Supplemental Indenture



 Exhibit 4.5 
 WHEN RECORDED MAIL TO: 
 Ameren Illinois Company 

Craig W. Stensland 
 One Ameren Plaza (MC 1310)

 1901 Chouteau Avenue 
 St. Louis, MO
63103 
 AMEREN ILLINOIS COMPANY 
 (SUCCESSOR TO ILLINOIS POWER COMPANY) 
 TO 

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 
 AS SUCCESSOR TRUSTEE TO 
 HARRIS TRUST AND SAVINGS BANK 

 
  

SUPPLEMENTAL INDENTURE 
 DATED AS OF AUGUST 1, 2012 
 TO 

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

 
 This instrument was prepared by Gregory L. Nelson,
Esq., Senior Vice President, General Counsel and Secretary of Ameren Illinois Company c/o Ameren Corporation, One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, Missouri 63103. 

 
  







 SUPPLEMENTAL INDENTURE dated as of August 1, 2012 (this “Supplemental
Indenture”), made by and between AMEREN ILLINOIS COMPANY (formerly named Central Illinois Public Service Company (“CIPS”) and successor to Illinois Power Company (“IP”) pursuant to the Merger, as defined
below), a corporation organized and existing under the laws of the State of Illinois (hereinafter sometimes called the “Company”), party of the first part, and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., a national banking
association organized and existing under the laws of the United States, as successor trustee to Harris Trust and Savings Bank, as Trustee (the “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 issued and to be issued
thereunder (the “Bonds”); and 
 WHEREAS, as of 12:01 a.m. Central Time (the “Effective
Time”) on October 1, 2010, pursuant to the Agreement and Plan of Merger dated as of April 13, 2010 among CIPS, IP and Central Illinois Light Company (“CILCO”), IP and CILCO were merged with and into the Company
(the “Merger”) whereby the Company is the surviving corporation; and 
 WHEREAS, pursuant to Sections
13.01 and 14.01(a) of the Indenture, the Company and the Trustee executed the Supplemental Indenture dated as of October 1, 2010 whereby, among other things, the Company (a) assumed the due and punctual payment of the principal of and
premium, if any, and interest, if any, on all of the Bonds then Outstanding and the performance and observance of every covenant and condition of the Indenture to be performed or observed by IP and (b) subjected to the Lien of the Indenture all
equipment and fixtures (other than Excepted Property, which is expressly excepted and excluded from the Lien of the Indenture) that were owned by CIPS immediately prior to the Effective Time and were of the same kind and character as the Mortgaged
Property immediately prior to the Effective Time; and 
 WHEREAS, pursuant to Sections 13.02 and 14.01(a)(i) of the
Indenture, the Company has succeeded to, and has been substituted for, and may exercise every right and power of, IP under the Indenture with the same effect as if the Company had been named the “Company” in the Indenture; and 

WHEREAS, pursuant to Section 14.01(a) of the Indenture, the Company and the Trustee executed 59 Supplemental Indentures dated
as of January 15, 2011 subjecting to the Lien of the Indenture certain real property that was owned by CIPS immediately prior to the Merger; 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









					
	 DATE OF

SUPPLEMENTAL
 INDENTURE
	  	 IDENTIFICATION OF SERIES
	  	 CALLED

	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
			
	April 1, 1997	  	Pollution Control Series P (retired)	  	Bonds of the Pollution Control Series P
			
	April 1, 1997	  	Pollution Control Series Q (retired)	  	Bonds of the Pollution Control Series Q
			
	April 1, 1997	  	Pollution Control Series R (retired)	  	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 (paid at maturity)	  	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 (retired)	  	Bonds of the Pollution Control Series W
			
	May 1, 2001	  	Pollution Control Series X (retired)	  	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 (redeemed)	  	Bonds of the 2010 Series
			
	June 1, 2006	  	Mortgage Bonds, Senior Notes Series AA	  	Bonds of Series AA
			
	August 1, 2006	  	Mortgage Bonds, 2006 Credit Agreement Series Bonds (retired)	  	2006 Credit Agreement Series Bonds


  
 2 









					
	 DATE OF

SUPPLEMENTAL
 INDENTURE
	  	 IDENTIFICATION OF SERIES
	  	 CALLED

	March 1, 2007	  	Mortgage Bonds, 2007 Credit Agreement Series Bonds (retired)	  	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
			
	June 15, 2009	  	Mortgage Bonds, 2009 Credit Agreement Series Bonds (retired)	  	2009 Credit Agreement Series Bonds
			
	October 1, 2010	  	Mortgage Bonds, Senior Notes Series CIPS-AA	  	Series CIPS-AA Mortgage Bonds
			
	October 1, 2010	  	Mortgage Bonds, Senior Notes Series CIPS-BB (retired)	  	Series CIPS-BB Mortgage Bonds
			
	October 1, 2010	  	Mortgage Bonds, Senior Notes Series CIPS-CC	  	Series CIPS-CC Mortgage Bonds

 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, pursuant to Section 14.01(a) of the Indenture, the Company elects to subject to the Lien of the Indenture certain franchises, permits, licenses, easements and rights of way; and

 WHEREAS, the Company desires to create a new series of Bonds to be issued under the Indenture to be known as
“First Mortgage Bonds, Senior Notes Series EE” (the “Series EE Mortgage Bonds”); and 

WHEREAS, the Company (as successor to IP) has entered into an Indenture dated as of June 1, 2006 (as amended and
supplemented, the “Senior Note Indenture”) with The Bank of New York Mellon Trust Company, N.A., as trustee (the “Senior Note Trustee”), providing for the issuance from time to time of senior notes thereunder; and

 WHEREAS, the Company desires by this Supplemental Indenture to issue to the Senior Note Trustee the Series EE
Mortgage Bonds as security for $400,000,000 aggregate principal amount of the Company’s 2.70% Senior Secured Notes due 2022 (the “Senior Notes”) to be issued under the Senior Note Indenture; 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

 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; 

  
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 NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH: 

THAT to secure the payment of the principal of, premium, if any, and interest on all Bonds issued and Outstanding under the Indenture
when payable in accordance with the provisions thereof and hereof, and to secure the performance by the Company of, and its compliance with, the covenants and conditions of the Indenture, and in consideration of the premises and of One Dollar paid
to the Company by the Trustee and pursuant to Section 14.01 of the Indenture, the Company does hereby grant, bargain, sell, release, convey, quitclaim, assign, transfer, mortgage, pledge, set over and confirm unto the Trustee, and to its
successors in trust and to its assigns, to the extent not already included in the Mortgaged Property, all of the Company’s franchises, permits, licenses, easements and rights of way that were owned by CIPS immediately prior to the Effective
Time and are transferable and necessary for the operation and maintenance of the Mortgaged Property, which shall be and are as fully granted and conveyed by the Indenture and as fully embraced within the Lien of the Indenture as if such property,
rights and interests in property were now owned by the Company and were specifically described herein and conveyed hereby; the Company expressly reserves the right, at any time and from time to time, by one or more supplemental indentures, to
subject to the Lien and operation of the Indenture any part or all of the Excepted Property upon such terms and conditions and subject to such restrictions, limitations and reservations as may be set for in such supplemental indenture or indentures;
together with all other property of whatever kind and nature subjected to or intended to be subjected to the Lien of the Indenture by any of the terms and provisions thereof. 
 TO HAVE AND TO HOLD all such properties, rights and interests in property granted, bargained, sold, warranted, released, conveyed, assigned, transferred, mortgaged, pledged, set over and confirmed
or in which a security interest has been granted by the Company in the Indenture or intended or agreed to be so granted, together with all the appurtenances thereto, unto the Trustee and its successors and assigns forever, 

SUBJECT, HOWEVER, to Permitted Liens and to Liens which have been granted by the Company to other Persons prior to the date of the
execution and delivery of this Supplemental Indenture, and subject also, as to any property hereafter acquired by the Company, to vendors’ Liens, purchase money mortgages and other Liens thereon at the time of the acquisition thereof
(including, but not limited to the Lien of any Prior Mortgage), it being understood that with respect to any of such property which is now or hereafter becomes subject to the Lien of any Prior Mortgage, the Lien of the Indenture shall at all times
be junior and subordinate to the Lien of such Prior Mortgage; 
 BUT IN TRUST, NEVERTHELESS, for the equal and
proportionate benefit and security of all present and future holders of the Bonds and any coupons issued and to be issued thereunder and secured by the Lien of the Indenture, and to secure the payment of the principal of, premium, if any, and
interest on the Bonds issued and Outstanding under the Indenture when payable in accordance with the provisions thereof and hereof, and to secure the performance of the Company, of, and its compliance with, the covenants and conditions of the
Indenture without any preference, priority or distinction of any one Bond over any other Bond by reason of priority in the issue or negotiation thereof or otherwise. 
 PROVIDED, HOWEVER, that if, after the right, title and interest of the Trustee in and to the Mortgaged Property shall have ceased and become void in accordance with Article Nine, then and in that
case the Indenture and the estate and rights thereby granted shall cease, terminate and be void, and the Trustee shall cancel and discharge the Indenture and execute and deliver to the Company such instruments as the Company shall require to
evidence the discharge thereof; otherwise the Indenture shall be and remain in full force and effect; and 
 IT IS HEREBY
COVENANTED AND AGREED, by and between the Company and the Trustee, that all Bonds and coupons, if any, are to be authenticated, delivered and issued, and that all Mortgaged Property 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 successor and assigns, hereby covenants and agrees to and with the Trustee and its successors in trust under the Indenture, for the benefit of those who shall hold
Bonds, as follows: 

  
 4 








 ARTICLE I 
 DESCRIPTION OF THE SERIES EE MORTGAGE BONDS 
 Section 1. The Company hereby
creates a new series of Bonds to be known as “First Mortgage Bonds, Senior Notes Series EE” (the “Series EE Mortgage Bonds”). The Series EE Mortgage 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 supplemented and modified. The Series EE Mortgage Bonds shall be issued in the name of the
Senior Note Trustee under the Senior Note Indenture to secure any and all of the Company’s obligations under the Senior Notes and any other series of senior notes from time to time outstanding under the Senior Note Indenture. 

The Series EE Mortgage Bonds shall be dated as provided in Section 3.03 of Article Three of the Indenture. The
Series EE Mortgage Bonds shall mature on September 1, 2022, shall accrue interest from the dates set forth in the Senior Notes and shall bear interest at the same rate of interest as the Senior Notes. Interest on the Series EE
Mortgage Bonds is payable on the same dates as interest on the Senior Notes is paid, until the principal sum is paid in full. 

Upon any payment of the principal of, premium, if any, and interest on, all or any portion of the Senior Notes, whether at maturity or
prior to maturity by redemption or otherwise or upon provision for the payment thereof having been made in accordance with Section 5.01(a) of the Senior Note Indenture, the Series EE Mortgage Bonds in a principal amount equal to the
principal amount of such Senior Notes shall, to the extent of such payment of principal, premium, if any, and interest, be deemed paid and the obligation of the Company thereunder to make such payment shall be discharged to such extent and, in the
case of the payment of principal (and premium, if any), such Series EE Mortgage Bonds shall be surrendered to the Company for cancellation as provided in Section 4.08 of the Senior Note Indenture. 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, premium, if any, and interest on the Senior Notes, so far as such payments at the time have become due, has been fully satisfied and
discharged pursuant to the foregoing sentence unless and until the Trustee shall have received a written notice from the Senior Note Trustee signed by one of its officers stating (i) the timely payment of principal, or premium, if any, or
interest on, the Senior Notes has not been made, (ii) that the Company is in arrears as to the payments required to be made by it to the Senior Note Trustee pursuant to the Senior Note Indenture, and (iii) the amount of the arrearage.


  
 5 








 Section 2. The Series EE Mortgage Bonds and the Trustee’s Certificate of
Authentication shall be substantially in the following forms respectively: 
 [FORM OF FACE OF BOND]

NOTWITHSTANDING ANY PROVISIONS HEREOF OR IN THE INDENTURE THIS BOND IS NOT 

ASSIGNABLE OR TRANSFERABLE EXCEPT AS PERMITTED BY SECTION 4.04 OF THE INDENTURE 

DATED AS OF JUNE 1, 2006, AS AMENDED AND SUPPLEMENTED, BETWEEN AMEREN ILLINOIS 

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

AMEREN ILLINOIS COMPANY 
 (Incorporated under the laws of the State of Illinois) 
 Illinois Commerce
Commission 
 Identification No.: Ill. C.C.             

 FIRST MORTGAGE BOND, SENIOR NOTES SERIES EE 

 

					
	 No.
	  	$	        	  

 AMEREN ILLINOIS 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 The Bank of New York Mellon Trust Company, N.A., as trustee (the
“Senior Note Trustee”) under the Indenture dated as of June 1, 2006 (as amended and supplemented, the “Senior Note Indenture”), relating to the Company’s 2.70% Senior Secured Notes due 2022 (the
“Senior Notes”) in the aggregate principal amount of $            , between the Company and the Senior Note Trustee, or registered assigns, the principal sum of
$             on September 1, 2022, 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, and to
pay interest thereon in like coin or currency from the date of issuance (and thereafter from the dates set forth in the Senior Notes), and at the same rate of interest as the Senior Notes. Interest on overdue principal, premium, if any, and, to
the extent permitted by law, on overdue interest, shall be payable at the interest rate payable on the Senior Notes. Interest on this Mortgage Bond is payable on the same dates as interest on the Senior Notes is paid, until the principal sum of
this Mortgage Bond is paid in full. Pursuant to Article IV of the Senior Note Indenture, this Mortgage Bond is issued to the Senior Note Trustee to secure any and all obligations of the Company under the Senior Notes and any other series
of senior notes from time to time outstanding under the Senior Note Indenture. Payment of principal of, or premium, if any, or interest on, the Senior Notes shall constitute payments on this Mortgage Bond as further provided herein and in the
Supplemental Indenture of August 1, 2012 (as hereinafter defined) pursuant to which this Mortgage Bond has been issued. Both the principal of, premium, if any, and the interest on, this Mortgage Bond are payable at the office of the Senior Note
Trustee. 
 Upon any payment of the principal of, premium, if any, and interest on, all or any portion of the Senior Notes,
whether at maturity or prior to maturity by redemption or otherwise or upon provision for the payment thereof having been made in accordance with Section 5.01(a) of the Senior Note Indenture, a principal amount of this Mortgage Bond equal
to the principal amount of such Senior Notes shall, to the extent of such payment of principal, premium, if any, and interest, be deemed paid and the obligation of the Company thereunder to make such payment shall be discharged to such extent and,
in the case of the payment of principal (and premium, if any), such Mortgage Bonds shall be surrendered to the Company for cancellation as provided in Section 4.08 of the Senior Note Indenture. The Trustee (as hereinafter defined) may at
any time and all times conclusively assume that the obligation of the Company to make payments with respect to the principal of, premium, if any, and interest on, the Senior Notes, so far as such payments at the time have become due, has been fully
satisfied and discharged pursuant to the foregoing sentence unless and until the Trustee shall have received a written notice from the Senior Note Trustee signed by one of its officers stating (i) that timely payment of principal of, premium,
if any, or interest on, the Senior Notes has not been made, (ii) that the Company is in arrears as to the payments required to be made by it to the Senior Note Trustee pursuant to the Senior Note Indenture, and (iii) the amount of the
arrearage. 

  
 6 








 For purposes of Section 4.09 of the Senior Note Indenture, this Mortgage Bond shall be
deemed to be the “Related Series of Senior Note Mortgage Bonds” in respect of the Senior Notes. 
 This Mortgage
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., as successor trustee to Harris Trust and Savings Bank, the Trustee under the Indenture, or a successor trustee thereto under the Indenture (the “Trustee”). 

The provisions of this Mortgage 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, Ameren Illinois Company has caused this Mortgage
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:	  	
		  	AMEREN ILLINOIS COMPANY
		
		  	By:                             
                                         
      
		  	        AUTHORIZED EXECUTIVE OFFICER
		
	ATTEST:	  	
		
	By:                             
                                         
      	  	
	        AUTHORIZED EXECUTIVE OFFICER	  	

 [FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION] 

This is one of the Mortgage Bonds of the series designated therein referred to in the within mentioned Indenture and the Supplemental
Indenture dated as of August 1, 2012. 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 

as successor trustee to 
 Harris Trust and Savings Bank, 
 TRUSTEE, 

By:                      
                                       

      AUTHORIZED SIGNATORY 

  
 7 








 [FORM OF REVERSE OF BOND] 

This Mortgage Bond is one of a duly authorized issue of Mortgage Bonds of the Company (the “Mortgage 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 (as amended and supplemented, the “Indenture”),
dated as of November 1, 1992, executed by the Company (as successor to Illinois Power Company) to The Bank of New York Mellon Trust Company, N.A., as successor trustee to Harris Trust and Savings Bank (the “Trustee”) to which
Indenture 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 Mortgage Bonds and of the Trustee in respect thereof, and the terms and
conditions upon which the Mortgage Bonds are, and are to be, secured. The Mortgage 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 Mortgage Bond is one of a series designated as the Series EE Mortgage Bonds of the Company, unlimited in aggregate principal amount, issued under and secured by the Indenture and described in the Supplemental
Indenture dated as of August 1, 2012 (the “Supplemental Indenture of August 1, 2012” ), between the Company and the Trustee, supplemental to the Indenture. 

This Series EE Mortgage Bond is subject to redemption in accordance with the terms of Article II of the Supplemental Indenture of
August 1, 2012. 
 This Mortgage Bond shall be governed by and construed in accordance with the laws of the State of
Illinois, except to the extent that the law of any other jurisdiction shall be mandatorily applicable. 
 In case an Event of
Default, as defined in the Indenture, shall occur, the principal of all Mortgage 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. The Series EE Mortgage Bonds are not redeemable except on the date, in the principal amount and for the redemption price that correspond to the redemption date for, the principal amount to
be redeemed of, and the redemption price for, the Senior Notes, and except as set forth in Section 2 of this Article. 
 In
the event that the Company redeems any Senior Notes prior to maturity in accordance with the provisions of the Senior Note Indenture, the Senior Note Trustee shall on the same date deliver to the Company the Series EE Mortgage Bonds in
principal amount corresponding to the Senior Notes so redeemed, as provided in Section 4.08 of the Senior Note Indenture. The Company agrees to give the Trustee notice of any such redemption of the Senior Notes on or before the date fixed
for any such redemption. 
 Section 2. Upon the occurrence of an Event of Default under the Senior Note Indenture (as defined
therein) and the acceleration of the Senior Notes, the Series EE Mortgage Bonds shall be redeemable in whole upon receipt by the Trustee (with a copy to the Company) of a written demand (hereinafter called a “EE Redemption
Demand”) from the Senior Note Trustee stating that there has occurred under the Senior Note Indenture both an Event of Default and a declaration of acceleration of payment of principal, accrued interest and premium, if any, on the Senior
Notes specifying the last date to which interest on such Senior Notes has been paid (such date being hereinafter referred to as the “EE Initial Interest Accrual Date”) and demanding redemption of the Series EE Mortgage
Bonds. The Company waives any right it may have to prior notice of such redemption under the Indenture. Upon surrender of the Series EE Mortgage Bonds by the Senior Note Trustee to the Trustee, the Series EE Mortgage Bonds shall
be redeemed at a redemption price equal to the principal amount thereof plus accrued interest thereon from the EE Initial Interest Accrual Date to the redemption date; provided, however, that in the event of a rescission or annulment of acceleration
of the Senior Notes pursuant to the last paragraph of Section 8.01(a) of the Senior Note Indenture, then any EE Redemption Demand shall thereby be deemed to be rescinded by the Senior Note Trustee although no such rescission or annulment
shall extend to or affect any subsequent default or impair any right consequent thereon. 

  
 8 








 ARTICLE III 
 ISSUE OF THE SERIES EE MORTGAGE BONDS 
 Section 1. The Company hereby
exercises the right to obtain the authentication of $400,000,000 principal amount of additional Bonds pursuant to the terms of Section 4.04 of the Indenture, all of which shall be Series EE Mortgage Bonds. The principal amount of the
Series EE Mortgage Bonds outstanding from time to time shall always be equal to the principal amount of the Senior Notes which are outstanding from time to time under the Senior Note Indenture and to the extent the Senior Note Trustee holds
Series EE Mortgage Bonds in excess of such principal amount, such Series EE Mortgage Bonds shall be deemed cancelled and retired and no longer outstanding under the Indenture. 

Section 2. Such Series EE Mortgage Bonds may be authenticated and delivered prior to the filing for recordation of this Supplemental
Indenture. 
 Section 3. For purposes of Section 4.09 of the Senior Note Indenture, the Series EE Mortgage Bonds shall
be deemed to be the “Related Series of Senior Notes Mortgage Bonds” in respect of the Senior Notes. 
 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 
 Except as otherwise defined herein, capitalized terms defined in the Indenture are used herein as therein defined. 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. 

  
 9 








 IN WITNESS WHEREOF, said Ameren Illinois Company has caused this Supplemental Indenture to
be executed on its behalf by an Authorized Executive Officer as defined in the Indenture, and its corporate seal to be hereto affixed and said seal 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., 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 one of its Vice Presidents and this Supplemental Indenture to be attested by its Secretary or one of its Vice Presidents; all as of August 1, 2012. 
 AMEREN ILLINOIS COMPANY 
 (CORPORATE SEAL) 

 

			
	By:	 	 /s/ Jerre E. Birdsong

		 	Name: Jerre E. Birdsong
		 	Title:   Vice President and Treasurer


 ATTEST: 
  

			
	By:	 	 /s/ Craig W. Stensland

		 	Name: Craig W. Stensland
		 	Title:   Assistant Secretary


  
 10 









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

successor trustee to 
 Harris Trust and Savings Bank, 
 TRUSTEE, 

 

			
	By:	 	 /s/ Richard Tarnas

		 	Name: Richard Tarnas
		 	Title:   Vice President


  

			
	ATTEST:
		
	By:	 	/s/ Linda Garcia
		 	Name: Linda Garcia
		 	Title:   Vice President


  
 11 










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

 BE IT REMEMBERED, that on this 10th day of August, 2012, 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 Craig W. Stensland, Assistant Secretary, of Ameren Illinois 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, sealed and delivered the said instrument as their free and voluntary act as such officers and as the free and voluntary act of said Ameren Illinois 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. 

 

			
		
		 	    /s/ Lynn M. Smith
		 	NOTARY PUBLIC


 My Commission Expires on 09/28/2014 
 (NOTARIAL SEAL) 
 Lynn M. Smith 
 Notary Public – Notary Seal 
 STATE OF MISSOURI 

Commission for St. Louis City 
 My Commission
Expires Sept. 28, 2014 
 Commission #10402618 

  
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	 STATE OF ILLINOIS
	  	)	  		  	
		  		  	ss.	  	
	 CITY OF COOK
	  	)	  		  	

 BE IT REMEMBERED, that on this 9th day of August, 2012, before me, the undersigned, a Notary Public
within and for the County and State aforesaid, personally came Richard Tarnas, Vice President and Linda Garcia, Vice President, of The Bank of New York Mellon Trust Company, N.A., a national banking association duly organized, incorporated and
existing under the laws of the United States, 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 Vice President and Vice President, 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. 

 

			
		
		 	/s/ Danita S. George
		 	NOTARY PUBLIC, COOK COUNTY, ILLINOIS


 My Commission Expires on 11/9/2013 
 (NOTARIAL SEAL) 
 Danita S. George 
 Notary Public 
 STATE OF ILLINOIS 
 My Commission Expires November 9, 2013 

  
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