Document:

Exhibit 10.21

  

	 	
         

        INX Limited

        1.02 World Trade Center

        6 Bayside Road

        GX11 1AA, Gibraltar

 

 

 

	 	September 21, 2018

 

	To:	 
	Thomas Lewis	-Via Email-

 

Re: Invitation to
serve as a Member of the Board of Directors of INX Ltd.

 

Dear Tom,

 

We are pleased to invite
you to serve as a member of the Board of Directors (the “Board”) of INX Ltd., a company incorporated under
the laws of Gibraltar (the “Company”), under the terms set forth below:

 

		1.	As a member of the Board you will (the “Services”):

 

		●	assist, guide and contribute from your expertise in steering the Company’s operations;

 

		●	agree to the use of your credentials, photo and bio on the Company’s website
and other promotional and marketing materials at the sole discretion of the Company (including without limitation, in connection
with the regulated public offering of Tokens contemplated by the Company (the “RCO”) and all other commercial and technological
activities and operations of the Company and its affiliates);

 

		●	assist the Company in developing key contacts, including with potential clients,
business partners, and investors, for its benefit to accelerate and further enable its R&D, business development, marketing
and financing efforts using your professional experience, knowledge, and business and personal contacts;

 

		●	support the Company in its interactions with third parties such as potential
strategic partners that can help accelerate development of fund raising activities to support the execution of the Company’s
R&D plan, business development operations and financing efforts;

 

		●	participate in various meetings of the Board and its committees, in person
or via remote communication, as shall be instructed by the Board (which are expected to be held by phone on a monthly basis and
in person or via video conference on a quarterly basis). In addition, the Company wishes that you will be available for ongoing
consultation on a regular basis. Provided that such consultation shall consist of no less than: (i) ten (10) hours per calendar
month; or (ii) sixty (60) hours per each consecutive period of six (6) calendar months;

 

		●	assist the Company in presenting relevant information during marketing meetings
with prospective strategic clients, as well as in meetings with prospective investors and strategic partners;

   

    	 	1	 

     

    

  

 

		2.	In consideration for
                                         the Services you will be paid a monthly fee (the “Fee”) in the amount
                                         of US$ 1,500, which will be paid within 14 days following the end of each calendar month
                                         of Services against a valid invoice. Additionally, upon and subject to the RCO Effective
                                         Date, you will be entitled to the right to purchase 350,000 INX Tokens generated and
                                         issued by the Company (the “Tokens”) in consideration for US$ 0.01
                                         per each Token and to a monthly issuance of 3,500 Tokens per month of Services following
                                         the RCO Effective Date, in consideration for US$ 0.01 per each Token. For the purpose
                                         of this Letter, the RCO Effective Date shall mean: 6 months after declaration by the
                                         SEC of the effectiveness of the RCO.

 

		3.	The Company will reimburse you for all necessary and reasonable
travel and business expenses you incur in connection with your duties as a member of the Board, provided that such expenses have
been approved by the Company in advance and are properly itemized and documented, and according to applicable Company policies
from time to time.

 

		4.	You shall be solely responsible to pay all taxes, levies,
social benefits, insurance payments and any other payments required by law in connection with your engagement with the Company
(including, inter alia, in connection with the Fee and the Tokens) provided, however, that the Company shall be entitled
to withhold, deduct or set-off any amounts due, as may be required by, and subject to, applicable law, from any payments due to
you hereunder (including the Tokens) or in connection with this Letter.

 

		5.	As a member of the Board, you will be covered by the directors’
and officers’ insurance policy of the Company (pursuant to the terms thereof).

 

		6.	It is hereby clarified that you shall perform the Services
as an independent contractor (and not as an agent, employee or representative of the Company).

 

		7.	The Company’s technology, trade secrets,
                                         business plans, financial information and any other proprietary information, including
                                         technical, business and financial information provided to you by the Company (“Confidential
                                         Information”) shall be kept in strict confidence and you shall be subject to
                                         the following obligations:

 

		●	You shall use the Confidential Information received solely in furtherance
of the business of the Company;

 

		●	You shall further refrain from copying or disclosing to
any third party, the Confidential Information received, except with the Company’s prior written consent; and

 

		●	Upon the written request of the Company, promptly destroy
or return any and all copies on any media containing such Confidential Information, except that you may keep one (1) copy thereof for the purpose of complying
with the terms of this Letter.

   

    	 	2	 

     

    

  

 

The confidentiality obligations
of this Letter shall not apply to any information that you can document (a) is already in the public domain through no breach of
this Letter; (b) was, as between the parties, lawfully in your possession prior to receipt from the Company; (c) is independently
developed by you without use of the Confidential Information; or (d) you are obligated to produce pursuant to an order of a court
of competent jurisdiction or a valid administrative or Congressional subpoena, provided that you promptly notify Company and cooperate
reasonably with Company’s efforts to contest or limit the scope of such order.

 

No patent, copyright, trademark
or other proprietary right or license is granted by this Letter or the disclosure of the Confidential Information.

 

This confidentiality undertaking
shall be perpetual, until such time as the Confidential Information shall have become public domain through no fault by you.

 

		8.	All intellectual property rights made by you in and during
the performance of the Services or directly result from the Confidential Information shall be sole property of the Company, it
being clear that intellectual property made by you for Noble4Advisors is excluded from this clause, and shall be the sole property
of Noble4Advisors.

 

		9.	The Company shall be entitled to disclose the fact that
you are a member of the Board at any time and refer any potential investor in the Company to you.

 

		10.	This Letter shall be exclusively governed by and construed
in accordance with the laws of Gibraltar.

 

		11.	This Letter shall be in effect as of September 28, 2018
and may be terminated by either the Company or yourself at any time and for any reason, upon written notice with immediate effectiveness.

 

	 	Sincerely yours, 
	 	 
	 	INX Ltd.

 

Agreed and Accepted:

  

	/s/ Thomas Lewis	 
	Thomas Lewis	 

 

 

September 28, 2018

  

    	 	3EX-4.1

 Exhibit 4.1 
  

 
  

WESTAR ENERGY, INC. 
 TO

 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 

as Trustee 
 (as
Successor to 
 HARRIS TRUST AND SAVINGS BANK) 
  

 
 FORTY-NINTH
SUPPLEMENTAL INDENTURE 
 to Original Mortgage Filed with Shawnee County Register of Deeds 

on July 1, 1939, at Book 778 Page 216 

Dated as of August 19, 2019 

First Mortgage Bonds, 3.25% Series due 2049 
  

 
  

 TABLE OF CONTENTS 

 
  

 

					
	 Parties
	  	 	1	 
	 Recitals
	  	 	1	 
	 Granting Clause
	  	 	5	 
	 Habendum
	  	 	7	 
	 Exceptions and Reservations
	  	 	8	 
		
	 	  	PAGE	 
	 ARTICLE I

DESCRIPTION OF BONDS OF THE 3.25% SERIES
DUE 2049
	  

 

		
	 Section 1. General Description of Bonds of the 3.25% Series due
2049
	  	 	9	 
	 Section 2. Denominations of Bonds of the 3.25% Series due 2049 and
Privilege of Exchange
	  	 	10	 
	 Section 3. Form of Bonds of the 3.25% Series due 2049
	  	 	10	 
	 Section 4. Execution and Form of Temporary Bonds of the 3.25%
Series due 2049
	  	 	19	 
	
	 ARTICLE II

ISSUE OF BONDS OF THE 3.25% SERIES DUE
2049
	  

 

		
	 Section 1. Limitation as to Principal Amount of Bonds of the 3.25%
Series due 2049
	  	 	19	 
	 Section 2. Execution and Delivery of Bonds of the 3.25% Series due
2049
	  	 	19	 
	 Section 3. Additional Bonds of the 3.25% Series due 2049
	  	 	19	 
	
	 ARTICLE III

REDEMPTION AND SUBSTITUTION OF BONDS OF
THE 3.25% SERIES DUE 2049
	  

 

		
	 Section 1. Optional Redemption of Bonds of the 3.25% Series due
2049
	  	 	20	 
	 Section 2. Substitution of Bonds of the 3.25% Series due
2049
	  	 	23	 
	
	 ARTICLE IV

ADDITIONAL COVENANTS
	  

 

		
	 Section 1. Title to Mortgaged Property
	  	 	24	 
	 Section 2. To Retire Certain Portions of Bonds upon Release of All
or Substantially All of the Electric Properties
	  	 	24	 

  
 ii 

					
	 ARTICLE V

AMENDMENTS AND RESERVATIONS OF RIGHTS TO
AMEND THE ORIGINAL INDENTURE
	  

 

		
	 Section 1. So Long as Bonds Issued Prior to
January 1, 1997 Remain Outstanding
	  	 	25	 
	 Section 2. Facsimile Signatures
	  	 	28	 
	 Section 3. Reservation of Right to Amend Article VII
	  	 	29	 
	 Section 4. Reservation of Right to Delete Certain Requirements and
Conditions
	  	 	32	 
	 Section 5. Issuance of Variable Rate Bonds
	  	 	32	 
	 Section 6. Substitution of Bonds
	  	 	32	 
	 Section 7. Addition of a Governing Law Clause
	  	 	33	 
	 Section 8. Event of Default for Failure to Pay Final Judgments in
Excess of $100,000
	  	 	33	 
	 Section 9. Net Earnings Test in Connection with Property
Acquisitions
	  	 	33	 
	 Section 10. Addition of Nuclear Fuel
	  	 	34	 
	 Section 11. Modernization of the Original Indenture
	  	 	34	 
	
	 ARTICLE VI

MISCELLANEOUS PROVISIONS
	  

 

		
	 Section 1. Acceptance of Trust
	  	 	35	 
	 Section 2. Responsibility and Duty of Trustee
	  	 	35	 
	 Section 3. Parties to Include Successors and Assigns
	  	 	36	 
	 Section 4. Benefits Restricted to Parties and to Holders of Bonds
and Coupons
	  	 	36	 
	 Section 5. Execution in Counterparts
	  	 	36	 
	 Section 6. Titles of Articles Not Part of the Forty-Ninth
Supplemental Indenture
	  	 	36	 
		
	 TESTIMONIUM
	  	 	S-1	 
	 SIGNATURES AND SEALS
	  	 	S-2	 
	 ACKNOWLEDGEMENTS
	  	 	S-3	 

  
 iii 

 FORTY-NINTH SUPPLEMENTAL INDENTURE, dated as of the 19th day of August, Two Thousand and Nineteen, made by and between Westar Energy, Inc., formerly The Kansas Power and Light Company, a corporation organized and existing under the laws of the State of
Kansas (and successor by the Merger (hereinafter defined) to Westar Energy, Inc., formerly The Kansas Power and Light Company, sometimes hereinafter called the “Company-Predecessor”) (hereinafter called the
“Company”), party of the first part, and The Bank of New York Mellon Trust Company, N.A., a national banking association whose mailing address is 2 North La Salle Street, Chicago, Illinois 60602 (hereinafter called the
“Trustee”), as Trustee (as successor to Harris Trust and Savings Bank), under the Mortgage and Deed of Trust dated July 1, 1939, hereinafter mentioned, party of the second part; 

WHEREAS, the Company has heretofore executed and delivered to the Trustee its Mortgage and Deed of Trust dated July 1, 1939 (hereinafter
referred to as the “Original Indenture”), to provide for and to secure the issue of First Mortgage Bonds of the Company, issuable in series, and to declare the terms and conditions upon which the Bonds (as defined in the Original
Indenture) are to be issued thereunder; and 
 WHEREAS, the Company has heretofore executed and delivered to the Trustee Forty-Eight
Supplemental Indentures, in addition to the Forty-Second Supplemental (Reopening) Indenture, supplemental to said Original Indenture, of which Forty-Six provided for the issuance thereunder of series of the
Company’s First Mortgage Bonds, and there is set forth below information with respect to such Supplemental Indentures as have provided for the issuance of Bonds, and the principal amount of Bonds which remain outstanding as of August 19,
2019: 
  

													
	 Supplemental Indenture
	  	 Date
	  	 Series of
First Mortgage
Bonds
Provided
For
	  	Principal
Amount
Issued	 	  	Principal
Amount
Outstanding	 
	 Supplemental Indenture
	  	July 1, 1939	  	3-1/2% Series Due 1969	  	$	26,500,000	 	  	 	None	 
	 Second Supplemental Indenture
	  	April 1, 1949	  	2-7/8% Series Due 1979	  	 	10,000,000	 	  	 	None	 
	 Fourth Supplemental Indenture
	  	October 1, 1949	  	2-3/4% Series Due 1979	  	 	6,500,000	 	  	 	None	 
	 Fifth Supplemental Indenture
	  	December 1, 1949	  	2-3/4% Series Due 1984	  	 	32,500,000	 	  	 	None	 
	 Seventh Supplemental Indenture
	  	December 1, 1951	  	3-1/4% Series Due 1981	  	 	5,250,000	 	  	 	None	 

  
 1 

													
	 Supplemental Indenture
	  	 Date
	  	 Series of
First Mortgage
Bonds
Provided
For
	  	Principal
Amount
Issued	 	  	Principal
Amount
Outstanding	 
	 Eighth Supplemental Indenture
	  	May 1, 1952	  	3-1/4% Series Due 1982	  	 	4,750,000	 	  	 	None	 
	 Ninth Supplemental Indenture
	  	October 1, 1954	  	3-1/8% Series Due 1984	  	 	8,000,000	 	  	 	None	 
	 Tenth Supplemental Indenture
	  	September 1, 1961	  	4-3/4% Series Due 1991	  	 	13,000,000	 	  	 	None	 
	 Eleventh Supplemental Indenture
	  	April 1, 1969	  	7-5/8% Series Due 1999	  	 	19,000,000	 	  	 	None	 
	 Twelfth Supplemental Indenture
	  	September 1, 1970	  	8-3/4% Series Due 2000	  	 	20,000,000	 	  	 	None	 
	 Thirteenth Supplemental Indenture
	  	February 1, 1975	  	8-5/8% Series Due 2005	  	 	35,000,000	 	  	 	None	 
	 Fourteenth Supplemental Indenture
	  	May 1, 1976	  	8-5/8% Series Due 2006	  	 	45,000,000	 	  	 	None	 
	 Fifteenth Supplemental Indenture
	  	April 1, 1977	  	5.90% Pollution Control Series Due 2007	  	 	32,000,000	 	  	 	None	 
	 Sixteenth Supplemental Indenture
	  	June 1, 1977	  	8-1/8% Series Due 2007	  	 	30,000,000	 	  	 	None	 
	 Seventeenth Supplemental Indenture
	  	February 1, 1978	  	8-3/4% Series Due 2008	  	 	35,000,000	 	  	 	None	 
	 Eighteenth Supplemental Indenture
	  	January 1, 1979	  	6-3/4% Pollution Control Series Due 2009	  	 	45,000,000	 	  	 	None	 
	 Nineteenth Supplemental Indenture
	  	May 1, 1980	  	8-1/4% Pollution Control Series Due 1983	  	 	45,000,000	 	  	 	None	 
	 Twentieth Supplemental Indenture
	  	November 1, 1981	  	16.95% Series Due 1988	  	 	25,000,000	 	  	 	None	 
	 Twenty-First Supplemental Indenture
	  	April 1, 1982	  	15% Series Due 1992	  	 	60,000,000	 	  	 	None	 

  
 2 

													
	 Supplemental Indenture
	  	 Date
	  	 Series of
First Mortgage
Bonds
Provided
For
	  	Principal
Amount
Issued	 	  	Principal
Amount
Outstanding	 
	 Twenty-Second Supplemental Indenture
	  	February 1, 1983	  	9-5/8% Pollution Control Series Due 2013	  	 	58,500,000	 	  	 	None	 
	 Twenty-Third Supplemental Indenture
	  	July 1, 1986	  	8-1/4% Series Due 1996	  	 	60,000,000	 	  	 	None	 
	 Twenty-Fourth Supplemental Indenture
	  	March 1, 1987	  	8-5/8% Series Due 2020	  	 	50,000,000	 	  	 	None	 
	 Twenty-Fifth Supplemental Indenture
	  	October 15, 1988	  	9.35% Series Due 1998	  	 	75,000,000	 	  	 	None	 
	 Twenty-Sixth Supplemental Indenture
	  	February 15, 1990	  	8-7/8% Series Due 2000	  	 	75,000,000	 	  	 	None	 
	 Twenty-Seventh Supplemental Indenture
	  	March 12, 1992	  	7.46% Demand Series	  	 	370,000,000	 	  	 	None	 
	 Twenty-Eighth Supplemental Indenture
	  	July 1, 1992	  	7-1/4% Series Due 1999	  	 	125,000,000	 	  	 	None	 
		  		  	8-1/2% Series Due 2022	  	 	125,000,000	 	  	 	None	 
	 Twenty-Ninth Supplemental Indenture
	  	August 20, 1992	  	7-1/4% Series Due 2002	  	 	100,000,000	 	  	 	None	 
	 Thirtieth Supplemental Indenture
	  	February 1, 1993	  	6% Pollution Control Revenue Refunding Series Due 2033	  	 	58,500,000	 	  	 	None	 
	 Thirty-First Supplemental Indenture
	  	April 15, 1993	  	7.65% Series Due 2023	  	 	100,000,000	 	  	 	None	 
	 Thirty-Second Supplemental Indenture
	  	April 15, 1994	  	7-1/2% Series Pollution Control Revenue Refunding Due 2032	  	 	75,500,000	 	  	 	75,500,000	 

  
 3 

													
	 Supplemental Indenture
	  	 Date
	  	 Series of
First Mortgage
Bonds
Provided
For
	  	Principal
Amount
Issued	 	  	Principal
Amount
Outstanding	 
	 Thirty-Third Supplemental Indenture
	  	August 11, 1997	  	6-7/8% Convertible Series Due 2004	  	 	370,000,000	 	  	 	None	 
		  		  	7-1/8% Convertible Series Due 2009	  	 	150,000,000	 	  	 	None	 
	 Thirty-Fourth Supplemental Indenture
	  	June 28, 2000	  	9-1/2% Series Due 2003	  	 	397,800,000	 	  	 	None	 
	 Thirty-Fifth Supplemental Indenture
	  	May 10, 2002	  	7-7/8% Series Due 2007	  	 	365,000,000	 	  	 	None	 
	 Thirty-Sixth Supplemental Indenture
	  	June 1, 2004	  	5.00% Series Pollution Control Refunding Revenue Due 2033	  	 	58,340,000	 	  	 	None	 
	 Thirty-Seventh Supplemental Indenture
	  	June 17, 2004	  	6.00% Series Due 2014	  	 	250,000,000	 	  	 	None	 
	 Thirty-Eighth Supplemental Indenture
	  	January 18, 2005	  	5.15% Series Due 2017	  	 	125,000,000	 	  	 	None	 
		  		  	5.95% Series Due 2035	  	 	125,000,000	 	  	 	None	 
	 Thirty-Ninth Supplemental Indenture
	  	June 30, 2005	  	5.10% Series Due 2020	  	 	250,000,000	 	  	 	250,000,000	 
		  		  	5.875% Series Due 2036	  	 	150,000,000	 	  	 	None	 
	 Fortieth Supplemental Indenture
	  	May 15, 2007	  	6.10% Series Due 2047	  	 	150,000,000	 	  	 	None	 
	 Forty-First Supplemental Indenture
	  	November 25, 2008	  	8.625% Series Due 2018	  	 	300,000,000	 	  	 	None	 
	 Forty-Second Supplemental Indenture
	  	March 1, 2012	  	4.125% Series Due 2042	  	 	250,000,000	 	  	 	250,000,000	 
	 Forty-Second Supplemental (Reopening) Indenture
	  	May 17, 2012	  	4.125% Series Due 2042	  	 	300,000,000	 	  	 	300,000,000	 

  
 4 

													
	 Supplemental Indenture
	  	 Date
	  	 Series of
First Mortgage
Bonds
Provided
For
	  	Principal
Amount
Issued	 	  	Principal
Amount
Outstanding	 
	 Forty-Third Supplemental Indenture
	  	March 28, 2013	  	4.10% Series Due 2043	  	 	430,000,000	 	  	 	430,000,000	 
	 Forty-Fourth Supplemental Indenture
	  	August 19, 2013	  	4.625% Series Due 2043	  	 	250,000,000	 	  	 	250,000,000	 
	 Forty-Fifth Supplemental Indenture
	  	November 13, 2015	  	 3.25% Series Due 2025

4.25% Series Due 2045
	  	 
 
	250,000,000
 300,000,000
	 
  
	  	 
 
	250,000,000
 300,000,000
	 
  

	 Forty-Sixth Supplemental Indenture
	  	June 20, 2016	  	2.55% Series Due 2026	  	 	350,000,000	 	  	 	350,000,000	 
	 Forty-Seventh Supplemental Indenture
	  	March 6, 2017	  	3.10% Series Due 2027	  	 	300,000,000	 	  	 	300,000,000	 

 ; and 
 WHEREAS,
pursuant to that Amended and Restated Agreement and Plan of Merger, dated as of July 9, 2017, by and among the Company-Predecessor, Great Plains Energy Incorporated, a corporation organized and existing under the laws of the State of Missouri,
Monarch Energy Holding, Inc., a corporation organized and existing under the laws of the State of Missouri (“Monarch Energy”), and King Energy, Inc., a corporation organized and existing under the laws of the State of Kansas and a
wholly owned subsidiary of Monarch Energy (“Merger Sub”), on June 4, 2018 Merger Sub merged with and into the Company-Predecessor, with the Company surviving the merger (the “Merger”), on such terms as fully to
preserve and in no respect impair the lien on the mortgaged property under the Original Indenture as amended by all indentures supplemental thereto (hereinafter sometimes collectively called the “Indenture”) or any of the rights or
powers of the Trustee or of the holders of the Bonds thereunder; and 
 WHEREAS, pursuant to the Forty-Eighth Supplemental Indenture to
supplement the Original Indenture, the Company, as a successor corporation resulting from the Merger, assumed the due and punctual performance and observance of all the covenants and conditions to be kept or performed by the Company-Predecessor
under the Indenture and the due and punctual payment of the principal of and interest on all Bonds now outstanding under the Indenture according to their tenor and to enable the Company to have and exercise powers and rights of the
Company-Predecessor under the Indenture in accordance with the terms thereof; and 

  
 5 

 WHEREAS, the Company is entitled at this time to have authenticated and delivered additional
bonds, upon compliance with the provisions of Article III of the Original Indenture, as amended; and 
 WHEREAS, the Company desires by this
Forty-Ninth Supplemental Indenture (hereinafter referred to as this “Supplemental Indenture”) to supplement the Original Indenture and to provide for the creation of a new series of bonds under the Original Indenture to be
designated “First Mortgage Bonds, 3.25% Series due 2049” (hereinafter called “Bonds of the 3.25% Series due 2049”); and the Original Indenture provides that certain terms and provisions, as determined by the Board of
Directors of the Company, of the Bonds of any particular series may be expressed in and provided by the execution of an appropriate supplemental indenture; and 

WHEREAS, the Company in the exercise of the powers and authority conferred upon and reserved to it under the provisions of the Original
Indenture and indentures supplemental thereto, and pursuant to appropriate resolutions of its Board of Directors, has duly resolved and determined to make, execute and deliver to the Trustee a supplemental indenture in the form hereof for the
purposes herein provided; and 
 WHEREAS, all conditions and requirements necessary to make this Supplemental Indenture a valid, binding and
legal instrument have been done, performed and fulfilled, and the execution and delivery hereof have been in all respects duly authorized; 

NOW, THEREFORE, THIS INDENTURE WITNESSETH: That, in consideration of the premises and of the mutual covenants herein contained and of the sum
of One Dollar duly paid by the Company to the Trustee at or before the time of the execution of these presents, and of other valuable considerations, the receipt whereof is hereby acknowledged, and in order further to secure the payment of the
principal of and interest and premium, if any, on all Bonds at any time issued and outstanding under the Original Indenture as amended by all indentures supplemental thereto (hereinafter sometimes collectively called the
“Indenture”) according to their tenor, purpose and effect, and to declare certain terms and conditions upon and subject to which Bonds are to be issued and secured, the Company has executed and delivered this Supplemental Indenture,
and by these presents grants, bargains, sells, warrants, aliens, releases, conveys, assigns, transfers, mortgages, pledges, sets over and ratifies and confirms unto The Bank of New York Mellon Trust Company, N.A., as Trustee, and to its successors
in trust under the Indenture forever, all and singular the following described properties (in addition to all other properties heretofore specifically subjected to the lien of the Indenture and not heretofore released from the lien thereof), that is
to say: 

  
 6 

 FIRST. 

All and singular the lands, real estate, chattels real, easements, servitudes, and leaseholds of the Company, or which, subject to the
provisions of Article XII of the Original Indenture, the Company may hereafter acquire, together with all improvements of any type located thereon. 

Also all power houses, plants, buildings and other structures, dams, dam sites, substations, heating plants, gas works, holders and tanks,
compressor stations, gasoline extraction plants, together with all and singular the electric heating, gas and mechanical appliances appurtenant thereto of every nature whatsoever, now owned by the Company or which it may hereafter acquire, including
all and singular the machinery, engines, boilers, furnaces, generators, dynamos, turbines and motors, and all and every character of mechanical appliance for generating or producing electricity, steam, water, gas and other agencies for light, heat,
cold or power or any other purpose whatsoever. 
 SECOND. 

Also all transmission and distribution systems used for the transmission and distribution of electricity, steam, water, gas and other agencies
for light, heat, cold or power, or any other purpose whatsoever, whether underground or overhead or on the surface or otherwise of the Company, or which, subject to the provisions of Article XII of the Original Indenture, the Company may hereafter
acquire, including all poles, posts, wires, cables, conduits, mains, pipes, tubes, drains, furnaces, switchboards, transformers, insulators, meters, lamps, fuses, junction boxes, water pumping stations, regulator stations, town border metering
stations and other electric, steam, water and gas fixtures and apparatus. 
 THIRD. 

Also all franchises and all permits, ordinances, easements, privileges and immunities and licenses, all rights to construct, maintain and
operate overhead, surface and underground systems for the distribution and transmission of electricity, gas, water or steam for the supply to itself or others of light, heat, cold or power or any other purpose whatsoever, all rights-of-way, all waters, water rights and flowage rights and all grants and consents, now owned by the Company or, subject to the provisions of Article XII of the Original
Indenture, which it may hereafter acquire. 
 Also all inventions, patent rights and licenses of every kind now owned by the Company or,
subject to the provisions of Article XII of the Original Indenture, which it may hereafter acquire. 

  
 7 

 FOURTH. 

Also, subject to the provisions of Article XII of the Original Indenture, all other property, real, personal and mixed (except as therein or
herein expressly excepted) of every nature and kind and wheresoever situated now or hereafter possessed by or belonging to the Company, or to which it is now, or may at any time hereafter be, in any manner entitled at law or in equity. 

FIFTH. 
 Also any and all
property of any kind or description which may from time to time after the date of the Original Indenture by delivery or by writing of any kind be conveyed, mortgaged, pledged, assigned or transferred to the Trustee by the Company or by any person,
copartnership or corporation, with the consent of the Company or otherwise, and accepted by the Trustee, to be held as part of the mortgaged property; and the Trustee is hereby authorized to accept and receive any such property and any such
conveyance, mortgage, pledge, assignment and transfer, as and for additional security hereunder, and to hold and apply any and all such property subject to and in accordance with the terms and provisions upon which such conveyance, mortgage, pledge,
assignment or transfer shall be made. 
 SIXTH. 

Together with all and singular, the tenements, hereditaments and appurtenances belonging or in anywise appertaining to the aforesaid property
or any part thereof, with the reversion and reversions, remainder and remainders, tolls, rents, revenues, issues, income, products and profits thereof, and all the estate, right, title, interest and claim whatsoever, at law and in equity, which the
Company now has or may hereafter acquire in and to the aforesaid property and franchises and every part and parcel thereof. 
 EXPRESSLY
EXCEPTING AND EXCLUDING, HOWEVER, all properties of the character excepted from the lien of the Original Indenture. 
 TO HAVE AND TO HOLD
all said properties, real, personal and mixed, mortgaged, pledged and conveyed by the Company as aforesaid, or intended so to be, unto the Trustee and its successors and assigns forever; 

SUBJECT, HOWEVER, to the exceptions and reservations hereinabove referred to, to existing leases other than leases which by their terms are
subordinate to the lien of the Indenture, to existing liens upon rights-of-way for transmission or distribution line purposes, as defined in Article I of the Original
Indenture; and any extensions thereof, and subject to existing easements for streets, alleys, highways, rights-of-way and railroad purposes over, upon and across certain
of the property herein before described and subject also to all the terms, conditions, agreements, covenants, exceptions and reservations expressed or provided in the deeds or other instruments respectively under and by virtue of which the Company
acquired the properties hereinabove described and to undetermined liens and charges, if any, incidental to construction or other existing permitted liens as defined in Article I of the Original Indenture; 

  
 8 

 IN TRUST, NEVERTHELESS, upon the terms and trusts in the Original Indenture, and the
indentures supplemental thereto, including this Supplemental Indenture, set forth, for the equal and proportionate benefit and security of all present and future holders of the Bonds and coupons issued and to be issued thereunder, or any of them,
without preference of any of said Bonds and coupons of any particular series over the Bonds and coupons of any other series by reason of priority in the time of issue, sale or negotiation thereof, or by reason of the purpose of issue or otherwise
howsoever, except as otherwise provided in Section 2 of Article IV of the Original Indenture. 
 AND IT IS HEREBY COVENANTED, DECLARED
AND AGREED, by and between the parties hereto for the benefit of those who shall hold the Bonds and coupons, or any of them, to be issued under the Indenture as follows: 

ARTICLE I 

DESCRIPTION OF BONDS OF THE 3.25% SERIES
DUE 2049 
 Section 1. General Description of Bonds of the 3.25% Series due
2049. The Bonds of the 3.25% Series due 2049 to be executed, authenticated and delivered under and secured by the Original Indenture shall be designated as “First Mortgage Bonds, 3.25% Series due 2049” of the Company. The
Bonds of the 3.25% Series due 2049 shall be executed, authenticated and delivered in accordance with the provisions of, and shall in all respects be subject to, all of the terms, conditions and covenants of the Indenture and subject to all the
terms, conditions and covenants of this Supplemental Indenture. 
 Bonds of the 3.25% Series due 2049 shall mature on September 1, 2049
and shall bear interest at the rate of 3.25 percent (3.25%) per annum payable semi-annually on the first day of March and September in each year, commencing March 1, 2020. Every Bond of the 3.25% Series due 2049 shall be dated the date of
authentication of such Bond except that, notwithstanding the provisions of Section 6 of Article II of the Original Indenture, if any Bond of the 3.25% Series due 2049 shall be authenticated at any time subsequent to the record date (as
hereinafter in this Section defined) for any interest payment date but prior to the day following such interest payment date, it shall be dated as of the day following such interest payment date, provided, however, if at the time of
authentication of any Bond of the 3.25% Series due 2049 interest shall be in default on any Bonds of the 3.25% Series due 2049, such Bond shall be dated as of the day following the interest payment date to which interest has previously been paid in
full or made available for payment in full on outstanding Bonds of the 3.25% Series due 2049, as the case may be, or, if no interest has been paid or made available for payment, as of the date of initial authentication and delivery of such Bond.
Every Bond of the 3.25% Series due 2049 shall bear interest from the March 1 or September 1 immediately preceding the date thereof, unless such Bond shall be dated prior to March 1, 2020, in which case it shall bear interest from
August 19, 2019. 

  
 9 

 The person in whose name any Bond of the 3.25% Series due 2049 is registered at the close of
business on any record date with regard to any interest payment date shall be entitled to receive the interest payable thereon on such interest payment date notwithstanding the cancellation of such Bond upon the transfer or exchange thereof
subsequent to such record date and prior to the day following such interest payment date, unless the Company shall default in the payment of the interest due on such interest payment date, in which case such defaulted interest shall be paid to the
person in whose name such Bond is registered on the date of payment of such defaulted interest. The term “record date” as used in this Section with regard to any March 1 and September 1 interest payment date shall mean
(i) the close of business on the Business Day immediately preceding such interest payment date for so long as all of the Bonds of the 3.25% Series due 2049 remain in book-entry only form or (ii) the fifteenth calendar day immediately
preceding each interest payment date if any of the Bonds do not remain in book-entry only form. The Bonds of the 3.25% Series due 2049 shall be payable as to principal, premium, if any, and interest, in any coin or currency of the United States of
America which at the time of payment is legal tender for public and private debts, at the agency of the Company in the City of Chicago, Illinois, or at the option of the holder thereof at the agency of the Company in the Borough of Manhattan, The
City of New York, provided that at the option of the Company interest may be paid by check mailed to the holder at such holder’s registered address. 

Section 2. Denominations of Bonds of the 3.25% Series due 2049 and Privilege of Exchange. The Bonds
of the 3.25% Series due 2049 shall be registered bonds without coupons of the minimum denominations of $2,000 and of any integral multiples of $1,000 in excess thereof, numbered consecutively from R-1. Bonds
of the 3.25% Series due 2049 may each be interchanged for other Bonds within the same Series in authorized denominations and in the same aggregate principal amounts, without charge, except for any tax or governmental charge imposed in connection
with such interchange. 
 Section 3. Form of Bonds of the 3.25% Series due 2049. The Bonds
of the 3.25% Series due 2049, and the Trustee’s Certificate with respect thereto, shall be substantially in the following forms, respectively: 

[Form of Bond appears on following page] 

  
 10 

 [FORM OF LEGEND FOR GLOBAL SECURITY] 

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE
THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN
THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE OR ANY SUPPLEMENT THERETO. 
 UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED BY
AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO A PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF,
CEDE & CO., HAS AN INTEREST HEREIN. 
 CUSIP 95709TAQ3 

WESTAR ENERGY, INC. 
 (Incorporated
under the laws of the State of Kansas) 
 FIRST MORTGAGE BOND, 3.25% Series due 2049 

DUE SEPTEMBER 1, 2049 
  

					
	No. R-1	  		  	$300,000,000.00

 WESTAR ENERGY, INC., a corporation organized and existing under the laws of the State of Kansas (hereinafter
called the “Company”, which term shall include any successor corporation as defined in the Indenture hereinafter referred to), for value received, hereby promises to pay to CEDE & CO. or registered assigns, on the first day
of September 2049, the principal sum of THREE-HUNDRED MILLION DOLLARS ($300,000,000.00) in any coin or currency of the United States of America which at the time of payment is legal tender for 

  
 11 

 
public and private debts, and to pay interest thereon in like coin or currency from the first day of March and September immediately preceding the date of this Bond, unless such Bond shall be
dated prior to March 1, 2020, in which case from August 19, 2019 at the rate of 3.25 percent (3.25%) per annum, payable semi-annually, on March 1 and September 1 of each year, commencing March 1, 2020, until maturity,
or, if this Bond shall be duly called for redemption or submitted for repurchase, until the redemption date or repurchase date, as the case may be, or, if the Company shall default in the payment of the principal or premium hereof, until the
Company’s obligation with respect to the payment of such principal or premium shall be discharged as provided in the Indenture hereinafter mentioned. The interest payable on any March 1 or September 1 interest payment date as
aforesaid will be paid to the person in whose name this Bond is registered at the close of business on the record date for the interest payment date, which will be (i) the close of business on the Business Day immediately preceding such
interest payment date for so as long as this Bond remains in book-entry only form or (ii) the fifteenth calendar day immediately preceding each interest payment date if this Bond does not remain in book-entry only form (the “record
date”), unless the Company shall default in the payment of the interest due on such interest payment date, in which case such defaulted interest shall be paid to the person in whose name this Bond is registered on the date of payment of
such defaulted interest. Principal of, premium, if any, and interest on, this Bond are payable at the agency of the Company in the City of Chicago, Illinois in immediately available funds, or at the option of the holder thereof at the agency of the
Company in the Borough of Manhattan, The City of New York, provided that at the option of the Company interest may be paid by check mailed to the holder at such holder’s registered address. 

This Bond is one of a duly authorized issue of Bonds of the Company (herein called the “Bonds”), in unlimited aggregate
principal amount, of the series hereinafter specified, all issued and to be issued under and equally and ratably secured by a Mortgage and Deed of Trust, dated July 1, 1939 (the “Original Mortgage”), executed by the Company to
The Bank of New York Mellon Trust Company, N.A. (herein called the “Trustee”), as Trustee (as successor to Harris Trust and Savings Bank), as amended by indentures supplemental thereto including the Forty-Ninth indenture
supplemental thereto dated as of August 19, 2019 (herein called the “Supplemental Indenture”), between the Company and the Trustee (said Original Mortgage, as so amended, being herein called the “Indenture”),
to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the properties mortgaged and pledged, the nature and extent of the security, the rights of the bearers or registered owners of the Bonds and of
the Trustee in respect thereto, and the terms and conditions upon which the Bonds are, and are to be, secured. The Bonds may be issued in series, for various principal sums, may mature at different times, may bear interest at different rates and may
otherwise vary as in the Indenture provided. This Bond is one of a series designated as the “First Mortgage Bonds, 3.25% Series due 2049” (herein called “Bonds of the 3.25% Series due 2049”) of the Company, issued under
and secured by the Indenture executed by the Company to the Trustee. Additional Bonds of the 3.25% Series due 2049 may be issued, at the option of the Company, without the consent of any holder of the Bonds of the 3.25% Series due 2049, at any time
and from time to time in unlimited aggregate principal amount. 

  
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 To the extent permitted by, and as provided in the Indenture, modifications or alterations
of the Indenture or of any indenture supplemental thereto, and of the rights and obligations of the Company and of the holders of the Bonds and coupons, may be made with the consent of the Company by an affirmative vote of not less than 60% in
principal amount of the Bonds entitled to vote then outstanding, at a meeting of holders of the Bonds called and held as provided in the Indenture, and by an affirmative vote of not less than 60% in principal amount of the Bonds of any series
entitled to vote then outstanding and affected by such modification or alteration, in case one or more but less than all of the series of Bonds then outstanding under the Indenture are so affected. No modification or alteration shall be made which
will affect the terms of payment of the principal of or premium, if any, or interest on, this Bond, which are unconditional. The Company has reserved the right to make certain amendments to the Indenture, without any consent or other action by
holders of the Bonds of this series (i) to the extent necessary from time to time to qualify the Indenture under the Trust Indenture Act of 1939, (ii) to delete the requirement that the Company meet a net earnings test as a condition to
authenticating additional Bonds or merging into another company, (iii) to make certain other amendments which make the provisions for the release of mortgaged property less restrictive and (iv) to make certain other amendments, all as more
fully provided in the Indenture and in the Supplemental Indenture. In addition, once all Bonds issued prior to January 1, 1997 are no longer outstanding, the Company will be permitted to issue additional Bonds in an amount equal to 70% of the
value of net bondable property additions not subject to an unfunded prior lien, as provided in the Original Mortgage. 
 This Bond is
subject to redemption by the Company, at its option, on or after March 1, 2049 (the “Par Call Date”) at any time, in whole or from time to time in part, at a redemption price equal to 100% of the principal amount of the Bond to
be redeemed, plus accrued and unpaid interest on the principal amount of the Bond to be redeemed to, but excluding, the redemption date. 

This Bond is subject to redemption by the Company prior to the Par Call Date at any time, in whole or from time to time in part, at a price
equal to the greater of: (a) 100% of the principal amount of the Bond to be redeemed, plus accrued and unpaid interest on the principal amount of the Bond to be redeemed to but excluding the redemption date; and (b) as determined by the
Quotation Agent, the sum of the present values of the remaining scheduled payments of principal and interest on the Bond to be redeemed that would be due if the Bond matured on the Par Call Date (not including any portion of payments of interest
accrued as of the redemption date) discounted to the redemption date on a semi-annual basis at the Adjusted Treasury Rate plus twenty (20) basis points, plus accrued and unpaid interest on the principal amount of the Bond to be redeemed to, but
excluding, the redemption date, in each of cases (a) and (b) as provided in the Supplemental Indenture. 

  
 13 

 Such redemption in every case shall be effected upon notice given: (1) at least ten
days and not more than sixty days prior to the redemption date, to the registered owners of such Bonds at their addresses as the same shall appear on the transfer register of the Company; and (2) stating, among other things, the redemption
price (or if not then ascertainable, the manner of calculation thereof) and date, in each case, subject to the conditions of and as more fully set forth in the Indenture. 

Notwithstanding the foregoing, so long as there is no existing default in the payment on the Bonds of the 3.25% Series due 2049, installments
of interest on the Bonds of the 3.25% Series due 2049 that are due and payable on an interest payment date falling on or prior to a redemption date shall be payable on such interest payment date to the registered owners of the Bonds of the 3.25%
Series due 2049 as of the close of business on the relevant record date according to the Bonds of the 3.25% Series due 2049 and the Indenture, except as and to the extent the Company shall default in the payment of the interest due on such interest
payment date, in which case defaulted interest shall be paid to the person in whose name such Bond of the 3.25% Series due 2049 is registered on the date of payment of such defaulted interest. The redemption price will be calculated assuming a 360-day year consisting of twelve 30-day months. 
 A notice of
redemption may provide that the optional redemption described in such notice is conditioned upon the occurrence of certain events before the redemption date. Such notice of conditional redemption will be of no effect unless all such conditions to
the redemption have occurred before the redemption date or have been waived by the Company. If any of these events fail to occur and are not waived by the Company, the Company will be under no obligation to redeem the Bonds or pay the holders
thereof any redemption proceeds, and the Company’s failure to so redeem the Bonds will not be considered a default or event of default under the Indenture. In the event that any of these conditions fail to occur and are not waived by the
Company, the Company will promptly notify the Trustee in writing that the conditions precedent to such redemption have failed to occur and the Bonds will not be redeemed. 

Unless the Company defaults in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the Bonds
or portions of the Bonds called for redemption. 
 “Adjusted Treasury Rate” means, with respect to any redemption date, the
rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for
the redemption date. 

  
 14 

 “Business Day” means any day that is not a day on which banking
institutions in New York City are authorized or required by law or regulation to close. 
 “Comparable Treasury Issue”
means the United States Treasury security selected by the Quotation Agent as having a maturity comparable to the remaining term of this Bond (assuming, for this purpose, that this Bond matured on the Par Call Date) that would be used, at the time of
selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of this Bond (assuming, for this purpose, that this Bond matured on the Par Call Date).

 “Comparable Treasury Price” means, with respect to any redemption date: 

 

	 	•	 	 the average of the Reference Treasury Dealer Quotations for that redemption date, after excluding the highest and
lowest of such Reference Treasury Dealer Quotations; or 

  

	 	•	 	 if the Quotation Agent obtains fewer than four of such Reference Treasury Dealer Quotations, the average of all
Reference Treasury Dealer Quotations so received. 

 “Quotation Agent” means, as selected by the Company,
one of the Reference Treasury Dealers. 
 “Reference Treasury Dealer” means each of (1) Barclays Capital Inc. and TD
Securities (USA) LLC and their respective affiliates or successors, unless any of the foregoing ceases to be a primary U.S. Government securities dealer in the United States (a “Primary Treasury Dealer”), in which case the Company
shall substitute another Primary Treasury Dealer; (2) a Primary Treasury Dealer selected by U.S. Bancorp Investments, Inc.; and (3) one other Primary Treasury Dealer selected by the Company. 

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the
average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by that Reference Treasury Dealer
at 5:00 p.m., New York City time, on the third Business Day preceding that redemption date. 
 In case an event of default, as defined in
the Indenture, shall occur, the principal of all of the Bonds at any such time outstanding under the Indenture may be declared or may become due and payable, upon the conditions and in the manner and with the effect provided in the Indenture. The
Indenture provides that such declaration may in certain events be waived by the holders of a majority in principal amount of the Bonds outstanding. 

  
 15 

 This Bond is transferable by the registered owner hereof, in person or by duly authorized
attorney, on the books of the Company to be kept for that purpose at the agency of the Company in the City of Chicago, Illinois, and at the agency of the Company in the Borough of Manhattan, The City of New York, upon surrender and cancellation of
this Bond and on presentation of a duly executed written instrument of transfer, and thereupon a new registered Bond or Bonds of the same series, of the same aggregate principal amount and in authorized denominations will be issued to the transferee
or transferees in exchange herefor; and this Bond, with or without others of like form and series, may in like manner be exchanged for one or more new registered Bonds of the same series of other authorized denominations but of the same aggregate
principal amount; all upon payment of the charges and subject to the terms and conditions set forth in the Indenture. 
 The Company or a
successor entity may deliver to the Trustee in substitution for any Bonds of the 3.25% Series due 2049, mortgage bonds or other similar instruments as set forth in the Indenture. 

Subject to the preceding sentence, no recourse shall be had for the payment of the principal of or premium, if any, or interest on this Bond,
or for any claim based hereon or on the Indenture or any indenture supplemental thereto, against any incorporator, or against any stockholder, director or officer, past, present or future, of the Company, or of any predecessor or successor
corporation, as such, either directly or through the Company or any such predecessor or successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, all such
liability, whether at common law, in equity, by any constitution, statute or otherwise, of incorporators, stockholders, directors or officers being released by every owner hereof by the acceptance of this Bond and as part of the consideration for
the issue hereof, and being likewise released by the terms of the Indenture. 
 No director, officer, employee or stockholder of the Company
will have any liability for any obligations of the Company under the Bonds or Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each holder by accepting a Bond waives and releases all such
liability. The waiver and release are part of the consideration for issuance of the Bonds. The waiver may not be effective to waive liabilities under the federal securities laws. It is the view of the Securities and Exchange Commission that this
type of waiver is against public policy. 
 This Bond shall not be entitled to any benefit under the Indenture or any indenture supplemental
thereto, or become valid or obligatory for any purpose, until The Bank of New York Mellon Trust Company, N.A., the Trustee (as successor to Harris Trust and Savings Bank) under the Indenture, or a successor trustee thereto under the Indenture, shall
have signed the form of certificate endorsed hereon. 

  
 16 

 IN WITNESS WHEREOF, WESTAR ENERGY, INC. has caused this Bond to be signed in its name by its
Chairman of the Board, President and Chief Executive Officer or a Vice President, manually or by facsimile, and its corporate seal (or a facsimile thereof) to be hereto affixed and attested by its Secretary or an Assistant Secretary, manually or by
facsimile. 
 Dated: 
  

	
	WESTAR ENERGY, INC.
	
	By:
	
	   

	Lori A. Wright
	Vice President, Corporate Planning,
	Investor Relations and Treasurer

  

	
	Attest:
	
	   

	Heather A. Humphrey
	Senior Vice President, General Counsel and Corporate Secretary

 [SIGNATURE PAGE TO GLOBAL NOTE] 

  
 17 

 TRUSTEE’S CERTIFICATE 

This Bond is one of the Bonds, of the series designated herein, described in the within-mentioned Mortgage and Deed of Trust dated
July 1, 1939 and Supplemental Indenture dated as of August 19, 2019. 
  

	
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.
	 As Trustee

	
	By:
	
	   

	Authorized Signatory

 [TRUSTEE’S CERTIFICATE TO GLOBAL NOTE] 

  
 18 

 Section 4. Execution and Form of Temporary Bonds of the
3.25% Series due 2049. Until Bonds of the 3.25% Series due 2049 in definitive form are ready for delivery, the Company may execute, and upon its request in writing the Trustee shall authenticate and deliver, in lieu thereof, Bonds of the 3.25%
Series due 2049 in temporary form, as provided in Section 9 of Article II of the Original Indenture. 
 ARTICLE II 

ISSUE OF BONDS OF THE 3.25% SERIES DUE
2049 
 Section 1. Limitation as to Principal Amount of Bonds of the 3.25% Series due 2049.
The total principal amount of Bonds of the 3.25% Series due 2049 which may be authenticated and delivered hereunder is not limited except as the Original Indenture and this Supplemental Indenture limit the principal amount of Bonds which may be
issued thereunder. 
 Section 2. Execution and Delivery of Bonds of the 3.25% Series due 2049.
Bonds of the 3.25% Series due 2049 for the aggregate principal amount of $300,000,000 may forthwith be executed by the Company and delivered to the Trustee and shall be authenticated by the Trustee and delivered (either before or after the
filing or recording hereof) to or upon the order of the Company, upon receipt by the Trustee of the resolutions, certificates, instruments and opinions required by Article III of the Original Indenture. 

Section 3. Additional Bonds of the 3.25% Series due 2049. The Bonds of the 3.25% Series due 2049 need not be
issued at the same time. Subject to the limitations of the Original Indenture and this Supplemental Indenture with respect to the principal amount of Bonds which may be issued thereunder, the Company may, from time to time, at its option and without
the consent of any holder of the Bonds of the 3.25% Series due 2049, reopen the 3.25% Series due 2049 for issuance of additional Bonds of the 3.25% Series due 2049 (such Bonds, “Additional Bonds”); provided that if the
Additional Bonds are not fungible with the previously issued Bonds of the 3.25% Series due 2049 for United States federal income tax purposes, the Additional Bonds will have a separate CUSIP number, and further provided that Additional Bonds
shall rank pari passu with any outstanding Bonds of the 3.25% Series due 2049, shall be consolidated with and treated as a single series with the outstanding Bonds of the 3.25% Series due 2049 for all purposes, and shall have terms and
conditions identical to those of the other outstanding Bonds of the 3.25% Series due 2049, except that Additional Bonds may differ with respect to: 

(i) the date of issuance; 
 (ii)
the amount of interest payable on the first interest payment date therefor; 
 (iii) the first interest payment date; 

  
 19 

 (iv) the issue price; and 

(v) any adjustments necessary in order to conform to and ensure compliance with the Securities Act of 1933 (or other applicable securities
laws), which are not adverse in any material respect to the holder of any outstanding Bonds of the 3.25% Series due 2049. 
 Additional
Bonds of the 3.25% Series due 2049 executed by the Company and delivered to the Trustee shall be authenticated by the Trustee and delivered (either before or after the filing or recording hereof) to or upon the order of the Company, upon receipt by
the Trustee of the resolutions, certificates, instruments and opinions required by Article III of the Original Indenture. 
 ARTICLE III 

REDEMPTION AND SUBSTITUTION OF BONDS OF
THE 3.25% SERIES DUE 2049 
 Section 1. Optional Redemption of
Bonds of the 3.25% Series due 2049.  
 (1) Optional Redemption of Bonds of the 3.25% Series due 2049. Prior
to March 1, 2049 (the “Par Call Date”), the Company may, at its option, redeem the Bonds of the 3.25% Series due 2049 at any time, in whole or from time to time in part, after giving the required notice under subsection
(2) of this Article III, Section 1, at a redemption price equal to the greater of: (a) 100% of the principal amount of the Bonds of the 3.25% Series due 2049 to be redeemed, plus accrued and unpaid interest on Bonds of the 3.25% Series due
2049 to be redeemed to, but excluding, the redemption date; and (b) as determined by the Quotation Agent, the sum of the present values of the remaining scheduled payments of principal and interest on the Bonds of the 3.25% Series due 2049 to
be redeemed that would be due if such Bonds matured on the Par Call Date (not including any portion of payments of interest accrued as of the redemption date) discounted to the redemption date on a semi-annual basis at the Adjusted Treasury Rate
plus twenty (20) basis points, plus accrued and unpaid interest on those Bonds of the 3.25% Series due 2049 to be redeemed to, but excluding, the redemption date. 

On or after the Par Call Date, the Company may, at its option, redeem the Bonds of the 3.25% Series due 2049 at any time, in whole or from
time to time in part, after giving the required notice under subsection (2) of this Article III, Section 1, at a redemption price equal to 100% of the principal amount of the Bonds to be redeemed, plus accrued and unpaid interest on the
Bonds to be redeemed to, but excluding, the redemption date. 
 Notwithstanding the foregoing, so long as there is no existing default in
the payment on the Bonds of the 3.25% Series due 2049, installments of interest on the Bonds of the 3.25% Series due 2049 that are due and payable on an interest payment date falling on or prior to a redemption date shall be payable on such interest
payment date to the registered owners of the Bonds of the 3.25% Series due 2049 as of the close of business on the relevant record date according to the 

  
 20 

 
Bonds of the 3.25% Series due 2049 and the Indenture, except as and to the extent the Company shall default in the payment of the interest due on such interest payment date, in which case
defaulted interest shall be paid to the person in whose name such Bond of the 3.25% Series due 2049 is registered on the date of payment of such defaulted interest. The redemption price will be calculated assuming a
360-day year consisting of twelve 30-day months. 
 Unless
the Company defaults in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the Bonds of the 3.25% Series due 2049 or portions of the Bonds of the 3.25% Series due 2049 called for redemption. 

(2) Notice of Redemption. Subject to the provisions of Article V of the Original Indenture, in the case of redeeming all or any portion
of the Bonds of the 3.25% Series due 2049, the Company shall cause notice of redemption to be given (1) at least ten days and not more than sixty days prior to the date of redemption, to the registered owners of such Bonds of the 3.25% Series
due 2049 at their addresses as the same shall appear on the transfer register of the Company; and (2) stating, among other things, the redemption price (or if not then ascertainable, the manner of calculation thereof) and date. 

Notwithstanding the foregoing, a notice of redemption may provide that the optional redemption described in such notice is conditioned upon
the occurrence of certain events before the date of redemption. Such notice of conditional redemption will be of no effect unless all such conditions to the redemption shall have occurred before the redemption date or shall have been waived by the
Company. If any of these events fail to occur and are not waived by the Company, the Company will be under no obligation to redeem the Bonds of the 3.25% Series due 2049 or pay the holders thereof any redemption proceeds and the Company’s
failure to so redeem the Bonds of the 3.25% Series due 2049 will not be considered a default or event of default under the Indenture. In the event that any of these conditions fail to occur or are not waived by the Company, the Company will promptly
notify the Trustee in writing that the conditions precedent to such redemption have failed to occur and the Bonds of the 3.25% Series due 2049 will not be redeemed. 

“Adjusted Treasury Rate” means, with respect to any redemption date, the rate per annum equal to the semi-annual equivalent
yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for the redemption date. 

“Business Day” means any day that is not a day on which banking institutions in New York City are authorized or required by
law or regulation to close. 

  
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 “Comparable Treasury Issue” means the United States Treasury security
selected by the Quotation Agent as having a maturity comparable to the remaining term of the Bonds of the 3.25% Series due 2049 (assuming, for this purpose, that the Bonds of the 3.25% Series due 2049 matured on the Par Call Date) that would be
used, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Bonds of the 3.25% Series due 2049 (assuming, for this
purpose, that the Bonds of the 3.25% Series due 2049 matured on the Par Call Date). 
 “Comparable Treasury Price” means,
with respect to any redemption date: 
  

	 	•	 	 the average of the Reference Treasury Dealer Quotations for that redemption date, after excluding the highest and
lowest of such Reference Treasury Dealer Quotations; or 

  

	 	•	 	 if the Quotation Agent obtains fewer than four of such Reference Treasury Dealer Quotations, the average of all
Reference Treasury Dealer Quotations so received. 

 “Quotation Agent” means, as selected by the Company,
one of the Reference Treasury Dealers. 
 “Reference Treasury Dealer” means each of (1) Barclays Capital Inc. and TD
Securities (USA) LLC and their respective affiliates or successors, unless any of the foregoing ceases to be a primary U.S. Government securities dealer in the United States (a “Primary Treasury Dealer”), in which case the Company
shall substitute another Primary Treasury Dealer; (2) a Primary Treasury Dealer selected by U.S. Bancorp Investments, Inc.; and (3) one other Primary Treasury Dealer selected by the Company. 

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the
average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by that Reference Treasury Dealer
at 5:00 p.m., New York City time, on the third Business Day preceding that redemption date. 
 In connection with any redemption of the
Bonds of the 3.25% Series due 2049 occurring prior to the Par Call Date, the Company shall give the Trustee notice of the redemption price promptly after the calculation thereof and the Trustee shall not be responsible for such calculation. 

  
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 Section 2. Substitution of Bonds of the 3.25% Series due
2049. The Company may deliver to the Trustee in substitution for any Bonds of the 3.25% Series due 2049, mortgage bonds or other similar secured instruments of the Company or any successor entity, whether by merger, combination or
acquisition of all or substantially all of the assets of the Company, or otherwise, issued under a mortgage and deed of trust or similar instrument of the Company or any successor entity in like principal amount of like term and bearing the same
rate of interest and having the same interest payment dates and same redemption provisions as the Bonds of the 3.25% Series due 2049 and which are otherwise substantially similar to the Bonds of the 3.25% Series due 2049 (such substituted bonds
hereinafter being referred to in this Article III, Section 2 as the “3.25% Series due 2049 Substituted Mortgage Bonds”). The 3.25% Series due 2049 Substituted Mortgage Bonds may only be delivered to the Trustee upon receipt by
the Trustee of (i) a letter from Moody’s (as hereinafter defined), dated within ten days prior to the date of delivery of the 3.25% Series due 2049 Substituted Mortgage Bonds, stating that its rating of the 3.25% Series due 2049
Substituted Mortgage Bonds is at least equal to its then current rating on the Bonds of the 3.25% Series due 2049, (ii) a letter from S&P (as hereinafter defined), dated within ten days prior to the date of delivery of the 3.25% Series due 2049
Substituted Mortgage Bonds, stating that its rating to the 3.25% Series due 2049 Substituted Mortgage Bonds is at least equal to its then current rating on the Bonds of the 3.25% Series due 2049, (iii) an opinion of counsel, which may be counsel to
the Company or any successor entity, that such substitution will not result in the recognition of capital gain or loss for U.S. federal income tax purposes to the holders of the Bonds of the 3.25% Series due 2049, (iv) an opinion of counsel which
may be counsel to the Company or any successor entity, to the effect that the 3.25% Series due 2049 Substituted Mortgage Bonds shall have been duly and validly authorized, executed, authenticated, and delivered and shall constitute the valid,
legally binding and enforceable obligations of the Company or any successor entity enforceable in accordance with their terms, except as limited by bankruptcy, insolvency or other laws affecting the enforcement of mortgagees’ and other
creditors’ rights and shall be entitled to the benefit of the mortgage and deed of trust or other similar instrument pursuant to which they shall have been issued and (v) such other certificates and documents with respect to the issuance
and delivery of the 3.25% Series due 2049 Substituted Mortgage Bonds as may be required by law or as the Trustee may reasonably request. 

“Moody’s” means Moody’s Investors Service, Inc., a corporation organized and existing under the laws of the State
of Delaware, its successors and their assigns, except that if such corporation shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, then the term “Moody’s” shall be deemed to refer
to any other nationally recognized securities rating agency selected by the Company. 
 “S&P” means S&P Global
Ratings, duly organized and existing under and by virtue of the laws of the State of New York, and its successors and assigns, except that if such rating agency shall be dissolved or liquidated or shall no longer perform the functions of a
securities rating agency, then the term “S&P” shall be deemed to refer to any other nationally recognized securities rating agency selected by the Company. 

  
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 ARTICLE IV 

ADDITIONAL COVENANTS 

The Company hereby covenants, warrants and agrees: 

Section 1. Title to Mortgaged Property. That the Company is lawfully seized and possessed of all of
the mortgaged property described in the granting clauses of this Supplemental Indenture; that it has good, right and lawful authority to mortgage the same as provided in this Supplemental Indenture; and that such mortgaged property is, at the actual
date of the initial issue of the Bonds of the 3.25% Series due 2049 and at the date of issuance of any Additional Bonds, as applicable, free and clear of any deed of trust, mortgage, lien, charge or encumbrance thereon or affecting the title thereto
prior to the Indenture, except as set forth in the granting clauses of the Original Indenture, the Thirty-Second Supplemental Indenture, the Thirty-Ninth Supplemental Indenture, the Forty-Second Supplemental Indenture, the Forty-Second Supplemental
(Reopening) Indenture, the Forty-Third Supplemental Indenture, the Forty-Fourth Supplemental Indenture, the Forty-Fifth Supplemental Indenture, the Forty-Sixth Supplemental Indenture, the Forty-Seventh Supplemental Indenture and this Supplemental
Indenture. 
 Section 2. To Retire Certain Portions of Bonds upon Release of All or Substantially All of the
Electric Properties. So long as any Bonds of any series originally issued prior to January 1, 1997 are outstanding, in the event all or substantially all of the electric properties shall have been released as an entirety from the
lien of the Original Indenture, the Company will, at any time or from time to time within six months after the date of such release, retire Bonds outstanding under the Original Indenture in an aggregate principal amount equal to the fair value of
the electric properties so released pursuant to Section 3 of Article VII of the Original Indenture, as stated in the engineer’s certificate required by Section 3(b) of said Article VII, and the proceeds of the electric
properties so released pursuant to Section 5 of said Article VII. Such retirement of Bonds shall be effected in either one or both of the following methods: 

(a) By the withdrawal pursuant to Section 2 of Article VIII of the Original Indenture of any moneys deposited with the Trustee
pursuant to Sections 3(d), 4(d) and 5 of Article VII of the Original Indenture upon such release; or 
 (b) By causing the Trustee to
purchase or redeem bonds, pursuant to Section 8 of Article VIII of the Original Indenture, out of any moneys deposited with the Trustee pursuant to Sections 3(d), 4(d) and 5 of Article VII of the Original Indenture upon such
release. 
 The Bonds to be so retired pursuant to such Section 3 of Article VII of the Original Indenture shall include a principal
amount of Bonds of each Series then outstanding in the same ratio to the aggregate principal amount of all Bonds so retired as the aggregate principal amount of all Bonds of each Series outstanding immediately prior to such release bears to the
total principal amount of all Bonds then outstanding. 

  
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 Section 3. The Bonds of the 3.25% Series due 2049 shall be subject to the following
provision: 
 The Company agrees (i) to provide the Trustee with such reasonable information as it has in its possession to enable
the Trustee to determine whether any payments pursuant to the Indenture are subject to the withholding requirements described in Section 1471(b) of the US Internal Revenue Code of 1986 (the “Code”) or otherwise imposed pursuant to
Sections 1471 through 1474 of the Code and any regulations, or agreements thereunder or official interpretations thereof (“Applicable Law”), and (ii) that the Trustee shall be entitled to make any withholding or deduction from
payments under the Indenture to the extent necessary to comply with Applicable Law, for which the Trustee shall not have any liability. 

ARTICLE V 

AMENDMENTS AND RESERVATIONS OF RIGHTS TO
AMEND THE ORIGINAL INDENTURE 

Section 1. So Long as Bonds Issued Prior to January 1, 1997 Remain Outstanding.
So long as any of the Bonds of any series originally issued prior to January 1, 1997 shall remain outstanding: 
 (a)
Notwithstanding the provisions of Section 4 of Article III of the Original Indenture, no Bonds shall be authenticated and delivered pursuant to the provisions of Article III of the Original Indenture and issued upon the basis of net bondable
value of property additions for an aggregate principal amount in excess of sixty percent (60%) of the net bondable value of property additions not subject to an unfunded prior lien. 

For the purposes of Subsections (e) and (f) of the definition of “net bondable value of property additions not subject to an
unfunded prior lien,” contained in Article I of the Original Indenture, and Subdivisions 8 and 9 of clause (a) of Section 4 of Article III of the Original Indenture, in all computations made with respect to a period subsequent to
April 1, 1949, the deductions therein referred to shall in each case be ten-sixths (10/6ths) of the respective amounts mentioned, in lieu of ten-sevenths (10/7ths).

 (b) Notwithstanding the provisions of Section 3(a) of Article VIII of the Original Indenture, no moneys received by the Trustee
pursuant to Section 5(a) of Article III of the Original Indenture shall be paid over by the Trustee in an amount in excess of sixty percent (60%) of the net bondable value of property additions not subject to an unfunded prior lien, and for the
purposes of Section 3 of Article VII of the Original Indenture, the amount of cash required to be deposited by the Company pursuant to Subsection (d) of said Section 3 of Article VII shall not be reduced in an amount in
excess of sixty percent (60%) of the net bondable value of property additions not subject to an unfunded prior lien. 

  
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 (c) For the purposes of clauses (c) and (d) of the definition of “net
bondable value of property additions subject to an unfunded prior lien,” contained in Article I of the Original Indenture, and Subsection 7 of clause (a) of Section 4 of Article III of the Original Indenture, in all computations made
with respect to a period subsequent to April 1, 1949, the deductions therein referred to shall in each case be ten-sixths (10/6ths) of the respective amounts mentioned, in lieu of ten-sevenths (10/7ths). 
 (d) Subsection (a) of Section 14, clauses (1) and (2) of
Subsection (a) of Section 16 of Article IV and clause (1) of Subsection (b) of Section 1 of Article XII of the Original Indenture shall be deemed amended by substituting the words “sixty percent (60%)” for
“seventy percent (70%)” where they appear in said provisions of the Original Indenture. 
 (e) The definition of the term
“net earnings available for interest, depreciation and property retirement,” as contained in Article I of the Original Indenture, shall be deemed to mean the net earnings of the Company ascertained as follows: 

(i) The total operating revenues of the Company and the net non-operating revenues of
the properties of the Company shall be ascertained: 
 (A) From the total, determined as provided in Subsection (a), there
shall be deducted all operating expenses, including all salaries, rentals, insurance, license and franchise fees, expenditures for repairs and maintenance, taxes (other than income, excess profits and other taxes measured by or dependent on net
taxable income), depreciation as shown on the books of the Company or an amount equal to the minimum provision for depreciation as hereinafter defined, whichever is greater, but excluding all property retirement appropriations, all interest and
sinking fund charges, amortization of stock and debt discount and expense or premium and further excluding any charges to income or otherwise for the amortization of plant or property accounts or of amounts transferred therefrom. 

(B) The balance remaining after the deduction of the total amount computed pursuant to Subsection (b) from the total
amount computed pursuant to Subsection (a) shall constitute the “net earnings of the Company available for interest,” provided that not more than fifteen percent (15%) of the net earnings of the Company available for interest
may consist of the aggregate of (1) net non-operating income, (2) net earnings from mortgaged property other than property of the character of property additions and (3) net earnings from
property not subject to the lien of this Indenture. 

  
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 (C) No income received or accrued by the Company from securities and no
profits or losses of capital assets shall be included in making the computations aforesaid. 
 (D) In case the Company shall
have acquired any acquired plant or systems or shall have been consolidated or merged with any other corporation, within or after the particular period for which the calculation of net earnings of the Company available for interest, depreciation and
property retirement is made, then, in computing the net earnings of the Company available for interest, depreciation and property retirement, there may be included, to the extent they may not have been otherwise included, the net earnings or net
losses of such acquired plant or system or of such other corporation, as the case may be, for the whole of such period. The net earnings or net losses of such property additions, or of such other corporation for the period preceding such acquisition
or such consolidation or merger, shall be ascertained and computed as provided in the foregoing subsections of this definition as if such acquired plant or system had been owned by the Company during the whole of such period, or as if such other
corporation had been consolidated or merged with the Company prior to the first day of such period. 
 (E) In case the
Company shall have obtained the release of any property pursuant to Section 3 of Article VII of the Original Indenture, of a fair value in excess of Five Hundred Thousand Dollars ($500,000), as shown by the engineer’s certificate
required by said Section 3, or shall have obtained the release of any property pursuant to Section 5 of Article VII of the Original Indenture, the proceeds of which shall have exceeded Five Hundred Thousand Dollars ($500,000), within
or after the particular period for which the calculation of net earnings of the Company available for interest, depreciation and property retirement is made, then, in computing the net earnings of the Company available for interest, depreciation and
property retirement, the net earnings or net losses of such property for the whole of such period shall be excluded to the extent practicable on the basis of actual earnings and expenses of such property or on the basis of such estimates of the
earnings and expenses of such property as the signers of an officers’ certificate filed with the Trustee pursuant to Section 3(b) of Article III or Section 16 of Article IV of the Original Indenture shall deem proper. 

  
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 (ii) The term “minimum charge for depreciation” as used
herein shall mean an amount equal to (A) fifteen percent (15%) of the total operating revenues of the Company after deducting therefrom an amount equal to the aggregate cost to the Company of electric energy, gas and water purchased for resale
to others and rentals paid for, or other payments made for the use of, property owned by others and leased to or operated by the Company, the maintenance of which and depreciation on which are borne by the owners, less (B) an amount equal to
the expenditures for maintenance and repairs to the plants and property of the Company and included or reflected in its operating expense accounts. 

(iii) The terms “net earnings available for interest, depreciation and property retirement” and “net
earnings of another corporation available for interest, depreciation and property retirement” as contained in Article I of the Original Indenture, when used with respect to any property or with respect to another corporation, shall mean the
net earnings of such property or the net earnings of such other corporation, as the case may be, computed in the manner provided in Subsections (a), (b), (c) and (d) hereof. 

(f) Notwithstanding the provisions of clauses (1) and (2) of Subsection (b) of Section 3 of Article III, and
Subsection (b) of Section 14 of Article IV, and Subsection (b) of Section 16 of Article IV and clause (2) of Subsection (b) of Section 1 of Article XII of the Original Indenture, the computation of net
earnings required therein shall be made as provided in Subsection (e) of this Section 1, and the net earnings tests required in said mentioned provisions of Articles III, IV and XII of the Original Indenture shall be based on two times the
annual interest charges described in such provisions, instead of two and one-half times such charges, but shall not otherwise affect such provisions or relieve from the requirements therein pertaining to ten
percent (10%) of the principal amount of Bonds therein described. 
 Section 2. Facsimile Signatures.
All of the Bonds of the 3.25% Series due 2049 and of any series initially issued after the initial issuance of Bonds of the 3.25% Series due 2049 shall, from time to time, be executed on behalf of the Company by its Chairman of the Board, Chief
Executive Officer, President or one of its Vice Presidents whose signature, notwithstanding the provisions of Section 12 of Article II of the Original Indenture, may be by facsimile, and its corporate seal (which may be in facsimile) shall be
thereunto affixed and attested by its Secretary or one of its Assistant Secretaries whose signature, notwithstanding the provisions of the aforesaid Section 12, may be by facsimile. 

In case any of the officers who have signed or sealed any of the Bonds of the 3.25% Series due 2049 or of any series initially issued after
the initial issuance of Bonds of the 3.25% Series due 2049 manually or by facsimile shall cease to be such officers of the Company before such Bonds so signed and sealed shall have been actually authenticated by the Trustee or delivered by the
Company, such 

  
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Bonds nevertheless may be authenticated, issued and delivered with the same force and effect as though the person or persons who so signed or sealed such Bonds had not ceased to be such officer
or officers of the Company; and also any such Bonds may be signed or sealed by manual or facsimile signature on behalf of the Company by such persons as at the actual date of the execution of any of such Bonds shall be the proper officers of the
Company, although at the nominal date of any such Bond any such person shall not have been such officer of the Company. 

Section 3. Reservation of Right to Amend Article VII. The Company reserves the right subject to
appropriate corporate action, but without the consent or other action of holders of bonds of any series created after January 1, 1997, to make such amendments to the Original Indenture, as supplemented, as shall be necessary in order to amend
Article VII thereof by adding thereto a Section 8 and a Section 9 to read as follows: 
 “SECTION 8.
Notwithstanding any other provision of this Indenture, unless an event of default shall have happened and be continuing, or shall happen as a result of the making or granting of an application to release mortgaged property permitted by this
Section 8, the Trustee shall release from the lien of this Indenture any mortgaged property if the fair value to the Company of all of the property constituting the trust estate (excluding the mortgaged property to be released but including any
mortgaged property to be acquired by the Company with the proceeds of, or otherwise in connection with, such release) equals or exceeds an amount equal to 10/7ths of the aggregate principal amount of outstanding Bonds and prior lien bonds
outstanding at the time of such release, upon receipt by the Trustee of: 
 “(a) an officers’ certificate dated the
date of such release, requesting such release, describing in reasonable detail the mortgaged property to be released and stating the reason for such release; 

“(b) an engineer’s certificate, dated the date of such release, stating (i) that the signer of such
engineer’s certificate has examined such officers’ certificate in connection with such release, (ii) the fair value to the Company, in the opinion of the signer of such engineer’s certificate, of (A) all of the property
constituting the trust estate, and (B) the mortgaged property to be released, in each case as of a date not more than 90 days prior to the date of such release, and (iii) that in the opinion of such signer, such release will not impair the
security under this Indenture in contravention of the provisions hereof; 

  
 29 

 “(c) in case any bondable property is being acquired by the Company
with the proceeds of, or otherwise in connection with, such release, an engineer’s certificate, dated the date of such release, as to the fair value to the Company, as of the date not more than 90 days prior to the date of such release, of the
bondable property being so acquired (and if within six months prior to the date of acquisition by the Company of the bondable property being so acquired, such bondable property has been used or operated by a person or persons other than the Company
in a business similar to that in which it has been or is to be used or operated by the Company, and the fair value to the Company of such bondable property, as set forth in such certificate, is not less than $25,000 and not less than 1% of the
aggregate principal amount of Bonds at the time outstanding, such certificate shall be an independent appraiser’s certificate); 

“(d) an officer’s certificate, dated the date of such release, stating the aggregate principal amount of outstanding
Bonds and prior lien bonds outstanding at the time of such release, and stating that the fair value to the Company of all of the property constituting the trust estate (excluding the mortgaged property to be released but including any bondable
property to be acquired by the Company with the proceeds of, or otherwise in connection with, such release) stated on the independent appraiser’s certificate filed pursuant to Section 8(c) equals or exceeds an amount equal to 10/7ths of
such aggregate principal amount; 
 “(e) an officers’ certificate, dated the date of such release, stating that,
the Company is not, and by the making or granting of the application will not be, in default in the performance of any of the terms and covenants of this Indenture; and 

“(f) an opinion of counsel, dated the date of such release, as to compliance with conditions precedent. 

“SECTION 9. If the Company is unable to obtain, in accordance with any other Section of this Article VII, the release from
the lien of this Indenture of any property constituting part of the trust estate, unless an event of default shall have happened and be continuing, or shall happen as a result of the making or granting of an application to release mortgaged property
permitted by this Section 9, the Trustee shall release from the lien of this Indenture any mortgaged property if the fair value to the Company thereof, as shown by the engineer’s certificate filed pursuant to Section 9(b), is less
than 1/2 of 1% of the aggregate principal amount of outstanding Bonds and prior lien bonds outstanding at the time of such release, provided that the aggregate fair value to the Company of all mortgaged property released pursuant to this
Section 9, as shown by all engineer’s certificates filed pursuant to Section 9(b) in any period of 12 consecutive calendar months which includes the date of such engineer’s certificate, shall not exceed 1% of the aggregate
principal amount of the 

  
 30 

 
outstanding Bonds and prior lien bonds outstanding at the time of such release, upon receipt by the Trustee of: 

“(a) an officers’ certificate, dated the date of such release, requesting such release, describing in reasonable
detail the mortgaged property to be released and stating the reason for such release; 
 “(b) an engineer’s
certificate, dated the date of such release, stating (A) that the signer of such engineer’s certificate has examined such officers’ certificate in connection with such release, (B) the fair value to the Company, in the opinion of
the signer of such engineer’s certificate, of such mortgaged property to be released as of a date not more than 90 days prior to the date of such release, and (C) that in the opinion of such signer such release will not impair the security
under this Indenture in contravention of the provisions hereof; 
 “(c) an officers’ certificate, dated the date of
such release, stating the aggregate principal amount of outstanding Bonds and prior lien bonds outstanding at the time of such release, that 1/2 of 1% of such aggregate principal amount does not exceed the fair value to the Company of the mortgaged
property for which such release is applied for as shown by the engineer’s certificate referred to in Section 9(b), and that 1% of such aggregate principal amount does not exceed the aggregate fair value to the Company of all mortgaged
property released from the lien of this Indenture pursuant to this Section 9 as shown by all engineer’s certificates filed pursuant to Section 9(b) in such period of 12 consecutive calendar months; 

“(d) an officers’ certificate, dated the date of such release, stating that, the Company is not, and by the making or
granting of the application will not be, in default in the performance of any of the terms and covenants of this Indenture; and 

“(e) an opinion of counsel, dated the date of such release, as to compliance with conditions precedent.” 

The Company also reserves the right subject to appropriate corporate action, but without the consent or other action of holders of Bonds of
any series created after January 1, 1997 to amend, modify or delete any other provision of the Original Indenture, as supplemented, as may be necessary in order to effectuate the intents and purposes contemplated by the foregoing Sections 8 and
9. 

  
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 Section 4. Reservation of Right to Delete Certain
Requirements and Conditions. The Company reserves the right subject to appropriate corporate action, but without the consent or other action of holders of Bonds of any series created after January 1, 1997 to: 

(a) delete as a condition to the authentication of additional Bonds pursuant to Sections 4, 5 or 6 of Article III of the Original Indenture the
requirement to file or deposit with the Trustee the officers’ certificate described in Section 3(b) of Article III of the Original Indenture; 

(b) delete as a condition to the consolidation or merger of the Company into, or sale by the Company of its property as an entirety or
substantially as an entirety to another corporation the requirement set forth in Section 1(b)(2) of Article XII of the Original Indenture; 

(c) delete as a condition to the release of property pursuant to Section 3 of Article VII of the Original Indenture, the requirement to
obtain an independent engineer’s certificate under the circumstances set forth in Section 3(c) of Article VII; and 
 (d) amend,
modify or delete any other provision of the Original Indenture, as supplemented, as may be necessary in order to effectuate the intents and purposes contemplated by this Section 4. 

Section 5. Issuance of Variable Rate Bonds. The Company reserves the right, subject to appropriate
action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to clarify the ability of the Company to issue variable rate bonds under the Original Indenture, notwithstanding
any provision of the Original Indenture to the contrary. The Company may make such other amendments to the Original Indenture as may be necessary or desirable in the opinion of the Company to effect the foregoing. 

Section 6. Substitution of Bonds. The Company reserves the right, subject to appropriate action,
but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture as may be necessary in order to permit the Company to deliver to the Trustee in
substitution for any bonds issued under the Original Indenture (except Bonds of the 3.25% Series due 2049, which are subject to Article III, Section 2 hereof), mortgage bonds or other similar instruments of the Company or any successor entity,
whether by merger, combination or acquisition of all or substantially all of the assets of the Company, or otherwise, issued under a mortgage and deed of trust or similar instrument of the Company or any successor entity in like principal amount of
like term and bearing the same rate of interest as the original bonds (such substituted bonds hereinafter being referred to as the “Substituted Mortgage Bonds”). The Substituted Mortgage Bonds may only be delivered to the Trustee
upon receipt by the Trustee of (i) if the original bonds were rated by Moody’s, a letter from Moody’s, dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating of the

  
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Substituted Mortgage Bonds is at least equal to its then current rating on the original bonds, (ii) if the original bonds were rated by S&P, a letter from S&P, dated within ten days
prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating to the Substituted Mortgage Bonds is at least equal to its then current rating on the original bonds, (iii) an opinion of counsel which may be counsel to
the Company or any successor entity, to the effect that the Substituted Mortgage Bonds shall have been duly and validly authorized, executed, authenticated, and delivered and shall constitute the valid, legally binding and enforceable obligations of
the Company or any successor entity enforceable in accordance with their terms, except as limited by bankruptcy, insolvency or other laws affecting the enforcement of mortgagees’ and other creditors’ rights and shall be entitled to the
benefit of the mortgage and deed of trust or other similar instrument pursuant to which they shall have been issued and (iv) such other certificates and documents with respect to the issuance and delivery of the Substituted Mortgage Bonds as
may be required by law or as the Trustee may reasonably request. The Company may make such other amendments to the Original Indenture as may be necessary or desirable in the opinion of the Company to effect the foregoing. 

Section 7. Addition of a Governing Law Clause. The Company reserves the right, subject to
appropriate action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture to add the following new section: 

“This Indenture shall be deemed to be a contract made under the laws of the State of Kansas and for all purposes shall be
construed in accordance with the laws of the State of Kansas, without regard to conflicts of laws principles thereof.” 

Section 8. Event of Default for Failure to Pay Final Judgments in Excess of $100,000. The Company
reserves the right, subject to appropriate action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture to delete Article IX,
Section 1(j). The Company may make such other amendments to the Original Indenture as may be necessary or desirable in the opinion of the Company to effect the foregoing. 

Section 9. Net Earnings Test in Connection with Property Acquisitions. The Company reserves the
right, subject to appropriate action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture to delete Article IV, Section 14(b) and
reserves the right to further amend, modify or delete any other provision of the Original Indenture, as supplemented, as may be necessary in order to effectuate the intents and purposes contemplated by this Section 9. 

  
 33 

 Section 10. Addition of Nuclear Fuel. The Company
reserves the right, subject to appropriate action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture to (i) add Nuclear Fuel to the
definition of “Property Additions”; provided that there shall be no restrictions under the Original Indenture on the application of any controls, liens, regulations, easements, restrictions, exceptions or reservations by any
governmental authority on the Nuclear Fuel, (ii) to allow the Company to at any time, unless the Company is in default in the payment of the interest on any of the bonds then outstanding or there is an ongoing event of default without any
release or consent by, or report to, the Trustee, sell or otherwise dispose of, free from the lien of the Original Indenture, any Nuclear Fuel which shall have become old, inadequate, obsolete, worn out, unfit, unadapted, unserviceable, undesirable
or unnecessary for use in the operations of the Company upon the replacement or substitution of such Nuclear Fuel with other Nuclear Fuel of at least equal value and subject to the lien of the Original Indenture and (iii) to further amend,
modify or delete any other provision of the Original Indenture, as supplemented, as may be necessary in order to effectuate the intents and purposes contemplated by this Section 10. 

The term ‘Nuclear Fuel’ shall mean (a) any fuel element, including nuclear fuel and associated means (and any similar or
analogous device or substance), whether or not classified as fuel and whether or not chargeable to operating expenses, comprising or intended to comprise, or formerly comprising, the core, or other part, of a nuclear reactor or any similar or
analogous device, (b) any fuel element, including nuclear fuel, and associated means (and any similar or analogous device or substance) while in the process of fabrication or preparation and special nuclear or other materials held for use in
such fabrication or preparation, (c) any substances or materials formerly comprising such nuclear fuel and associated means (or any similar or analogous device or substance) and which substances or materials are undergoing or have undergone
reprocessing and (d) uranium, thorium, plutonium, and any other substance or material from time to time used or selected for use by the Company as fuel material, or as potential fuel material, in a nuclear reactor or any similar or analogous
device. 
 Section 11. Modernization of the Original Indenture. The Company reserves the right,
subject to appropriate action, but without any consent or other action by holders of Bonds of the 3.25% Series due 2049, or of any subsequent series of bonds, to amend the Original Indenture to: 

(i) Eliminate maintenance and improvement fund requirements; 

(ii) Simplify the provisions for release of obsolete property, de minimis property releases and substitution of property and
unfunded property; 
 (iii) Permit additional terms of bonds or forms of bond in supplemental indentures, including terms for
uncertificated and global securities (or definitive securities in lieu thereof) and medium-term notes; 

  
 34 

 (iv) Make any changes necessary to conform the Mortgage with the
requirements of the Trust Indenture Act; 
 (v) Add defeasance provisions providing for covenant and legal defeasance
options; 
 (vi) Permit the Company to remove the trustee in certain circumstances; 

(vii) Provide for direction to the trustee under the Mortgage to vote pledged prior lien bonds for specified amendments to the
prior lien mortgage; 
 (viii) Provide broader investment directions to the trustee or permitting the Company to direct
investment of money held by the Trustee, so long as there is no event of default under the Mortgage; 
 (ix) Amend the
definition of “Excepted Property” to exclude property which generally cannot be mortgaged without undue administrative burden (i.e. automobiles), but allowing the Company to subject Excepted Property to the Mortgage; 

(x) Amend the definition of “Bondable Property” to allow all mortgaged property to be bondable; and 

(xi) Update the definition of “Permitted Liens.” 

ARTICLE VI 

MISCELLANEOUS PROVISIONS 

Section 1. Acceptance of Trust. The Trustee accepts the trusts herein declared, provided, created or
supplemented and agrees to perform the same upon the terms and conditions herein and in the Original Indenture, as amended, set forth and upon the following terms and conditions. 

Section 2. Responsibility and Duty of Trustee. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made by the Company solely. In general each and every term and condition
contained in Article XIII of the Original Indenture, as amended by the Second Supplemental Indenture, shall apply to and form part of this Supplemental Indenture with the same force and effect as if the same were herein set forth in full with such
omissions, variations and insertions, if any, as may be appropriate to make the same conform to the provisions of this Supplemental Indenture. 

  
 35 

 Section 3. Parties to Include Successors and Assigns.
Whenever in this Supplemental Indenture either of the parties hereto is named or referred to, such reference shall, subject to the provisions of Articles XII and XIII of the Original Indenture, be deemed to include the successors and assigns of
such party, and all the covenants and agreements in this Supplemental Indenture contained by or on behalf of the Company, or by or on behalf of the Trustee, shall, subject as aforesaid, bind and inure to the respective benefits of the respective
successors and assigns of such parties, whether so expressed or not. 
 Section 4. Benefits Restricted to
Parties and to Holders of Bonds and Coupons. Nothing in this Supplemental Indenture, expressed or implied, is intended or shall be construed, to confer upon, or to give to, any person, firm or corporation, other than the parties hereto
and the holders of the Bonds and coupons outstanding under the Indenture, any right, remedy or claim under or by reason of this Supplemental Indenture or any covenant, condition, stipulation, promise or agreement hereof, and all the covenants,
conditions, stipulations, promises and agreements in this Supplemental Indenture contained by and on behalf of the Company shall be for the sole and exclusive benefit of the parties hereto, and of the holders of the Bonds and of the coupons
outstanding under the Indenture. 
 Section 5. Execution in Counterparts. This Supplemental
Indenture may be executed in several counterparts, and all such counterparts executed and delivered, each as an original, shall constitute but one and the same instrument. 

Section 6. Titles of Articles Not Part of the Forty-Ninth Supplemental Indenture. The Titles of the
several Articles of this Supplemental Indenture shall not be deemed to be any part thereof. 

  
 36 

 IN WITNESS HEREOF, WESTAR ENERGY, INC., party hereto of the first part, has caused its
corporate name to be hereunto affixed, and this instrument to be signed and sealed by its Chairman of the Board, President, Chief Executive Officer or a Vice President, and its corporate seal to be attested by its Secretary or an Assistant Secretary
for and in its behalf, and The Bank of New York Mellon Trust Company, N.A., party hereto of the second part, has caused its corporate name to be hereunto affixed, and this instrument to be signed and sealed by its duly authorized officer and its
corporate seal to be attested by its duly authorized officer, all as of the day and year first above written. 
 (CORPORATE SEAL) 

 

			
	WESTAR ENERGY, INC.
		
	By:	 	/s/ Lori A. Wright
		 	Lori A. Wright
		 	Vice President, Corporate Planning,
		 	Investor Relations and Treasurer

  

			
	ATTEST:
		
	By:	 	/s/ Heather A. Humphrey
		 	Heather A. Humphrey,
		 	Senior Vice President,
		 	General Counsel and Corporate Secretary

  

			
	 Executed, sealed and delivered by WESTAR
ENERGY, INC. in the presence
of:

		
	 By:
	 	 /s/ Jeffrey C. DeBruin

		 	 Jeffrey C. DeBruin

  

			
	By:	 	/s/ Christie Dasek-Kaine
		 	Christie Dasek-Kaine

  
 1 

 
			
	 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee

		
	By:	 	/s/ Mitchell L. Brumwell
		 	Mitchell L. Brumwell

  

			
	ATTEST:
		
	By:	 	/s/ Robert W. Hardy
		 	Robert W. Hardy

  

			
	Executed, sealed and delivered by
		 	THE BANK OF NEW YORK MELLON
		 	TRUST COMPANY, N.A. in the presence of:
		
	By:	 	/s/ Linda Wirfel
		 	Linda Wirfel

  

			
	By:	 	/s/ D.G. Donovan
		 	D. G. Donovan

  
 A-2 

			
	STATE OF KANSAS	  	)
		  	: ss.:
	COUNTY OF SHAWNEE	  	)

 BE IT REMEMBERED, that on this 19th day of August 2019,
before me, the undersigned, a Notary Public within and for the County and State aforesaid, personally came Lori A. Wright and Heather A. Humphrey, of Westar Energy, Inc., a corporation duly organized, incorporated and existing under the laws of the
State of Kansas, who are personally known to me to be such officers, and who are personally known to me to be the same persons who executed as such officers the within instrument of writing, and such persons duly acknowledged the execution of the
same to be the act and deed of said corporation. 
 IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal on
the day and year last above written. 
  

	
	/s/ Annette G. Carter
	Annette G. Garter
	Notary Public
	My Commission Expires
	October 6, 2021
	Jackson County
	Commisison #13779753

  
 A-3 

			
	STATE OF KANSAS	  	)
		  	: ss.:
	COUNTY OF SHAWNEE	  	)

 BE IT REMEMBERED, that on this 19th day of August, 2019,
before me, the undersigned, a Notary Public within and for the County and State aforesaid, personally came Lori A. Wright, and Heather A. Humphrey, of Westar Energy, Inc., a corporation duly organized, incorporated and existing under the laws of the
State of Kansas, who are personally known to me to be such officers, being by me respectively duly sworn, did each say that the said Lori A. Wright is Vice President, Corporate Planning, Investor Relations and Treasurer and that the said Heather A.
Humphrey is Senior Vice President, General Counsel and Corporate Secretary of said corporation, that the consideration of and for the foregoing instrument was actual and adequate, that the same was made and given in good faith, for the uses and
purposes therein set forth and without any intent to hinder, delay, or defraud creditors or purchasers. 
 IN WITNESS WHEREOF, I have
hereunto subscribed my name and affixed my official seal on the day and year last above written. 
  

	
	/s/ Annette G. Carter
	Annette G. Garter
	Notary Public
	My Commission Expires
	October 6, 2021
	Jackson County
	Commisison #13779753

  
 A-4 

			
	STATE OF ILLINOIS	  	)
		  	: ss.:
	COUNTY OF COOK	  	)

 BE IT REMEMBERED, that on this 14th day of August 2019,
before me, the undersigned, a Notary Public within and for the State aforesaid, personally came Mitchell L. Brumwell and Robert W. Hardy, of The Bank of New York Mellon Trust Company, N.A., a national banking association, who are personally known to
me or proved to be on the basis of sufficient identification to be such officers, and who are personally known to me or proved to me on the basis of sufficient identification to be the same persons who executed as such officers the within instrument
of writing, and such persons duly acknowledged the execution of the same to be the act and deed of said corporation. 
  

	
	/s/ Lawrence M. Kusch
	Lawrence M. Kusch
	Notary Public – State of Illinois
	My Commission Expires 10/24/22

  
 A-5

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