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      <div style="DISPLAY: block; TEXT-INDENT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">UNITED
STATES</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECURITIES
AND EXCHANGE COMMISSION</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
D.C.&#160;&#160;20549</font></div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%">
            <tr>
              <td valign="top" width="24%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font>

                <hr style="COLOR: black" align="center" noshade size="2" width="20%">    </td>
            </tr>
            <tr>
              <td valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">FORM
      8-K</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="24%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT
REPORT</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to Section 13 or 15(d) of the</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities
Exchange Act of 1934</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 207pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of
report (Date of earliest event
reported):&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<a name="ReportDate" /></font></div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%">
            <tr>
              <td valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">March
      26, 2008</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><a name="Registrant"><br></a></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div align="center">
        <table cellpadding="0" cellspacing="0" width="85%">
            <tr>
              <td valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Commission File
      Number</font></font></div>
              </td>
              <td align="left" valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Exact
      Name of Registrant as </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Specified
      in Charter;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">State
      of Incorporation;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Address and Telephone
      Number</font></font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman; TEXT-DECORATION: none">IRS
      Employer</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Identification
      Number</font></font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="jurisdiction">1-14756</a></font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="cfn">Ameren Corporation</a></font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Missouri
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1901
      Chouteau Avenue</font></div>
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      Louis, Missouri 63103</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(314)
      621-3222</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><a name="ein">43-1723446</a></font></div>
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            </tr>
            <tr>
              <td align="left" valign="top" width="28%">
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              </td>
              <td align="left" valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Central
      Illinois Public Service </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Illinois
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">607
      East Adams Street</font></div>
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      Illinois 62739</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(888)
      789-2477</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">37-0211380</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">333-56594</font></div>
              </td>
              <td align="left" valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren
      Energy Generating</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Illinois
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1901
      Chouteau Avenue</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">St.
      Louis, Missouri 63103</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(314)
      621-3222</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              </td>
              <td align="left" valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">37-1395586</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">2-95569</font></div>
              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCORP
      Inc.</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Illinois
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">300
      Liberty Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Peoria,
      Illinois 61602</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(309)
      677-5271</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">37-1169387</font></div>
              </td>
            </tr>
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      </div>
      <div>&#160;</div>
      <div>&#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">&#160;</div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
        </div>
      </div>
      <div>&#160;</div>
      <div align="center">
        <table cellpadding="0" cellspacing="0" width="85%">
            <tr>
              <td align="left" valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1-2732</font></div>
              </td>
              <td align="left" valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Central
      Illinois Light Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Illinois
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">300
      Liberty Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Peoria,
      Illinois 61602</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(309)
      677-5271</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">37-0211050</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="28%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">1-3004</font></div>
              </td>
              <td align="left" valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Illinois
      Power Company</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(Illinois
      Corporation)</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">370
      South Main Street</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Decatur,
      Illinois 62523</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">(217)
      424-6600</font></div>
              </td>
              <td align="left" valign="top" width="22%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">37-0344645</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><a name="Address" /><a name="Zip"><br></a></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;[&#160;
] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;[&#160;
] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: -4.5pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;[
&#160;] Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;[
&#160;] Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">-2-</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
        </div>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
1.01<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;Entry into a Material
Definitive Agreement.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendments to Credit
Agreements</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ameren
Corporation (&#8220;Ameren&#8221;) previously announced that certain of its subsidiaries had
entered into two multi-year committed bank credit facilities, a Credit Agreement
dated as of July 14, 2006 (the &#8220;2006 Credit Agreement&#8221;) and a Credit Agreement
dated as of February 9, 2007 (the &#8220;2007 Credit Agreement,&#8221; and, together with
the 2006 Credit Agreement, the &#8220;Illinois Credit Agreements&#8221;). See Current
Reports on Form 8-K filed July 18, 2006 and February 13, 2007.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On March
26, 2008, Central Illinois Public Service Company, doing business as AmerenCIPS
(&#8220;CIPS&#8221;), Central Illinois Light Company, doing business as AmerenCILCO
(&#8220;CILCO&#8221;), and Illinois Power Company, doing business as AmerenIP (&#8220;IP&#8221; and
collectively with CIPS and CILCO, the &#8220;Ameren Illinois Utilities&#8221;), and the
other parties to the Illinois Credit Agreements, including CILCORP Inc., entered
into amendments to the Illinois Credit Agreements to delete certain covenants
contained in the Illinois Credit Agreements, effective March 26,
2008.&#160;&#160;Under the Illinois Credit Agreements, each of CIPS, CILCO and
IP were required to reserve future bonding capacity under their respective
mortgage indentures (that is, they agreed to forgo the issuance of additional
mortgage bonds otherwise permitted under the terms of each mortgage indenture)
in amounts specified in the Illinois Credit Agreements.&#160;&#160;Under the
March 26, 2008 amendments, none of the Ameren Illinois Utilities will thereafter
be required to observe this requirement.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline">For a further description of the Illinois Credit
Agreements, see Note 4 &#8211; Credit Facilities and Liquidity to the financial
statements under Part II, Item 8, of the Annual Report on Form 10-K for the year
ended December 31, 2007.</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendment to Power Supply
Agreement</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
December 18, 2006, Ameren Energy Marketing Company (&#8220;Marketing Company&#8221;) and
Ameren Energy Generating Company (&#8220;Genco&#8221;) entered into a Power Supply Agreement
(&#8220;Genco PSA&#8221;). Each of Genco and Marketing Company are direct subsidiaries of
Ameren Energy Resources Company, LLC and indirect subsidiaries of
Ameren.&#160;&#160;See the Form 8-K filed by Ameren, CILCORP Inc., CILCO and
Genco on December 21, 2006.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On March
28, 2008, Genco and Marketing Company entered into an amendment, effective
immediately, of the Genco PSA.&#160;&#160;Under the amendment, Genco will be
liable to Marketing Company in the event of an unplanned outage or derate
(reduction in rated capacity) due to sudden, unanticipated failure or accident
within the&#160;generating plant site of one or more of its generating
units.&#160;&#160;Genco&#8217;s liability in such case will be for the positive
difference, if any, between the market price of capacity and/or energy Genco
does not deliver and the contract price under the Genco PSA&#160;for that
capacity and/or energy.&#160;&#160;Genco has insurance that covers many but not
all of these situations, subject to deductibles and policy limits.&#160;&#160;An
unplanned outage or derate that continues for one year or more is an event of
default under the Genco PSA.<font style="DISPLAY: inline">&#160;</font><font style="DISPLAY: inline">&#160;</font><font style="DISPLAY: inline">In the event
of Marketing Company</font><font style="DISPLAY: inline">&#8217;</font><font style="DISPLAY: inline">s unexcused failure to receive energy under the Genco
PSA, Marketing Company would be required to pay Genco, the positive difference,
if any, between the contract price and the price actually received by Genco,
acting in</font><font style="DISPLAY: inline"> a commercially reasonable manner,
to resell the unreceived energy, less any reasonable related transmission,
ancillary service, or brokerage costs.</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#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">&#160;</div>
          </div>
          <div id="PN" style="PAGE-BREAK-AFTER: always">
            <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; 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">&#160;</div>
          </div>
        </div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
8.01<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;Other
Events.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
December 18, 2006, Marketing Company and AmerenEnergy Resources Generating
Company, (&#8220;AERG&#8221;) also entered into a Power Supply Agreement (&#8220;AERG PSA&#8221;). AERG
is a direct subsidiary of CILCO and an indirect subsidiary of CILCORP Inc. and
Ameren.&#160;&#160;See the Form 8-K filed by Ameren, CILCORP Inc., CILCO and
Genco on December 21, 2006.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On March
28, 2008, AERG and Marketing Company entered into an amendment, effective
immediately, of the AERG PSA.&#160;&#160;Under the amendment, AERG will be
liable to Marketing Company in the event of an unplanned outage or derate
(reduction in rated capacity) due to&#160;sudden, unanticipated failure or
accident within the generating plant site of one or more of its generating
units.&#160;&#160;AERG&#8217;s liability in such case will be for the positive
difference, if any, between the market price of capacity and/or energy AERG does
not&#160;deliver and the contract price under the AERG PSA for that capacity
and/or energy.&#160;&#160;AERG has insurance that covers many but not all of
these situations, subject to deductibles and policy limits.&#160;&#160;An
unplanned outage or derate that continues for one year or more is an event of
default under the AERG PSA.<font style="DISPLAY: inline">&#160;&#160;In the
event of Marketing Company</font><font style="DISPLAY: inline">&#8217;</font><font style="DISPLAY: inline">s unexcused failure to receive energy under the AERG
PSA, Marketing Company would be required to pay AERG, the positive difference,
if any, between the contract price and t</font><font style="DISPLAY: inline">he
price actually received by AERG, acting in a commercially reasonable manner, to
resell the unreceived energy, less any reasonable related transmission,
ancillary service, or brokerage costs.</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ITEM
9.01<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;Financial Statements
and Exhibits.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)
Exhibits</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%">
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Exhibit
      Number</font>:</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td align="left" valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Registrant(s):</font></font></div>
              </td>
              <td align="left" valign="top" width="58%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Title</font>:</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.1
      *</font></div>
              </td>
              <td align="left" valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CIPS;
      CILCORP; </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCO;
      IP</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td align="left" valign="top" width="58%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amendment
      dated as of March 26, 2008 to the Credit </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Agreement
      dated as of July 14, 2006</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.2
      *</font></div>
              </td>
              <td align="left" valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CIPS;
      CILCORP; </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCO;
      IP</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              </td>
              <td align="left" valign="top" width="58%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amendment
      dated as of March 26, 2008 to the Credit </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Agreement
      dated as of February 9, 2007</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.3
      *</font></div>
              </td>
              <td align="left" valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren;
      Genco</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td align="left" valign="top" width="58%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended
      and Restated Power Supply Agreement between </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren
      Energy Generating Company and Ameren Energy </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Marketing
      Company, dated March 28, 2008</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.1
      *</font></div>
              </td>
              <td align="left" valign="top" width="24%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren;</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCORP;
      CILCO</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
              <td align="left" valign="top" width="58%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Amended
      and Restated Power Supply Agreement between </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">AmerenEnergy
      Resources Generating Company and </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren
      Energy Marketing Company, dated March 28, </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">2008</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">*&#160;&#160;&#160;&#160;Filed
herewith.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">- - - - -
- - - - - - - - - - - - - - -</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left" align="center">&#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">&#160;</div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">-4-</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">&#160;</div>
        </div>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>This combined Form 8-K is being filed
separately by Ameren Corporation, Central Illinois Public Service Company,
Ameren Energy Generating Company, CILCORP Inc., Central Illinois Light Company
and Illinois Power Company (each a &#8220;registrant&#8221;).&#160;&#160;Information
contained herein relating to any individual registrant has been filed by such
registrant on its own behalf.&#160;&#160;No registrant makes any representation
as to information relating to any other registrant.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#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: 10pt; FONT-FAMILY: Times New Roman">-5-</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
        </div>
      </div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SIGNATURES</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Pursuant to the requirements of the
Securities Exchange Act of 1934, each registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly
authorized.&#160;&#160;The signature for each undersigned company shall be
deemed to relate only to matters having reference to such company or its
subsidiaries.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">AMEREN
CORPORATION</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">&#160;/s/ Martin J.
Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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Lyons</font></div>
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Vice President and Chief Accounting Officer</font></div>
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ILLINOIS PUBLIC SERVICE COMPANY</font></div>
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Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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Lyons</font></div>
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Vice President and Chief Accounting Officer</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; 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: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">/s/ Martin J.
Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin J.
Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
Vice President and Chief Accounting Officer</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CILCORP
INC.</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">/s/ Martin J.
Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin J.
Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
Vice President and Chief Accounting Officer</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CENTRAL
ILLINOIS LIGHT COMPANY</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">/s/ Martin J.
Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin J.
Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
Vice President and Chief Accounting Officer</font></div>
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          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
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POWER COMPANY</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">/s/ Martin J.
Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Martin J.
Lyons</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 342pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Senior
Vice President and Chief Accounting Officer</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:&#160;&#160;March
28, 2008</font></div>
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Index</font></div>
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            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Exhibit
      Number</font>:</font></div>
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              </td>
              <td align="left" valign="top" width="25%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">Registrant(s):</font></font></div>
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      *</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CIPS;
      CILCORP; </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCO;&#160;&#160;IP</font></div>
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      dated as of March 26, 2008 to the Credit </font></div>
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                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.2
      *</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CIPS;
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">CILCO;&#160;&#160;IP</font></div>
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                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="18%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.3
      *</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Ameren;
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                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
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      Energy Generating Company and Ameren Energy </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Marketing
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                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
            </tr>
            <tr>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">99.1
      *</font></div>
              </td>
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                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">2008</font></div>
                <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
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            </tr>
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herewith</font></div><br><br>-8-</div>
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ameren8k03282008.htm
UNITED
STATES
SECURITIES
AND EXCHANGE COMMISSION
Washington,
D.C.  20549
FORM
      8-K
CURRENT
REPORT
Pursuant
to Section 13 or 15(d) of the
Securities
Exchange Act of 1934
Date of
report (Date of earliest event
reported):
March
      26, 2008
Commission File
      Number
Exact
      Name of Registrant as
Specified
      in Charter;
State
      of Incorporation;
Address and Telephone
      Number
IRS
      Employer
Identification
      Number
1-14756
Ameren Corporation
(Missouri
      Corporation)
1901
      Chouteau Avenue
St.
      Louis, Missouri 63103
(314)
      621-3222
43-1723446
1-3672
Central
      Illinois Public Service
Company
(Illinois
      Corporation)
607
      East Adams Street
Springfield,
      Illinois 62739
(888)
      789-2477
37-0211380
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))
-2-
ITEM
1.01
Entry into a Material
Definitive Agreement.
Amendments to Credit
Agreements
Ameren
Corporation ("Ameren") previously announced that certain of its subsidiaries had
entered into two multi-year committed bank credit facilities, a Credit Agreement
dated as of July 14, 2006 (the "2006 Credit Agreement") and a Credit Agreement
dated as of February 9, 2007 (the "2007 Credit Agreement," and, together with
the 2006 Credit Agreement, the "Illinois Credit Agreements"). See Current
Reports on Form 8-K filed July 18, 2006 and February 13, 2007.
On March
26, 2008, Central Illinois Public Service Company, doing business as AmerenCIPS
("CIPS"), Central Illinois Light Company, doing business as AmerenCILCO
("CILCO"), and Illinois Power Company, doing business as AmerenIP ("IP" and
collectively with CIPS and CILCO, the "Ameren Illinois Utilities"), and the
other parties to the Illinois Credit Agreements, including CILCORP Inc., entered
into amendments to the Illinois Credit Agreements to delete certain covenants
contained in the Illinois Credit Agreements, effective March 26,
2008.  Under the Illinois Credit Agreements, each of CIPS, CILCO and
IP were required to reserve future bonding capacity under their respective
mortgage indentures (that is, they agreed to forgo the issuance of additional
mortgage bonds otherwise permitted under the terms of each mortgage indenture)
in amounts specified in the Illinois Credit Agreements.  Under the
March 26, 2008 amendments, none of the Ameren Illinois Utilities will thereafter
be required to observe this requirement.
For a further description of the Illinois Credit
Agreements, see Note 4 – Credit Facilities and Liquidity to the financial
statements under Part II, Item 8, of the Annual Report on Form 10-K for the year
ended December 31, 2007.
Amendment to Power Supply
Agreement
On
December 18, 2006, Ameren Energy Marketing Company ("Marketing Company") and
Ameren Energy Generating Company ("Genco") entered into a Power Supply Agreement
("Genco PSA"). Each of Genco and Marketing Company are direct subsidiaries of
Ameren Energy Resources Company, LLC and indirect subsidiaries of
Ameren.  See the Form 8-K filed by Ameren, CILCORP Inc., CILCO and
Genco on December 21, 2006.
On March
28, 2008, Genco and Marketing Company entered into an amendment, effective
immediately, of the Genco PSA.  Under the amendment, Genco will be
liable to Marketing Company in the event of an unplanned outage or derate
(reduction in rated capacity) due to sudden, unanticipated failure or accident
within the generating plant site of one or more of its generating
units.  Genco's liability in such case will be for the positive
difference, if any, between the market price of capacity and/or energy Genco
does not deliver and the contract price under the Genco PSA for that
capacity and/or energy.  Genco has insurance that covers many but not
all of these situations, subject to deductibles and policy limits.  An
unplanned outage or derate that continues for one year or more is an event of
default under the Genco PSA.
In the event
of Marketing Company
'
s unexcused failure to receive energy under the Genco
PSA, Marketing Company would be required to pay Genco, the positive difference,
if any, between the contract price and the price actually received by Genco,
acting in
a commercially reasonable manner,
to resell the unreceived energy, less any reasonable related transmission,
ancillary service, or brokerage costs.
-3-
ITEM
8.01
Other
Events.
On
December 18, 2006, Marketing Company and AmerenEnergy Resources Generating
Company, ("AERG") also entered into a Power Supply Agreement ("AERG PSA"). AERG
is a direct subsidiary of CILCO and an indirect subsidiary of CILCORP Inc. and
Ameren.  See the Form 8-K filed by Ameren, CILCORP Inc., CILCO and
Genco on December 21, 2006.
On March
28, 2008, AERG and Marketing Company entered into an amendment, effective
immediately, of the AERG PSA.  Under the amendment, AERG will be
liable to Marketing Company in the event of an unplanned outage or derate
(reduction in rated capacity) due to sudden, unanticipated failure or
accident within the generating plant site of one or more of its generating
units.  AERG's liability in such case will be for the positive
difference, if any, between the market price of capacity and/or energy AERG does
not deliver and the contract price under the AERG PSA for that capacity
and/or energy.  AERG has insurance that covers many but not all of
these situations, subject to deductibles and policy limits.  An
unplanned outage or derate that continues for one year or more is an event of
default under the AERG PSA.
In the
event of Marketing Company
'
s unexcused failure to receive energy under the AERG
PSA, Marketing Company would be required to pay AERG, the positive difference,
if any, between the contract price and t
he
price actually received by AERG, acting in a commercially reasonable manner, to
resell the unreceived energy, less any reasonable related transmission,
ancillary service, or brokerage costs.
ITEM
9.01
Financial Statements
and Exhibits.
(d)
Exhibits
Exhibit
      Number
:
Registrant(s):
Title
:
10.1
      *
Ameren;
CIPS;
      CILCORP;
CILCO;
      IP
Amendment
      dated as of March 26, 2008 to the Credit
Agreement
      dated as of July 14, 2006
10.2
      *
Ameren;
CIPS;
      CILCORP;
CILCO;
      IP
Amendment
      dated as of March 26, 2008 to the Credit
Agreement
      dated as of February 9, 2007
10.3
      *
Ameren;
      Genco
Amended
      and Restated Power Supply Agreement between
Ameren
      Energy Generating Company and Ameren Energy
Marketing
      Company, dated March 28, 2008
99.1
      *
Ameren;
CILCORP;
      CILCO
Amended
      and Restated Power Supply Agreement between
AmerenEnergy
      Resources Generating Company and
Ameren
      Energy Marketing Company, dated March 28,
2008
*    Filed
herewith.
- - - - -
- - - - - - - - - - - - - - -
-4-
This combined Form 8-K is being filed
separately by Ameren Corporation, Central Illinois Public Service Company,
Ameren Energy Generating Company, CILCORP Inc., Central Illinois Light Company
and Illinois Power Company (each a "registrant").  Information
contained herein relating to any individual registrant has been filed by such
registrant on its own behalf.  No registrant makes any representation
as to information relating to any other registrant.
-5-
SIGNATURES
Pursuant to the requirements of the
Securities Exchange Act of 1934, each registrant has duly caused this report to
be signed on its behalf by the undersigned thereunto duly
authorized.  The signature for each undersigned company shall be
deemed to relate only to matters having reference to such company or its
subsidiaries.
AMEREN
CORPORATION
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
CENTRAL
ILLINOIS PUBLIC SERVICE COMPANY
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
AMEREN
ENERGY GENERATING COMPANY
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
CILCORP
INC.
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
CENTRAL
ILLINOIS LIGHT COMPANY
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
-6-
ILLINOIS
POWER COMPANY
(Registrant)
/s/ Martin J.
Lyons
Martin J.
Lyons
Senior
Vice President and Chief Accounting Officer
Date:  March
28, 2008
-7-
Exhibit
Index
Exhibit
      Number
:
Registrant(s):
Title
:
10.1
      *
Ameren;
CIPS;
      CILCORP;
CILCO;  IP
Amendment
      dated as of March 26, 2008 to the Credit
Agreement
      dated as of July 14, 2006
10.2
      *
Ameren;
CIPS;
      CILCORP;
CILCO;  IP
Amendment
      dated as of March 26, 2008 to the Credit
Agreement
      dated as of February 9, 2007
10.3
      *
Ameren;
      Genco
Amended
      and Restated Power Supply Agreement between
Ameren
      Energy Generating Company and Ameren Energy
Marketing
      Company, dated March 28, 2008
99.1
      *
Ameren;
CILCORP;
      CILCO
Amended
      and Restated Power Supply Agreement between
AmerenEnergy
      Resources Generating Company and
Ameren
      Energy Marketing Company, dated March 28,
2008
* Filed
herewith
-8-