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      Ameren 8-K, dated Sept. 18, 2006
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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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      of
      report (Date of earliest event reported):</font><a name="ReportDate"/></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">September
                15, 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>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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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            <td align="justify" valign="top" width="26%">
              <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>
            <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"><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>
              <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>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><a name="EIN"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">43-1723446</font></a></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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-3672</font></div>
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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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Central
                Illinois Public Service</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">(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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                Illinois 62739</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">(217)
                523-3600</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-0211380</font></div>
            </td>
          </tr>
          <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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">333-56594</font></div>
            </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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
                Energy Generating</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">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>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-1395586</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">2-95569</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CILCORP
                Inc.</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
                Liberty Street</font></div>
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                Illinois 61602</font></div>
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                677-5271</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-1169387</font></div>
            </td>
          </tr>
          <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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-2732</font></div>
            </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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Central
                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
                Liberty Street</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">Peoria,
                Illinois 61602</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">(309)
                677-5271</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-0211050</font></div>
            </td>
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    <div>&#160;</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="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-3004</font></div>
            </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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Illinois
                Power 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">370
                South Main Street </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">Decatur,
                Illinois 62523</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">(217)
                424-6600</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-0344645</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>
    <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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      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>
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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>
    <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: 9pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[&#160;&#160;]
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
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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"><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">ITEM
        7.01
        Regulation FD Disclosure.</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">On
        September 15, 2006, NERA Economic Consulting issued a press release regarding
        the competitive power procurement auction in Illinois. The press release
        is
        attached as Exhibit 99.1 and is incorporated herein by reference. The
        information furnished pursuant to this Item 7.01, including Exhibit 99.1,
        shall
        not be deemed &#8220;filed&#8221; for purposes of Section 18 of the Securities Exchange Act
        of 1934 (the "Exchange Act") or otherwise subject to the liabilities under
        that
        Section and shall not be deemed to be incorporated by reference into any
        filing
        of the Registrant under the Securities Act of 1933 (the &#8220;Securities Act&#8221;) or the
        Exchange Act. </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"><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: 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">Reference
        is made to Note 2 - Rate and Regulatory Matters to the financial statements
        under Part I, Item 1; Outlook under Part I, Item 2. Management&#8217;s Discussion and
        Analysis of Financial Condition and Results of Operations; and Part II, Item
        1A.
        Risk Factors in the Form 10-Q for the quarterly period ended June 30, 2006,
        of
        registrant Ameren Corporation (&#8220;Ameren&#8221;) and its registrant subsidiaries,
        Central Illinois Public Service Company, doing business as AmerenCIPS (&#8220;CIPS&#8221;),
        Ameren Energy Generating Company, CILCORP Inc., Central Illinois Light Company,
        doing business as AmerenCILCO (&#8220;CILCO&#8221;), and Illinois Power Company, doing
        business as AmerenIP (&#8220;IP&#8221;) (collectively, the &#8220;registrants&#8221;), for a discussion
        of the process for power procurement for Ameren&#8217;s Illinois utility companies
        after the expiration of the current Illinois electric rate freeze on January
        1,
        2007 and power supply contracts on December 31, 2006. Reference is also made
        to
        Supply for Electric Power under Part I, Item 1. Business; Part I, Item 1A.
        Risk
        Factors; Outlook under Part II, Item 7. Management&#8217;s Discussion and Analysis of
        Financial Condition and Results of Operations; Part II, Item 7A. Quantitative
        and Qualitative Disclosures About Market Risk; and Note 3 - Rate and Regulatory
        Matters to the financial statements under Part II, Item 8 in the registrants&#8217;
Annual Report on Form 10-K for the fiscal year ended December 31, 2005, for
        a
        discussion of the process for power procurement for Ameren&#8217;s Illinois utility
        companies after the expiration of the current Illinois electric rate freeze
        on
        January 1, 2007 and power supply contracts on December 31, 2006.</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">On
        September 15, 2006, NERA Economic Consulting declared a successful result
        in the
        competitive power procurement auction in Illinois for fixed-price customers,
        which includes the vast majority of electric customers of CIPS, CILCO and
        IP.
        NERA Economic Consulting served as auction manager for the power procurement
        auction. The auction determined the cost of power that CIPS, CILCO and IP
        will
        purchase on behalf of fixed-price customers for 2007.</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">On
        September 15, 2006, CIPS, CILCO and IP issued a press release discussing
        the
        impact on Illinois residential </font><br></div>
    </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="left">
      </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: 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 size="2">customer
        rates of the competitive power procurement
        auction and potential increases resulting from delivery service cases that
        are
        currently pending before the Illinois Commerce Commission. The press release
        is
        attached as Exhibit&#160;99.2 and is incorporated herein by
        reference.</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: 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="left"><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;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
        <div align="left">
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td align="left" valign="top" width="10%"><u><font size="2">Exhibit
                  Number</font></u>&#160;</td>
                <td align="left" valign="top" width="54%">
                  <div><font size="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Title</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">:</font></font></div>
                  <div>&#160;</div>
                </td>
              </tr>
              <tr>
                <td align="left" valign="top" width="10%">
                  <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">99.1*</font></div>
                </td>
                <td align="left" valign="top" width="54%">
                  <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">Press
                    Release regarding the Illinois competitive power procurement
                    auction,
                    </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">issued
                    on September 15, 2006 by NERA Economic Consulting.</font></div>
                </td>
              </tr>
              <tr>
                <td align="left" valign="top" width="10%">&#160;</td>
                <td align="left" valign="top" width="54%">&#160;</td>
              </tr>
              <tr>
                <td align="left" valign="top" width="10%">
                  <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">99.2</font></div>
                </td>
                <td align="left" valign="top" width="54%">
                  <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">Press
                    release regarding impact of Illinois competitive power procurement
                    </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">auction
                    and potential increases in delivery service rates, issued on
                    September 15,
                    </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">2006
                    by Central Illinois Public Service Company, Central Illinois
                    Light
                    </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">Company
                    and Illinois Power Company.</font></div>
                </td>
              </tr>

          </table>
        </div>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="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">*Exhibit
        99.1 is intended to be furnished rather than filed pursuant to General
        Instruction B.2 of Form 8-K.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">-
        - - - -
        - - - - - - - - - - - - - - - </font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="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">This
        combined Form 8-K is being filed separately by Ameren Corporation, 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="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">FORWARD-LOOKING
        STATEMENTS</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: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Certain
        statements in this report relate to future events and expectations and as
        such
        constitute forward-looking statements involving known and unknown factors
        that
        may cause actual results of the registrants to be different from those expressed
        or implied in the forward-looking statements. In this context, words such
        as
&#8220;expects,&#8221; &#8220;anticipates,&#8221; &#8220;intends,&#8221; &#8220;plans,&#8221; &#8220;believes,&#8221; &#8220;seeks,&#8221; &#8220;will,&#8221; or
        other similar words and phrases often identify forward-looking statements
        made
        on behalf of the registrants. It is important to note that actual results
        of the
        registrants may differ materially from those described or implied in such
        forward-looking statements based on a number of factors and uncertainties,
        including, but not limited to, regulatory actions, including changes in
        regulatory policies and ratemaking determinations; changes in laws and other
        governmental actions, including monetary and fiscal policies; the effects
        of
        increased competition in the future due to, among other things, deregulation
        of
        certain aspects of our business at both the state and federal levels, and
        the
        implementation of deregulation, such as when the current electric rate freeze
        and current power supply contracts expire in Illinois at the end of 2006;
        business and economic conditions, including their impact on interest rates;
        disruptions of the capital markets or other events that make the registrants
        access to necessary capital more difficult or costly; actions of credit rating
        agencies and the effects of such actions; legal and administrative proceedings;
        and other factors described in more detail in the registrants&#8217; filings with the
        Securities and Exchange Commission. We do not undertake to update our
        forward-looking statements.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    </div>
    <div 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><br>
    <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="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: 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 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">AMEREN
      CORPORATION</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>/s/
      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CENTRAL
      ILLINOIS PUBLIC SERVICE COMPANY</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>/s/
      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 4.5pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>/s/
      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 4.5pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CILCORP
      Inc.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 4.5pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CENTRAL
      ILLINOIS LIGHT COMPANY</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>/s/
      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 4.5pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">-4-</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ILLINOIS
      POWER COMPANY</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>/s/
      Martin J.
      Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</u></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 4.5pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Vice
      President and Controller </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 126pt; LINE-HEIGHT: 1.25; 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: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 207pt; 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="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:
      September 18, 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 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">-5-</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div>&#160;</div>
    <div><br>
      <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"><u>Exhibit
        Index</u></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: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
        <table cellpadding="0" cellspacing="0" width="100%">

            <tr>
              <td align="left" valign="top" width="10%"><u><font size="2">Exhibit
                Number</font></u>&#160;</td>
              <td align="left" valign="top" width="54%">
                <div><font size="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Title</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">:</font></font></div>
                <div>&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="10%">
                <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">99.1*</font></div>
              </td>
              <td align="left" valign="top" width="54%">
                <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">Press
                  Release regarding the Illinois competitive power procurement auction,
                  </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">issued
                  on September 15, 2006 by NERA Economic Consulting.</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="10%">&#160;</td>
              <td align="left" valign="top" width="54%">&#160;</td>
            </tr>
            <tr>
              <td align="left" valign="top" width="10%">
                <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">99.2</font></div>
              </td>
              <td align="left" valign="top" width="54%">
                <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">Press
                  release regarding impact of Illinois competitive power procurement
                  </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">auction
                  and potential increases in delivery service rates, issued on September
                  15,
                  </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">2006
                  by Central Illinois Public Service Company, Central Illinois Light
                  </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">Company
                  and Illinois Power Company.</font></div>
              </td>
            </tr>

        </table>
        <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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[{"type": "8-K", "sequence": "1", "filename": "ameren8k09182006.htm", "description": "AMEREN 8-K, DATED SEPT. 18, 2006", "secsgml_size_bytes": 59965}]
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Ameren 8-K, dated Sept. 18, 2006
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
                15, 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
1-3672
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
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)
370
                South Main Street
Decatur,
                Illinois 62523
(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))
ITEM
        7.01
        Regulation FD Disclosure.
On
        September 15, 2006, NERA Economic Consulting issued a press release regarding
        the competitive power procurement auction in Illinois. The press release
        is
        attached as Exhibit 99.1 and is incorporated herein by reference. The
        information furnished pursuant to this Item 7.01, including Exhibit 99.1,
        shall
        not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act
        of 1934 (the "Exchange Act") or otherwise subject to the liabilities under
        that
        Section and shall not be deemed to be incorporated by reference into any
        filing
        of the Registrant under the Securities Act of 1933 (the "Securities Act") or the
        Exchange Act.
ITEM
        8.01
        Other Events.
Reference
        is made to Note 2 - Rate and Regulatory Matters to the financial statements
        under Part I, Item 1; Outlook under Part I, Item 2. Management's Discussion and
        Analysis of Financial Condition and Results of Operations; and Part II, Item
        1A.
        Risk Factors in the Form 10-Q for the quarterly period ended June 30, 2006,
        of
        registrant Ameren Corporation ("Ameren") and its registrant subsidiaries,
        Central Illinois Public Service Company, doing business as AmerenCIPS ("CIPS"),
        Ameren Energy Generating Company, CILCORP Inc., Central Illinois Light Company,
        doing business as AmerenCILCO ("CILCO"), and Illinois Power Company, doing
        business as AmerenIP ("IP") (collectively, the "registrants"), for a discussion
        of the process for power procurement for Ameren's Illinois utility companies
        after the expiration of the current Illinois electric rate freeze on January
        1,
        2007 and power supply contracts on December 31, 2006. Reference is also made
        to
        Supply for Electric Power under Part I, Item 1. Business; Part I, Item 1A.
        Risk
        Factors; Outlook under Part II, Item 7. Management's Discussion and Analysis of
        Financial Condition and Results of Operations; Part II, Item 7A. Quantitative
        and Qualitative Disclosures About Market Risk; and Note 3 - Rate and Regulatory
        Matters to the financial statements under Part II, Item 8 in the registrants'
Annual Report on Form 10-K for the fiscal year ended December 31, 2005, for
        a
        discussion of the process for power procurement for Ameren's Illinois utility
        companies after the expiration of the current Illinois electric rate freeze
        on
        January 1, 2007 and power supply contracts on December 31, 2006.
On
        September 15, 2006, NERA Economic Consulting declared a successful result
        in the
        competitive power procurement auction in Illinois for fixed-price customers,
        which includes the vast majority of electric customers of CIPS, CILCO and
        IP.
        NERA Economic Consulting served as auction manager for the power procurement
        auction. The auction determined the cost of power that CIPS, CILCO and IP
        will
        purchase on behalf of fixed-price customers for 2007.
On
        September 15, 2006, CIPS, CILCO and IP issued a press release discussing
        the
        impact on Illinois residential
-2-
customer
        rates of the competitive power procurement
        auction and potential increases resulting from delivery service cases that
        are
        currently pending before the Illinois Commerce Commission. The press release
        is
        attached as Exhibit 99.2 and is incorporated herein by
        reference.
ITEM
        9.01
        Financial Statements and Exhibits.
(d)
        Exhibits.
Exhibit
                  Number
Title
:
99.1*
Press
                    Release regarding the Illinois competitive power procurement
                    auction,
issued
                    on September 15, 2006 by NERA Economic Consulting.
99.2
Press
                    release regarding impact of Illinois competitive power procurement
auction
                    and potential increases in delivery service rates, issued on
                    September 15,
2006
                    by Central Illinois Public Service Company, Central Illinois
                    Light
Company
                    and Illinois Power Company.
*Exhibit
        99.1 is intended to be furnished rather than filed pursuant to General
        Instruction B.2 of Form 8-K.
-
        - - - -
        - - - - - - - - - - - - - - -
This
        combined Form 8-K is being filed separately by Ameren Corporation, 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.
FORWARD-LOOKING
        STATEMENTS
Certain
        statements in this report relate to future events and expectations and as
        such
        constitute forward-looking statements involving known and unknown factors
        that
        may cause actual results of the registrants to be different from those expressed
        or implied in the forward-looking statements. In this context, words such
        as
"expects," "anticipates," "intends," "plans," "believes," "seeks," "will," or
        other similar words and phrases often identify forward-looking statements
        made
        on behalf of the registrants. It is important to note that actual results
        of the
        registrants may differ materially from those described or implied in such
        forward-looking statements based on a number of factors and uncertainties,
        including, but not limited to, regulatory actions, including changes in
        regulatory policies and ratemaking determinations; changes in laws and other
        governmental actions, including monetary and fiscal policies; the effects
        of
        increased competition in the future due to, among other things, deregulation
        of
        certain aspects of our business at both the state and federal levels, and
        the
        implementation of deregulation, such as when the current electric rate freeze
        and current power supply contracts expire in Illinois at the end of 2006;
        business and economic conditions, including their impact on interest rates;
        disruptions of the capital markets or other events that make the registrants
        access to necessary capital more difficult or costly; actions of credit rating
        agencies and the effects of such actions; legal and administrative proceedings;
        and other factors described in more detail in the registrants' filings with the
        Securities and Exchange Commission. We do not undertake to update our
        forward-looking statements.
-3-
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)
CENTRAL
      ILLINOIS PUBLIC SERVICE COMPANY
(Registrant)
/s/
      Martin J.
      Lyons
Martin
      J.
      Lyons
Vice
      President and Controller
(Principal
      Accounting Officer)
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)
-4-
ILLINOIS
      POWER COMPANY
(Registrant)
/s/
      Martin J.
      Lyons
Martin
      J.
      Lyons
Vice
      President and Controller
(Principal
      Accounting Officer)
Date:
      September 18, 2006
-5-
Exhibit
        Index
Exhibit
                Number
Title
:
99.1*
Press
                  Release regarding the Illinois competitive power procurement auction,
issued
                  on September 15, 2006 by NERA Economic Consulting.
99.2
Press
                  release regarding impact of Illinois competitive power procurement
auction
                  and potential increases in delivery service rates, issued on September
                  15,
2006
                  by Central Illinois Public Service Company, Central Illinois Light
Company
                  and Illinois Power Company.