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D.C. 20549</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">FORM
      8-K</font></div>
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            <td valign="top" width="24%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-VARIANT: small-caps">Current
Report</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to Section 13 or 15(d) of the</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities
Exchange Act of 1934</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of
report (Date of earliest event reported):<a name="ReportDate" /></font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">March
      2, 2009</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><a name="Registrant"><br></a></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Commission File
      Number</font></font></div>
            </td>
            <td align="left" valign="top" width="32%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Exact
      Name of Registrant as</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Specified
      in Charter;</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">State
      of Incorporation;</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Address and Telephone
      Number</font></font></div>
              <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
            </td>
            <td align="left" valign="top" width="21%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">IRS
      Employer</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Identification
      Number</font></font></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="jurisdiction">1-14756</a></font></div>
            </td>
            <td align="left" valign="top" width="32%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="cfn">Ameren Corporation</a></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Missouri
      Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><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; MARGIN-RIGHT: 0pt" align="left"><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; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(314)
      621-3222</font></div>
              <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
            </td>
            <td align="left" valign="top" width="21%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="ein">43-1723446</a></font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a name="Address" /><a name="Zip">Check the appropriate box below if the Form 8-K filing
is intended to simultaneously satisfy the filing obligation of the registrant
under any of the following provisions:</a></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#160;]</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
            </td>
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      </table>
    </div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#160;]</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#160;]</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))</font></div>
            </td>
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      </table>
    </div>
    <div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#160;]</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))</font></div>
            </td>
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    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
      5.02</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Departure
      of Directors or Certain Officers; Election of Directors; Appointment of
      Certain Officers; Compensatory Arrangements of Certain
      Officers.</font></div>
            </td>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      March&#160;2, 2009, Gary L. Rainwater advised the Board of Directors
      (&#8220;Board&#8221;) of Ameren Corporation (&#8220;Ameren&#8221;) of his intention to relinquish
      his position as President and Chief Executive Officer of Ameren, effective
      May 1, 2009.&#160;&#160;Mr. Rainwater will continue to serve as a director
      and as Executive Chairman of the
company.</font></div>
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      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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            <td style="WIDTH: 36pt">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Also
      on March 2, 2009, the Board made the following officer appointments, which
      will be effective May 1, 2009:</font></div>
            </td>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Thomas
      R. Voss, 61, will become President and Chief Executive Officer of
      Ameren.&#160;&#160;Mr. Voss joined Union Electric Company (&#8220;UE&#8221;) in 1969
      as an engineer. He was elected senior vice president of UE, Central
      Illinois Public Service Company (&#8220;CIPS&#8221;), and Ameren Services Company
      (&#8220;Ameren Services&#8221;) in 1999, of Ameren Energy Generating Company (&#8220;Genco&#8221;)
      in 2001, of CILCORP Inc. (&#8220;CILCORP&#8221;) and Central Illinois Light Company
      (&#8220;CILCO&#8221;) in 2003, and of Illinois Power Company (&#8220;IP&#8221;) in
      2004.&#160;&#160;Each of UE, CIPS, Ameren Services, Genco, CILCORP, CILCO
      and IP is a subsidiary of Ameren.&#160;&#160;In 2003, Mr. Voss was elected
      president of Genco; he relinquished his presidency of this company in
      2004. He was elected executive vice president and chief operating officer
      of Ameren in 2005. In 2006, he was elected executive vice president of UE,
      CIPS, CILCORP, CILCO and IP. In 2007, Mr. Voss was elected chairman, chief
      executive officer, and president of UE. He relinquished his positions at
      CIPS, CILCORP, CILCO and IP in 2007, and will relinquish his positions at
      UE effective May 1, 2009.&#160;&#160;Upon Mr. Voss&#8217;s assumption of his new
      responsibilities, the position of chief operating officer of Ameren will
      be eliminated.</font></div>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Effective
      as of May 1, 2009, Mr. Voss&#8217;s base salary will be increased from $477,400
      to $750,000.&#160;&#160;In addition, the target cash bonus for which he is
      eligible under Ameren&#8217;s 2009 executive incentive plan (&#8220;EIP&#8221;), described
      in the Compensation Discussion &amp; Analysis section of Ameren&#8217;s
      definitive proxy statement for its 2008 annual meeting of shareholders
      filed with the Securities and Exchange Commission on March 6, 2008
      (&#8220;CD&amp;A&#8221;), has been increased, effective May 1, 2009, from 60% to 90%
      of his base salary.&#160;&#160;Mr. Voss&#8217;s actual bonus under this program
      may vary from target based on his performance, UE&#8217;s performance for the
      first four months of 2009 and Ameren&#8217;s performance in accordance with the
      formulas and methodologies employed in the EIP, which are described in the
      CD&amp;A.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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            <td style="WIDTH: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Warner
      L. Baxter, 47, will relinquish his position as Executive Vice President
      and Chief Financial Officer of Ameren to become President and Chief
      Executive Officer of UE. Effective as of May 1, 2009 with his change in
      position, Mr. Baxter&#8217;s base salary will be increased from $552,900 to
      $575,000.</font></div>
            </td>
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      </table>
    </div>
    <div>&#160;</div>
    <div>&#160;</div>
    <div>&#160;</div>
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              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Mr.
      Baxter will be succeeded by Martin J. Lyons, 42, who will become Chief
      Financial Officer of Ameren, while maintaining his current
      responsibilities as Senior Vice President and principal accounting
      officer.&#160;&#160;Mr. Lyons joined Ameren, UE, CIPS, Genco, and Ameren
      Services in 2001 as controller. He was elected controller of CILCORP and
      CILCO in 2003. He was also elected vice president of Ameren, UE, CIPS,
      Genco, CILCORP, CILCO, and Ameren Services in 2003 and vice president and
      controller of IP in 2004. In 2007, his position at UE was changed to vice
      president and principal accounting officer. In 2008, Mr. Lyons was elected
      senior vice president and chief accounting officer of the Ameren
      companies.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Effective
      as of May 1, 2009, Mr. Lyons&#8217;s base salary will be increased from $314,600
      to $390,000.&#160;&#160;In addition, the target cash bonus for which he is
      eligible under the EIP, described in the CD&amp;A, has been increased from
      50% to 60% of his base salary.&#160;&#160;Mr. Lyons&#8217;s actual bonus under
      this program may vary from target based on his performance and Ameren&#8217;s
      performance in accordance with the formulas and methodologies employed in
      the EIP, which are described in the
CD&amp;A.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(e)</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Effective
      as of May 1, 2009 with his change in position, Mr. Rainwater&#8217;s base salary
      will be decreased from $940,000 to $450,000.&#160;&#160;In addition, the
      target cash bonus for which he is eligible under the EIP, described in the
      CD&amp;A, has been decreased from 90% to 60% of his base
      salary.&#160;&#160;Mr. Rainwater&#8217;s actual bonus under this program may
      vary from target based on his performance and Ameren&#8217;s performance in
      accordance with the formulas and methodologies employed in the EIP, which
      are described in the CD&amp;A.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      addition, on March&#160;2, 2009, the Human Resources Committee of Ameren&#8217;s
      Board (the &#8220;Committee&#8221;) authorized the issuance pursuant to the 2006
      Omnibus Incentive Compensation Plan (the &#8220;Omnibus Plan&#8221;) of performance
      share unit awards for 2009 to the executive officers identified on the
      table attached as Exhibit&#160;99.1 (collectively, the &#8220;Executive
      Officers&#8221;).&#160;&#160;Each performance share unit represents the right to
      receive a share of Ameren&#8217;s common stock assuming certain performance
      criteria are achieved.&#160;&#160;The actual number of performance share
      units which may be earned will vary from 0&#160;percent to
      200&#160;percent of the target number of performance share units granted
      to each Executive Officer, based primarily on Ameren&#8217;s three-year total
      shareholder return (&#8220;TSR&#8221;) relative to a utility peer group and continued
      employment during such three-year period (the &#8220;Performance
      Period&#8221;).&#160;&#160;In the event Ameren&#8217;s TSR relative to utility peers
      during the Performance Period is below the 30th percentile, no performance
      share units will be earned unless Ameren&#8217;s earnings per share during each
      year of the Performance Period, as determined by the Committee for this
      purpose, equals or exceeds $2.54.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Dividends
on performance share units will accrue and be reinvested into additional
performance share units throughout the Performance Period.&#160;&#160;Because
these performance share units will be earned only if performance goals over the
Performance Period are attained, the amounts, if any, that will be payable to
the Executive Officers pursuant to the performance share unit awards described
above are not determinable at this time.&#160;&#160;The Committee has the
ability to amend the terms of the performance share unit awards, including the
performance criteria, to the extent not adverse to the holders of an
award.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; 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: 10pt; FONT-FAMILY: Times New Roman">-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>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The form
of performance share unit award for 2009 is attached as Exhibit&#160;10.1 and is
incorporated herein by reference.&#160;&#160;The target number of performance
share units issued to each Executive Officer for 2009 pursuant to the Omnibus
Plan is set forth in the table attached as Exhibit&#160;99.1 and is incorporated
by reference herein.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The award
agreements between Ameren and each of the Executive Officers provide that upon
the occurrence of a &#8220;Change of Control&#8221; if Ameren continues to exist and its
common stock is traded on the New York Stock Exchange (&#8220;NYSE&#8221;) or NASDAQ Stock
Market (&#8220;NASDAQ&#8221;) (i) voluntary terminations of employment prior to the end of
the performance period or terminations for &#8220;Cause&#8221; at any time prior to pay out
of shares result in forfeiture of awards and (ii) a &#8220;qualifying termination&#8221; (as
defined in the award agreement) of employment during the performance period does
not change the manner in which awards are earned and become vested on
December&#160;31, 2011 and such awards will be paid in shares of Ameren common
stock on January&#160;1, 2012 or as soon as practicable thereafter.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The award
agreements referenced above also provide that upon a &#8220;Change of Control&#8221; which
occurs on or before December&#160;31, 2011, if Ameren ceases to exist or its
common stock is no longer traded on the NYSE or NASDAQ, the Omnibus Plan will be
terminated and (i) the target number of performance share units together with
accrued dividends thereon will be converted into nonqualified deferred
compensation which will accrue interest at the prime rate as provided in the
award agreement and, assuming continued employment, such amount will vest and be
paid out on December&#160;31, 2011, (ii)&#160;voluntary terminations of
employment or terminations for &#8220;Cause&#8221; result in forfeiture of the amounts
described above in (i) of this paragraph and (iii) qualifying terminations of
employment result in an immediate payment of the amounts described above in (i)
of this paragraph (except as otherwise provided in the awards).</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The terms
&#8220;Change of Control&#8221; and &#8220;Cause&#8221; have the meanings given them in the Second
Amended and Restated Ameren Corporation Change of Control Severance Plan,
effective October 10, 2008 (the &#8220;Plan&#8221;), to be filed as an exhibit to Ameren&#8217;s
Annual Report on Form&#160;10-K for the 2008 fiscal year,<font style="DISPLAY: inline; FONT-STYLE: italic"> provided</font> that the terms
&#8220;Change of Control&#8221; and &#8220;Cause&#8221; are defined therein as they were defined in the
Amended and Restated Ameren Corporation Change of Control Severance Plan, a copy
of which was filed as Exhibit&#160;10.5 to Ameren&#8217;s Current Report filed on
Form&#160;8-K dated February&#160;16, 2006, and which has been replaced by the
Plan.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 72pt">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
      7.01</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Regulation
      FD Disclosure.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">A copy of
the press release announcing certain executive management changes at Ameren to
be effective May 1, 2009, as well as new nominees for election to Ameren&#8217;s
Board, is attached as Exhibit 99.2 and incorporated by reference
herein.&#160;&#160;The information furnished pursuant to this Item 7.01,
including Exhibit 99.2, shall not be deemed &#8220;filed&#8221; for purposes of
Section&#160;18 of the Securities Exchange Act of 1934 (the &#8220;Exchange Act&#8221;) or
otherwise subject to the liabilities under that Section and shall not be deemed
to be incorporated by reference into any filing of Ameren under the Securities
Act of 1933 or the Exchange Act.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; 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: 10pt; FONT-FAMILY: Times New Roman">-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>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 72pt">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
      9.01</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Financial
      Statements and Exhibits.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 36pt">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)</font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibits.</font></div>
              <div align="justify">&#160;</div>
            </td>
          </tr>
      </table>
    </div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">
          <tr>
            <td align="left" valign="top" width="18%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Exhibit
      Number:</font></div>
            </td>
            <td align="left" valign="top" width="61%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="18%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.1</font></div>
            </td>
            <td align="left" valign="top" width="61%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Form
      of Performance Share Unit for Award Issued in 2009 pursuant to
      </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">2006
      Omnibus Incentive Compensation Plan.</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="18%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.1</font></div>
            </td>
            <td align="left" valign="top" width="61%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Table
      of 2009 Target Performance Share Unit Awards Issued to </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Executive
      Officers.</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="18%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.2</font></div>
            </td>
            <td align="left" valign="top" width="61%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Press
      release, dated March 2, 2009, regarding certain executive </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">management
      changes at Ameren to be effective May 1, 2009, as well as </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">new
      nominees for election to Ameren&#8217;s board of
  directors.</font></div>
            </td>
          </tr>
      </table>
    </div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; 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: 10pt; FONT-FAMILY: Times New Roman">-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 style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 270pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-VARIANT: small-caps">Signatures</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to the requirements of the Securities Exchange Act of 1934, Ameren has duly
caused this report to be signed on its behalf by the undersigned thereunto duly
authorized.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 273pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-VARIANT: small-caps">Ameren
      Corporation</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div align="center">
      <table border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 273pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></div>
            </td>
            <td>
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Registrant)</font></div>
            </td>
          </tr>
          <tr valign="top">
            <td style="WIDTH: 273pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
          </tr>
          <tr valign="top">
            <td style="WIDTH: 273pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">By:
      &#160;<font style="TEXT-DECORATION: underline">/s/ Steven&#160;R.
      Sullivan&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
      </font></font></td>
          </tr>
      </table>
    </div>
    <div align="center">
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 274pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div style="TEXT-INDENT: 18pt; TEXT-ALIGN: left" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Steven
      R. Sullivan</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
          <tr valign="top">
            <td style="WIDTH: 274pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
            </td>
            <td>
              <div style="TEXT-INDENT: 18pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
      Vice President, General Counsel and </font></div>
              <div style="TEXT-INDENT: 18pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Secretary</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:&#160;&#160;March
2, 2009</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></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: 10pt; FONT-FAMILY: Times New Roman">-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; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman; FONT-VARIANT: small-caps">Exhibit
Index</font></div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">
          <tr>
            <td valign="top" width="22%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Exhibit
      Number:</font></div>
            </td>
            <td align="left" valign="top" width="56%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="22%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.1</font></div>
            </td>
            <td align="left" valign="top" width="56%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Form
      of Performance Share Unit for Award Issued in 2009 </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">pursuant
      to 2006 Omnibus Incentive Compensation Plan.</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="22%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.1</font></div>
            </td>
            <td align="left" valign="top" width="56%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Table
      of 2009 Target Performance Share Unit Awards Issued to </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Executive
      Officers.</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="22%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.2</font></div>
            </td>
            <td align="left" valign="top" width="56%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Press
      release, dated March 2, 2009, regarding certain executive </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">management
      changes </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">at
      Ameren to be </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">effective
      May 1, 2009, as </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">well
      as new nominees for election to Ameren&#8217;s board of
    directors.</font></div>
            </td>
          </tr>
      </table>
    </div><br></body>
</html>
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amerencorp8k030209.htm
UNITED
STATES
SECURITIES
AND EXCHANGE COMMISSION
Washington,
D.C. 20549
FORM
      8-K
Current
Report
Pursuant
to Section 13 or 15(d) of the
Securities
Exchange Act of 1934
Date of
report (Date of earliest event reported):
March
      2, 2009
Commission File
      Number
Exact
      Name of Registrant as
Specified
      in Charter;
State
      of Incorporation;
Address and Telephone
      Number
IRS
      Employer
Identification
      Number
1-14756
Ameren Corporation
(Missouri
      Corporation)
1901
      Chouteau Avenue
St.
      Louis, Missouri 63103
(314)
      621-3222
43-1723446
Check the appropriate box below if the Form 8-K filing
is intended to simultaneously satisfy the filing obligation of the registrant
under any of the following provisions:
[  ]
Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
[  ]
Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
[  ]
Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))
[  ]
Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))
Item
      5.02
Departure
      of Directors or Certain Officers; Election of Directors; Appointment of
      Certain Officers; Compensatory Arrangements of Certain
      Officers.
(b)
On
      March 2, 2009, Gary L. Rainwater advised the Board of Directors
      ("Board") of Ameren Corporation ("Ameren") of his intention to relinquish
      his position as President and Chief Executive Officer of Ameren, effective
      May 1, 2009.  Mr. Rainwater will continue to serve as a director
      and as Executive Chairman of the
company.
(c)
Also
      on March 2, 2009, the Board made the following officer appointments, which
      will be effective May 1, 2009:
Thomas
      R. Voss, 61, will become President and Chief Executive Officer of
      Ameren.  Mr. Voss joined Union Electric Company ("UE") in 1969
      as an engineer. He was elected senior vice president of UE, Central
      Illinois Public Service Company ("CIPS"), and Ameren Services Company
      ("Ameren Services") in 1999, of Ameren Energy Generating Company ("Genco")
      in 2001, of CILCORP Inc. ("CILCORP") and Central Illinois Light Company
      ("CILCO") in 2003, and of Illinois Power Company ("IP") in
      2004.  Each of UE, CIPS, Ameren Services, Genco, CILCORP, CILCO
      and IP is a subsidiary of Ameren.  In 2003, Mr. Voss was elected
      president of Genco; he relinquished his presidency of this company in
      2004. He was elected executive vice president and chief operating officer
      of Ameren in 2005. In 2006, he was elected executive vice president of UE,
      CIPS, CILCORP, CILCO and IP. In 2007, Mr. Voss was elected chairman, chief
      executive officer, and president of UE. He relinquished his positions at
      CIPS, CILCORP, CILCO and IP in 2007, and will relinquish his positions at
      UE effective May 1, 2009.  Upon Mr. Voss's assumption of his new
      responsibilities, the position of chief operating officer of Ameren will
      be eliminated.
Effective
      as of May 1, 2009, Mr. Voss's base salary will be increased from $477,400
      to $750,000.  In addition, the target cash bonus for which he is
      eligible under Ameren's 2009 executive incentive plan ("EIP"), described
      in the Compensation Discussion & Analysis section of Ameren's
      definitive proxy statement for its 2008 annual meeting of shareholders
      filed with the Securities and Exchange Commission on March 6, 2008
      ("CD&A"), has been increased, effective May 1, 2009, from 60% to 90%
      of his base salary.  Mr. Voss's actual bonus under this program
      may vary from target based on his performance, UE's performance for the
      first four months of 2009 and Ameren's performance in accordance with the
      formulas and methodologies employed in the EIP, which are described in the
      CD&A.
Warner
      L. Baxter, 47, will relinquish his position as Executive Vice President
      and Chief Financial Officer of Ameren to become President and Chief
      Executive Officer of UE. Effective as of May 1, 2009 with his change in
      position, Mr. Baxter's base salary will be increased from $552,900 to
      $575,000.
-2-
Mr.
      Baxter will be succeeded by Martin J. Lyons, 42, who will become Chief
      Financial Officer of Ameren, while maintaining his current
      responsibilities as Senior Vice President and principal accounting
      officer.  Mr. Lyons joined Ameren, UE, CIPS, Genco, and Ameren
      Services in 2001 as controller. He was elected controller of CILCORP and
      CILCO in 2003. He was also elected vice president of Ameren, UE, CIPS,
      Genco, CILCORP, CILCO, and Ameren Services in 2003 and vice president and
      controller of IP in 2004. In 2007, his position at UE was changed to vice
      president and principal accounting officer. In 2008, Mr. Lyons was elected
      senior vice president and chief accounting officer of the Ameren
      companies.
Effective
      as of May 1, 2009, Mr. Lyons's base salary will be increased from $314,600
      to $390,000.  In addition, the target cash bonus for which he is
      eligible under the EIP, described in the CD&A, has been increased from
      50% to 60% of his base salary.  Mr. Lyons's actual bonus under
      this program may vary from target based on his performance and Ameren's
      performance in accordance with the formulas and methodologies employed in
      the EIP, which are described in the
CD&A.
(e)
Effective
      as of May 1, 2009 with his change in position, Mr. Rainwater's base salary
      will be decreased from $940,000 to $450,000.  In addition, the
      target cash bonus for which he is eligible under the EIP, described in the
      CD&A, has been decreased from 90% to 60% of his base
      salary.  Mr. Rainwater's actual bonus under this program may
      vary from target based on his performance and Ameren's performance in
      accordance with the formulas and methodologies employed in the EIP, which
      are described in the CD&A.
In
      addition, on March 2, 2009, the Human Resources Committee of Ameren's
      Board (the "Committee") authorized the issuance pursuant to the 2006
      Omnibus Incentive Compensation Plan (the "Omnibus Plan") of performance
      share unit awards for 2009 to the executive officers identified on the
      table attached as Exhibit 99.1 (collectively, the "Executive
      Officers").  Each performance share unit represents the right to
      receive a share of Ameren's common stock assuming certain performance
      criteria are achieved.  The actual number of performance share
      units which may be earned will vary from 0 percent to
      200 percent of the target number of performance share units granted
      to each Executive Officer, based primarily on Ameren's three-year total
      shareholder return ("TSR") relative to a utility peer group and continued
      employment during such three-year period (the "Performance
      Period").  In the event Ameren's TSR relative to utility peers
      during the Performance Period is below the 30th percentile, no performance
      share units will be earned unless Ameren's earnings per share during each
      year of the Performance Period, as determined by the Committee for this
      purpose, equals or exceeds $2.54.
Dividends
on performance share units will accrue and be reinvested into additional
performance share units throughout the Performance Period.  Because
these performance share units will be earned only if performance goals over the
Performance Period are attained, the amounts, if any, that will be payable to
the Executive Officers pursuant to the performance share unit awards described
above are not determinable at this time.  The Committee has the
ability to amend the terms of the performance share unit awards, including the
performance criteria, to the extent not adverse to the holders of an
award.
-3-
The form
of performance share unit award for 2009 is attached as Exhibit 10.1 and is
incorporated herein by reference.  The target number of performance
share units issued to each Executive Officer for 2009 pursuant to the Omnibus
Plan is set forth in the table attached as Exhibit 99.1 and is incorporated
by reference herein.
The award
agreements between Ameren and each of the Executive Officers provide that upon
the occurrence of a "Change of Control" if Ameren continues to exist and its
common stock is traded on the New York Stock Exchange ("NYSE") or NASDAQ Stock
Market ("NASDAQ") (i) voluntary terminations of employment prior to the end of
the performance period or terminations for "Cause" at any time prior to pay out
of shares result in forfeiture of awards and (ii) a "qualifying termination" (as
defined in the award agreement) of employment during the performance period does
not change the manner in which awards are earned and become vested on
December 31, 2011 and such awards will be paid in shares of Ameren common
stock on January 1, 2012 or as soon as practicable thereafter.
The award
agreements referenced above also provide that upon a "Change of Control" which
occurs on or before December 31, 2011, if Ameren ceases to exist or its
common stock is no longer traded on the NYSE or NASDAQ, the Omnibus Plan will be
terminated and (i) the target number of performance share units together with
accrued dividends thereon will be converted into nonqualified deferred
compensation which will accrue interest at the prime rate as provided in the
award agreement and, assuming continued employment, such amount will vest and be
paid out on December 31, 2011, (ii) voluntary terminations of
employment or terminations for "Cause" result in forfeiture of the amounts
described above in (i) of this paragraph and (iii) qualifying terminations of
employment result in an immediate payment of the amounts described above in (i)
of this paragraph (except as otherwise provided in the awards).
The terms
"Change of Control" and "Cause" have the meanings given them in the Second
Amended and Restated Ameren Corporation Change of Control Severance Plan,
effective October 10, 2008 (the "Plan"), to be filed as an exhibit to Ameren's
Annual Report on Form 10-K for the 2008 fiscal year,
provided
that the terms
"Change of Control" and "Cause" are defined therein as they were defined in the
Amended and Restated Ameren Corporation Change of Control Severance Plan, a copy
of which was filed as Exhibit 10.5 to Ameren's Current Report filed on
Form 8-K dated February 16, 2006, and which has been replaced by the
Plan.
Item
      7.01
Regulation
      FD Disclosure.
A copy of
the press release announcing certain executive management changes at Ameren to
be effective May 1, 2009, as well as new nominees for election to Ameren's
Board, is attached as Exhibit 99.2 and incorporated by reference
herein.  The information furnished pursuant to this Item 7.01,
including Exhibit 99.2, shall not be deemed "filed" for purposes of
Section 18 of the Securities Exchange Act of 1934 (the "Exchange Act") or
otherwise subject to the liabilities under that Section and shall not be deemed
to be incorporated by reference into any filing of Ameren under the Securities
Act of 1933 or the Exchange Act.
-4-
Item
      9.01
Financial
      Statements and Exhibits.
(d)
Exhibits.
Exhibit
      Number:
Title:
10.1
Form
      of Performance Share Unit for Award Issued in 2009 pursuant to
2006
      Omnibus Incentive Compensation Plan.
99.1
Table
      of 2009 Target Performance Share Unit Awards Issued to
Executive
      Officers.
99.2
Press
      release, dated March 2, 2009, regarding certain executive
management
      changes at Ameren to be effective May 1, 2009, as well as
new
      nominees for election to Ameren's board of
  directors.
-5-
Signatures
Pursuant
to the requirements of the Securities Exchange Act of 1934, Ameren has duly
caused this report to be signed on its behalf by the undersigned thereunto duly
authorized.
Ameren
      Corporation
(Registrant)
By:
/s/ Steven R.
      Sullivan
Steven
      R. Sullivan
Senior
      Vice President, General Counsel and
Secretary
Date:  March
2, 2009
-6-
Exhibit
Index
Exhibit
      Number:
Title:
10.1
Form
      of Performance Share Unit for Award Issued in 2009
pursuant
      to 2006 Omnibus Incentive Compensation Plan.
99.1
Table
      of 2009 Target Performance Share Unit Awards Issued to
Executive
      Officers.
99.2
Press
      release, dated March 2, 2009, regarding certain executive
management
      changes
at
      Ameren to be
effective
      May 1, 2009, as
well
      as new nominees for election to Ameren's board of
    directors.