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      Ameren Combined 8-K dated June 1, 2006
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      STATES</font></div>
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      AND EXCHANGE COMMISSION</font></div>
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      D.C. 20549</font></div>
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                8-K</font></div>
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    <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</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">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">May
                30, 2006</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Commission
                File Number</u></font></div>
            </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>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><a name="Jurisdiction"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-14756</font></a></div>
            </td>
            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><a name="CFN"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
                Corporation</font></a></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Missouri
                Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1901
                Chouteau Avenue</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">St.
                Louis, Missouri 63103</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(314)
                621-3222</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
            <td align="justify" valign="top" width="27%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><a name="EIN"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">43-1723446</font></a></div>
            </td>
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            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-2967</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" 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>
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            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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>
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            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">2-95569</font></div>
            </td>
            <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>
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    <div>&#160;</div>
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      </div>
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    </div>
    <div>&#160;</div>
    <div>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><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>
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            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">1-3004</font></div>
            </td>
            <td align="left" valign="top" width="26%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Illinois
                Power Company</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Illinois
                Corporation)</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">370
                South Main Street </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Decatur,
                Illinois 62523</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(217)
                424-6600</font></div>
            </td>
            <td align="left" valign="top" width="27%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">37-0344645</font></div>
            </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"><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: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[
&#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; 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">[&#160;
]
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: -4.5pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">[
&#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; 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">[
      ]
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
      8.01
      Other Events.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 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">On
      May
      30, 2006, Ameren Corporation (&#8220;Ameren&#8221;) initiated steps to revise its multi-year
      committed credit facilities. Ameren currently has two committed bank credit
      facilities totaling $1.5 billion. Subject to final negotiations, execution
      of
      definitive agreements and receipt of necessary regulatory approvals, Ameren
      and
      certain of its subsidiaries plan to amend and terminate existing credit
      facilities and enter into a new facility for its Illinois operations as
      described below.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren,
      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;), and the agent banks under the $1.15 billion Five-Year
      Revolving Credit Agreement dated as of July 14, 2005 (the &#8220;Multi-Borrower Credit
      Agreement&#8221;) have agreed to certain amendments to the Multi-Borrower Credit
      Agreement. Effectiveness of the amendments is conditioned on receipt of
      necessary consents of the lending banks under the Multi-Borrower Credit
      Agreement. A copy of the Multi-Borrower Credit Agreement was filed as Exhibit
      10.1 to Ameren&#8217;s combined Current Report on Form 8-K filed on July 15, 2005 (the
&#8220;July 15, 2005 Form 8-K&#8221;). </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Related
      to the proposed amendments to the Multi-Borrower Credit Agreement and subject
      to
      the terms of a commitment letter dated May 30, 2006, CIPS, CILCO and IP
      (collectively, the &#8220;Ameren Illinois Utilities&#8221;), AmerenEnergy Resources
      Generating Company (&#8220;AERG&#8221;) and CILCORP Inc. (&#8220;CILCORP&#8221;) (collectively with the
      Ameren Illinois Utilities, the &#8220;Illinois Facility Borrowers&#8221;) propose to obtain
      a separate, multi-year senior secured credit facility in an aggregate principal
      amount of $500 million (the &#8220;Illinois Facility&#8221;). Effectiveness of the Illinois
      Facility is subject to negotiation of a definitive agreement with the lending
      banks and, with respect to the Ameren Illinois Utilities, receipt of necessary
      regulatory approvals. The term of the Illinois Facility is expected to be
      approximately 3-1/2 years. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
      will be required to terminate its $350 million Amended and Restated Five-Year
      Revolving Credit Agreement dated as of July 14, 2005 in order for the amendments
      to the Multi-Borrower Credit Agreement to become effective and as a condition
      to
      closing the Illinois Facility. Such termination will be without any
      early</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 27pt; 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">
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        </div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">-2-</font></div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">termination
      penalty. A copy of the $350 million Amended and Restated Five-Year Revolving
      Credit Agreement dated as of July 14, 2005 was filed as Exhibit 10.2 to the
      July
      15, 2005 Form 8-K.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Under
      the
      proposed revisions, each Ameren Illinois Utility will continue to be a borrower
      under, and subject to the covenants of, the amended Multi-Borrower Credit
      Agreement until it satisfies all conditions to availability under the Illinois
      Facility, at which time it will become a borrower under the Illinois Facility
      (and become subject to the covenants therein), cease to be a party to the
      amended Multi-Borrower Credit Agreement and repay all its loans, and transfer
      to
      the Illinois Facility all letters of credit outstanding for its account, under
      the amended Multi-Borrower Credit Agreement. From and after the time each Ameren
      Illinois Utility ceases to be a borrower under the amended Multi-Borrower Credit
      Agreement, (i) restrictions will apply limiting investments in and other
      transfers to such Ameren Illinois Utility and its subsidiaries by Ameren and
      certain subsidiaries and (ii) such Ameren Illinois Utility and its subsidiaries
      will be excluded for purposes of determining compliance with the 65% total
      consolidated indebtedness to total consolidated capitalization financial
      covenant that will remain in the amended Multi-Borrower Credit Agreement. Under
      the amended Multi-Borrower Credit Agreement, Ameren will continue to have $1.15
      billion of borrowing availability, UE will have $500 million of borrowing
      availability and Genco will have $150 million of borrowing availability.
</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the current terms of the Multi-Borrower Credit Agreement, the availability
      of
      loans thereunder will cease for the Ameren Illinois Utilities on July 13, 2006
      whether or not the Illinois Facility is then in place. Subject to the conditions
      described herein, Ameren expects the proposed amendments to the Multi-Borrower
      Credit Agreement and the Illinois Facility to be effective by early July 2006.
      Notwithstanding the timing of the effectiveness of the Illinois Facility and
      the
      availability under the Multi-Borrower Credit Agreement, the Ameren Illinois
      Utilities will continue to have access to short-term funding via Ameren&#8217;s
      utility money pool and other intercompany borrowing arrangements. The term
      of
      the Multi-Borrower Credit Agreement will not change for Ameren (current
      termination date of July 14, 2010) and UE and Genco will continue to be subject
      to the provision to obtain annual renewals of their termination dates (currently
      July 13, 2006).</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div 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
      obligations of each Illinois Facility Borrower will be several and not joint,
      and the maximum amount available to each company, including for issuance of
      letters of credit on its behalf, is expected to be limited as follows: CIPS
      -
      $135 million, CILCO - $150 million, IP - $150 million, AERG - $200 million
      and
      CILCORP - $50 million. The Illinois Facility Borrowers will use the proceeds
      of
      any borrowings for working capital and other general corporate purposes;
      however, a portion of the borrowings by AERG may be limited to financing or
      refinancing the development, management and/or operation of any of its projects
      or assets. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Borrowings
      under the Illinois Facility will bear interest, at the election of the borrower,
      at (1) a Eurodollar rate plus a margin applicable to the particular borrowing
      company or (2) a rate equal to the higher of the prime rate of JPMorgan Chase
      Bank, N.A or the federal funds effective rate plus &#189;% per year, plus a margin
      applicable to the particular borrowing company. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      obligations of the Ameren Illinois Utilities under the Illinois Facility will
      be
      secured by the issuance of mortgage bonds by each such utility under its
      respective mortgage indenture. The obligations of CILCORP will be secured by
      a
      pledge of the common stock of CILCO (which pledge will be on an equal and
      ratable basis with the pledge of such common stock by CILCORP to secure its
      9.375% senior bonds and 8.70% senior notes). The obligations of AERG under
      the
      Illinois Facility will be secured by a mortgage and security interest in its
      E.D. Edwards and Duck Creek generating stations and related licenses, permits
      and similar rights. The Illinois Facility is expected to limit the amount of
      other secured indebtedness issuable by each Illinois Facility Borrower as
      follows: for the Ameren Illinois Utilities, other secured debt is limited to
      that permitted under their respective mortgage indentures (subject to a covenant
      regarding excess bonding capacity described in the following sentence); for
      CILCORP, other secured debt is limited to $550 million secured by the pledge
      of
      CILCO stock and for AERG, other secured debt is limited to $200 million secured
      on a parity basis with its obligations under the Illinois Facility. The Illinois
      Facility is expected to provide that each of the Ameren Illinois Utilities
      will
      agree to reserve future bonding capacity under its mortgage indenture (that
      is,
      agree to forego the issuance of additional mortgage bonds otherwise permitted
      under the terms of its mortgage indenture) in the following amounts: CILCO,
      $25
      million, IP, $100 million and CIPS in amounts to be determined, increasing
      to
      $150 million at December 31, 2008.</font></div>
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    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
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      <div>&#160;</div>
    </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
      Illinois Facility is expected to have terms similar to the Multi-Borrower Credit
      Agreement, including conditions to borrowings and issuance of letters of credit
      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
      Illinois Facility is expected to contain non-financial covenants similar to
      the
      Multi-Borrower Credit Agreement including restrictions on the ability to incur
      liens, dispose of assets and merge with other entities. In addition, the
      Illinois Facility is expected to have non-financial covenants to limit the
      ability of a borrower to invest in or transfer assets to affiliates, covenants
      regarding the status of the collateral securing the Illinois Facility and
      validity of the security interests therein and limitations on dividends,
      distributions and other payments on capital stock of the Illinois Facility
      Borrowers if an event of default has occurred and is continuing or in the event
      of certain changes to ratings to below investment grade (or, in the case of
      AERG
      if it is unrated, failure by AERG to maintain one or more financial ratios).
      The
      events of default in the Illinois Facility are expected to be similar to those
      contained in the Multi-Borrower Credit Agreement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      anticipated financial covenant in the Illinois Facility will require each
      Illinois Facility Borrower to maintain consolidated indebtedness of not more
      than 65% of consolidated total capitalization.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Upon
      the
      effectiveness of the Illinois Facility, events of default are expected to apply
      separately to each Illinois Facility Borrower (and, subject to exceptions,
      their
      subsidiaries). Upon the effectiveness of the proposed amendments to the
      Multi-Borrower Credit Agreement and the Illinois Facility, an event of default
      under the Illinois Facility is not expected to constitute an event of default
      under the Multi-Borrower Credit Agreement. The Illinois Facility is expected
      to
      provide that an event of default under the Multi-Borrower Credit Agreement
      will
      not constitute an event of default under the Illinois Facility.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Final
      negotiations of the proposed amendments to the Multi-Borrower Credit Agreement
      and the Illinois Facility may result in Ameren, the Illinois Facility Borrowers
      or other Ameren subsidiaries being subject to additional or different covenants,
      restrictions or events of default.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><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: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
      combined Form 8-K is being filed separately by Ameren Corporation, Union
      Electric Company, Central Illinois Public Service Company, Ameren Energy
      Generating Company, CILCORP Inc., Central Illinois Light Company and Illinois
      Power Company (each a &#8220;registrant&#8221;). Information contained herein relating to
      any individual registrant has been filed by such registrant on its own behalf.
      No registrant makes any representation as to information relating to any other
      registrant.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="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">FORWARD-LOOKING
      STATEMENTS</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Certain
      statements in this report relate to future events and expectations and as such
      constitute forward-looking statements involving known and unknown factors that
      may cause actual results of the registrants to be different from those expressed
      or implied in the forward-looking statements. In this context, words such as
      &#8220;expects,&#8221; &#8220;anticipates,&#8221; &#8220;intends,&#8221; &#8220;plans,&#8221; &#8220;believes,&#8221; &#8220;seeks,&#8221; &#8220;will,&#8221; or
      other similar words and phrases often identify forward-looking statements made
      on behalf of the registrants. It is important to note that actual results of
      the
      registrants may differ materially from those described or implied in such
      forward-looking statements based on a number of factors and uncertainties,
      including, but not limited to, regulatory actions, including changes in
      regulatory policies and ratemaking determinations; changes in laws and other
      governmental actions, including monetary and fiscal policies; the effects of
      increased competition in the future due to, among other things, deregulation
      of
      certain aspects of our business at both the state and federal levels, and the
      implementation of deregulation, such as when the current electric rate freeze
      and current power supply contracts expire in Illinois at the end of 2006;
      business and economic conditions, including their impact on interest rates;
      disruptions of the capital markets or other events that make the registrants
      access to necessary capital more difficult or costly; actions of credit rating
      agencies and the effects of such actions; legal and administrative proceedings;
      and other factors described in more detail in the registrants&#8217; filings with the
      Securities and Exchange Commission. We do not undertake to update our
      forward-looking statements.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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    </div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 333pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SIGNATURES</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Exchange Act of 1934, each registrant
      has
      duly caused this report to be signed on its behalf by the undersigned thereunto
      duly authorized. The signature for each undersigned company shall be deemed
      to
      relate only to matters having reference to such company or its
      subsidiaries.</font></div>
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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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        June 1, 2006</font></div>
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Ameren Combined 8-K dated June 1, 2006
UNITED
      STATES
SECURITIES
      AND EXCHANGE COMMISSION
Washington,
      D.C. 20549
FORM
                8-K
CURRENT
      REPORT
Pursuant
      to Section 13 or 15(d) of the
Securities
      Exchange Act of 1934
Date
      of
      report (Date of earliest event reported):
May
                30, 2006
Commission
                File Number
Exact
                Name of Registrant as Specified in Charter;
State
                of Incorporation;
Address
                and Telephone Number
IRS
                Employer
Identification
                Number
1-14756
Ameren
                Corporation
(Missouri
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
43-1723446
1-2967
Union
                Electric Company
(Missouri
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
43-0559760
1-3672
Central
                Illinois Public Service Company
(Illinois
                Corporation)
607
                East Adams Street
Springfield,
                Illinois 62739
(217)
                523-3600
37-0211380
333-56594
Ameren
                Energy Generating Company
(Illinois
                Corporation)
1901
                Chouteau Avenue
St.
                Louis, Missouri 63103
(314)
                621-3222
37-1395586
2-95569
CILCORP
                Inc.
(Illinois
                Corporation)
300
                Liberty Street
Peoria,
                Illinois 61602
(309)
                677-5271
37-1169387
1-2732
Central
                Illinois Light Company
(Illinois
                Corporation)
300
                Liberty Street
Peoria,
                Illinois 61602
(309)
                677-5271
37-0211050
1-3004
Illinois
                Power Company
(Illinois
                Corporation)
370
                South Main Street
Decatur,
                Illinois 62523
(217)
                424-6600
37-0344645
Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:
[
 ]
      Written communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
[ 
]
      Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
[
 ]
      Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
      Act
      (17 CFR 240.14d-2(b))
[
      ]
      Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
      Act
      (17 CFR 240.13e-4(c))
ITEM
      8.01
      Other Events.
On
      May
      30, 2006, Ameren Corporation ("Ameren") initiated steps to revise its multi-year
      committed credit facilities. Ameren currently has two committed bank credit
      facilities totaling $1.5 billion. Subject to final negotiations, execution
      of
      definitive agreements and receipt of necessary regulatory approvals, Ameren
      and
      certain of its subsidiaries plan to amend and terminate existing credit
      facilities and enter into a new facility for its Illinois operations as
      described below.
Ameren,
      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"), and the agent banks under the $1.15 billion Five-Year
      Revolving Credit Agreement dated as of July 14, 2005 (the "Multi-Borrower Credit
      Agreement") have agreed to certain amendments to the Multi-Borrower Credit
      Agreement. Effectiveness of the amendments is conditioned on receipt of
      necessary consents of the lending banks under the Multi-Borrower Credit
      Agreement. A copy of the Multi-Borrower Credit Agreement was filed as Exhibit
      10.1 to Ameren's combined Current Report on Form 8-K filed on July 15, 2005 (the
"July 15, 2005 Form 8-K").
Related
      to the proposed amendments to the Multi-Borrower Credit Agreement and subject
      to
      the terms of a commitment letter dated May 30, 2006, CIPS, CILCO and IP
      (collectively, the "Ameren Illinois Utilities"), AmerenEnergy Resources
      Generating Company ("AERG") and CILCORP Inc. ("CILCORP") (collectively with the
      Ameren Illinois Utilities, the "Illinois Facility Borrowers") propose to obtain
      a separate, multi-year senior secured credit facility in an aggregate principal
      amount of $500 million (the "Illinois Facility"). Effectiveness of the Illinois
      Facility is subject to negotiation of a definitive agreement with the lending
      banks and, with respect to the Ameren Illinois Utilities, receipt of necessary
      regulatory approvals. The term of the Illinois Facility is expected to be
      approximately 3-1/2 years.
Ameren
      will be required to terminate its $350 million Amended and Restated Five-Year
      Revolving Credit Agreement dated as of July 14, 2005 in order for the amendments
      to the Multi-Borrower Credit Agreement to become effective and as a condition
      to
      closing the Illinois Facility. Such termination will be without any
      early
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termination
      penalty. A copy of the $350 million Amended and Restated Five-Year Revolving
      Credit Agreement dated as of July 14, 2005 was filed as Exhibit 10.2 to the
      July
      15, 2005 Form 8-K.
Under
      the
      proposed revisions, each Ameren Illinois Utility will continue to be a borrower
      under, and subject to the covenants of, the amended Multi-Borrower Credit
      Agreement until it satisfies all conditions to availability under the Illinois
      Facility, at which time it will become a borrower under the Illinois Facility
      (and become subject to the covenants therein), cease to be a party to the
      amended Multi-Borrower Credit Agreement and repay all its loans, and transfer
      to
      the Illinois Facility all letters of credit outstanding for its account, under
      the amended Multi-Borrower Credit Agreement. From and after the time each Ameren
      Illinois Utility ceases to be a borrower under the amended Multi-Borrower Credit
      Agreement, (i) restrictions will apply limiting investments in and other
      transfers to such Ameren Illinois Utility and its subsidiaries by Ameren and
      certain subsidiaries and (ii) such Ameren Illinois Utility and its subsidiaries
      will be excluded for purposes of determining compliance with the 65% total
      consolidated indebtedness to total consolidated capitalization financial
      covenant that will remain in the amended Multi-Borrower Credit Agreement. Under
      the amended Multi-Borrower Credit Agreement, Ameren will continue to have $1.15
      billion of borrowing availability, UE will have $500 million of borrowing
      availability and Genco will have $150 million of borrowing availability.
Pursuant
      to the current terms of the Multi-Borrower Credit Agreement, the availability
      of
      loans thereunder will cease for the Ameren Illinois Utilities on July 13, 2006
      whether or not the Illinois Facility is then in place. Subject to the conditions
      described herein, Ameren expects the proposed amendments to the Multi-Borrower
      Credit Agreement and the Illinois Facility to be effective by early July 2006.
      Notwithstanding the timing of the effectiveness of the Illinois Facility and
      the
      availability under the Multi-Borrower Credit Agreement, the Ameren Illinois
      Utilities will continue to have access to short-term funding via Ameren's
      utility money pool and other intercompany borrowing arrangements. The term
      of
      the Multi-Borrower Credit Agreement will not change for Ameren (current
      termination date of July 14, 2010) and UE and Genco will continue to be subject
      to the provision to obtain annual renewals of their termination dates (currently
      July 13, 2006).
The
      obligations of each Illinois Facility Borrower will be several and not joint,
      and the maximum amount available to each company, including for issuance of
      letters of credit on its behalf, is expected to be limited as follows: CIPS
      -
      $135 million, CILCO - $150 million, IP - $150 million, AERG - $200 million
      and
      CILCORP - $50 million. The Illinois Facility Borrowers will use the proceeds
      of
      any borrowings for working capital and other general corporate purposes;
      however, a portion of the borrowings by AERG may be limited to financing or
      refinancing the development, management and/or operation of any of its projects
      or assets.
Borrowings
      under the Illinois Facility will bear interest, at the election of the borrower,
      at (1) a Eurodollar rate plus a margin applicable to the particular borrowing
      company or (2) a rate equal to the higher of the prime rate of JPMorgan Chase
      Bank, N.A or the federal funds effective rate plus ½% per year, plus a margin
      applicable to the particular borrowing company.
The
      obligations of the Ameren Illinois Utilities under the Illinois Facility will
      be
      secured by the issuance of mortgage bonds by each such utility under its
      respective mortgage indenture. The obligations of CILCORP will be secured by
      a
      pledge of the common stock of CILCO (which pledge will be on an equal and
      ratable basis with the pledge of such common stock by CILCORP to secure its
      9.375% senior bonds and 8.70% senior notes). The obligations of AERG under
      the
      Illinois Facility will be secured by a mortgage and security interest in its
      E.D. Edwards and Duck Creek generating stations and related licenses, permits
      and similar rights. The Illinois Facility is expected to limit the amount of
      other secured indebtedness issuable by each Illinois Facility Borrower as
      follows: for the Ameren Illinois Utilities, other secured debt is limited to
      that permitted under their respective mortgage indentures (subject to a covenant
      regarding excess bonding capacity described in the following sentence); for
      CILCORP, other secured debt is limited to $550 million secured by the pledge
      of
      CILCO stock and for AERG, other secured debt is limited to $200 million secured
      on a parity basis with its obligations under the Illinois Facility. The Illinois
      Facility is expected to provide that each of the Ameren Illinois Utilities
      will
      agree to reserve future bonding capacity under its mortgage indenture (that
      is,
      agree to forego the issuance of additional mortgage bonds otherwise permitted
      under the terms of its mortgage indenture) in the following amounts: CILCO,
      $25
      million, IP, $100 million and CIPS in amounts to be determined, increasing
      to
      $150 million at December 31, 2008.
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The
      Illinois Facility is expected to have terms similar to the Multi-Borrower Credit
      Agreement, including conditions to borrowings and issuance of letters of credit
      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
      Illinois Facility is expected to contain non-financial covenants similar to
      the
      Multi-Borrower Credit Agreement including restrictions on the ability to incur
      liens, dispose of assets and merge with other entities. In addition, the
      Illinois Facility is expected to have non-financial covenants to limit the
      ability of a borrower to invest in or transfer assets to affiliates, covenants
      regarding the status of the collateral securing the Illinois Facility and
      validity of the security interests therein and limitations on dividends,
      distributions and other payments on capital stock of the Illinois Facility
      Borrowers if an event of default has occurred and is continuing or in the event
      of certain changes to ratings to below investment grade (or, in the case of
      AERG
      if it is unrated, failure by AERG to maintain one or more financial ratios).
      The
      events of default in the Illinois Facility are expected to be similar to those
      contained in the Multi-Borrower Credit Agreement.
The
      anticipated financial covenant in the Illinois Facility will require each
      Illinois Facility Borrower to maintain consolidated indebtedness of not more
      than 65% of consolidated total capitalization.
Upon
      the
      effectiveness of the Illinois Facility, events of default are expected to apply
      separately to each Illinois Facility Borrower (and, subject to exceptions,
      their
      subsidiaries). Upon the effectiveness of the proposed amendments to the
      Multi-Borrower Credit Agreement and the Illinois Facility, an event of default
      under the Illinois Facility is not expected to constitute an event of default
      under the Multi-Borrower Credit Agreement. The Illinois Facility is expected
      to
      provide that an event of default under the Multi-Borrower Credit Agreement
      will
      not constitute an event of default under the Illinois Facility.
Final
      negotiations of the proposed amendments to the Multi-Borrower Credit Agreement
      and the Illinois Facility may result in Ameren, the Illinois Facility Borrowers
      or other Ameren subsidiaries being subject to additional or different covenants,
      restrictions or events of default.
-
      - - - -
      - - - - - - - - - - - - - - -
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.
FORWARD-LOOKING
      STATEMENTS
Certain
      statements in this report relate to future events and expectations and as such
      constitute forward-looking statements involving known and unknown factors that
      may cause actual results of the registrants to be different from those expressed
      or implied in the forward-looking statements. In this context, words such as
      "expects," "anticipates," "intends," "plans," "believes," "seeks," "will," or
      other similar words and phrases often identify forward-looking statements made
      on behalf of the registrants. It is important to note that actual results of
      the
      registrants may differ materially from those described or implied in such
      forward-looking statements based on a number of factors and uncertainties,
      including, but not limited to, regulatory actions, including changes in
      regulatory policies and ratemaking determinations; changes in laws and other
      governmental actions, including monetary and fiscal policies; the effects of
      increased competition in the future due to, among other things, deregulation
      of
      certain aspects of our business at both the state and federal levels, and the
      implementation of deregulation, such as when the current electric rate freeze
      and current power supply contracts expire in Illinois at the end of 2006;
      business and economic conditions, including their impact on interest rates;
      disruptions of the capital markets or other events that make the registrants
      access to necessary capital more difficult or costly; actions of credit rating
      agencies and the effects of such actions; legal and administrative proceedings;
      and other factors described in more detail in the registrants' filings with the
      Securities and Exchange Commission. We do not undertake to update our
      forward-looking statements.
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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/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
UNION
      ELECTRIC COMPANY
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
CENTRAL
      ILLINOIS PUBLIC SERVICE COMPANY
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
AMEREN
      ENERGY GENERATING COMPANY
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
CILCORP
      Inc.
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
-5-
CENTRAL
      ILLINOIS LIGHT COMPANY
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
ILLINOIS
      POWER COMPANY
(Registrant)
/s/
      Jerre E. Birdsong
Jerre
      E.
      Birdsong
Vice
      President and Treasurer
Date:
        June 1, 2006
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