Document:

EX-4.20

 Exhibit 4.20 

THIRD SUPPLEMENTAL INDENTURE 

THIRD SUPPLEMENTAL INDENTURE (the “Supplemental Indenture”), dated as of November 20, 2012 by and among Encana Corporation, a
corporation duly organized and existing under the laws of Canada (the “Corporation”), having its principal office at 1800, 855 2nd Street S.W., Calgary, Alberta T2P 2S5, and The Bank of
Nova Scotia Trust Company of New York, as trustee under the Indenture referred to below (the “Trustee”). 
 WHEREAS, the
Corporation (as successor by amalgamation to PanCanadian Petroleum Limited) and the Trustee are parties to that certain indenture, dated as of November 5, 2001 (as amended by the First Supplemental Indenture dated as of January 1, 2002, and as
amended by the Second Supplemental Indenture dated as of January 1, 2003, the “Indenture”), under which the Corporation may issue from time to time unsecured debentures, notes or other evidences of indebtedness in an unlimited aggregate
principal amount issuable in one or more series as provided therein and pursuant to which the Corporation’s 7.2% Notes due 2031 (the “Securities”) were issued; 

WHEREAS, Section 901(9) of the Indenture provides that without the consent of any Holders, the Corporation, when authorized by or pursuant to
a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental thereto, in form satisfactory to the Trustee, to cure any ambiguity, or to correct or supplement any provision therein which
may be inconsistent with any other provision therein, provided such action shall not adversely affect the interests of the Holders of Securities and any related coupons in any material respect; 

WHEREAS, Section 902 of the Indenture provides that with the consent of the Holders of not less than a majority in principal amount of all
Outstanding Securities, the Corporation, when authorized by or pursuant to a Board Resolution, and the Trustee may enter into indentures supplemental thereto for the purpose of changing in any manner or eliminating any of the provisions of the
Indenture or modifying in any manner the rights of the Holders of the Securities under the Indenture; 
 WHEREAS, the Corporation issued a
Consent Solicitation Statement dated as of November 5, 2012 (the “Consent Solicitation Statement”) to, among other things, solicit consents from the Holders to certain amendments to the Indenture as set forth in the Consent Solicitation
Statement; 
 WHEREAS, the Holders of not less than a majority in principal amount of the Outstanding Securities have given and not
withdrawn their written consent to the amendment to the Indenture contemplated by Section 2(b) of this Supplemental Indenture; and 

WHEREAS, the entry into of this Supplemental Indenture by the parties hereto is in all respects authorized by the provisions of the Indenture,
and all things necessary to make this Supplemental Indenture a valid agreement of the Corporation and the Trustee in accordance with its terms have been done. 

 NOW, THEREFORE, for and in consideration of the premises contained herein, it is mutually
covenanted and agreed for the benefit of all Holders of the Securities as follows: 
 1. Definitions. All capitalized terms used and
not otherwise defined herein have the respective meanings ascribed to such terms in the Indenture. 
 2. Amendments. 

 

	 	(a)	Section 101(3) is hereby amended and restated in its entirety to read as follows: 

 “all
accounting terms not otherwise defined herein have the meanings assigned to them in accordance with generally accepted accounting principles, and, except as otherwise herein expressly provided, the term “generally accepted accounting
principles” means GAAP; and” 
  

	 	(b)	The definition of “GAAP” in Section 101 is hereby amended and restated in its entirety to read as follows: 

“GAAP” means generally accepted accounting principles in Canada which are in effect from time to time, unless the Person’s most
recent audited or quarterly financial statements are not prepared in accordance with generally accepted accounting principles in Canada, in which case “generally accepted accounting principles” shall mean generally accepted accounting
principles in the United States in effect from time to time. 
 3. Effect. This Supplemental Indenture shall become effective upon its
execution and delivery by the parties hereto. 
 4. Responsibility of Trustee. The Trustee shall not be responsible for the validity
as to the Corporation or sufficiency of this Supplemental Indenture or as to the due execution hereof by the Corporation or as to recitals of fact contained herein, all of which are made solely by the Corporation. 

5. GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 

6. Counterparts. This Supplemental Indenture may be executed in one or more counterparts, each of which shall be an original, but all of
which together shall constitute one and the same document. 

  
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 7. Effect on Indenture. This Supplemental Indenture shall form a part of the Indenture for
all purposes and every holder of Securities heretofore or hereafter authenticated and delivered shall be bound hereby. Except as expressly set forth herein, the Indenture is in all respects ratified and confirmed and all the terms, conditions and
provisions thereof shall remain in full force and effect. 
 [Remainder of page intentionally left blank.] 

  
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 IN WITNESS WHEREOF, the parties have executed this Supplemental Indenture as of the date first
above written. 
  

			
	Encana Corporation
		
	By:	 	/s/ Corey D. Code
	Name:	 	Corey D. Code
	Title:	 	 Vice-President, Portfolio
 Management &
Assistant Treasurer

  

			
	The Bank of Nova Scotia Trust Company of New York, as Trustee
		
	By:	 	/s/ Warren A. Goshine
	Name:	 	Warren A. Goshine
	Title:	 	Vice President

 [Signature page to Third Supplemental Indenture to 2001 Indenture.]EX-4.21

 Exhibit 4.21 

FOURTH SUPPLEMENTAL INDENTURE 

FOURTH SUPPLEMENTAL INDENTURE (the “Supplemental Indenture”), dated as of July 24, 2013, by and among Encana Corporation, a
corporation duly organized and existing under the laws of Canada (the “Corporation”), having its principal office at Suite 4400, 500 Centre Street S.E., P.O. Box 2850, Calgary, Alberta T2P 2S5, and The Bank of New York Mellon, as successor
trustee under the Indenture referred to below (the “Trustee”). 
 WHEREAS, the Corporation (as successor by amalgamation to
PanCanadian Petroleum Limited) and The Bank of Nova Scotia Trust Company of New York, as retiring trustee under the Indenture referred to below (the “Retiring Trustee”) are parties to that certain indenture, dated as of November 5, 2001
(as amended by the First Supplemental Indenture dated as of January 1, 2002, as amended by the Second Supplemental Indenture dated as of January 1, 2003, and as amended by the Third Supplemental Indenture dated as of November 20, 2012, the
“Indenture”), under which the Corporation may issue from time to time unsecured debentures, notes or other evidences of indebtedness in an unlimited aggregate principal amount issuable in one or more series as provided therein and pursuant
to which the Corporation’s 7.2% Notes due 2031 (the “Securities”) were issued; 
 WHEREAS, the Retiring Trustee has provided
notice to the Corporation dated as of June 19, 2013 of its resignation as trustee under the Indenture with respect to the Securities; 

WHEREAS, the Corporation, the Retiring Trustee and the Trustee have entered into an Agreement of Resignation, Appointment and Acceptance,
dated as of July 24, 2013, whereby, among other things, (i) the Corporation has appointed the Trustee as successor Trustee under the Indenture and as successor to the Retiring Trustee in any other capacity in which the Retiring Trustee acts pursuant
to the Indenture, (ii) the Retiring Trustee has assigned, transferred, delivered and conferred to the Trustee all of its rights, title and interest under the Indenture and (iii) the Trustee has accepted its appointment as successor Trustee and as
successor to the Retiring Trustee in such other capacity in which the Retiring Trustee acts pursuant to the Indenture; 
 WHEREAS, Section
901(9) of the Indenture provides that without the consent of any Holders, the Corporation, when authorized by or pursuant to a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental
thereto, in form satisfactory to the Trustee, to close the Indenture with respect to the authentication and delivery of additional series of Securities, to cure any ambiguity, to correct or supplement any provision in the Indenture which may be
inconsistent with any other provision in the Indenture, or to make any other provisions with respect to matters or questions arising under the Indenture; provided such action shall not adversely affect the interests of the Holders of Securities of
any series and any related coupons in any material respect; 

 WHEREAS, the entering into of this Supplemental Indenture by the parties hereto is in all
respects authorized by the provisions of the Indenture, and all things necessary to make this Supplemental Indenture a valid agreement of the Corporation and the Trustee in accordance with its terms have been done. 

NOW, THEREFORE, for and in consideration of the premises contained herein, it is mutually covenanted and agreed for the benefit of all Holders
of the Securities as follows: 
 1. Definitions. All capitalized terms used and not otherwise defined herein have the respective
meanings ascribed to such terms in the Indenture. 
 2. Amendments. 

 

	 	(a)	The definition of “Corporate Trust Office” in Section 101 is hereby amended and restated in its entirety to read as follows: 

“Corporate Trust Office” means the principal corporate trust office of the Trustee, at which at any particular time its corporate
trust business shall be administered, which office on the date of execution of this Indenture is located at 101 Barclay Street, Floor 4 East, New York, New York 10286, except that with respect to presentation of Securities for payment or for
registration of transfer or exchange, such term shall mean the office or agency of the Trustee at which, at any particular time, its corporate agency business shall be conducted. 

 

	 	(b)	Section 105(1) is hereby amended and restated in its entirety to read as follows: 

 “(1)
the Trustee by any Holder or by the Company shall be sufficient for every purpose hereunder if made, given, furnished or filed in writing to or with the Trustee at its Corporate Trust Office, Attention: International Corporate Trust, or” 

 

	 	(c)	Section 202 is hereby amended and restated in its entirety to read as follows: 

 “Subject
to Section 611, the Trustee’s certificate of authentication shall be in substantially the following form: 
 TRUSTEE’S CERTIFICATE
OF AUTHENTICATION 
 Dated:
                         

This is one of the Securities of the series designated therein referred to in, and issued under, the within-mentioned Indenture. 

 

					
	 THE BANK OF NEW YORK MELLON, as Trustee

  
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	 By
	 	  

	 Authorized Signatory”

  

	 	(d)	The final paragraph of Section 611 is hereby amended and restated in its entirety to read as follows: 

“If an appointment with respect to one or more series is made pursuant to this Section, the Securities of such series may have endorsed
thereon, in addition to the Trustee’s certificate of authentication, an alternate certificate of authentication in the following form: 

Dated:                      

This is one of the Securities of a series referred to in, and issued under, the within-mentioned Indenture. 

 

					
	 THE BANK OF NEW YORK MELLON, as Trustee

		
	 By
	 	  

	 as Authenticating Agent

		
	 By
	 	  

	 Authorized Signatory”

 3. Effect. This Supplemental Indenture shall become effective upon its execution and delivery by
the parties hereto. 
 4. Responsibility of Trustee. The Trustee shall not be responsible for the validity as to the Corporation or
sufficiency of this Supplemental Indenture or as to the due execution hereof by the Corporation or as to recitals of fact contained herein, all of which are made solely by the Corporation. 

5. Governing Law. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New
York. 
 6. Counterparts. This Supplemental Indenture may be executed in one or more counterparts, each of which shall be an original,
but all of which together shall constitute one and the same document. 
 7. Effect on Indenture. This Supplemental Indenture shall
form a part of the Indenture for all purposes and every holder of Securities heretofore or hereafter authenticated and delivered shall be bound hereby. Except as expressly set forth herein, the Indenture is in all respects ratified and confirmed and
all the terms, conditions and provisions thereof shall remain in full force and effect. 
 [Remainder of page intentionally left
blank.] 

  
 3 

 IN WITNESS WHEREOF, the parties have executed this Supplemental Indenture as of the date first
above written. 
  

			
	Encana Corporation
		
	By:	 	/s/ Sherri A. Brillon
	Name:	 	Sherri A. Brillon
	Title:	 	 Executive Vice-President &
 Chief Financial
Officer

  

			
	 By:
	 	/s/ Gerald T. Ince
	 Name:
	 	 Gerald T. Ince

	 Title:
	 	 Vice-President & Treasurer

  

			
	The Bank of New York Mellon, as Trustee
		
	By:	 	 /s/ Catherine F. Donohue

	Name:	 	CATHERINE F. DONOHUE
	Title:	 	VICE PRESIDENT
		
		 	

 [Signature page to Fourth Supplemental Indenture to 2001 Indenture.]

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