Document:

First Supplemental Purchase Contract and Pledge Agreement

 Exhibit 4.2 
 GREAT PLAINS ENERGY INCORPORATED 
 and 

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
 as Purchase Contract Agent 
 and 

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
 as Collateral Agent, Custodial Agent and Securities Intermediary 
 FIRST
SUPPLEMENTAL PURCHASE CONTRACT AND PLEDGE AGREEMENT 
 Dated as of March 19, 2012 

THIS FIRST SUPPLEMENTAL PURCHASE CONTRACT AND PLEDGE AGREEMENT, dated as of March 19, 2012, between Great Plains Energy
Incorporated, a Missouri corporation (the “Company”), and The Bank of New York Mellon Trust Company, N.A., as Purchase Contract Agent and attorney-in-fact of the Holders from time to time of the Units (“Purchase Contract
Agent”), and The Bank of New York Mellon Trust Company, N.A., as Collateral Agent, Custodial Agent and Securities Intermediary (this “Supplemental PCPA”), amends and supplements the Purchase Contract and Pledge Agreement,
dated as of May 18, 2009, between the Company and The Bank of New York Mellon Trust Company, N.A., as the Purchase Contract Agent, and The Bank of New York Mellon Trust Company, N.A., as the Collateral Agent, Custodial Agent and Securities
Intermediary (the “Original PCPA”). The Original PCPA, as amended and supplemented by this Supplemental PCPA, shall be referred to herein as the “PCPA.” 

RECITALS 

WHEREAS, the Company and The Bank of New York Mellon Trust Company, N.A., as Purchase Contract Agent, Collateral Agent, Custodial Agent
and Securities Intermediary, entered into the Original PCPA in connection with the issuance by the Company of its 5,750,000 Equity Units on May 18, 2009; 
 WHEREAS, pursuant to Section 8.01(e) of the Original PCPA, the Company desires to amend the Original PCPA to eliminate the requirement that the Securities Intermediary purchase the Remarketing
Treasury Portfolio with the proceeds of an Early Remarketing and to instead provide for the direct delivery to the Collateral Account of the Remarketing Treasury Portfolio in connection with an Early Remarketing; and 

WHEREAS, the Company has requested that The Bank of New York Mellon Trust Company, N.A., as Purchase Contract Agent, Collateral Agent,
Custodial Agent and Securities Intermediary, execute and deliver this Supplemental PCPA, and all requirements necessary to make this Supplemental PCPA a valid, binding and enforceable instrument in accordance with its terms have been done and
performed, and the execution and delivery of this Supplemental PCPA has been duly authorized in all respects. 
 NOW, THEREFORE,
in consideration of the covenants and agreements set forth herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 

ARTICLE I 

DEFINITIONS 
 Section 1.01 Definition of Terms. A term not defined in this Supplemental PCPA that is defined in the Original PCPA has the same meaning when used in this Supplemental PCPA. 

 ARTICLE II 
 AMENDMENT TO THE ORIGINAL PCPA 
 Section 2.01 Amendments to
Section 5.02(a)(ii)(A) of the Original PCPA. 
 The fourth, fifth and sixth sentences of Section 5.02(a)(ii)(A) of
the Original PCPA are hereby deleted in their entirety and replaced with the following: 
 If the Remarketing
Agent(s) is able to remarket such Notes for at least the applicable Remarketing Price (a “Successful Early Remarketing”), the Collateral Agent shall cause the Securities Intermediary to transfer to the Remarketing Agent(s) the
remarketed Notes underlying the Pledged Applicable Ownership Interests in Notes upon confirmation of deposit to the Collateral Account of (A) the Remarketing Treasury Portfolio, which shall have been purchased by the Quotation Agent with the
proceeds of such Successful Early Remarketing attributable to such Notes, and (B) any remaining proceeds in excess of the Remarketing Treasury Portfolio Purchase Price (the “Excess Proceeds”), and the Custodial Agent shall
transfer the remarketed Separate Notes to the Remarketing Agent(s) upon confirmation of receipt of proceeds of such Successful Early Remarketing attributable to such Separate Notes. Settlement shall occur on the Remarketing Settlement Date. Upon
deposit in the Collateral Account of the Remarketing Treasury Portfolio and any Excess Proceeds, the Collateral Agent shall (1) credit to the Collateral Account the Applicable Ownership Interests in the Remarketing Treasury Portfolio, and
(2) promptly remit any such Excess Proceeds to the Purchase Contract Agent for payment to the Holders of Corporate Units, whereupon the Purchase Contract Agent shall make such payment on the Remarketing Settlement Date to the Holders pro rata
in accordance with their respective interests. 
 ARTICLE III 

MISCELLANEOUS 
 Section 3.01 Ratification of PCPA. The PCPA, as amended and supplemented by this Supplemental PCPA, is in all respects ratified and confirmed, and this Supplemental PCPA shall be deemed part
of the PCPA in the manner and to the extent herein and therein provided. 
 Section 3.02 New York Law to Govern.
THIS SUPPLEMENTAL PCPA SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND PERFORMED WHOLLY WITHIN SUCH STATE. 

Section 3.03 Separability. In case any one or more of the provisions contained in this Supplemental PCPA shall for any reason
be held to be invalid, illegal or unenforceable in any respect, then, to the extent permitted by law, such invalidity, illegality or unenforceability shall not affect any other provisions of this Supplemental PCPA, but this Supplemental PCPA shall
be construed as if such invalid or illegal or unenforceable provision had never been contained herein or therein. 

Section 3.04 Counterparts. This Supplemental PCPA may be executed in any number of counterparts each of which shall be an
original, but such counterparts shall together constitute but one and the same instrument. 
 Section 3.05 Purchase
Contract Agent, Collateral Agent, Custodial Agent and Securities Intermediary Not Responsible for Recitals. The recitals herein contained are made by the Company and not by the Purchase Contract Agent, Collateral Agent, Custodial Agent or
Securities Intermediary, and the Purchase Contract Agent, Collateral Agent, Custodial Agent and Securities Intermediary assume no responsibility for the correctness thereof. The Purchase Contract Agent, Collateral Agent, Custodial Agent and
Securities Intermediary make no representations as to the validity or sufficiency of this Supplemental PCPA. 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental PCPA to be duly
executed, as of the day and year first written above. 
  

			
	GREAT PLAINS ENERGY INCORPORATED
		
	By:	 	/s/ Michael J. Chesser
	 Name: Michael J. Chesser
 Title: Chairman of the Board and Chief Executive Officer

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

as Purchase Contract Agent and as attorney-in-fact
 of the Holders from time to time of the Units

		
	By:	 	/s/ Linda Garcia
	 Name: Linda Garcia

Title: Vice President

	
	 THE BANK OF NEW YORK MELLON TRUST
 COMPANY, N.A.,
 as Collateral Agent, Custodial Agent and

Securities Intermediary

		
	By:	 	/s/ Linda Garcia
	 Name: Linda Garcia

Title: Vice PresidentForm of 2.150% Senior Note due 2015

 Exhibit 4.2 
 2.150% SENIOR NOTE DUE 2015 
 THIS IS A SECURITY IN GLOBAL FORM WITHIN THE MEANING OF THE SENIOR
INDENTURE REFERRED TO HEREINAFTER. 
 UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A
NEW YORK CORPORATION (THE “DEPOSITARY”) TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 TRANSFERS OF THIS
GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF THE DEPOSITARY OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN
ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE SENIOR INDENTURE REFERRED TO ON THE REVERSE HEREOF. 
 THIS SECURITY IS NOT A SAVINGS
ACCOUNT, DEPOSIT OR OTHER OBLIGATION OF A BANK AND IS NOT INSURED BY THE FDIC OR ANY OTHER GOVERNMENTAL AGENCY OR INSTRUMENTALITY. 
  

					
	CUSIP No. 14040HAZ8	  			
	ISIN No. US14040HAZ82	  			
	No. [__]	  	Principal Amount $	[____________	] 

 CAPITAL ONE FINANCIAL CORPORATION 
 2.150% SENIOR NOTES DUE 2015 
 Capital One Financial Corporation, a Delaware
corporation (the “Company”), for value received, hereby promises to pay to Cede & Co. or registered assigns the principal sum of [            ], at the Company’s
office or agency for said purposes, on March 23, 2015 (the “Stated Maturity”). 
 Interest Payment Dates:
March 23 and September 23 
 Regular Record Dates: March 10 and September 10 

Reference is made to the further provisions set forth on the reverse hereof, including the definitions of certain capitalized terms. Such
further provisions shall for all purposes have the same effect as though fully set forth at this place. 
 This Security shall
not be valid or obligatory until the certificate of authentication hereon shall have been duly signed by the Trustee acting under the Senior Indenture. 

 IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed. 

Dated: 
  

					
	CAPITAL ONE FINANCIAL CORPORATION
		
	 By:
	 	 
		 	 Name:

		 	 Title:

		
	 Attest By:
	 	 
		 		 	 Name:

		 		 	 Title:

 TRUSTEE’S CERTIFICATE OF AUTHENTICATION 

This is one of the Securities issued under the within-mentioned Senior Indenture. 

Dated: 
  

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

		
	 By:
	 	 
		 	Authorized Signatory

 REVERSE OF SECURITY 
 Capital One Financial Corporation 
 2.150% Senior Notes Due 2015 

This Security is one of a duly authorized issue of debt securities of the Company, of the series hereinafter specified, all issued or to
be issued under a Senior Indenture, dated as of November 1, 1996 (the “Senior Indenture”), and duly executed and delivered by the Company to The Bank of New York Mellon Trust Company, N.A., formerly known as The Bank of New York Trust
Company, N.A., as successor to Harris Trust and Savings Bank, as trustee (hereinafter, the “Trustee”). Reference to the Senior Indenture and the Officers’ Certificate thereunder establishing the terms of this Security is hereby made
for a description of the respective rights and duties thereunder of the Trustee, the Company and the Holders of the Securities. This Security is one of a series designated as the “2.150% Senior Notes Due 2015” of the Company (hereinafter
called the “Notes”), issued under the Senior Indenture. Each Holder by accepting a Note, agrees to be bound by all terms and provisions of the Senior Indenture, as amended from time to time, applicable to the Notes. 

Neither the Senior Indenture nor the Notes limit or otherwise restrict the amount of indebtedness which may be incurred or other
securities which may be issued by the Company. The Notes issued under the Senior Indenture are direct, unsecured obligations of the Company and will mature on March 23, 2015. The Notes rank on parity with all other unsecured, unsubordinated
indebtedness of the Company. 
 The Company promises to pay interest on the principal amount of this Security at the rate of
2.150% per annum. The Company will pay interest semi-annually in arrears on March 23 and September 23 of each year (each, an “Interest Payment Date”), commencing on September 23, 2012. Interest on this Security will
accrue from March 23, 2012 or from the most recent March 23 or September 23, as the case may be, to which interest on the Notes has been paid or duly provided for, until payment of said principal sum has been made or duly provided
for. Interest on the Notes will be computed on the basis of a 360-day year of twelve 30-day months. The Company will pay interest to the Person in whose name this Security is registered at the close of business on March 10 or September 10,
as the case may be, next preceding the applicable Interest Payment Date, except that the Company will pay the interest payable at the Stated Maturity of this Security to the Person or Persons to whom principal is payable. The Company will pay
interest in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts. The Company will make payments in respect of Notes in global form (including principal and
interest) to the Holder thereof or a nominee of the Holder, by wire transfer of immediately available funds as of the close of business on the date such payments are due. 
 If the Company defaults in the payment of interest due on any Interest Payment Date after taking into account any applicable grace period, such defaulted interest shall be paid as set forth in the Senior
Indenture. 
 The Notes are not entitled to any sinking fund. 

 The Notes are subject to defeasance pursuant to Section 402 of the Senior Indenture.

 The Notes are not convertible into common stock of the Company. 

In case an Event of Default shall have occurred and is continuing with respect to the Notes, the principal hereof may be declared, and
upon such declaration shall become, due and payable, in the manner, with the effect and subject to the conditions provided in the Senior Indenture. The Senior Indenture provides that in certain circumstances such declaration and its consequences may
be waived by the Holders of not less than a majority in aggregate principal amount of the Notes then Outstanding. However, any such consent or waiver by the Holder shall not affect any subsequent default or impair any right consequent thereon.

 The Senior Indenture permits the Company and the Trustee, without the consent of the Holders of the Notes for certain
situations and with the consent of not less than two-thirds of the Holders in aggregate principal amount of the Outstanding Notes of each series affected by such supplemental indenture in other situations, to execute supplemental indentures adding
to, modifying, or changing various provisions of, the Senior Indenture; provided that no such supplemental indenture, without the consent of the Holder of each Outstanding Note affected thereby, shall (i) change the Stated Maturity of the
principal of or any installment of interest on the Notes; (ii) reduce the principal amount thereof or the rate of interest thereon, or adversely affect the right of repayment of any Holder; (iii) change the Place of Payment or Currency in
which the principal of or interest on the Notes is payable, or impair the right to institute suit for the enforcement of any payment on or after the Stated Maturity thereof; (iv) reduce the percentage in principal amount of the Outstanding
Notes, the consent of whose Holders is required for any such supplemental indenture, or the consent of whose Holders is required for any waiver (of compliance with certain provisions of the Senior Indenture or certain defaults thereunder and their
consequences) provided for in the Senior Indenture, or reduce the requirements of Section 1504 for quorum or voting; or (v) modify any of the provisions of Sections 902, 513 or 1008 of the Senior Indenture, except to increase any such
percentage or provide that certain other provisions of the Senior Indenture cannot be modified or waived without the consent of the Holder of each Outstanding Note affected thereby. 

The Company may omit in any particular instance to comply with any term, provision or condition set forth in Section 1005, 1006 or
1007 of the Senior Indenture, if before the time it would have to comply, the Holders of at least a majority in principal amount of the Outstanding Notes, by act of such Holders, either shall waive such compliance in such instance or generally shall
have waived compliance with such term, provision or condition, but no such waiver shall extend to or affect such term, provision or condition except to the extent so expressly waived, and, until such waiver shall become effective, the obligations of
the Company and the duties of the Trustee in respect of any such term, provision or condition shall remain in full force and effect. 
 No reference herein to the Senior Indenture and no provision of this Security or of the Senior Indenture shall alter or impair the obligations of the Company, which are absolute and unconditional, to pay
the principal of or interest on this Security at the respective times and at the rate herein prescribed. 

 The Notes are issuable in registered form without coupons in minimum denominations of $2,000
and in integral multiples of $1,000 in excess thereof. A Holder may exchange the Notes for a like aggregate principal amount of Notes of other authorized denominations in the manner and subject to the limitations provided in the Senior Indenture.

 Upon due presentment for registration of transfer of the Notes at the office or agency for said purpose of the Company, a new
Note or Notes of authorized denominations, for a like aggregate principal amount, will be issued to the transferee as provided in the Senior Indenture. No service charge shall be made for any such transfer, but the Company may require payment of a
sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto. 
 Prior to due
presentation of this Security for registration of transfer, the Company, the Trustee, and any agent of the Company or the Trustee, may deem and treat the Holder hereof as the owner of this Security (whether or not any payment with respect to this
Security shall be overdue), for the purpose of receiving payment of principal of and (subject to the provisions of the Senior Indenture) interest hereon and for all other purposes whatsoever, whether or not any payment with respect to this Security
shall be overdue, and neither the Company, nor the Trustee nor any agent of the Company or the Trustee shall be affected by notice to the contrary. 
 No recourse shall be had for the payment of the principal of or interest on this Security, for any claim based hereon, or otherwise in respect hereof, or based on or in respect of the Senior Indenture or
any indenture supplemental thereto, or because of the creation of any indebtedness represented thereby, against any incorporator, shareholder, officer or director, as such, past, present or future, of the Company or of any successor corporation,
either directly or through the Company or any 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 being, by the acceptance hereof
and as part of the consideration for the issue hereof, expressly waived and released. 
 THIS SECURITY SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK. 
 All terms used in this Security (and not otherwise defined in
this Security) that are defined in the Senior Indenture shall have the meanings assigned to them in the Senior Indenture.

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