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      Ameren Form 8-K 7-14-2005
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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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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">FORM
                8-K</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT
      REPORT</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to Section 13 or 15(d) of the Securities Exchange Act of 1934</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
      of
      Report (Date of earliest event reported):</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><a name="ReportDate"/></div>
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              <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">July
                14, 2005</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Commission
                  File Number</u></font></div>
              </td>
              <td align="left" valign="top" width="26%" style="BORDER-BOTTOM: #ffffff thin solid">
                <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: #ffffff thin solid">
                <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>
            </tr>
            <tr>
              <td align="justify" colspan="2" 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>
            </tr>
            <tr>
              <td align="left" colspan="2" 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">1-2967</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">Union
                  Electric 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">(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="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">43-0559760</font></div>
              </td>
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              <td align="left" colspan="2" 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>
              </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 Public Service Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Illinois
                  Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">607
                  East Adams Street</font></div>
                <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">Springfield,
                  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>
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              <td align="left" colspan="2" 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 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>
            <tr>
              <td align="left" colspan="2" 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>
              <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">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>
                <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">37-1169387</font></div>
              </td>
            </tr>

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      <div>&#160;</div>
      <div>&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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      </div>
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        <table cellpadding="0" cellspacing="0" width="100%">

            <tr>
              <td align="left" colspan="2" 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>
            </tr>
            <tr>
              <td align="left" colspan="2" 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">1-3004</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">500
                  South 27th 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 62521</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>
              </td>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><a name="Address"/><a name="Zip"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:</font></a></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 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">[
      ]
      Written communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 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">[
      ]
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 9pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: -4.5pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[
      ]
      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 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">[
      ]
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br>&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECTION
      1
      - REGISTRANT&#8217;S BUSINESS AND OPERATIONS</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      1.01
      Entry into a Material Definitive Agreement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      July
      14, 2005, Ameren Corporation (&#8220;Ameren&#8221;) and its subsidiaries, Union Electric
      Company, doing business as AmerenUE (&#8220;UE&#8221;), Central Illinois Public Service
      Company, doing business as AmerenCIPS (&#8220;CIPS&#8221;), Central Illinois Light Company,
      doing business as AmerenCILCO (&#8220;CILCO&#8221;), Ameren Energy Generating Company
      (&#8220;Genco&#8221;) and Illinois Power Company, doing business as AmerenIP (&#8220;IP&#8221;),
      (collectively, the &#8220;Ameren Companies&#8221;), as borrowers, entered into a revolving
      credit agreement with various lenders from time to time parties to the
      agreement, initially including among others, JPMorgan Chase Bank, N.A. and
      Barclays Bank PLC, and JPMorgan Chase Bank, N.A., as administrative agent (the
      &#8220;Ameren Companies July 2005 Revolving Credit Agreement&#8221;). A brief description of
      the terms and conditions of the Ameren Companies July 2005 Revolving Credit
      Agreement is included under Item 2.03 below and the text of the agreement is
      included as Exhibit 10.1. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Also
      on
      July 14, 2005, Ameren, as borrower, entered into an amended and restated credit
      agreement which amends and restates its $350 million five-year revolving credit
      agreement dated as of July 14, 2004 with various lenders from time to time
      parties to the agreement, including among others, the lenders and administrative
      agent which are identified above as parties to the Ameren Companies July 2005
      Revolving Credit Agreement (the &#8220;Ameren July 2005 Amended and Restated Revolving
      Credit Agreement&#8221;). A brief description of the terms and conditions of the
      Ameren July 2005 Amended and Restated Revolving Credit Agreement is included
      under Item 2.03 below and the text of the amended and restated agreement is
      included as Exhibit 10.2. A copy of the July 14, 2004 revolving credit agreement
      which has been amended and restated was filed as Exhibit 10.2 to Ameren&#8217;s
      combined Form 10-Q for the quarterly period ended June 30, 2004. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      1.02
      Termination of a Material Definition Agreement. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Upon
      execution of and pursuant to the provisions of the Ameren Companies July 2005
      Revolving Credit Agreement, the following Ameren credit agreements and the
      lenders commitments thereunder were terminated without any early termination
      penalties incurred by Ameren: </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"><br>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">-
          2
          -</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
      <div>&#160;</div>
    </div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="LINE-HEIGHT: 1.25">
            <td align="right" style="WIDTH: 36pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
                $235 million amended and restated three-year revolving credit agreement
                dated as of September 21, 2004 with various lenders from time to
                time
                parties to the agreement, including among others, the lenders and
                administrative agent which are identified in Item 1.01 above as parties
                to
                the Ameren Companies July 2005 Revolving Credit Agreement (filed
                as
                Exhibit 10.1 to Ameren&#8217;s combined Form 8-K dated September&#160;21,
                2004).</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 18pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table cellpadding="0" cellspacing="0" id="list" width="100%">

          <tr valign="top" style="LINE-HEIGHT: 1.25">
            <td align="right" style="WIDTH: 36pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Symbol, serif">&#183;&#160;&#160;</font></td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
                $350 million three-year revolving credit agreement dated as of July
                14,
                2004 with various lenders from time to time parties to the agreement,
                including among others, the lenders and administrative agent which
                are
                identified in Item 1.01 above as parties to the Ameren Companies
                July 2005
                Revolving Credit Agreement (filed as Exhibit 10.1 to Ameren&#8217;s combined
                Form 10-Q for the quarterly period ended June 30,
                2004).</font></div>
            </td>
          </tr>

      </table>
    </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">SECTION
      2
      - FINANCIAL INFORMATION </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      2.03
      Creation of a Direct Financial Obligation or an Obligation under an Off-Balance
      Sheet Arrangement of a Registrant.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Ameren Companies July 2005 Revolving Credit Agreement (Exhibit 10.1 hereto)
      is a
      five-year revolving credit facility which provides for loans to and letters
      of
      credit issued for the accounts of the Ameren Companies in an amount up to $1.150
      billion. The entire amount of the facility is available to Ameren. The sum
      of
      the outstanding loans made to and letters of credit issued for the account
      of
      any of the other Ameren Companies (other than UE) under the facility may not
      at
      any time exceed $150 million. The sum of the outstanding loans made to and
      letters of credit issued for the account of UE under the facility may not at
      any
      time exceed $500 million. Three forms of loans are available under the Ameren
      Companies July 2005 Revolving Credit Agreement: revolving loans provided by
      the
      lenders on a committed basis, competitive loans provided on an uncommitted
      basis
      through an auction mechanism and swingline loans provided by JPMorgan Chase
      Bank, N.A. on behalf of all lenders in an amount outstanding at any time not
      in
      excess of $100 million. At the option of each of the Ameren Companies, the
      interest rates applicable under the facility are ABR plus the margin applicable
      to the particular borrowing Ameren Company and Eurodollar rate plus the margin
      applicable to the particular borrowing Ameren Company. ABR is a fluctuating
      interest rate equal to the higher of JPMorgan Chase Bank, N.A.&#8217;s prime rate and
      the sum of the federal funds effective rate plus 1/2 percent per annum. The
      Eurodollar interest rate is the applicable British Bankers&#8217; Association London
      interbank offered rate for deposits in U. S. dollars. </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">The
      lenders&#8217; commitments under the Ameren Companies July 2005 Revolving Credit
      Agreement will expire as to Ameren and borrowings by Ameren will mature on
      July
      14, 2010. UE, CIPS, CILCO, Genco and IP are permitted to borrow and obtain
      letters of credit under the facility during the period of 364 days commencing
      on
</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">July
      14,
      2005 and borrowings by these Ameren Companies will mature at the end of the
      364
      days. At the request of Ameren, the final maturity of the facility may be
      extended as to each consenting lender on any of the first four anniversaries
      of
      the July 14, 2005 closing date. Any of the other Ameren Companies may request
      364 day extensions of the maturity of the facility as it applies to that
      company. The principal amount of each revolving loan will be due and payable
      no
      later than the final maturity of the facility in the case of Ameren and the
      last
      day of the 364 day period in the case of UE, CIPS, CILCO, Genco and IP. The
      principal amount of each competitive loan will be due and payable at the end
      of
      the interest period applicable to it, which shall not be later then the final
      maturity date of the facility. Swingline loans will mature five business days
      after they are made and will be made on same-day notice.</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">The
      Ameren Companies July 2005 Revolving Credit Agreement contains conditions to
      borrowings and issuance of letters of credit similar to those in Ameren&#8217;s
      terminated 2004 credit agreements discussed under Item 1.02 above, including
      absence of default or unmatured default, accuracy of representations (other
      than
      representations as to absence of material adverse change and material
      litigation) and warranties and required regulatory authorizations. The facility
      also contains non-financial covenants similar to those in Ameren&#8217;s terminated
      2004 credit agreements including restrictions on the ability to incur liens,
      dispose of assets and merge with other entities. It contains a financial
      covenant that limits each of the Ameren Companies&#8217; (except CILCO&#8217;s) total
      indebtedness to 65 percent of total capitalization pursuant to a defined
      calculation. CILCO&#8217;s total indebtedness is limited to 60 percent of total
      capitalization. In addition, the Ameren Companies July 2005 Revolving Credit
      Agreement contains default provisions similar to those in Ameren&#8217;s terminated
      2004 credit agreements, including a cross default to the </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; HEIGHT: 13px; 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>&#160;</div>
    </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">occurrence
      of an event of default under any other agreement covering indebtedness of Ameren
      and its subsidiaries (other than project finance subsidiaries) and each of
      the
      other Ameren Companies in excess of $50 million in the aggregate. The obligation
      of the Ameren Companies under this facility are several and not joint, and
      except under limited circumstances, the obligations of UE, CIPS, CILCO, Genco
      and IP are not guaranteed by Ameren or any other subsidiary.</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">In
      addition to Ameren&#8217;s 2004 credit agreements discussed under Item 1.02 above, the
      Ameren Companies July 2005 Revolving Credit Agreement will replace UE&#8217;s
      bilateral credit agreements in an aggregate amount of $153.5 million, CIPS&#8217;
      bilateral credit agreements in an aggregate amount of $15 million, CILCO&#8217;s
      bilateral credit agreements in an aggregate amount of $60 million and a
      bilateral credit agreement of Electric Energy, Inc. (an 80 percent-owned
      subsidiary of Ameren) in the amount of $25 million. The Ameren Companies will
      use the proceeds of any borrowings under this facility to repay any amounts
      outstanding under these terminated or replaced credit agreements and for general
      corporate purposes, including for working capital, commercial paper liquidity
      support and to fund loans under the Ameren Companies money pool
      arrangements.</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">The
      Ameren July 2005 Amended and Restated Revolving Credit Agreement (Exhibit 10.2
      hereto) revises the July 2004 $350 million five-year credit facility by
      extending the maturity to July 14, 2010, making the entire amount of commitments
      available in the form of letters of credit as well as loans, and to conform,
      as
      applicable, the affirmative and negative covenants, events of default and
      representations and warranties to the Ameren Companies July 2005 Revolving
      Credit Agreement. </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">SECTION
      9
      - FINANCIALS STATEMENTS AND EXHIBITS</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      9.01
      Financial Statements and Exhibits.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)
      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="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"><u>Exhibit
      Number</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">:</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 34.2pt">&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font></font><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></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">10.1<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Five-Year
      Revolving Credit Agreement, dated as of July 14, 2005</font></div>
    <div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.3; MARGIN-RIGHT: 0pt" align="left">
        <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">10.2<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Amended
          and Restated Five-Year Revolving Credit Agreement, dated as of July 14,
          2005</font></div>
      </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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      combined Form 8-K is being filed separately by Ameren Corporation, Union
      Electric Company, Central Illinois Public Service Company, Ameren Energy
      Generating Company, CILCORP Inc., Central Illinois Light Company and Illinois
      Power Company (each a &#8220;registrant&#8221;). Information contained herein relating to
      any individual registrant has been filed by such registrant on its own behalf.
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      registrant.</font></div>
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        to the requirements of the Securities Exchange Act of 1934, each registrant
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        duly authorized. The signature for each undersigned company shall be deemed
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      Martin J. Lyons</font></div>
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      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">---------------------------------------</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
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    <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
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      Martin J. Lyons</font></div>
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          5
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    <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</font></div>
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    <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</font></div>
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    <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"><br></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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    <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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      July 15, 2005</font></div>
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      6
      -</font></div>
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Ameren Form 8-K 7-14-2005
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):
July
                14, 2005
Commission
                  File Number
Exact
                  Name of Registrant as Specified in Charter;
State
                  of Incorporation;
Address
                  and Telephone Number
IRS
                  Employer
Identification
                  Number
1-14756
Ameren
                  Corporation
(Missouri
                  Corporation)
1901
                  Chouteau Avenue
St.
                  Louis, Missouri 63103
(314)
                  621-3222
43-1723446
1-2967
Union
                  Electric Company
(Missouri
                  Corporation)
1901
                  Chouteau Avenue
St.
                  Louis, Missouri 63103
(314)
                  621-3222
43-0559760
1-3672
Central
                  Illinois Public Service Company
(Illinois
                  Corporation)
607
                  East Adams Street
Springfield,
                  Illinois 62739
(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)
500
                  South 27th Street
Decatur,
                  Illinois 62521
(217)
                  424-6600
37-0344645
Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:
[
      ]
      Written communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
[
      ]
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
[
      ]
      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))
[
      ]
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))
SECTION
      1
      - REGISTRANT'S BUSINESS AND OPERATIONS
ITEM
      1.01
      Entry into a Material Definitive Agreement.
On
      July
      14, 2005, Ameren Corporation ("Ameren") and its subsidiaries, Union Electric
      Company, doing business as AmerenUE ("UE"), Central Illinois Public Service
      Company, doing business as AmerenCIPS ("CIPS"), Central Illinois Light Company,
      doing business as AmerenCILCO ("CILCO"), Ameren Energy Generating Company
      ("Genco") and Illinois Power Company, doing business as AmerenIP ("IP"),
      (collectively, the "Ameren Companies"), as borrowers, entered into a revolving
      credit agreement with various lenders from time to time parties to the
      agreement, initially including among others, JPMorgan Chase Bank, N.A. and
      Barclays Bank PLC, and JPMorgan Chase Bank, N.A., as administrative agent (the
      "Ameren Companies July 2005 Revolving Credit Agreement"). A brief description of
      the terms and conditions of the Ameren Companies July 2005 Revolving Credit
      Agreement is included under Item 2.03 below and the text of the agreement is
      included as Exhibit 10.1.
Also
      on
      July 14, 2005, Ameren, as borrower, entered into an amended and restated credit
      agreement which amends and restates its $350 million five-year revolving credit
      agreement dated as of July 14, 2004 with various lenders from time to time
      parties to the agreement, including among others, the lenders and administrative
      agent which are identified above as parties to the Ameren Companies July 2005
      Revolving Credit Agreement (the "Ameren July 2005 Amended and Restated Revolving
      Credit Agreement"). A brief description of the terms and conditions of the
      Ameren July 2005 Amended and Restated Revolving Credit Agreement is included
      under Item 2.03 below and the text of the amended and restated agreement is
      included as Exhibit 10.2. A copy of the July 14, 2004 revolving credit agreement
      which has been amended and restated was filed as Exhibit 10.2 to Ameren's
      combined Form 10-Q for the quarterly period ended June 30, 2004.
ITEM
      1.02
      Termination of a Material Definition Agreement.
Upon
      execution of and pursuant to the provisions of the Ameren Companies July 2005
      Revolving Credit Agreement, the following Ameren credit agreements and the
      lenders commitments thereunder were terminated without any early termination
      penalties incurred by Ameren:
-
          2
          -
·
The
                $235 million amended and restated three-year revolving credit agreement
                dated as of September 21, 2004 with various lenders from time to
                time
                parties to the agreement, including among others, the lenders and
                administrative agent which are identified in Item 1.01 above as parties
                to
                the Ameren Companies July 2005 Revolving Credit Agreement (filed
                as
                Exhibit 10.1 to Ameren's combined Form 8-K dated September 21,
                2004).
·
The
                $350 million three-year revolving credit agreement dated as of July
                14,
                2004 with various lenders from time to time parties to the agreement,
                including among others, the lenders and administrative agent which
                are
                identified in Item 1.01 above as parties to the Ameren Companies
                July 2005
                Revolving Credit Agreement (filed as Exhibit 10.1 to Ameren's combined
                Form 10-Q for the quarterly period ended June 30,
                2004).
SECTION
      2
      - FINANCIAL INFORMATION
ITEM
      2.03
      Creation of a Direct Financial Obligation or an Obligation under an Off-Balance
      Sheet Arrangement of a Registrant.
The
      Ameren Companies July 2005 Revolving Credit Agreement (Exhibit 10.1 hereto)
      is a
      five-year revolving credit facility which provides for loans to and letters
      of
      credit issued for the accounts of the Ameren Companies in an amount up to $1.150
      billion. The entire amount of the facility is available to Ameren. The sum
      of
      the outstanding loans made to and letters of credit issued for the account
      of
      any of the other Ameren Companies (other than UE) under the facility may not
      at
      any time exceed $150 million. The sum of the outstanding loans made to and
      letters of credit issued for the account of UE under the facility may not at
      any
      time exceed $500 million. Three forms of loans are available under the Ameren
      Companies July 2005 Revolving Credit Agreement: revolving loans provided by
      the
      lenders on a committed basis, competitive loans provided on an uncommitted
      basis
      through an auction mechanism and swingline loans provided by JPMorgan Chase
      Bank, N.A. on behalf of all lenders in an amount outstanding at any time not
      in
      excess of $100 million. At the option of each of the Ameren Companies, the
      interest rates applicable under the facility are ABR plus the margin applicable
      to the particular borrowing Ameren Company and Eurodollar rate plus the margin
      applicable to the particular borrowing Ameren Company. ABR is a fluctuating
      interest rate equal to the higher of JPMorgan Chase Bank, N.A.'s prime rate and
      the sum of the federal funds effective rate plus 1/2 percent per annum. The
      Eurodollar interest rate is the applicable British Bankers' Association London
      interbank offered rate for deposits in U. S. dollars.
The
      lenders' commitments under the Ameren Companies July 2005 Revolving Credit
      Agreement will expire as to Ameren and borrowings by Ameren will mature on
      July
      14, 2010. UE, CIPS, CILCO, Genco and IP are permitted to borrow and obtain
      letters of credit under the facility during the period of 364 days commencing
      on
July
      14,
      2005 and borrowings by these Ameren Companies will mature at the end of the
      364
      days. At the request of Ameren, the final maturity of the facility may be
      extended as to each consenting lender on any of the first four anniversaries
      of
      the July 14, 2005 closing date. Any of the other Ameren Companies may request
      364 day extensions of the maturity of the facility as it applies to that
      company. The principal amount of each revolving loan will be due and payable
      no
      later than the final maturity of the facility in the case of Ameren and the
      last
      day of the 364 day period in the case of UE, CIPS, CILCO, Genco and IP. The
      principal amount of each competitive loan will be due and payable at the end
      of
      the interest period applicable to it, which shall not be later then the final
      maturity date of the facility. Swingline loans will mature five business days
      after they are made and will be made on same-day notice.
The
      Ameren Companies July 2005 Revolving Credit Agreement contains conditions to
      borrowings and issuance of letters of credit similar to those in Ameren's
      terminated 2004 credit agreements discussed under Item 1.02 above, including
      absence of default or unmatured default, accuracy of representations (other
      than
      representations as to absence of material adverse change and material
      litigation) and warranties and required regulatory authorizations. The facility
      also contains non-financial covenants similar to those in Ameren's terminated
      2004 credit agreements including restrictions on the ability to incur liens,
      dispose of assets and merge with other entities. It contains a financial
      covenant that limits each of the Ameren Companies' (except CILCO's) total
      indebtedness to 65 percent of total capitalization pursuant to a defined
      calculation. CILCO's total indebtedness is limited to 60 percent of total
      capitalization. In addition, the Ameren Companies July 2005 Revolving Credit
      Agreement contains default provisions similar to those in Ameren's terminated
      2004 credit agreements, including a cross default to the
-
          3
          -
occurrence
      of an event of default under any other agreement covering indebtedness of Ameren
      and its subsidiaries (other than project finance subsidiaries) and each of
      the
      other Ameren Companies in excess of $50 million in the aggregate. The obligation
      of the Ameren Companies under this facility are several and not joint, and
      except under limited circumstances, the obligations of UE, CIPS, CILCO, Genco
      and IP are not guaranteed by Ameren or any other subsidiary.
In
      addition to Ameren's 2004 credit agreements discussed under Item 1.02 above, the
      Ameren Companies July 2005 Revolving Credit Agreement will replace UE's
      bilateral credit agreements in an aggregate amount of $153.5 million, CIPS'
      bilateral credit agreements in an aggregate amount of $15 million, CILCO's
      bilateral credit agreements in an aggregate amount of $60 million and a
      bilateral credit agreement of Electric Energy, Inc. (an 80 percent-owned
      subsidiary of Ameren) in the amount of $25 million. The Ameren Companies will
      use the proceeds of any borrowings under this facility to repay any amounts
      outstanding under these terminated or replaced credit agreements and for general
      corporate purposes, including for working capital, commercial paper liquidity
      support and to fund loans under the Ameren Companies money pool
      arrangements.
The
      Ameren July 2005 Amended and Restated Revolving Credit Agreement (Exhibit 10.2
      hereto) revises the July 2004 $350 million five-year credit facility by
      extending the maturity to July 14, 2010, making the entire amount of commitments
      available in the form of letters of credit as well as loans, and to conform,
      as
      applicable, the affirmative and negative covenants, events of default and
      representations and warranties to the Ameren Companies July 2005 Revolving
      Credit Agreement.
SECTION
      9
      - FINANCIALS STATEMENTS AND EXHIBITS
ITEM
      9.01
      Financial Statements and Exhibits.
(c)
      Exhibits
Exhibit
      Number
:
Title
:
10.1
Five-Year
      Revolving Credit Agreement, dated as of July 14, 2005
10.2
Amended
          and Restated Five-Year Revolving Credit Agreement, dated as of July 14,
          2005
This
      combined Form 8-K is being filed separately by Ameren Corporation, Union
      Electric Company, Central Illinois Public Service Company, Ameren Energy
      Generating Company, CILCORP Inc., Central Illinois Light Company and Illinois
      Power Company (each a "registrant"). Information contained herein relating to
      any individual registrant has been filed by such registrant on its own behalf.
      No registrant makes any representation as to information relating to any other
      registrant.
-
            4 -
SIGNATURES
Pursuant
        to the requirements of the Securities Exchange Act of 1934, each registrant
        has
        duly caused this report to be signed on its behalf by the undersigned hereunto
        duly authorized. The signature for each undersigned company shall be deemed
        to
        relate only to matters having reference to such company or its
        subsidiaries.
AMEREN
      CORPORATION
(Registrant)
/s/
      Martin J. Lyons
---------------------------------------
Martin
      J.
      Lyons
Vice
      President and Controller
(Principal
      Accounting Officer)
UNION
      ELECTRIC COMPANY
(Registrant)
/s/
      Martin J. Lyons
---------------------------------------
Martin
      J.
      Lyons
Vice
      President and Controller
(Principal
      Accounting Officer)
CENTRAL
      ILLINOIS PUBLIC SERVICE COMPANY
(Registrant)
/s/
      Martin J. Lyons
---------------------------------------
Martin
      J.
      Lyons
Vice
      President and Controller
(Principal
      Accounting Officer)
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)
-
          5
          -
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:
      July 15, 2005
-
      6
      -