receipt hereof confirm and assent to, the appointments made, covenants and undertakings given and obligations created on their behalf pursuant to the Share Exchange Agreement and the Assignment and Set-Off Agreement.

The Indenture contains provisions making binding upon all Holders of the Trust Notes - Series 2019-A outstanding thereunder resolutions passed at meetings of Holders of the Trust Notes - Series 2019-A held in accordance with such provisions and instruments signed by the Holders of a specified majority of the Trust Notes - Series 2019-A.

This Trust Note - Series 2019-A may only be transferred, upon compliance with the conditions prescribed in the Indenture, in one of the registers to be kept at the principal office of the Trustee or other registrar in the City of Calgary, Alberta by the Holder or such Holder’s executors or administrators or other legal representatives or such Holder’s attorney duly appointed by an instrument in form and substance

3

satisfactory to the Trustee or other registrar, and upon compliance with such reasonable requirements as the Trustee and/or other registrar may prescribe.

This Trust Note - Series 2019-A shall be governed by and construed in accordance with the laws of the Province of Ontario and the laws of Canada applicable therein.

This Trust Note - Series 2019-A shall not become obligatory for any purpose until it shall have been certified by the Trustee under the Indenture.

IN WITNESS WHEREOF this Trust Note - Series 2019-A has been duly executed by the Issuer.

DATED as of                          , 2
	TRANSCANADA TRUST by its Administrative Agent TRANSCANADA PIPELINES LIMITED
	By:
	Name:
	Title:
	By:
	Name:
	Title:

4

(FORM OF TRUSTEE’S CERTIFICATE)

This Trust Note - Series 2019-A is one of the Trust Notes - Series 2019-A due March 15, 2079 referred to in the Indenture within mentioned.

AST TRUST COMPANY (CANADA), Trustee
By:
	(Authorized Signing Officer)

(FORM OF REGISTRATION PANEL)

(No writing hereon except by Trustee or other Registrar)

Date of Registration In Whose Name Registered Trustee or Registrar

(FORM OF CERTIFICATE OF TRANSFER)

CERTIFICATE OF TRANSFER

I or we assign and transfer this Trust Note - Series 2019-A to:

(Print or type assignee’s name, address and postal code)

and irrevocably appoint                           agent to transfer this Trust Note - Series 2019-A on the books of TransCanada Trust. The agent may substitute another to act for him.

Date:	Your Signature:
		(Sign exactly as your name appears on the Trust Notes - Series 2019-A)
	Signature Guarantee:
	(This signature must be guaranteed by Canadian Schedule I chartered bank or a member of the Securities Transfer Association Medallion Program (STAMP), a member of the Stock Exchange Medallion Program (SEMP) or a member of the New York Stock Exchange Inc. Medallion Signature Program (MSP)).

EX-5

Exhibit 5

TRANSCANADA PIPELINES LIMITED

as Issuer

and

COMPUTERSHARE TRUST COMPANY OF CANADA

as Trustee

FIFTH SUPPLEMENTAL INDENTURE

PROVIDING FOR THE ISSUE OF UP TO

$1,100,000,000  PRINCIPAL AMOUNT OF

TCPL SUB NOTES - SERIES 2019-A DUE SEPTEMBER 15, 2079

Dated as of September 12, 2019

Table of Contents

				Page
ARTICLE 1 INTERPRETATION				2
1.1	Definitions			2
1.2	Interpretation Not Affected By Headings, etc.			7
1.3	Incorporation of Certain Definitions			7
1.4	Definition of “this Indenture”			8
1.5	Currency References			8
1.6	Additional Provisions Relating to the TCPL Sub Notes — Series 2019-A			8
ARTICLE 2 THE TCPL SUB NOTES — SERIES 2019-A				8
2.1	Limitation on Issue and Designation			8
2.2	Terms of TCPL Sub Notes — Series 2019-A			8
2.3	Form of TCPL Sub Notes - Series 2019-A			9
2.4	Registrar and Transfer Agent, Paying Agent and Calculation Agent			10
2.5	Benchmark Determination			10
2.6	Rights of Set-Off			11
2.7	Additional Amounts			11
2.8	Transfer Restriction			12
ARTICLE 3 REDEMPTION AND PURCHASE FOR CANCELLATION OF THE TCPL SUB NOTES — SERIES 2019-A				12
3.1	Redemption of TCPL Sub Notes - Series 2019-A at the Option of the Issuer			12
3.2	Partial Redemption of TCPL Sub Notes - Series 2019-A			12
3.3	Early Redemption upon a Tax Event			13
3.4	Early Redemption upon Rating Event			13
3.5	Notice of Redemption			13
3.6	Purchase of the TCPL Sub Notes - Series 2019-A for Cancellation			13
3.7	Cancellation of the TCPL Sub Notes - Series 2019-A			14
ARTICLE 4 INDENTURE SUPPLEMENTAL TO ORIGINAL INDENTURE				14
4.1	Indenture Supplemental to Original Indenture			14
ARTICLE 5 ACCEPTANCE OF TRUSTS BY TRUSTEE				14
5.1	Acceptance of Trusts by Trustee			14
ARTICLE 6 MISCELLANEOUS				14
6.1	Counterparts			14
6.2	Language of Indenture			14
SCHEDULE
SCHEDULE 2.3		—	Form of Fully Registered TCPL Sub Notes - Series 2019-A

THIS FIFTH SUPPLEMENTAL INDENTURE dated as of September 12, 2019,

BETWEEN:

TRANSCANADA PIPELINES LIMITED, a corporation existing under the federal laws of Canada and having an office in the City of Calgary in the Province of Alberta

(hereinafter called the “Issuer” or “TCPL”)

OF THE FIRST PART

- and -

COMPUTERSHARE TRUST COMPANY OF CANADA, a trust company existing under the federal laws of Canada and having an office in the City of Calgary in the Province of Alberta

(hereinafter called the “Trustee”)

OF THE SECOND PART

WHEREAS by a trust indenture (the “Original Indenture”) dated as of May 20, 2015 between the Issuer and the Trustee, provision was made for the issue of subordinated notes of the Issuer without limitation as to the aggregate principal amount but issuable only subject to the provisions of the Original Indenture;

WHEREAS by a first supplemental indenture to the Original Indenture dated as of May 20, 2015, U.S.$750,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of TCPL Sub Notes designated as TCPL Sub Notes - Series 2015-A due May 20, 2075, were issued;

WHEREAS by a second supplemental indenture to the Original Indenture dated as of August 11, 2016, U.S.$1,200,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of TCPL Sub Notes designated as TCPL Sub Notes - Series 2016-A due August 15, 2076, were issued;

WHEREAS by a third supplemental indenture to the Original Indenture dated as of March 2, 2017, U.S.$1,500,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of TCPL Sub Notes designated as TCPL Sub Notes - Series 2017-A due March 15, 2077, were issued;

WHEREAS by a fourth supplemental indenture to the Original Indenture dated as of May 18, 2017, Cdn.$1,500,000,000 aggregate principal amount of subordinated notes of the Issuer, as a Series of TCPL Sub Notes designated as TCPL Sub Notes - Series 2017-B due May 18, 2077, were issued;

WHEREAS the Issuer is desirous of issuing subordinated notes under the provisions of the Original Indenture, and this supplemental indenture, as a Series of TCPL Sub Notes to be designated as TCPL Sub Notes - Series 2019-A due September 15, 2079 (the “TCPL Sub Notes - Series 2019-A”);

WHEREAS the Issuer and the Trustee have agreed to supplement the Original Indenture as herein provided;

WHEREAS all necessary action has been taken by the Issuer to make the TCPL Sub Notes - Series 2019-A, when certified by the Trustee and issued as provided in this supplemental indenture, valid, binding and legal obligations of the Issuer with the benefits and subject to the terms of the Original Indenture and to make this supplemental indenture a valid and binding agreement of the Issuer, in accordance with its terms; and

WHEREAS the foregoing recitals are made as representations and statements of fact by the Issuer and not by the Trustee.

NOW THEREFORE THIS INDENTURE WITNESSETH and it is hereby covenanted, agreed and declared as follows:

ARTICLE 1

INTERPRETATION

1.1Definitions

In this supplemental indenture, unless there is something in the subject matter or context inconsistent therewith:

“Additional Amounts” has the meaning ascribed to such term in Section 2.7.2;

“Benchmark” means initially, three-month LIBOR; provided that if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to three-month LIBOR or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement;

“Benchmark Replacement” means the Interpolated Benchmark with respect to the then-current Benchmark; provided that if the Trust or its designee cannot determine the Interpolated Benchmark as of the Benchmark Replacement Date, then “Benchmark Replacement” means the first alternative set forth in the order below that can be determined by the Trust or its designee as of the Benchmark Replacement Date:

(1)the sum of: (a) Term SOFR and (b) the Benchmark Replacement Adjustment;

(2)the sum of: (a) Compounded SOFR and (b) the Benchmark Replacement Adjustment;

(3)the sum of: (a) the alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then-current Benchmark for the applicable Corresponding Tenor and (b) the Benchmark Replacement Adjustment;

(4)the sum of: (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment;

(5)the sum of: (a) the alternate rate of interest that has been selected by the Trust or its designee as the replacement for the then-current Benchmark for the applicable Corresponding Tenor giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar denominated floating rate notes at such time and (b) the Benchmark Replacement Adjustment;

“Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by the Trust or its designee as of the Benchmark Replacement Date:

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(1)the spread adjustment, or method for calculating or determining such spread adjustment, (which may be a positive or negative value or zero) that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement;

(2)if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, then the ISDA Fallback Adjustment;

(3)the spread adjustment (which may be a positive or negative value or zero) that has been selected by the Trust or its designee giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar denominated floating rate notes at such time;

“Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definition of “Interest Period”, timing and frequency of determining rates and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the Trust decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if the Trust decides that adoption of any portion of such market practice is not administratively feasible or if the Trust determines that no market practice for use of the Benchmark Replacement exists, in such other manner as the Trust determines is reasonably necessary);

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark:

(1) in the case of clause (1) or (2) of the definition of “Benchmark Transition Event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark; or

(2) in the case of clause (3) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein.

For the avoidance of doubt, if the event giving rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination;

“Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark:

(1) a public statement or publication of information by or on behalf of the administrator of the Benchmark announcing that such administrator has ceased or will cease to provide the Benchmark, permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark;

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark, the central bank for the currency of the Benchmark, an insolvency official with jurisdiction over the administrator for the Benchmark, a resolution authority with jurisdiction over the administrator for the Benchmark or a court or an entity with similar insolvency

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or resolution authority over the administrator for the Benchmark, which states that the administrator of the Benchmark has ceased or will cease to provide the Benchmark permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark; or

(3) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative;

“Canadian Taxes” has the meaning ascribed to such term in Section 2.7.1;

“Closing Date” means September 12, 2019;

“Compounded SOFR” means the compounded average of SOFRs for the applicable Corresponding Tenor, with the rate, or methodology for this rate, and conventions for this rate (which will be compounded in arrears with a lookback and/or suspension period as a mechanism to determine the interest amount payable prior to the end of each Interest Period) being established by the Trust or its designee in accordance with:

(1) the rate, or methodology for this rate, and conventions for this rate selected or recommended by the Relevant Governmental Body for determining Compounded SOFR; provided that:

(2) if, and to the extent that, the Trust or its designee determines that Compounded SOFR cannot be determined in accordance with clause (1) above, then the rate, or methodology for this rate, and conventions for this rate that have been selected by the Trust or its designee giving due consideration to any industry-accepted market practice for U.S. dollar denominated floating rate notes at such time;

“Corresponding Tenor” with respect to a Benchmark Replacement means a tenor (including overnight) having approximately the same length (disregarding business day adjustment) as the applicable tenor for the then-current Benchmark;

“Excluded Holder” has the meaning ascribed to such term in Section 2.7.2;

“Federal Reserve Bank of New York’s Website” means the website of the Federal Reserve Bank of New York at http://www.newyorkfed.org, or any successor source.

“Fitch” means Fitch Ratings Inc.;

“Holders” means the registered holders, from time to time, of the TCPL Sub Notes - Series 2019-A or, where the context requires, all of such holders;

“Interest Payment Date” means, prior to and excluding September 15, 2029, March 15 and September 15 (other than September 15, 2019) and, starting September 15, 2029, March 15, June 15, September 15 and December 15 of each year during which any TCPL Sub Notes — Series 2019-A are outstanding thereafter, until September 15, 2079;

“Interest Period” means, initially, the period from and including the Closing Date to but excluding March 15, 2020 and thereafter from and including each Interest Payment Date to but excluding, the next following Interest Payment Date;

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“Interest Reset Date” means September 15, 2029 and every March 15, June 15, September 15 and December 15 of each year during which any TCPL Sub Notes - Series 2019-A are outstanding thereafter until September 15, 2079, on which dates the interest rate on the TCPL Sub Notes — Series 2019-A will be reset as described on the Form of Fully Registered TCPL Sub Notes - Series 2019-A attached as Schedule 2.3 hereto;

“Interpolated Benchmark” with respect to the Benchmark means the rate determined for the Corresponding Tenor by interpolating on a linear basis between: (1) the Benchmark for the longest period (for which the Benchmark is available) that is shorter than the Corresponding Tenor and (2) the Benchmark for the shortest period (for which the Benchmark is available) that is longer than the Corresponding Tenor;

“ISDA Definitions” means the 2006 ISDA Definitions published by the International Swaps and Derivatives Association, Inc. or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time;

“ISDA Fallback Adjustment” means the spread adjustment, (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor;

“ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment;

“LIBOR” means, for any Interest Period, the rate for U.S. dollar borrowings appearing on page LIBOR01 of the Reuters Service (or on any successor or substitute page of such Service, or any successor to or substitute for such Service providing rate quotations comparable to those currently provided on such page of such Service, as determined by the Trust from time to time for purposes of providing quotations of interest rates applicable to U.S. dollar deposits in the London interbank market) at approximately 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period, as the rate for U.S. Dollar deposits with a maturity comparable to such Interest Period.  In the event that such rate is not available at such time for any reason, then “LIBOR” for such Interest Period shall be the rate at which U.S. dollar deposits of $5,000,000 and for a maturity comparable to such Interest Period are offered by the principal London office of an agent selected by the Trust in immediately available funds in the London interbank market at approximately 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period. Notwithstanding the foregoing, if the Trust or its designee determine that a Benchmark Transition Event and related Benchmark Replacement Date have occurred with respect to three-month LIBOR, then the provisions of Section 2.5 of this Indenture with respect to a Benchmark Replacement shall govern;

“Maturity Date” means September 15, 2079;

“Moody’s” means Moody’s Investor Service, Inc.;

“Original Indenture” has the meaning ascribed to such term in the first recital to this supplemental indenture;

“Rating Event” means that the Trust or TCPL has received confirmation from S&P, Moody’s or Fitch that due to (i) any amendment to, clarification of, or change in hybrid capital methodology or

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a change in the interpretation thereof, in each case occurring or becoming effective after the date of issue of the Trust Notes — Series 2019-A; or (ii) the application of a different hybrid capital methodology or set of criteria by S&P, Moody’s or Fitch after the date of issue of the Trust Notes — Series 2019-A (due to any reason other than solely as a result of a decrease in the credit rating previously assigned to the Trust Notes — Series 2019-A, it being understood that for this purpose a “decrease in the credit rating previously assigned to the Trust Notes — Series 2019-A” means: (A) in the case of S&P, a rating below BBB; (B) in the case of Moody’s, a rating below Baa2; (C) in the case of Fitch, a rating below BBB; and (D) in the case of a designation by another rating agency, below an equivalent rating), the Trust Notes — Series 2019-A will no longer be eligible for the same or a higher amount of “equity credit” (or such other nomenclature that S&P, Moody’s or Fitch may then use to describe “equity credit”) attributed to the Trust Notes — Series 2019-A on the date of issue of the Trust Notes — Series 2019-A;

“Reference Time” means with respect to any determination of the Benchmark means (1) if the Benchmark is three-month LIBOR, 11:00 a.m. (London time) on the day that is two London banking days preceding the date of such determination, and (2) if the Benchmark is not three-month LIBOR, the time determined by the Trust or its designee in accordance with the Benchmark Replacement Conforming Changes;

“Relevant Governmental Body” means the Federal Reserve Board and/or the Federal Reserve Bank of New York, or a committee officially endorsed or convened by the Federal Reserve Board and/or the Federal Reserve Bank of New York or any successor thereto.

“S&P” means S&P Global Ratings, acting through Standard & Poor’s Ratings Services (Canada), a business unit of S&P Global Canada Corp.;

“SOFR” with respect to any day means the secured overnight financing rate published for such day by the Federal Reserve Bank of New York, as the administrator of the benchmark, (or a successor administrator) on the Federal Reserve Bank of New York’s Website;

“Tax Event” means the Trust, TCE or TCPL has received an opinion of independent counsel of a nationally recognized law firm in Canada or the United States experienced in such matters (who may be counsel to the Trust, TCE or TCPL) to the effect that, as a result of, (i) any amendment to, clarification of, or change (including any announced prospective change) in, the laws, or any regulations thereunder, or any application or interpretation thereof, of Canada or the United States or any political subdivision or taxing authority thereof or therein, affecting taxation; (ii) any judicial decision, administrative pronouncement, published or private ruling, regulatory procedure, rule, notice, announcement, assessment or reassessment (including any notice or announcement of intent to adopt or issue such decision, pronouncement, ruling, procedure, rule, notice, announcement, assessment or reassessment) (collectively, an “administrative action”); or (iii) any amendment to, clarification of, or change in, the official position with respect to or the interpretation of any administrative action or any interpretation or pronouncement that provides for a position with respect to such administrative action that differs from the theretofore generally accepted position, in each of case (i), (ii) or (iii), by any legislative body, court, governmental authority or agency, regulatory body or taxing authority, irrespective of the manner in which such amendment, clarification, change, administrative action, interpretation or pronouncement is made known, which amendment, clarification, change or administrative action is effective or which interpretation, pronouncement or administrative action is announced on or after the date of issue of the Trust Notes - Series 2019-A, there is more than an insubstantial risk (assuming any proposed or announced amendment, clarification, change, interpretation, pronouncement or administrative action is effective and applicable) that (A) the Trust, TCE or TCPL is, or may be, subject to more

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than a de minimus amount of additional taxes, duties or other governmental charges or civil liabilities because the treatment of any of its items of income, taxable income, expense, taxable capital or taxable paid-up capital with respect to the Trust Notes - Series 2019-A (including the treatment by the Trust, TCE or TCPL of interest on the TCPL Sub Notes - Series 2019-A or the Trust Notes - Series 2019-A) or the treatment of the TCPL Sub Notes - Series 2019-A or other property of the Trust, as or as would be reflected in any tax return or form filed, to be filed, or otherwise could have been filed, will not be respected by a taxing authority, (B) the Trust is, or will be, subject to more than a de minimus amount of taxes, duties or other governmental charges or civil liabilities, or (C) any payment of interest, consideration or otherwise in respect of the TCPL Sub Notes - Series 2019-A or the Trust Notes - Series 2019-A gives rise to more than a de minimus amount of withholding tax for the Trust, TCE or TCPL and/or that results in the requirement to pay more than a de minimus amount of Additional Amounts under Section 2.7;

“TCE” means TC Energy Corporation and includes its successors and assigns;

“TCPL” means TransCanada PipeLines Limited and includes its successors and assigns;

“TCPL Sub Notes - Series 2019-A” means the up to $1,100,000,000 principal amount of TCPL Sub Notes - Series 2019-A due September 15, 2079 issued by the Issuer hereunder;

“Term SOFR” means the forward-looking term rate for the applicable Corresponding Tenor based on SOFR that has been selected or recommended by the Relevant Governmental Body;

“this supplemental indenture”, “hereto”, “hereby”, “hereunder”, “hereof”, “herein” and similar expressions refer to this supplemental indenture and not to any particular article, section, subdivision or other portion hereof, and include any and every supplemental indenture;

“Trust” means TransCanada Trust, a trust established under the laws of Ontario, and includes its successors and assigns;

“Trust Notes - Series 2019-A” means the up to $1,100,000,000 principal amount of Trust Notes - Series 2019-A due September 15, 2079 issued by the Trust; and

“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment.

Words importing the singular include the plural and vice versa and words importing the masculine gender include the feminine gender and vice versa.

1.2Interpretation Not Affected By Headings, etc.

The division of this supplemental indenture into Articles and Sections, the provision of a table of contents and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this supplemental indenture.

1.3Incorporation of Certain Definitions

All terms contained in this supplemental indenture which are defined in the Original Indenture, as supplemented and amended to the date hereof, shall, for all purposes hereof, have the meanings given to

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such terms in the Original Indenture, as so supplemented and amended, unless otherwise defined herein or unless the context otherwise specifies or requires.

1.4Definition of “this Indenture”

The term “this Indenture”, whenever used herein, means the Original Indenture as supplemented and amended by this supplemental indenture.

1.5Currency References

All references to dollar ($) amounts shall, unless otherwise expressly indicated herein, be to United States dollars.

1.6Additional Provisions Relating to the TCPL Sub Notes — Series 2019-A.

For the purposes of this supplemental indenture, and the TCPL Sub Notes — Series 2019-A:

“Business Day” means a day on which TCPL, the Trust, and the Trustee are open for business in the City of Calgary, Alberta, other than a Saturday, Sunday or any statutory or civic holiday in the City of Toronto, Ontario, the City of Calgary, Alberta or the City of New York, New York.

ARTICLE 2

THE TCPL SUB NOTES — SERIES 2019-A

2.1Limitation on Issue and Designation

The aggregate principal amount of the TCPL Sub Notes - Series 2019-A that may be issued and certified hereunder shall be limited to up to $1,100,000,000 principal amount of the TCPL Sub Notes designated as “TCPL Sub Notes - Series 2019-A due September 15, 2079”.

2.2Terms of TCPL Sub Notes — Series 2019-A

2.2.1The TCPL Sub Notes - Series 2019-A shall be dated as of the Closing Date, regardless of their actual date of issue, and shall mature on the Maturity Date.

2.2.2Subject to Section 2.2.5 below, from the Closing Date to, but excluding, September 15, 2029, the TCPL Sub Notes - Series 2019-A will bear interest at the rate of 5.75% per annum, payable in arrears in equal semi-annual payments on each Interest Payment Date to the persons in whose names the TCPL Sub Notes - Series 2019-A are registered at the close of business on the preceding March 1 or September 1, respectively, with the first payment on March 15, 2020.  Notwithstanding the foregoing, the initial interest payment payable on March 15, 2020, will be $29.23 per $1,000 principal amount of the TCPL Sub Notes - Series 2019-A.  Subject to any Benchmark Replacement Conforming Changes, from September 15, 2029 and on every Interest Reset Date thereafter until September 15, 2079, the interest rate on the TCPL Sub Notes - Series 2019-A will be reset as follows: (i) at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 4.404%, payable in arrears on each Interest Payment Date to the persons in whose names the TCPL Sub Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2029 and (ii) at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 5.154%,

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payable in arrears on each Interest Payment Date to the persons in whose names the TCPL Sub Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such rate being on December 15, 2049. Interest as aforesaid shall be payable after as well as before default, with interest on overdue interest, in like money, at the same rates and on the same dates.

2.2.3Interest for each Interest Period from the Closing Date to, but excluding, September 15, 2029, will be calculated on the basis of a 360-day year consisting of twelve 30-day months. Subject to any Benchmark Replacement Conforming Changes, interest for each Interest Period from September 15, 2029 to the Maturity Date will be calculated on the basis of the actual number of days elapsed during each such Interest Period and a 360-day year. For the purposes of disclosure under the Interest Act (Canada), and without affecting the interest payable on the TCPL Sub Notes - Series 2019-A, whenever the interest rate on the TCPL Sub Notes - Series 2019-A is to be calculated on the basis of a period of less than a calendar year, the yearly interest rate equivalent for such interest rate will be the interest rate multiplied by the actual number of days in the relevant calendar year and divided by the number of days used in calculating the specified interest rate.

2.2.4If any Interest Payment Date would otherwise fall on a day which is not a Business Day, payment shall be postponed until the next Business Day, and no further interest or other sums will accrue in respect of such postponement.

2.2.5After the Closing Date, subject to the limit in Section 2.1, the Issuer shall be entitled to issue additional TCPL Sub Notes - Series 2019-A (“Additional TCPL Sub Notes - Series 2019-A”), which shall have identical terms as the TCPL Sub Notes - Series 2019-A issued on the Closing Date, other than with respect to their issue date, issue price and, if applicable, their first interest payment date and interest accrual date.

2.2.6With respect to any Additional TCPL Sub Notes - Series 2019-A, the Issuer shall set forth in an Officer’s Certificate, which shall be delivered to the Trustee, the following information:

2.2.6.1the aggregate principal amount of such Additional TCPL Sub Notes - Series 2019-A to be authenticated and delivered pursuant to this Indenture;

2.2.6.2the issue price and the issue of such Additional TCPL Sub Notes - Series 2019-A; and

2.2.6.3if applicable, the first interest payment date and interest accrual date of such Additional TCPL Sub Notes - Series 2019-A.

2.3Form of TCPL Sub Notes - Series 2019-A

2.3.1The TCPL Sub Notes - Series 2019-A shall be issued only as fully registered TCPL Sub Notes - Series 2019-A in denominations of $1,000 and integral multiples thereof and shall not, unless otherwise determined by the Issuer, be registered in the name of or held by or through any Clearing Agency.

2.3.2The TCPL Sub Notes - Series 2019-A and the certificate of the Trustee endorsed thereon shall be in the English language (and may be in the French language) and shall be substantially in the form set out in Schedule 2.3 hereto, with such appropriate additions, deletions,

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substitutions and variations as the Trustee may approve (or as may be required to issue Additional Trust Notes-Series 2019-A pursuant to Section 2.2.5) and shall bear such distinguishing letters and numbers as the Trustee may approve, such approval of the Trustee to be conclusively evidenced by its certification of the TCPL Sub Notes - Series 2019-A. In the event that any provision of the TCPL Sub Notes - Series 2019-A in the French language, if any, shall be susceptible to an interpretation different from the equivalent provision in the English language, the interpretation of such provision in the English language shall be determinative.

2.3.3The TCPL Sub Notes - Series 2019-A may be engraved, printed or lithographed, or partly in one form and partly in another, as the Issuer may determine.

2.4Registrar and Transfer Agent, Paying Agent and Calculation Agent

2.4.1The Issuer hereby appoints the Trustee as the registrar and transfer agent of the TCPL Sub Notes - Series 2019-A and the Trustee hereby accepts such appointment.

2.4.2The Issuer confirms that the Issuer will itself act as Paying Agent in respect of the TCPL Sub Notes - Series 2019-A and as the calculation agent to determine the amount of floating rate interest payable on the TCPL Sub Notes - Series 2019-A from and after September 15, 2029. All determinations of the Benchmark by the Trust or its designee, in the absence of manifest error, will be conclusive and binding on the Holders.

2.5Benchmark Determination

2.5.1Prior to the occurrence of a Benchmark Transition Event and related Benchmark Replacement Date with respect to three month LIBOR, the Benchmark will be LIBOR. If the Trust or its designee determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred prior to the Reference Time in respect of any determination of the Benchmark on any date, the Benchmark Replacement will replace the then-current Benchmark for all purposes relating to the TCPL Sub-Notes — Series 2019-A in respect of such determination on such date and all determinations on all subsequent dates.

2.5.2In connection with the implementation of a Benchmark Replacement, the Trust or its designee will have the right to make Benchmark Replacement Conforming Changes from time to time.

2.5.3Any determination, decision or election that may be made by the Trust or its designee pursuant to this Section 2.5 including any determination with respect to a tenor, rate or adjustment or of the occurrence or non-occurrence of an event, circumstance or date and any decision to take or refrain from taking any action or any selection, will be conclusive and binding absent manifest error, may be made in the Trust’s or its designee’s sole discretion, and, notwithstanding anything to the contrary herein or in any other documentation relating to the TCPL Sub Notes — Series 2019-A, shall become effective without consent from the holders of the TCPL Sub Notes — Series 2019-A or any other party.

2.5.4The Issuer shall from time to time immediately after the occurrence of any Benchmark Transition Event which requires a Benchmark Replacement as provided in this Section 2.5, deliver a certificate of the Issuer to the Trustee specifying the nature of the event requiring the same and the new rate, and setting forth the method of calculation and the facts upon which such calculation is based. The Trustee shall rely upon the certificate of the Issuer pursuant to this Section 2.5 for all purposes.

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2.6Rights of Set-Off

Notwithstanding Section 4.8 of the Original Indenture, each party may set-off against amounts owing by it hereunder to another Person any amounts owing or accruing due by such Person to it or any of its Affiliates, without duplication.

2.7Additional Amounts

2.7.1All payments made by or on account of any obligation of the Issuer under or with respect to the TCPL Sub Notes - Series 2019-A shall be made free and clear of and without withholding or deduction for, or on account of, any present or future tax, duty, levy, impost, assessment or other governmental charge (including penalties, interest and other liabilities related thereto) imposed or levied by or on behalf of the Government of Canada or any province or territory thereof or by any authority or agency therein or thereof having power to tax (hereinafter, “Canadian Taxes”), or, in the event that a Successor Entity that is organized under the laws of a jurisdiction other than the laws of Canada or any province of territory thereof is substituted for the Issuer pursuant to Article 8 of the Original Indenture, by or on behalf of the government of such successor jurisdiction or any subdivision thereof or by any authority or agency therein or thereof having power to tax.

2.7.2For so long as the Trust is the holder of TCPL Sub Notes — Series 2019-A, if the Trust is required to withhold or deduct any amount for or on account of Canadian Taxes from any payment made under or with respect to the Trust Notes - Series 2019-A, the Issuer shall pay as additional interest such additional amounts (“Additional Amounts”) as may be necessary so that the Trust may provide a net amount to each holder of Trust Notes — Series 2019-A (including Additional Amounts) after such withholding or deduction shall not be less than the amount such holder of Trust Notes — Series 2019-A would have received if such Canadian Taxes had not been withheld or deducted; provided, however, that no Additional Amounts shall be payable to the Trust with respect to a payment made to a holder of Trust Notes — Series 2019-A (an “Excluded Holder”) in respect of a beneficial owner of Trust Notes Series 2019-A (i) with which the Trust does not deal at arm’s length (for purposes of the Income Tax Act (Canada)) at the time the amount is paid or payable, (ii) where the payment is in respect of a debt or other obligation to pay an amount to a person with whom the payor is not dealing at arm’s length for the purposes of the Income Tax Act (Canada), (iii) which is subject to such Canadian Taxes by reason of the failure of such holder of Trust Notes — Series 2019-A to comply with any certification, identification, information, documentation or other reporting requirement if compliance is required by law, regulation, administrative practice or an applicable treaty as a precondition to exemption from, or a reduction in, the rate of deduction or withholding of, such Canadian Taxes, (iv) where all or any portion of the amount paid to such holder of Trust Notes — Series 2019-A is deemed to be a dividend paid to such holder of Trust Notes — Series 2019-A pursuant to subsection 214(16) of the Income Tax Act (Canada), or (v) which is subject to such Canadian Taxes by reason of its carrying on business in or being connected with Canada or any province or territory thereof otherwise than by the mere holding of Trust Notes — Series 2019-A or the receipt of payments thereunder. The Trust shall make such withholding or deduction and remit the full amount deducted or withheld to the relevant authority as and when required under applicable law.

2.7.3If a holder of Trust Notes — Series 2019-A has received a refund or credit for any Canadian Taxes with respect to which the Issuer has paid Additional Amounts pursuant to this Section 2.7, and such holder has paid over such refund to the Trust, the Trust shall pay over such refund to the Issuer (but only to the extent of such Additional Amounts), net of all out-of-pocket

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expenses of such holder, together with any interest paid by the relevant tax authority in respect of such refund.

2.7.4If Additional Amounts are required to be paid under this Section 2.7 as a result of a Tax Event, the Issuer may elect to redeem outstanding TCPL Sub Notes - Series 2019-A pursuant to Section 3.3.

2.8Transfer Restriction

Notwithstanding any provision of the Original Indenture, the TCPL Sub Notes - Series 2019-A may not be assigned or transferred by the Holder thereof without the prior consent of the Issuer.

ARTICLE 3

REDEMPTION AND PURCHASE FOR CANCELLATION OF THE TCPL SUB NOTES — SERIES 2019-A

3.1Redemption of TCPL Sub Notes - Series 2019-A at the Option of the Issuer

On or after September 15, 2029, the Issuer may, at its option, redeem the TCPL Sub Notes - Series 2019-A in whole at any time or in part from time to time on any Interest Payment Date and on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders, at a redemption price per $1,000 principal amount of the TCPL Sub Notes - Series 2019-A equal to par, together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.2Partial Redemption of TCPL Sub Notes - Series 2019-A

3.2.1If less than all the TCPL Sub Notes — Series 2019-A are to be redeemed pursuant to Section 3.1, the Issuer shall, at least 15 days prior to the date that notice of redemption is given, notify the Trustee by Written Order of the Issuer of its intention to redeem the aggregate principal amount of the TCPL Sub Notes - Series 2019-A to be redeemed. The TCPL Sub Notes - Series 2019-A to be redeemed shall be selected by the Trustee on a pro rata basis, disregarding fractions, according to the principal amount of the TCPL Sub Notes - Series 2019-A registered in the respective names of each Holder, or in such other manner as the Trustee may consider equitable, provided that such selection shall be proportionate (to the nearest minimum authorized denomination for the TCPL Sub Notes - Series 2019-A established pursuant to Section 2.3).

3.2.2If the TCPL Sub Notes - Series 2019-A in denominations in excess of the minimum authorized denomination for the TCPL Sub Notes - Series 2019-A are selected and called for redemption in part only (such part being that minimum authorized denomination or an integral multiple thereof) then, unless the context otherwise requires, references to the TCPL Sub Notes - Series 2019-A in this Article 3 shall be deemed to include any such part of the principal amount of the TCPL Sub Notes - Series 2019-A which shall have been so selected and called for redemption. The Holder of any TCPL Sub Notes - Series 2019-A called for redemption in part only, upon surrender of such TCPL Sub Notes - Series 2019-A for payment, shall be entitled to receive, without expense to such Holder, new TCPL Sub Notes - Series 2019-A for the unredeemed part of the TCPL Sub Notes - Series 2019-A so surrendered, and the Issuer shall execute and the Trustee shall certify and deliver, at the expense of the Issuer, such new TCPL Sub Notes - Series 2019-A having the same terms as are set out herein upon receipt from the Trustee or the Paying Agent of the TCPL Sub Notes - Series 2019-A so surrendered.

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3.3Early Redemption upon a Tax Event

The Issuer may, at its option, redeem all (but not less than all) of the TCPL Sub Notes - Series 2019-A upon the occurrence of a Tax Event on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders.  The redemption price per $1,000 principal amount of the TCPL Sub Notes - Series 2019-A shall be equal to par together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.4Early Redemption upon Rating Event

The Issuer may, at its option, redeem all (but not less than all) of the TCPL Sub Notes - Series 2019-A at any time upon or following the occurrence of a Rating Event on not less than 30 days nor more than 60 days prior notice to the Holders thereof, without the consent of the Holders.  The redemption price per $1,000 principal amount of the TCPL Sub Notes - Series 2019-A shall be equal to par plus $20 together with accrued and unpaid interest to, but excluding, the date fixed for redemption.

3.5Notice of Redemption

Notice of any intention to redeem any TCPL Sub Notes - Series 2019-A shall be given by or on behalf of the Issuer to the Holders of the TCPL Sub Notes - Series 2019-A which are to be redeemed, not more than 60 days and not less than 30 days prior to the date fixed for redemption, in the manner provided in the Original Indenture. The notice of redemption shall, unless all the TCPL Sub Notes - Series 2019-A then outstanding are to be redeemed, specify the distinguishing letters and numbers of the TCPL Sub Note - Series 2019-A which are to be redeemed and, if a TCPL Sub Notes - Series 2019-A is to be redeemed in part only, shall specify that part of the principal amount thereof to be redeemed, and shall specify the redemption date, the redemption price and places of payment and shall state that all interest on the TCPL Sub Notes - Series 2019-A called for redemption shall cease from and after such redemption date.

3.6Purchase of the TCPL Sub Notes - Series 2019-A for Cancellation

3.6.1The Issuer may, purchase all or any of the TCPL Sub Notes - Series 2019-A in the open market (which may include purchases from or through an investment dealer or a firm holding membership on or that is a participant of a recognized stock exchange) or by invitation for tenders or by private contract and, in each case, at any price.

3.6.2If, upon an invitation for tenders, more TCPL Sub Notes - Series 2019-A than the Issuer is willing to purchase are tendered at the same lowest price, the TCPL Sub Notes - Series 2019-A to be purchased by the Issuer shall be selected by the Trustee pro rata, or in such other manner as the Trustee may consider equitable in compliance with applicable law, from the TCPL Sub Notes - Series 2019-A tendered by each Holder who tendered at such lowest price. For this purpose, the Trustee may make, and from time to time amend, regulations with respect to the manner in which the TCPL Sub Notes - Series 2019-A may be so selected and regulations so made shall be valid and binding upon all Holders, notwithstanding the fact that, as a result thereof, one or more of such TCPL Sub Notes - Series 2019-A become subject to purchase in part only. The Holder of any TCPL Sub Notes - Series 2019-A of which a part only is purchased, upon surrender of such TCPL Sub Notes - Series 2019-A for payment, shall be entitled to receive, without expense to such Holder, one or more new TCPL Sub Notes - Series 2019-A for the unpurchased part so surrendered and the Trustee shall certify and deliver such new TCPL Sub Notes - Series 2019-A upon receipt of the TCPL Sub Notes - Series 2019-A so surrendered.

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3.7Cancellation of the TCPL Sub Notes - Series 2019-A

All TCPL Sub Notes - Series 2019-A redeemed and all TCPL Sub Notes - Series 2019-A purchased under this Article 3 shall forthwith be delivered to the Trustee and shall be cancelled by it and will not be reissued or resold, and except as provided in subsection 3.6.2, no TCPL Sub Notes - Series 2019-A shall be issued in substitution therefor.

ARTICLE 4

INDENTURE SUPPLEMENTAL TO ORIGINAL INDENTURE

4.1Indenture Supplemental to Original Indenture

This supplemental indenture is supplemental to the Original Indenture within the meaning of the Original Indenture and the Original Indenture, all indentures supplemental thereto and this supplemental indenture shall, subject to Section 1.9 of the Original Indenture, be read together and have the effect so far as practicable as though all the provisions thereof and hereof were contained in one instrument.

ARTICLE 5

ACCEPTANCE OF TRUSTS BY TRUSTEE

5.1Acceptance of Trusts by Trustee

The Trustee hereby accepts the trusts and duties declared and provided for in, and as otherwise contemplated by, this supplemental indenture and hereby agrees to perform the same upon the terms and conditions set forth herein and as contemplated hereby and in the Original Indenture, in each case as supplemented or amended from time to time.

ARTICLE 6

MISCELLANEOUS

6.1Counterparts

This supplemental indenture may be executed in several counterparts, including by facsimile or in electronic form, each of which when so executed shall be deemed to be an original, and such counterparts together shall constitute one and the same instrument and notwithstanding their date of execution shall be deemed to bear the same date as of the date hereof.

6.2Language of Indenture

The parties hereto have requested that this document, including the Schedules, be drafted in the English language.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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IN WITNESS WHEREOF the parties hereto have executed this supplemental indenture under the hands of their proper officers duly authorized in that behalf.

TRANSCANADA PIPELINES LIMITED
By:	/s/ Joel E. Hunter
Name:	Joel E. Hunter
Title:	Senior Vice-President, Capital Markets
By:	/s/ Christine R. Johnston
Name:	Christine R. Johnston
Title:	Vice-President, Law and Corporate Secretary
COMPUTERSHARE TRUST COMPANY OF CANADA
By:	/s/ Beatriz Fedozzi
Name:	Beatriz Fedozzi
Title:	Corporate Trust Officer
By:	/s/ Angela Fletcher
Name:	Angela Fletcher
Title:	Corporate Trust Officer

[Signature page to TCPL Sub Note Supplemental Indenture]

SCHEDULE 2.3

FORM OF REGISTERED TCPL SUB NOTE — SERIES 2019-A

No.

TRANSCANADA PIPELINES LIMITED

(a corporation existing under the Canada Business Corporations Act)

TCPL Sub Notes — Series 2019-A Due September 15, 2079

TRANSCANADA PIPELINES LIMITED (the “Issuer”) for value received hereby acknowledges itself indebted and promises to pay to the registered holder hereof (the “Holder”) on September 15, 2079 or on such earlier date as the principal amount hereof may become due in accordance with the provisions of the Indenture hereinafter mentioned, the principal sum of

[·] DOLLARS

($·)

in lawful money of the United States on presentation and surrender of this TCPL Sub Note - Series 2019-A (as defined below) at the principal office of the Trustee in the City of Calgary, Alberta or such other location as it may designate from time to time, and to pay interest on the principal amount hereof from and including the date hereof, or from and including the last Interest Payment Date (as defined in the Indenture) to which interest shall have been paid or made available for payment on the outstanding TCPL Sub Notes - Series 2019-A, whichever is later, at the rate of 5.75% per annum, in like money at any one of the said places, in arrears in equal semi-annual payments on March 15 and September 15 in each year (or the next following Business Day (as defined in the Indenture) if such date is not a Business Day to the persons in whose names the TCPL Sub Notes - Series 2019 are registered at the close of business on the preceding March 1 or September 1, respectively) from September 15, 2019 to, but excluding, September 15, 2029.  Notwithstanding the foregoing, the initial interest payment on March 15, 2020, will be $29.23 per $1,000 principal amount of TCPL Sub Notes Series 2019-A.  Subject to any Benchmark Replacement Conforming Changes (as defined in the Indenture), from September 15, 2029 and on every Interest Reset Date (as defined in the Indenture) thereafter until September 15, 2079, the interest payable on the TCPL Sub Notes - Series 2019-A will be reset as follows: (i) at an interest rate per annum equal the Benchmark (as defined in the Indenture) at the Reference Time (as defined in the Indenture) relating to such Interest Reset Date plus 4.404%, payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year to the persons in whose names the TCPL Sub Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such variable rate being on December 15, 2029; and (ii) at an interest rate per annum equal to the Benchmark at the Reference Time relating to such Interest Reset Date plus 5.154%, payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year to the persons in whose names the TCPL Sub Notes - Series 2019-A are registered at the close of business on the preceding March 1, June 1, September 1 or December 1, respectively, with the first payment at such a rate being on December 15, 2049.

This TCPL Sub Note - Series 2019-A is one of the TCPL Sub Notes - Series 2019-A due September 15, 2079 (the “TCPL Sub Notes - Series 2019-A”) of the Issuer issued or issuable under the provisions of a trust indenture made as of May 20, 2015 between the Issuer and Computershare Trust Company of Canada, as trustee (the “Trustee”), as supplemented by a fifth supplemental indenture dated September 12, 2019 between the Issuer and the Trustee (which trust indenture as so supplemented is herein referred to as the “Indenture”). The TCPL Sub Notes - Series 2019-A issuable under the Indenture are limited to an aggregate principal amount of up to $1,100,000,000, in lawful money of the United States. Reference is hereby expressly made to the Indenture for a description of the terms and conditions upon which the TCPL Sub Notes - Series 2019-A are or are to be issued and held and the rights, remedies and obligations of the holders of the TCPL Sub Notes - Series 2019-A, of the Issuer and of the Trustee in respect thereof, all to the same effect as if the provisions of the Indenture were herein set forth, to all of which provisions the Holder by acceptance hereof acknowledges and assents.

As interest on this TCPL Sub Note- Series 2019-A becomes due, the Issuer (except in the case of payment at maturity, at which time payment of interest may be made upon surrender of this TCPL Sub Note- Series 2019-A) shall on each date on which interest becomes due, forward or cause to be forwarded to the Holder in the manner provided therein, a cheque by first class mail, postage prepaid or an electronic transfer of funds for such interest. Subject to the provisions of the Indenture, the forwarding of such cheque or effecting of such transfer shall satisfy and discharge all liability for interest on this TCPL Sub Note - Series 2019-A to the extent of the sum represented by such cheque or electronic transfer.

The TCPL Sub Notes - Series 2019-A are issuable only as fully registered TCPL Sub Notes - Series 2019-A in the denominations of $1,000 and integral multiples thereof. Upon compliance with the provisions of the Indenture, the TCPL Sub Notes - Series 2019-A of any denomination may be exchanged for an equal aggregate principal amount of the TCPL Sub Notes - Series 2019-A in any other authorized denomination or denominations.

The TCPL Sub Notes - Series 2019-A are direct obligations of the Issuer but are not secured by any mortgage, pledge, hypothec or other charge.

The indebtedness evidenced by this TCPL Sub Note - Series 2019-A and by all other TCPL Sub Notes - Series 2019-A now or hereafter certified and delivered under the Indenture is subordinated and subject in right of payment, to the extent and in the manner provided in the Indenture, to the prior payment of all Issuer Senior Indebtedness (as defined in the Indenture), whether outstanding at the date of the Indenture or thereafter created, incurred, assumed or guaranteed.

The right is reserved to the Issuer to purchase or redeem the TCPL Sub Notes - Series 2019-A for cancellation in accordance with the provisions of the Indenture.

The Indenture contains provisions making binding upon all Holders of the TCPL Sub Notes - Series 2019-A outstanding thereunder resolutions passed at meetings of Holders of the TCPL Sub Notes - Series 2019-A held in accordance with such provisions and instruments signed by the Holders of a specified majority of the TCPL Sub Notes - Series 2019-A.

The TCPL Sub Notes - Series 2019-A may not be assigned or transferred by the Holder thereof without the prior consent of the Issuer.

This TCPL Sub Note - Series 2019-A shall be governed by and construed in accordance with the laws of the Province of Ontario and the laws of Canada applicable therein.

2

This TCPL Sub Note - Series 2019-A shall not become obligatory for any purpose until it shall have been certified by the Trustee under the Indenture.

IN WITNESS WHEREOF this TCPL Sub Note - Series 2019-A has been duly executed by the Issuer.

DATED as of                          , 2

TRANSCANADA PIPELINES LIMITED

By:

Name:

Title:

By:

Name:

Title:

3

(FORM OF TRUSTEE’S CERTIFICATE)

This TCPL Sub Note - Series 2019-A is one of the TCPL Sub Notes - Series 2019-A due September 15, 2079 referred to in the Indenture within mentioned.

COMPUTERSHARE TRUST COMPANY OF CANADA, Trustee

By:
	(Authorized Signing Officer)

(FORM OF REGISTRATION PANEL)

(No writing hereon except by Trustee or other Registrar)

Date of Registration In Whose Name Registered Trustee or Registrar

(FORM OF CONSENT AND CERTIFICATE OF TRANSFER)

CERTIFICATE OF CONSENT AND TRANSFER

TransCanada PipeLines Limited hereby consents to the transfer of TCPL Sub Notes - Series 2019-A set forth below.

TRANSCANADA PIPELINES LIMITED

By:

Name:

Title:

By:

Name:

Title:

I or we assign and transfer this TCPL Sub Note - Series 2019-A to:

(Print or type assignee’s name, address and postal code)

and irrevocably appoint                           agent to transfer this TCPL Sub Note - Series 2019-A on the books of TransCanada PipeLines Limited. The agent may substitute another to act for him.

Date:	Your Signature:
		(Sign exactly as your name appears on the TCPL Sub Notes - Series 2019-A)