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      Ameren Corporation Form S-8
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">As
      filed
      with the Securities and Exchange Commission on August 29, 2006</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Registration
      No. 333-_____</font></div>
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      AND EXCHANGE COMMISSION</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
      D.C. 20549</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">____________________</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>FORM
      S-8</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">REGISTRATION
      STATEMENT </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UNDER
      </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">THE
      SECURITIES ACT OF 1933</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">____________________</font></div>
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            <td valign="top" width="25%">&#160;</td>
            <td valign="top" width="40%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman"><strong>AMEREN
                CORPORATION</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(Exact
                name of registrant as specified in its charter)</em></font></div>
            </td>
            <td valign="top" width="25%">&#160;</td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Missouri</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(State
                or other jurisdiction of</em></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>incorporation
                or organization)</em></font></div>
            </td>
            <td valign="top" width="40%">&#160;</td>
            <td valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>43-1723446</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(I.R.S.
                Employer</em></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>Identification
                No.)</em></font></div>
            </td>
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      </table>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1901
      Chouteau Avenue</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">St.
      Louis, Missouri 63103</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(314)
      621-3222</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(Address,
      including zip code, and telephone number, including </em></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>area
      code, of registrant&#8217;s principal executive offices)</em></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">____________________</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
      Corporation Savings Investment Plan</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(Full
      title of the plan)</em></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div>
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            <td valign="top" width="58%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">WARNER
                L. BAXTER</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Executive
                Vice President and Chief Financial Officer</font></div>
            </td>
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          <tr>
            <td valign="top" width="58%">&#160;</td>
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            <td valign="top" width="58%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">STEVEN
                R. SULLIVAN</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
                Vice President, General Counsel and Secretary</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1901
                Chouteau Avenue</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">St.
                Louis, Missouri 63103</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(314)
                621-3222</font></div>
            </td>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>(Names
      and address, including zip code, and telephone number, </em></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>including
      area code, of agents for service)</em></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>CALCULATION
      OF REGISTRATION FEE</strong></font></div>
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      <table border="1" bordercolor="black" cellpadding="0" cellspacing="0" width="100%">

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            <td valign="bottom" width="26%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Title
                of Each Class of Securities</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>to
                be Registered</strong></font></div>
            </td>
            <td valign="bottom" width="16%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Amount
                to be </strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Registered
                (1) (2) (3)</strong></font></div>
            </td>
            <td valign="bottom" width="15%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Proposed
                Maximum</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Offering
                Price</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Per
                Share (3)</strong></font></div>
            </td>
            <td valign="bottom" width="16%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Proposed
                Maximum</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Aggregate</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Offering
                Price (4)</strong></font></div>
            </td>
            <td valign="bottom" width="16%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Amount
                of</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Registration
                Fee (5)</strong></font></div>
            </td>
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            <td valign="top" width="26%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Common
                Stock, $.01 par value (including associated preferred share purchase
                rights)</font></div>
            </td>
            <td valign="top" width="16%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">3,000,000
                shares</font></div>
            </td>
            <td valign="top" width="15%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$51.90</font></div>
            </td>
            <td valign="top" width="16%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$155,700,000</font></div>
            </td>
            <td valign="top" width="16%" style="border-bottom: black double;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">$16,660</font></div>
            </td>
          </tr>

      </table>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
                addition, pursuant to Rule 416(a) under the Securities Act of 1933,
                this
                registration statement also covers such indeterminable number of
                additional securities as may become deliverable as a result of stock
                splits, stock dividends or similar transactions, in accordance with
                the
                provisions of the employee benefit plan described
                herein.</font></div>
            </td>
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      </table>
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
                addition, pursuant to Rule 416(c) under the Securities Act of 1933,
                this
                registration statement also covers an indeterminate amount of interests
                to
                be offered or sold pursuant to the employee benefit plan described
                herein.</font></div>
            </td>
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      </table>
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(3)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
                preferred share purchase rights are attached to and will trade with
                the
                common stock. The value attributable to the preferred share purchase
                rights, if any, is reflected in the market price of the common
                stock.</font></div>
            </td>
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      </table>
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    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(4)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Estimated
                solely for purposes of calculating the registration fee pursuant
                to Rule
                457(h) under the Securities Act of 1933 on the basis of the average
                of the
                high and low prices of the registrant&#8217;s common stock on the New York Stock
                Exchange composite tape on August 23,
                2006.</font></div>
            </td>
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      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(5)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Since
                no separate consideration is paid for the preferred share purchase
                rights,
                the registration fee for such securities is included in the fee for
                the
                common stock.</font></div>
            </td>
          </tr>

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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Part
      II. Information Required in the Registration Statement</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 45pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                3.&#160;&#160;&#160;</strong></font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Incorporation
                of Documents by Reference.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      following documents, previously filed with the Securities and Exchange
      Commission (&#8220;SEC&#8221;) by Ameren Corporation (the &#8220;Company&#8221;) and the Ameren
      Corporation Savings Investment Plan (the &#8220;Plan&#8221;) pursuant to the Securities
      Exchange Act of 1934, are incorporated by reference in this registration
      statement:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

            <tr valign="top" style="line-height: 1.25;">
              <td align="left" style="width: 54pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;</font></font>(a)</font></td>
              <td align="left">
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                  Company&#8217;s Annual Report on Form 10-K for the year ended December 31,
                  2005;</font></div>
              </td>
            </tr>

        </table>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 54pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;&#160;</font>(b)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                Company&#8217;s Quarterly Reports on Form 10-Q for the quarters ended March 31,
                2006 and June 30, 2006;</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 54pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;
              </font>(c)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                Company&#8217;s Current Reports on Form 8-K filed on January 13, 2006, February
                14, 2006 (excluding any portion of such report that was furnished),
                February 16, 2006, May 4, 2006 (excluding any portion of such report
                that
                was furnished), June 1, 2006, June 12, 2006, June 19, 2006, July
                7, 2006,
                July 18, 2006, and August 3, 2006 (excluding any portion of such
                report
                that was furnished);</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 54pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;&#160;</font>(d)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                description of the rights to purchase shares of the Company&#8217;s Series A
                junior participating preferred stock contained in the Company&#8217;s
                registration statement on Form 8-A dated November 23, 1998;
                and</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 54pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;&#160;</font>(e)</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                Annual Report on Form 11-K for the year ended December 31, 2005 of
                the
                Plan.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">All
      documents subsequently filed by the Company or the Plan pursuant to Sections
      13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (excluding
      any
      portions of any such documents that are furnished), prior to the filing of
      a
      post-effective amendment which indicates that all securities offered have been
      sold or which deregisters all the securities then remaining unsold, shall be
      deemed to be incorporated herein by reference and to be a part hereof from
      the
      date of filing of such documents. Any statement contained in an incorporated
      document shall be deemed to be modified or superseded to the extent that a
      statement contained herein or in any subsequently filed incorporated document
      modifies or supersedes such statement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 45pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                4.&#160;&#160;&#160;</strong></font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Description
                of Securities.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>General</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      following descriptions of the Company&#8217;s common stock and the relevant provisions
      of the Company&#8217;s restated articles of incorporation and By-laws are summaries
      and are qualified by reference to the Company&#8217;s restated articles of
      incorporation and By-laws which have been previously filed with the SEC and
      are
      exhibits to this registration statement as well as the applicable Missouri
      General and Business Corporation Law. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Under
      the
      Company&#8217;s restated articles of incorporation, the Company is authorized to issue
      400 million shares of common stock, $.01 par value per share, and 100 million
      shares of preferred stock, $.01 par value per share. At August 23, 2006,
      205,900,667 shares of common stock and no shares of preferred stock were
      outstanding.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Dividend
      Rights and Limitations</strong></font></div>
    <div>&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      holders of the Company&#8217;s common stock are entitled to receive such dividends as
      the Company&#8217;s board of directors may from time to time declare, subject to any
      rights of the holders of the Company&#8217;s preferred stock, if any is issued. The
      Company&#8217;s ability to pay dividends depends primarily upon the ability of the
      Company&#8217;s subsidiaries to pay dividends or otherwise transfer funds to the
      Company. Various financing arrangements, charter provisions and regulatory
      requirements may impose certain restrictions on the ability of the Company&#8217;s
      subsidiaries to transfer funds to the Company in the form of cash dividends,
      loans or advances. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
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        </div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-1</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
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      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Voting
      Rights</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Except
      as
      otherwise provided by law and subject to the voting rights of holders of the
      Company&#8217;s preferred stock, the holders of the Company&#8217;s common stock have the
      exclusive right to vote for the election of directors and for all other
      purposes. Each holder of the Company&#8217;s common stock is entitled to one vote per
      share on all matters submitted to a vote at a meeting of shareholders, including
      the election of directors, which means that the holders of more than 50% of
      the
      shares voting for the election of directors can elect 100% of the directors
      and
      the holders of the remaining shares voting for the election of directors will
      not be able to elect any directors. The common stock shall vote together as
      a
      single class. The holders of the Company&#8217;s common stock are not entitled to
      cumulate votes for the election of directors. At annual and special meetings
      of
      shareholders, a majority of the outstanding shares of common stock constitutes
      a
      quorum.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Liquidation
      Rights</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      the
      event of any liquidation, dissolution or winding up of the Company&#8217;s affairs,
      voluntarily or involuntarily, the holders of the Company&#8217;s common stock will be
      entitled to receive the remainder, if any, of the Company&#8217;s assets after the
      payment of all the Company&#8217;s debts and liabilities and after the payment in full
      of any preferential amounts to which holders of any preferred stock may be
      entitled.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Miscellaneous</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      outstanding shares of common stock are, and the shares of common stock sold
      hereunder will be, upon payment for them, fully paid and nonassessable. The
      holders of the Company&#8217;s common stock are not entitled to any preemptive or
      preferential rights to subscribe for or purchase any part of any new or
      additional issue of stock or securities convertible into stock. The Company&#8217;s
      common stock does not contain any redemption provisions or conversion rights.
      </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Transfer
      Agent and Registrar</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
      Services Company acts as transfer agent and registrar for the common
      stock.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Shareholder
      Rights Plan</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      October 9, 1998, the Company&#8217;s board of directors adopted a shareholder rights
      plan and declared a dividend of one preferred share purchase right for each
      outstanding share of the Company&#8217;s common stock. The plan is designed to assure
      shareholders fair and equal treatment in the event of a proposed takeover.
      Each
      right entitles the registered holder to purchase from the Company one
      one-hundredth of a share of Series A junior participating preferred stock,
      par
      value $.01 per share, at an exercise price of $180 per one one-hundredth of
      a
      share of such preferred stock, subject to adjustment. The rights will become
      exercisable only if a person or group acquires 15% or more of the Company&#8217;s
      common stock or announces a tender offer, the consummation of which would result
      in ownership by a person or group of 15% or more of the Company&#8217;s common stock.
      If a person or group acquires 15% or more of the Company&#8217;s outstanding common
      stock, each right will entitle its holder (other than such person or members
      of
      such group) to purchase, at the right&#8217;s then-current exercise price, a number of
      shares of the Company&#8217;s common stock having a market value of twice such price.
      In addition, if the Company is acquired in a merger or other business
      combination transaction after a person or group has acquired 15% or more of
      the
      Company&#8217;s outstanding common stock, each right will entitle its holder to
      purchase, at the right&#8217;s then-current exercise price, a number of shares of the
      acquiring company&#8217;s common stock having a market value of twice such price. The
      acquiring person or group will not be entitled to exercise these
      rights.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      rights were issued as a dividend payable January 8, 1999, to shareholders of
      record on that date. The rights will expire on October 9, 2008. One right will
      accompany each new share of the Company&#8217;s common stock issued prior to such
      expiration date. The rights do not have voting or dividend rights, and until
      they become exercisable, have no dilutive effect on the Company&#8217;s per-share
      earnings.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company has 4 million shares of preferred stock initially reserved for issuance
      upon exercise of the rights. There is no junior participating preferred stock
      issued or outstanding as of the date of the filing of this registration
      Statement. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      description and terms of the rights are set forth in an agreement between the
      Company and Computershare Trust Company, Inc. (formerly EquiServe Trust Company,
      N.A., as successor to First Chicago Trust Company of New York), as rights agent.
      The preceding summary of the rights and the shareholder rights plan is qualified
      in its entirety by reference to the rights agreement and the description thereof
      each contained in the Company&#8217;s registration statement on Form 8-A dated
      November 23, 1998, which is incorporated by reference.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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      Anti-Takeover Matters</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company&#8217;s restated articles of incorporation and By-laws include a number of
      provisions that may have the effect of discouraging persons from acquiring
      large
      blocks of the Company&#8217;s stock or delaying or preventing a change in the
      Company&#8217;s control. The material provisions that may have such an effect include:
</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 18pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">authorization
                for the Company&#8217;s board of directors (subject to any required regulatory
                approval) to issue the Company&#8217;s preferred stock in series and to fix
                rights and preferences of the series (including, among other things,
                whether, and to what extent, the shares of any series will have voting
                rights and the extent of the preferences of the shares of any series
                with
                respect to dividends and other
                matters);</font></div>
            </td>
          </tr>

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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 18pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">advance
                notice procedures with respect to nominations of directors or proposals
                other than those adopted or recommended by the Company&#8217;s board of
                directors;</font></div>
            </td>
          </tr>

      </table>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 18pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">the
                prohibition of shareholder action by less than unanimous written
                consent
                without a meeting; and</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 18pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">provisions
                specifying that only the chief executive officer or the board of
                directors
                (by a majority vote of the entire board of directors) may call special
                meetings of shareholders, and that the chairman of the meeting may
                adjourn
                a meeting of shareholders from time to time, whether or not a quorum
                is
                present.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      addition, the Missouri General and Business Corporation Law, or MGBCL, contains
      certain provisions, including business combination provisions that would be
      applicable to certain mergers, share exchanges or sales of substantially all
      assets involving the Company or a subsidiary and a significant shareholder
      and
      which could have the effect of substantially increasing the cost to the acquiror
      and thus discouraging any such transaction. The MGBCL permits shareholders
      to
      adopt an amendment to the articles of incorporation opting out of the business
      combination provisions, and the Company&#8217;s restated articles of incorporation opt
      out of such provisions. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Under
      the
      Illinois Public Utilities Act, approval of the Illinois Commerce Commission
      is
      required for any transaction which, regardless of the means by which it is
      accomplished, results in a change in the ownership of a majority of the voting
      capital stock of an Illinois public utility or the ownership or control of
      any
      entity which owns or controls a majority of the voting capital stock of a public
      utility. Because the Company controls a majority of the voting stock of Central
      Illinois Public Service Company, or AmerenCIPS, Central Illinois Light Company,
      or AmerenCILCO, and Illinois Power Company, or AmerenIP, each public utilities
      subject to Illinois utility regulation, any change in the Company&#8217;s ownership or
      control, within the meaning of the Illinois Public Utilities Act, would require
      Illinois Commerce Commission approval. Certain acquisitions of the Company&#8217;s
      outstanding voting shares may also require approval of the Federal Energy
      Regulatory Commission under the Federal Power Act.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 45pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                5.&#160;&#160;&#160;</strong></font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Interests
                of Named Experts and
                Counsel.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ronald
      K.
      Evans, Esq., Vice President and Deputy General Counsel of Ameren Services
      Company, a Missouri corporation and a subsidiary of the Company, will pass
      upon
      the validity of the offered securities. As of August 23, 2006, Mr. Evans owned
      4,837 shares of the Company&#8217;s common stock. In addition, as of that date,
      Mr.&#160;Evans owned 1,952 restricted shares of the Company&#8217;s common stock, none
      of which were vested, and has been awarded 1,816 performance share units under
      the Ameren Corporation Long-Term Incentive Plan of 1998, all of which are
      subject to meeting performance targets. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-3</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
      <div>&#160;</div>
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;">
              <div id="HDR"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                6.</strong></font></div>
            </td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Indemnification
                of Directors and Officers.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Article
      IV of the Company&#8217;s By-laws, consistent with the applicable provisions of the
      MGBCL, provides for indemnification of directors and officers. These provisions
      provide that any person shall be indemnified for expenses and liabilities
      imposed upon such person in connection with any threatened, pending or completed
      action, suit, or proceeding, whether civil, criminal, administrative or
      investigative, other than an action by or in the right of the Company, by reason
      of the fact that such person is or was a director, officer, employee or agent
      of
      the Company, or is or was serving at the request of the Company as a director,
      officer, employee or agent of another corporation, partnership, joint venture,
      trust or other enterprise, against expenses, including attorneys&#8217; fees,
      judgments, fines and amounts paid in settlement actually and reasonably incurred
      by such person in connection with such action, suit or proceeding if such person
      acted in good faith and in a manner such person reasonably believed to be in
      or
      not opposed to the best interests of the Company, and, with respect to any
      criminal action or proceeding, had no reasonable cause to believe his conduct
      was unlawful.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      a
      proceeding brought by or in the right of the Company, indemnification shall
      be
      made with respect to any claim as to which an officer or director has been
      adjudged to have been liable to the Company if such person acted in good faith
      and in a manner he reasonably believed to be in or not opposed to the best
      interests of the Company. However, no indemnification shall be made in respect
      of any claim, issue or matter as to which such person shall have been adjudged
      to be liable for negligence or misconduct in the performance of his duty to
      the
      Company unless and only to the extent that the court in which the action or
      suit
      was brought determines upon application that, despite the adjudication of
      liability and in view of all the circumstances of the case, the person is fairly
      and reasonably entitled to indemnity for such expenses which the court shall
      deem proper.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company&#8217;s By-laws, consistent with the applicable provisions of the MGBCL,
      provide that indemnification shall be made by the Company only if a
      determination has been made by a majority vote of a quorum of the disinterested
      directors or by the shareholders or by independent legal counsel, that the
      director or officer met the required standard of conduct. The Company has
      purchased insurance on behalf of its officers and directors which insures them
      against certain liabilities and expenses, including those that may arise under
      the Securities Act of 1933.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company&#8217;s By-laws, consistent with the applicable provisions of the MGBCL,
      further provide that, in addition to the indemnities described in the preceding
      paragraphs, the Company will further indemnify its officers and directors to
      the
      maximum extent permitted by law, provided that no indemnity may be given for
      conduct that is adjudged to be knowingly fraudulent, deliberately dishonest,
      or
      willful misconduct.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 45pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                8.&#160;&#160;&#160;</strong></font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Exhibits.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibit</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: -54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Number</u><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;
</font></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Description
      of Exhibit</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.1</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Restated
                Articles of Incorporation of the Company (File No. 33-64165, Annex
                F).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.2</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Certificate
                of Amendment to the Restated Articles of Incorporation filed with
                the
                Secretary of State of the State of Missouri on December 14, 1997
                (1998
                Form 10-K, Exhibit 3(i), File No.
                1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.3</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By-laws
                of the Company as amended effective August 28, 2005 (August 29, 2005
                Form
                8-K, Exhibit 3.2(ii), File No.
                1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.4</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Agreement,
                dated as of October 9, 1998, between the Company and Computershare
                Trust
                Company, Inc. (formerly EquiServe Trust Company, N.A., as successor
                to
                First Chicago Trust Company of New York), as Rights Agent, which
                includes
                the form of Certificate of Designation of the Preferred Shares as
                Exhibit&#160;A, the form of Rights Certificate as Exhibit B, and the
                Summary of Rights as Exhibit C (October 14, 1998 Form 8-K, Exhibit
                4, File
                No. 1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-4</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">5</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Opinion
                of Ronald K. Evans, Esq., Vice President and Deputy General Counsel
                of
                Ameren Services Company, a Missouri corporation and a subsidiary
                of the
                Company, regarding the legality of the
                securities.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.1</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Consent
                of Ronald K. Evans, Esq. (included in opinion, attached hereto as
                Exhibit
                5).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.2</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Consent
                of independent registered public accounting
                firm.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">24</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Power
                of Attorney.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">__________</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: -54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 9pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Incorporated
      herein by reference as indicated.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>UNDERTAKING:</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      The
      Company hereby undertakes that it has submitted the Plan and will submit any
      amendment thereto to the Internal Revenue Service in a timely manner and has
      made or will make all changes required by the Internal Revenue Service in order
      to qualify the plan.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 45pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
                9.&#160;&#160;&#160;</strong></font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Undertakings.</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;a.</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
                undersigned hereby undertakes:</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(1)</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
                file, during any period in which offers or sales are being made,
                a
                post-effective amendment to this registration
                statement:</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 54pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(i)
                </font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
                include any prospectus required by Section 10(a)(3) of the Securities
                Act
                of 1933;</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 54pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(ii)
                </font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
                reflect in the prospectus any facts or events arising after the effective
                date of the registration statement (or the most recent post-effective
                amendment thereof) which, individually or in the aggregate, represent
                a
                fundamental change in the information set forth in the registration
                statement. Notwithstanding the foregoing, any increase or decrease
                in
                volume of securities offered (if the total dollar value of securities
                offered would not exceed that which was registered) and any deviation
                from
                the low or high end of the estimated maximum offering range may be
                reflected in the form of prospectus filed with the SEC pursuant to
                Rule
                424(b) if, in the aggregate, the changes in volume and price represent
                no
                more than a 20 percent change in the maximum aggregate offering price
                set
                forth in the &#8220;Calculation of Registration Fee&#8221; table in the effective
                registration statement; and</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 54pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(iii)
                </font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
                include any material information with respect to the plan of distribution
                not previously disclosed in the registration statement or any material
                change to such information in the registration statement,
                </font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>provided,
      however</em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">,
      that
      paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required
      to
      be included in a post-effective amendment by those paragraphs is contained
      in
      periodic reports filed with or furnished to the SEC by the Company pursuant
      to
      Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
      incorporated by reference in the registration statement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(2)</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">That,
                for the purpose of determining any liability under the Securities
                Act of
                1933, each such post-effective amendment shall be deemed to be a
                new
                registration statement relating to the securities offered therein,
                and the
                offering of such securities at that time shall be deemed to be the
                initial
                bona fide offering thereof.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 18pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(3)</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
                remove from registration by means of a post-effective amendment any
                of the
                securities being registered which remain unsold at the termination
                of the
                offering.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-5</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div>&#160;</div>
    <div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.3; MARGIN-RIGHT: 0pt" align="left">
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;b.</font></td>
                <td align="left">
                  <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">That,
                    for purposes of determining any liability under the Securities
                    Act of
                    1933, each filing of the Company&#8217;s annual report pursuant to Section 13(a)
                    or Section 15(d) of the Securities Exchange Act of 1934 and each
                    filing of
                    the Plan&#8217;s annual report pursuant to Section 15(d) of the Securities Act
                    of 1933 that is incorporated by reference in the registration
                    statement
                    shall be deemed to be a new registration statement relating to
                    the
                    securities offered herein, and the offering of such securities
                    at that
                    time shall be deemed to be the initial bona fide offering
                    thereof.</font></div>
                </td>
              </tr>

          </table>
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.3; MARGIN-RIGHT: 0pt" align="left">
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;c.</font></td>
                <td align="left">
                  <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Insofaras
                    indemnification for liabilities arising under the Securities
                    Act of 1933
                    may be permitted to directors, officers and controlling persons
                    of the
                    Company pursuant to the provisions described under Item&#160;6 above, or
                    otherwise, the Company has been advised that in the opinion of
                    the SEC
                    such indemnification is against public policy as expressed in
                    the
                    Securities Act of 1933 and is, therefore, unenforceable. In the
                    event that
                    a claim for indemnification against such liabilities (other than
                    the
                    payment by the Company of expenses incurred or paid by a director,
                    officer
                    or controlling person of the Company in the successful defense
                    of any
                    action, suit or proceeding) is asserted by such director, officer
                    or
                    controlling person in connection with the securities being registered,
                    the
                    Company will, unless in the opinion of its counsel the matter
                    has been
                    settled by controlling precedent, submit to a court of appropriate
                    jurisdiction the question whether such indemnification by it
                    is against
                    public policy as expressed in the Securities Act of 1933 and
                    will be
                    governed by the final adjudication of such
                    issue.</font></div>
                </td>
              </tr>

          </table>
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-6</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SIGNATURES</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>The
      Registrant.</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      Pursuant
      to the requirements of the Securities Act of 1933, the registrant certifies
      that
      it has reasonable grounds to believe that it meets all of the requirements
      for
      filing on Form S-8 and has duly caused this registration statement to be signed
      on its behalf by the undersigned, thereunto duly authorized, in the City of
      St.&#160;Louis, State of Missouri, on the 29th day of August, 2006.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="justify" valign="top" width="38%">&#160;</td>
            <td align="left" colspan="5" valign="top" width="42%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>AMEREN
                CORPORATION (Registrant)</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" valign="top" width="38%" style="border-bottom: #ffffff solid;">&#160;</td>
            <td align="left" valign="bottom" width="1%" style="border-bottom: #ffffff solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:
                </font></div>
            </td>
            <td align="left" valign="bottom" width="1%" style="border-bottom: #ffffff solid;">
            </td>
            <td align="left" colspan="3" valign="bottom" width="40%" style="border-bottom: black thin solid;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
              Gary L. Rainwater</font></td>
          </tr>
          <tr>
            <td align="justify" rowspan="2" valign="top" width="38%">&#160;</td>
            <td align="left" colspan="5" valign="bottom" width="42%">&#160;&#160;&#160;&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Gary
              L. Rainwater</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="5" valign="bottom" width="44%">&#160;&#160;&#160;&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Chairman,
              Chief Executive Officer and President</font></td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 4.5pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Act of 1933, this registration statement
      has been signed by the following persons in the capacities and on the dates
      indicated.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Signature</u></strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Title</u></strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Date</u></strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">
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<font size="2">Chairman,
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<font size="2">August
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          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
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            <td align="left" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Officer
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
              <font size="2">/s/ Warner L. Baxter</font></td>
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<font size="2">Executive
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<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Warner L. Baxter</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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            <td align="left" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Chief
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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<font size="2">Vice
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            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;
                Martin J. Lyons</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="left" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Principal
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;<font size="2">*</font></div>
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            <td align="left" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
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<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 27pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Susan
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">&#160;</td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Gayle P.W. Jackson</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;&#160;<font size="2">*</font></div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                James C. Johnson</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;<font size="2">*</font></div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Richard A. Liddy</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">&#160;</td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Gordon R. Lohman</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;<font size="2">*</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 76.5pt">&#160;</font></div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="2" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Richard A. Lumpkin</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>

      </table>
    </div>
    <div>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-7</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div>&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="justify" colspan="4" valign="top" width="34%">
              <div>&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Signature</u></strong></font></div>
              <div><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font></div>
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          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 76.5pt">&#160;</font></div>
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            <td align="justify" valign="top" width="25%">&#160; <font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font size="2">August
                29, 2006</font></div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Charles
              W. Mueller</font></td>
            <td align="justify" valign="top" width="25%">&#160;&#160; </td>
            <td align="justify" valign="top" width="19%">
              <div>&#160;&#160; </div>
              <div>&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 76.5pt">&#160;</font></div>
            </td>
            <td align="justify" valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Director</font></div>
            </td>
            <td align="justify" valign="top" width="19%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font size="2">August
                29, 2006</font></div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%">
              <div>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Douglas
                R. Oberhelman</font></div>
              <div>&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%">&#160;</td>
            <td align="justify" valign="top" width="19%">&#160;&#160; </td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div>&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Harvey Saligman</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: black thin solid;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*</font></div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;
&#160;<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;&#160;
<font size="2">August
              29, 2006</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Patrick T. Stokes</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%" style="border-bottom: black thin solid;">&#160;</td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;
&#160;<font size="2">Director</font></td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;</td>
          </tr>
          <tr>
            <td align="justify" colspan="4" valign="top" width="34%">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Jack D. Woodard</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="19%">&#160;</td>
          </tr>
          <tr>
            <td align="justify" valign="top" width="4%" style="border-bottom: #ffffff solid;">&#160;
<font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*
              By: </font></td>
            <td align="justify" colspan="3" valign="top" width="30%" style="border-bottom: black thin solid;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
              /s/ Warner L. Baxter</font></td>
            <td align="justify" valign="top" width="25%" style="border-bottom: #ffffff solid;">&#160;</td>
            <td align="justify" valign="top" width="19%" style="border-bottom: #ffffff solid;">&#160;</td>
          </tr>
          <tr>
            <td align="left" colspan="4" valign="top" width="34%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Warner
                L. Baxter</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Attorney-in-Fact</em></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
            <td align="justify" valign="top" width="25%" style="border-bottom: medium none;">&#160;</td>
            <td align="justify" valign="top" width="19%" style="border-bottom: medium none;">&#160;</td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-8</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
      <div>&#160;</div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 18pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>The
      Plan</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">.
      Pursuant to the requirements of the Securities Act of 1933, the person who
      administers the undersigned employee benefit plan has duly caused this
      Registration Statement to be signed on its behalf by the undersigned thereunto
      duly authorized, in the City of St. Louis and State of Missouri, on the 29th
      day
      of August, 2006.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div align="right">
      <table cellpadding="0" cellspacing="0" width="75%">

          <tr>
            <td align="justify" valign="top" width="32%">&#160;</td>
            <td align="left" colspan="5" valign="top" width="47%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>AMEREN
                CORPORATION SAVINGS INVESTMENT PLAN</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>By:
                AMEREN SERVICES COMPANY (Administrator)</strong></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
          </tr>
          <tr>
            <td align="justify" valign="top" width="32%" style="border-bottom: #ffffff solid;">&#160;</td>
            <td align="left" valign="bottom" width="6%" style="border-bottom: #ffffff solid;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:</font></div>
            </td>
            <td align="left" colspan="4" valign="bottom" width="41%" style="border-bottom: black thin solid;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
              Jerre E. Birdsong</font></td>
          </tr>
          <tr>
            <td align="justify" rowspan="2" valign="top" width="32%">&#160;</td>
            <td align="left" colspan="5" valign="bottom" width="47%">&#160;&#160;&#160;&#160;&#160;&#160;&#160; &#160;<font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Jerre
              E. Birdsong</font></td>
          </tr>
          <tr>
            <td align="justify" colspan="5" valign="bottom" width="79%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
              President and Treasurer</font></td>
          </tr>
          <tr>
            <td align="justify" valign="top" width="32%">&#160;</td>
            <td align="justify" colspan="4" valign="bottom" width="47%">&#160;</td>
            <td align="justify" valign="bottom" width="41%">&#160;</td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: ">II-9</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>EXHIBIT
      INDEX</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.1</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Restated
                Articles of Incorporation of the Company (File No. 33-64165, Annex
                F).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.2</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Certificate
                of Amendment to the Restated Articles of Incorporation filed with
                the
                Secretary of State of the State of Missouri on December 14, 1997
                (1998
                Form 10-K, Exhibit 3(i), File No.
                1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.3</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By-laws
                of the Company as amended effective August 28, 2005 (August 29, 2005
                Form
                8-K, Exhibit 3.2(ii), File No.
                1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*4.4</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Agreement,
                dated as of October 9, 1998, between the Company and Computershare
                Trust
                Company, Inc. (formerly EquiServe Trust Company, N.A., as successor
                to
                First Chicago Trust Company of New York), as Rights Agent, which
                includes
                the form of Certificate of Designation of the Preferred Shares as
                Exhibit
                A, the form of Rights Certificate as Exhibit B, and the Summary of
                Rights
                as Exhibit C (October 14, 1998 Form 8-K, Exhibit 4, File No.
                1-14756).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">5</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exh_5.htm">Opinion
                of Ronald K. Evans, Esq., Vice President and
                Deputy General Counsel of Ameren Services Company, a Missouri corporation
                and a subsidiary of the Company, regarding the legality of the
                securities</a>.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

            <tr valign="top" style="line-height: 1.25;">
              <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.1</font></td>
              <td align="left">
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Consent
                  of Ronald K. Evans, Esq. (included in opinion, attached hereto
                  as Exhibit
                  5).</font></div>
              </td>
            </tr>

        </table>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">23.2</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exh23_2.htm">Consent
                of independent registered public accounting
                firm</a>.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 45pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">24</font></td>
            <td align="left">
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a href="exh_24.htm">Power
                of Attorney</a>.
</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">__________</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 54pt; TEXT-INDENT: -54pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 9pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Incorporated
      herein by reference as indicated.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right">&#160;</div>
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[{"type": "S-8", "sequence": "1", "filename": "forms8.htm", "description": "AMEREN CORPORATION FORM S-8", "secsgml_size_bytes": 143336}]
{"company-data": {"conformed-name": "AMEREN CORP", "cik": "0001002910", "assigned-sic": "4931", "irs-number": "431723446", "state-of-incorporation": "MO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-136971", "film-number": "061062726"}, "business-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166-6149", "phone": "314-621-3222"}, "mail-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63103"}}
Ameren Corporation Form S-8
As
      filed
      with the Securities and Exchange Commission on August 29, 2006
Registration
      No. 333-_____
SECURITIES
      AND EXCHANGE COMMISSION
Washington,
      D.C. 20549
____________________
FORM
      S-8
REGISTRATION
      STATEMENT
UNDER
THE
      SECURITIES ACT OF 1933
____________________
AMEREN
                CORPORATION
(Exact
                name of registrant as specified in its charter)
Missouri
(State
                or other jurisdiction of
incorporation
                or organization)
43-1723446
(I.R.S.
                Employer
Identification
                No.)
1901
      Chouteau Avenue
St.
      Louis, Missouri 63103
(314)
      621-3222
(Address,
      including zip code, and telephone number, including
area
      code, of registrant's principal executive offices)
____________________
Ameren
      Corporation Savings Investment Plan
(Full
      title of the plan)
WARNER
                L. BAXTER
Executive
                Vice President and Chief Financial Officer
STEVEN
                R. SULLIVAN
Senior
                Vice President, General Counsel and Secretary
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
(Names
      and address, including zip code, and telephone number,
including
      area code, of agents for service)
CALCULATION
      OF REGISTRATION FEE
Title
                of Each Class of Securities
to
                be Registered
Amount
                to be
Registered
                (1) (2) (3)
Proposed
                Maximum
Offering
                Price
Per
                Share (3)
Proposed
                Maximum
Aggregate
Offering
                Price (4)
Amount
                of
Registration
                Fee (5)
Common
                Stock, $.01 par value (including associated preferred share purchase
                rights)
3,000,000
                shares
$51.90
$155,700,000
$16,660
(1)
In
                addition, pursuant to Rule 416(a) under the Securities Act of 1933,
                this
                registration statement also covers such indeterminable number of
                additional securities as may become deliverable as a result of stock
                splits, stock dividends or similar transactions, in accordance with
                the
                provisions of the employee benefit plan described
                herein.
(2)
In
                addition, pursuant to Rule 416(c) under the Securities Act of 1933,
                this
                registration statement also covers an indeterminate amount of interests
                to
                be offered or sold pursuant to the employee benefit plan described
                herein.
(3)
The
                preferred share purchase rights are attached to and will trade with
                the
                common stock. The value attributable to the preferred share purchase
                rights, if any, is reflected in the market price of the common
                stock.
(4)
Estimated
                solely for purposes of calculating the registration fee pursuant
                to Rule
                457(h) under the Securities Act of 1933 on the basis of the average
                of the
                high and low prices of the registrant's common stock on the New York Stock
                Exchange composite tape on August 23,
                2006.
(5)
Since
                no separate consideration is paid for the preferred share purchase
                rights,
                the registration fee for such securities is included in the fee for
                the
                common stock.
Part
      II. Information Required in the Registration Statement
Item
                3.
Incorporation
                of Documents by Reference.
The
      following documents, previously filed with the Securities and Exchange
      Commission ("SEC") by Ameren Corporation (the "Company") and the Ameren
      Corporation Savings Investment Plan (the "Plan") pursuant to the Securities
      Exchange Act of 1934, are incorporated by reference in this registration
      statement:
(a)
the
                  Company's Annual Report on Form 10-K for the year ended December 31,
                  2005;
(b)
the
                Company's Quarterly Reports on Form 10-Q for the quarters ended March 31,
                2006 and June 30, 2006;
(c)
the
                Company's Current Reports on Form 8-K filed on January 13, 2006, February
                14, 2006 (excluding any portion of such report that was furnished),
                February 16, 2006, May 4, 2006 (excluding any portion of such report
                that
                was furnished), June 1, 2006, June 12, 2006, June 19, 2006, July
                7, 2006,
                July 18, 2006, and August 3, 2006 (excluding any portion of such
                report
                that was furnished);
(d)
the
                description of the rights to purchase shares of the Company's Series A
                junior participating preferred stock contained in the Company's
                registration statement on Form 8-A dated November 23, 1998;
                and
(e)
the
                Annual Report on Form 11-K for the year ended December 31, 2005 of
                the
                Plan.
All
      documents subsequently filed by the Company or the Plan pursuant to Sections
      13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (excluding
      any
      portions of any such documents that are furnished), prior to the filing of
      a
      post-effective amendment which indicates that all securities offered have been
      sold or which deregisters all the securities then remaining unsold, shall be
      deemed to be incorporated herein by reference and to be a part hereof from
      the
      date of filing of such documents. Any statement contained in an incorporated
      document shall be deemed to be modified or superseded to the extent that a
      statement contained herein or in any subsequently filed incorporated document
      modifies or supersedes such statement.
Item
                4.
Description
                of Securities.
General
The
      following descriptions of the Company's common stock and the relevant provisions
      of the Company's restated articles of incorporation and By-laws are summaries
      and are qualified by reference to the Company's restated articles of
      incorporation and By-laws which have been previously filed with the SEC and
      are
      exhibits to this registration statement as well as the applicable Missouri
      General and Business Corporation Law.
Under
      the
      Company's restated articles of incorporation, the Company is authorized to issue
      400 million shares of common stock, $.01 par value per share, and 100 million
      shares of preferred stock, $.01 par value per share. At August 23, 2006,
      205,900,667 shares of common stock and no shares of preferred stock were
      outstanding.
Dividend
      Rights and Limitations
The
      holders of the Company's common stock are entitled to receive such dividends as
      the Company's board of directors may from time to time declare, subject to any
      rights of the holders of the Company's preferred stock, if any is issued. The
      Company's ability to pay dividends depends primarily upon the ability of the
      Company's subsidiaries to pay dividends or otherwise transfer funds to the
      Company. Various financing arrangements, charter provisions and regulatory
      requirements may impose certain restrictions on the ability of the Company's
      subsidiaries to transfer funds to the Company in the form of cash dividends,
      loans or advances.
II-1
Voting
      Rights
Except
      as
      otherwise provided by law and subject to the voting rights of holders of the
      Company's preferred stock, the holders of the Company's common stock have the
      exclusive right to vote for the election of directors and for all other
      purposes. Each holder of the Company's common stock is entitled to one vote per
      share on all matters submitted to a vote at a meeting of shareholders, including
      the election of directors, which means that the holders of more than 50% of
      the
      shares voting for the election of directors can elect 100% of the directors
      and
      the holders of the remaining shares voting for the election of directors will
      not be able to elect any directors. The common stock shall vote together as
      a
      single class. The holders of the Company's common stock are not entitled to
      cumulate votes for the election of directors. At annual and special meetings
      of
      shareholders, a majority of the outstanding shares of common stock constitutes
      a
      quorum.
Liquidation
      Rights
In
      the
      event of any liquidation, dissolution or winding up of the Company's affairs,
      voluntarily or involuntarily, the holders of the Company's common stock will be
      entitled to receive the remainder, if any, of the Company's assets after the
      payment of all the Company's debts and liabilities and after the payment in full
      of any preferential amounts to which holders of any preferred stock may be
      entitled.
Miscellaneous
The
      outstanding shares of common stock are, and the shares of common stock sold
      hereunder will be, upon payment for them, fully paid and nonassessable. The
      holders of the Company's common stock are not entitled to any preemptive or
      preferential rights to subscribe for or purchase any part of any new or
      additional issue of stock or securities convertible into stock. The Company's
      common stock does not contain any redemption provisions or conversion rights.
Transfer
      Agent and Registrar
Ameren
      Services Company acts as transfer agent and registrar for the common
      stock.
Shareholder
      Rights Plan
On
      October 9, 1998, the Company's board of directors adopted a shareholder rights
      plan and declared a dividend of one preferred share purchase right for each
      outstanding share of the Company's common stock. The plan is designed to assure
      shareholders fair and equal treatment in the event of a proposed takeover.
      Each
      right entitles the registered holder to purchase from the Company one
      one-hundredth of a share of Series A junior participating preferred stock,
      par
      value $.01 per share, at an exercise price of $180 per one one-hundredth of
      a
      share of such preferred stock, subject to adjustment. The rights will become
      exercisable only if a person or group acquires 15% or more of the Company's
      common stock or announces a tender offer, the consummation of which would result
      in ownership by a person or group of 15% or more of the Company's common stock.
      If a person or group acquires 15% or more of the Company's outstanding common
      stock, each right will entitle its holder (other than such person or members
      of
      such group) to purchase, at the right's then-current exercise price, a number of
      shares of the Company's common stock having a market value of twice such price.
      In addition, if the Company is acquired in a merger or other business
      combination transaction after a person or group has acquired 15% or more of
      the
      Company's outstanding common stock, each right will entitle its holder to
      purchase, at the right's then-current exercise price, a number of shares of the
      acquiring company's common stock having a market value of twice such price. The
      acquiring person or group will not be entitled to exercise these
      rights.
The
      rights were issued as a dividend payable January 8, 1999, to shareholders of
      record on that date. The rights will expire on October 9, 2008. One right will
      accompany each new share of the Company's common stock issued prior to such
      expiration date. The rights do not have voting or dividend rights, and until
      they become exercisable, have no dilutive effect on the Company's per-share
      earnings.
II-2
The
      Company has 4 million shares of preferred stock initially reserved for issuance
      upon exercise of the rights. There is no junior participating preferred stock
      issued or outstanding as of the date of the filing of this registration
      Statement.
The
      description and terms of the rights are set forth in an agreement between the
      Company and Computershare Trust Company, Inc. (formerly EquiServe Trust Company,
      N.A., as successor to First Chicago Trust Company of New York), as rights agent.
      The preceding summary of the rights and the shareholder rights plan is qualified
      in its entirety by reference to the rights agreement and the description thereof
      each contained in the Company's registration statement on Form 8-A dated
      November 23, 1998, which is incorporated by reference.
Certain
      Anti-Takeover Matters
The
      Company's restated articles of incorporation and By-laws include a number of
      provisions that may have the effect of discouraging persons from acquiring
      large
      blocks of the Company's stock or delaying or preventing a change in the
      Company's control. The material provisions that may have such an effect include:
·
authorization
                for the Company's board of directors (subject to any required regulatory
                approval) to issue the Company's preferred stock in series and to fix
                rights and preferences of the series (including, among other things,
                whether, and to what extent, the shares of any series will have voting
                rights and the extent of the preferences of the shares of any series
                with
                respect to dividends and other
                matters);
·
advance
                notice procedures with respect to nominations of directors or proposals
                other than those adopted or recommended by the Company's board of
                directors;
·
the
                prohibition of shareholder action by less than unanimous written
                consent
                without a meeting; and
·
provisions
                specifying that only the chief executive officer or the board of
                directors
                (by a majority vote of the entire board of directors) may call special
                meetings of shareholders, and that the chairman of the meeting may
                adjourn
                a meeting of shareholders from time to time, whether or not a quorum
                is
                present.
In
      addition, the Missouri General and Business Corporation Law, or MGBCL, contains
      certain provisions, including business combination provisions that would be
      applicable to certain mergers, share exchanges or sales of substantially all
      assets involving the Company or a subsidiary and a significant shareholder
      and
      which could have the effect of substantially increasing the cost to the acquiror
      and thus discouraging any such transaction. The MGBCL permits shareholders
      to
      adopt an amendment to the articles of incorporation opting out of the business
      combination provisions, and the Company's restated articles of incorporation opt
      out of such provisions.
Under
      the
      Illinois Public Utilities Act, approval of the Illinois Commerce Commission
      is
      required for any transaction which, regardless of the means by which it is
      accomplished, results in a change in the ownership of a majority of the voting
      capital stock of an Illinois public utility or the ownership or control of
      any
      entity which owns or controls a majority of the voting capital stock of a public
      utility. Because the Company controls a majority of the voting stock of Central
      Illinois Public Service Company, or AmerenCIPS, Central Illinois Light Company,
      or AmerenCILCO, and Illinois Power Company, or AmerenIP, each public utilities
      subject to Illinois utility regulation, any change in the Company's ownership or
      control, within the meaning of the Illinois Public Utilities Act, would require
      Illinois Commerce Commission approval. Certain acquisitions of the Company's
      outstanding voting shares may also require approval of the Federal Energy
      Regulatory Commission under the Federal Power Act.
Item
                5.
Interests
                of Named Experts and
                Counsel.
Ronald
      K.
      Evans, Esq., Vice President and Deputy General Counsel of Ameren Services
      Company, a Missouri corporation and a subsidiary of the Company, will pass
      upon
      the validity of the offered securities. As of August 23, 2006, Mr. Evans owned
      4,837 shares of the Company's common stock. In addition, as of that date,
      Mr. Evans owned 1,952 restricted shares of the Company's common stock, none
      of which were vested, and has been awarded 1,816 performance share units under
      the Ameren Corporation Long-Term Incentive Plan of 1998, all of which are
      subject to meeting performance targets.
II-3
Item
                6.
Indemnification
                of Directors and Officers.
Article
      IV of the Company's By-laws, consistent with the applicable provisions of the
      MGBCL, provides for indemnification of directors and officers. These provisions
      provide that any person shall be indemnified for expenses and liabilities
      imposed upon such person in connection with any threatened, pending or completed
      action, suit, or proceeding, whether civil, criminal, administrative or
      investigative, other than an action by or in the right of the Company, by reason
      of the fact that such person is or was a director, officer, employee or agent
      of
      the Company, or is or was serving at the request of the Company as a director,
      officer, employee or agent of another corporation, partnership, joint venture,
      trust or other enterprise, against expenses, including attorneys' fees,
      judgments, fines and amounts paid in settlement actually and reasonably incurred
      by such person in connection with such action, suit or proceeding if such person
      acted in good faith and in a manner such person reasonably believed to be in
      or
      not opposed to the best interests of the Company, and, with respect to any
      criminal action or proceeding, had no reasonable cause to believe his conduct
      was unlawful.
In
      a
      proceeding brought by or in the right of the Company, indemnification shall
      be
      made with respect to any claim as to which an officer or director has been
      adjudged to have been liable to the Company if such person acted in good faith
      and in a manner he reasonably believed to be in or not opposed to the best
      interests of the Company. However, no indemnification shall be made in respect
      of any claim, issue or matter as to which such person shall have been adjudged
      to be liable for negligence or misconduct in the performance of his duty to
      the
      Company unless and only to the extent that the court in which the action or
      suit
      was brought determines upon application that, despite the adjudication of
      liability and in view of all the circumstances of the case, the person is fairly
      and reasonably entitled to indemnity for such expenses which the court shall
      deem proper.
The
      Company's By-laws, consistent with the applicable provisions of the MGBCL,
      provide that indemnification shall be made by the Company only if a
      determination has been made by a majority vote of a quorum of the disinterested
      directors or by the shareholders or by independent legal counsel, that the
      director or officer met the required standard of conduct. The Company has
      purchased insurance on behalf of its officers and directors which insures them
      against certain liabilities and expenses, including those that may arise under
      the Securities Act of 1933.
The
      Company's By-laws, consistent with the applicable provisions of the MGBCL,
      further provide that, in addition to the indemnities described in the preceding
      paragraphs, the Company will further indemnify its officers and directors to
      the
      maximum extent permitted by law, provided that no indemnity may be given for
      conduct that is adjudged to be knowingly fraudulent, deliberately dishonest,
      or
      willful misconduct.
Item
                8.
Exhibits.
Exhibit
Number
Description
      of Exhibit
*4.1
Restated
                Articles of Incorporation of the Company (File No. 33-64165, Annex
                F).
*4.2
Certificate
                of Amendment to the Restated Articles of Incorporation filed with
                the
                Secretary of State of the State of Missouri on December 14, 1997
                (1998
                Form 10-K, Exhibit 3(i), File No.
                1-14756).
*4.3
By-laws
                of the Company as amended effective August 28, 2005 (August 29, 2005
                Form
                8-K, Exhibit 3.2(ii), File No.
                1-14756).
*4.4
Agreement,
                dated as of October 9, 1998, between the Company and Computershare
                Trust
                Company, Inc. (formerly EquiServe Trust Company, N.A., as successor
                to
                First Chicago Trust Company of New York), as Rights Agent, which
                includes
                the form of Certificate of Designation of the Preferred Shares as
                Exhibit A, the form of Rights Certificate as Exhibit B, and the
                Summary of Rights as Exhibit C (October 14, 1998 Form 8-K, Exhibit
                4, File
                No. 1-14756).
II-4
5
Opinion
                of Ronald K. Evans, Esq., Vice President and Deputy General Counsel
                of
                Ameren Services Company, a Missouri corporation and a subsidiary
                of the
                Company, regarding the legality of the
                securities.
23.1
Consent
                of Ronald K. Evans, Esq. (included in opinion, attached hereto as
                Exhibit
                5).
23.2
Consent
                of independent registered public accounting
                firm.
24
Power
                of Attorney.
__________
*
Incorporated
      herein by reference as indicated.
UNDERTAKING:
The
      Company hereby undertakes that it has submitted the Plan and will submit any
      amendment thereto to the Internal Revenue Service in a timely manner and has
      made or will make all changes required by the Internal Revenue Service in order
      to qualify the plan.
Item
                9.
Undertakings.
a.
The
                undersigned hereby undertakes:
(1)
To
                file, during any period in which offers or sales are being made,
                a
                post-effective amendment to this registration
                statement:
(i)
To
                include any prospectus required by Section 10(a)(3) of the Securities
                Act
                of 1933;
(ii)
To
                reflect in the prospectus any facts or events arising after the effective
                date of the registration statement (or the most recent post-effective
                amendment thereof) which, individually or in the aggregate, represent
                a
                fundamental change in the information set forth in the registration
                statement. Notwithstanding the foregoing, any increase or decrease
                in
                volume of securities offered (if the total dollar value of securities
                offered would not exceed that which was registered) and any deviation
                from
                the low or high end of the estimated maximum offering range may be
                reflected in the form of prospectus filed with the SEC pursuant to
                Rule
                424(b) if, in the aggregate, the changes in volume and price represent
                no
                more than a 20 percent change in the maximum aggregate offering price
                set
                forth in the "Calculation of Registration Fee" table in the effective
                registration statement; and
(iii)
To
                include any material information with respect to the plan of distribution
                not previously disclosed in the registration statement or any material
                change to such information in the registration statement,
provided,
      however
,
      that
      paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required
      to
      be included in a post-effective amendment by those paragraphs is contained
      in
      periodic reports filed with or furnished to the SEC by the Company pursuant
      to
      Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
      incorporated by reference in the registration statement.
(2)
That,
                for the purpose of determining any liability under the Securities
                Act of
                1933, each such post-effective amendment shall be deemed to be a
                new
                registration statement relating to the securities offered therein,
                and the
                offering of such securities at that time shall be deemed to be the
                initial
                bona fide offering thereof.
(3)
To
                remove from registration by means of a post-effective amendment any
                of the
                securities being registered which remain unsold at the termination
                of the
                offering.
II-5
b.
That,
                    for purposes of determining any liability under the Securities
                    Act of
                    1933, each filing of the Company's annual report pursuant to Section 13(a)
                    or Section 15(d) of the Securities Exchange Act of 1934 and each
                    filing of
                    the Plan's annual report pursuant to Section 15(d) of the Securities Act
                    of 1933 that is incorporated by reference in the registration
                    statement
                    shall be deemed to be a new registration statement relating to
                    the
                    securities offered herein, and the offering of such securities
                    at that
                    time shall be deemed to be the initial bona fide offering
                    thereof.
c.
Insofaras
                    indemnification for liabilities arising under the Securities
                    Act of 1933
                    may be permitted to directors, officers and controlling persons
                    of the
                    Company pursuant to the provisions described under Item 6 above, or
                    otherwise, the Company has been advised that in the opinion of
                    the SEC
                    such indemnification is against public policy as expressed in
                    the
                    Securities Act of 1933 and is, therefore, unenforceable. In the
                    event that
                    a claim for indemnification against such liabilities (other than
                    the
                    payment by the Company of expenses incurred or paid by a director,
                    officer
                    or controlling person of the Company in the successful defense
                    of any
                    action, suit or proceeding) is asserted by such director, officer
                    or
                    controlling person in connection with the securities being registered,
                    the
                    Company will, unless in the opinion of its counsel the matter
                    has been
                    settled by controlling precedent, submit to a court of appropriate
                    jurisdiction the question whether such indemnification by it
                    is against
                    public policy as expressed in the Securities Act of 1933 and
                    will be
                    governed by the final adjudication of such
                    issue.
II-6
SIGNATURES
The
      Registrant.
Pursuant
      to the requirements of the Securities Act of 1933, the registrant certifies
      that
      it has reasonable grounds to believe that it meets all of the requirements
      for
      filing on Form S-8 and has duly caused this registration statement to be signed
      on its behalf by the undersigned, thereunto duly authorized, in the City of
      St. Louis, State of Missouri, on the 29th day of August, 2006.
AMEREN
                CORPORATION (Registrant)
By:
/s/
              Gary L. Rainwater
Gary
              L. Rainwater
Chairman,
              Chief Executive Officer and President
Pursuant
      to the requirements of the Securities Act of 1933, this registration statement
      has been signed by the following persons in the capacities and on the dates
      indicated.
Signature
Title
Date
/s/
                Gary L. Rainwater
Chairman,
              Chief Executive
August
              29, 2006
Gary
                L.
                Rainwater
Officer
and
                President
(Principal
                Executive Officer)
/s/ Warner L. Baxter
Executive
              Vice President
              and
August
              29, 2006
Warner L. Baxter
Chief
                Financial Officer
(Principal
                Financial Officer)
/s/ Martin J. Lyons
Vice
              President and
              Controller
August
              29, 2006
Martin J. Lyons
(Principal
                Accounting Officer)
*
Director
August
              29, 2006
Susan
                S. Elliott
Director
Gayle P.W. Jackson
*
Director
August
              29, 2006
James C. Johnson
*
Director
August
              29, 2006
Richard A. Liddy
Director
Gordon R. Lohman
*
Director
August
              29, 2006
Richard A. Lumpkin
II-7
Signature
Title
Date
*
Director
August
                29, 2006
Charles
              W. Mueller
*
Director
August
                29, 2006
Douglas
                R. Oberhelman
Director
Harvey Saligman
*
Director
August
              29, 2006
Patrick T. Stokes
Director
Jack D. Woodard
*
              By:
/s/ Warner L. Baxter
Warner
                L. Baxter
Attorney-in-Fact
II-8
The
      Plan
.
      Pursuant to the requirements of the Securities Act of 1933, the person who
      administers the undersigned employee benefit plan has duly caused this
      Registration Statement to be signed on its behalf by the undersigned thereunto
      duly authorized, in the City of St. Louis and State of Missouri, on the 29th
      day
      of August, 2006.
AMEREN
                CORPORATION SAVINGS INVESTMENT PLAN
By:
                AMEREN SERVICES COMPANY (Administrator)
By:
/s/
              Jerre E. Birdsong
Jerre
              E. Birdsong
Vice
              President and Treasurer
II-9
EXHIBIT
      INDEX
*4.1
Restated
                Articles of Incorporation of the Company (File No. 33-64165, Annex
                F).
*4.2
Certificate
                of Amendment to the Restated Articles of Incorporation filed with
                the
                Secretary of State of the State of Missouri on December 14, 1997
                (1998
                Form 10-K, Exhibit 3(i), File No.
                1-14756).
*4.3
By-laws
                of the Company as amended effective August 28, 2005 (August 29, 2005
                Form
                8-K, Exhibit 3.2(ii), File No.
                1-14756).
*4.4
Agreement,
                dated as of October 9, 1998, between the Company and Computershare
                Trust
                Company, Inc. (formerly EquiServe Trust Company, N.A., as successor
                to
                First Chicago Trust Company of New York), as Rights Agent, which
                includes
                the form of Certificate of Designation of the Preferred Shares as
                Exhibit
                A, the form of Rights Certificate as Exhibit B, and the Summary of
                Rights
                as Exhibit C (October 14, 1998 Form 8-K, Exhibit 4, File No.
                1-14756).
5
Opinion
                of Ronald K. Evans, Esq., Vice President and
                Deputy General Counsel of Ameren Services Company, a Missouri corporation
                and a subsidiary of the Company, regarding the legality of the
                securities
.
23.1
Consent
                  of Ronald K. Evans, Esq. (included in opinion, attached hereto
                  as Exhibit
                  5).
23.2
Consent
                of independent registered public accounting
                firm
.
24
Power
                of Attorney
.
__________
*
Incorporated
      herein by reference as indicated.