Document:

Instrument of Assumption

 Exhibit 4.7 

INSTRUMENT OF ASSUMPTION 

Pollution Control Revenue Refunding Bonds, 

1998 Series A (Illinois Power Company Project) 

THIS INSTRUMENT OF ASSUMPTION, dated October 1, 2010, is entered into by AMEREN ILLINOIS COMPANY, an Illinois corporation (the
“Company”). 
 RECITALS 
  

	1.	Illinois Power Company, an Illinois corporation (“IP”), has heretofore entered into the Loan Agreement dated as of March 1, 1998 (the
“Agreement”), by and between the Illinois Development Finance Authority (now the ILLINOIS FINANCE AUTHORITY), a political subdivision, body politic and corporate duly organized and existing under and by virtue of the Constitution and laws
of the State of Illinois (the “Issuer”) and IP, pursuant to which IP is obligated to make certain payments related to the Pollution Control Revenue Refunding Bonds, 1998 Series A (Illinois Power Company Project) issued by the Issuer under
the Indenture of Trust dated as of March 1, 1998 (as heretofore and hereafter amended or supplemented, the “Indenture”), with Harris Trust and Savings Bank (succeeded in interest by The Bank of New York Mellon Trust Company, N.A.), as
Trustee (the “Trustee”). 

  

	2.	On the date hereof, IP merged into the Company. 

  

	3.	As required by Section 5.5 of the Agreement, (a) such merger is permitted under the Company Indenture (as defined in the Indenture), (b) the Company has
delivered to the Trustee an Opinion of Counsel to the effect that such merger and the assumption contained herein complies with Section 5.5 of the Agreement, and (c)(A) the surviving legal entity is organized and existing under the laws of the
State of Illinois and is qualified to do business in the State of Illinois and (B) no event which constitutes, or which with the giving of notice or the lapse of time or both would constitute an Event of Default Company has occurred and is
continuing immediately after such merger. 

  

	4.	Pursuant to the Agreement and Plan of Merger dated April 13, 2010 among Central Illinois Public Service Company (now the Company), Central Illinois Light Company
and IP, and Section 11.50 of the Illinois Business Corporation Act of 1983, the Company became responsible and liable for all the liabilities and obligations of IP when the merger became effective. 

 

	5.	This Instrument of Assumption is being executed pursuant to Section 5.5 of the Agreement. 

NOW, THEREFORE, BE IT KNOWN that, in consideration of the premises and of other good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, the Company DOES HEREBY ASSUME all of the obligations of IP under the Agreement and the Mortgage Bonds (as defined in the Indenture). 

 IN WITNESS WHEREOF, the Company has caused this Instrument to be executed as of the day and
year first above written. 
 AMEREN ILLINOIS COMPANY 

 

					
		 	By	 	 /s/ Martin J. Lyons, Jr.

		 	Name: Martin J. Lyons, Jr.

   Title: Senior Vice President and Chief Financial Officer 

 

 2Instrument of Assumption

 Exhibit 4.8 

INSTRUMENT OF ASSUMPTION 

Pollution Control Revenue Refunding Bonds, 

1998 Series B (Illinois Power Company Project) 

THIS INSTRUMENT OF ASSUMPTION, dated October 1, 2010, is entered into by AMEREN ILLINOIS COMPANY, an Illinois corporation (the
“Company”). 
 RECITALS 
  

	1.	Illinois Power Company, an Illinois corporation (“IP”), has heretofore entered into the Loan Agreement dated as of March 1, 1998 (the
“Agreement”), by and between the Illinois Development Finance Authority (now the ILLINOIS FINANCE AUTHORITY), a political subdivision, body politic and corporate duly organized and existing under and by virtue of the Constitution and laws
of the State of Illinois (the “Issuer”) and IP, pursuant to which IP is obligated to make certain payments related to the Pollution Control Revenue Refunding Bonds, 1998 Series B (Illinois Power Company Project) issued by the Issuer under
the Indenture of Trust dated as of March 1, 1998 (as heretofore and hereafter amended or supplemented, the “Indenture”), with Harris Trust and Savings Bank (succeeded in interest by The Bank of New York Mellon Trust Company, N.A.), as
Trustee (the “Trustee”). 

  

	2.	On the date hereof, IP merged into the Company. 

  

	3.	As required by Section 5.5 of the Agreement, (a) such merger is permitted under the Company Indenture (as defined in the Indenture), (b) the Company has
delivered to the Trustee an Opinion of Counsel to the effect that such merger and the assumption contained herein complies with Section 5.5 of the Agreement, and (c)(A) the surviving legal entity is organized and existing under the laws of the
State of Illinois and is qualified to do business in the State of Illinois and (B) no event which constitutes, or which with the giving of notice or the lapse of time or both would constitute an Event of Default Company has occurred and is
continuing immediately after such merger. 

  

	4.	Pursuant to the Agreement and Plan of Merger dated April 13, 2010 among Central Illinois Public Service Company (now the Company), Central Illinois Light Company
and IP, and Section 11.50 of the Illinois Business Corporation Act of 1983, the Company became responsible and liable for all the liabilities and obligations of IP when the merger became effective. 

 

	5.	This Instrument of Assumption is being executed pursuant to Section 5.5 of the Agreement. 

NOW, THEREFORE, BE IT KNOWN that, in consideration of the premises and of other good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, the Company DOES HEREBY ASSUME all of the obligations of IP under the Agreement and the Mortgage Bonds (as defined in the Indenture). 

 IN WITNESS WHEREOF, the Company has caused this Instrument to be executed as of the day and
year first above written. 
 AMEREN ILLINOIS COMPANY 

 

					
		 	By	 	 /s/ Martin J. Lyons, Jr.

		 	Name: Martin J. Lyons, Jr.

   Title: Senior Vice President and Chief Financial Officer 

Address: One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, MO 63103Supplement Indenture

 Exhibit 4.9

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 OCTOBER 1, 2010 

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 Ameren Illinois Company c/o Ameren Corporation, One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, Missouri 63103. 

 
  

 IP Mortgage Merger Supplemental Indenture 

SUPPLEMENTAL INDENTURE dated as of October 1, 2010 (“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, a corporation organized and existing under the laws of the State of Illinois, 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, IP 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, 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
			
	 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

					
	 DATE OF

SUPPLEMENTAL

INDENTURE
	  	 IDENTIFICATION OF SERIES
	  	 CALLED

			
	 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
			
	 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	  	2009 Credit Agreement Series 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 

 

 2 

 WHEREAS, subject to the provisions thereof, Section 13.01 of the Indenture
permits, among other things, the merger of IP into any corporation organized and existing under the laws of any State of the United States of America that executes and delivers to the Trustee an indenture supplemental to the Indenture, in form
recordable and satisfactory to the Trustee which 
 (i) in the case of a merger, contains an assumption by the
Successor Corporation of the due and punctual payment of the principal of and premium, if any, and interest, if any, on all 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 
 (ii) in the case of a merger, contains a grant, conveyance, transfer and
mortgage by the Successor Corporation, of the same tenor of the Granting Clause of the Indenture: 
 (A)
confirming the Lien of the Indenture on the Mortgaged Property (as constituted immediately prior to the time such merger became effective) and subjecting to the Lien of the Indenture all property, real, personal and mixed, thereafter acquired by the
Successor Corporation which shall constitute an improvement, extension or addition to the Mortgaged Property (as so constituted) or a renewal, replacement or substitution of or for any part thereof, and 

(B) at the election of the Successor Corporation, subjecting to the Lien of the Indenture such property, real, personal or
mixed, in addition to the property described in subclause (A) above, then owned or thereafter acquired by the Successor Corporation as the Successor Corporation shall, in its sole discretion, specify or describe therein; and 

WHEREAS, Section 13.01(b) of the Indenture further provides that the Lien confirmed or created by such grant, conveyance,
transfer and mortgage shall have force, effect and standing similar to those which the Lien of the Indenture would have had if IP had not been a party to such merger and had itself, after the time such merger became effective, purchased, constructed
or otherwise acquired the property subject to such grant, conveyance, transfer and mortgage. 
 WHEREAS, as of 12:01 a.m.
Central Time (the “Effective Time”) on the date hereof, 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 into the
Company (the “Merger”) whereby the Company is the surviving corporation; and 
 WHEREAS, the Merger is upon
such terms as shall fully preserve in all material respects the Lien and security of the Indenture and the rights and powers of the Trustee and the Holders of the Bonds thereunder; and 

WHEREAS, subject to the provisions thereof, Section 13.02 of the Indenture provides, among other things, that upon any merger
in accordance with Section 13.01 of the Indenture, the Successor Corporation, shall succeed to, and be substituted for, and may exercise every power and right of, IP under the Indenture with the same effect as if such Successor Corporation, had
been named as the “Company” therein, and 
 WHEREAS, subject to the provisions thereof, Section 13.03 of
the Indenture provides, among other things, that unless, in the case of a merger contemplated by Section 13.01 of the Indenture, the indenture supplemental to the Indenture contemplated in clause (ii) of Section 13.01(b), or any other
indenture, contains a grant, conveyance and mortgage by the Successor Corporation as described in subclause (B) thereof, neither the Indenture nor such supplemental indenture shall become or be required to become or be a Lien upon any of the
properties then owned or thereafter acquired by the Successor Corporation, except properties acquired from IP in or as a result of such merger and improvements, extensions and additions to such properties and renewals, replacements and substitutions
of or for any part or parts of such properties; and 
 WHEREAS, the Company hereby elects to subject to the Lien of the
Indenture certain property owned by CIPS immediately prior to the Merger and certain property acquired by the Company after the Merger; and 

WHEREAS, the Company desires to create three new series of Bonds to be issued under the Indenture to be known as “Mortgage
Bonds, Senior Notes Series CIPS-AA” (the “Series CIPS-AA Mortgage Bonds”), “Mortgage Bonds, Senior Notes Series CIPS-BB” (the “Series CIPS-BB Mortgage Bonds”), and “Mortgage Bonds, Senior
Notes Series CIPS-CC” (the “Series CIPS-CC Mortgage Bonds”); and 
  

 3 

 WHEREAS, 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 the Company
has succeeded to the rights and obligations of IP under the Senior Note Indenture; and 
 WHEREAS, the Company desires by
this Supplemental Indenture to issue to the Senior Note Trustee the Series CIPS-AA Mortgage Bonds as security for $60,000,000 aggregate principal amount of the Company’s Senior Notes Series CIPS-AA (the “Series CIPS-AA Notes”),
the Series CIPS-BB Mortgage Bonds as security for $150,000,000 aggregate principal amount of the Company’s Senior Notes Series CIPS-BB (the “Series CIPS-BB Notes”), and the Series CIPS-CC Mortgage Bonds as security for
$61,500,000 aggregate principal amount of the Company’s Senior Notes Series CIPS-CC (the “Series CIPS-CC 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; 

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 13.01 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, (a) the Mortgaged Property (as constituted immediately prior to the Effective Time), (b) 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 (c) all property, real, personal and mixed,
acquired by the Company after the Effective Time (other than Excepted Property, which is expressly excepted and excluded from the Lien of the Indenture) which constitutes an improvement, extension or addition to the Mortgaged Property (as so
constituted) or a renewal, replacement or substitution of or for any part thereof, 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. 

EXPRESSLY EXCEPTING any properties owned by CILCO immediately prior to the Merger and any other properties, whether now owned or
hereafter acquired by the Company, that are not specifically described in clauses (a), (b) or (c) of the foregoing granting clause of this Supplemental Indenture. 

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, 
  

 4 

 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: 

ARTICLE I 

ASSUMPTION OF INDENTURE 

Section 1. Assumption by Company. As of the date hereof, pursuant to Sections 13.01 and 14.01(a)(i) of the Indenture,
the Company hereby expressly assumes 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. 
 Section 2. Company Substituted. On and after the date hereof, pursuant to
Sections 13.02 and 14.01(a)(i) of the Indenture, the Company shall succeed to, and be 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 as the “Company”
in the Indenture. 
 ARTICLE II 

DESCRIPTION OF THE SERIES CIPS-AA MORTGAGE BONDS 

Section 1. The Company hereby creates a new series of Bonds to be known as “Mortgage Bonds, Senior Notes
Series CIPS-AA” (the “Series CIPS-AA Mortgage Bonds”). The Series CIPS-AA 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 CIPS-AA 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 Series CIPS-AA Notes and any other series of senior notes from time to time outstanding under the Senior Note Indenture. 

 

 5 

 The Series CIPS-AA Mortgage Bonds shall be dated as provided in Section 3.03 of
Article Three of the Indenture. The Series CIPS-AA Mortgage Bonds shall mature on December 15, 2028, shall accrue interest from the dates set forth in the Series CIPS-AA Notes and shall bear interest at the same rate of interest
as the Series CIPS-AA Notes. Interest on the Series CIPS-AA Mortgage Bonds is payable on the same dates as interest on the Series CIPS-AA 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 Series CIPS-AA 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 CIPS-AA Mortgage Bonds in a principal
amount equal to the principal amount of such Series CIPS-AA 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 CIPS-AA 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 Series CIPS-AA 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 Series CIPS-AA 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. 
 Section 2. The Series CIPS-AA 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, 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.          

MORTGAGE BOND, SENIOR NOTES SERIES CIPS-AA 
  

			
	No.	 	$60,000,000

 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 (the “Senior Note Indenture”), relating to the Company’s Senior
Notes Series CIPS-AA (the “Senior Notes”) in the aggregate principal amount of $60,000,000, between the Company and the Senior Note Trustee, or registered assigns, the principal sum of $60,000,000 on December 15, 2028, 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 October 1, 2010 (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. 
  

 6 

 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. 
 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

  

 7 

 [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 October 1, 2010. 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 

as successor trustee to 

Harris Trust and Savings Bank, 

TRUSTEE, 
  

			
	By:	 	  

AUTHORIZED SIGNATORY 

[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 (the “Indenture”), dated as of November 1, 1992, executed by
the Illinois Power Company (now the 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 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 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 CIPS-AA 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 October 1, 2010 (the “Supplemental Indenture of October 1, 2010” ), between the Company and the Trustee, supplemental to the Indenture. 

This Series CIPS-AA Mortgage Bond is subject to redemption in accordance with the terms of the Supplemental Indenture of
October 1, 2010. 
 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
III 
 REDEMPTION 

Section 1. The Series CIPS-AA 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 Series CIPS-AA Notes, and except as set forth in Section 2 of this Article. 

In the event that the Company redeems any Series CIPS-AA 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 CIPS-AA Mortgage Bonds in principal amount corresponding to the Series CIPS-AA 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 Series CIPS-AA Notes on or before the date fixed for any such redemption. 

 

 8 

 Section 2. Upon the occurrence of an Event of Default under the Senior Note
Indenture (as defined therein) and the acceleration of the Series CIPS-AA Notes, the Series CIPS-AA 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
“CIPS-AA 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 Series CIPS-AA Notes specifying the last date to which interest on such Series CIPS-AA Notes has been paid (such date being hereinafter referred to as the “CIPS-AA Initial Interest Accrual Date”) and demanding redemption of the
Series CIPS-AA Mortgage Bonds. The Company waives any right it may have to prior notice of such redemption under the Indenture. Upon surrender of the Series CIPS-AA Mortgage Bonds by the Senior Note Trustee to the Trustee, the
Series CIPS-AA Mortgage Bonds shall be redeemed at a redemption price equal to the principal amount thereof plus accrued interest thereon from the CIPS-AA Initial Interest Accrual Date to the redemption date; provided, however, that in the
event of a rescission or annulment of acceleration of the Series CIPS-AA Notes pursuant to the last paragraph of Section 8.01(a) of the Senior Note Indenture, then any CIPS-AA 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. 

ARTICLE IV 

ISSUE OF THE SERIES CIPS-AA MORTGAGE BONDS 

Section 1. The Company hereby exercises the right to obtain the authentication of $60,000,000 principal amount of additional
Bonds pursuant to the terms of Section 4.04 of the Indenture, all of which shall be Series CIPS-AA Mortgage Bonds. The principal amount of the Series CIPS-AA Mortgage Bonds outstanding from time to time shall always be equal to
the principal amount of the Series CIPS-AA Notes which are outstanding from time to time under the Senior Note Indenture and to the extent the Senior Note Trustee holds Series CIPS-AA Mortgage Bonds in excess of such principal amount, such
Series CIPS-AA Mortgage Bonds shall be deemed cancelled and retired and no longer outstanding under the Indenture. 

Section 2. Such Series CIPS-AA 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 CIPS-AA Mortgage Bonds shall be deemed to be the “Related Series of Senior Notes Mortgage Bonds” in respect of the Series CIPS-AA Notes. 

ARTICLE V 

DESCRIPTION OF THE SERIES CIPS-BB MORTGAGE BONDS 

Section 1. The Company hereby creates a new series of Bonds to be known as “Mortgage Bonds, Senior Notes
Series CIPS-BB” (the “Series CIPS-BB Mortgage Bonds”). The Series CIPS-BB 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 CIPS-BB 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 Series CIPS-BB Notes and any other series of senior notes from time to time outstanding under the Senior Note Indenture. 

The Series CIPS-BB Mortgage Bonds shall be dated as provided in Section 3.03 of Article Three of the Indenture. The
Series CIPS-BB Mortgage Bonds shall mature on June 15, 2011, shall accrue interest from the dates set forth in the Series CIPS-BB Notes and shall bear interest at the same rate of interest as the Series CIPS-BB Notes. Interest on the
Series CIPS-BB Mortgage Bonds is payable on the same dates as interest on the Series CIPS-BB Notes is paid, until the principal sum is paid in full. 
  

 9 

 Upon any payment of the principal of, premium, if any, and interest on, all or any portion
of the Series CIPS-BB 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 CIPS-BB Mortgage Bonds in a principal amount equal to the principal amount of such Series CIPS-BB 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 CIPS-BB 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 Series
CIPS-BB 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 Series CIPS-BB 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. 
 Section 2. The
Series CIPS-BB 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, 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.          

MORTGAGE BOND, SENIOR NOTES SERIES CIPS-BB 
  

			
	No.	 	$150,000,000

 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 (the “Senior Note Indenture”), relating to the Company’s
Senior Notes Series CIPS-BB (the “Senior Notes”) in the aggregate principal amount of $150,000,000, between the Company and the Senior Note Trustee, or registered assigns, the principal sum of $150,000,000 on June 15, 2011, 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 October 1, 2010 (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. 
  

 10 

 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. 
 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	 		 		 	

  

 11 

 [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 October 1, 2010. 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 

as successor trustee to 

Harris Trust and Savings Bank, 

TRUSTEE, 
  

			
	By:	 	 
		 	AUTHORIZED SIGNATORY

[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 (the “Indenture”), dated as of November 1, 1992, executed by
the Illinois Power Company (now the 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 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 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 CIPS-BB 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 October 1, 2010 (the “Supplemental Indenture of October 1, 2010” ), between the Company and the Trustee, supplemental to the Indenture. 

This Series CIPS-BB Mortgage Bond is subject to redemption in accordance with the terms of the Supplemental Indenture of
October 1, 2010. 
 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
VI 
 REDEMPTION 

Section 1. The Series CIPS-BB 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 Series CIPS-BB Notes, and except as set forth in Section 2 of this Article. 

In the event that the Company redeems any Series CIPS-BB 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 CIPS-BB Mortgage Bonds in principal amount corresponding to the Series CIPS-BB 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 Series CIPS-BB Notes on or before the date fixed for any such redemption. 

 

 12 

 Section 2. Upon the occurrence of an Event of Default under the Senior Note
Indenture (as defined therein) and the acceleration of the Series CIPS-BB Notes, the Series CIPS-BB 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
“CIPS-BB 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 Series CIPS-BB Notes specifying the last date to which interest on such Series CIPS-BB Notes has been paid (such date being hereinafter referred to as the “CIPS-BB Initial Interest Accrual Date”) and demanding redemption of the
Series CIPS-BB Mortgage Bonds. The Company waives any right it may have to prior notice of such redemption under the Indenture. Upon surrender of the Series CIPS-BB Mortgage Bonds by the Senior Note Trustee to the Trustee, the
Series CIPS-BB Mortgage Bonds shall be redeemed at a redemption price equal to the principal amount thereof plus accrued interest thereon from the CIPS-BB Initial Interest Accrual Date to the redemption date; provided, however, that in the
event of a rescission or annulment of acceleration of the Series CIPS-BB Notes pursuant to the last paragraph of Section 8.01(a) of the Senior Note Indenture, then any CIPS-BB 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. 

ARTICLE VII 

ISSUE OF THE SERIES CIPS-BB MORTGAGE BONDS. 

Section 1. The Company hereby exercises the right to obtain the authentication of $150,000,000 principal amount of additional
Bonds pursuant to the terms of Section 4.04 of the Indenture, all of which shall be Series CIPS-BB Mortgage Bonds. The principal amount of the Series CIPS-BB Mortgage Bonds outstanding from time to time shall always be equal to
the principal amount of the Series CIPS-BB Notes which are outstanding from time to time under the Senior Note Indenture and to the extent the Senior Note Trustee holds Series CIPS-BB Mortgage Bonds in excess of such principal amount, such
Series CIPS-BB Mortgage Bonds shall be deemed cancelled and retired and no longer outstanding under the Indenture. 

Section 2. Such Series CIPS-BB 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 CIPS-BB Mortgage Bonds shall be deemed to be the “Related Series of Senior Notes Mortgage Bonds” in respect of the Series CIPS-BB Notes. 

ARTICLE VIII 

DESCRIPTION OF THE SERIES CIPS-CC MORTGAGE BONDS 

Section 1. The Company hereby creates a new series of Bonds to be known as “Mortgage Bonds, Senior Notes
Series CIPS-CC” (the “Series CIPS-CC Mortgage Bonds”). The Series CIPS-CC 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 CIPS-CC 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 Series CIPS-CC Notes and any other series of senior notes from time to time outstanding under the Senior Note Indenture. 

The Series CIPS-CC Mortgage Bonds shall be dated as provided in Section 3.03 of Article Three of the Indenture. The
Series CIPS-CC Mortgage Bonds shall mature on June 15, 2036, shall accrue interest from the dates set forth in the Series CIPS-CC Notes and shall bear interest at the same rate of interest as the Series CIPS-CC Notes. Interest on the
Series CIPS-CC Mortgage Bonds is payable on the same dates as interest on the Series CIPS-CC Notes is paid, until the principal sum is paid in full. 
  

 13 

 Upon any payment of the principal of, premium, if any, and interest on, all or any portion
of the Series CIPS-CC 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 CIPS-CC Mortgage Bonds in a principal amount equal to the principal amount of such Series CIPS-CC 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 CIPS-CC 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 Series
CIPS-CC 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 Series CIPS-CC 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. 
 Section 2. The
Series CIPS-CC 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, 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.          

MORTGAGE BOND, SENIOR NOTES SERIES CIPS-CC 
  

			
	No.	 	$61,500,000

 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 (the “Senior Note Indenture”), relating to the Company’s Senior
Notes Series CIPS-CC (the “Senior Notes”) in the aggregate principal amount of $61,500,000, between the Company and the Senior Note Trustee, or registered assigns, the principal sum of $61,500,000 on June 15, 2036, 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 October 1, 2010 (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. 
  

 14 

 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. 
 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	 		 		 	

  

 15 

 [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 October 1, 2010. 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 

as successor trustee to 

Harris Trust and Savings Bank, 

TRUSTEE, 
  

			
	 By:
	 	  

		 	AUTHORIZED SIGNATORY

[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 (the “Indenture”), dated as of November 1, 1992, executed by
the Illinois Power Company (now the 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 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 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 CIPS-CC 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 October 1, 2010 (the “Supplemental Indenture of October 1, 2010” ), between the Company and the Trustee, supplemental to the Indenture. 

This Series CIPS-CC Mortgage Bond is subject to redemption in accordance with the terms of the Supplemental Indenture of
October 1, 2010. 
 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
IX 
 REDEMPTION 

Section 1. The Series CIPS-CC 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 Series CIPS-CC Notes, and except as set forth in Section 2 of this Article. 

In the event that the Company redeems any Series CIPS-CC 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 CIPS-CC Mortgage Bonds in principal amount corresponding to the Series CIPS-CC 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 Series CIPS-CC Notes on or before the date fixed for any such redemption. 

 

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 Section 2. Upon the occurrence of an Event of Default under the Senior Note
Indenture (as defined therein) and the acceleration of the Series CIPS-CC Notes, the Series CIPS-CC 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
“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 Series CIPS-CC Notes specifying the last date to which interest on such Series CIPS-CC Notes has been paid (such date being hereinafter referred to as the “Initial Interest Accrual Date”) and demanding redemption of the
Series CIPS-CC Mortgage Bonds. The Company waives any right it may have to prior notice of such redemption under the Indenture. Upon surrender of the Series CIPS-CC Mortgage Bonds by the Senior Note Trustee to the Trustee, the
Series CIPS-CC Mortgage Bonds shall be redeemed at a redemption price equal to the principal amount thereof plus accrued interest thereon from the Initial Interest Accrual Date to the redemption date; provided, however, that in the event of a
rescission or annulment of acceleration of the Series CIPS-CC Notes pursuant to the last paragraph of Section 8.01(a) of the Senior Note Indenture, then any 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. 

ARTICLE X 

ISSUE OF THE SERIES CIPS-CC MORTGAGE BONDS 

Section 1. The Company hereby exercises the right to obtain the authentication of $61,500,000 principal amount of additional
Bonds pursuant to the terms of Section 4.04 of the Indenture, all of which shall be Series CIPS-CC Mortgage Bonds. The principal amount of the Series CIPS-CC Mortgage Bonds outstanding from time to time shall always be equal to
the principal amount of the Series CIPS-CC Notes which are outstanding from time to time under the Senior Note Indenture and to the extent the Senior Note Trustee holds Series CIPS-CC Mortgage Bonds in excess of such principal amount, such
Series CIPS-CC Mortgage Bonds shall be deemed cancelled and retired and no longer outstanding under the Indenture. 

Section 2. Such Series CIPS-CC 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 CIPS-CC Mortgage Bonds shall be deemed to be the “Related Series of Senior Notes Mortgage Bonds” in respect of the Series CIPS-CC Notes. 

ARTICLE XI 

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
XII 
 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. 

 

 17 

 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 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 October 1, 2010. 

AMEREN ILLINOIS COMPANY 
  

									
	(CORPORATE SEAL)	 		 	
		 		 	By:	 	     /s/ Martin J. Lyons, Jr.

		 		 		 	Name:	 	Martin J. Lyons, Jr.
		 		 		 	Title:	 	Senior Vice President and Chief Financial Officer

 ATTEST:

  

					
	By:	 	     /s/ Craig W. Stensland

		 	Name:	 	Craig W. Stensland
		 	Title:	 	Assistant Secretary

  

 18 

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

successor trustee to 

Harris Trust and Savings Bank, 

TRUSTEE, 
  

					
		 	
	By:	 	         /s/ Judy Bartolini

		 	Name:	 	Judy Bartolini
		 	Title:	 	Vice President

 ATTEST: 

 

					
	By:	 	     /s/ M. Callahan

		 	Name:	 	M. Callahan
		 	Title:	 	Vice President

  

 19 

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

 BE IT REMEMBERED, that on this 1st day of October, 2010, before me, the undersigned, a Notary
Public within and for the City and State aforesaid, personally came Martin J. Lyons, Jr., Senior Vice President and Chief Financial Officer 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/ Carla J. Flinn

	NOTARY PUBLIC

 My Commission Expires on
                     
 (NOTARIAL
SEAL) 
  

	
	 Carla J. Flinn

Notary Seal, State of

Missouri – St. Louis City

Commission #10399906

My Commission Expires 4/20/2014

  

 20 

					
	STATE OF ILLINOIS	  	)	  	
		  		  	ss.
	CITY OF COOK	  	)	  	

 BE IT REMEMBERED, that on this 1st day of October, 2010, before me, the undersigned, a Notary
Public within and for the County and State aforesaid, personally came J. Bartolini, Vice President and M. Callahan, 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/ Julie Meadors

	NOTARY PUBLIC, COOK COUNTY, ILLINOIS

 My
Commission Expires on                      

(NOTARIAL SEAL) 
  

	
	 “Official Seal”

Julie Meadors

Notary Public, State of Illinois

My Commission Expires 1/7/12

 

 21

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