Document:

Supplemental Indenture to CIPS Mortgage 10-1-2004

                                                                                Exhibit
4.91

	
      When Recorded
      Mail To:

	 
	
      James A.
      Tisckos

	
      Central
      Illinois Public Service Company

	
      607 East
      Adams Street

	
      Springfield,
      IL 62739

	 
	 

 

Executed in 100
Counterparts, No.  .

 

Supplemental
Indenture

 

dated
October 1, 2004 

 

Central
Illinois Public Service Company

 

to

 

U.S.
Bank National Association

 

and
Patrick J. Crowley,

as
trustees

 

(Supplemental
to the Indenture of Mortgage or Deed of Trust 

dated
October 1, 1941, executed by Central Illinois Public Service Company

to
Continental Illinois National Bank and Trust Company of Chicago

and
Edmond B. Stofft, as trustees)

(Providing
for First Mortgage Bonds, Environmental Improvement Series 2004)

This instrument was
prepared by Steven R. Sullivan, Senior Vice President Governmental/Regulatory
Policy, General Counsel and Secretary of Central Illinois Public Service
Company, One Ameren Plaza, 1901 Chouteau Avenue, St. Louis, Missouri
63103.

This Supplemental
Indenture, dated
October 1, 2004, made and entered into by and between Central Illinois
Public Service Company, a corporation
organized and existing under the laws of the State of Illinois (hereinafter
commonly referred to as the “Company”), and U.S.
Bank
National Association (formerly U.S.
Bank Trust National Association, formerly First Trust National Association,
formerly First Trust of Illinois, National Association, successor trustee to
Bank of America Illinois, formerly Continental Bank, formerly Continental Bank,
National Association and formerly Continental Illinois National Bank and Trust
Company of Chicago), a national banking association having its office or place
of business in the City of Chicago, Cook County, State of Illinois (hereinafter
commonly referred to as the “Trustee”), and Patrick J.
Crowley (successor Co-Trustee), of the City of Montvale, Bergen County, State of
New Jersey, as Trustees under the Indenture of Mortgage or Deed of Trust dated
October 1, 1941, heretofore executed and delivered by the Company to
Continental Illinois National Bank and Trust Company of Chicago and Edmond B.
Stofft, as Trustees, as amended by the Supplemental Indentures dated,
respectively, September 1, 1947, January 1, 1949, February 1,
1952, September 1, 1952, June 1, 1954, February 1, 1958,
January 1, 1959, May 1, 1963, May 1, 1964, June 1, 1965,
May 1, 1967, April 1, 1970, April 1, 1971, September 1,
1971, May 1, 1972, December 1, 1973, March 1, 1974, April 1,
1975, October 1, 1976, November 1, 1976, October 1, 1978,
August 1, 1979, February 1, 1980, February 1, 1986, May 15,
1992, July 1, 1992, September 15, 1992, April 1, 1993, June 1,
1995, March 15, 1997, June 1, 1997, December 1, 1998 and
June 1, 2001, heretofore executed and delivered by the Company to the
Trustees under said Indenture of Mortgage or Deed of Trust dated October 1,
1941; said Indenture of Mortgage or Deed of Trust dated October 1, 1941, as
amended by said Supplemental Indentures, being hereinafter sometimes referred to
as the “Indenture”; and said U.S.
Bank National Association and Patrick J. Crowley, as such Trustees, being
hereinafter sometimes referred to as the “Trustees” or the
“Trustees under
the Indenture”;

 

Witnesseth:

 

Whereas, the Company has
determined, by resolutions duly adopted by its Board of Directors, to issue
bonds of an additional series under and to be secured by the Indenture, as
hereby amended, to be known and designated as First Mortgage Bonds,
Environmental Improvement Series 2004 (hereinafter sometimes referred to as
the “bonds of
Environmental Improvement Series 2004” or the
“bonds of said
Series”), and the bonds of
said Series shall be authorized, authenticated and issued only as registered
bonds without coupons, and to execute and deliver this supplemental indenture,
pursuant to the provisions of Article I, as amended, Section 6 of
Article II and Article XVI of the Indenture, for the purpose of
(1) creating and authorizing not to exceed $35,000,000 aggregate principal
amount of bonds of Environmental Improvement Series 2004 and setting forth
the form, terms, provisions and characteristics thereof, (2) modifying or
amending certain provisions of the Indenture in the particulars and to the
extent hereinafter specifically provided, and (3) specifically describing
and conveying to the Trustees, upon the trusts and for the purposes of the
Indenture, as hereby amended, certain additional properties which the Company
has constructed or otherwise acquired subsequent to March 31, 2001, except
property of the character expressly excepted or excluded from the lien of the
Indenture by the terms thereof, and which are owned by the Company at the date
of the execution hereof and are subject in any event to the lien and effect of
the Indenture; and

 

Whereas, the Illinois
Finance Authority (the “Authority”) has agreed to
issue $35,000,000 in principal amount of its Environmental Improvement Revenue
Refunding Bonds (AmerenCIPS Project) Series 2004 (the “Revenue
Refunding Bond Series 2004”), pursuant to the
provisions of an Indenture of Trust dated as of October 1, 2004 (the
“Series 2004
Trust Indenture”) between the
Authority and UMB Bank, N.A., as Trustee (said Trustee, or any successor trustee
under the Series 2004 Trust Indenture, being hereinafter referred to as the
“Trust
Indenture Trustee”); and

 

Whereas, the proceeds of
the Revenue Refunding Bonds Series 2004 will be loaned by the Authority to
the Company pursuant to a Loan Agreement dated as of October 1, 2004 (the
“Series 2004
Loan Agreement”) between the
Authority and the Company, in order to finance the refunding of outstanding
obligations incurred to finance a portion of the costs of certain pollution
control facilities at the Coffeen and Newton coal fired electric generating
stations located in the Illinois counties of Montgomery and Jasper,
respectively, which stations are now owned by Ameren Energy Generating Company,
an affiliate of the Company, and which facilities are described in Exhibit A to
the Series 2004 Loan Agreement; and

 

Whereas, payments to be
made by the Company pursuant to the Series 2004 Loan Agreement have been
assigned by the Authority to the Trust Indenture Trustee in order to secure the
payment of the Revenue Refunding Bonds Series 2004; and

 

Whereas, in order to
secure the Company’s loan payment obligations under the Series 2004 Loan
Agreement and to provide for the payment of principal, interest and premium, if
any, in respect of the Revenue Refunding Bonds Series 2004, and in order to
comply with the provisions of Section 4.08 of the Series 2004 Loan
Agreement, the Company desires to issue its bonds of Environmental Improvement
Series 2004 to the Trust Indenture Trustee in a principal amount equal to
the principal amount of the Revenue Refunding Bonds Series 2004; and

 

Whereas, the execution and
delivery by the Company of this supplemental indenture have been duly authorized
by the Board of Directors of the Company; and the Company has requested, and
hereby requests, the Trustees to enter into and join with the Company in the
execution and delivery of this supplemental indenture; and

 

Whereas, the bonds of
Environmental Improvement Series 2004 to be authorized, authenticated and
issued only in the form of registered bonds without coupons, and the bonds of
Environmental Improvement Series 2004 and the certificate of the Trustee
thereon shall be substantially in the following form, to wit:

[FORM OF
BOND]

No.
_______$__________

Illinois Commerce
Commission

Identification No.:
Ill. C.C. No. 6337

Notwithstanding
any provisions hereof or in the Indenture

this Bond
is not assignable or transferable except as

permitted
or required by Section 13.15 of the Indenture of
Trust,

dated as of
October 1, 2004, hereinafter referred to.

Central Illinois
Public Service Company

First Mortgage
Bond, Environmental Improvement Series 2004 

	
       

      Original

      Issue
      Date

       
	
       

      Dated

      Date*
	
       

      Maturity

      Date

       
	
       

      CUSIP

       

	 	 	
      July 1,
      2025
	 

 

REGISTERED
OWNER 
____________________________________________________________________________________________________

 

PRINCIPAL
AMOUNT  ___________________________________________________________________________________________DOLLARS

Central Illinois
Public Service Company, an Illinois corporation (hereinafter referred to as the
“Company”), for value
received, hereby promises to pay to the Registered Owner specified above, as
trustee under the Series 2004 Trust Indenture hereinafter referred to, or
registered assigns, the Principal Amount specified above on the Maturity Date
specified above, subject to prior redemption and to pay to the Registered Owner
interest on said sum from the Dated Date hereof, at the same interest rate or
rates and on the same dates as the Revenue Refunding Bonds Series 2004
(hereinafter referred to) (as determined in accordance with the Series 2004
Trust Indenture referred to above), until said principal sum is paid, but in no
event shall the interest rate exceed eighteen percent (18%) per annum. The
interest so payable on any interest payment date will be paid, subject to
certain exceptions provided in the Supplemental Indenture dated October 1,
2004, hereinafter referred to, to the Registered Owner at the close of business
of the Trustee hereinafter referred to on the business day immediately preceding
the interest payment date. Both the principal of and the interest on this bond
shall be payable in immediately available funds at the office or agency of the
Trust Indenture Trustee hereinafter

 

___________________

*    To be completed in
accordance with the terms of Section 1.1 of Article I
hereof.

 

 referred to,
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. 

 

Under an Indenture
of Trust dated as of October 1, 2004 (the “Series 2004
Trust Indenture”) between the
Illinois Finance Authority (the “Authority”) and UMB Bank,
N.A., as trustee (the “Trust
Indenture Trustee”), the Authority
will issue, concurrently with the issuance of this bond, an issue of Bonds under
the Series 2004 Trust Indenture entitled “Environmental Improvement Revenue
Refunding Bonds (AmerenCIPS Project) Series 2004” (the “Revenue
Refunding Bonds Series 2004”). The proceeds of
the Revenue Refunding Bonds Series 2004 will be loaned by the Authority to
the Company pursuant to a Loan Agreement dated as of October 1, 2004 (the
“Series 2004
Loan Agreement”) between the
Authority and the Company. Pursuant to Section 4.08 of the Series 2004
Loan Agreement, this bond is issued to the Trust Indenture Trustee to secure any
and all obligations of the Company under the Series 2004 Loan Agreement
relating to the Revenue Refunding Bonds Series 2004. Payment of principal
of, or premium, if any or interest on, the Revenue Refunding Bonds
Series 2004 shall constitute payments on this bond as further provided
herein and in the Supplemental Indenture dated October 1, 2004 pursuant to
which this bond has been issued (the “Supplemental
Indenture”).

 

Upon any payment of
the principal of, premium, if any, and interest on, all or any portion of the
Revenue Refunding Bonds Series 2004, 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 8.01 of the Series 2004
Trust Indenture, bonds of Environmental Improvement Series 2004 in a
principal amount equal to the principal amount of such Revenue Refunding Bonds
Series 2004 and having both a corresponding maturity date and interest rate
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 bonds shall be surrendered to the
Trustee (as hereinafter defined) for delivery to the Company for cancellation as
provided in Section 8.02 of the Series 2004 Trust Indenture. The
Trustee may at anytime and all times conclusively assume that the obligation of
the Company to make payments with respect to the principal of and premium, if
any, and interest on the Revenue Refunding Bonds Series 2004, 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 Trust Indenture Trustee signed by one of
its officers stating (i) that timely payment of principal, or premium or
interest on, the Revenue Refunding Bonds Series 2004 has not been made,
(ii) that the Company is in arrears as to the payments required to be made
by it to the Trust Indenture Trustee pursuant to the Series 2004 Trust
Indenture, and (iii) the amount of the arrearage.

 

This bond is one of
the bonds issued and to be issued from time to time under and in accordance with
and all secured by the indenture of mortgage or deed of trust dated
October 1, 1941, executed and delivered by the Company to U.S. Bank
National Association (formerly U.S. Bank Trust National Association, formerly
First Trust National Association, formerly First Trust of Illinois, National
Association, successor trustee to Bank of America Illinois, formerly Continental
Bank, formerly Continental Bank, National Association and formerly Continental
Illinois National Bank and Trust Company of Chicago and hereinafter referred to
as the “Trustee”) and Edmond B.
Stofft, as Trustees, and the various indentures supplemental thereto, including
the Supplemental Indenture pursuant to which $35,000,000 in aggregate principal
amount of the First Mortgage Bonds, Environmental Improvement Series 2004
are authorized, each executed and delivered by the Company to the Trustees under
said indenture of mortgage or deed of trust dated October 1, 1941, prior to
the authentication of this bond (said indenture of mortgage or deed of trust and
said supplemental indentures being hereinafter referred to, collectively, as the
“Indenture”); and said U.S.
Bank National Association and Patrick J. Crowley (successor Co-Trustee)
being now the Trustees under the Indenture. Reference to the Indenture and to
all supplemental indentures, if any, hereafter executed pursuant to the
Indenture is hereby made for a description of the property mortgaged and
pledged, the nature and extent of the security and the rights of the holders and
Registered Owners of said bonds and of the Trustees and of the Company in
respect of such security. By the terms of the Indenture the bonds to be secured
thereby are issuable in series, which may vary as to date, amount, date of
maturity, rate of interest, redemption provisions, medium of payment and in
other respects as in the Indenture provided. 

 

This bond is not
redeemable except on the respective dates, in the respective principal amounts
and for the respective redemption prices that correspond to the redemption dates
for, the principal amounts to be redeemed of, and the redemption prices for, the
Revenue Refunding Bonds Series 2004, and except upon written demand of the
Trust Indenture Trustee following the occurrence of an Event of Default under
the Series 2004 Trust Indenture and the acceleration of the Revenue
Refunding Bonds Series 2004, as provided in Section 9.02 of the
Series 2004 Trust Indenture.

 

In case of certain
events of default specified in the Indenture, the principal of this bond may be
declared or may become due and payable in the manner and with the effect
provided in the Indenture. No recourse shall be had for the payment of the
principal of or interest on this bond, or for any claim based hereon, or
otherwise in respect hereof or of the Indenture or any indenture supplemental
thereto, to or against any incorporator, stockholder, officer or director, past,
present or future, of the Company, or of any predecessor or successor
corporation, either directly or through the Company, or such predecessor or
successor corporation, under any constitution or statute or rule of law, or by
the enforcement of any assessment, penalty, or otherwise, all such liability of
incorporators, stockholders, directors and officers being waived and released by
the Registered Owner hereof by the acceptance of this bond and being likewise
waived and released by the terms of the Indenture.

 

This bond shall not
be assignable or transferable except as permitted or required by
Section 13.15 of the Series 2004 Trust Indenture. This bond is
exchangeable by the Registered Owner hereof, in person or by attorney duly
authorized, at the principal office or place of business of the Trustee under
the Indenture, upon the surrender and cancellation of this bond and the payment
of any stamp tax or other governmental charge, and upon any such exchange a new
registered bond or bonds without coupons, of the same series and maturity and
for the same aggregate principal amount, will be issued in exchange heretofore;
provided, that the Company
shall not be required to exchange any bonds of Environmental Improvement
Series 2004 for a period of ten (10) days next preceding an Interest
Payment Date with respect to such bonds.

 

As provided in
Section 8.02 of the Series 2004 Trust Indenture, from and after the
Release Date (as defined in the Series 2004 Trust Indenture), the
obligations of the Company with respect to this bond shall be deemed to be
satisfied and discharged, this bond shall cease to secure in any manner any
Revenue Refunding Bonds Series 2004 outstanding under the Series 2004
Trust Indenture, and, pursuant to Section 8.02 of the Series 2004
Trust Indenture, the Trust Indenture Trustee shall forthwith deliver this bond
to the Company for cancellation.

 

This bond shall not
be valid or become obligatory for any purpose unless and until it shall have
been authenticated by the execution by the Trustee or its successor in trust
under the Indenture of the Trustee’s Certificate endorsed hereon.

 

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

 

Central Illinois
Public Service Company

 

By
______________________________

          President

 

Attest:

 

By_____________________________

        Secretary

 

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

 

U.S. Bank National
Association, as
Trustee

 

By_______________________________

       Authorized
Officer

 

[END OF
FORM OF BOND]

 

Now,
Therefore, in consideration
of the premises and of the sum of One Dollar ($1.00) duly paid by the Trustees
to the Company, and of other good and valuable considerations, the receipt
whereof is hereby acknowledged, and for the purpose of further assuring to the
Trustees under the Indenture their title to, or lien upon, the property
hereinafter described, under and

 

 pursuant to
the terms of the Indenture, as hereby amended, and for the purpose of further
securing the due and punctual payment of the principal of and interest and the
premium, if any, on all bonds which have been heretofore or shall be hereafter
issued under the Indenture and indentures supplemental thereto and which shall
be at any time outstanding thereunder and secured thereby and $35,000,000
aggregate principal amount of the Environmental Improvement Series 2004,
and for the purpose of securing the faithful performance and observance of all
the covenants and conditions set forth in the Indenture and/or in any indenture
supplemental thereto, the Company has given, granted, bargained, sold,
transferred, assigned, pledged, mortgaged, warranted the title to and conveyed,
and by these presents does give, grant, bargain, sell, transfer, assign, pledge,
mortgage, warrant the title to and convey unto U.S. Bank National
Association and Patrick J.
Crowley, as Trustees under
the Indenture as therein provided, and their successors in the trusts thereby
created, and to their assigns, all the right, title and interest of the Company
in and to any and all premises, plants, property, leases and leaseholds,
franchises, permits, rights and powers, of every kind and description, real and
personal, which have been acquired by the Company through construction,
purchase, consolidation or merger, or otherwise, subsequent to March 31,
2001, and which are owned by the Company at the date of the execution hereof,
together with the rents, issues, products and profits therefrom, excepting,
however, and there is hereby expressly reserved and excluded from the lien and
effect of the Indenture and of this supplemental indenture, all right, title and
interest of the Company, now owned, in and to (a) all cash, bonds, shares
of stock, obligations and other securities not deposited with the Trustee or
Trustees under the Indenture, and (b) all accounts and bills receivable,
judgments (other than for the recovery of real property or establishing a lien
or charge thereon or right therein) and chooses in action not specifically
assigned to and pledged with the Trustee or Trustees under the Indenture, and
(c) all personal property acquired or manufactured by the Company for sale,
lease, rental or consumption in the ordinary course of business, and
(d) the last day of each of the demised terms created by any lease of
property leased to the Company and under each and every renewal of any such
lease, the last day of each and every such demised term being hereby expressly
reserved to and by the Company, and (e) all gas, oil and other minerals now
or hereafter existing upon, within or under any real estate of the Company
subject to, or hereby subjected to, the lien of the Indenture.

 

Without in any way
limiting or restricting the generality of the foregoing description or the
foregoing exceptions and reservations, the Company hereby expressly gives,
grants, bargains, sells, transfers, assigns, pledges, mortgages, warrants the
title to and conveys unto said U.S. Bank National
Association and Patrick J.
Crowley, as Trustees under
the Indenture, and unto their successor or successors in trust, and their
assigns, under the trusts and for the purposes of the Indenture, as hereby
amended, the properties described in Schedule A to this supplemental indenture,
which is incorporated herein by reference with the same force and effect as if
set forth at length herein, and which properties have been acquired by the
Company, through construction, purchase, consolidation or merger, or otherwise,
subsequent to March 31, 2001 (except as otherwise indicated in said
Schedule A), and which are owned by the Company at the date of the execution
hereof together with the tenements, hereditaments and appurtenances thereunto
belonging or appertaining, to have and to hold
all
said property, rights and interests forever, but in trust,
nevertheless, upon the trusts,
for the purposes and subject to all the terms, conditions, provisions and
restrictions of the Indenture, as hereby amended.

 

And upon the
considerations and for the purposes aforesaid, and in order to provide, pursuant
to the terms of the Indenture, for the issuance under the Indenture, as hereby
amended, of bonds of Environmental Improvement Series 2004 and to fix the
terms, provisions and characteristics of the bonds of Environmental Improvement
Series 2004, and to modify or amend the Indenture in the particulars and to
the extent hereinafter in this supplemental indenture specifically provided, the
Company hereby covenants and agrees with the Trustees as follows:

 

Article
I

 

Section 1.1. 
A
series of bonds issuable under the Indenture, as hereby amended, to be known and
designated as “First Mortgage Bonds, Environmental Improvement Series 2004”
and which shall be executed, authenticated and issued only in the form of
registered bonds without coupons, is hereby created and authorized. The bonds of
Environmental Improvement Series 2004 and the Trustee’s Certificate to be
endorsed thereon shall be substantially in the form thereof hereinbefore
recited. Each bond of Environmental Improvement Series 2004 is to be issued
and registered in the name of UMB Bank, N.A., as trustee, or a successor trustee
(said trustee or any successor trustee being hereinafter referred to as the
“Trust
Indenture Trustee”), under the
Indenture of Trust dated as of October 1, 2004 between the Illinois Finance
Authority (the “Authority”) and the Trust
Indenture Trustee (the “Series 2004
Trust Indenture”), to secure any
and all obligations of the Company under the Series 2004 Loan Agreement
relating to the Revenue Refunding Bond Series 2004. Each bond of Environmental
Improvement Series 2004 shall be dated as of the Interest Payment Date thereof
to which interest was paid next preceding the date of issue, unless
(a) issued on an Interest Payment Date thereof to which interest was paid,
in which event it shall be dated as of such issue date, or (b) issued prior
to the occurrence of the first Interest Payment Date thereof to which interest
was paid, in which event it shall be dated the Original Issue Date specified in
the form of bond. The bonds of Environmental Improvement Series 2004 shall be
due and payable in the principal amount and on the Maturity Date specified
below, subject to prior redemption, shall bear interest from the date thereof at
the interest rate or rates (as determined in accordance with the Series 2004
Trust Indenture referred to above), but in no event shall the interest rate
exceed eighteen percent (18%) per annum payable, on the Interest Payment Dates
as determined in accordance with the Series 2004 Trust Indenture referred to in
the form of bond to the Registered Owner as specified on the registry books of
the Trustee at the close of business of the Trustee on the applicable Record
Date as provided in Section 3 of this Article I.

	
       

      Series
	
       

      Maturity
      Date
	
       

      Principal
      Amount
	
       

      Interest
      Rate

	
       

      2004
	
       

      July 1,
      2025
	
       

      $35,000,000
	
       

                *      

 

The bonds of
Environmental Improvement Series 2004 shall be payable, as to both principal and
interest, in immediately available funds, at the office or agency of the Trust
Indenture Trustee, in any coin or currency of the United States of America which
at the time of payment is legal tender for public and private debts.

 

______________________

*    As determined in accordance with the Series 2004 Trust
Indenture.

 

Section 1.2. 
Anything contained
in Section 14 of Article I of the Indenture, or elsewhere in the
Indenture, to the contrary notwithstanding, only the person in whose name any of
the bonds of Environmental Improvement Series 2004 is registered (the
“Registered
Owner”) at the close of
business on any Record Date, as hereinafter defined, with respect to any
Interest Payment Date shall be entitled to receive the interest payable on such
Interest Payment Date notwithstanding the cancellation of such bonds upon any
transfer or exchange subsequent to the Record Date and prior to such Interest
Payment Date; provided,
however, that if and to the
extent the Company shall default in the payment of the interest due on such
Interest Payment Date, such defaulted interest shall be paid to the persons in
whose names outstanding bonds of Environmental Improvement Series 2004 are
registered on the Record Date to be established by the Trustee for payment of
such defaulted interest.

 

Upon any payment of
the principal of, premium, if any, and interest on, all or any portion of the
Revenue Refunding Bonds Series 2004, 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 8.01 of the Series 2004 Trust Indenture,
bonds of Environmental Improvement Series 2004 in a principal amount equal to
the principal amount of such Revenue Refunding Bonds Series 2004 and having both
a corresponding maturity date and interest rate 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 bonds of Environmental Improvement Series 2004 shall be surrendered to the
Trustee for delivery to the Company for cancellation as provided in
Section 8.02 of the Series 2004 Trust Indenture. The Trustee may at anytime
and all times conclusively assume that the obligation of the Company to make
payments with respect to the principal of and premium, if any, and interest on
the Revenue Refunding Bonds Series 2004, 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 Trust Indenture Trustee signed by one of its officers stating
(i) the timely payment of principal, or premium or interest on, the Revenue
Refunding Bonds Series 2004 has not been made, (ii) that the Company is in
arrears as to the payments required to be made by it to the Trust Indenture
Trustee pursuant to the Series 2004 Trust Indenture, and (iii) the amount
of the arrearage.

 

Section 1.3. 
The
term “Record Date” as used herein with respect to any Interest Payment Date
(other than an Interest Payment Date for the payment of defaulted interest)
shall mean the applicable Record Date, next preceding such Interest Payment
Date, as determined in accordance with the Series 2004 Trust Indenture
referred to in the form of bond, or, if such Record Date shall be a legal
holiday or a day on which banking institutions in the City of Chicago, Illinois,
are authorized by law to close, then the next preceding day which shall not be a
legal holiday or a day on which such institutions are so authorized to
close.

 

Section
1.4. 
The
bonds of Environmental Improvement Series 2004 are not redeemable except on
the respective dates, in the respective principal amounts and for the respective
redemption prices that correspond to the redemption dates for, the principal
amounts to be redeemed of, and the redemption prices for, the Revenue Refunding
Bonds Series 2004, and except as set forth in Section 1.5
hereof.

 

In the event that
the Company redeems any Revenue Refunding Bonds Series 2004 bonds prior to
maturity in accordance with the provisions of the Series 2004 Trust
Indenture, the Trust Indenture Trustee shall on the same date deliver to the
Company the bonds of Environmental Improvement Series 2004 in principal
amounts corresponding to the Revenue Refunding Bonds Series 2004 so
redeemed, as provided in Section 8.02 of the Series 2004 Trust
Indenture. The Company agrees to give the Trust Indenture Trustee notice of any
such redemption of the Revenue Refunding Bonds Series 2004 on or before the
date fixed for any such redemption.

 

Section
1.5. 
Upon
the occurrence of an Event of Default under the Series 2004 Trust Indenture
and the acceleration of the Revenue Refunding Bonds Series 2004, the bonds
of Environmental Improvement Series 2004 shall be redeemable in whole upon
receipt by the Trustee of a written demand (hereinafter called a “Redemption
Demand”) from the Trust
Indenture Trustee stating that there has occurred under the Series 2004
Trust Indenture both an Event of Default and a declaration of acceleration of
payment of principal, accrued interest and premium, if any, on the Revenue
Refunding Bonds Series 2004 specifying the last date to which interest on
such Revenue Refunding Bonds Series 2004 has been paid (such date being
hereinafter referred to as the “Initial
Interest Accrual Date”) and demanding
redemption of the bonds of Environmental Improvement Series 2004. The
Company waives any right it may have to prior notice of such redemption under
the Indenture. Upon surrender of the bonds of Environmental Improvement
Series 2004 by the Trust Indenture Trustee to the Trustee, the bonds of
Environmental Improvement Series 2004 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 date of the Redemption Demand;
provided,
however, that in the event
of a rescission or annulment of acceleration of Revenue Refunding Bonds
Series 2004 pursuant to Section 9.02(b) of the Series 2004 Trust
Indenture, then any Redemption Demand shall thereby deemed to be rescinded by
the Trust Indenture Trustee although no such rescission or annulment shall
extend to or affect any subsequent default or impair any right consequent
thereon.

 

Section 1.6. 
The bonds of
Environmental Improvement Series 2004 shall not be assignable or
transferable except as permitted by Section 13.15 of the Series 2004
Trust Indenture. Any such transfer shall be effected at the principal office or
place of business of the Trustee under the Indenture. The bonds of Environmental
Improvement Series 2004 are exchangeable by the Registered Owner thereof,
in person or by attorney duly authorized, at the principal office or place of
business of the Trustee under the Indenture, upon the surrender and cancellation
of said bonds and the payment of any stamp tax or other governmental charge, and
upon any such exchange a new registered bond or bonds without coupons, of the
same series and maturity and for the same aggregate principal amount, will be
the same series and maturity and for the same aggregate principal amount, will
be issued in exchange theretofore; and provided, that the Company
shall not be required to exchange any bonds of Environmental Improvement
Series 2004 for a period of ten (10) days next preceding an Interest
Payment Date with respect to bonds of Environmental Improvement
Series 2004.

 

The bonds of
Environmental Improvement Series 2004 shall, from time to time, be executed
on behalf of the Company and sealed with the corporate seal of the Company, all
in the manner provided or permitted by Section 6 of Article I of the
Indenture, as follows:

 

(a)  
bonds
of Environmental Improvement Series 2004 executed on behalf of the Company
by its President or a Vice-President and/or by its 

Secretary or an
Assistant Secretary may be so executed by the facsimile signature of such
President or Vice-President and/or of such Secretary or Assistant Secretary, as
the case may be, of the Company, or of any person or persons who shall have been
such officer or officers, as the case may be, of the Company on or subsequent to
the date of this supplemental indenture, notwithstanding that he or they may
have ceased to be such officer or officers of the Company at the time of the
actual execution, authentication, issue or delivery of any of such bonds, and
any such facsimile signature or signatures of any such officer or officers on
any such bonds shall constitute execution of such bonds on behalf of the Company
by such officer or officers of the Company for the purposes of the Indenture, as
hereby amended, and shall be valid and effective for all purposes, provided that all bonds
shall always be executed on behalf of the Company by the signature, manual or
facsimile, of its President or a Vice-President and of its Secretary or an
Assistant Secretary, and provided,
further, that none of such
bonds shall be executed on behalf of the Company by the same officer or person
acting in more than one capacity; and

 

   (b)  
such
corporate seal of the Company may be a facsimile, and any bonds of Environmental
Improvement Series 2004 on which such facsimile 

seal shall be
affixed, impressed, imprinted or reproduced shall be deemed to be sealed with
the corporate seal of the Company for the purposes of the Indenture, as hereby
amended, and such facsimile seal shall be valid and effective for all
purposes.

 

Section
1.7.  As provided in
Section 8.02 of the Series 2004 Trust Indenture, from and after the
Release Date (as defined in the Series 2004 Trust Indenture), the
obligations of the Company with respect to the bonds of Environmental
Improvement Series 2004 shall be deemed to be satisfied and discharged, the
bonds of Environmental Improvement Series 2004 shall cease to secure in any
manner any bonds of Revenue Refunding Bonds Series 2004 outstanding under
the Series 2004 Trust Indenture, and, pursuant to Section 8.02 of the
Series 2004 Trust Indenture, the Trust Indenture Trustee shall forthwith
deliver the bonds of Environmental Improvement Series 2004 to the Company
for cancellation. 

 

Article
II

 

Section 2.1. 
Sections 10 and 16
of Article III of the Indenture are, and each of them is, hereby amended by
striking out the words “Series X through Series Z, Series 1995-1,
Series 1997-1, Series 1997-2, Senior Notes Series AA-1, Senior
Notes Series AA-2 and Senior Notes Series BB” wherever the same occur
in each of said sections, and by inserting, in lieu thereof, the words
“Series 1995-1, Series 1997-2, Senior Notes Series AA-1, Senior
Notes Series AA-2, Senior Notes Series BB and Environmental
Improvement Series 2004” and the Company hereby covenants and agrees to
observe and comply with the provisions of said sections as hereby
amended.

 

Article
III

 

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

 

Section
3.2.  Each reference in
the Indenture, or in this supplemental indenture, to any article, section, term
or provision of the Indenture shall mean and be deemed to refer to such article,
section, term or provision of the Indenture, as hereby amended, except where the
context otherwise indicates.

 

Section
3.3.  All the covenants,
provisions, stipulations and agreements in this supplemental indenture contained
are and shall be for the sole and exclusive benefit of the parties hereto, their
successors and assigns, and of the holders and Registered Owners from time to
time of the bonds of Environmental Improvement Series 2004 and of the
coupons issued and outstanding from time to time under and secured by the
Indenture, as hereby amended, and the Trust Indenture Trustee, for the benefit
of the holder or holders of the Revenue Refunding Bonds
Series 2004.

 

This supplemental
indenture has been executed in a number of identical counterparts, each of which
so executed shall be deemed to be an original.

 

At the time of the
execution of this supplemental indenture, the aggregate principal amount of all
indebtedness of the Company outstanding, or to be presently outstanding, under
and secured by the Indenture, as hereby amended, is $340,000,000, evidenced by
First Mortgage Bonds of the series listed below, issued by the Company under
said Indenture and now outstanding or to be presently issued by it under said
Indenture, as follows:

 

	 	 	 	 
	 	 	 	
      Principal

	
       Series
	
      Interest
      Rate (%)
	
      Maturity
      Date
	
      Amount
      ($)

	 	 	 	 
	
      1995-1
	
      6.49
	
      June
      1, 2005
	
      20,000,000

	
      1997-2
	
      7.05
	
      June
      1, 2006
	
      20,000,000

	
      1997-2
	
      7.61
	
      June
      1, 2017
	
      40,000,000

	
      Senior
      Notes AA-1
	
      5.375
	
      December
      15, 2008
	 
	
      Senior
      Notes AA-2
	
      6.125%
	
      December
      15, 2028
	
      60,000,000

	
      Senior
      Notes BB
	
      6.625%
	
      June
      15, 2011
	
       150,000,000

	
      Series
      2004
	
      *
	
      July
      1, 2025
	
              
      35,000,000 (a)

	 	 	 	 
	 	
      Total........
	 	
       340,000,000

	 	 	 	 

_______________________________________

*   As determined in
accordance with the Series 2004 Trust Indenture. 

    (a) To be
presently issued by the Company under said Indenture.

 

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

 

Central Illinois
Public Service Company

 

By: /s/ Jerre E.
Birdsong                             

Jerre E.
Birdsong

Vice President and
Treasurer

(Corporate
Seal)

 

Attest:

 

By /s/ G.L.
Waters                 
 

G.L.
Waters

Assistant
Secretary

 

U.S. Bank National
Association

 

By: /s/ James P.
Vellanti                              

James P.
Vellanti

Vice
President

(Corporate
Seal)

 

Attest:

 

By /s/ Cheryl L.
Clarke            

Cheryl L.
Clarke

Assistant Vice
President

      /s/
Patrick J.
Crowley                                 
(SEAL)

          Patrick
J. Crowley

State of
Missouri          )

)  SS

City of
St. Louis          
)

 

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

 

Given under my hand
and official seal this 9th day of November,
2004, in the City and State aforesaid.

/s/ Carolyn J.
Shannon                                  
   

                        Notary
Public 

(Notarial
Seal)

State of New
York            
)

) SS

County of New
York         )

 

I, Patricia V.
Cowart, a Notary Public in and for New York County in the State aforesaid, do
hereby certify that:

 

James P.
Vellanti, a Vice President of U.S. Bank National
Association, a national
banking association, and Stacey A. Pagliaro, an Assistant Vice President of
said association, who are both personally known to me to be the same persons
whose names are subscribed to the foregoing instrument as such officers,
respectively, of said association, and who are both personally known to me to be
such officers, appeared before me this day in person and severally acknowledged
that they signed, sealed and delivered said instrument as their free and
voluntary act as such officers, and as the free and voluntary act of said
association, for the uses and purposes therein set forth.

 

Given under my hand
and official seal this 10th day of November, 2004.

/s/ Patricia V.
Cowart                           

Patricia V.
Cowart

Notary
Public

(Notarial
Seal)

 

State of New
York            
)

)SS

County of New
York         )

 

I, Sima Glater, a
Notary Public in and for New York County in the State aforesaid, do hereby
certify that:

 

Patrick J. Crowley,
personally known to me to be the same person whose name is subscribed to the
foregoing instrument, appeared before me this day in person and acknowledged
that he signed, sealed and delivered said instrument as his free and voluntary
act, for the uses and purposes therein set forth.

 

Given under my hand
and official seal this 10th day of November, 2004.

/s/ Sima
Glater                                   

Sima
Glater

Notary
Public

(Notarial
Seal)

 

Schedule
A

 

To the Supplemental
Indenture dated October 1, 2004

 

of Central Illinois
Public Service Company to

 

U.S. Bank National
Association and 

 

Patrick J. Crowley
as trustees

 

The properties of
the Company acquired through construction, purchase, consolidation or merger or
otherwise subsequent to March 31, 2001 and prior to June 1, 2004 referred to in
the foregoing Supplemental Indenture, located in the counties of Adams, Brown,
Calhoun, Champaign, Christian, Clay, Coles, Edgar, Effingham, Fulton, Jasper,
Mason, McDonough, Menard, Sangamon, and Williamson in the State of Illinois as
described as follows:

 

First. The following
described electric substation of the Company located in, or in the vicinity of,
the following community located in the State of Illinois:

 

	
      Location
	 		
	
      Community
		
      County
		
      KVA

	
      Flora
		Clay		
      5,250

 

Second. The following
described gas distribution mains of the Company located in the State of
Illinois, as follows:

	
      LOCATION
	
      APPROXIMATE

      LENGTH IN
      FEET

	
                    COMMUNITY                           
      
	
                         
      COUNTY                                           
      

	
      Marion
	
      Williamson
	
                     
      13,569

	
      Breeds
	
      Fulton
	
                     
      21,527

	
      Smithfield
      
	
      Fulton
	
                    
      2,973

	
      Hardin
	
      Calhoun
	
                       
      3,870

	
      Quincy
	
      Adams
	
       16,651

	
      Havana
	
      Mason
	
       11,907

	
      Macomb
	
      McDonough
	
      3,437

	
      New
      Berlin
	
      Sangamon
	
      3,016

	
      Forest
      City
	
      Mason
	
       26,767

	
      Petersburg
	
      Menard
	
      3,659

	
      Athens
	
      Menard
	
      4,265

	
      Mattoon
	
      Coles
	
      7,540

	
      Paris
	
      Edgar
	
      5,540

	
      Kincaid
	
      Christian
	
      3,451

	
      Effingham
	
      Effingham
	
      9,737

	
      Mt
      Sterling
	
      Brown
	
      2,700

	
      Newton
	
      Jasper
	
      5,020

	
      Cantrall-
      Andrew
	
      Sangamon
	
      6,056

 

Third. The following
described real estate situated in Clay County, Illinois (Property Index Number:
13-01-100-015; Common Street Address: No address has been
assigned.):

 

A part of Lot One
(1) of the Northeast Quarter (NE1⁄4) of the NW Quarter (NW1⁄4) of Section One (1),
Township Two North (T2N), Range Five East (R5E) of the 3rd Principal
Meridian, Clay County, Illinois, more particularly described as
follows:

 

Commencing at the
Southwest Corner of said Lot 1 of the NE 1⁄4 of the NW 1⁄4 of said Section 1, thence
N 1° 24’ 37” E, 388.31 feet along the West line of Lot 1 to the Point of
Beginning. Thence N 89° 55’ 55” E, 145.31 feet; Thence N 1° 24’ 37” E, 214.64
feet to a point on the centerline of Vincennes & St. Louis Road (Route
250); Thence S 76° 58’ 10” W, 150.00 feet along the centerline of Vincennes
& St. Louis Road (Route 250) to a point on the West line of Lot 1; Thence S
1° 24’ 37” W, 180.98 feet to the Point of Beginning, containing 0.66 acres, more
or less.

 

Fourth. The following
described real estate situated in Champaign County, Illinois (Property Index
Number: 29-26-26-458-009; Common Street Address: No address has been
assigned.):

 

Part of the
Southeast Quarter of Section 26, Township 18 North, Range 8 East of the Third
Principal Meridian, Village of Tolono, Champaign County, Illinois, more
particularly described as follows: Commencing at an iron pipe survey monument
found at the Southeast corner of the Southeast Quarter of Section 26, Township
18 North, Range 8 East of the Third Principal Meridian, Champaign County,
Illinois; thence North 89° 22’ 23” West along the South line of the Southeast
Quarter of said Section 26, a distance of 1,758.87 feet to an iron pipe survey
monument reset on the existing Westerly right of way line of the Canadian
National/Illinois Central Railroad for the point of beginning; thence North 89°
22’ 23” West along the South line of said Section 26, a distance of 175.54 feet
to an iron pipe survey monument reset on the former Westerly right of way line
of the Illinois Central Railroad; thence North 06° 50’ 58” East along the former
Westerly right of way line of the Illinois Central Railroad, a distance of
342.40 feet to an iron pipe survey monument found at the Southwesterly corner of
the State of Illinois tract as filed of record as Case Number 95-L-31 in the
Office of the Circuit Clerk of Champaign County, Illinois; thence South 46° 51’
19” East along the Southerly line of said State of Illinois Tract, a distance of
191.69 feet to an iron pipe survey monument found; thence South 83° 09’ 02” East
along the Southerly line of said State of Illinois tract, a distance of 20.00
feet to an iron pipe survey monument found on said existing Westerly right of
way line of the Canadian National/Illinois Central Railroad; thence South 06°
50’ 58” West along said existing Westerly right of way line of the Canadian
National/Illinois Central Railroad, a distance of 209.91 feet to the point of
beginning, containing 1.08 acres more or less.

 

Fifth. The following
described real estate situated in Fulton County, Illinois (Property Index
Numbers: 09-08-28-408-13 and 09-08-28-408-014; Common Street Addresses: No
addresses have been assigned.):

 

Tract
A

 

A part of the
Southeast Quarter of Section 28, Township 7 North, Range 4 East of the Fourth
Principal Meridian, Fulton County, Illinois, more particularly described as
follows and bearings are for descriptive purposes only:

 

Commencing at the
Northeast corner of the Southeast Quarter of Section 28, thence along the east
line of said Section 28 bearing South 00 degrees 34 minutes 38 seconds West, a
distance of 844.77 feet to the projection of the south right-of-way line of
Illinois State Route 9, thence along said projection and said south right-of-way
line bearing South 89 degrees 50 minutes 53 seconds West, a distance of 347.29
feet to the Point of Beginning of the parcel to be described:

 

From said Point of
Beginning, thence bearing South 00 degrees 13 minutes 43 seconds East, a
distance of 176.53 feet to the north line of Homewood Addition Block 2; thence
along said north line bearing South 89 degrees 24 minutes 34 seconds West, a
distance of 183.91 feet to the southwest corner of the City of Canton Property;
thence along the westerly line of said City of Canton Property bearing North 00
degrees 32 minutes 26 seconds East, a distance of 36.96 feet; thence continuing
along said westerly line bearing North 29 degrees 39 minutes 06 seconds East, a
distance of 162.57 feet to said south right-of-way line; thence along said south
right-of-way line bearing North 89 degrees 50 minutes 53 seconds East, a
distance of 102.42 feet; to the Point of Beginning, containing 0.615 acres more
or less.

 

Tract
B

 

A part of the
Southeast Quarter of Section 28, Township 7 North, Range 4 East of the Fourth
Principal Meridian, Fulton County, Illinois, more particularly described as
follows and bearings are for descriptive purposes only:

 

Commencing at the
Northeast corner of the Southeast Quarter of Section 28, thence along the east
line of said Section 28 bearing South 00 degrees 34 minutes 38 seconds West, a
distance of 844.77 feet to the projection of the south right-of-way line of
Illinois State Route 9, thence along said projection and said south right-of-way
line bearing South 89 degrees 50 minutes 53 seconds West, a distance of 449.71
feet; thence along said south right-of-way line bearing South 29 degrees 39
minutes 06 seconds West, a distance of 28.81 feet to the northeast corner of the
Hicksgas Canton, Inc., property and the Point of Beginning of the parcel to be
described.

 

From said Point of
Beginning, thence along the East line of said Hicksgas Canton, Inc., property
bearing South 29 degrees 39 minutes 06 seconds West, a distance of 107.79 feet
to the southeast corner of said Hicksgas Canton, Inc., property; thence along
the south line of said Hicksgas Canton, Inc., property bearing South 89 degrees
50 minutes 53 seconds West, a distance of 142.91 feet; thence bearing North 38
degrees 49 minutes 30 seconds East, a distance of 152.48 feet to said south
right-of-way line; thence along said south right-of-way line of the next three
courses bearing North 89 degrees 50 minutes 53 seconds East, a distance of 28.08
feet; thence bearing South 00 degrees 09 minutes 07 seconds East, a distance of
25.00 feet; thence bearing North 89 degrees 50 minutes 53 seconds East, a
distance of 72.50 feet to the Point of Beginning, containing 0.305 acres more or
less.

 

Permanent
Restriction. No improvements
shall be constructed upon the premises conveyed within 50 feet of the liquid
propane storage tanks now located or to be located upon Grantor’s premises
unless Grantor, its successors or assigns, has given written permission to
Grantee, its successors or assigns, to construct a particular
improvement.Supplemental Indenture to CILCO Mortgage 10-1-2005

                                                                            Exhibit 4.121

    
	
      When recorded mail to:

      

      Craig W.
      Stensland

      Central Illinois Light
      Company

      300 Liberty
      Street

      Peoria, Illinois 
      61602

      

      

      
	
      

Indenture

Between

Central Illinois
Light Company

and

Deutsche Bank
Trust Company Americas,

as successor Trustee under Indenture of Mortgage and Deed of Trust,
dated as of April 1, 1933, between Illinois Power Company and Bankers Trust
Company (predecessor of Deutsche Bank Trust Company Americas), as Trustee, as
amended and supplemented by Indenture between the same parties, dated as of
June 30, 1933, and as amended, supplemented and assumed by Indenture dated
as of July 1, 1933, between Central Illinois Light Company and Bankers
Trust Company (predecessor of Deutsche Bank Trust Company Americas), as Trustee,
and as amended and supplemented by various Indentures between the same parties
bearing subsequent dates.

Dated as of
October 1, 2004

This instrument was
prepared by Steven R. Sullivan, Senior Vice President Governmental/Regulatory
Policy, General Counsel and Secretary of Central Illinois Light Company, 300
Liberty Street, Peoria, Illinois  61602, (314) 554-2098.

Indenture dated as of the 1st day of October, 2004 (hereinafter
sometimes referred to as this Supplemental Indenture), between Central Illinois
Light Company, a corporation of the State of Illinois (hereinafter sometimes
called the Company), party of the first part, and Deutsche Bank Trust Company
Americas, a corporation of the State of New York, as successor Trustee
(hereinafter sometimes called the Trustee), party of the second part, under the
Indenture of Mortgage and Deed of Trust between Illinois Power Company and
Bankers Trust Company (predecessor of Deutsche Bank Trust Company Americas), as
Trustee, dated as of April 1, 1933, as amended and supplemented by
Indenture between said Illinois Power Company and said Bankers Trust Company
(predecessor of Deutsche Bank Trust Company Americas), dated as of June 30,
1933, and as amended, supplemented and assumed by Indenture between the Company
and said Bankers Trust Company (predecessor of Deutsche Bank Trust Company
Americas), dated as of July 1, 1933, and as amended and supplemented by
various Indentures between the Company and said Bankers Trust Company
(predecessor of Deutsche Bank Trust Company Americas) bearing subsequent dates
(said Indenture of Mortgage and Deed of Trust as amended, supplemented and
assumed being hereinafter sometimes referred to as the
“Indenture”).

Whereas, the Indenture provides for the issuance of bonds thereunder
in one or more series, the form of which series of bonds to be substantially in
the form set forth therein with such insertions, omissions and variations as the
Board of Directors of the Company may determine; and

Whereas, the Company, by appropriate corporate action in conformity
with the terms of the Indenture, has duly determined to create a series of bonds
under the Indenture to be designated as “First Mortgage Bonds, Environmental
Improvement Revenue Refunding Series I due 2039” (hereinafter sometimes
referred to as the “bonds of the Thirtieth Series”), the bonds of which
series are to be issued as registered bonds without coupons and are to bear
interest as specified in the form of bond of the Thirtieth Series set forth
below and are to mature, subject to prior acceleration and redemption, on
October 1, 2039; and

Whereas, the definitive registered bonds without coupons of the
Thirtieth Series (certain of the provisions of which may be printed on the
reverse side thereof) and the Trustee’s certificate of authentication to be
borne by such bonds are to be substantially in the following forms,
respectively:

 

[General
Form of Registered Bond of the Thirtieth Series]

No.
____                                                                                                                                                                                $________

_______________

      
Notwithstanding any Provisions Hereof or in the Indenture this Bond is Not
Assignable or Transferable Except as Permitted or Required By Section 13.15
of the Indenture of Trust Dated as of October 1, 2004, Between the Illinois
Finance Authority and UMB Bank, N.A., as Trustee

Central
Illinois Light Company

First
Mortgage Bond, Environmental Improvement Revenue 
Refunding Series I Due
2039

Due
October 1, 2039

Illinois
Commerce Commission
Identification
No.:  Ill. C.C.
6338

Central Illinois Light Company, a corporation of the State of
Illinois (hereinafter called the “Company”), for value received, hereby
promises to pay to UMB Bank, N.A., as trustee under the Authority Bond Indenture
hereinafter referred to, or registered assigns, on October 1, 2039, subject
to prior redemption, Nineteen Million Two Hundred Thousand Dollars in lawful
money of the United States of America, and to pay to the registered owner hereof
interest thereon in lawful money of the United States of America at the same
rate or rates of interest as the Authority Bonds (as determined in accordance
with the Authority Bond Indenture referred to below), but in no event shall the
interest rate on this bond exceed eighteen percent (18%) per annum. 
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
Authority Bonds.  Interest on this bond is payable on the same dates as
interest on the Authority Bonds, or, if this bond shall be duly called for
redemption, until the redemption date, or if the Company shall default in the
payment of the principal hereof, until the Company’s obligation to pay principal
shall be discharged as provided in the Mortgage (hereinafter mentioned) is paid,
until the principal sum is paid in full.  The principal of, and interest
on, this bond are payable, in immediately available funds, at the office of the
Authority Bond Trustee hereinafter referred to.

Under an Indenture of Trust dated as of October 1, 2004 (the
“Authority Bond Indenture”) between the Illinois Finance Authority (the
“Authority”) and UMB Bank, N.A., as trustee (the “Authority Bond
Trustee”), the Authority has issued its Environmental Improvement Revenue
Refunding Bonds (AmerenCILCO Project) Series 2004 in the aggregate principal
amount of $19,200,000 (the “Authority Bonds”).  The Company has
agreed to pay the principal of, premium, if any, and interest on the Authority
Bonds pursuant to a Loan Agreement dated as of October 1, 2004 (the
“Agreement”) between the Company and the Authority.  Pursuant
to

 

Section 4.08 of the Agreement, this bond is issued to the
Authority Bond Trustee to secure any and all obligations of the Company under
the Agreement with respect to payment of the Authority Bonds.  Payment of
principal of, or interest on, the Authority Bonds shall constitute payments on
this bond as further provided herein and in the Supplemental Indenture dated as
of October 1, 2004 pursuant to which this bond has been issued.

Upon any payment of the principal of, and interest on, all or any
portion of the Authority Bonds, whether at maturity or otherwise or upon
provision for the payment thereof having been made in accordance with
Section 8.01 of the Authority Bond Indenture, a principal amount of this
bond equal to the principal amount of such Authority Bonds shall, to the extent
of such payment of principal 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, such bonds shall be surrendered to
the Company for cancellation as provided in Section 8.02 of the Authority
Bond Indenture.  The Trustee may at any time and all times conclusively
assume that the obligation of the Company to make payments under the Agreement
with respect to the principal of, and interest on, the Authority Bonds, 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 Authority Bond Trustee signed by one of
its officers stating (i) that timely payment of principal of, or interest
on, the Authority Bonds has not been made, (ii) that the Company is in
arrears as to the payments required to be made by it to the Authority Bond
Trustee pursuant to the Agreement, and (iii) the amount of the
arrearage.

This bond is one of an issue of bonds of the Company, issuable in
series, and is one of a series known as its First Mortgage Bonds of the series
designated in its title, all issued and to be issued under and equally secured
(except as to any sinking fund established in accordance with the provisions of
the Mortgage (defined below) for the bonds of any particular series) by an
Indenture of Mortgage and Deed of Trust dated as of April 1, 1933, executed
by Illinois Power Company to Bankers Trust Company (predecessor of Deutsche Bank
Trust Company Americas) or its successor (hereinafter sometimes referred to as
the “Trustee”) as Trustee, as amended by Indenture dated as of
June 30, 1933, as assumed by the Company and as amended and supplemented by
Indentures between the Company and the Trustee bearing subsequent dates,
including the Indenture dated as of October 1, 2004 (all of which
indentures are herein collectively called the “Mortgage”), to which
reference is made for a description of the property mortgaged and pledged, the
nature and extent of the security, the rights of the holders of the bonds in
respect thereof and the terms and conditions upon which the bonds are
secured.

As more fully described in the supplemental indenture establishing
the terms and provisions of the bonds of this series, the Company reserves the
right, without any consent or other action by holders of the bonds of this
series, to amend the Mortgage to provide that:  the Mortgage, the rights
and obligations of the Company and the rights of the bondholders may be modified
with the consent of the holders of not less than 60% in principal amount of the
bonds adversely affected; provided, however, that no modification shall
(1) extend the time, or reduce the amount, of any payment on any bond,
without the consent of the holder of each bond so affected, (2) permit the
creation of any lien, not otherwise permitted, prior to or on a parity with the
lien of the Mortgage, without the consent of the holders of all bonds then
outstanding, or 

 

(3) reduce the above percentage of the principal amount of bonds
the holders of which are required to approve any such modification without the
consent of the holders of all bonds then outstanding.

The principal hereof may be declared or may become due on the
conditions, with the effect, in the manner and at the time set forth in the
Mortgage, upon the occurrence of a completed default as in the Mortgage
provided.

This bond is, subject to the provisions of the Mortgage, subject to
redemption in the amounts, at the times, at the prices and under the
circumstances set forth in the Authority Bond Indenture for the redemption of
the Authority Bonds.

As more fully provided in the Mortgage, bonds of this series shall be
redeemed by the Company as a whole, at the principal amounts of the bonds so to
be redeemed and accrued interest to the date of redemption, upon receipt by the
Trustee of a written demand from the Authority Bond Trustee, stating that the
principal amount of all Authority Bonds then outstanding under the Authority
Bond Indenture has been declared due and payable.  The date fixed for such
redemption shall be specified in a notice of redemption to be given not more
than five days after receipt by the Trustee of the aforesaid written demand and
shall be a date not less than 30 and not more than 45 days after the date of
such notice unless the holders of all of the bonds of this series have agreed to
a shorter notice period, in which case the date of redemption of this bond shall
be the first day following the end of such shorter notice period.  Upon any
such redemption, or upon an acceleration of the maturity of this bond after the
occurrence of a completed default under the Mortgage (provided such acceleration
has not been annulled pursuant to the terms of the Mortgage), the date from
which unpaid interest on the Authority Bonds has then accrued (as specified by
the Authority Bond Trustee) shall become the interest payment date from which
interest on this bond shall be paid (herein referred to as the “Interest
Payment Date”).  As in the Mortgage provided, the aforesaid notice of
redemption shall be rescinded and become null and void for all purposes under
the Mortgage (including the fixing of the Interest Payment Date with respect to
the bonds of this series) upon rescission of the aforesaid written demand and
thereupon no redemption of the bonds of this series and no payments in respect
thereof as specified in such notice of redemption shall be effected or
required.

The bonds of this series are issuable as registered bonds without
coupons in denominations of $5,000 and authorized multiples of $5,000.  In
the manner and upon payment of the charges prescribed in the Mortgage,
registered bonds without coupons of this series may be exchanged for a like
aggregate principal amount of fully registered bonds of other authorized
denominations of the same series, upon presentation and surrender thereof, for
cancellation, to the Trustee at its principal office in the Borough of
Manhattan, The City of New York, New York.

Subject to the restriction on transfer of this bond hereinbefore set
forth, this bond is transferable as prescribed in the Mortgage by the registered
owner hereof in person, or by his duly authorized attorney, at the office or
agency of the Company in the Borough of Manhattan, The City of New York, New
York, upon surrender and cancellation of this bond, and, thereupon, 

 

a new fully registered bond of the same series for a like principal
amount will be issued to the transferee in exchange therefor as provided in the
Mortgage, and upon payment, if the Company shall require it, of the charges
therein prescribed.

As provided in Section 8.02 of the Authority Bond Indenture,
from and after the Release Date (as defined in the Authority Bond Indenture),
the obligations of the Company with respect to this bond shall be deemed to be
satisfied and discharged, this bond shall cease to secure in any manner the
Company’s obligations under the Agreement with respect to the payment of any
Authority Bonds outstanding under the Authority Bond Indenture, and, pursuant to
Section 8.02 of the Authority Bond Indenture, the Authority Bond Trustee
shall forthwith deliver this bond to the Company for cancellation.

No recourse shall be had for the payment of the principal of or
interest on this bond against any incorporator or any past, present or future
subscriber to the capital stock, stockholder, officer or director of the Company
or of any predecessor or successor corporation, either directly or through the
Company or any predecessor or successor corporation, under any rule of law,
statute or constitution or by the enforcement of any assessment or otherwise,
all such liability of incorporators, subscribers, stockholders, officers and
directors being released by the holder or owner hereof by the acceptance of this
bond and being likewise waived and released by the terms of the
Mortgage.

This bond shall not become obligatory until Deutsche Bank Trust
Company Americas, the Trustee under the Mortgage, or its successor thereunder,
shall have signed the form of certificate endorsed hereon.

In Witness Whereof, Central Illinois Light Company has caused this
bond to be signed in its name by its President or a Vice President by a
facsimile of his signature and a facsimile of its corporate seal to be printed
hereon, attested by its Secretary or an Assistant Secretary by a facsimile of
his signature.

Dated:

Central Illinois Light Company

[Seal]

By__________________________________ 

[President]

 

Attest:

____________________________________

                           
[Secretary]

 

[Form of
Trustee’s Certificate]

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

Deutsche Bank Trust Company Americas,

  as
Trustee

By__________________________________ 

Authorized Officer

and

Whereas, all things necessary to make the bonds of the Thirtieth
Series, when authenticated by the Trustee and issued as in the Indenture
provided, the valid, binding and legal obligations of the Company, entitled in
all respects to the security of the Indenture, have been done and performed, and
the creation, execution and delivery of this Supplemental Indenture have in all
respects been duly authorized; and

Whereas, the Company and the Trustee deem it advisable to enter into
this Supplemental Indenture for the purpose of describing the bonds of the
Thirtieth Series, and of providing the terms and conditions of redemption
thereof;

Now, Therefore, This Supplemental Indenture Witnesseth:  That
Central Illinois Light Company, in consideration of the premises and of one
dollar to it duly paid by the Trustee at or before the unsealing and delivery of
these presents, the receipt whereof is hereby acknowledged, and of the purchase
and acceptance of the bonds issued or to be issued hereunder by the holders or
registered owners thereof, and in order to secure the payment both of the
principal and interest of all bonds at any time issued and outstanding under the
Indenture, according to their tenor and effect, and the performance of all of
the provisions of the Indenture and of said bonds, hath granted, bargained,
sold, released, conveyed, assigned, transferred, pledged, set over and confirmed
and by these presents doth grant, bargain, sell, release, convey, assign,
transfer, pledge, set over and confirm unto Deutsche Bank Trust Company
Americas, as Trustee, and to its successor or successors in said trust, and to
it and their assigns forever, all the properties of the Company located in the
State of Illinois described in Schedule A (which is identified by the signature
of an officer of each party hereto at the end thereof) hereto annexed and made a
part hereof.

And all other property, real, personal and mixed, tangible and
intangible of the character described in the granting clauses of the aforesaid
Indenture of Mortgage and Deed of Trust dated as of April 1, 1933 or in any
indenture supplemental thereto acquired by the Company on or after the date of
the execution and delivery of said Indenture of Mortgage and Deed of Trust
(except any in said Indenture of Mortgage and Deed of Trust or in any indenture
supplemental thereto expressly excepted) now owned or hereafter acquired by the
Company and wheresoever situated.

 

 

Together with all and singular the tenements, hereditaments and
appurtenances belonging or in any wise appertaining to the aforesaid property or
any part thereof, with the reversion and reversions, remainder and remainders
and (subject to the provisions of Article XI of the Indenture) the tolls,
rents, revenues, issues, earnings, income, product and profits thereof, and all
the estate, right, title and interest and claim whatsoever, at law as well as in
equity, which the Company now has or may hereafter acquire in and to the
aforesaid property and franchises and every part and parcel thereof.

To Have and to Hold all such properties, real, personal and mixed,
mortgaged, pledged or conveyed by the Company as aforesaid, or intended so to
be, unto the Trustee and its successors and assigns forever.

In Trust, Nevertheless, upon the terms and trusts of the Indenture,
for those who shall hold the bonds and coupons issued and to be issued
thereunder, or any of them, without preference, priority or distinction as to
lien of any of said bonds and coupons over any others thereof by reason of
priority in the time of the issue or negotiation thereof, or otherwise
howsoever, subject, however, to the provisions in reference to extended,
transferred or pledged coupons and claims for interest set forth in the
Indenture (and subject to any sinking funds that may be created for the benefit
of any particular series).

Provided, However, and these presents are upon the condition
that, if the Company, its successors or assigns, shall pay or cause to be paid,
the principal of and interest on said bonds, at the times and in the manner
stipulated therein and herein, and shall keep, perform and observe all and
singular the covenants and promises in said bonds and in the Indenture expressed
to be kept, performed and observed by or on the part of the Company, then this
Supplemental Indenture and the estate and rights hereby granted shall cease,
determine and be void, otherwise to be and remain in full force and
effect.

It Is Hereby Covenanted, Declared and Agreed by the Company that all
such bonds and coupons, if any, are to be issued, authenticated and delivered,
and that all property subject or to become subject hereto is to be held, subject
to the further covenants, conditions, uses and trusts in the Indenture set
forth, and the Company, for itself and its successors and assigns, does hereby
covenant and agree to and with the Trustee and its successor or successors in
such trust, for the benefit of those who shall hold said bonds and interest
coupons, or any of them, as follows:

Section 1.     The bonds of the
Thirtieth Series shall mature, subject to prior acceleration and redemption, on
the date appearing in the form of bond hereinbefore set forth, shall (subject to
the provisions of Section 2 hereof) bear interest at the same rate or rates
of interest as the Authority Bonds hereinafter mentioned, and shall be
designated as the Company’s First Mortgage Bonds of the series hereinbefore set
forth.  Both principal of and interest on the bonds shall be payable in
lawful money of the United States of America at the office of the Authority Bond
Trustee hereinafter mentioned.

Definitive bonds of the Thirtieth Series will be issued, originally
or otherwise, only as registered bonds without coupons; and they and the
Trustee’s certificate of authentication shall 

 

 

be substantially in the forms hereinbefore recited,
respectively.  Registered bonds of the Thirtieth Series may be issued in
any one or more denominations of $5,000 and authorized multiples of
$5,000.  In the manner and upon payment of the charges prescribed in the
Indenture, registered bonds without coupons of the Thirtieth Series may be
exchanged for a like aggregate principal amount of fully registered bonds of
other authorized denominations of the same series, upon presentation and
surrender thereof for cancellation, to the Trustee at its principal office in
the Borough of Manhattan, The City of New York, New York.  However,
notwithstanding the provisions of Section 14 of the Indenture, no charge
shall be made upon any transfer or exchange of bonds of said series other than
for any tax or taxes or other governmental charge required to be paid by the
Company.

Bonds of the Thirtieth Series shall be redeemed by the Company, as a
whole, in the manner provided in Article X of the Indenture, at the
principal amounts of the bonds so to be redeemed and accrued interest to the
date of redemption, upon receipt by the Trustee of a written demand for such
redemption (hereinafter called the “Redemption Demand”) from the
Authority Bond Trustee under the Indenture of Trust (the “Authority Bond
Indenture”) dated as of October 1, 2004 between the Illinois Finance
Authority and UMB Bank, N.A., as trustee (said trustee and any successor thereto
being hereinafter referred to as the “Authority Bond Trustee”), stating
that the principal amount of all Environmental Improvement Revenue Refunding
Bonds (AmerenCILCO Project) Series 2004 (the “Authority Bonds”) then
outstanding under the Authority Bond Indenture, has been declared due and
payable pursuant to the provisions of Section 9.02 of the Authority Bond
Indenture, specifying the date from which unpaid interest on the Authority Bonds
has then accrued and stating that such declaration of maturity has not been
rescinded.  The Trustee shall, within five days of receiving the Redemption
Demand and after informing the Company of such receipt, fix a redemption date
for the redemption so demanded (which date shall be the first day after the
notice period for redemptions required by the Indenture, or otherwise agreed to
by the holders of all of the bonds of the Thirtieth Series, has expired) and
shall mail notice of the date fixed for redemption of the bonds of the Thirtieth
Series (hereinafter called the “Notice”) to the Authority Bond Trustee
and to the registered holder or holders of the bonds of the Thirtieth Series,
provided, however, that the Trustee shall not mail the Notice (and no
redemption of the bonds of the Thirtieth Series shall be made) if prior to the
mailing of the Notice, the Trustee shall have received written notice of
rescission of the Redemption Demand from the Authority Bond Trustee. 
Redemption of the bonds of the Thirtieth Series as above provided shall be at
the principal amount thereof, plus accrued interest thereon to the date fixed
for redemption and such amount shall become due and payable on such date fixed
for redemption.  Anything contained in this paragraph to the contrary
notwithstanding, if, after mailing of the Notice and prior to the date fixed for
redemption of the bonds of the Thirtieth Series, the Trustee shall have been
advised in writing by the Authority Bond Trustee that the Redemption Demand has
been rescinded, the Notice shall thereupon, without further act of the Trustee
or the Company, be rescinded and become null and void for all purposes hereunder
(including the fixing of the Interest Payment Date (as defined in the bonds of
the Thirtieth Series)) and no redemption of the bonds of the Thirtieth Series
and no payments with respect thereof as specified in the Notice shall be
effected or required

Section 2.     Except as provided
below in connection with the Release Date, the principal amount of bonds of the
Thirtieth Series outstanding from time to time shall always be equal to

 

the principal amount of the Authority Bonds which are outstanding
from time to time under the Authority Bond Indenture and to the extent the
Authority Bond Trustee holds bonds of the Thirtieth Series in excess of such
principal amount, such bonds of the Thirtieth Series shall be deemed cancelled
and retired and no longer outstanding under the Indenture.

The bonds of the Thirtieth Series are, subject to the provisions of
the Indenture, subject to redemption in the amounts, at the times, at the prices
and under the circumstances under which the Authority Bonds are subject to
redemption, under the same terms and conditions set forth in the Authority Bond
Indenture for the redemption of the Authority Bonds.  In the event that
less than all the bonds of the Thirtieth Series are to be redeemed, the bonds of
the Thirtieth Series to be redeemed shall be determined by lot in such manner as
the Trustee in its discretion shall deem proper, as in the Indenture
provided.

The bonds of
the Thirtieth Series are also subject to mandatory redemption as set forth in
Section 1 of this Supplemental Indenture.

As provided
in Section 8.02 of the Authority Bond Indenture, from and after the Release
Date (as defined in the Authority Bond Indenture), the obligations of the
Company with respect to the bonds of the Thirtieth Series shall be deemed to be
satisfied and discharged, the bonds of the Thirtieth Series shall cease to
secure in any manner the Company’s obligations under the Agreement with respect
to the payment of any Authority Bonds outstanding under the Authority Bond
Indenture, and, pursuant to Section 8.02 of the Authority Bond Indenture,
the Authority Bond Trustee shall forthwith deliver the bonds of the Thirtieth
Series to the Company for cancellation.  

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

Section 3.     The Company reserves
the right, without any consent or other action by holders of the bonds of the
Thirtieth Series, or any subsequent series of bonds, to amend the Indenture by
inserting the following language as Section 115A immediately following
current Section 115 of the Indenture:

           
“Section 115A.  With the consent of the holders of not less than sixty
per centum (60%) in principal amount of the bonds at the time outstanding or
their attorneys‐in‐fact duly authorized, or, if the rights of the holders of one
or more, but not all, series then outstanding are affected, the consent of the
holders of not less than sixty per centum (60%) in aggregate principal amount of
the

 

 bonds at the time outstanding of all affected series, taken
together, and not any other series, the Company, when authorized by a
resolution, and the Trustee may from time to time and at any time enter into an
indenture or indentures supplemental hereto for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
this Indenture or of any supplemental indenture or modifying the rights and
obligations of the Company and the rights of the holders of any of the bonds and
coupons; provided, however, that no such supplemental indenture shall
(1) extend the maturity of any of the bonds or reduce the rate or extend
the time of payment of interest thereon, or reduce the amount of the principal
thereof, or reduce any premium, payable on the redemption thereof or change the
coin or currency in which any bond or interest thereon is payable, without the
consent of the holder of each bond so affected, or (2) permit the creation
of any lien, not otherwise permitted, prior to or on a parity with the lien of
this Indenture, without the consent of the holders of all the bonds then
outstanding, or (3) reduce the aforesaid percentage of the principal amount
of bonds the holders of which are required to approve any such supplemental
indenture, without the consent of the holders of all the bonds then
outstanding.  For the purposes of this Section, bonds shall be deemed to be
affected by a supplemental indenture if such supplemental indenture adversely
affects or diminishes the rights of holders thereof against the Company or
against its property.

           
Upon the written request of the Company, accompanied by a resolution authorizing
the execution of any such supplemental indenture, and upon the filing with the
Trustee of evidence of the consent of bondholders as aforesaid (the instrument
or instruments evidencing such consent to be dated within one year of such
request), the Trustee shall join with the Company in the execution of such
supplemental indenture unless such supplemental indenture affects the Trustee’s
own rights, duties or immunities under this Indenture or otherwise, in which
case the Trustee may in its discretion but shall not be obligated to enter into
such supplemental indenture.  The Trustee shall be entitled to receive and,
subject to Section 102 of the Indenture and Article Four of the
Supplemental Indenture dated as of April 1, 1940, may rely upon, an opinion
of counsel as conclusive evidence that any such supplemental indenture is
authorized or permitted by the provisions of this Section.

            It
shall not be necessary for the consent of the bondholders under this Section to
approve the particular form of any proposed

 

 supplemental indenture, but it shall be sufficient if such
consent shall approve the substance thereof.

           
The Company and the Trustee, if they so elect, and either before or after such
60% or greater consent has been obtained, may require the holder of any bond
consenting to the execution of any such supplemental indenture to submit his
bond to the Trustee or to such bank, banker or trust company as may be
designated by the Trustee for the purpose, for the notation thereon of the fact
that the holder of such bond has consented to the execution of such supplemental
indenture, and in such case such notation, in form satisfactory to the Trustee,
shall be made upon all bonds so submitted, and such bonds bearing such notation
shall forthwith be returned to the persons entitled thereto.  All
subsequent holders of bonds bearing such notation shall be deemed to have
consented to the execution of such supplemental indenture, and consent, once
given or deemed to be given, may not be withdrawn.

           
Prior to the execution by the Company and the Trustee of any supplemental
indenture pursuant to the provisions of this Section, the Company shall publish
a notice, setting forth in general terms the substance of such supplemental
indenture, at least once in one daily newspaper of general circulation in each
city in which the principal of any of the bonds shall be payable, or, if all
bonds outstanding shall be registered bonds without coupons or coupon bonds
registered as to principal, such notice shall be sufficiently given if mailed,
first class, postage prepaid, and registered if the Company so elects, to each
registered holder of bonds at the last address of such holder appearing on the
registry books, such publication or mailing, as the case may be, to be made not
less than thirty days prior to such execution.  Any failure of the Company
to give such notice, or, any defect therein, shall not, however, in any way
impair or affect the validity of any such supplemental indenture.”

Section 4.     As supplemented and
amended by this Supplemental Indenture, the Indenture is in all respects
ratified and confirmed, and this Supplemental Indenture and all the terms and
conditions herein contained shall be deemed a part thereof.

Section 5.     Except as herein
otherwise expressly provided, no duties, responsibilities or liabilities are
assumed, or shall be construed to be assumed, by the Trustee by reason of this
Supplemental Indenture, other than as set forth in the Indenture as heretofore
amended and supplemented.  The Trustee shall not be responsible for the
recitals herein or in the bonds (other than in the authentication certificate of
the Trustee), all of which are made by the Company solely.

        

 

Section 6.     This Supplemental
Indenture may be executed in several counterparts, and all such counterparts
executed and delivered, each as an original, shall constitute but one and the
same instrument.

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

Central Illinois Light Company

By  /s/  Jerre E. Birdsong_________________

      Name:  Jerre E.
Birdsong

      Title:    Vice
President and Treasurer

[Seal]

Attest:

/s/ 
G.L. Waters________________________

Name: 
G.L. Waters

Title: 
Assistant Secretary

Deutsche Bank Trust Company Americas, as Trustee

By  /s/  Susan Johnson___________________

      Name:  Susan Johnson

      Title:    Vice
President

[Seal]

Attest:

/s/ 
Irina Golovashchuk__________________

Name: 
Irina Golovashchuk

Title:    Associate

State of
Missouri     )

                                   
)  SS

City of
St. Louis       )

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

Given under
my hand and official seal this 9th day of November, 2004, in the City
and State aforesaid.

                                                                                 
/s/  Carolyn J.
Shannon                                       

                                                                                 
        
              
Notary Public 

(Notarial Seal)

 

State of New
York        )

                                         
)     SS

County of New
York     )

I, Boris
Treyger, a Notary Public in and for New York County in the State aforesaid, do
hereby certify that:

Susan
Johnson, a Vice President of Deutsche Bank Trust Company Americas, and Irina
Golovashchuk, an Associate of said corporation, who are both personally known to
me to be the same persons whose names are subscribed to the foregoing instrument
as such officers, respectively, of said corporation, and who are both personally
known to me to be such officers, appeared before me this day in person and
severally acknowledged that they signed, sealed and delivered said instrument as
their free and voluntary act as such officers, and as the free and voluntary act
of said corporation, for the uses and purposes therein set forth.

Given under
my hand and official seal this 10th day of November, 2004.

/s/  Boris
Treyger                                                         

         
________________________________

                               
Notary Public

(Notarial Seal) 

Schedule
A

Detailed
Description of Additional Properties

McLean County

A part of Lot 3 as shown in Plat Book 7 on Page 195, said Lot 3 being
a part of Taylor and Woltman’s survey and subdivision of that part of the East
Half of Section 9, Township 21 North, Range 1 West of the Third Principal
Meridian, McLean County, Illinois which lies north and west of the Chicago and
Alton Railroad, now the Southern Pacific Line Railroad, described as
follows:

Commencing at a pipe found at the southeast corner of said Section 9;
thence N0o00’00”E along the east section line a distance of 833.32 feet to a
nail set on the northwesterly Right of Way of the Southern Pacific Line
Railroad, said point being the Point of Beginning; thence S42o38’53”W along said
Right of Way a distance of 516.61 feet to a 5/8” pin set; thence N0o00’00”E a
distance of 779.88 feet to a 5/8” pin set; thence S90o00’00”E a distance of
350.00 feet to a nail set; thence S0o00’00”E along the east line of said Section
9 a distance of 400.00 feet to the Point of Beginning, containing 4.740 acres,
more or less.

Part PIN
23-33-09-400-003

Knox County

Lot Numbered One (1) of RAMP SUBDIVISION, being a Subdivision of part
of Lot Twenty-four (24) in the Subdivision of 1898 recorded in Volume 1 of
Plats, Page 208, of the East Half of the Southeast Quarter of Section Eleven
(11), Township Nine (9) North, Range Four (4) East of the Fourth Principal
Meridian, per Plat recorded in Volume 28 of Plats, Page 44; Subject to all
Easements, Rights of Way, Dedications, Restrictions and Covenants, of Record,
affecting the real estate, if any, and to all applicable Zoning Ordinances and
Restrictions, situated in the County of Knox, in the sate of
Illinois.

PIN 20-11-426-012

Tazewell County 

A part of the Southwest Quarter of Section 19, Township 25 North,
Range 3 West of the Third P.M., being more particularly described as
follows:  Commencing at the center of Section 19; thence South 01o48’33”
East (bearing assumed for purpose of description only), along the East line of
the Southwest Quarter of Section 19, 767.85 feet to the Point of Beginning of
the tract to be described:  From the Point of Beginning, thence South
01o48’33” East, along the East line of the Southwest Quarter of said Section 19,
242 feet; thence South 88o11’27” West, 360 feet; thence North 01o48’33” West 242
feet thence North 88o11’27” East, 360 feet to the Point of 

 

Beginning, situated in Tazewell County, Illinois as shown by a Plat
recording in Plat Book VV, Page 80.

PIN 06-06-19-300-002

Peoria County 1

A part of the Southeast Quarter
of Section Eight, Township 9 North, Range 7 East of the Fourth Principal
Meridian, more particularly described as follows:

Commencing at the center of said Section Eight, thence South 00
degrees 12 minutes 12 seconds West, (bearing assumed for purpose of description
only), along the West line of  the Southeast Quarter of said Section Eight,
100.00 feet to the Point of Beginning of the tract to be described:  from
the Point of Beginning, thence South 89 degrees 16 minutes 51 seconds East,
parallel to and 100.00 feet normally distant Southerly from the North line of
the Southeast Quarter of said Section Eight, 360.01 feet to a point 360.00 feet
normally distant  Easterly from the West line of the Southeast Quarter of
said Section Eight; thence South 00 degrees 12 minutes 12 seconds West, 240.01
feet to a point 340.00 feet normally distant Southerly from the North line of
the Southeast Quarter of said Section Eight; thence North 89 degrees 16 minutes
51 seconds West, 360.01 feet to the West line of the Southeast Quarter of said
Section Eight; thence North 00 degrees 12 minutes 12 seconds East, along said
West line, 240.01 feet to the Point of Beginning, said Tract containing 1.984
acre, more or less, said tract being subject to that portion previously
dedicated for public road Right of Way of Gilles Road.

Part of PIN
13-08-400-003

Peoria County 2

A part of Lot Five (5) in the Subdivision of the Southwest Quarter
(SW1/4) of Section Twenty Two (22), Township Nine (9) North, Range Eight (8)
East of the Fourth Principal Meridian as per Plat Book “D”, Page 48, in the
Recorder’s Office of Peoria County, Illinois, more particularly bounded and
described as follows, to-wit:  Commencing at a point on the North line of
Toledo Avenue Two Hundred and Eighty Four (284) feet East of the West line of
said Lot Five (5); thence at right angles North Three Hundred Feet (300’) more
or less to the South line of the premises deeded to the National Implement and
Vehicle Show on August 9, 1912, as shown by Deed recorded in Book 294 of Deeds,
page 351, in the Recorder’s Office of said County:  thence East along the
South line thereof Forty Six and ninety four one hundredths (46.94) feet: 
thence at right angles South Three Hundred (300) feet, more or less to the north
line of Toledo Avenue; thence West 46.94 feet, to the place of
beginning.

PIN 14-22-304-007

Peoria County 3

A part of the West half of the Southwest quarter of section
twenty-five (25), Township ten (10) North, Range seven (7) East of the fourth
principal meridian, being more particularly described as follows:

Commencing at the Southwest corner of the Southwest quarter of said
section 25, thence North 89o-59’-36” East, (Bearing assumed for purpose of
description only), along the South line of the Southwest quarter of said section
25, 260.23 feet to a point on the Easterly Right of Way line of the Chicago
& Northwestern Railroad, said point being hereafter referred to as point
“A”, said point being also the point of beginning of the tract to be
described:  from the point of beginning thence North 01o-27’-33” West,
along said Easterly Right of Way line, 683.00 feet; thence North 89o-59’-36”
East, 300.00 feet; thence South 01o-27’-33” East, 350.00 feet; thence South
89o-59-36” West, 224.98 Feet; Thence South 01o-27’-33” East, along a line 75.00
feet normally distant Easterly of the Easterly Right of Way line of said Chicago
& Northwestern Railroad, 333.00 feet to the South line of the Southwest
quarter of said section 25; thence South 89o-59’-36” West, along said South
line, 75.02 feet to the point of beginning, said tract containing 2.983 acres,
more or less, said tract being subject to public road Right of Way along the
South side of said tract for Alta Lane (Illinois Route 174), said tract being
also subject to an easement for ingress-egress and utilities for the benefit of
to a 3.218 acre tract lying North of and adjacent to the above described tract,
said easement being more particularly described as follows:

Beginning at the aforementioned point “A”, thence North 01o-27’-33”
West, along the Easterly Right of Way line of said Chicago & Northwestern
Railroad, 683.00 feet; thence North 89o-59’-36” East, 30,01 feet; thence South
01o-27’-33” East, 683.00 feet to the South line of the Southwest quarter of said
section 25; thence South 89o-59’-36” West, along said South line, 30.01 feet to
the point of beginning.

Parcel is shown on Plat of Survey dated December 3, 2003 and recorded
December 16, 2003 in the Peoria County Recorder of Deeds Office in Tract Survey
39, Page 68, as Document No. 03-61003

Part of PIN
08-25-300-003

Peoria County 4

A part of the West half of the Southwest quarter of section
twenty-five (25), township ten (10) North, range seven (7) East of the fourth
principal meridian, being more particularly described as follows:

Commencing at the Southwest corner  of the Southwest quarter of
said section 25, thence North 89o-59’-36” East, (bearing assumed for the purpose
of description only), along the South line of the Southwest quarter of said
section 25, 260.23 feet to a point on the Easterly Right of Way line of the
Chicago & Northwestern Railroad, said point being hereafter referred to as
point “A”; thence North 01o-27’-33” West, along said Easterly Right of Way line,
683.00 feet to the point of 

 

beginning of the tract to be described:  from the point of
beginning thence North 01o-27’-33” West, along said Easterly Right of Way line
2003.09 feet to the North line of the Southwest quarter of said section 25;
thence South 89o-34’-17” East, along said North line, 70.04 feet; thence South
01o-27’-33” East, along a line 70.00 feet normally distant Easterly of the
Easterly Right of Way line of said Chicago & Northwestern Railroad, 2002.55
feet; thence South 89o-59’-36” West, 70.02 feet to the point of beginning, said
tract containing 3.218 acres, more or less.  Together with a easement for
ingress-egress and utilities over the following thence North 01o-27’-33” 
West, along the Easterly Right of Way line of said Chicago & Northwestern
Railroad, 683.00 feet; thence North 89o-59’-36” East, 30.01 feet; thence South
01o-27’-33” East, 683.00 feet to the South line of the Southwest quarter of said
section 25; thence South 89o-59’-36” West, along said South line 30.01 feet to
the point of beginning.

Parcel is shown on Plat of Survey dated December 3, 2003 and recorded
December 16, 2003 in the Peoria County Recorder of Deeds Office in Tract Survey
39, Page 68, as Document No. 03-61003

Part of PIN
08-25-300-003

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