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Exhibit 4.1    
  

	COMMON STOCK	 	 	 	 	 	COMMON STOCK
	NUMBER	 	 	 	 	 	SHARES
	

THIS CERTIFICATE IS TRANSFERABLE IN NEW YORK, NY AND RIDGEFIELD PARK, NJ	
 	

 	
 	

 	
 	

SEE REVERSE FOR CERTAIN DEFINITIONS
	

 

 QRS CORPORATION
	INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE
	 	 	 	 	 	 	CUSIP 74726X 10 5
	

 	
 	

 	
 	

 	
 	

 
	
THIS CERTIFIES THAT	
 	

 	
 	

 	
 	

 
	

    	
 	

 	
 	

 	
 	

 
	

IS THE OWNER OF	
 	

 	
 	

 	
 	

 
	
FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, WITHOUT PAR VALUE, OF
	QRS CORPORATION
	transferable on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this Certificate properly endorsed. This Certificate is not valid until countersigned and
registered by the Transfer Agent and Registrar.
	WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

	
Dated:	
 	

 	
 	

 
	

    
	
 	

 	
 	

    

	

SECRETARY	
 	

[SEAL]	
 	

CHIEF EXECUTIVE OFFICER

	

 	
 	

 	
 	

COUNTERSIGNED AND REGISTERED:
	 	 	 	 	CHASEMELLON SHAREHOLDER SERVICES, L.L.C.
	 	 	 	 	TRANSFER AGENT AND REGISTRAR
	 	 	 	 	By
	

 	
 	

 	
 	

AUTHORIZED SIGNATURE

        A statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock or series thereof and the
qualifications, limitations or restrictions of such preferences and/or rights as established, from time to time, by the Certificate of Incorporation of the Corporation and by any certificate of
designation, and the number of shares constituting each class and series and the designations thereof, may be obtained by the holder hereof upon request and without charge from the Corporation at its
principal office. 

        The following abbreviations when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to
applicable laws or regulations:  

	TEN COM	—	 	as tenants in common	 	 	 	UNIF GIFT MIN ACT	—	 	
	 	Custodian	 	

	TEN ENT	—	 	as tenants by the entireties	 	 	 	 	 	 	(Cust)	 	 	 	(Minor)
	JT TEN	—	 	as joint tenants with right of survivorship and not as tenants in common	 	 	 	 	 	 	under Uniform Gifts to Minors Act

    
 (State)
	

 	

 	
 	

 	
 	

 	
 	

UNIF TRF MIN ACT	

—	
 	

	
 	

Custodian (until age       )	
 	

	 	 	 	 	 	 	 	 	 	 	(Cust)	 	 	 	(Minor)
	 	 	 	 	 	 	 	 	 	 	under Uniform Transfers to Minors Act

    
 (State)

Additional abbreviations may also be used though not in the above list 

        FOR VALUE RECEIVED,
                                         
                                          
                                          
                    hereby sell, assign and transfer unto
 

	PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

    
	 	 	 	 
	

    
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	    

	

    

	

    
	
 	

Shares
	of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint
	    
	 	Attorney
	to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.

	

Dated	
 	

    
	
 	

 
	

 	
 	
X	
 	

    

	 	 	X	 	    

	 	 	NOTICE  	 	THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER.
	
Signature(s) Guaranteed	
 	

 

	

By:
 THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO S.E.C. RULE 174d-15.	
 	

 
	    	 	 

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EXHIBIT 4.5    
  

FOURTH
SUPPLEMENTAL INDENTURE 

dated
as of                    , 200  

to

INDENTURE

dated
as of November 1, 2000 

AMEREN
ENERGY GENERATING COMPANY 

to 

THE
BANK OF NEW YORK, as Trustee 

$225,000,000
7.95% Senior Notes, Series F Due 2032 

        FOURTH SUPPLEMENTAL INDENTURE (the "Fourth Supplemental Indenture"), dated as
of                       , 200  , to the Indenture, dated as of
November 1, 2000 (the "Original Indenture"), from AMEREN ENERGY GENERATING COMPANY, an Illinois corporation (together with its successors and assigns, the "Issuer"), its principal office and
mailing address being at One Ameren Plaza, 1901 Chouteau Avenue, P.O. Box 66149, St. Louis, Missouri 63166-6149, to THE BANK OF NEW YORK, as trustee (the "Trustee"), its office and
mailing address being at 101 Barclay Street, New York, New York 10286. 

W I T N E S S E T H: 

        WHEREAS,
the Issuer and the Trustee have heretofore executed and delivered the Original Indenture to provide for the issuance from time to time of the Issuer's Securities (as defined in
the Original Indenture) to be issued in one or more series; 

        WHEREAS,
Sections 2.1 and 7.1 of the Original Indenture provide, among other things, that the Issuer and the Trustee may enter into indentures supplemental to the Original Indenture for,
among other things, the purpose of establishing the designation, form, terms and provisions of Securities of any series as permitted by Sections 2.1 and 7.1 of the Original Indenture; 

        WHEREAS,
the Issuer has heretofore issued a series of Securities designated 7.95% Senior Notes, Series E due 2032 (the "Old Notes"); 

        WHEREAS,
the Old Notes were sold to a group consisting of Lehman Brothers Inc., Banc One Capital Markets, Inc., BNY Capital Markets, Inc., Credit Suisse First Boston
Corporation and Westdeutsche Landesbank Girozentrale, London Branch (collectively, the "Initial Purchasers"); 

        WHEREAS,
sales and transfers of the Old Notes are restricted to qualified institutional investors pursuant to Rule 144A under the Securities Act of 1933, as amended (the
"Securities Act") and qualified buyers outside the United States pursuant to Regulation S under the Securities Act; 

        WHEREAS,
the Issuer and the Initial Purchasers entered into a Registration Rights Agreement, dated as of June 6, 2002 (the "Registration Rights Agreement"), pursuant to which the
Issuer agreed, for the benefit of the Holders of the Old Notes, to file a registration statement relating to an exchange offer allowing the Holders of the Old Notes to exchange their transfer
restricted Old Notes for a new series of notes that are identical in all material respects to the Old Notes except that the new series of notes
will not contain the transfer restrictions or registration rights (and certain related liquidated damages provisions) applicable to the Old Notes and the new series of notes would be registered under
the Securities Act; 

        WHEREAS,
the Issuer (i) desires the issuance of a series of Securities to be designated as hereinafter provided and (ii) has requested the Trustee to enter into this Fourth
Supplemental Indenture for the purpose of establishing the designation, form, terms and provisions of the Securities of such series; 

        WHEREAS,
all action on the part of the Issuer necessary to authorize the issuance of said Securities under the Original Indenture and this Fourth Supplemental Indenture (the Original
Indenture, as supplemented by this Fourth Supplemental Indenture, being hereinafter called the "Indenture") has been duly taken; and 

        WHEREAS,
all acts and things necessary to make said Securities, when executed by the Issuer and authenticated and delivered by the Trustee as provided in the Original Indenture, the
legal, valid and binding obligations of the Issuer, and to constitute these presents a valid and binding supplemental indenture according to its terms, have been done and performed, and the execution
of this Fourth Supplemental Indenture and the creation and issuance under the Indenture of said Securities have in all respects been duly authorized, and the Issuer, in the exercise of the legal right
and power vested in it, executes this Fourth Supplemental Indenture and proposes to create, execute, issue and deliver said Securities; 

 

        NOW,
THEREFORE, in order to establish the designation, form, terms and provisions of, and to authorize the authentication and delivery of, said Securities, and in consideration of the
acceptance of said Securities by the Holders thereof and of other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

 
 

ARTICLE I    
    
    DEFINITIONS    

        Capitalized
terms not otherwise defined herein shall have the meanings set forth in the Original Indenture. 

 
 

ARTICLE II    
    
    THE TERMS OF THE NOTES    

        Section 2.1    Terms
of 7.95% Senior Notes, Series F due 2032. There is hereby created a series of Securities designated: 7.95%
Senior Notes, Series F due 2032 (the "Exchange Notes"). The Exchange Notes shall be limited to $275,000,000 aggregate principal amount outstanding less the amount of any Old Notes which remain
outstanding and un-exchanged following completion of the Issuer's exchange offer for the Old Notes as contemplated by its prospectus
dated                       ,
200    (the "Prospectus"). Upon delivery of a written order to the Trustee in accordance with the provisions of Section 2.1 of the Original Indenture, the Trustee shall authenticate
and deliver the Exchange Notes. Such written order shall specify the amount of the Exchange Notes to be authenticated and the date on which such Exchange Notes are to be authenticated, which will be
the date the Exchange Notes are issued in exchange for the Old Notes. The Exchange Notes shall be substantially in the form of Exhibit A hereto. 

        Section 2.2    Terms
of Exchange Notes Issued Hereunder in Global Form. 

        (a)
So long as The Depository Trust Company ("DTC") or its nominee is the registered owner or Holder of a Global Security, DTC or its nominee, as the case may be, will be considered the
sole owner or Holder of the Exchange Notes represented by such Global Security for all purposes under the Original Indenture and under the Exchange Notes. No beneficial owner of an interest in a
Global Security will be able to transfer that interest except in accordance with DTC's applicable procedures unless the Issuer shall issue certificates for the Exchange Notes in definitive registered
form. 

        (b)
All payments of the principal of, and interest and additional amounts and premium, if any, on, a Global Security will be made to DTC or its nominees, as the registered owners
thereof. 

        (c)
Transfers between participants in DTC will be effected in the ordinary way in accordance with DTC rules and will be settled in same-day funds. 

        (d)
Certificated definitive Exchange Notes may be in denominations of less than $100,000 to the extent any redemption has reduced such Holder's aggregate holding of such Exchange Notes
to less than $100,000. 

        (e)
If any redemption affecting the Exchange Notes would result in the amount to be paid to a Holder of such affected Exchange Note in respect of such redemption not to equal $1,000 or
an integral multiple thereof, the Issuer shall instruct the Trustee to round the amount to be paid to such Holder to the nearest $1,000 so that the amount to be paid to such Holder equals $1,000 or an
integral multiple thereof. 

        (f)
Except in the limited circumstances described under Section 2.2(g) below, beneficial interest in a Global Security will only be recorded by book-entry and owners
of beneficial interest 

2

 

in a Global Security will not be entitled to receive physical delivery of certificates representing Securities. 

        (g)
If (i) the Issuer notifies the Trustees in writing that DTC or any successor depository is unwilling or unable to continue as a depository for a Global Security or ceases to
be a "clearing agency" registered under the Exchange Act and a successor depository is not appointed by the Issuer within 90 days of such notice, (ii) the Issuer, at its option, notifies
the Trustee in writing that it elects to cause the issuance of the Securities issued hereunder to be in certificated form or (iii) during an Event of Default, a holder of a beneficial interest
in a Global Security requests the issuance of certificated Securities representing such holder's interest then, the Issuer shall issue certificates for the Securities in definitive registered form
substantially in the form attached hereto in exchange for the Global Security outstanding. 

        (h)
The holder of a certificated definitive registered Security may transfer such Security in whole or in part by surrendering it at the Corporate Trust Office of the Trustee in
accordance with the terms of the Indenture and such Security. 

        Section 2.3    Interest,
Principal, Maturity Date and Regular Record Date. Each Exchange Note shall bear interest on the unpaid principal
amount thereof from time to time outstanding from the last interest payment date through which interest shall have been paid on the Old Note for which it is exchanged, as the case may be, until such
amount is paid in full at the rate of interest set forth in the form of such Exchange Note attached hereto. The principal amount of each Exchange Note shall be due and payable at maturity as set forth
in the form of Exchange Note attached hereto. 

        Payment
of principal of, premium, if any, and interest on the Exchange Notes shall be made, as provided in Sections 2.4, 2.10, 3.2 and 3.4 of the Original Indenture except that the final
payment of principal of the Exchange Notes shall be made on the due date therefor to the account of the Holder as such account shall appear in the Security Register, which amount shall be payable upon
presentation and surrender of such Exchange Note at the office of the Issuer. 

        The
Exchange Notes shall mature on the date and in the amounts set forth thereon. 

        The
record date applicable to the Exchange Notes issued hereunder shall be as set forth in the form of Exchange Note attached hereto. 

        All
payments of principal and interest with respect to certificated Exchange Notes will be made by bank check mailed on the Interest Payment Date to the address of such Holder on the
Security Register or, for Holders of at least U.S. $1,000,000 in aggregate principal amount of Exchange Notes, by wire transfer on the Interest Payment Date to a dollar account maintained by the payee
with a bank in The City of New York; provided, that a written request from such Holder to such effect designating such account is received by the
Trustee and the Issuer or the paying agent no later than the record date immediately preceding such Interest Payment Date. Unless such designation is revoked, any such designation made by such person
with respect to such certificated Exchange Notes will remain in effect with respect to any future payments with respect to such certificated Exchange Note payable to such person. 

        Section 2.4    Redemption.

        (a)
Optional Redemption. The Exchange Notes issued hereunder are subject to optional redemption, in whole or in part, at any time at the option of the Issuer
at a redemption price equal to the outstanding principal amount of the Exchange Notes being so redeemed plus accrued and unpaid interest thereon to the date fixed for redemption together with the
Applicable Premium applicable thereto. 

3

 

        (b)
Applicable Premium. As used herein, "Applicable Premium" means an amount calculated as of the date (the "Determination Date") fixed for the redemption of
the Exchange Notes as follows: 

(i)
the average life of the remaining scheduled payments of principal in respect of Outstanding Exchange Notes (the "Remaining Average Life") shall be calculated as of the Determination Date; 

(ii)
the yield to maturity calculated as of a date not more than five days prior to the Determination Date for the United States Treasury security having an average life equal to the Remaining Average
Life and trading in the secondary market at the price closest to the principal amount thereof (the "Primary Issue"); provided,  however, that if no United
States Treasury security has an average life equal to the Remaining Average Life, the yields (the "Other Yields") for the two
maturities of United States treasury securities having average lives most closely corresponding to such Remaining Average Life and
trading in the secondary market at the price closest to the principal amount thereof shall be calculated, and the yield to maturity for the Primary Issue shall be the yield interpolated or
extrapolated from such Other Yields on a straight line basis, rounding in each of such relevant periods to the nearest month; 

(iii)
the discounted present value of the then remaining scheduled payments of principal and interest (but excluding that portion of any scheduled payment of interest that is actually due and paid on
the Determination Date) in respect of the Outstanding Exchange Notes shall be calculated as of the Determination Date using a discount factor equal to the sum of (x) the yield to maturity for
the Primary Issue, plus (y) 37.5 basis points; and 

(iv)
the amount of Applicable Premium in respect of the Exchange Notes to be redeemed shall be an amount equal to (x) the discounted present value of such Exchange Notes to be redeemed
determined in accordance with clause (iii) above, minus (y) the unpaid principal amount of such Exchange Notes;  provided, however, that
the Applicable Premium shall not be less than zero; and 

(v)
such calculation shall be made by an Investment Banker. 

        Section 2.5    Registered
Notes Issued Upon Exchange. The Exchange Notes shall be registered under the Securities Act and the transfer
restrictions set forth in Section 2.6 of the Original Indenture shall not apply to the transfer of the Exchange Notes and the Legend referred to in Section 2.6 of the Original Indenture
shall not be required to be placed on each certificate representing the Exchange Notes. Pursuant to the Issuer's written order to the Trustee in accordance with the provisions of Section 2.1 of
the Original Indenture, the Issuer shall execute and the Trustee shall authenticate and deliver Exchange Notes in denominations of $100,000 original principal amount in exchange for each $100,000
principal amount of outstanding Old Notes, and in integral multiples of $1,000 original principal amount in exchange for each $1,000 in excess thereof if properly tendered by the Holder thereof
together with a completed letter of transmittal in the form attached hereto as Exhibit B which is incorporated herein by this reference. Upon the surrender of any Old Notes as contemplated
herein, such Old Notes shall be cancelled by the Trustee and no further amounts shall be due and payable on such Old Notes (except that any accrued but unpaid liquidated damages due pursuant to the
Registration Rights Agreement shall remain due and payable) and any interest accrued and unpaid on the Old Notes through the date of such exchange, which shall be the date of authentication of the
Exchange Notes, shall from and after such exchange be represented by the Exchange Notes and shall be payable as provided in the Exchange Notes. Interest shall accrue on the Exchange Notes as described
in Section 2.3 hereof; provided that the amount payable on the Exchange Notes pursuant to Section 2.3 will be offset by the amount of interest accrued on the Old Notes prior to the date
of exchange which is thereafter deemed payable on the Exchange Notes under this Section 2.5. 

4

 

        Section 2.6    Treatment
of Series. For all purposes of the Indenture the Old Notes and the Exchange Notes shall be treated as the same
series and the Holders of the Old Notes and the Exchange Notes
shall vote and consent together on all matters as one class and none of the Holders of the Old Notes or the Exchange Notes shall have the right to vote or consent as a separate class on any matter. 

        Section 2.7    Amendment
for Benefit of Exchange Notes. The Indenture is hereby amended, pursuant to Section 7.1(d) of the Indenture
for the benefit of the holders of the Exchange Notes and for so long as the Exchange Notes are outstanding, as follows: 

        (a)
Section 1.1 of the Indenture is amended by adding to the definitions the following: "Existing Generating Assets" means the coal plants and
gas-fired units owned by the Issuer as of the date of issuance of the $275,000,000 7.95% Senior Notes, Series E due 2032." 

        (b)
Section 3.9 of the Indenture is amended to delete the words "Initial Generation Assets" and insert in lieu thereof the words "Initial Generating Assets or Existing Generating
Assets." 

 
 

ARTICLE III    
    
    MISCELLANEOUS    

        Section 3.1    Execution
of Supplemental Indenture. This Fourth Supplemental Indenture is executed and shall be construed as an indenture
supplemental to the Original Indenture and, as provided in the Original Indenture, this Fourth Supplemental Indenture forms a part thereof. 

        Section 3.2    Concerning
the Trustee. The Trustee shall not be responsible in any manner for or with respect to the validity or sufficiency
of this Fourth Supplemental Indenture, or the due execution hereof by the Issuer, or for or with respect to the recitals and statements contained herein, all of which recitals and statements are made
solely by the Issuer. 

        Section 3.3    Counterparts.
This Fourth Supplemental Indenture may be executed in any number of counterparts, each of which when so
executed shall be deemed to be an original; but all such counterparts shall together constitute but one and the same instrument. 

        Section 3.4    GOVERNING
LAW. THIS FOURTH SUPPLEMENTAL INDENTURE AND EACH EXCHANGE NOTE ISSUED HEREUNDER SHALL, PURSUANT TO SECTION
5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW, BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO THE CHOICE OF LAW PROVISIONS THEREOF (OTHER THAN SUCH SECTION
5-1401). 

5

        IN WITNESS WHEREOF, the parties hereto have caused this Fourth Supplemental Indenture to be duly executed as
of                    , 200  . 

	

 	
 	

AMEREN ENERGY GENERATING COMPANY, as Issuer
	

 	
 	

By:	

 
	 	 	 	
 Name:

Title:
	

 	
 	

THE BANK OF NEW YORK, as Trustee
	

 	
 	

By:	

 
	 	 	 	
 Name:

Title:

EXHIBIT A  

FORM OF SECURITY 

        UNLESS
THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
CERTIFICATE ISSUED IN EXCHANGE FOR THIS CERTIFICATE OR ANY PORTION HEREOF IS REGISTERED IN THE NAME OF CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO.), ANY TRANSFER, PLEDGE
OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON OTHER THAN THE DEPOSITORY TRUST COMPANY OR A NOMINEE THEREOF IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS
AN INTEREST HEREIN. 

        TRANSFERS
OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF THE DEPOSITORY TRUST COMPANY OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 2.6 OF THE INDENTURE REFERRED TO ON THE REVERSE
HEREOF. 

[FORM
OF FACE OF EXCHANGE NOTE] 

CUSIP
[            ][            ][            ] 

[Common
Code]

[ISIN][            ] 

No.

$

AMEREN ENERGY GENERATING COMPANY 

7.95%
Senior Notes, Series F Due 2032 

        Ameren
Energy Generating Company (the "Issuer"), for value received hereby promises to pay to                        or registered
assigns the principal sum of                        Dollars at the
Issuer's office or agency for said purpose as provided in the Indenture referred to herein, on June 1, 2032 in such coin or currency of the United States of America as at the time of payment
shall be legal tender for the payment of public and private debts, and to pay interest, semi-annually in arrears on June 1 and December 1 of each year, commencing
December 1, 2002, on said principal sum in like coin or currency at the rate per annum set forth above at said offices or agencies from the date of original issuance or the most recent interest
payment date to which interest on the Senior Notes of this series has been paid or duly provided for. Notwithstanding the foregoing, if the date hereof is after May 15 or November 15, as
the case may be, and before the following June 1 or December 1, this Senior Note shall bear interest from such June 1 or December 1; provided, that if the Issuer shall
default in the payment of interest due on such June 1 or December 1, then this Senior Note shall bear interest from the next preceding June 1 or December 1 to which
interest on the Senior Notes of this series has been paid or duly provided for. The interest so payable on any June 1 or December 1 will, except as otherwise provided in the Indenture
referred to on the reverse hereof, be paid to the Person in whose name this Senior Note is registered at the close of business on the 15th day of May or the 15th day of November preceding such
June 1 or December 1, whether or not such day is a Business Day; provided, that principal, premium, if any, and interest shall be paid by mailing on the interest payment date a check for
such to or upon the written order of the registered Holders of Senior Notes of this series entitled thereto at their last address as it appears on the Senior Notes Register or, upon written 

application to the Trustee by a Holder of $1,000,000 or more in aggregate principal amount of Senior Notes of this series, by wire transfer on the interest payment date of immediately available funds
to an account maintained by such Holder with a bank or other financial institution. Interest on this Senior Note shall be computed and accrue on the basis of a 360-day year comprised of
twelve 30-day months and otherwise as provided in the Indenture. Additional Interest shall accrue on this Senior Note, as provided for in the Registration Rights Agreement, if the Issuer
ceases to maintain its status as a reporting company under the Exchange Act whether or not the Securities and Exchange Commission (the "SEC") rules and regulations require the Issuer to maintain that
status (unless the SEC will not accept the filing of the applicable reports). 

        Interest
on overdue principal and (to the extent permitted by applicable law) on overdue installments of interest (including without limitation during the 5-day period
referred to in Section 4.1(b) of the Indenture) shall accrue at the rate per annum set forth above. 

        The
Senior Notes of this series are payable on a parity basis with the Issuer's 7.95% Senior Notes, Series E Due 2032 (the "Old Notes") issued under the Indenture and the Third
Supplemental Indenture, dated as of June 6, 2002 in the aggregate principal amount of $275,000,000. The Senior Notes of this series are being issued in exchange for a like principal amount of
Old Notes and the combined aggregate principal amount of the Senior Notes of this series and the Old Notes outstanding at any one time is limited to $275,000,000. Pursuant to the Indenture, the Old
Notes and the Senior Notes of this series shall be treated as the same series and the holders of the Old Notes and the Senior Notes of this series shall vote and consent together on all matters as one
class and none of the holders of the Old Notes or the Senior Notes of this series shall have the right to vote or consent as a separate class on any matter. 

        Reference
is made to the further provisions set forth on the reverse hereof. Such further provisions shall for all purposes have the same effect as though fully set forth at this place. 

        This
Senior Note shall not be entitled to any benefit under the Indenture, or be valid or obligatory, until the certificate of authentication hereon shall have been duly signed by the
Trustee acting under the Indenture. 

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

	

 	

 	
 	

THE BANK OF NEW YORK, as Trustee
	

 	

 	
 	

By:	

 
	 	 	 	 	
 Name:

Title:
	

(SEAL)

Attested:	
 	

 	

 
	

By:	

	
 	

 	

 
	Name:

Title:	 	 	 	 

[FORM OF REVERSE OF EXCHANGE NOTE] 

AMEREN
ENERGY GENERATING COMPANY 

7.95
Senior Notes, Series F Due 2032 

        This
Senior Note is one of a duly authorized issue of debt securities of the Issuer, limited to the aggregate principal amount of $275,000,000 (except as otherwise provided in the
Indenture mentioned below), issued or to be issued pursuant to an Indenture dated as of November 1, 2000 as supplemented by the Fourth Supplemental Indenture dated as of            ,
200
(as so supplemented, the "Indenture"), duly executed and delivered by the Issuer to the Trustee. Reference is hereby made to the Indenture and all indentures supplemental thereto for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer and the Holders (the words "Holders" or "Holder" meaning the registered holders or
registered holder) of the Senior Notes. Capitalized terms used herein, but not otherwise defined herein, shall have the meanings assigned to them in the Indenture. 

        In
case an Event of Default shall have occurred and be continuing, the principal of all the Securities may be declared due and payable, in the manner and with the effect, and subject to
the conditions, provided in the Indenture. The Indenture provides that in certain events such declaration and its consequences may be waived by the Holders of a majority in aggregate principal amount
of the Securities then Outstanding and that, prior to any such declaration, such Holders may waive any past default under the Indenture and its consequences except a default in the payment of
principal of or premium, if any, or interest on any of the Securities and as otherwise provided in the Indenture. Any such consent or waiver by the Holder of this Senior Note (unless revoked as
provided in the Indenture) shall be conclusive and binding upon such Holder and upon all future Holders and owners of this Senior Note and any Security which may be issued in exchange or substitution
hereof, whether or not any notation thereof is made upon this Senior Note or such other Security. 

        The
Indenture permits the Issuer and the Trustee, with the consent of the Holders of not less than a majority in aggregate principal amount of the Securities of all series at the time
Outstanding considered as one class, evidenced as in the Indenture provided, to modify the Indenture or any supplemental indentures or the rights of the Holders of the Senior Notes; provided that no
such modification shall (a) change the Stated Maturity of the principal of, or any installment of principal of or interest on, any Security, or reduce the principal amount thereof, or reduce
the rate or extend the time of payment of interest thereon, or reduce any amount payable on redemption thereof or impair or affect the right of any Holder of the Security to institute suit for the
payment thereof without the consent of the Holder of each Security so affected; or (b)(i) reduce the aforesaid percentage of Securities, the consent of the Holders of which is required for any
such modification or the percentage of Securities, the consent of Holders of which is required for any waiver provided for in the Indenture; (ii) change any obligation of the Issuer to maintain
an office or agency for payment of and transfer and exchange of the Securities;
or (iii) make certain changes to provisions relating to waiver or to the provision for supplementing the Indenture; in each case without the consent of the Holders of all Securities then
Outstanding. 

        No
reference herein to the Indenture and no provision of this Senior Note or of the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to
pay the principal of and premium, if any, and interest on this Senior Note at the place, times, and rate, and in the currency, herein prescribed. 

        The
Senior Notes are issuable only as registered Senior Notes without coupons in denominations of $100,000 and any integral multiple of $1,000 in excess thereof. 

        At
the office or agency of the Issuer referred to on the face hereof and in the manner and subject to the limitations provided in the Indenture, Senior Notes may be presented for
exchange for a like aggregate principal amount of Senior Notes of other authorized denominations. 

        Upon
due presentment for registration of transfer of this Senior Note at the above-mentioned office or agency of the Issuer, a new Senior Note or Senior Notes of authorized
denominations, for a like aggregate principal amount, will be issued to the transferee as provided in the Indenture. No service charge shall be made for any such transfer, but the Issuer may require
payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto. 

        The
Senior Notes may be redeemed in whole or in part (if in part, by lot or by such other method as the Trustee shall deem fair or appropriate) prior to Stated Maturity at the option of
the Issuer, upon mailing a notice of such redemption not less than 30 nor more than 60 days prior to the date fixed for redemption to the Holders of Senior Notes, all as provided in the
Indenture, at a redemption price equal to the principal amount thereof plus accrued and unpaid interest thereon, if any, to the date of redemption, plus the Applicable Premium. 

        Subject
to payment by the Issuer of a sum sufficient to pay the amount due on redemption, interest on this Senior Note shall cease to accrue upon the date duly fixed for redemption of
this Senior Note. 

        The
Issuer, the Trustee, and any authorized agent of the Issuer or the Trustee, may deem and treat the registered Holder hereof as the absolute owner of this Senior Note (whether or not
this Senior Note shall be overdue and notwithstanding any notation of ownership or other writing hereon made by anyone other than the Issuer or the Trustee or any authorized agent of the Issuer or the
Trustee), for the purpose of receiving payment of, or on account of, the principal hereof and premium, if any, and,
subject to the provisions on the face hereof, interest hereon and for all other purposes, and neither the Issuer nor the Trustee nor any authorized agent of the Issuer or the Trustee shall be affected
by any notice to the contrary. 

        No
recourse shall be had for the payment of the principal of, or premium, if any, or the interest on this Senior Note, for any claim based hereon, or otherwise in respect hereof, or
based on or in respect of the Indenture or any indenture supplemental thereto, against any incorporator, shareholder, officer or director, as such, past, present or future, of the Issuer or of any
successor corporation, either directly or through the Issuer or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any assessment or
penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issue hereof, expressly waived and released. 

[FORM
OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION] 

Dated:

        This
is one of the Senior Notes referred to in the within-mentioned Indenture. 

	

 	
 	

THE BANK OF NEW YORK, as Trustee
	

 	
 	

By:	

	 	 	 	Authorized Signatory

[FORM
OF ASSIGNMENT] 

I
or we assign and transfer this Security to: 

(Insert
assignee's social security or tax I.D. number) 

	

	
 	

 
	

	
 	

 
	

	
 	

 
	

 (Print or type name, address and zip code of assignee)

and irrevocably appoint:	
 	

 
	

	
 	

 
	

	
 	

 
	Agent to transfer this Security on the books of the Issuer. The Agent may substitute another to act for him.

	

Date:	

	
 	

Your Signature:	

	

 	

 	
 	

 	

 (Sign exactly as your name appears on the other side of this Security)

*Signature
Guarantee:                                       
            

*Signatures
must be guaranteed by an "eligible guarantor institution" meeting the requirements of the Registrar, which requirements include membership or participation in STAMP or such other
"signature guarantee program" as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934. 

EXHIBIT B  

LETTER OF TRANSMITTAL 

Attached
hereto 

QuickLinks

EXHIBIT 4.5

ARTICLE I DEFINITIONS

ARTICLE II THE TERMS OF THE NOTES

ARTICLE III MISCELLANEOUS

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