Document:

Amend. 1 to Deferred Compensation Plan

 Exhibit 10.4 (a) 
 AMENDMENT NO. 1 
 TO THE 
 PIONEER NATURAL RESOURCES COMPANY 
 EXECUTIVE DEFERRED COMPENSATION PLAN

 (Amended and Restated Effective January 1, 2009) 
 Pursuant to the provisions of Section 11.4 thereof, the Pioneer Natural Resources Company Executive Deferred Compensation Plan
(Amended and Restated Effective January 1, 2009) is hereby amended to add the following sentence to the end of Section 5.1 thereof: 
 For the period beginning January 1, 2005 and ending December 31, 2008, separate subaccounts were established for each Member to reflect the Member’s various Payment Elections for all or certain Plan
Years during such period, as determined in accordance with the Member’s Payment Elections. 
 IN WITNESS WHEREOF, this
Amendment has been executed on this 15th day of June, 2009, to be effective January 1, 2009. 
  

			
	PIONEER NATURAL RESOURCES COMPANY
		
	 By
	 	 /s/ Larry N. Paulsen

		 	 Larry N. Paulsen
 Vice President, Administration and
Risk ManagementFirst Amend to Pioneer USA 401(K)

 Exhibit 10.5 (a) 
 FIRST AMENDMENT TO THE 
 PIONEER NATURAL RESOURCES USA, INC. 
 401(k) and MATCHING PLAN 
 (Effective
as of January 1, 2008) 
 THIS FIRST AMENDMENT is made and entered into by Pioneer Natural Resources USA,
Inc. (the “Company”): 
 WITNESSETH: 
 WHEREAS, the Company maintains the Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan (the “Plan”); 
 WHEREAS, pursuant to Section 8.1 of the Plan, the Board of Directors of the Company maintains the authority to amend the Plan
at any time; and 
 WHEREAS, the Company desires to amend the Plan to provide for partial distributions upon
retirement, disability, or separation from employment. 
 NOW THEREFORE, the Plan is hereby amended effective
January 1, 2009 as follows: 
 1. Section 6.2(a) is hereby amended and restated in its entirety as follows:

 Section 6.2 Distribution of Retirement and Disability Benefits. 
 (a) Except as otherwise provided in this Section, upon the Retirement or termination of employment on account of Permanent
Disability of a Participant, all or a portion of the Vested Interest of such Participant shall be distributed to such Participant by the Trustee at the direction of the Committee in a lump sum; provided, however, that if such Participant’s
Vested Interest exceeds $5,000, he or she may elect to receive his or her Vested Interest in monthly, quarterly or annual installment distributions over a period of two or more years with the first such installment to be payable within 90 days after
the end of the Plan Year in which the Participant’s employment terminates. Such installment payments may be made over a period of years not to exceed one or a combination of the following periods: i) the life of the Participant, ii) the lives
of the Participant and his or her designated beneficiary, iii) a period certain not extending beyond the life expectancy of the Participant, and iv) a period certain not extending beyond the joint life and last survivor expectancy of the Participant
and his or her designated beneficiary. Any provision of Section 6.3 to the contrary notwithstanding, if a Participant who elected installment payments dies prior to the distribution of the entire amount of his or her Vested Interest, the
remaining portion thereof shall be distributed to his or her beneficiary or beneficiaries, as determined in accordance with Section 6.3(a), in a single distribution within 90 days after the end of the Plan Year during which the Participant
died. Notwithstanding the foregoing provisions of this Section 6.2, no distribution shall be made upon a Participant’s termination of employment on account of Permanent Disability prior to his or her Normal Retirement Date unless
(i) such Participant elects to receive such distribution or (ii) such Participant’s Vested Interest does not exceed $5,000. 

  

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For purposes of determining whether the value of a Participant’s Vested Interest exceeds or does not exceed $5,000, the value of a Participant’s
Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account. 
 NOW, THEREFORE, be it further provided that except as provided above, the Plan shall continue to read in its current state. 
 * * * * * * * * 
 IN WITNESS WHEREOF, the Company has executed this
First Amendment this 9th day of June 2009 to be effective as specified above. 
  

			
	PIONEER NATURAL RESOURCES USA, INC.
		
	 By:
	 	 /s/ Larry N. Paulsen

		 	 Larry N. Paulsen
 Vice President, Administration and
Risk Management

  

 2Ameren CIPS - Supplemental Indenture

 Exhibit 4.1 
 When recorded mail to: 
 James A. Tisckos 
 Central
Illinois Public 
 Service Company 
 607 East Adams Street

 Springfield, Illinois 62739 
  
  
  
 Executed in 85 Counterparts, No. __. 
 Supplemental Indenture 
 dated as of June 15, 2009 
 Central Illinois Public Service Company 
 to 
 U.S. Bank National Association 
 and Richard
Prokosch, 
 as trustees 
 (Supplemental to the Indenture of Mortgage or Deed of Trust 
 dated October 1, 1941, executed by Central Illinois Public Service
Company 
 to Continental Illinois National Bank and Trust Company of Chicago 
 and Edmond B. Stofft, as trustees) 
 (Providing for First Mortgage Bonds, 2009 Credit
Agreement Series) 
  
  
  
 This instrument was prepared by Steven R. Sullivan, Senior Vice
President, General Counsel and Secretary of Central Illinois Public Service Company, c/o Ameren Corporation, One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, Missouri 63103. 

 This Supplemental Indenture, dated as of June 15, 2009, made and entered into by and between CENTRAL
ILLINOIS PUBLIC SERVICE COMPANY, a corporation organized and existing under the laws of the State of Illinois (hereinafter commonly referred to as the “Company”), and U.S. BANK NATIONAL ASSOCIATION (formerly U.S. Bank Trust National
Association, formerly First Trust National Association, formerly First Trust of Illinois, National Association, successor trustee to Bank of America Illinois, formerly Continental Bank, formerly Continental Bank, National Association and formerly
Continental Illinois National Bank and Trust Company of Chicago), a national banking association having its office or place of business in the City of Chicago, Cook County, State of Illinois (hereinafter commonly referred to as the
“Trustee”), and Richard Prokosch (successor Co-Trustee), of the City of Oakdale, Washington County, State of Minnesota, as Trustees under the Indenture of Mortgage or Deed of Trust dated October 1, 1941, heretofore executed and
delivered by the Company to Continental Illinois National Bank and Trust Company of Chicago and Edmond B. Stofft, as Trustees, as amended by the Supplemental Indentures dated, respectively, September 1, 1947, January 1,
1949, February 1, 1952, September 1, 1952, June 1, 1954, February 1, 1958, January 1, 1959, May 1, 1963, May 1, 1964, June 1, 1965, May 1,
1967, April 1, 1970, April 1, 1971, September 1, 1971, May 1, 1972, December 1, 1973, March 1, 1974, April 1, 1975, October 1, 1976, November 1,
1976, October 1, 1978, August 1, 1979, February 1, 1980, February 1, 1986, May 15, 1992, July 1, 1992, September 15, 1992, April 1, 1993, June 1,
1995, March 15, 1997, June 1, 1997, December 1, 1998, June 1, 2001, October 1, 2004, June 1, 2006, August 1, 2006 and March 1, 2007 heretofore executed and delivered by the
Company to the Trustees under said Indenture of Mortgage or Deed of Trust dated October 1, 1941; said Indenture of Mortgage or Deed of Trust dated October 1, 1941, as amended by said Supplemental Indentures, being hereinafter sometimes
referred to as the “Indenture”; and said U.S. Bank National Association and Richard Prokosch (successor Co-Trustee) as such Trustees, being hereinafter sometimes referred to as the “Trustees” or the
“Trustees under the Indenture”; 
 WITNESSETH: 
 WHEREAS, the Company has entered into a 2009 Credit Agreement (as amended or otherwise modified from time to time, the “Credit
Agreement”) by and among Ameren Corporation, the Company, Central Illinois Light Company and Illinois Power Company, as borrowers, the lenders from time to time party thereto (the “Lenders”) and JPMorgan Chase Bank, N.A.,
as agent (in such capacity, the “Agent”) for the Lenders, providing for the making of certain financial accommodations thereunder to the Company, and pursuant to such Credit Agreement, the Company has agreed to issue to the Agent,
as evidence of and security for the Obligations (as such term is defined in the Credit Agreement) of the Company (the “Company Obligations”), a new series of bonds under the Indenture; and 
 WHEREAS, for such purposes, the Company has determined, by resolutions duly adopted by its Board of Directors, to issue bonds of an additional series
under and to be secured by the Indenture, as hereby amended, to be known and designated as First Mortgage Bonds, 2009 Credit Agreement Series (hereinafter sometimes referred to as the “bonds of 2009 Credit Agreement Series” or the
“bonds of said Series”), and the bonds of said Series shall be authorized, authenticated and issued only as registered bonds without coupons, and to execute and deliver this supplemental indenture, pursuant to the provisions of
Article I, as amended, Section 6 of Article II and Article XVI of the Indenture, for the purpose of (1) creating and 

  

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authorizing not to exceed $135,000,000 aggregate principal amount of bonds of 2009 Credit Agreement Series and setting forth the form, terms, provisions and
characteristics thereof, and (2) modifying or amending certain provisions of the Indenture in the particulars and to the extent hereinafter specifically provided; and 
 WHEREAS, the bonds of 2009 Credit Agreement Series shall be issued to the Agent as evidence of and security for the Company Obligations under the Credit
Agreement; and 
 WHEREAS, the execution and delivery by the Company of this supplemental indenture have been duly authorized by the Board of
Directors of the Company; and the Company has requested, and hereby requests, the Trustees to enter into and join with the Company in the execution and delivery of this supplemental indenture; and 
 WHEREAS, the bonds of 2009 Credit Agreement Series are to be authorized, authenticated and issued only in the form of registered bonds without coupons,
and the bonds of 2009 Credit Agreement Series and the certificate of the Trustee thereon shall be substantially in the following form, to wit: 
 [FORM OF BOND] 
  

				
	 No. _______
	  	$	__________

 Illinois Commerce Commission 
 Identification No.: Ill. C.C. No. ____ 
 Notwithstanding any provisions hereof or in
the Indenture 
 this Bond is not assignable or transferable except to a successor Agent appointed in 
 accordance with the Credit Agreement hereinafter referred to. 
 Central Illinois Public Service Company 
 First Mortgage Bond, 2009 Credit Agreement Series 

REGISTERED OWNER: JPMorgan Chase Bank, N.A., 
 PRINCIPAL AMOUNT
                                         
                            DOLLARS 
 CENTRAL ILLINOIS PUBLIC SERVICE COMPANY, an Illinois corporation (hereinafter referred to as the “Company”), for value received, hereby
promises to pay to the Registered Owner specified above, as administrative agent (in such capacity, the “Agent”) for the Lenders (as defined below) under the 2009 Credit Agreement by and among Ameren Corporation, the Company, Central
Illinois Light Company and Illinois Power Company, as borrowers, the lenders from time to time party thereto (the “Lenders”) and JPMorgan Chase Bank, N.A., as agent (as amended or otherwise modified from time to time, the
“Credit Agreement”), or registered assigns, the Principal Amount specified above or such lesser principal amount as shall be equal to the Borrower Credit Exposure (as defined in the Credit Agreement) of the Company outstanding on
the Commitment Termination Date (having at any time the meaning such term has at such time under the Credit Agreement) of the Company, but not in 

  

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excess of the Principal Amount of this bond, and to pay interest thereon at the Interest Rate (as defined below) until the principal hereof is paid or duly
made available for payment on the Commitment Termination Date or in the event of redemption of this bond, until the redemption date. 
 Interest on this bond shall be payable on each Interest Payment Date (as defined below), commencing on the first Interest Payment Date next succeeding the date of this bond. If the Commitment Termination Date falls on a day which is not a
Business Day, as defined below, principal and any interest and/or fees payable with respect to the Commitment Termination Date will be paid on the next succeeding Business Day. The interest payable, and punctually paid or duly provided for, on any
Interest Payment Date will, subject to certain exceptions provided in the Supplemental Indenture dated as of June 15, 2009, hereinafter referred to, be paid to the person in whose name this bond (or one or more predecessor bonds) is registered
at the close of business on the Record Date (as defined below); provided, however, that interest payable on the Commitment Termination Date will be payable to the person to whom the principal hereof shall be payable. Should the Company
default in the payment of interest (“Defaulted Interest”), the Defaulted Interest shall be paid to the person in whose name this bond is registered on the Record Date to be established by the Trustee for payment of such Defaulted
Interest. As used herein, (i) “Business Day” shall have the meaning assigned thereto in the Credit Agreement; (ii) “Interest Payment Date” shall mean each date on which Company Obligations constituting
interest and/or fees are due and payable from time to time pursuant to the Credit Agreement; (iii) “Interest Rate” shall mean a rate of interest per annum, adjusted as necessary, to result in an interest payment equal to the
aggregate amount of Company Obligations constituting interest and fees of the Company due under the Credit Agreement on the applicable Interest Payment Date; and (iv) “Record Date” with respect to any Interest Payment Date
shall mean the day (whether or not a Business Day) immediately next preceding such Interest Payment Date. 
 Both the principal of and the
interest on this bond shall be payable in immediately available funds at the office or agency of the Trustee, 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.

 This bond is one of the bonds issued and to be issued from time to time under and in accordance with and all secured by the indenture of
mortgage or deed of trust dated October 1, 1941, executed and delivered by the Company to U.S. Bank National Association (formerly U.S. Bank Trust National Association, formerly First Trust National Association, formerly First Trust of
Illinois, National Association, successor trustee to Bank of America Illinois, formerly Continental Bank, formerly Continental Bank, National Association and formerly Continental Illinois National Bank and Trust Company of Chicago and hereinafter
referred to as the “Trustee”) and Edmond B. Stofft, as Trustees, and the various indentures supplemental thereto, including the Supplemental Indenture pursuant to which $135,000,000 in aggregate principal amount of the First
Mortgage Bonds, 2009 Credit Agreement Series (the “2009 Credit Agreement Series Bonds”) are authorized, each executed and delivered by the Company to the Trustees under said indenture of mortgage or deed of trust dated
October 1, 1941, prior to the authentication of this bond (said indenture of mortgage or deed of trust and said supplemental indentures being hereinafter referred to, collectively, as the “Indenture”); and said U.S. Bank
National Association and Richard Prokosch, of the City of Oakdale, Washington County, State of Minnesota (successor Co-Trustee), being now the Trustees under the Indenture. Reference to 

  

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the Indenture and to all supplemental indentures, if any, hereafter executed pursuant to the Indenture is hereby made for a description of the property
mortgaged and pledged, the nature and extent of the security and the rights of the holders and Registered Owners of said bonds and of the Trustees and of the Company in respect of such security. By the terms of the Indenture the bonds to be secured
thereby are issuable in series, which may vary as to date, amount, date of maturity, rate of interest, redemption provisions, medium of payment and in other respects as in the Indenture provided. 
 The 2009 Credit Agreement Series Bonds are to be issued and delivered to the Agent in order to evidence and secure the obligations of the Company under
the Credit Agreement to make payments to the Lenders under the Credit Agreement and to provide the Lenders the benefit of the lien of the Indenture with respect to the 2009 Credit Agreement Series Bonds. 
 The obligation of the Company to make payments with respect to principal under the Credit Agreement shall not give rise to an obligation to pay principal
of the 2009 Credit Agreement Series Bonds except on the Commitment Termination Date of the Company or upon redemption hereof. If at any time any permanent reduction of the Borrower Sublimit (as defined in the Credit Agreement) of the Company or the
Borrower Credit Exposure (as defined in the Credit Agreement) of the Company shall result in the principal of the 2009 Credit Agreement Series Bonds being greater than the greater of the Borrower Sublimit and the Borrower Credit Exposure, a payment
obligation with respect to the principal of the 2009 Credit Agreement Series Bonds in the amount of such excess shall be deemed discharged upon the effectiveness of such permanent reduction. No payment of principal under the Credit Agreement shall
reduce the principal amount of the 2009 Credit Agreement Series Bonds to an amount less than the greater of the Borrower Sublimit and the Borrower Credit Exposure. 
 The obligation of the Company to make payments with respect to the interest on the 2009 Credit Agreement Series Bonds shall be fully or partially, as the case may be, satisfied and discharged to the extent that, at
the time that any such payment shall be due, the then due interest and/or fees of the Company under the Credit Agreement shall have been fully or partially paid. Satisfaction of any obligation to the extent that payment is made with respect to the
interest and/or fees of the Company under the Credit Agreement means that if any payment is made on the interest and/or fees of the Company under the Credit Agreement, a corresponding payment obligation with respect to the interest on the 2009
Credit Agreement Series Bonds shall be deemed discharged in the same amount as such payment made on the interest and/or fees of the Company under the Credit Agreement. 
 The Trustee may at any time and all times conclusively assume that the obligation of the Company to make payments with respect to the principal of and interest on the 2009 Credit Agreement Series Bonds, so far as such
payments at the time have become due, has been fully satisfied and discharged pursuant to the foregoing paragraphs unless and until the Trustee shall have received a written notice from the Agent stating (i) that timely payment of principal of
or interest on the 2009 Credit Agreement Series Bonds has not been made, (ii) that the Company is in arrears as to the payments required to be made by it to the Agent in connection with the Company Obligations pursuant to the Credit Agreement,
and (iii) the amount of the arrearage. 
  

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 This bond is not redeemable except upon written demand of the Agent following the occurrence of a Default
by the Company under the Credit Agreement and the acceleration of the Company Obligations, as provided under the Credit Agreement. 
 In case
of certain events of default specified in the Indenture, the principal of this bond may be declared or may become due and payable in the manner and with the effect provided in the Indenture. No recourse shall be had for the payment of the principal
of or interest on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture or any indenture supplemental thereto, to or against any incorporator, stockholder, officer or director, past, present or future, of the
Company, or of any predecessor or successor corporation, either directly or through the Company, or such predecessor or successor corporation, under any constitution or statute or rule of law, or by the enforcement of any assessment, penalty or
otherwise, all such liability of incorporators, stockholders, directors and officers being waived and released by the Registered Owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture.

 This bond shall not be assignable or transferable except to a successor Agent appointed in accordance with the Credit Agreement. This bond
is exchangeable by the Registered Owner hereof, in person or by attorney duly authorized, at the principal office or place of business of the Trustee under the Indenture, upon the surrender and cancellation of this bond and the payment of any stamp
tax or other governmental charge, and upon any such exchange a new registered bond or bonds without coupons, of the same series and maturity and for the same aggregate principal amount, will be issued in exchange heretofore; provided, that
the Company shall not be required to exchange any bonds of 2009 Credit Agreement Series for a period of ten (10) days next preceding an Interest Payment Date with respect to such bonds. 
 The Agent shall surrender this bond to the Trustee when each of the Borrower Sublimit and the Borrower Credit Exposure have been reduced to zero and all
fees and other amounts payable by the Company pursuant to the Credit Agreement with respect to the Company Obligations shall have been duly paid. 
 This bond shall not be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee or its successor in trust under the Indenture of the Trustee’s Certificate endorsed
hereon. 
  

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 IN WITNESS WHEREOF, Central Illinois Public Service Company has caused this bond to be executed in its
name by the manual or facsimile signature of its President or one of its Vice-Presidents, and its corporate seal or a facsimile thereof to be affixed or imprinted hereon and attested by the manual or facsimile signature of its Secretary or one of
its Assistant Secretaries. 
  

			
	CENTRAL ILLINOIS PUBLIC SERVICE COMPANY
		
	By	 	 
		 	President

  

			
	Attest:
		
	By	 	 
		 	Secretary

 This bond is one of the bonds of the series designated therein, described in the within mentioned
Indenture. 
  

			
	U.S. BANK NATIONAL ASSOCIATION, as Trustee
		
	By	 	 
		 	Authorized Officer

 [END OF FORM OF BOND] 
 NOW, THEREFORE, in consideration of the premises and of the sum of One Dollar ($1.00) duly paid by the Trustees to the Company, and of other good and
valuable considerations, the receipt whereof is hereby acknowledged, and for the purpose of further securing the due and punctual payment of the principal of and interest on all bonds which have been heretofore or shall be hereafter issued under the
Indenture and indentures supplemental thereto and which shall be at any time outstanding thereunder and secured thereby and $135,000,000 aggregate principal amount of the bonds of 2009 Credit Agreement Series, and for the purpose of securing the
faithful performance and observance of all the covenants and conditions set forth in the Indenture and/or in any indenture supplemental thereto, the Company has given, granted, bargained, sold, transferred, assigned, pledged, mortgaged, warranted
the title to and conveyed, and by these presents does give, grant, bargain, sell, transfer, assign, pledge, mortgage, warrant the title to and convey unto U.S. Bank National Association and Richard Prokosch, of the City of Oakdale, Washington
County, State of Minnesota (successor Co-Trustee), as Trustees under the Indenture as therein provided, and their successors in the trusts thereby created, and to their assigns, all the right, title and interest of the Company in and to any 

  

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and all premises, plants, property, leases and leaseholds, franchises, permits, rights and powers, of every kind and description, real and personal, which
have been acquired by the Company through construction, purchase, consolidation or merger, or otherwise, subsequent to January 1, 2006, and which are owned by the Company at the date of the execution hereof, together with the rents, issues,
products and profits therefrom, excepting, however, and there is hereby expressly reserved and excluded from the lien and effect of the Indenture and of this supplemental indenture, all right, title and interest of the Company, now owned, in and to
(a) all cash, bonds, shares of stock, obligations and other securities not deposited with the Trustee or Trustees under the Indenture, and (b) all accounts and bills receivable, judgments (other than for the recovery of real property or
establishing a lien or charge thereon or right therein) and chooses in action not specifically assigned to and pledged with the Trustee or Trustees under the Indenture, and (c) all personal property acquired or manufactured by the Company for
sale, lease, rental or consumption in the ordinary course of business, and (d) the last day of each of the demised terms created by any lease of property leased to the Company and under each and every renewal of any such lease, the last day of
each and every such demised term being hereby expressly reserved to and by the Company, and (e) all gas, oil and other minerals now or hereafter existing upon, within or under any real estate of the Company subject to, or hereby subjected to,
the lien of the Indenture. 
 And upon the considerations and for the purposes aforesaid, and in order to provide, pursuant to the terms of
the Indenture, for the issuance under the Indenture, as hereby amended, of bonds of 2009 Credit Agreement Series and to fix the terms, provisions and characteristics of the bonds of 2009 Credit Agreement Series, and to modify or amend the Indenture
in the particulars and to the extent hereinafter in this supplemental indenture specifically provided, the Company hereby covenants and agrees with the Trustees as follows: 
 Article I 
 Section 1.1 A series of bonds issuable under the
Indenture, as hereby amended, to be known and designated as “First Mortgage Bonds, 2009 Credit Agreement Series” and which shall be executed, authenticated and issued only in the form of registered bonds without coupons, is hereby
created and authorized. The bonds of 2009 Credit Agreement Series and the Trustee’s Certificate to be endorsed thereon shall be substantially in the form thereof hereinbefore recited (the “Bond Form”). Each bond of 2009 Credit
Agreement Series is to be issued and registered in the name of the Agent under the Credit Agreement to evidence and secure any and all Obligations (as such term is defined in the Credit Agreement) of the Company (the “Company
Obligations”) under the Credit Agreement. Each bond of 2009 Credit Agreement Series shall be dated as of the Interest Payment Date (as defined below) thereof to which interest was paid next preceding the date of issue, unless
(a) issued on an Interest Payment Date thereof to which interest was paid, in which event it shall be dated as of such issue date, or (b) issued prior to the occurrence of the first Interest Payment Date thereof to which interest was paid,
in which event it shall be dated the date of original issuance. 
 The bonds of 2009 Credit Agreement Series shall be issued in the aggregate
principal amount of $135,000,000 and shall mature on the Commitment Termination Date (having at any time the meaning such term has at such time under the Credit Agreement) of the Company. The principal amount of bonds of 2009 Credit Agreement Series
outstanding from time to time shall always be equal to $135,000,000 or such less principal amount as shall be equal to the Borrower Credit Exposure (as defined in the Credit Agreement) of the Company on the Commitment Termination Date, but not in
excess of $135,000,000 
  

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 The bonds of 2009 Credit Agreement Series shall bear interest from their date as set forth in the Bond
Form. Interest on the bonds of 2009 Credit Agreement Series shall be payable on each Interest Payment Date (as defined below), commencing on the first Interest Payment Date next succeeding the date of the bonds of 2009 Credit Agreement Series. If
the Commitment Termination Date falls on a day which is not a Business Day, as defined below, principal and any interest and/or fees payable by the Company with respect to the Commitment Termination Date will be paid on the next succeeding Business
Day. 
 Both the principal of and the interest on the bonds of 2009 Credit Agreement Series shall be payable at the times and in the manner
set forth in the form of bond set out herein and in immediately available funds at the office or agency of the Trustee, 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. 
 Section 1.2 Anything contained in Section 14 of Article I of the Indenture, or elsewhere in the Indenture, to the
contrary notwithstanding, only the person in whose name bonds of 2009 Credit Agreement Series are registered (the “Registered Owner”) at the close of business on the Record Date (as defined below) with respect to any Interest
Payment Date shall be entitled to receive the interest payable on such Interest Payment Date notwithstanding the cancellation of such bonds upon any transfer or exchange subsequent to the Record Date and prior to such Interest Payment Date;
provided, however, that if and to the extent the Company shall default in the payment of the interest due on such Interest Payment Date, such defaulted interest shall be paid to the persons in whose names outstanding bonds of 2009 Credit
Agreement Series are registered on the Record Date to be established by the Trustee for payment of such defaulted interest. 
 The obligation
of the Company to make payments with respect to principal under the Credit Agreement shall not give rise to an obligation to pay principal of the 2009 Credit Agreement Series Bonds except on the Commitment Termination Date of the Company or upon
redemption as provided in this Supplemental Indenture. If at any time any permanent reduction of the Borrower Sublimit (as defined in the Credit Agreement) of the Company or the Borrower Credit Exposure of the Company shall result in the principal
of the 2009 Credit Agreement Series Bonds being greater than the greater of the Borrower Sublimit and the Borrower Credit Exposure, a payment obligation with respect to the principal of the 2009 Credit Agreement Series Bonds in the amount of such
excess shall be deemed discharged upon the effectiveness of such permanent reduction. No payment of principal under the Credit Agreement shall reduce the principal amount of the 2009 Credit Agreement Series Bonds to an amount less than the greater
of the Borrower Sublimit and the Borrower Credit Exposure. 
 The obligation of the Company to make payments with respect to the interest on
the bonds of 2009 Credit Agreement Series shall be fully or partially, as the case may be, satisfied and discharged to the extent that, at the time that any such payment shall be due, the then due interest and/or fees of the Company under the Credit
Agreement shall have been fully or partially 

  

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paid. Satisfaction of any obligation to the extent that payment is made with respect to the interest and/or fees of the Company under the Credit Agreement
means that if any payment is made on the interest and/or fees of the Company under the Credit Agreement, a corresponding payment obligation with respect to the interest on the bonds of 2009 Credit Agreement Series shall be deemed discharged in the
same amount as such payment made on the interest and/or fees of the Company under the Credit Agreement. 
 The Trustee may at any time and
all times conclusively assume that the obligation of the Company to make payments with respect to the principal of and interest on the bonds of 2009 Credit Agreement Series, so far as such payments at the time have become due, has been fully
satisfied and discharged pursuant to the foregoing paragraphs unless and until the Trustee shall have received a written notice from the Agent stating (a) that timely payment of principal of or interest on the bonds of 2009 Credit Agreement
Series has not been made, (b) that the Company is in arrears as to the payments required to be made by it to the Agent in connection with the Company Obligations pursuant to the Credit Agreement, and (c) the amount of the arrearage.

 Section 1.3 As used herein, (a) “Business Day” shall have the meaning assigned thereto in the Credit
Agreement; (b) “Interest Payment Date” shall mean each date on which Company Obligations constituting interest and/or fees are due and payable from time to time pursuant to the Credit Agreement; (c) “Interest
Rate” shall mean a rate of interest per annum, adjusted as necessary, to result in an interest payment equal to the aggregate amount of Company Obligations constituting interest and fees of the Company due under the Credit Agreement on the
applicable Interest Payment Date; and (d) “Record Date” with respect to any Interest Payment Date shall mean the day (whether or not a Business Day) immediately next preceding such Interest Payment Date. 
 Section 1.4 Except as set forth herein, the bonds of 2009 Credit Agreement Series are not redeemable. Upon the occurrence of a Default by the
Company under the Credit Agreement and the acceleration of the Company Obligations, the bonds of 2009 Credit Agreement Series shall be redeemable in whole upon receipt by the Trustee of a written demand from the Agent stating that there has occurred
under the Credit Agreement both a Default by the Company and a declaration of acceleration of the Company Obligations and demanding redemption of the bonds of 2009 Credit Agreement Series (including a description of the amount of principal,
interest, fees, cash collateralization obligations and other amounts which comprise such Company Obligations). The Company waives any right it may have to prior notice of such redemption under the Indenture and any other notice required under the
Indenture, including notice to be given by the Company, shall be deemed satisfied by the notice given by the Agent as aforesaid. Upon surrender of the bonds of 2009 Credit Agreement Series by the Agent to the Trustee, the bonds of 2009 Credit
Agreement Series shall be redeemed at a redemption price equal to the aggregate amount of the Company Obligations. 
 Section 1.5
The bonds of 2009 Credit Agreement Series shall not be assignable or transferable except to a successor Agent appointed in accordance with the Credit Agreement. The bonds of 2009 Credit Agreement Series are exchangeable by the Registered Owner
thereof, in person or by attorney duly authorized, at the principal office or place of business of the Trustee under the Indenture, upon the surrender and cancellation of said bonds and the payment of any stamp tax or other governmental charge, and
upon any such exchange a new registered 

  

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bond or bonds without coupons, of the same series and maturity and for the same aggregate principal amount, will be issued in exchange theretofore; provided,
that the Company shall not be required to exchange any bonds of 2009 Credit Agreement Series for a period of ten (10) days next preceding an Interest Payment Date with respect to such bonds. 
 Section 1.6 The bonds of 2009 Credit Agreement Series shall, from time to time, be executed on behalf of the Company and sealed with the
corporate seal of the Company, all in the manner provided or permitted by Section 6 of Article I of the Indenture, as follows: 
 (a) bonds of 2009 Credit Agreement Series executed on behalf of the Company by its President or a Vice-President and/or by its Secretary or an Assistant Secretary may be so executed by the facsimile signature of such President or
Vice-President and/or of such Secretary or Assistant Secretary, as the case may be, of the Company, or of any person or persons who shall have been such officer or officers, as the case may be, of the Company on or subsequent to the date of this
supplemental indenture, notwithstanding that he or they may have ceased to be such officer or officers of the Company at the time of the actual execution, authentication, issue or delivery of any of such bonds, and any such facsimile signature or
signatures of any such officer or officers on any such bonds shall constitute execution of such bonds on behalf of the Company by such officer or officers of the Company for the purposes of the Indenture, as hereby amended, and shall be valid and
effective for all purposes, provided that all bonds shall always be executed on behalf of the Company by the signature, manual or facsimile, of its President or a Vice-President and of its Secretary or an Assistant Secretary, and provided, further,
that none of such bonds shall be executed on behalf of the Company by the same officer or person acting in more than one capacity; and 
 (b) such corporate seal of the Company may be a facsimile, and any bonds of 2009 Credit Agreement Series on which such facsimile seal shall be affixed, impressed, imprinted or reproduced shall be deemed to be sealed
with the corporate seal of the Company for the purposes of the Indenture, as hereby amended, and such facsimile seal shall be valid and effective for all purposes. 
 Section 1.7 As provided in Section 8.4 of the Credit Agreement, the Agent shall surrender the bonds of 2009 Credit Agreement Series to the Trustee for cancellation when each of the Borrower Sublimit
and the Borrower Credit Exposure have been reduced to zero and all fees and other amounts payable by the Company pursuant to the Credit Agreement with respect to the Company Obligations shall have been duly paid. 
 Article II 
 Section 2.1
Sections 10 and 16 of Article III of the Indenture are, and each of them is, hereby amended by striking out the words “Series 1997-2, Senior Notes Series AA-1, Senior Notes Series AA-2, Senior Notes Series BB, Environmental Improvement
Series 2004, Senior Notes Series CC, 2006 Credit Agreement Series and 2007 Credit Agreement Series” wherever the same occur in each of said sections, and by inserting, in lieu thereof, the words “Series 1997-2, Senior Notes Series
AA-2, Senior Notes Series BB, Senior Notes Series CCs and 2009 Credit Agreement Series” and the Company hereby covenants and agrees to observe and comply with the provisions of said sections as hereby amended. 
  

 11 

 Article III 
 Section 3.1 The provisions of this supplemental indenture shall become and be effective from and after the execution hereof, and the Indenture, as hereby amended, shall remain in full force and effect.

 Section 3.2 Each reference in the Indenture, or in this supplemental indenture, to any article, section, term or provision of
the Indenture shall mean and be deemed to refer to such article, section, term or provision of the Indenture, as hereby amended, except where the context otherwise indicates. 
 Section 3.3 All the covenants, provisions, stipulations and agreements in this supplemental indenture contained are and shall be for the sole
and exclusive benefit of the parties hereto, their successors and assigns, and of the holders and Registered Owners from time to time of the bonds of 2009 Credit Agreement Series and of the coupons issued and outstanding from time to time under and
secured by the Indenture, as hereby amended, and the Agent, for the benefit of the Lenders under the Credit Agreement. 
 This supplemental
indenture has been executed in a number of identical counterparts, each of which so executed shall be deemed to be an original. 
  

 12 

 At the time of the execution of this supplemental indenture, the aggregate principal amount of all
indebtedness of the Company outstanding, or to be presently outstanding, under and secured by the Indenture, as hereby amended and supplemented, is $446,500,000, evidenced by First Mortgage Bonds of the series listed below, issued by the Company
under said Indenture and now outstanding or to be presently issued by it under said Indenture, as follows: 
  

								
	 Series
	  	Interest Rate (%)	 	 	Maturity Date	  	Principal
Amount ($)
	 1997-2
	  	7.61	  	 	June 1, 2017	  	40,000,000
	 Senior Notes AA-2
	  	6.125	% 	 	December 15, 2028	  	60,000,000
	 Senior Notes BB
	  	6.625	% 	 	June 15, 2011	  	150,000,000
	 Senior Notes CC
	  	6.70	% 	 	June 15, 2036	  	61,500,000
	 2009 Credit Agreement
	  	*	  	 	*	  	135,000,000
		  			 		  	 
		  			 	Total	  	446,500,000

  

	*	As determined in accordance with the Credit Agreement. 

 Section 3.4 The Company acknowledges and intends that all advances made to it by the Lenders under the Credit Agreement, including future advances whenever hereafter made, shall be a lien from the time this Supplemental
Indenture is recorded, as provided in Section 15-1302(b)(1) of the Illinois Mortgage Foreclosure Law (the “Act”), 735 ILCS 15-1101, et seq. The amount of the bonds of the 2009 Credit Agreement Series which comprises the principal
amount then outstanding of the Obligations under the Credit Agreement constitutes revolving credit indebtedness secured by a mortgage on real property, pursuant to the terms and conditions of 205 ILCS 5/5d from the date of this Supplemental
Indenture. 
  

 13 

 In WITNESS WHEREOF, said Central Illinois Public Service Company has caused this instrument to be
executed in its corporate name by its President or a Vice President and its corporate seal or a facsimile thereof to be hereunto affixed and to be attested by its Secretary or an Assistant Secretary, and said U.S. Bank National Association, for the
purpose of entering into and joining with the Company in the execution of this supplemental indenture, has caused this instrument to be executed in its corporate name by one of its Vice Presidents and to be attested by one of its Assistant Vice
Presidents, and said Richard Prokosch, for the purpose of entering into and joining with the Company in the execution of this supplemental indenture, has signed this instrument; all as of the day and year first above written. 
  

			
	Central Illinois Public Service Company
		
	By	 	/s/ Jerre E. Birdsong
	Name:	 	Jerre E. Birdsong
	Title:	 	Vice President and Treasurer

 (Corporate Seal) 
  

			
	Attest:
		
	By:	 	/s/ G. L. Waters
	Name:	 	G. L. Waters
	Title:	 	Assistant Secretary

			
	U.S. Bank National Association
		
	By:	 	/s/ Richard Prokosch
	Name:	 	Richard Prokosch
	Title:	 	Vice President

  

			
	Attest:
		
	By:	 	/s/ Darlene Garsteig
	Name:	 	Darlene Garsteig
	Title:	 	Assistant Vice President

  

			
	By:	 	/s/ Richard Prokosch
		 	Richard Prokosch

					
	State of Missouri	  	)	  	
		  	)	  	SS
	City of St. Louis	  	)	  	

 I, Debby Anzalone, a Notary Public, do hereby certify that Jerre E. Birdsong, Vice President and
Treasurer of Central Illinois Public Service Company, a corporation organized and existing under the laws of the State of Illinois, and G. L. Waters, Assistant Secretary of said corporation, who are both personally known to me to be the same persons
whose names are subscribed to the foregoing instrument as such officers, respectively, of said corporation, and who are both personally known to me to be such officers, appeared before me this day in person and severally acknowledged that they
signed, sealed and delivered said instrument as their free and voluntary act as such officers, and as the free and voluntary act of said corporation, for the uses and purposes therein set forth. 
 Given under my hand and official seal this 22nd day of June, 2009, in the City and State aforesaid. 
  

	
	/s/ Debby Anzalone      
	 Debby Anzalone
 Notary Public

 (Notarial Seal) 
 My commission expires May 4, 2010 

					
	State of Minnesota	  	)	  	
		  	)	  	SS
	County of Ramsey	  	)	  	

 I, Denise R. Landeen, a Notary Public in and for Ramsey County in the State aforesaid, do hereby
certify that: 
 (a) Richard Prokosch, a Vice President of U.S. Bank National Association, a national banking association, and Darlene
Garsteig, an Assistant Vice President of said association, who are both personally known to me to be the same persons whose names are subscribed to the foregoing instrument as such officers, respectively, of said association, and who are both
personally known to me to be such officers, appeared before me this day in person and severally acknowledged that they signed, sealed and delivered said instrument as their free and voluntary act as such officers, and as the free and voluntary act
of said association, for the uses and purposes therein set forth; and 
 (b) Richard Prokosch, personally known to me to be the same person
whose name is subscribed to the foregoing instrument, appeared before me this day in person and acknowledged that he signed, sealed and delivered said instrument as his free and voluntary act, for the uses and purposes therein set forth. 

Given under my hand and official seal this 19th day of June, 2009. 
  

	
	/s/ Denise R. Landeen      
	 Denise R. Landeen
 Notary Public

 (Notarial Seal) 
 My Commission expires January 31, 2012

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