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|---------------------------------------------------------|
| AMEREN CORPORATION                                 |
|  DEFERRED      COMPENSATION PLAN FOR MEMBERS  |
|  OF THE BOARD OF DIRECTORS                    |
|  2009 Document                           |
|                                                    |

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| 1.   | PURPOSE |
|----------------|---------|

| 2.   | DEFINITIONS |
|----------------|-------------|

| A.   | Common Stock      Award:  Shares of Ameren common stock awarded to a      Participant pursuant to the provisions of the Ameren Corporation 2006      Omnibus Incentive Compensation Plan in the Participant’s capacity as a      member of the Board of Directors ofAmeren. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| B.   | Deferral      Account:  Book entries reflecting each Participant’s      Deferred Amounts and Earnings credited thereon pursuant to the provisions      of Section 6.  A separate Deferral Account shall be maintained      for each Deferral Commitment commenced  hereunder. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| C.   | Deferral      Commitment:  The sum of Director Retainer Fee, Meeting      Stipend and/or Common Stock Award deferrals to which the Participant      obligates himself pursuant to the provisions of Section  4. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| D.   | Deferred      Amount:  The amount of Director’s Retainer Fees, Meeting      Stipends and Common Stock Awards which a Participant elects to defer      pursuant to the provisions of thePlan. |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| E.   | Director's Retainer      Fee:  The monthly fee paid to a Participant in his      capacity as a member of the Board of Directors of Ameren or a committee      thereof (including for service as lead director or committee chairperson),      exclusive of any other amounts paid byAmeren. |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| F.   | Earnings:  In      the case of Deferred Amounts attributable to a Common Stock Award, the      amount of the increase or diminution in value in such Deferred Amounts      determined pursuant to Section 7 based on the performance of Ameren common      stock.  In the case of all other Deferred Amounts, the amount of      Interest which shall be credited to a Participant’s Deferred Amounts as      determined pursuant to Section 7. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| G.   | Effective      Date:  August 1,1986. |
|----------------|------------------------------------------------|

| H.   | Meeting      Stipend:  The amount paid to the Director for attending      Board and Board committee meetings, as well as any other amounts paid to      the Director for his or her service as a Director other than Common Stock      Awards and Director’s RetainerFees. |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| I.   | Participant:  Any      member of the Board of Directors of Ameren who elects or has elected to      defer a portion of his Director’s Retainer Fee, Meeting Stipend and/or      Common Stock Award pursuant to the provisions of the Plan, and for whom      the Company maintains one or more Deferral Accounts pursuant to the      provisions of the Plan. |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| J.   | Plan:  The      Ameren Corporation Deferred Compensation Plan for Members of the Board of      Directors, as revised and restated. |
|----------------|----------------------------------------------------------------------------------------------------------------------------------------------|

| K.   | Plan      Year:  The 12-month period commencing January 1 and      ending on December 31, except in the case of the 1986 Plan Year in      which case the 5-month period commencing August 1, 1986 and ending on      December 31, 1986. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| L.   | Retirement:  Ceasing      to be a member of the Board of Directors of Ameren for any reason after      attainment of at least age 55. |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------|

| 3.   | ELIGIBILITY |
|----------------|-------------|

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| 4.   | COMMENCING A DEFERRAL      COMMITMENT |
|----------------|---------------------------------------|

| 5.   | TERMS OF DEFERRAL      ELECTION |
|----------------|---------------------------------|

| 6.   | PARTICIPANT DEFERRAL      ACCOUNT |
|----------------|-----------------------------------|

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| 7.   | EARNINGS ON DEFERRED      AMOUNTS AND MANNER OFDISTRIBUTION |
|----------------|-------------------------------------------------------------|

| 1.   | With      respect to the deferrals attributable to a Participant’s Director Retainer      Fee and/or Meeting Stipend, interest calculated at the rate or rates      described below shall accrue from the date deferrals are credited to the      Participant’s Deferral Account and shall be compounded annually and      credited to the Participant’s Deferral Account as of the last business day      of each Plan Year (or as of such other dates as determined by the Company)      for which the Participant has a Deferral Account balance.  While      the Participant is a member of the Board of Directors of Ameren, the      Participant’s Deferral Account balance attributable to a Participant’s      Director Retainer Fee and/or Meeting Stipend shall accrue Earnings at the      “Plan Interest Rate.”  After Retirement from the Board of      Directors or following the death of the Participant, the Participant’s      Deferral Account balance attributable to a Participant’s Director Retainer      Fee and/or Meeting Stipend shall accrue Earnings at the “Base Interest      Rate.” |
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| 2.   | All      deferrals of Common Stock Awards shall be converted to Stock      Units.  For purposes of this Plan, the term “Stock Unit” shall      mean a book entry in a Participant’s Deferral Account representing each      share of Ameren common stock awarded to the Participant under the Ameren      Corporation 2006 Omnibus Incentive Compensation Plan and deferred pursuant      to this Plan.  At no time shall Stock Units be considered actual      shares of Ameren common stock and Participants shall have no rights as an      Ameren shareholder with respect to any Stock Units until shares of Ameren      common stock are delivered in accordance with this Plan; provided that      Participants shall have the right to receive dividend equivalents as      provided below. |
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| 8.   | DISTRIBUTION AT      RETIREMENT |
|----------------|---------------------------------|

| 1.         | The      balance of Participant’s Deferral Account to be distributed in a single      lump sum.                                                                            |
|----------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                               |                                                                                                                                                                             |
| 2.                                                 | The      balance of the Participant’s Deferral Account to be distributed in      substantially equal installments over a period of 5 years commencing at      Retirement.  |
|                                               |                                                                                                                                                                             |
| 3.                                                 | The      balance of the Participant’s Deferral Account to be distributed in      substantially equal installments over a period of 10 years commencing at      Retirement. |
|                                               |                                                                                                                                                                             |
| 4.                                                 | The      balance of the Participant’s Deferral Account to be distributed in      substantially equal installments over a period of 15 years commencing at      Retirement. |

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| B. | Subsequent Election      Changes: |
|----|-----------------------------------|

|   | In      accordance with the procedures established by the Company, a Participant      may elect to change his method of distribution with respect to Deferral      Commitments related to years prior to 2009, with respect to amounts not      otherwise payable in 2008, if such an election is made no later than      December 31, 2008. |
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|   | On      and after January 1, 2009, a Participant may elect to change his method of      distribution with respect to one or more Deferral Accounts in accordance      with rules established by the Company.  If a Participant makes      such election, then (a) such election shall not take effect until at least      12 months after the date on which such election is made, and submitted to      the Company; (b) the first payment with respect to which such election is      made shall be deferred for a period of not less than 5 years from the date      such payment would otherwise have been made; (c) any election related to a      payment that was otherwise to be made at a specified time may not be made      less than 12 months prior to the date of the first scheduled payment; and      (d) with respect to a change in payment form, such change may not      impermissibly accelerate the time or schedule of any payment under the      Plan, except as provided in regulations promulgated by the Secretary of      Treasury. |
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| 9. | TERMINATION PRIOR TO      BECOMING ELIGIBLE FORRETIREMENT |
|----|-----------------------------------------------------------|

| A.   | General: |
|----------------|----------|

| B.   | Change of      Control: |
|----------------|-------------------------|

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| 10.   | TOTAL DISABILITY OF      PARTICIPANT |
|-----------------|--------------------------------------|

| 11.   | DEATH OF      PARTICIPANT |
|-----------------|---------------------------|

|   | In      the event of the Participant’s death prior to his Retirement, the Company      shall commence distribution of the Participant’s Deferral Account(s) to      the Participant’s designated beneficiary(ies) according to the method(s)      selected by the Participant pursuant to Section 8 as soon as      administratively feasible but no later than 30 days after the month in      which the Participant’s deathoccurs. |
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| B.   | After      Retirement |
|----------------|-----------------------|

|   | In      the event of the Participant’s death after Retirement, the Company shall      continue to make distributions over the remainder of the period(s) that      would have been applicable to the Participant had he survived except that      such continuing distributions shall be made to the Participant’s      designated beneficiary(ies). |
|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 12.   | HARDSHIP      DISTRIBUTIONS |
|-----------------|-----------------------------|

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| 13.   | DESIGNATION OF      BENEFICIARY |
|-----------------|---------------------------------|

| 1.     | The      Participant’s lawful spouse.                                                    |
|--------|------------------------------------------------------------------------------------------------|
|   |
| 2.     | The      Participant’s surviving children, equally.                                      |
|   |
| 3.     | The      Participant’s surviving parents, equally.                                       |
|   |
| 4.     | The      Participant’s surviving brothers and sisters, equally.                          |
|   |
| 5.     | The      Participant’s personal representative(s), executor(s) or      administrator(s). |

| 14.   | PAYMENTS TO MINORS OR      INCOMPETENTS |
|-----------------|-----------------------------------------|

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| 15.   | ADMINISTRATION |
|-----------------|----------------|

| 16.   | MISCELLANEOUS |
|-----------------|---------------|

| A.   | Right of      Setoff:  If, at such time as the Participant becomes      entitled to distributions hereunder, the Participant has any debt,      obligation or other liability representing an amount owing to Ameren or      any of its subsidiaries, and if such debt, obligation, or other liability      is due and owing at the time that distributions are payable hereunder,      Ameren Services may offset the amount owing it against the amount      otherwise distributable hereunder; provided, however, that effective      January 1, 2008, the amount of the offset may not exceed $5,000 during any      calendar year and the offset must be made at the same time and in the same      amount as the debt, obligation or other liability would have been due and      collected from the Participant. |
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| B.   | No Trust      Created:  The arrangements hereunder are unfunded for tax      purposes and for the purposes of ERISA, Title I.  Nothing      contained in the Plan, and no action taken pursuant to its provisions      shall create, or be construed to create, a trust, escrow of any kind, or a      fiduciary relationship between Ameren and the Participant, his designated      beneficiary(ies), other beneficiaries of the Participant or any other      person. |
|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| C.   | Unsecured General      Creditor Status:  Distributions to the Participant or his      designated beneficiary(ies) or any other beneficiary(ies) hereunder shall      be made from assets which prior to distribution shall continue, for all      purposes, to be a part of the general corporate assets and no person      (including Participants) shall have any interest in such assets, including      without limitation the proceeds of life or other insurance policies, by      virtue of the provisions of the Plan.  To the extent that any      person, including the Participant, acquires a right to receive      distributions under the provisions hereof, such right shall be no greater      than the right of any unsecured general creditor of Ameren and the      obligation to pay constitutes a mere promise of Ameren to make payments in      the future. |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| D.   | Recovery of      Costs:  In the event that, in its discretion, Ameren      purchases an insurance policy or policies insuring the life of a      Participant or any other property to allow Ameren to recover the costs of      providing deferred compensation in whole or in part, hereunder, neither      the Participant, his beneficiary(ies) nor any other person or persons      shall have any rights therein whatsoever.  Ameren shall be the      sole owner and beneficiary of any such insurance policy and shall possess      and may exercise all incidents of ownership  therein. |
|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| E.   | Protective      Provisions:  A Participant shall cooperate with the      Company by providing all information requested, including a medical      history.  In connection therewith, the Company reserves the      right to require that the Participant submit to a physical examination if      such examination is deemed to be necessary or appropriate.  The      costs of all such physical examinations will be paid by the      Company.  If the Participant refuses to cooperate with the      Company, the Company shall have no further obligation to the Participant      under the provisions of the Plan.  If the Participant makes any      material misstatement of information or non-disclosure of medical history,      then no benefits shall be payable to the Participant or beneficiary(ies)      over and above his actualdeferrals. |
|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| F.   | No Contract of      Services:  Nothing contained herein shall be construed to      confer upon the Participant the right to continue to serve on the Board of      Directors of Ameren in his present capacity, or in any capacity for any      term of years.  It is expressly understood that the Plan relates      to the payment of deferred compensation for the Participant’s director      services normally distributable after termination of such services, and      the Plan is not in any way intended to be a contract for the Participant’s      services. |
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| G.   | Spendthrift      Provisions:  Neither the Participant, his      beneficiary(ies), nor any other person or persons shall have any power or      right to sell, alienate, attach, garnish, transfer, assign, anticipate,      pledge or otherwise encumber any part or all of a Deferral Account      maintained or distributable hereunder.  No amounts hereunder      shall be subject to seizure by any creditor of the Participant or a      beneficiary, beneficiary(ies) or any other person or persons by a      proceeding at law or in equity, nor shall such amounts be transferable by      operation of law in the event of divorce, legal separation, bankruptcy,      insolvency or death of the Participant, his beneficiary(ies), or any other      person or persons.  Any such attempted assignment or transfer      shall be null and void. |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| H.   | Suspension,      Termination and Amendment:  The Board of Directors of      Ameren Corporation shall have the power to suspend contributions to the      Plan or terminate the Plan in whole or in part at any time, and from      time-to-time to extend, modify, amend or revise the Plan in such respects      as the Board of Directors by resolution may deem advisable, provided that      (1) no such extension, modification, amendment or revision shall deprive a      Participant, or any beneficiary(ies) thereof, of any part or all of the      Participant’s Deferral Account and (2) no attempt to suspend contributions      to the Plan or terminate the Plan shall be effective unless such      suspension or termination complies with the restrictions and requirements      applicable under Code Section 409A and the regulations promulgated      thereunder in effect at the time of such suspension or      termination.  Subject to the foregoing, this Plan document      supersedes all previous similar Plandocuments. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| I.   | Conflicts:  Any      conflict in the language or terms or interpretation of the language or      terms of the Plan between this Plan document and any other document (other      than the Ameren Corporation 2006 Omnibus Incentive Compensation Plan or      any award agreement issued thereunder) which purports to describe the      rights, benefits, duties or obligations of any Participant, Ameren or any      other person or entity shall be |
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| J.   | Validity:  In      the event any provision of the Plan is held invalid, void, or      unenforceable, the same shall not affect, in any respect whatsoever, the      validity of any other provision of thePlan. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| K.   | Captions:  The      captions of the articles and sections of the Plan are for convenience only      and shall not control nor affect the meaning or construction of any of its      provision. |
|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| L.   | Gender and      Plurals:  Wherever used in the Plan, words in the      masculine gender shall include masculine or feminine gender, and unless      the context otherwise requires, words in the singular shall include the      plural, and words in the plural shall include the  singular. |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| M.   | Notice:  Any      election, beneficiary designation, notice, consent or demand required or      permitted to be given under the provisions of the Plan shall be in writing      and shall be signed by the Participant.  If such election,      beneficiary designation, notice, consent or demand is mailed by a      Participant, it shall be sent by United States Certified Mail, postage      prepaid, and addressed to the Chief Human Resources Officer, Ameren      Corporation, P. O. Box 66149, St. Louis,      Missouri  63166-6149.  The date of such mailing shall      be deemed to be the date of such notice, consent or  demand. |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| N.   | Governing      Law:  The Plan, and the rights of the parties hereunder,      shall be governed by and construed in accordance with the laws of the      State of Missouri. |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| O.                  | Disputes:  Time      shall be of the essence in determining whether any payments are due to the      Participant or his beneficiary(ies) under the Plan.  Therefore,      a Participant or his beneficiary(ies) may submit any claim for payment      under the Plan or dispute regarding the interpretation of the Plan to      arbitration.  This right to select arbitration shall be solely      that of the Participant or his beneficiary(ies), and the Participant or      his beneficiary(ies) may decide whether or not to arbitrate in his sole      discretion.  The “right to select arbitration” is not mandatory      on the Participant or his beneficiary(ies), and the Participant or      beneficiary(ies) may choose in lieu thereof to bring an action in an      appropriate civil court.  Once an arbitration has commenced,      however, it may not be discontinued without the mutual consent of the      Participant or beneficiary(ies) and the Company.  During the      lifetime of the Participant, only the Participant can use the arbitration      procedure set forth herein. |
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| P.                   | Ameren Corporation      2006 Omnibus Incentive Compensation Plan:  References      herein to the Ameren Corporation 2006 Omnibus Incentive Compensation Plan      and the Amended and Restated Ameren Corporation Change of Control      Severance Plan shall include the same as each such plan may be      supplemented, amended or restated from time to time or any respective      successor plan thereto. |
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