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      AMC Combined 8-K Dated 01/13/06
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      STATES</font></div>
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      AND EXCHANGE COMMISSION</font></div>
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      D.C. 20549</font></div>
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                8-K</font></div>
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      REPORT</font></div>
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      to Section 13 or 15(d) of the</font></div>
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      Exchange Act of 1934</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
      of
      report (Date of earliest event reported):</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><a name="ReportDate"/></div>
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                9 , 2006</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Commission
                File Number</u></font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exact
                Name of Registrant as Specified in Charter;</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">State
                of Incorporation;</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Address
                and Telephone Number</u></font></div>
            </td>
            <td align="justify" valign="top" width="27%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">IRS
                Employer</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Identification
                Number</u></font></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><a name="Jurisdiction"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-14756</font></a></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><a name="CFN"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
                Corporation</font></a></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Missouri
                Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1901
                Chouteau Avenue</font></div>
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                Louis, Missouri 63103</font></div>
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                621-3222</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Missouri
                Corporation)</font></div>
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                Chouteau Avenue</font></div>
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                Louis, Missouri 63103</font></div>
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                621-3222</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-3672</font></div>
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                Illinois Public Service Company</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Illinois
                Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">607
                East Adams Street</font></div>
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                523-3600</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-0211380</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">333-56594</font></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
                Energy Generating Company</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Illinois
                Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1901
                Chouteau Avenue</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">St.
                Louis, Missouri 63103</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(314)
                621-3222</font></div>
            </td>
            <td align="left" valign="top" width="27%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-1395586</font></div>
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      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>
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      ]
      Written communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
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      ]
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
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      ]
      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))</font></div>
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      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
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      (17 CFR 240.13e-4(c))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECTION
      1
      - REGISTRANT&#8217;S BUSINESS AND OPERATIONS</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      1.01
      Entry into a Material Definitive Agreement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Reference
          is made to Note 3 - Rate and Regulatory Matters and Note 8 - Related Party
          Transactions to financial statements under Part I, Item 1, and Outlook
          under
          Part I, Item 2. Management&#8217;s Discussion and Analysis of Financial Condition and
          Results of Operations, in the Form 10-Q for the quarterly period ended
          September
          30, 2005, of registrant Ameren Corporation (&#8220;Ameren&#8221;) and its registrant
          subsidiaries, Union Electric Company, doing business as AmerenUE (&#8220;UE&#8221;), Central
          Illinois Public Service Company, doing business as AmerenCIPS (&#8220;CIPS&#8221;), and
          Ameren Energy Generating Company (&#8220;Genco&#8221;) for a discussion of an amendment to
          the joint dispatch agreement among UE, CIPS and Genco which was required
          by the
          order issued by the Missouri Public Service Commission (&#8220;MoPSC&#8221;) approving UE&#8217;s
          transfer of its Illinois electric and natural gas service territory to
          CIPS. The
          joint dispatch agreement as amended effective May 1, 2000 (&#8220;First Amended JDA&#8221;)
          (filed as Exhibit 10.4 in File No. 333-56594), under which UE and Genco
          jointly
          dispatch electric generation, provides each affiliate the option to serve
          its
          load requirements from its own generation first and then to allow access
          to any
          available remaining generation to its affiliate at incremental cost. Any
          excess
          generation not used by UE or Genco to serve load requirements is sold to
          third
          parties on a short-term basis. Under the provisions of the First Amended
          JDA,
          the margins or profits from third party sales were required to be allocated
          between UE and Genco using the ratio of each company&#8217;s load requirements to the
          companies&#8217; combined load regardless of which company sourced the power. The
          order of the MoPSC referred to above required an amendment to the First
          Amended
          JDA to provide that margins on third party short-term power sales be allocated
          between UE and Genco based on generation output and not on load requirements.
          </font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
          compliance with the MoPSC order, UE, CIPS and Genco on January 9, 2006
          entered
          into an amendment to the First Amended JDA to effectuate the change required
          by
          the MoPSC. This amendment, referred to as the Second Amendment to the Joint
          Dispatch Agreement (&#8220;Second Amended JDA&#8221;), provided that it was effective
          January 10, 2006, subject to acceptance and approval by the Federal Energy
          Regulatory Commission (&#8220;FERC&#8221;). A copy of the text of the Second Amended JDA is
          included as Exhibit 10.1. UE, CIPS and Genco filed their joint request
          for
          acceptance and approval of the amendment with the FERC on January 9, 2006.
          The
          registrants are unable to predict the action that the FERC will take in
          response
          to the Second Amended JDA.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
          change reflected in the Second Amended JDA would affect the allocation
          between
          Genco and UE of margins on excess generation sold. Based on operating
          performance for 2005, such change would likely have resulted in a transfer
          of
          electric margins from Genco to UE of $35 to $45 million based on certain
          assumptions and historical results. The ultimate impact of the amendment
          will be
          determined by future native load demand, the availability of electric generation
          from UE and Genco and market prices, among other things, but such impact
          could
          be material. Ameren&#8217;s earnings could be affected if electric rates for UE are
          adjusted by the MoPSC to reflect the provisions of the MoPSC order discussed
          above, including the Second Amended JDA, and/or other changes to the joint
          dispatch agreement.</font></div>
      </div>
    </div>
    <div>&#160;</div>
    <div>&#160;</div>
    <div>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">-
          2
          -</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: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECTION
      9
      - FINANCIAL STATEMENTS AND EXHIBITS</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      9.01
      Financial Statements and Exhibits.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)
      Exhibits</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibit
      Number:</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Title:</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td align="right" style="width: 81pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
              10.1&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Second Amendment to the Joint Dispatch Agreement</font></div>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                among UE, CIPS and Genco&#160;dated January 9,
                2006</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>This
      combined Form 8-K is being
      filed separately by Ameren Corporation, Union Electric Company, Central Illinois
      Public Service Company and Ameren Energy Generating Company, (each a
&#8220;registrant&#8221;). Information contained herein relating to any individual
      registrant has been filed by such registrant on its own behalf. No registrant
      makes any representation as to information relating to any other
      registrant.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SIGNATURES</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Exchange Act of 1934, each registrant
      has
      duly caused this report to be signed on its behalf by the undersigned thereunto
      duly authorized. The signature for each undersigned company shall be deemed
      to
      relate only to matters having reference to such company or its
      subsidiaries.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">
      <table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">

          <tr valign="top" bgcolor="#ffffff">
            <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td colspan="2">
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">AMEREN
                CORPORATION</font></div>
              <div><font size="2">(Registrant)</font></div>
            </td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td>&#160;</td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">/s/
              Martin J. Lyons&#160;</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
            <td align="left">
              <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
              J. Lyons</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td>
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Vice
                President and Controller</font></div>
              <div><font size="2">(Principal Accounting
                Officer)</font></div>
            </td>
          </tr>

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

            <tr valign="top" bgcolor="#ffffff">
              <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td colspan="2">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">UNION
                  ELECTRIC COMPANY</font></div>
                <div><font size="2">(Registrant)</font></div>
              </td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td>&#160;</td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">/s/
                Martin J. Lyons&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
              <td align="left">
                <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
                J. Lyons</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td>
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Vice
                  President and Controller</font></div>
                <div><font size="2">(Principal Accounting
                  Officer)</font></div>
              </td>
            </tr>

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

            <tr valign="top" bgcolor="#ffffff">
              <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td colspan="2">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">CENTRAL
                  ILLINOIS PUBLIC SERVICE COMPANY</font></div>
                <div><font size="2">(Registrant)</font></div>
              </td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td>&#160;</td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">/s/
                Martin J. Lyons&#160;</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
              <td align="left">
                <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
                J. Lyons</font></td>
            </tr>
            <tr valign="top" bgcolor="#ffffff">
              <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
              <td>
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Vice
                  President and Controller</font></div>
                <div><font size="2">(Principal Accounting
                  Officer)</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: 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: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">
          <div>
            <table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">

                <tr valign="top" bgcolor="#ffffff">
                  <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
                  <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
                  <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
                </tr>
                <tr valign="top" bgcolor="#ffffff">
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
                  <td colspan="2">
                    <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">AMEREN
                      ENERGY GENERATING COMPANY</font></div>
                    <div><font size="2">(Registrant)</font></div>
                  </td>
                </tr>
                <tr valign="top" bgcolor="#ffffff">
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
                </tr>
                <tr valign="top" bgcolor="#ffffff">
                  <td>&#160;</td>
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;&#160;</font></td>
                  <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">/s/
                    Martin J. Lyons&#160;</font></td>
                </tr>
                <tr valign="top" bgcolor="#ffffff">
                  <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
                  <td align="left">
                    <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
                    J. Lyons</font></td>
                </tr>
                <tr valign="top" bgcolor="#ffffff">
                  <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
                  <td>
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                      President and Controller</font></div>
                    <div><font size="2">(Principal Accounting
                      Officer)</font></div>
                  </td>
                </tr>

            </table>
          </div><br></div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:
      January 13, 2006</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>&#160;</div>
    <div>&#160;</div>
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      Number:</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Title:</u></font></div>
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            <td align="right" style="width: 81pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.1&#160;&#160;</font></td>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                Second Amendment to the Joint Dispatch Agreement</font></div>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font size="2">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                among UE, CIPS and Genco dated January 9,
                2006</font></div>
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AMC Combined 8-K Dated 01/13/06
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):
January
                9 , 2006
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
1-2967
Union
                Electric Company
(Missouri
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
43-0559760
1-3672
Central
                Illinois Public Service Company
(Illinois
                Corporation)
607
                East Adams Street
Springfield,
                Illinois 62739
(217)
                523-3600
37-0211380
333-56594
Ameren
                Energy Generating Company
(Illinois
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
37-1395586
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))
SECTION
      1
      - REGISTRANT'S BUSINESS AND OPERATIONS
ITEM
      1.01
      Entry into a Material Definitive Agreement.
Reference
          is made to Note 3 - Rate and Regulatory Matters and Note 8 - Related Party
          Transactions to financial statements under Part I, Item 1, and Outlook
          under
          Part I, Item 2. Management's Discussion and Analysis of Financial Condition and
          Results of Operations, in the Form 10-Q for the quarterly period ended
          September
          30, 2005, of registrant Ameren Corporation ("Ameren") and its registrant
          subsidiaries, Union Electric Company, doing business as AmerenUE ("UE"), Central
          Illinois Public Service Company, doing business as AmerenCIPS ("CIPS"), and
          Ameren Energy Generating Company ("Genco") for a discussion of an amendment to
          the joint dispatch agreement among UE, CIPS and Genco which was required
          by the
          order issued by the Missouri Public Service Commission ("MoPSC") approving UE's
          transfer of its Illinois electric and natural gas service territory to
          CIPS. The
          joint dispatch agreement as amended effective May 1, 2000 ("First Amended JDA")
          (filed as Exhibit 10.4 in File No. 333-56594), under which UE and Genco
          jointly
          dispatch electric generation, provides each affiliate the option to serve
          its
          load requirements from its own generation first and then to allow access
          to any
          available remaining generation to its affiliate at incremental cost. Any
          excess
          generation not used by UE or Genco to serve load requirements is sold to
          third
          parties on a short-term basis. Under the provisions of the First Amended
          JDA,
          the margins or profits from third party sales were required to be allocated
          between UE and Genco using the ratio of each company's load requirements to the
          companies' combined load regardless of which company sourced the power. The
          order of the MoPSC referred to above required an amendment to the First
          Amended
          JDA to provide that margins on third party short-term power sales be allocated
          between UE and Genco based on generation output and not on load requirements.
In
          compliance with the MoPSC order, UE, CIPS and Genco on January 9, 2006
          entered
          into an amendment to the First Amended JDA to effectuate the change required
          by
          the MoPSC. This amendment, referred to as the Second Amendment to the Joint
          Dispatch Agreement ("Second Amended JDA"), provided that it was effective
          January 10, 2006, subject to acceptance and approval by the Federal Energy
          Regulatory Commission ("FERC"). A copy of the text of the Second Amended JDA is
          included as Exhibit 10.1. UE, CIPS and Genco filed their joint request
          for
          acceptance and approval of the amendment with the FERC on January 9, 2006.
          The
          registrants are unable to predict the action that the FERC will take in
          response
          to the Second Amended JDA.
The
          change reflected in the Second Amended JDA would affect the allocation
          between
          Genco and UE of margins on excess generation sold. Based on operating
          performance for 2005, such change would likely have resulted in a transfer
          of
          electric margins from Genco to UE of $35 to $45 million based on certain
          assumptions and historical results. The ultimate impact of the amendment
          will be
          determined by future native load demand, the availability of electric generation
          from UE and Genco and market prices, among other things, but such impact
          could
          be material. Ameren's earnings could be affected if electric rates for UE are
          adjusted by the MoPSC to reflect the provisions of the MoPSC order discussed
          above, including the Second Amended JDA, and/or other changes to the joint
          dispatch agreement.
-
          2
          -
SECTION
      9
      - FINANCIAL STATEMENTS AND EXHIBITS
ITEM
      9.01
      Financial Statements and Exhibits.
(d)
      Exhibits
Exhibit
      Number:
Title:
10.1
Second Amendment to the Joint Dispatch Agreement
among UE, CIPS and Genco dated January 9,
                2006
This
      combined Form 8-K is being
      filed separately by Ameren Corporation, Union Electric Company, Central Illinois
      Public Service Company and Ameren Energy Generating Company, (each a
"registrant"). Information contained herein relating to any individual
      registrant has been filed by such registrant on its own behalf. No registrant
      makes any representation as to information relating to any other
      registrant.
SIGNATURES
Pursuant
      to the requirements of the Securities Exchange Act of 1934, each registrant
      has
      duly caused this report to be signed on its behalf by the undersigned thereunto
      duly authorized. The signature for each undersigned company shall be deemed
      to
      relate only to matters having reference to such company or its
      subsidiaries.
AMEREN
                CORPORATION
(Registrant)
/s/
              Martin J. Lyons
Martin
              J. Lyons
Vice
                President and Controller
(Principal Accounting
                Officer)
UNION
                  ELECTRIC COMPANY
(Registrant)
/s/
                Martin J. Lyons
Martin
                J. Lyons
Vice
                  President and Controller
(Principal Accounting
                  Officer)
CENTRAL
                  ILLINOIS PUBLIC SERVICE COMPANY
(Registrant)
/s/
                Martin J. Lyons
Martin
                J. Lyons
Vice
                  President and Controller
(Principal Accounting
                  Officer)
-
            3
            -
AMEREN
                      ENERGY GENERATING COMPANY
(Registrant)
/s/
                    Martin J. Lyons
Martin
                    J. Lyons
Vice
                      President and Controller
(Principal Accounting
                      Officer)
Date:
      January 13, 2006
-
          4
          -
Exhibit
      Index
Exhibit
      Number:
Title:
10.1
Second Amendment to the Joint Dispatch Agreement
among UE, CIPS and Genco dated January 9,
                2006
-
          5
          -