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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">UNITED
        STATES</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">SECURITIES
        AND EXCHANGE COMMISSION</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Washington,
        D.C.&#160;&#160;20549</font></div>
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              <td valign="top" width="24%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">&#160;
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">FORM
                  8-K</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="24%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">&#160;</font></td>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">CURRENT
        REPORT</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Pursuant
        to Section 13 or 15(d) of the</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Securities
        Exchange Act of 1934</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Date
        of
        report (Date of earliest event reported):<a name="ReportDate"/></font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">November
                  2, 2007</font></div>
              </td>
            </tr>

        </table>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><a name="Registrant"><br></a></div>
      <div align="center">
        <table cellpadding="0" cellspacing="0" width="86%">

            <tr>
              <td align="justify" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><u>Commission
                  File Number</u></font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Exact
                  Name of Registrant as </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Specified
                  in Charter;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">State
                  of Incorporation;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><u>Address
                  and Telephone Number</u></font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">IRS
                  Employer</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><u>Identification
                  Number</u></font></div>
              </td>
            </tr>
            <tr>
              <td align="justify" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><a name="jurisdiction">1-14756</a></font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><a name="cfn">Ameren
                  Corporation</a></font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Missouri
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">1901
                  Chouteau Avenue</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">St.
                  Louis, Missouri 63103</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(314)
                  621-3222</font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;"><a name="ein">43-1723446</a></font></div>
              </td>
            </tr>
            <tr>
              <td align="justify" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">1-3672</font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Central
                  Illinois Public Service </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Illinois
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">607
                  East Adams Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Springfield,
                  Illinois 62739</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(888)
                  789-2477</font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">37-0211380</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">2-95569</font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">CILCORP
                  Inc.</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Illinois
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">300
                  Liberty Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Peoria,
                  Illinois 61602</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(309)
                  677-5271</font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">37-1169387</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">1-2732</font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Central
                  Illinois Light Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Illinois
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">300
                  Liberty Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Peoria,
                  Illinois 61602</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(309)
                  677-5271</font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">37-0211050</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">1-3004</font></div>
              </td>
              <td align="left" valign="top" width="26%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Illinois
                  Power Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Illinois
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">370
                  South Main Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Decatur,
                  Illinois 62523</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(217)
                  424-6600</font></div>
                <div>&#160;</div>
              </td>
              <td align="justify" valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">37-0344645</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div>&#160;</div>
      <div>&#160;</div>
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          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Check
            the
            appropriate box below if the Form 8-K filing is intended to simultaneously
            satisfy the filing obligation of the registrants under any of the following
            provisions:</font></div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><font id="TAB1" style="MARGIN-LEFT: 13.5pt;"></font>[&#160;&#160;]
            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; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><font id="TAB1" style="MARGIN-LEFT: 13.5pt;"></font>[&#160;&#160;]
            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; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><font id="TAB1" style="MARGIN-LEFT: 13.5pt;"></font>[&#160;&#160;]
            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; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><font id="TAB1" style="MARGIN-LEFT: 13.5pt;"></font>[&#160;&#160;]
            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; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><strong>ITEM
              8.01&#160;&#160;Other Events.</strong></font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">On
              November 2, 2007, Central Illinois Public Service Company, doing business
              as
              AmerenCIPS (&#8220;CIPS&#8221;), 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;Ameren Illinois Utilities&#8221;), filed requests with the
              Illinois Commerce Commission (&#8220;ICC&#8221;) seeking approval to increase their electric
              delivery service rates.&#160;&#160;CIPS, CILCO and IP requested to increase
              their annual revenues from electric delivery service by $31 million,
              $10 million
              and $139 million, respectively.&#160;&#160;The Ameren Illinois Utilities pledged
              earlier this year to keep the overall residential electric bill increases
              to
              less than 10 percent per year for each utility in their next rate
              filings.&#160;&#160;These filings are consistent with that
              pledge.&#160;&#160;Accordingly,&#160;the requested rate increase for IP
              residential customers is proposed to be capped in the first year of
              the increase
              if the amount of the final authorized rate increase exceeds the first
              year
              capped rate level.&#160;&#160;This rate increase limit could result in
              approximately $30 million of the requested increase not being phased
              in until
              the second year.&#160;&#160;The amount of CIPS&#8217; and CILCO&#8217;s requested increases
              did not require inclusion of similar limits as they were within the
              scope of the
              pledge.&#160;&#160;The electric rate increase requests are based on an
              11&#160;percent return on equity, a capital structure composed of 51 to 53
              percent equity, an aggregate rate base for the Ameren Illinois Utilities
              of $2.1
              billion, and a test year ended December 31, 2006.</font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Also
              on
              November 2, 2007, CIPS, CILCO and IP filed requests with the ICC seeking
              approval to change their natural gas delivery service rates.&#160;&#160;CIPS and
              IP requested to increase their annual revenues from natural gas delivery
              service
              by $15 million and $56 million, respectively.&#160;&#160;CILCO requested to
              decrease its annual revenues from natural gas delivery service by $4
              million.&#160;&#160;The natural gas rate change requests are based on an 11
              percent return on equity, a capital structure composed of 51 to 53
              percent
              equity, an aggregate rate base for the Ameren Illinois Utilities of
              $0.9 billion
              and a test year ended December 31, 2006.</font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">In
              their
              filings, the Ameren Illinois Utilities have also requested ICC approval
              to
              implement mechanisms that would permit the reconciliation and adjustment
              of
              actual bad debt expenses to those established in rates by the ICC for
              electric
              and gas customers and the more timely recovery of investments in existing
              electric distribution plant.&#160;&#160;Since general rate adjustment
              proceedings require up to 11 months in Illinois, these mechanisms would
              allow
              current revenues to better match current costs.&#160;&#160;In addition, the
              Ameren Illinois Utilities are seeking approval of a revenue decoupling
              rate
              adjustment mechanism as a part of their natural gas delivery service
              rate change
              requests.&#160;&#160;This mechanism would separate each utility&#8217;s fixed cost
              recovery from the volume of gas it sells by providing a periodic true-up
              of
              revenues.&#160;&#160;The periodic true-up would result in adjustments to a
              utility&#8217;s ICC-approved tariffs based on increases or decreases in demand for
              natural gas.</font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">The
              ICC
              proceedings relating to the proposed electric and natural gas delivery
              service
              rate changes will take place over a period of up to 11 months and decisions
              by
              the ICC in such proceedings are required by October 2008.&#160;&#160;The Ameren
              Illinois Utilities cannot predict the level of any delivery service
              rate change
              the ICC may approve, when any rate change may go into effect, whether
              any rate
              adjustment mechanism discussed above will be approved or whether any
              rate
              increase that may eventually be approved will be sufficient for the
              Ameren
              Illinois Utilities to recover their costs and earn a reasonable return
              on their
              investments when the increase goes into effect.&#160;&#160;Attached as Exhibit
              99.1 and incorporated herein by reference is the Ameren Illinois Utilities&#8217;
press release regarding their filings with the ICC.</font></div>
            <div><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">
                </div>
                <div style="WIDTH: 100%; TEXT-ALIGN: center">
                  <hr style="COLOR: black" noshade size="2">
                </div>
              </div>
              <div id="HDR">
                <div id="GLHDR" style="WIDTH: 100%" align="right">
                </div>
              </div>
            </div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><strong>ITEM
              9.01&#160;&#160;Financial Statements and Exhibits.</strong></font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(d)&#160;&#160;Exhibits</font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><u>Exhibit
              Number</u>:&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
<u>Title</u>:</font></div>
            <div><br></div>
            <div>
              <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

                  <tr valign="top">
                    <td style="WIDTH: 108pt">
                      <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">99.1</font></div>
                    </td>
                    <td>
                      <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Press
                        release regarding electric and natural gas delivery service
                        rate change
                        filings, </font></div>
                      <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">issued&#160;on
                        November 2, 2007 by CIPS, CILCO and
                        IP.</font></div>
                    </td>
                  </tr>

              </table>
            </div>
            <div><br></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">-
              - - - -
              - - - - - - - - - - - - - - -</font></div>
            <div><br></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">This
              combined Form 8-K is being filed separately by Ameren, CIPS, CILCORP,
              CILCO and
              IP.&#160;&#160;Information contained herein relating to any individual
              registrant has been filed by such registrant on its own behalf.&#160;&#160;No
              registrant makes any representation as to information relating to any
              other
              registrant.</font></div>
            <div><br></div>
          </div>
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman;">-3-</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
        </div>
      </div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">SIGNATURES</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="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.&#160;&#160;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; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</u>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Martin
        J.
        Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Principal
        Accounting Officer)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</u>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Martin
        J.
        Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Principal
        Accounting Officer)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Martin
        J.
        Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Principal
        Accounting Officer)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</u>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Martin
        J.
        Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Principal
        Accounting Officer)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</u>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Martin
        J.
        Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 288pt; 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: 0pt; TEXT-INDENT: 288pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Principal
        Accounting Officer)</font></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Date:&#160;&#160;November
        2, 2007</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 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: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Exhibit
        Index</font></div>
      <div><br></div>
      <div><br></div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;"><u>Exhibit
        Number</u>:&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<u>Title</u>:</font></div>
      <div><br></div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

            <tr valign="top">
              <td style="WIDTH: 108pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">99.1</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Press
                  release regarding electric and natural gas delivery service rate
                  change
                  filings, </font></div>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">issued&#160;on
                  November 2, 2007 by CIPS, CILCO and
                  IP.</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman;">-5-</font></div>
    </div>
  </body>
</html>
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ameren8k110207.htm
UNITED
        STATES
SECURITIES
        AND EXCHANGE COMMISSION
Washington,
        D.C.  20549
FORM
                  8-K
CURRENT
        REPORT
Pursuant
        to Section 13 or 15(d) of the
Securities
        Exchange Act of 1934
Date
        of
        report (Date of earliest event reported):
November
                  2, 2007
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
(888)
                  789-2477
37-0211380
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 registrants 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
              8.01  Other Events.
On
              November 2, 2007, Central Illinois Public Service Company, doing business
              as
              AmerenCIPS ("CIPS"), Central Illinois Light Company, doing business as
              AmerenCILCO ("CILCO"), and Illinois Power Company, doing business as AmerenIP
              ("IP") (collectively, the "Ameren Illinois Utilities"), filed requests with the
              Illinois Commerce Commission ("ICC") seeking approval to increase their electric
              delivery service rates.  CIPS, CILCO and IP requested to increase
              their annual revenues from electric delivery service by $31 million,
              $10 million
              and $139 million, respectively.  The Ameren Illinois Utilities pledged
              earlier this year to keep the overall residential electric bill increases
              to
              less than 10 percent per year for each utility in their next rate
              filings.  These filings are consistent with that
              pledge.  Accordingly, the requested rate increase for IP
              residential customers is proposed to be capped in the first year of
              the increase
              if the amount of the final authorized rate increase exceeds the first
              year
              capped rate level.  This rate increase limit could result in
              approximately $30 million of the requested increase not being phased
              in until
              the second year.  The amount of CIPS' and CILCO's requested increases
              did not require inclusion of similar limits as they were within the
              scope of the
              pledge.  The electric rate increase requests are based on an
              11 percent return on equity, a capital structure composed of 51 to 53
              percent equity, an aggregate rate base for the Ameren Illinois Utilities
              of $2.1
              billion, and a test year ended December 31, 2006.
Also
              on
              November 2, 2007, CIPS, CILCO and IP filed requests with the ICC seeking
              approval to change their natural gas delivery service rates.  CIPS and
              IP requested to increase their annual revenues from natural gas delivery
              service
              by $15 million and $56 million, respectively.  CILCO requested to
              decrease its annual revenues from natural gas delivery service by $4
              million.  The natural gas rate change requests are based on an 11
              percent return on equity, a capital structure composed of 51 to 53
              percent
              equity, an aggregate rate base for the Ameren Illinois Utilities of
              $0.9 billion
              and a test year ended December 31, 2006.
In
              their
              filings, the Ameren Illinois Utilities have also requested ICC approval
              to
              implement mechanisms that would permit the reconciliation and adjustment
              of
              actual bad debt expenses to those established in rates by the ICC for
              electric
              and gas customers and the more timely recovery of investments in existing
              electric distribution plant.  Since general rate adjustment
              proceedings require up to 11 months in Illinois, these mechanisms would
              allow
              current revenues to better match current costs.  In addition, the
              Ameren Illinois Utilities are seeking approval of a revenue decoupling
              rate
              adjustment mechanism as a part of their natural gas delivery service
              rate change
              requests.  This mechanism would separate each utility's fixed cost
              recovery from the volume of gas it sells by providing a periodic true-up
              of
              revenues.  The periodic true-up would result in adjustments to a
              utility's ICC-approved tariffs based on increases or decreases in demand for
              natural gas.
The
              ICC
              proceedings relating to the proposed electric and natural gas delivery
              service
              rate changes will take place over a period of up to 11 months and decisions
              by
              the ICC in such proceedings are required by October 2008.  The Ameren
              Illinois Utilities cannot predict the level of any delivery service
              rate change
              the ICC may approve, when any rate change may go into effect, whether
              any rate
              adjustment mechanism discussed above will be approved or whether any
              rate
              increase that may eventually be approved will be sufficient for the
              Ameren
              Illinois Utilities to recover their costs and earn a reasonable return
              on their
              investments when the increase goes into effect.  Attached as Exhibit
              99.1 and incorporated herein by reference is the Ameren Illinois Utilities'
press release regarding their filings with the ICC.
ITEM
              9.01  Financial Statements and Exhibits.
(d)  Exhibits
Exhibit
              Number
:
Title
:
99.1
Press
                        release regarding electric and natural gas delivery service
                        rate change
                        filings,
issued on
                        November 2, 2007 by CIPS, CILCO and
                        IP.
-
              - - - -
              - - - - - - - - - - - - - - -
This
              combined Form 8-K is being filed separately by Ameren, CIPS, CILCORP,
              CILCO and
              IP.  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.
-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)
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:  November
        2, 2007
-4-
Exhibit
        Index
Exhibit
        Number
:
Title
:
99.1
Press
                  release regarding electric and natural gas delivery service rate
                  change
                  filings,
issued on
                  November 2, 2007 by CIPS, CILCO and
                  IP.
-5-