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      AMC Combined 8-K Dated 09/27/05
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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">UNITED
      STATES</font></div>
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      AND EXCHANGE COMMISSION</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
      D.C. 20549</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font size="2">____________________________</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">FORM
                8-K</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">CURRENT
      REPORT</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to Section 13 or 15(d) of the Securities Exchange Act of 1934</font></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="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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      <table cellpadding="0" cellspacing="0" width="100%">

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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">September
                27, 2005</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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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>
            </td>
            <td align="left" valign="top" width="26%" style="BORDER-BOTTOM: medium none">
              <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 </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">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>
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                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>
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                Number</u></font></div>
            </td>
          </tr>
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            <td align="left" valign="top" width="26%">
              <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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                Corporation</font></div>
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                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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                Louis, Missouri 63103</font></div>
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                621-3222</font></div>
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                Corporation)</font></div>
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            </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">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            </td>
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            <td align="left" valign="top" width="26%">
              <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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            </td>
            <td align="left" valign="top" width="26%">
              <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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                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>
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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>
            </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>
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            <td align="left" valign="top" width="26%">
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            </td>
            <td align="left" valign="top" width="26%">
              <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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                Inc.</font></div>
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                Corporation)</font></div>
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                677-5271</font></div>
            </td>
            <td align="justify" valign="top" width="27%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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      </table>
      <div>&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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        <table cellpadding="0" cellspacing="0" width="100%">

            <tr>
              <td align="left" valign="top" width="26%">
                <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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              </td>
              <td align="left" valign="top" width="26%">
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                  Illinois Light 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">300
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                  Illinois 61602</font></div>
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                  677-5271</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">1-3004</font></div>
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                  Power Company</font></div>
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                  Corporation)</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"><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"><a name="Address"/><a name="Zip"><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></a></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: 18pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><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>
    <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: 18pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><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>
    <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: 18pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: -4.5pt" align="left"><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>
    <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: 18pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><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>
    <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 style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECTION
      8
      - OTHER EVENTS</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
      8.01
      Other Events.</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">Reference
      is made to Outlook under Part I, Item 2. Management&#8217;s Discussion and Analysis of
      Financial Condition and Results of Operations of the combined Form 10-Q for
      the
      quarterly period ended June 30, 2005, of registrant Ameren Corporation
      (&#8220;Ameren&#8221;) and its registrant subsidiaries for a discussion of the estimated
      increase in average Illinois electric rates after the expiration of the
      legislative electric rate freeze on January 1, 2007, for Central Illinois Public
      Service Company, doing business as AmerenCIPS, Central Illinois Light Company,
      doing business as AmerenCILCO and Illinois Power Company, doing business as
      AmerenIP, (collectively, the &#8220;Ameren Illinois Utilities&#8221;) which was reported by
      Ameren during Illinois legislative hearings held in March 2005. Reference is
      also made to the combined Current Report on Form 8-K dated September 15, 2005,
      of Ameren and its registrant subsidiaries for a discussion of, among other
      things, a letter dated September 2, 2005, from Illinois Governor Blagojevich
      to
      the Illinois Commerce Commission (&#8220;ICC&#8221;) expressing his opposition to the Ameren
      Illinois Utilities&#8217; proposed reverse auction process for procuring electric
      generation to take effect after the current Illinois electric rate freeze
      expires and requesting dismissal of the Ameren Illinois Utilities&#8217; pending
      proceeding for approval of such process (the &#8220;Governor&#8217;s letter&#8221;) (Exhibit 99.1
      thereto) and for a discussion of the Ameren Illinois Utilities&#8217; September 15,
      2005, response to the Governor&#8217;s letter (Exhibit 99.2 thereto). As reported in
      the Form 10-Q for the quarterly period ended June 30, 2005, Ameren indicated
      at
      the March legislative hearings that it expected the average electric rates
      for
      the Ameren Illinois Utilities, on a combined basis, to increase by 10% to 20%
      in
      2007 over present bundled rate levels, with 50% to 70% of this increase
      resulting from higher power costs based on 2005 market prices for power at
      the
      time of the estimate. </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">Ameren
      reports that updates to the assumptions upon which the above-referenced estimate
      was based currently indicate that the average electric rates for the Ameren
      Illinois Utilities, on a combined basis, may increase by 20% to 35% in 2007
      over
      present bundled rate levels. This new estimate (like the earlier estimate)
      is
      based on a number of assumptions about electricity consumption, market prices
      for power, the type of power supply product to be procured, future auction
      results, infrastructure investment levels, operating and financing costs,
      ratemaking outcomes and various other factors. For the purpose of this new
      estimate, August 2005 power prices in&#160;a range of around&#160;$55 per
      megawatt hour were assumed. Such power prices represent in a range of
      around&#160;70% of the estimated 2007 average electric rate increase. Actual
      results could be significantly different from these assumptions. </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">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
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        <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>
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      <div id="HDR">
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    <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: 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">The
      Ameren Illinois Utilities are unable to predict whether, and to what extent,
      they will be granted the estimated electric rate increases by the ICC. In their
      response to the Governor&#8217;s letter, the Ameren Illinois Utilities stated that
      they look forward to engaging in further dialogue with the Governor and other
      key stakeholders to find a constructive solution to this important matter.
      A
      constructive solution could include a rate increase phase-in plan.</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 id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
      combined Form 8-K is being filed separately by Ameren Corporation, Union
      Electric Company, Central Illinois Public Service Company, Ameren Energy
      Generating Company, CILCORP Inc., Central Illinois Light Company and Illinois
      Power 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="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">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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: 36pt; 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 hereunto
      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">
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            <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
            <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
            <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">AMEREN&#160;CORPORATION</font></div>
              <div><font size="2">(Registrant)</font></div>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
              Martin J. Lyons&#160;</font></td>
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            <td>
              <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
                President and Controller</font></div>
              <div><font size="2">(Principal Accounting
                Officer)</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">
        <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: Times New Roman">&#160;</font></td>
              <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
              <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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            <tr valign="top" bgcolor="#ffffff">
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                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UNION
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                <div><font size="2">(Registrant)</font></div>
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              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
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              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;</font></td>
              <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
                Martin J. Lyons&#160;</font></td>
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                <hr style="COLOR: #000000" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
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            <tr valign="top" bgcolor="#ffffff">
              <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
              <td>
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
                  President and Controller</font></div>
                <div><font size="2">(Principal Accounting
                  Officer)</font></div>
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        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 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: Times New Roman">&#160;</font></td>
                <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
                <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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              <tr valign="top" bgcolor="#ffffff">
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
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                  <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CENTRAL
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                  <div><font size="2">(Registrant)</font></div>
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                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;<br>&#160;</font></td>
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                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;</font></td>
                <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
                  Martin J. Lyons&#160;</font></td>
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              <tr valign="top" bgcolor="#ffffff">
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                <td align="left">
                  <hr style="COLOR: #000000" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
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              </tr>
              <tr valign="top" bgcolor="#ffffff">
                <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></td>
                <td>
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                    President and Controller</font></div>
                  <div><font size="2">(Principal Accounting
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                      <div><font size="2">(Principal Accounting
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                        <div><font size="2">(Registrant)</font></div>
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                        <hr style="COLOR: #000000" align="left" noshade size="2" width="80%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin
                        J. Lyons</font></td>
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                        <div><font size="2">(Principal Accounting
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      September 27, 2005</font></div>
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AMC Combined 8-K Dated 09/27/05
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):
September
                27, 2005
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
37-0211380
333-56594
Ameren
                Energy Generating Company
(Illinois
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
37-1395586
2-95569
CILCORP
                Inc.
(Illinois
                Corporation)
300
                Liberty Street
Peoria,
                Illinois 61602
(309)
                677-5271
37-1169387
1-2732
Central
                  Illinois Light Company
(Illinois
                  Corporation)
300
                  Liberty Street
Peoria,
                  Illinois 61602
(309)
                  677-5271
37-0211050
1-3004
Illinois
                  Power Company
(Illinois
                  Corporation)
500
                  South 27th Street
Decatur,
                  Illinois 62521
(217)
                  424-6600
37-0344645
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
      8
      - OTHER EVENTS
ITEM
      8.01
      Other Events.
Reference
      is made to Outlook under Part I, Item 2. Management's Discussion and Analysis of
      Financial Condition and Results of Operations of the combined Form 10-Q for
      the
      quarterly period ended June 30, 2005, of registrant Ameren Corporation
      ("Ameren") and its registrant subsidiaries for a discussion of the estimated
      increase in average Illinois electric rates after the expiration of the
      legislative electric rate freeze on January 1, 2007, for Central Illinois Public
      Service Company, doing business as AmerenCIPS, Central Illinois Light Company,
      doing business as AmerenCILCO and Illinois Power Company, doing business as
      AmerenIP, (collectively, the "Ameren Illinois Utilities") which was reported by
      Ameren during Illinois legislative hearings held in March 2005. Reference is
      also made to the combined Current Report on Form 8-K dated September 15, 2005,
      of Ameren and its registrant subsidiaries for a discussion of, among other
      things, a letter dated September 2, 2005, from Illinois Governor Blagojevich
      to
      the Illinois Commerce Commission ("ICC") expressing his opposition to the Ameren
      Illinois Utilities' proposed reverse auction process for procuring electric
      generation to take effect after the current Illinois electric rate freeze
      expires and requesting dismissal of the Ameren Illinois Utilities' pending
      proceeding for approval of such process (the "Governor's letter") (Exhibit 99.1
      thereto) and for a discussion of the Ameren Illinois Utilities' September 15,
      2005, response to the Governor's letter (Exhibit 99.2 thereto). As reported in
      the Form 10-Q for the quarterly period ended June 30, 2005, Ameren indicated
      at
      the March legislative hearings that it expected the average electric rates
      for
      the Ameren Illinois Utilities, on a combined basis, to increase by 10% to 20%
      in
      2007 over present bundled rate levels, with 50% to 70% of this increase
      resulting from higher power costs based on 2005 market prices for power at
      the
      time of the estimate.
Ameren
      reports that updates to the assumptions upon which the above-referenced estimate
      was based currently indicate that the average electric rates for the Ameren
      Illinois Utilities, on a combined basis, may increase by 20% to 35% in 2007
      over
      present bundled rate levels. This new estimate (like the earlier estimate)
      is
      based on a number of assumptions about electricity consumption, market prices
      for power, the type of power supply product to be procured, future auction
      results, infrastructure investment levels, operating and financing costs,
      ratemaking outcomes and various other factors. For the purpose of this new
      estimate, August 2005 power prices in a range of around $55 per
      megawatt hour were assumed. Such power prices represent in a range of
      around 70% of the estimated 2007 average electric rate increase. Actual
      results could be significantly different from these assumptions.
-
          2
          -
The
      Ameren Illinois Utilities are unable to predict whether, and to what extent,
      they will be granted the estimated electric rate increases by the ICC. In their
      response to the Governor's letter, the Ameren Illinois Utilities stated that
      they look forward to engaging in further dialogue with the Governor and other
      key stakeholders to find a constructive solution to this important matter.
      A
      constructive solution could include a rate increase phase-in plan.
This
      combined Form 8-K is being filed separately by Ameren Corporation, Union
      Electric Company, Central Illinois Public Service Company, Ameren Energy
      Generating Company, CILCORP Inc., Central Illinois Light Company and Illinois
      Power 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 hereunto
      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)
-
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AMEREN ENERGY
                    GENERATING COMPANY
(Registrant)
/s/
                  Martin J. Lyons
Martin
                  J. Lyons
Vice
                    President and Controller
(Principal Accounting
                    Officer)
CILCORP
                      INC.
(Registrant)
/s/
                    Martin J. Lyons
Martin
                    J. Lyons
Vice
                      President and Controller
(Principal Accounting
                      Officer)
CENTRAL
                        ILLINOIS LIGHT COMPANY
(Registrant)
/s/
                      Martin J. Lyons
Martin
                      J. Lyons
Vice
                        President and Controller
(Principal Accounting
                        Officer)
ILLINOIS
                          POWER COMPANY
(Registrant)
/s/
                        Martin J. Lyons
Martin
                        J. Lyons
Vice
                          President and Controller
(Principal Accounting
                          Officer)
Date:
      September 27, 2005
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