Document:

Ameren CILCO - Supplemental Indenture

 Exhibit 4.2 
 When recorded mail to: 
 Craig W. Stensland 
 Central
Illinois Light Company 
 One Ameren Plaza (MC 1310) 
 1901
Chouteau Avenue 
 St. Louis, Missouri 63103 
  
  
  
 Indenture 
 Between 
 Central Illinois Light Company 
 and

 Deutsche Bank Trust Company Americas, 
 as
successor Trustee under Indenture of Mortgage and Deed of Trust, dated as of April 1, 1933, between Illinois Power Company and Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas), as Trustee, as amended and supplemented
by Indenture between the same parties, dated as of June 30, 1933, and as amended, supplemented and assumed by Indenture dated as of July 1, 1933, between Central Illinois Light Company and Bankers Trust Company (predecessor of Deutsche
Bank Trust Company Americas), as Trustee, and as amended and supplemented by various Indentures between the same parties bearing subsequent dates. 
 Dated as of June 15, 2009 
 This instrument was prepared by Steven R. Sullivan, Senior Vice President, General Counsel and Secretary of
Central Illinois Light Company, 300 Liberty Street, Peoria, Illinois 61602, (314) 554-2098. 
  
  
  

 Indenture dated as of the 15th day of June, 2009 (hereinafter sometimes referred to as this “Supplemental Indenture”), between Central Illinois Light
Company, a corporation of the State of Illinois (hereinafter sometimes referred to as the “Company”), party of the first part, and Deutsche Bank Trust Company Americas, a corporation of the State of New York, as successor Trustee
(hereinafter sometimes referred to as the “Trustee”), party of the second part, under the Indenture of Mortgage and Deed of Trust between Illinois Power Company and Bankers Trust Company (predecessor of Deutsche Bank Trust Company
Americas), as Trustee, dated as of April 1, 1933, as amended and supplemented by Indenture between said Illinois Power Company and said Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas), dated as of June 30, 1933,
and as amended, supplemented and assumed by Indenture between the Company and said Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas), dated as of July 1, 1933, and as amended and supplemented by various Indentures
between the Company and said Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas) bearing subsequent dates (said Indenture of Mortgage and Deed of Trust as amended, supplemented and assumed being hereinafter sometimes referred
to as the “Indenture”). 
 WHEREAS, the Indenture provides for the issuance of bonds thereunder in one or more series, the form of
which series of bonds to be substantially in the form set forth therein with such insertions, omissions and variations as the Board of Directors of the Company may determine; and 
 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 Public Service 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, by appropriate corporate action in conformity with the terms of the Indenture, has duly determined to create a
series of bonds under the Indenture to be designated as “First Mortgage Bonds, 2009 Credit Agreement Series” (hereinafter sometimes referred to as the “bonds of the 2009 Credit Agreement Series”), the bonds of which series are to
be issued as registered bonds without coupons and are to bear interest as specified in the form of bond of the 2009 Credit Agreement Series set forth below and are to mature, subject to prior acceleration and redemption, on the Commitment
Termination Date (as such term is defined in the Credit Agreement); 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 
  

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 WHEREAS, the definitive registered bonds without coupons of the 2009 Credit Agreement Series (certain of
the provisions of which may be printed on the reverse side thereof) and the Trustee’s certificate of authentication to be borne by such bonds are to be substantially in the following forms, respectively: 
 [General Form of Registered Bond of the 2009 Credit Agreement Series] 
  

			
	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 LIGHT COMPANY 
 First Mortgage Bond, 2009 Credit Agreement
Series 
 Illinois Commerce Commission 
 Identification No.: Ill. C.C. [            ] 
 Central Illinois Light Company, a corporation of the State of Illinois (hereinafter called the “Company”), for value received, hereby promises to pay to JPMorgan Chase Bank, N.A., as 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 Public Service Company and Illinois Power Company, as borrowers, the lenders from time to time
party thereto (the “Lenders”) and the 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 amount of 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 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 

  

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Record Date to be established by the Trustee for payment of such Defaulted Interest. As used herein, (1) “Business Day” shall have the meaning
assigned thereto in the Credit Agreement; (2) “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;
(3) “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 (4) “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 of the Trustee
hereinafter referred to. 
 This bond is 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 this bond 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 this bond 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 this bond, 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 (1) that timely payment of principal of or interest on this bond has not been made, (2) 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 (3) the amount of the arrearage. 
  

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 This bond is one of an issue of bonds of the Company, issuable in series, and is one of a series known as
its First Mortgage Bonds of the series designated in its title, all issued and to be issued under and equally secured (except as to any sinking fund established in accordance with the provisions of the Mortgage (defined below) for the bonds of any
particular series) by an Indenture of Mortgage and Deed of Trust dated as of April 1, 1933, executed by Illinois Power Company to Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas) or its successor (hereinafter
sometimes referred to as the “Trustee”) as Trustee, as amended by Indenture dated as of June 30, 1933, as assumed by the Company and as amended and supplemented by Indentures between the Company and the Trustee bearing subsequent
dates, including the Indenture dated as of June 15, 2009 (all of which indentures are herein collectively called the “Mortgage”), to which reference is made for a description of the property mortgaged and pledged, the nature and
extent of the security, the rights of the holders of the bonds in respect thereof and the terms and conditions upon which the bonds are secured. 
 As more fully described in the Indenture, the rights and obligations of the Company and the rights of the bondholders may be modified with the consent of the holders of not less than 60% in principal amount of the bonds adversely affected;
provided, however, that no modification shall (1) extend the time, or reduce the amount, of any payment on any bond, without the consent of the holder of each bond so affected, (2) permit the creation of any lien, not otherwise
permitted, prior to or on a parity with the lien of the Mortgage, without the consent of the holders of all bonds then outstanding, or (3) reduce the above percentage of the principal amount of bonds the holders of which are required to approve
any such modification without the consent of the holders of all bonds then outstanding. 
 The principal hereof may be declared or may become
due on the conditions, with the effect, in the manner and at the time set forth in the Mortgage, upon the occurrence of a completed default as in the Mortgage provided. 
 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 under the Credit
Agreement. 
 In the manner and upon payment of the charges prescribed in the Mortgage, registered bonds without coupons of this series may
be exchanged for a like aggregate principal amount of fully registered bonds of other authorized denominations of the same series, upon presentation and surrender thereof, for cancellation, to the Trustee at its principal office in the Borough of
Manhattan, The City of New York, New York. 
 This bond shall not be assignable or transferable except to a successor Agent appointed in
accordance with the Credit Agreement. Subject to the restriction on transfer of this bond hereinbefore set forth, this bond is transferable as prescribed in the Mortgage by the registered owner hereof in person, or by his duly authorized attorney,
at the office or agency of the Company in the Borough of Manhattan, The City of New York, New York, upon surrender and cancellation of this bond, and, thereupon, a new fully registered bond of the same series for a like 

  

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principal amount will be issued to the transferee in exchange therefor as provided in the Mortgage, and upon payment, if the Company shall require it, of the
charges therein prescribed; provided, that the Company shall not be required to exchange any bonds of this 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 of the Company 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. 
 No recourse shall be had for the payment of the principal of or interest on this bond against any incorporator or any past, present or future subscriber to the capital stock, stockholder, officer or director of the
Company or of any predecessor or successor corporation, either directly or through the Company or any predecessor or successor corporation, under any rule of law, statute or constitution or by the enforcement of any assessment or otherwise, all such
liability of incorporators, subscribers, stockholders, officers and directors being released by the holder or owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Mortgage. 
 This bond shall not become obligatory until Deutsche Bank Trust Company Americas, the Trustee under the Mortgage, or its successor thereunder, shall have
signed the form of certificate endorsed hereon. 
 IN WITNESS WHEREOF, Central Illinois Light Company has caused this bond to be signed in
its name by its President or a Vice President by a facsimile of his signature and a facsimile of its corporate seal to be printed hereon, attested by its Secretary or an Assistant Secretary by a facsimile of his signature. 
  

									
	Dated:	 		 	
			
	[Seal]	 		 	Central Illinois Light Company
					
		 		 		 	By	 	 
		 		 		 		 	[President]

  

	
	Attest:
	
	  
	[Secretary]

  

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 [Form of Trustee’s Certificate] 
 This bond is one of the bonds of the series designated therein, described in the within-mentioned Mortgage. 
  

			
	Deutsche Bank Trust Company Americas,
as Trustee
	
	By Deutsche Bank National Trust Company
		
	By	 	 
		 	Authorized Officer

 and 
 WHEREAS, all things necessary to make the bonds of the 2009 Credit Agreement Series, when authenticated by the Trustee and issued as in the Indenture provided, the valid, binding and legal obligations of the Company, entitled in all
respects to the security of the Indenture, have been done and performed, and the creation, execution and delivery of this Supplemental Indenture have in all respects been duly authorized; and 
 WHEREAS, the Company and the Trustee deem it advisable to enter into this Supplemental Indenture for the purpose of describing the bonds of the 2009
Credit Agreement Series, and of providing the terms and conditions of redemption thereof; 
 NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE
WITNESSETH: That Central Illinois Light Company, in consideration of the premises and of one dollar to it duly paid by the Trustee at or before the unsealing and delivery of these presents, the receipt whereof is hereby acknowledged, and of the
purchase and acceptance of the bonds issued or to be issued hereunder by the holders or registered owners thereof, and in order to secure the payment both of the principal and interest of all bonds at any time issued and outstanding under the
Indenture, according to their tenor and effect, and the performance of all of the provisions of the Indenture and of said bonds, hath granted, bargained, sold, released, conveyed, assigned, transferred, pledged, set over and confirmed and by these
presents doth grant, bargain, sell, release, convey, assign, transfer, pledge, set over and confirm unto Deutsche Bank Trust Company Americas, as Trustee, and to its successor or successors in said trust, and to it and their assigns forever, all the
properties of the Company located in the State of Illinois described on page 11 under the heading “Detailed Description of Additional Properties,” which is made a part hereof. 
 And all other real, personal and mixed, tangible and intangible of the character described in the granting clauses of the aforesaid Indenture of Mortgage
and Deed of Trust dated as of April 1, 1933 or in any indenture supplemental thereto acquired by the Company on or after the date of the execution and delivery of said Indenture of Mortgage and Deed of Trust (except any in said Indenture of
Mortgage and Deed of Trust or in any indenture supplemental thereto expressly excepted) now owned or hereafter acquired by the Company and wheresoever situated. 
 Together with all and singular the tenements, hereditaments and appurtenances belonging or in any wise appertaining to the aforesaid property or any part thereof, with the reversion and reversions, remainder and
remainders and (subject to the provisions of Article XI of the 

  

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Indenture) the tolls, rents, revenues, issues, earnings, income, product and profits thereof, and all the estate, right, title and interest and claim
whatsoever, at law as well as 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. 
 To Have and to Hold all such properties, real, personal and mixed, mortgaged, pledged or conveyed by the Company as aforesaid, or intended so to be, unto
the Trustee and its successors and assigns forever. 
 In Trust, Nevertheless, upon the terms and trusts of the Indenture, for those who
shall hold the bonds and coupons issued and to be issued thereunder, or any of them, without preference, priority or distinction as to lien of any of said bonds and coupons over any others thereof by reason of priority in the time of the issue or
negotiation thereof, or otherwise howsoever, subject, however, to the provisions in reference to extended, transferred or pledged coupons and claims for interest set forth in the Indenture (and subject to any sinking funds that may be created for
the benefit of any particular series). 
 Provided, However, and these presents are upon the condition that, if the Company, its
successors or assigns, shall pay or cause to be paid, the principal of and interest on said bonds, at the times and in the manner stipulated therein and herein, and shall keep, perform and observe all and singular the covenants and promises in said
bonds and in the Indenture expressed to be kept, performed and observed by or on the part of the Company, then this Supplemental Indenture and the estate and rights hereby granted shall cease, determine and be void, otherwise to be and remain in
full force and effect. 
 It Is Hereby Covenanted, Declared and Agreed by the Company that all such bonds and coupons, if any, are to be
issued, authenticated and delivered, and that all property subject or to become subject hereto is to be held, subject to the further covenants, conditions, uses and trusts in the Indenture set forth, and the Company, for itself and its successors
and assigns, does hereby covenant and agree to and with the Trustee and its successor or successors in such trust, for the benefit of those who shall hold said bonds and interest coupons, or any of them, as follows: 
 Section 1. The bonds of the 2009 Credit Agreement Series shall mature, subject to prior acceleration and redemption, on the Commitment
Termination Date (having at any time the meaning such term has at such time under the Credit Agreement) of the Company, shall bear interest from their date as set forth in the form of bond hereinbefore set forth, and shall be designated as the
Company’s First Mortgage Bonds of the series hereinbefore set forth. Both principal of and interest on the bonds shall be payable in lawful money of the United States of America at the office of the Trustee hereinafter mentioned. 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.

 Definitive bonds of the 2009 Credit Agreement Series will be issued, originally or otherwise, only as registered bonds without coupons in
the name of the Agent as evidence of and security for the Company Obligations under the Credit Agreement; and they and the Trustee’s certificate of authentication shall be substantially in the forms hereinbefore recited, respectively.

  

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 The bonds of the 2009 Credit Agreement Series shall not be assignable or transferable except to a
successor Agent appointed in accordance with the Credit Agreement. Subject to the restriction on transfer of the bonds of the 2009 Credit Agreement Series hereinbefore set forth, and in the manner and upon payment of the charges prescribed in the
Indenture, registered bonds without coupons of the 2009 Credit Agreement Series may be exchanged for a like aggregate principal amount of fully registered bonds of other authorized denominations of the same series, upon presentation and surrender
thereof for cancellation, to the Trustee at its principal office in the Borough of Manhattan, The City of New York, New York; provided, that the Company shall not be required to exchange any bonds of the 2009 Credit Agreement Series for a
period of ten (10) days next preceding an Interest Payment Date with respect to such bonds. However, notwithstanding the provisions of Section 14 of the Indenture, no charge shall be made upon any transfer or exchange of bonds of said
series other than for any tax or taxes or other governmental charge required to be paid by the Company. 
 Except as set forth herein, the
bonds of the 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 the 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 the 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 2. The principal amount of bonds of the 2009 Credit Agreement Series outstanding from time to time shall always be equal to
$150,000,000 or such lesser 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 $150,000,000. 
 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 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. 
  

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 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 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. 
 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. 
 At any time that a bond of the 2009
Credit Agreement Series is surrendered to the Trustee other than in connection with the redemption thereof, in connection with the Trustee’s enforcement of rights after a completed default under the Mortgage or in connection with the exchange
of that bond as provided in Section 1 hereof, such bond shall be cancelled by the Trustee and shall be treated for all intents and purposes as if it has never been issued. In the event that only a portion of a bond of the 2009 Credit Agreement
Series is so surrendered, the Trustee shall deliver without charge to the Agent a new bond of the 2009 Credit Agreement Series in an aggregate principal amount equal to the difference between the principal amount of the portion of the bond of the
2009 Credit Agreement Series so surrendered and the principal amount of such bond prior to such surrender. 
 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 of the Company 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. 
  

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 Section 3. As supplemented and amended by this Supplemental Indenture, the Indenture is in
all respects ratified and confirmed, and this Supplemental Indenture and all the terms and conditions herein contained shall be deemed a part thereof. 
 Section 4. Except as herein otherwise expressly provided, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Supplemental
Indenture, other than as set forth in the Indenture as heretofore amended and supplemented. The Trustee shall not be responsible for the recitals herein or in the bonds (other than in the authentication certificate of the Trustee), all of which are
made by the Company solely. 
 Section 5. 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. 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. 
 Section 7. The Company shall provide the Trustee with copies of the Credit Agreement and any amendments thereto as soon as practicable after
such Credit Agreement or amendment is entered into and the Trustee in performing its duties hereunder shall be entitled to rely on the latest copy of the Credit Agreement and any amendments thereto received from the Company. To the extent not
identified in the Credit Agreement or amendment, as provided in the preceding sentence, the Company will inform the Trustee of any change in the identity of the Agent and the Trustee shall be entitled to conclusively rely on the notice or
instructions received from the Agent pursuant to the Credit Agreement or amendment. 
 Detailed Description of Additional Properties 

 A PART OF THE WEST HALF OF THE SOUTHEAST QUARTER OF SECTION 26, TOWNSHIP TWENTY SEVEN NORTH, RANGE THREE WEST OF THE THIRD PRINCIPAL MERIDIAN MORE
PARTICULARY DESCRIBED AS FOLLOWS: 
 BEGINNING AT THE SOUTHEAST CORNER OF THE WEST HALF OF THE SOUTHEAST QUARTER OF SAID SECTION 26: THENCE
SOUTH 90-00’00” WEST (BEARING ASSUMED FOR THE PURPOSE OF DESCRIPTION ONLY) ALONG THE SOUTH LINE OF THE SOUTHEAST QUARTER OF SAID SECTION 26, 300.00 FEET; THENCE NORTH 00-32’-22” EAST, 300.00 FEET; THENCE NORTH
90-00’-00” EAST, 

  

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300.00 FEET TO THE EAST LINE OF THE WEST HALF OF THE SOUTHEAST QUARTER OF SAID SECTION 26; THENCE SOUTH 00-32’-22” WEST ALONG SAID EAST LINE,
300.00 FEET; TO THE POINT OF BEGINNING, SAID TRACT CONTAINING 2.066 ACRES, MORE OR LESS, SUBJECT TO THAT PORTION USED AS A PUBLIC ROAD RIGHT OF WAY, ALONG THE SOUTH SIDE OF SAID TRACT, SITUATE LYING, AND BEING IN THE COUNTY OF WOODFORD AND STATE OF
ILLINOIS. 
 Part P.I.N. # 08-26-400-006 
  

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 IN WITNESS WHEREOF, Central Illinois Light Company, party of the first part hereto, and Deutsche Bank
Trust Company Americas, party of the second part hereto, have caused these presents to be executed in their respective names by their respective Presidents or one of their Vice Presidents or one of their Assistant Vice Presidents and their
respective seals to be hereunto affixed and attested by their respective Secretaries or one of their Assistant Secretaries or one of their Associates, all as of the day and year first above written. 
  

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

  

					
	 [Seal]
 Attest:

		
		 	/s/ Craig W. Stensland
		 	Name:	 	Craig W. Stensland
		 	Title:	 	Assistant Secretary

			
	Deutsche Bank Trust Company Americas, as Trustee
	
	By Deutsche Bank National Trust Company
		
	By	 	/s/ Irina Golovashchuk
	Name:	 	Irina Golovashchuk
	Title:	 	Assistant Vice President
		
	By	 	/s/ David Contino
	Name:	 	David Contino
	Title:	 	Vice President

  

					
	 [Seal]
 Attest:

		
		 	/s/ Chris Niesz
		 	Name:	 	Chris Niesz
		 	Title:	 	Associate

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

 I, Carla J. Flinn, a Notary Public, do hereby certify that Jerre E. Birdsong, Vice President and
Treasurer of Central Illinois Light Company, a corporation organized and existing under the laws of the State of Illinois, and Craig W. Stensland, 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/ Carla J. Flinn
	Notary Public

 (Notarial Seal) 
 Commission # 06399906 
 My Commission expires 4/20/2010 

					
	State of New Jersey	  	)	  	
		  	)	  	SS
	County of Monmouth	  	)	  	

 I, Jeffrey Schoenfeld, a Notary Public in and for Union County in the State aforesaid, do hereby
certify that: 
 Irina Golovashcuk, an Assistant Vice President of Deutsche Bank National Trust Company, signing on behalf of
Deutsche Bank Trust Company America, and David Contino , a Vice President 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. 
  

	
	/s/ Jeffrey Schoenfeld
	Notary Public

 (Notarial Seal) 
 My Commission expires August 17, 2012Ameren IP - Supplmental Indenture

 Exhibit 4.3 
 WHEN RECORDED MAIL TO: 
 Illinois Power Company 
 Craig W. Stensland 
 One Ameren Plaza (MC 1310) 
 1901 Chouteau Avenue 
 St. Louis, Missouri 63103 
  
  
  
 ILLINOIS POWER COMPANY 
 TO 
 THE BANK OF NEW YORK MELLON TRUST
COMPANY, N.A. 
 formerly 
 BNY
Midwest Trust Company, As Successor Trustee To Harris Trust And Savings Bank 
  
  
 SUPPLEMENTAL INDENTURE

 DATED AS OF JUNE 15, 2009 
 TO

 GENERAL MORTGAGE INDENTURE AND DEED OF TRUST 
 DATED AS OF NOVEMBER 1, 1992 
  
  

 
 This instrument was prepared by Steven R. Sullivan, Senior
Vice President, General Counsel and Secretary of Illinois Power Company c/o Ameren Corporation, One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, Missouri 63103. 

 SUPPLEMENTAL INDENTURE dated as of June 15, 2009 (“Supplemental Indenture”), made by and
between ILLINOIS POWER COMPANY, a corporation organized and existing under the laws of the State of Illinois (the “Company”), party of the first part, and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., a national banking corporation,
formerly BNY Midwest Trust Company, a corporation organized and existing under the laws of the State of Illinois, as successor trustee to Harris Trust and Savings Bank, a corporation organized and existing under the laws of the State of Illinois
(the “Trustee”), as Trustee under the General Mortgage Indenture and Deed of Trust dated as of November 1, 1992, hereinafter mentioned, party of the second part; 
 WHEREAS, the Company has heretofore executed and delivered its General Mortgage Indenture and Deed of Trust dated as of November 1, 1992 as from
time to time amended and supplemented (the “Indenture”), to the Trustee, for the security of the Bonds of the Company issued and to be issued thereunder (the “Bonds”); and 
 WHEREAS, pursuant to the terms and provisions of the Indenture there were created and authorized by supplemental indentures thereto bearing the following
dates, respectively, the Mortgage Bonds of the series issued thereunder and respectively identified opposite such dates: 
  

					
	 DATE OF 
SUPPLEMENTAL INDENTURE
	  	 IDENTIFICATION OF SERIES
	  	 CALLED

			
	February 15, 1993	  	8% Series due 2023 (redeemed)	  	Bonds of the 2023 Series
			
	March 15, 1993	  	6 1/8% Series due 2000 (paid at maturity)	  	Bonds of the 2000 Series
			
	March 15, 1993	  	6 3/4% Series due 2005 (paid at maturity)	  	Bonds of the 2005 Series
			
	July 15, 1993	  	7 1/2% Series due 2025 (redeemed)	  	Bonds of the 2025 Series
			
	August 1, 1993	  	6 1/2% Series due 2003 (paid at maturity)	  	Bonds of the 2003 Series
			
	October 15, 1993	  	5 5/8% Series due 2000 (paid at maturity)	  	Bonds of the Second 2000 Series
			
	November 1, 1993	  	Pollution Control Series M (redeemed)	  	Bonds of the Pollution Control Series M
			
	November 1, 1993	  	Pollution Control Series N (redeemed)	  	Bonds of the Pollution Control Series N
			
	November 1, 1993	  	Pollution Control Series O (redeemed)	  	Bonds of the Pollution Control Series O

  

 -2- 

					
	 DATE OF 
SUPPLEMENTAL INDENTURE
	  	 IDENTIFICATION OF SERIES
	  	 CALLED

			
	April 1, 1997	  	Pollution Control Series P	  	Bonds of the Pollution Control Series P
			
	April 1, 1997	  	Pollution Control Series Q	  	Bonds of the Pollution Control Series Q
			
	April 1, 1997	  	Pollution Control Series R	  	Bonds of the Pollution Control Series R
			
	March 1, 1998	  	Pollution Control Series S	  	Bonds of the Pollution Control Series S
			
	March 1, 1998	  	Pollution Control Series T	  	Bonds of the Pollution Control Series T
			
	July 15, 1998	  	6 1/4% Series due 2002 (paid at maturity)	  	Bonds of the 2002 Series
			
	September 15, 1998	  	6% Series due 2003 (paid at maturity)	  	Bonds of the Second 2003 Series
			
	June 15, 1999	  	7.50% Series due 2009	  	Bonds of the 2009 Series
			
	July 15, 1999	  	Pollution Control Series U	  	Bonds of the Pollution Control Series U
			
	July 15, 1999	  	Pollution Control Series V (redeemed)	  	Bonds of the Pollution Control Series V
			
	May 1, 2001	  	Pollution Control Series W	  	Bonds of the Pollution Control Series W
			
	May 1, 2001	  	Pollution Control Series X	  	Bonds of the Pollution Control Series X
			
	July 1, 2002	  	10 5/8% Series due 2007 (not issued)	  	Bonds of the 2007 Series
			
	July 1, 2002	  	10 5/8% Series due 2012 (not issued)	  	Bonds of the 2012 Series
			
	December 15, 2002	  	11.50% Series due 2010	  	Bonds of the 2010 Series

  

 -3- 

					
			
	June 1, 2006	  	Mortgage Bonds, Senior Notes Series AA	  	Bonds of Series AA
			
	August 1, 2006	  	Mortgage Bonds, 2006 Credit Agreement Series Bonds (redeemed)	  	2006 Credit Agreement Series Bonds
			
	March 1, 2007	  	Mortgage Bonds, 2007 Credit Agreement Series Bonds (redeemed)	  	2007 Credit Agreement Series Bonds
			
	November 15, 2007	  	Mortgage Bonds, Senior Notes Series BB	  	Bonds of Series BB
			
	April 1, 2008	  	Mortgage Bonds, Senior Notes Series CC	  	Bonds of Series CC
			
	October 1, 2008	  	Mortgage Bonds, Senior Notes Series DD	  	Bonds of Series DD

 and 
 WHEREAS, a supplemental indenture with respect to the Bonds of the 2007 Series and the Bonds of the 2012 Series listed above was executed and filed but such Bonds of the 2007 Series and Bonds of the 2012 Series were never issued and a
release with respect to such supplemental indenture was subsequently executed and filed; and 
 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 Central Illinois Public Service 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 desires to create a new series of Bonds to be issued
under the Indenture to be known as Mortgage Bonds, 2009 Credit Agreement Series (the “2009 Credit Agreement Series Bonds”); and 
 WHEREAS, the 2009 Credit Agreement Series Bonds shall be issued to the Agent as evidence of and security for the Company Obligations under the Credit Agreement; and 
 WHEREAS, the Company, in the exercise of the powers and authority conferred upon and reserved to it under the provisions of the Indenture, and pursuant
to appropriate resolutions of the Board of Directors, has duly resolved and determined to make, execute and deliver to the Trustee this Supplemental Indenture in the form hereof for the purposes herein provided; and 
  

 -4- 

 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 SUPPLEMENTAL INDENTURE 
 WITNESSETH: 
 THAT Illinois Power Company, in consideration of the purchase and ownership from time to time of the Bonds and the service by the Trustee, and its
successors, under the Indenture and of One Dollar to it duly paid by the Trustee at or before the ensealing and delivery of these presents, the receipt whereof is hereby acknowledged, hereby covenants and agrees to and with the Trustee and its
successors in the trust under the Indenture, for the benefit of those who shall hold the Bonds as follows: 
 ARTICLE I 
 DESCRIPTION OF 2009 CREDIT AGREEMENT SERIES BONDS. 
 SECTION 1. The Company hereby creates a new series of Bonds to be known as “2009 Credit Agreement Series Bonds.” The 2009 Credit Agreement Series Bonds 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, as amended and supplemented. The 2009 Credit Agreement Series Bonds shall be issued only to and in the name of
the Agent under the Credit Agreement to evidence and secure any and all Company Obligations under the Credit Agreement. 
 The 2009 Credit
Agreement Series Bonds 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 2009 Credit Agreement Series Bonds shall be issued in the aggregate principal amount of $350,000,000 and shall mature on the Commitment Termination
Date (having at any time the meaning such term has at such time under the Credit Agreement) applicable to the Company. 
 The 2009 Credit
Agreement Series Bonds shall bear interest from their date as set forth in the form thereof hereinafter recited. Interest on the 2009 Credit Agreement Series Bonds shall be payable on each Interest Payment Date (defined below), commencing on the
first Interest Payment Date next succeeding the date of the 2009 Credit Agreement Series Bonds. Payment of principal on the 2009 Credit Agreement Series Bonds shall be due on the 

  

 -5- 

 
Commitment Termination Date. 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 2009 Credit Agreement Series Bonds 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. 
 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 (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 (a) that timely payment of principal of or interest on the 2009 Credit Agreement Series Bonds
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. 

 

 -6- 

 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. 
 The 2009 Credit Agreement Series Bonds shall not be assignable or transferable except to a successor Agent appointed in accordance with the Credit
Agreement. The 2009 Credit Agreement Series Bonds 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 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 2009 Credit Agreement Series Bonds for a period of ten (10) days next preceding an Interest Payment Date with respect to such bonds.

 As provided in Section 8.4 of the Credit Agreement, the Agent shall surrender the 2009 Credit Agreement Series Bonds to the Trustee
for cancellation when each of the Borrower Sublimit and the Borrower Credit Exposure of the Company 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. 
 SECTION 2. The 2009 Credit Agreement Series Bonds and the Trustee’s Certificate of
Authentication shall be substantially in the following forms respectively: 
 [FORM OF FACE OF BOND] 
 ILLINOIS POWER COMPANY 
 (Incorporated
under the laws of the State of Illinois) 
 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. 
 MORTGAGE BONDS, 2009 CREDIT AGREEMENT SERIES 
  

				
	 No. ________
	  	$	350,000,000

  

 -7- 

 ILLINOIS POWER COMPANY, a corporation organized and existing under the laws of the State of Illinois (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 JPMorgan Chase Bank, N.A., as 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 Central Illinois Public Service Company, 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 sum of $350,000,000 or such lesser principal amount as shall be
equal to the amount of 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 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 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. 
  

 -8- 

 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 this Bond 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 this Bond 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 this Bond, 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 this Bond 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. 
 The Agent shall surrender this Bond to the Trustee when each of the Borrower
Sublimit and the Borrower Credit Exposure of the Company 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 entitled to any benefit under the Indenture or any indenture supplemental thereto, or become valid or obligatory for any
purpose, until the form of certificate endorsed hereon shall have been signed by or on behalf of The Bank of New York Mellon Trust Company, N.A., formerly BNY Midwest Trust Company, as successor trustee to Harris Trust and Savings Bank, the Trustee
under the Indenture, or a successor trustee thereto under the Indenture (the “Trustee”). 
  

 -9- 

 The provisions of this Bond are continued on the reverse hereof and such continued provisions shall for
all purposes have the same effect as though fully set forth at this place. 
 IN WITNESS WHEREOF, Illinois Power Company has caused this Bond
to be signed (manually or by facsimile signature) in its name by an Authorized Executive Officer, as defined in the aforesaid Indenture, and attested (manually or by facsimile signature) by an Authorized Executive Officer, as defined in such
Indenture on the date hereof. 
 Dated June [__], 2009 
  

			
	ILLINOIS POWER COMPANY
		
	By:	 	 
		 	AUTHORIZED EXECUTIVE OFFICER

  

			
	ATTEST:
		
	By:	 	 
		 	AUTHORIZED EXECUTIVE OFFICER

 [FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION] 
 This is one of the Bonds of the series designated therein referred to in the within-mentioned Indenture and the Supplemental Indenture dated as of
June 15, 2009. 
  

			
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., Formerly, BNY Midwest Trust Company, successor trustee to Harris Trust and Savings Bank,
	TRUSTEE,
		
	By:	 	 
		 	AUTHORIZED SIGNATORY

 [FORM OF REVERSE OF BOND] 
 This Bond is one of a duly authorized issue of Bonds of the Company (the “Bonds”) in unlimited aggregate principal amount, of the series
hereinafter specified, all issued and to be issued under and equally secured by the General Mortgage Indenture and Deed of Trust (the “Indenture”), dated as of November 1, 1992, executed by the Company to The Bank of New York Mellon
Trust Company, N.A., formerly BNY Midwest Trust Company, as successor 

  

 -10- 

 
trustee to Harris Trust and Savings Bank (the “Trustee”), 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 registered owners of the Bonds and of the Trustee in respect thereof, 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 provided in the Indenture. This Bond is one of a series designated as the
“Mortgage Bonds, 2009 Credit Agreement Series” (the “2009 Credit Agreement Series Bonds”) of the Company, in an aggregate principal amount of $350,000,000 issued under and secured by the Indenture and described in the
Supplemental Indenture dated as of June 15, 2009 (the “Supplemental Indenture of June 15, 2009”), between the Company and the Trustee, supplemental to the Indenture. 
 This 2009 Credit Agreement Series 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 an Event of
Default, as defined in the Indenture, shall occur, the principal of all 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 be rescinded under certain circumstances. 
 ARTICLE II 
 REDEMPTION. 
 SECTION 1. Except as set
forth herein, the 2009 Credit Agreement Series Bonds are not redeemable. Upon the occurrence of a Default by the Company under the Credit Agreement and the acceleration of the Company Obligations, the 2009 Credit Agreement Series Bonds 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 2009 Credit Agreement Series Bonds (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 2009 Credit Agreement Series Bonds by the Agent to the Trustee, the 2009 Credit Agreement Series Bonds shall be redeemed at a redemption price equal to the aggregate amount of the Company Obligations. 
  

 -11- 

 ARTICLE III 
 ISSUE OF 2009 CREDIT AGREEMENT SERIES BONDS. 
 SECTION 1. The Company hereby exercises the right to
obtain the authentication of $350,000,000 principal amount of additional Bonds pursuant to the terms of Section 4.04 of the Indenture, all of which shall be 2009 Credit Agreement Series Bonds. 
 SECTION 2. Such 2009 Credit Agreement Series Bonds may be authenticated and delivered prior to the filing for recordation of this Supplemental Indenture.

 ARTICLE IV 
 THE
TRUSTEE. 
 The Trustee hereby accepts the trusts hereby declared and provided, and agrees to perform the same upon the terms and
conditions in the Indenture set forth and upon the following terms and conditions: 
 The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or the due execution hereof by the Company 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 Eleven of the Indenture shall apply to this Supplemental Indenture with the same force and effect as if the same were herein set forth in full, with such omissions, variations and
modifications thereof as may be appropriate to make the same conform to this Supplemental Indenture. 
 ARTICLE V 
 MISCELLANEOUS PROVISIONS. 
 This
Supplemental Indenture may be simultaneously executed in any number of counterparts, each of which when so executed shall be deemed to be an original; but such counterparts shall together constitute but one and the same instrument. 
 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. 
  

 -12- 

 IN WITNESS WHEREOF, said Illinois Power Company has caused this Supplemental
Indenture to be executed on its behalf by an Authorized Executive Officer as defined in the Indenture, and this Supplemental Indenture to be attested by an Authorized Executive Officer as defined in the Indenture; and said The Bank of New York
Mellon Trust Company, N.A., formerly BNY Midwest Trust Company, as successor trustee to Harris Trust and Savings Bank, in evidence of its acceptance of the trust hereby created, has caused this Supplemental Indenture to be executed on its behalf by
its President or one of its Vice Presidents and this Supplemental Indenture to be attested by its Secretary or one of its Vice Presidents; all as of the 15th day of June, 2009. 
  

			
	ILLINOIS POWER COMPANY
		
	By:	 	/s/ Jerre E. Birdsong
	Name: Jerre E. Birdsong
	Title: Vice President and Treasurer

  

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

			
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., Formerly, BNY Midwest Trust Company, successor trustee to Harris Trust and Savings Bank,
	TRUSTEE
		
	By:	 	/s/ M. Callahan
		 	AUTHORIZED SIGNATORY

  

			
	ATTEST:
		
	By:	 	/s/ L. Garcia
	Name: L. Garcia
	Title: Vice President

			
	STATE OF MISSOURI	  	)
		  	)        SS.
	CITY OF ST. LOUIS	  	)

 BE IT REMEMBERED, that on this 22nd day of June, 2009, before me, the undersigned, a Notary Public within and for the City and State aforesaid,
personally came Jerre E. Birdsong, Vice President and Treasurer and G. L. Waters, Assistant Secretary, of Illinois Power Company, a corporation duly organized, incorporated and existing under the laws of the State of Illinois, 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 that they signed and delivered the said instrument as their
free and voluntary act as such officers and as the free and voluntary act of said Illinois Power Company for the uses and purposes therein set forth. 
 IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal on the day and year last above written. 
  

			
	By:	 	/s/ Carolyn J. Shannon
		 	NOTARY PUBLIC

 My Commission Expires on 3/2/2012. 
 (NOTARIAL SEAL) 

			
	STATE OF ILLINOIS )	  	)
		  	)        SS.
	COUNTY OF COOK	  	)

 BE IT REMEMBERED, that on this 22nd day of June, 2009, before me, the undersigned, a Notary Public within and for the County and State aforesaid,
personally came M. Callahan, Authorized Signatory and L. Garcia, Vice President, of The Bank of New York Mellon Trust Company, N.A., formerly BNY Midwest Trust Company, a corporation duly organized, incorporated and existing under the laws of the
State of Illinois, 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 that they signed, sealed and delivered the said instrument as their free and
voluntary act as such officers, and as the free and voluntary act of said The Bank of New York Mellon Trust Company, N.A., for the uses and purposes therein set forth. 
 IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal on the day and year last above written. 
  

			
	By:	 	/s/ T. Mosterd
		 	NOTARY PUBLIC, COOK COUNTY, ILLINOIS

 My Commission Expires on 1/22/2013 
 (NOTARIAL SEAL)

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