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    <div style="DISPLAY: block; TEXT-INDENT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UNITED
STATES</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
AND EXCHANGE COMMISSION</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">Washington,
D.C.&#160;&#160;20549</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="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">FORM
8-K</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">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; 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-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of
report (Date of earliest event reported):</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="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">February
8, 2008</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
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            <td colspan="3" valign="top" width="2%">
              <div style="TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren
      Corporation</font> </div>
              <div style="TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Exact
      name of registrant as specified in its charter)</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="20%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            <td valign="top" width="45%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            <td valign="top" width="19%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
          </tr>
          <tr>
            <td valign="top" width="20%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: -0.9pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Missouri</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: -0.9pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(State
      or other </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: -0.9pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">jurisdiction
      of </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: -0.9pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">incorporation)</font></div>
            </td>
            <td valign="top" width="45%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1-14756</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Commission</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">File
      Number)</font></div>
            </td>
            <td valign="top" width="19%">
              <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">43-1723446</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">(I.R.S.
      Employer </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">Identification
      No.)</font></div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="20%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            <td valign="top" width="45%">
              <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              <div align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1901
      Chouteau Avenue, St. Louis, Missouri 63103</font></div>
              <div align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Address
      of principal executive offices and Zip Code)</font></div>
              <div align="center">&#160;</div>
              <div align="center">&#160;</div>
            </td>
            <td valign="top" width="19%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
          </tr>
          <tr>
            <td colspan="3" valign="top" width="13%" style="TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font>&#160; <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registrant&#8217;s
      telephone number, including area code:&#160;&#160;(314)
  621-3222</font></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">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:</font></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;&#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>
          </tr>
      </table>
    </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;&#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>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
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            <td style="WIDTH: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#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&#160;CFR 240.14d-2(b))</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: 36pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#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&#160;CFR 240.13e-4(c))</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="FONT-WEIGHT: bold">Item 5.02&#160;</font> </font></div>
            </td>
            <td>
              <div align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Departure
      of Directors or Certain Officers; Election of Directors; </font></div>
              <div align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Appointment
      of Certain Officers; Compensatory Arrangements of Certain </font></div>
              <div align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Officers.</font></div>
            </td>
          </tr>
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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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            <td style="WIDTH: 22.5pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      accordance with the director retirement age provisions of Ameren
      Corporation&#8217;s (&#8220;Ameren&#8221;) Corporate Governance Guidelines, Gordon R. Lohman
      and Richard A. Liddy, Ameren directors, offered to complete the term of
      their service on Ameren&#8217;s Board of Directors, effective April&#160;22,
      2008, the end of their term as directors and not be nominated for
      re-election to the Board.&#160;&#160;On February 8, 2008 the Board of
      Directors accepted their offers effective April 22,
  2008.</font></div>
            </td>
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      </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: 22.5pt">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(e)&#160;
      </font></div>
            </td>
            <td>
              <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      February&#160;8, 2008, the Human Resources Committee of the Board of
      Directors (the &#8220;Committee&#8221;) of Ameren approved and the full Board of
      Directors of Ameren ratified the following
  actions:</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%">
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            <td>
            </td>
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              <div style="TEXT-INDENT: 18pt"><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">Establishment
      of Ameren earnings per share (&#8220;EPS&#8221;) achievement levels for the 2008
      Ameren Executive Incentive Plan (the &#8220;2008 EIP&#8221;).&#160;&#160;The 2008 EIP,
      which was approved by the Committee and ratified by the full Board of
      Directors on December 14, 2007, provides for the payment of cash awards to
      the Named Executive Officers in 2009 based on corporate and/or business
      segment results and individual performance in 2008.&#160;&#160;The 2008
      EIP was filed as Exhibit 99.1 to and described in Ameren&#8217;s Current Report
      on Form 8-K filed December 18, 2007, which Exhibit 99.1 and description
      are incorporated herein by reference.&#160;&#160;The Board ratified Ameren
      EPS threshold, target and maximum Ameren EPS achievement levels under the
      2008 EIP of $2.70, $3.00 and $3.30, respectively.&#160;&#160;As Messrs.
      Voss and Naslund have business segment responsibility, their 2008 EIP
      incentive compensation opportunity is based 50% on Ameren EPS and 50% on
      Missouri regulated business segment contribution to Ameren
      EPS.&#160;&#160;The Board also ratified threshold, target and maximum
      Missouri regulated business segment contribution to Ameren EPS of $1.14,
      $1.27 and $1.40, respectively.</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>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
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            <td>
            </td>
            <td style="WIDTH: 36pt">
              <div style="TEXT-INDENT: 18pt; TEXT-ALIGN: left"><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">Authorization
      of the issuance pursuant to the 2006 Omnibus Incentive Compensation Plan
      of&#160;performance share unit awards for 2008 to the Named Executive
      Officers.&#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 earned will vary from 0 percent to 200 percent of the target number
      of performance share units granted to each Named Executive Officer, based
      primarily on Ameren&#8217;s three-year total shareholder return relative to a
      utility peer group and continued employment during such three-year period
      (the &#8220;Performance Period&#8221;).&#160;&#160;Once earned, performance share
      units continue to track with Ameren&#8217;s common stock price for two years
      (the &#8220;Holdback Period&#8221;), at which time the performance share units are
      paid in Ameren&#8217;s common stock.&#160;&#160;Dividends on performance share
      units will accrue and be reinvested into additional performance share
      units throughout the Performance Period.&#160;&#160;Dividends will be paid
      on a current basis during the Holdback Period. Because these performance
      share units will be earned only if performance goals over Performance
      Periods are attained, the amounts, if any, that will be payable to the
      Named Executive Officers pursuant to the performance
  </font></div>
            </td>
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    </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">-2-</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: justify" align="justify">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.</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
target number of performance share units issued to each Named Executive Officer
for 2008 pursuant to the 2006 Omnibus Incentive Compensation Plan is set forth
in the table attached as Exhibit&#160;99.1 and is incorporated by reference
herein.&#160;&#160;The form of performance share unit award was filed as
Exhibit&#160;10.2 to Ameren&#8217;s combined Current Report on Form&#160;8-K filed
February&#160;10, 2006 and is incorporated herein by reference.&#160;&#160;The
award agreements between Ameren and each of the Named Executive Officers provide
certain &#8220;change of control&#8221; acceleration benefits and payouts as described in
the February 10, 2006 Current Report on Form 8-K, which description is
incorporated herein by reference.</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 style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt">
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
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            <td style="WIDTH: 95px">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="FONT-WEIGHT: bold">Item 9.01&#160;</font> </font></div>
            </td>
            <td width="887"><font style="DISPLAY: inline; FONT-WEIGHT: bold"><font size="2">Financial Statements and
Exhibits.</font></font></td>
          </tr>
      </table><br></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">(d)&#160;&#160;Exhibits</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</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"><font style="TEXT-DECORATION: underline">Exhibit
      Number</font>:</font></font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Title:</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">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 Target 2008 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">Named
      Executive Officers.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div>&#160;</div>
    <div><br>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
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      <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">
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      </div>
      <div id="HDR">
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        </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">AMEREN&#160;CORPORATION</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="justify"><font style="TEXT-DECORATION: underline">/s/ Martin J.
Lyons&#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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</font></div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin J.
Lyons</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
Vice President and Chief Accounting Officer</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 315pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Principal
Accounting Officer)</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:&#160;&#160;February
14, 2008</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
      </div>
      <div id="HDR">
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      </div>
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    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>&#160;</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 style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">
          <tr>
            <td valign="top" width="32%">
              <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">Exhibit
      Number:</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
            </td>
            <td valign="top" width="48%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 90pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-VARIANT: small-caps">Title:</font></div>
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          </tr>
          <tr>
            <td valign="top" width="32%">
              <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="48%">
              <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 Target 2008 Performance Share Unit Awards </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">Issued
      to Named Executive Officers.</font></div>
            </td>
          </tr>
      </table>
    </div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div><br><br>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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ameren8kfeb142008.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):
February
8, 2008
Ameren
      Corporation
(Exact
      name of registrant as specified in its charter)
Missouri
(State
      or other
jurisdiction
      of
incorporation)
1-14756
(Commission
File
      Number)
43-1723446
(I.R.S.
      Employer
Identification
      No.)
1901
      Chouteau Avenue, St. Louis, Missouri 63103
(Address
      of principal executive offices and Zip Code)
Registrant's
      telephone number, including area code:  (314)
  621-3222
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)
In
      accordance with the director retirement age provisions of Ameren
      Corporation's ("Ameren") Corporate Governance Guidelines, Gordon R. Lohman
      and Richard A. Liddy, Ameren directors, offered to complete the term of
      their service on Ameren's Board of Directors, effective April 22,
      2008, the end of their term as directors and not be nominated for
      re-election to the Board.  On February 8, 2008 the Board of
      Directors accepted their offers effective April 22,
  2008.
(e)
On
      February 8, 2008, the Human Resources Committee of the Board of
      Directors (the "Committee") of Ameren approved and the full Board of
      Directors of Ameren ratified the following
  actions:
*
Establishment
      of Ameren earnings per share ("EPS") achievement levels for the 2008
      Ameren Executive Incentive Plan (the "2008 EIP").  The 2008 EIP,
      which was approved by the Committee and ratified by the full Board of
      Directors on December 14, 2007, provides for the payment of cash awards to
      the Named Executive Officers in 2009 based on corporate and/or business
      segment results and individual performance in 2008.  The 2008
      EIP was filed as Exhibit 99.1 to and described in Ameren's Current Report
      on Form 8-K filed December 18, 2007, which Exhibit 99.1 and description
      are incorporated herein by reference.  The Board ratified Ameren
      EPS threshold, target and maximum Ameren EPS achievement levels under the
      2008 EIP of $2.70, $3.00 and $3.30, respectively.  As Messrs.
      Voss and Naslund have business segment responsibility, their 2008 EIP
      incentive compensation opportunity is based 50% on Ameren EPS and 50% on
      Missouri regulated business segment contribution to Ameren
      EPS.  The Board also ratified threshold, target and maximum
      Missouri regulated business segment contribution to Ameren EPS of $1.14,
      $1.27 and $1.40, respectively.
*
Authorization
      of the issuance pursuant to the 2006 Omnibus Incentive Compensation Plan
      of performance share unit awards for 2008 to the Named 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 earned will vary from 0 percent to 200 percent of the target number
      of performance share units granted to each Named Executive Officer, based
      primarily on Ameren's three-year total shareholder return relative to a
      utility peer group and continued employment during such three-year period
      (the "Performance Period").  Once earned, performance share
      units continue to track with Ameren's common stock price for two years
      (the "Holdback Period"), at which time the performance share units are
      paid in Ameren's common stock.  Dividends on performance share
      units will accrue and be reinvested into additional performance share
      units throughout the Performance Period.  Dividends will be paid
      on a current basis during the Holdback Period. Because these performance
      share units will be earned only if performance goals over Performance
      Periods are attained, the amounts, if any, that will be payable to the
      Named Executive Officers pursuant to the performance
-2-
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.
The
target number of performance share units issued to each Named Executive Officer
for 2008 pursuant to the 2006 Omnibus Incentive Compensation Plan is set forth
in the table attached as Exhibit 99.1 and is incorporated by reference
herein.  The form of performance share unit award was filed as
Exhibit 10.2 to Ameren's combined Current Report on Form 8-K filed
February 10, 2006 and is incorporated herein by reference.  The
award agreements between Ameren and each of the Named Executive Officers provide
certain "change of control" acceleration benefits and payouts as described in
the February 10, 2006 Current Report on Form 8-K, which description is
incorporated herein by reference.
Item 9.01
Financial Statements and
Exhibits.
(d)  Exhibits
Exhibit
      Number
:
Title:
99.1
Table
      of Target 2008 Performance Share Unit Awards Issued to
Named
      Executive Officers.
-3-
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)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
(Principal
Accounting Officer)
Date:  February
14, 2008
-4-
Exhibit
Index
Exhibit
      Number:
Title:
99.1
Table
      of Target 2008 Performance Share Unit Awards
Issued
      to Named Executive Officers.