EXHIBIT 10.2

                                  THIRD AMENDED
                            AMEREN CORPORATION SYSTEM
                          UTILITY MONEY POOL AGREEMENT


     This UTILITY MONEY POOL  AGREEMENT made and entered into on the 25th day of
March,  1999, as amended September 15, 2003, October 20, 2003, and September 30,
2004 by and among Ameren Corporation  ("Ameren"),  a Missouri  corporation and a
registered holding company under the Public Utility Holding Company Act of 1935,
as amended (the "Act"); Ameren Services Company ("Ameren Services"),  a Missouri
corporation and a subsidiary service company of Ameren;  Union Electric Company,
doing business as AmerenUE  ("AmerenUE"),  a Missouri  corporation and a utility
subsidiary of Ameren; Central Illinois Public Service Company, doing business as
AmerenCIPS  ("AmerenCIPS"),  an Illinois corporation and a utility subsidiary of
Ameren,   Central   Illinois  Light  Company,   doing  business  as  AmerenCILCO
("AmerenCILCO"),  an Illinois  corporation and an indirect utility subsidiary of
Ameren  ,  AmerenEnergy  Resources  Generating  Company  ("AERG"),  an  Illinois
corporation and direct  subsidiary of  AmerenCILCO,  and Illinois Power Company,
doing business as AmerenIP  ("AmerenIP"),  an Illinois  corporation  and utility
subsidiary of Ameren, (each a "Party" and collectively, the "Parties").

     WHEREFORE,  the  Parties  from time to time have need to borrow  funds on a
short-term basis, and some of the Parties from time to time are expected to have
funds available to loan on a short-term basis;

     WHEREAS, by the Utility Money Pool Agreement  ("Agreement") dated March 25,
1999 all of the Parties,  except AmerenCILCO , AERG and AmerenIP,  established a
pool (the "Utility  Money Pool") to coordinate  and provide for certain of their
short-term cash and working capital requirements;

     WHEREAS,  on January  31,  2003  Ameren  acquired  CILCORP  Inc.  including
AmerenCILCO;

     WHEREAS,  the  Agreement  dated March 25, 1999 was amended on September 15,
2003 to add  AmerenCILCO  as a party to the Utility Money Pool and to make minor
changes to the Utility Money Pool Agreement;

     WHEREAS,   effective  October  3,  2003,  AmerenCILCO  transferred  certain
electric  generating  assets to AERG and AERG commenced  operations as a "public
utility" as defined by the Act;

     WHEREAS, AERG is not a utility under Illinois law;

     WHEREAS,  the Agreement  dated March  25,1999,  as amended on September 15,
2003,  was further  amended on October 20,  2003,  to add AERG as a party to the



Agreement  and to allow AERG to be a lender to,  but not a  borrower  from,  the
Utility Money Pool;

     WHEREAS,  on September 30, 2004,  Ameren  acquired  Illinois Power Company,
which then commenced doing business as AmerenIP; and

     WHEREAS, the Parties desire to add AmerenIP as a party to the Utility Money
Pool and the Agreement.

     NOW THEREFORE,  in consideration  of the premises,  and the mutual promises
set forth herein, the Parties hereto agree as follows:

     ARTICLE I
     CONTRIBUTIONS AND BORROWINGS

     Section 1.1  Contributions to Utility Money Pool. Each Party will determine
each day, on the basis of cash flow projections and other relevant  factors,  in
such  Party's  sole  discretion,  the  amount  of  funds  it has  available  for
contribution  to the Utility Money Pool, and will  contribute  such funds to the
Utility Money Pool. The determination of whether a Party at any time has surplus
funds to lend to the Utility Money Pool or shall lend funds to the Utility Money
Pool will be made by such Party's  Treasurer,  or by a designee thereof,  on the
basis of cash flow projections and other relevant factors,  in such Party's sole
discretion.  Each Party may withdraw any of its funds at any time upon notice to
Ameren Services as administrative agent of the Utility Money Pool.

     Section 1.2 Rights to Borrow.  Subject to the  provisions of Section 1.4(b)
of this Agreement, short-term borrowing needs of the Parties, with the exception
of Ameren and AERG,  may be met by funds in the Utility Money Pool to the extent
such funds are available. Each Party (other than Ameren and AERG) shall have the
right to make  short-term  borrowings  from the Utility  Money Pool from time to
time,  subject to the  availability  of funds and the limitations and conditions
set forth herein and in the  applicable  orders of the  Securities  and Exchange
Commission  ("SEC").   AmerenUE's   aggregate  principal  amount  of  borrowings
outstanding  at any one time from the Utility Money Pool will be limited to $500
million.  Each Party  (other than  Ameren and AERG) may  request  loans from the
Utility  Money Pool from time to time  during the  period  from the date  hereof
until  this  Agreement  is  terminated  by  written  agreement  of the  Parties;
provided, however, that the aggregate amount of all loans requested by any Party
hereunder  shall  not  exceed  the  applicable  borrowing  limits  set  forth in
applicable  orders  of  the  SEC  and  other  relevant  regulatory  authorities,
resolutions of such Party's  shareholders  and Board of Directors,  such Party's
governing corporate documents,  and agreements binding upon such Party. No Party
shall be obligated to borrow from the Utility Money Pool if lower cost funds can
be obtained  from  external  borrowing.  No loans through the Utility Money Pool
will be made to, and no  borrowings  through the Utility Money Pool will be made
by, Ameren or AERG.



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     Section  1.3  Source of Funds.  (a) Funds  will be  available  through  the
Utility Money Pool from the  following  sources for use by the Parties from time
to time: (i) surplus funds in the treasuries of Parties other than Ameren,  (ii)
surplus funds in the treasury of Ameren, and (iii) proceeds from bank borrowings
and the sale of commercial paper by Parties ("External  Funds"), in each case to
the extent  permitted by applicable  laws and regulatory  orders.  Funds will be
made  available  from such  sources in such other order as Ameren  Services,  as
administrator  of the Utility Money Pool,  may determine  will result in a lower
cost of borrowing to Parties  borrowing from the Utility Money Pool,  consistent
with the  individual  borrowing  needs and  financial  standing  of the  Parties
providing funds to the Utility Money Pool.

     (b)  Borrowing  Parties will borrow pro rata from each lending Party in the
proportion that the total amount loaned by such lending Party bears to the total
amount then loaned through the Utility Money Pool. On any day when more than one
fund source (e.g., surplus treasury funds of Ameren and other Utility Money Pool
participants  ("Internal  Funds") and External  Funds),  with different rates of
interest,  is used to fund loans through the Utility Money Pool,  each borrowing
Party will borrow pro rata from each fund source in the same proportion that the
amount of funds  provided  by that  fund  source  bears to the  total  amount of
short-term funds available in the Utility Money Pool.

     Section 1.4 Authorization. (a) Each loan shall be authorized by the lending
Party's Treasurer, or by a designee thereof.

     (b) All  borrowings  from the Utility Money Pool shall be authorized by the
borrowing  Party's  Treasurer,  or by a  designee  thereof.  No  Party  shall be
required  to effect a borrowing  through  the  Utility  Money Pool if such Party
determines  that it can (and is  authorized  to) effect such  borrowing at lower
cost directly from banks or through the sale of its own  commercial  paper in an
existing commercial paper program.

     Section 1.5  Interest.  Each Party  receiving a loan shall accrue  interest
monthly on the unpaid  principal  amount of such loan in the Utility  Money Pool
from the date of such loan until such principal amount shall be paid in full.

     (a) If only  Internal  Funds  comprise  the funds  available in the Utility
Money Pool,  the interest rate  applicable to loans of such Internal Funds shall
be the CD yield  equivalent  of the 30-day  Federal  Reserve "AA"  Non-Financial
commercial  paper  composite rate (or, if no such rate is  established  for that
day, then the  applicable  rate shall be the rate for the next preceding day for
which such rate was established).

     (b) If only  External  Funds  comprise  the funds  available in the Utility
Money Pool,  the interest rate  applicable to loans of such External Funds shall
be equal to the lending  Party's cost for such External  Funds (or, if more than
one Party had made available External Funds on such day, the applicable interest
rate  shall be a  composite  rate,  equal to the  weighted  average  of the cost
incurred by the respective Parties for such External Funds).


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     (c) In cases where both Internal Funds and External Funds are  concurrently
borrowed  through  the  Utility  Money Pool,  the rate  applicable  to all loans
comprised  of such  "blended"  funds  shall be a  composite  rate,  equal to the
weighted  average of the (i) cost of all Internal  Funds  contributed by Parties
(as  determined  pursuant to Section 1.5(a) above) and (ii) the cost of all such
External Funds (as determined pursuant to Section 1.5(b) above);  provided, that
in circumstances where Internal Funds and External Funds are available for loans
through the Utility  Money Pool,  loans may be made  exclusively  from  Internal
Funds or External Funds, rather than from a "blend" of such funds, to the extent
it is expected that such loans would result in a lower cost of borrowing.

     Section 1.6 Certain Costs.  The cost of  compensating  balances and/or fees
paid to banks to maintain credit lines by Parties lending  External Funds to the
Utility Money Pool shall initially be paid by the Party maintaining such line. A
portion  of such  costs  shall be  retroactively  allocated  every  month to the
Parties  borrowing  such  External  Funds  through  the  Utility  Money  Pool in
proportion to their  respective  daily  outstanding  borrowings of such External
Funds.

     Section 1.7 Repayment.  Each Party  receiving a loan hereunder  shall repay
the principal  amount of such loan,  together with all interest accrued thereon,
on demand  and in any event  within  one year of the date on which such loan was
made.  All loans  made  through  the  Utility  Money  Pool may be prepaid by the
borrower without premium or penalty.

     Section  1.8 Form of Loans to  Parties.  Loans to the  Parties  through the
Utility Money Pool will be made  pursuant to  open-account  advances,  repayable
upon  demand  and in any  event not  later  than one year  after the date of the
advance;  provided,  that each  lending  Party shall at all times be entitled to
receive upon demand one or more promissory notes evidencing any and all loans by
such  lender.  Any such note shall:  (a) be  substantially  in the form filed as
Exhibit B to the Form U-1  Application-Declaration  in File No. 70-9423,  (b) be
dated as of the date of the initial borrowing, (c) mature on demand or on a date
agreed by the  Parties to the  transaction,  but in any event not later than one
year after the date of the applicable  borrowing,  and (d) be repayable in whole
at any time or in part from time to time, without premium or penalty.

     ARTICLE II
     OPERATION OF UTILITY MONEY POOL

     Section  2.1  Operation.  Operation  of the Utility  Money Pool,  including
record keeping and  coordination  of loans,  will be handled by Ameren  Services
under the authority of the appropriate officers of the Parties.  Ameren Services
shall be responsible for the determination of all applicable  interest rates and
charges to be applied  to  advances  outstanding  at any time  hereunder,  shall
maintain records of all advances, interest charges and accruals and interest and
principal  payments for purposes  hereof,  and shall  prepare  periodic  reports
thereof for the Parties.  Ameren Services will administer the Utility

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Money  Pool on an "at  cost"  basis.  Separate  records  shall be kept by Ameren
Services for the Utility Money Pool  established by this agreement and any other
money pool administered by Ameren Services.

     Section 2.2  Investment of Surplus  Funds in the Utility Money Pool.  Funds
not  required  to meet  Utility  Money Pool loans (with the  exception  of funds
required  to satisfy the  Utility  Money  Pool's  liquidity  requirements)  will
ordinarily be invested in one or more  short-term  investments,  including:  (i)
interest-bearing  accounts with banks; (ii) obligations  issued or guaranteed by
the  U.S.  government  and/or  its  agencies  and  instrumentalities,  including
obligations under repurchase agreements;  (iii) obligations issued or guaranteed
by any state or political  subdivision  thereof,  provided that such obligations
are  rated  not less  than A by a  nationally  recognized  rating  agency;  (iv)
commercial  paper  rated  not  less  than A-1 or P-1 or  their  equivalent  by a
nationally   recognized  rating  agency;  (v)  money  market  funds;  (vi)  bank
certificates of deposit and bankers acceptances;  (vii) Eurodollar  certificates
of deposit or time deposits; (viii) investment grade medium term notes, variable
rate  demand  notes and  variable  rate  preferred  stock;  and (ix) such  other
investments  as are  permitted by Section 9(c) of the Act and Rule 40 thereunder
but only if also  permitted  by either  applicable  rule or order by each  state
commission having  jurisdiction over such investments or by applicable  statutes
of each such state.

     Section 2.3  Allocation of Interest  Income and  Investment  Earnings.  The
interest income and other investment  income earned by the Utility Money Pool on
loans and  investment  of surplus  funds will be allocated  among the Parties in
accordance with the proportion each Party's contribution of funds in the Utility
Money Pool bears to the total amount of funds in the Utility  Money Pool and the
cost of any  External  Funds  provided to the Utility  Money Pool by such Party.
Interest  and other  investment  earnings  will be computed on a daily basis and
settled once per month.

     Section 2.4 Event of  Default.  If any Party  shall  generally  not pay its
debts as such debts  become due, or shall admit in writing its  inability to pay
its debts  generally,  or shall  make a general  assignment  for the  benefit of
creditors, or any proceeding shall be instituted by or against any Party seeking
to adjudicate it a bankrupt or insolvent, then the other Parties may declare the
unpaid principal amount of any loans to such Party, and all interest thereon, to
be forthwith due and payable and all such amounts shall forthwith become due and
payable.

     ARTICLE III
     MISCELLANEOUS

     Section 3.1  Amendments.  No amendment to this  Agreement  shall be adopted
except in a writing executed by the Parties.

     Section 3.2 Legal Responsibility. Nothing herein contained shall render any
Party liable for the  obligations  of any other Party  hereunder and the rights,
obligations  and


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liabilities  of the  Parties  are several in  accordance  with their  respective
obligations, and not joint.

     Section  3.3  Governing  Law.  This  Agreement  shall be  governed  by, and
construed in accordance with, the laws of the State of Missouri.

     IN  WITNESS  WHEREOF,  the  undersigned  companies  have duly  caused  this
document to be signed on their behalf on the date of amendment  written above by
the undersigned thereunto duly authorized.


AMEREN CORPORATION


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


AMEREN SERVICES COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


UNION ELECTRIC COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


CENTRAL ILLINOIS PUBLIC SERVICE COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


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CENTRAL ILLINOIS LIGHT COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


AMERENENERGY RESOURCES GENERATING COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


ILLINOIS POWER COMPANY


By     /s/ Jerre E. Birdsong
      ------------------------------------
Name:  Jerre E. Birdsong
Title: Vice President and Treasurer


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