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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>As filed with the
United States Securities and Exchange Commission on August 4, 2006</B> </FONT></H1>

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<P ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Registration No.
333-________</B> </FONT></P>

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>UNITED STATES<BR>SECURITIES AND
EXCHANGE COMMISSION<BR>Washington, D.C. 20549 </FONT></H1>

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     <P ALIGN=CENTER>_________________ </P>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=3>FORM S-8 <BR>REGISTRATION
STATEMENT<BR>Under<BR>THE SECURITIES ACT OF 1933 </FONT></P>

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     <P ALIGN=CENTER>_________________ </P>


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     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH></TR>
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     <TD WIDTH=100% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=3>ALLIANT ENERGY CORPORATION</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Exact name of registrant as specified in its charter)</FONT></TD></TR>
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     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Wisconsin</FONT></TD>
     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>39-1380265</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(State or other jurisdiction of</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(I.R.S. Employer</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>incorporation or organization)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>Identification No.)</FONT></TD></TR>
</TABLE>
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     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
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     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4902 North Biltmore Lane</FONT></TD>
     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Madison, Wisconsin</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>53718-2132</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(Address of principal executive offices)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(Zip Code)</FONT></TD></TR>
</TABLE>
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     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=100% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Alliant Energy Corporation Amended and Restated 2002 Equity Incentive Plan</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(Full title of the plan)</FONT></TD></TR>
</TABLE>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2> </FONT></P>

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     <P ALIGN=CENTER>_________________ </P>


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     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>F.J. Buri</FONT></TD>
     <TD WIDTH=50% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Copy to:</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Corporate Secretary</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Benjamin F. Garmer, III</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Alliant Energy Corporation</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Foley &amp; Lardner LLP</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>4902 North Biltmore Lane</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>777 East Wisconsin Avenue</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Madison, Wisconsin 53718-2132</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Milwaukee, Wisconsin 53202</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(608) 458-3311</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(414) 271-2400</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(Name, address and telephone number,</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>including area code, of agent for service)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
</TABLE>
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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CALCULATION OF REGISTRATION
FEE </FONT></P>

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<TR>
     <TD COLSPAN=5><HR NOSHADE COLOR=#000000 SIZE=2></TD></TR>
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     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Title of<BR>
Securities to be<BR>
Registered</FONT><HR WIDTH=100% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Amount<BR>
to be<BR>
Registered (1)</FONT><HR WIDTH=100% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Proposed Maximum<BR>
Offering Price<BR>
Per Share</FONT><HR WIDTH=100% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Proposed Maximum<BR>
Aggregate Offering<BR>
Price</FONT><HR WIDTH=100% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Amount of<BR>
Registration Fee</FONT><HR WIDTH=100% SIZE=1 COLOR=BLACK NOSHADE></TD></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=20% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;Common Stock,</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>2,000,000 shares</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$36.02(2)</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$72,040,000(2)</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$7,708.28</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;$.01 par value</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;Common Share</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>2,000,000 rights</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(3)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(3)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(3)</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;Purchase Rights</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR>
     <TD COLSPAN=5><HR NOSHADE COLOR=#000000 SIZE=2></TD></TR>
</TABLE>
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          <TR VALIGN=TOP>
          <TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(1)</FONT></TD>
          <TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          Pursuant to Rule 416 under the Securities Act of 1933, this Registration
          Statement also covers an indeterminate number of additional shares of Common
          Stock that may become issuable as a result of stock splits, stock dividends or
          similar transactions pursuant to the anti-dilution provisions of the Alliant
          Energy Corporation Amended and Restated 2002 Equity Incentive Plan. </FONT></TD>
          </TR>
          </TABLE>
          <BR>

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          <TR VALIGN=TOP>
          <TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(2)</FONT></TD>
          <TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          Estimated pursuant to Rule 457(c) and (h) under the Securities Act of 1933
          solely for the purpose of calculating the registration fee based on the average
          of the high and low prices for Alliant Energy Corporation Common Stock on the
          New York Stock Exchange on August 1, 2006. </FONT></TD>
          </TR>
          </TABLE>
          <BR>

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          <TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(3)</FONT></TD>
          <TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
          The value attributable to the Common Share Purchase Rights is reflected in the
          market price of the Common Stock to which the Rights are attached. </FONT></TD>
          </TR>
          </TABLE>
          <BR>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to Rule 429 under the Securities Act of 1933, as amended, the Prospectus referred to
herein also relates to the Registrant&#146;s Registration Statement on Form S-8
(Registration No. 333-88304). </FONT></P>



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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>STATEMENT PURSUANT TO
GENERAL INSTRUCTION E TO FORM S-8 </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
purpose of this Registration Statement is to register 2,000,000 additional shares of
Common Stock, $.01 par value per share, and associated Common Share Purchase Rights, of
Alliant Energy Corporation (the &#147;Company&#148;) in connection with the Alliant Energy
Corporation Amended and Restated 2002 Equity Incentive Plan. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to General Instruction E of Form S-8, the contents of the Company&#146;s Registration
Statement on Form S-8 (Registration No. 333-88304), including the documents incorporated
by reference therein, are incorporated by reference into this Registration Statement,
except as set forth below. </FONT></P>

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>PART II </FONT></H1>

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT </FONT></H1>

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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Item 8.</B> </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B><U>Exhibits</U>.</B> </FONT></TD>
</TR>
</TABLE>
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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
exhibits filed herewith or incorporated herein by reference are set forth in the attached
Exhibit Index. </FONT></P>

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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>Item 9.</B> </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B><U>Undertakings</U>.</B> </FONT></TD>
</TR>
</TABLE>
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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          The undersigned Registrant hereby undertakes: </FONT></P>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          To file, during any period in which offers or sales are being made, a
          post-effective amendment to this Registration Statement: </FONT></P>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;          To
include any prospectus required by Section 10(a)(3) of the Securities Act of
          1933;  </FONT></P></TD>
</TR>
</TABLE>
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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;         To
reflect in the prospectus any facts or events arising after the effective
               date of the Registration Statement (or the most recent post-effective
amendment                thereof) which, individually or in the aggregate, represent a
fundamental change                in the information set forth in the Registration
Statement;  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;               To
include any material information with respect to the plan of distribution not
               previously disclosed in the Registration Statement or any material change
to                such information in the Registration Statement;  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2><I>provided, however,</I> that
paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be
included in a post-effective amendment by those paragraphs is contained in periodic
reports filed with or furnished to the Commission by the Registrant pursuant to
Section&nbsp;13 or Section&nbsp;15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the Registration Statement. </FONT></P>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          That, for the purpose of determining any liability under the Securities Act of
          1933, each such post-effective amendment shall be deemed to be a new
          registration statement relating to the securities offered herein, and the
          offering of such securities at that time shall be deemed to be the initial bona
          fide offering thereof. </FONT></P>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          To remove from registration by means of a post-effective amendment any of the
          securities being registered which remain unsold at the termination of the
          offering. </FONT></P>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>2 </FONT></P>


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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          That, for the purpose of determining liability of the registrant under the
          Securities Act of 1933 to any purchaser in the initial distribution of the
          securities, in a primary offering of securities of the Registrant pursuant to
          this Registration Statement, regardless of the underwriting method used to sell
          the securities to the purchaser, if the securities are offered or sold to such
          purchaser by means of any of the following communications, the Registrant will
          be a seller to the purchaser and will be considered to offer or sell such
          securities to such purchaser: </FONT></P>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;               Any
preliminary prospectus or prospectus of the Registrant relating to the
               offering required to be filed pursuant to Rule 424 under the Securities
Act of                1933;  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;              Any
free writing prospectus relating to the offering prepared by or on behalf of
               the Registrant or used or referred to by the Registrant;  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&nbsp;            The
portion of any other free writing prospectus relating to the offering
               containing material information about the Registrant or its securities
provided                by or on behalf of the Registrant; and  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%></TD>
<TD WIDTH=95%><P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(iv)&nbsp;&nbsp;&nbsp;&nbsp;            Any
other communication that is an offer in the offering made by the Registrant
               to the purchaser.  </FONT></P></TD>
</TR>
</TABLE>
<BR>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          The undersigned Registrant hereby undertakes that, for purposes of determining
          any liability under the Securities Act of 1933, each filing of the
          Registrant&#146;s annual report pursuant to Section 13(a) or Section 15(d) of
          the Securities Exchange Act of 1934 that is incorporated by reference in this
          Registration Statement shall be deemed to be a new registration statement
          relating to the securities offered herein, and the offering of such securities
          at that time shall be deemed to be the initial bona fide offering thereof. </FONT></P>

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     <P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          Insofar as indemnification for liabilities arising under the Securities Act of
          1933 may be permitted to directors, officers and controlling persons of the
          Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
          has been advised that in the opinion of the Commission such indemnification is
          against public policy as expressed in the Act and is, therefore, unenforceable.
          In the event that a claim for indemnification against such liabilities (other
          than the payment by the Registrant of expenses incurred or paid by a director,
          officer or controlling person of the Registrant in the successful defense of any
          action, suit or proceeding) is asserted by such director, officer or controlling
          person in connection with the securities being registered, the Registrant will,
          unless in the opinion of its counsel the matter has been settled by controlling
          precedent, submit to a court of appropriate jurisdiction the question whether
          such indemnification by it is against public policy as expressed in the Act and
          will be governed by the final adjudication of such issue. </FONT></P>

<BR>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>3 </FONT></P>


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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>SIGNATURES</U> </FONT></H1>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on
Form&nbsp;S-8 and has duly caused this Registration Statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of Madison, State of Wisconsin,
on this 4<SUP>th</SUP> day of August, 2006. </FONT></P>


<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=50% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><B>ALLIANT ENERGY CORPORATION</B></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>By: <U>/s/ William D. Harvey</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;William D. Harvey</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Chairman, President and Chief Executive</I></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Officer</I></FONT></TD></TR>
</TABLE>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this Registration Statement has been
signed by the following persons in the capacities and on the dates indicated. </FONT></P>



<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Signature</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER ><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Title</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Date</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=40% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>/s/ William D. Harvey</U></FONT></TD>
     <TD WIDTH=30% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Chairman, President, Chief Executive</FONT></TD>
     <TD WIDTH=30% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>William D. Harvey</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Officer and Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Principal Executive Officer)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>/s/ Eliot G. Protsch</U></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Senior Executive Vice President and</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Eliot G. Protsch</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Chief Financial Officer</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Principal Financial Officer)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>/s/ John E. Kratchmer</U></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Vice President-Controller and Chief</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>John E. Kratchmer</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Accounting Officer</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(Principal Accounting Officer)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Michael L. Bennett</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Singleton B. McAllister</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Ann K. Newhall</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dean C. Oestreich</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
</TABLE>
<BR><BR>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>S-1 </FONT></P>




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<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Signature</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER ><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Title</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Date</FONT><HR WIDTH=20% SIZE=1 COLOR=BLACK NOSHADE></TD></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=40% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=30% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=30% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>David A. Perdue</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Judith D. Pyle</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Carol P. Sanders</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Director</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>August 4, 2006</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Anthony R. Weiler</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>*By: <U>/s/ William D. Harvey</U></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;William D. Harvey</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Attorney-in-Fact</I></FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD></TR>
</TABLE>
<BR><BR>



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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>S-2 </FONT></P>



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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>EXHIBIT INDEX </U></FONT></P>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR><U>Number</U>  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><U>Exhibit Description</U> </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.1)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Restated
Articles of Incorporation of Alliant Energy Corporation, as amended
                    (incorporated by reference to Exhibit 4.1 to the Company&#146;s
Registration                     Statement on Form S-8, dated July 26, 2004 (Registration
No. 333-117654)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.2)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Alliant
Energy Corporation Amended and Restated 2002 Equity Incentive Plan
                    (incorporated by reference to Appendix A to the Company&#146;s
definitive proxy                     statement filed on Schedule 14A on April 5, 2006
(File No. 1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.3)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form
of Nonqualified Stock Option Agreement pursuant to the Alliant Energy
                    Corporation Amended and Restated 2002 Equity Incentive Plan
(incorporated by                     reference to Exhibit 10.1 to the Company&#146;s Form
10-Q for the quarter ended                     September 30, 2004 (File No. 1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.4)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form
of Restricted Stock Agreement pursuant to the Alliant Energy Corporation
                    Amended and Restated 2002 Equity Incentive Plan (incorporated by
reference to                     Exhibit 10.2 to the Company&#146;s Form 10-Q for the
quarter ended September 30,                     2004 (File No. 1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.5)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form
of Performance Share Grant pursuant to the Alliant Energy Corporation
                    Amended and Restated 2002 Equity Incentive Plan (incorporated by
reference to                     Exhibit 10.3 to the Company&#146;s Form 10-Q for the
quarter ended September 30,                     2004 (File No. 1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.6)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Form
of Performance Contingent Restricted Stock Agreement pursuant to the
                    Alliant Energy Corporation Amended and Restated 2002 Equity Incentive
Plan                     (incorporated by reference to Exhibit 10.4 to the Company&#146;s
Form 10-Q for                     the quarter ended September 30, 2004 (File No.
1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(4.7)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Rights
Agreement, dated as of January 20, 1999, between Alliant Energy
                    Corporation and Wells Fargo Bank Minnesota, N.A., successor
(incorporated by                     reference to Exhibit 4.1 to the Company&#146;s
Registration Statement on Form                     8-A, dated January 20, 1999 (File No.
1-9894)). </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(5)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Opinion
of Foley &amp; Lardner LLP. </FONT></TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(23.1)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent
of Deloitte &amp; Touche LLP. </FONT></TD>
</TR>
</TABLE>
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<TD WIDTH=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(23.2)  </FONT></TD>
<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Consent
of Foley &amp; Lardner LLP (contained in Exhibit (5)). </FONT></TD>
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<TD WIDTH=90%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Powers
of Attorney. </FONT></TD>
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[{"type": "S-8", "sequence": "1", "filename": "dbk203.htm", "description": "REGISTRATION STATEMENT", "secsgml_size_bytes": 46433}]
{"company-data": {"conformed-name": "ALLIANT ENERGY CORP", "cik": "0000352541", "assigned-sic": "4931", "irs-number": "391380265", "state-of-incorporation": "WI", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-136311", "film-number": "061005725"}, "business-address": {"street1": "4902 NORTH BILTMORE LANE", "street2": "PO BOX 77007", "city": "MADISON", "state": "WI", "zip": "53707-1007", "phone": "608-458-3314"}, "mail-address": {"street1": "4902 NORTH BILTMORE LANE", "street2": "PO BOX 77007", "city": "MADISON", "state": "WI", "zip": "53707-1007"}, "former-company": [{"former-conformed-name": "INTERSTATE ENERGY CORP", "date-changed": "19980427"}, {"former-conformed-name": "WPL HOLDINGS INC", "date-changed": "19920703"}]}
As filed with the
United States Securities and Exchange Commission on August 4, 2006
Registration No.
333-________
UNITED STATES
SECURITIES AND
EXCHANGE COMMISSION
Washington, D.C. 20549
_________________
FORM S-8
REGISTRATION
STATEMENT
Under
THE SECURITIES ACT OF 1933
_________________
ALLIANT ENERGY CORPORATION
(Exact name of registrant as specified in its charter)
Wisconsin
39-1380265
(State or other jurisdiction of
(I.R.S. Employer
incorporation or organization)
Identification No.)
4902 North Biltmore Lane
Madison, Wisconsin
53718-2132
(Address of principal executive offices)
(Zip Code)
Alliant Energy Corporation Amended and Restated 2002 Equity Incentive Plan
(Full title of the plan)
_________________
F.J. Buri
Copy to:
Corporate Secretary
Benjamin F. Garmer, III
Alliant Energy Corporation
Foley & Lardner LLP
4902 North Biltmore Lane
777 East Wisconsin Avenue
Madison, Wisconsin 53718-2132
Milwaukee, Wisconsin 53202
(608) 458-3311
(414) 271-2400
(Name, address and telephone number,
including area code, of agent for service)
CALCULATION OF REGISTRATION
FEE
Title of
Securities to be
Registered
Amount
to be
Registered (1)
Proposed Maximum
Offering Price
Per Share
Proposed Maximum
Aggregate Offering
Price
Amount of
Registration Fee
Common Stock,
2,000,000 shares
$36.02(2)
$72,040,000(2)
$7,708.28
$.01 par value
Common Share
2,000,000 rights
(3)
(3)
(3)
Purchase Rights
(1)
Pursuant to Rule 416 under the Securities Act of 1933, this Registration
          Statement also covers an indeterminate number of additional shares of Common
          Stock that may become issuable as a result of stock splits, stock dividends or
          similar transactions pursuant to the anti-dilution provisions of the Alliant
          Energy Corporation Amended and Restated 2002 Equity Incentive Plan.
(2)
Estimated pursuant to Rule 457(c) and (h) under the Securities Act of 1933
          solely for the purpose of calculating the registration fee based on the average
          of the high and low prices for Alliant Energy Corporation Common Stock on the
          New York Stock Exchange on August 1, 2006.
(3)
The value attributable to the Common Share Purchase Rights is reflected in the
          market price of the Common Stock to which the Rights are attached.
Pursuant
to Rule 429 under the Securities Act of 1933, as amended, the Prospectus referred to
herein also relates to the Registrant's Registration Statement on Form S-8
(Registration No. 333-88304).
STATEMENT PURSUANT TO
GENERAL INSTRUCTION E TO FORM S-8
The
purpose of this Registration Statement is to register 2,000,000 additional shares of
Common Stock, $.01 par value per share, and associated Common Share Purchase Rights, of
Alliant Energy Corporation (the "Company") in connection with the Alliant Energy
Corporation Amended and Restated 2002 Equity Incentive Plan.
Pursuant
to General Instruction E of Form S-8, the contents of the Company's Registration
Statement on Form S-8 (Registration No. 333-88304), including the documents incorporated
by reference therein, are incorporated by reference into this Registration Statement,
except as set forth below.
PART II
INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT
Item 8.
Exhibits
.
The
exhibits filed herewith or incorporated herein by reference are set forth in the attached
Exhibit Index.
Item 9.
Undertakings
.
(a)       
          The undersigned Registrant hereby undertakes:
(1)       
          To file, during any period in which offers or sales are being made, a
          post-effective amendment to this Registration Statement:
(i)              To
include any prospectus required by Section 10(a)(3) of the Securities Act of
          1933;
(ii)             To
reflect in the prospectus any facts or events arising after the effective
               date of the Registration Statement (or the most recent post-effective
amendment                thereof) which, individually or in the aggregate, represent a
fundamental change                in the information set forth in the Registration
Statement;
(iii)                   To
include any material information with respect to the plan of distribution not
               previously disclosed in the Registration Statement or any material change
to                such information in the Registration Statement;
provided, however,
that
paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be
included in a post-effective amendment by those paragraphs is contained in periodic
reports filed with or furnished to the Commission by the Registrant pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the Registration Statement.
(2)       
          That, for the purpose of determining any liability under the Securities Act of
          1933, each such post-effective amendment shall be deemed to be a new
          registration statement relating to the securities offered herein, and the
          offering of such securities at that time shall be deemed to be the initial bona
          fide offering thereof.
(3)       
          To remove from registration by means of a post-effective amendment any of the
          securities being registered which remain unsold at the termination of the
          offering.
2
(4)       
          That, for the purpose of determining liability of the registrant under the
          Securities Act of 1933 to any purchaser in the initial distribution of the
          securities, in a primary offering of securities of the Registrant pursuant to
          this Registration Statement, regardless of the underwriting method used to sell
          the securities to the purchaser, if the securities are offered or sold to such
          purchaser by means of any of the following communications, the Registrant will
          be a seller to the purchaser and will be considered to offer or sell such
          securities to such purchaser:
(i)                   Any
preliminary prospectus or prospectus of the Registrant relating to the
               offering required to be filed pursuant to Rule 424 under the Securities
Act of                1933;
(ii)                  Any
free writing prospectus relating to the offering prepared by or on behalf of
               the Registrant or used or referred to by the Registrant;
(iii)                The
portion of any other free writing prospectus relating to the offering
               containing material information about the Registrant or its securities
provided                by or on behalf of the Registrant; and
(iv)                Any
other communication that is an offer in the offering made by the Registrant
               to the purchaser.
(b)       
          The undersigned Registrant hereby undertakes that, for purposes of determining
          any liability under the Securities Act of 1933, each filing of the
          Registrant's annual report pursuant to Section 13(a) or Section 15(d) of
          the Securities Exchange Act of 1934 that is incorporated by reference in this
          Registration Statement shall be deemed to be a new registration statement
          relating to the securities offered herein, and the offering of such securities
          at that time shall be deemed to be the initial bona fide offering thereof.
(c)       
          Insofar as indemnification for liabilities arising under the Securities Act of
          1933 may be permitted to directors, officers and controlling persons of the
          Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
          has been advised that in the opinion of the Commission such indemnification is
          against public policy as expressed in the Act and is, therefore, unenforceable.
          In the event that a claim for indemnification against such liabilities (other
          than the payment by the Registrant of expenses incurred or paid by a director,
          officer or controlling person of the Registrant in the successful defense of any
          action, suit or proceeding) is asserted by such director, officer or controlling
          person in connection with the securities being registered, the Registrant will,
          unless in the opinion of its counsel the matter has been settled by controlling
          precedent, submit to a court of appropriate jurisdiction the question whether
          such indemnification by it is against public policy as expressed in the Act and
          will be governed by the final adjudication of such issue.
3
SIGNATURES
Pursuant
to the requirements of the Securities Act of 1933, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on
Form S-8 and has duly caused this Registration Statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of Madison, State of Wisconsin,
on this 4
th
day of August, 2006.
ALLIANT ENERGY CORPORATION
By:
/s/ William D. Harvey
William D. Harvey
Chairman, President and Chief Executive
Officer
Pursuant
to the requirements of the Securities Act of 1933, this Registration Statement has been
signed by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/ William D. Harvey
Chairman, President, Chief Executive
August 4, 2006
William D. Harvey
Officer and Director
(Principal Executive Officer)
/s/ Eliot G. Protsch
Senior Executive Vice President and
August 4, 2006
Eliot G. Protsch
Chief Financial Officer
(Principal Financial Officer)
/s/ John E. Kratchmer
Vice President-Controller and Chief
August 4, 2006
John E. Kratchmer
Accounting Officer
(Principal Accounting Officer)
*
Director
August 4, 2006
Michael L. Bennett
*
Director
August 4, 2006
Singleton B. McAllister
*
Director
August 4, 2006
Ann K. Newhall
*
Director
August 4, 2006
Dean C. Oestreich
S-1
Signature
Title
Date
*
Director
August 4, 2006
David A. Perdue
*
Director
August 4, 2006
Judith D. Pyle
*
Director
August 4, 2006
Carol P. Sanders
*
Director
August 4, 2006
Anthony R. Weiler
*By:
/s/ William D. Harvey
William D. Harvey
Attorney-in-Fact
S-2
EXHIBIT INDEX
Exhibit
Number
Exhibit Description
(4.1)
Restated
Articles of Incorporation of Alliant Energy Corporation, as amended
                    (incorporated by reference to Exhibit 4.1 to the Company's
Registration                     Statement on Form S-8, dated July 26, 2004 (Registration
No. 333-117654)).
(4.2)
Alliant
Energy Corporation Amended and Restated 2002 Equity Incentive Plan
                    (incorporated by reference to Appendix A to the Company's
definitive proxy                     statement filed on Schedule 14A on April 5, 2006
(File No. 1-9894)).
(4.3)
Form
of Nonqualified Stock Option Agreement pursuant to the Alliant Energy
                    Corporation Amended and Restated 2002 Equity Incentive Plan
(incorporated by                     reference to Exhibit 10.1 to the Company's Form
10-Q for the quarter ended                     September 30, 2004 (File No. 1-9894)).
(4.4)
Form
of Restricted Stock Agreement pursuant to the Alliant Energy Corporation
                    Amended and Restated 2002 Equity Incentive Plan (incorporated by
reference to                     Exhibit 10.2 to the Company's Form 10-Q for the
quarter ended September 30,                     2004 (File No. 1-9894)).
(4.5)
Form
of Performance Share Grant pursuant to the Alliant Energy Corporation
                    Amended and Restated 2002 Equity Incentive Plan (incorporated by
reference to                     Exhibit 10.3 to the Company's Form 10-Q for the
quarter ended September 30,                     2004 (File No. 1-9894)).
(4.6)
Form
of Performance Contingent Restricted Stock Agreement pursuant to the
                    Alliant Energy Corporation Amended and Restated 2002 Equity Incentive
Plan                     (incorporated by reference to Exhibit 10.4 to the Company's
Form 10-Q for                     the quarter ended September 30, 2004 (File No.
1-9894)).
(4.7)
Rights
Agreement, dated as of January 20, 1999, between Alliant Energy
                    Corporation and Wells Fargo Bank Minnesota, N.A., successor
(incorporated by                     reference to Exhibit 4.1 to the Company's
Registration Statement on Form                     8-A, dated January 20, 1999 (File No.
1-9894)).
(5)
Opinion
of Foley & Lardner LLP.
(23.1)
Consent
of Deloitte & Touche LLP.
(23.2)
Consent
of Foley & Lardner LLP (contained in Exhibit (5)).
(24)
Powers
of Attorney.
E-1