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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>As filed with the
Securities and Exchange Commission on July 26, 2004 </FONT></H1>

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<P ALIGN=RIGHT><FONT FACE="Times New Roman, Times, Serif" SIZE=1><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=2>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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<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>ALLIANT ENERGY CORPORATION</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=1>(Exact name of registrant as specified in its charter)</FONT></TD></TR>
</TABLE>
<BR>




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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>
<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>4902 North Biltmore Lane</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>
<BR>


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<TR VALIGN=Bottom>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Alliant Energy Corporation 401(k) Savings 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>
<BR>


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     <P ALIGN=CENTER>_________________ </P>


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     <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></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>Benjamin F. Garmer, III</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>Jay O. Rothman</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>Foley &amp; Lardner LLP</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>777 East Wisconsin Avenue</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>Milwaukee, Wisconsin 53202-5306</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>(414) 271-2400</FONT></TD></TR>
</TABLE>
<BR>


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     <P ALIGN=CENTER>_________________ </P>

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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 WIDTH=100% SIZE=2 COLOR=BLACK NOSHADE></TD></TR>
<TR VALIGN=Bottom>
     <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</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=22% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Common Stock,</FONT></TD>
     <TD WIDTH=22% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>1,600,000 shares</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$26.49 (1)</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$42,384,000 (1)</FONT></TD>
     <TD WIDTH=20% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$5,370.06</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$.01 par value</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>Common Share</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>1,600,000 rights</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(2)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(2)</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(2)</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Purchase Rights</FONT></TD></TR>
<TR>
     <TD COLSPAN=5><HR WIDTH=100% SIZE=2 COLOR=BLACK NOSHADE></TD></TR>
</TABLE>



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          <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>
          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 Composite Tape on July 23, 2004. </FONT></TD>
          </TR>
          </TABLE>
          <BR>

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          <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>
          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 ALIGN=CENTER>_________________ </P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>In addition, pursuant to Rule 416(c)
under the Securities Act of 1933, this Registration Statement also covers an indeterminate
amount of interests to be offered or sold pursuant to the employee benefit plan described
herein. </FONT></P>



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

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<H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>INFORMATION REQUIRED
IN THE SECTION 10(a) PROSPECTUS </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
document or documents containing the information specified in Part I are not required to
be filed with the Securities and Exchange Commission (the &#147;Commission&#148;) as part
of this Registration Statement on Form&nbsp;S-8. </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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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 3.&nbsp;&nbsp;&nbsp;&nbsp;<U>Incorporation of
Documents by Reference</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;The
following documents filed with the Commission by Alliant Energy Corporation (the
&#147;Company&#148;) or the Alliant Energy Corporation 401(k) Savings Plan (the
&#147;Plan&#148;) are hereby incorporated herein by reference: </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
Company&#146;s Annual Report on Form 10-K for the fiscal year ended December
          31, 2003.  </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
Plan&#146;s Annual Report on Form 11-K for the fiscal year ended December           31,
2003.  </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
Company&#146;s Quarterly Report on Form 10-Q for the quarter ended March 31,
          2004.  </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
description of the Company&#146;s Common Stock contained in Item 4 of the
          Company&#146;s Registration Statement on Form 8-B, dated April 1, 1988,
          including any amendment or report filed for the purpose of updating such
          description.  </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          The
description of the Company&#146;s Common Share Purchase Rights contained in
          Item 1 of the Company&#146;s Registration Statement on Form 8-A, dated January
          20, 1999, including any amendment or report filed for the purpose of updating
          such description.  </FONT></P>



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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
documents subsequently filed by the Company or the Plan pursuant to Sections 13(a), 13(c),
14 or 15(d) of the Securities Exchange Act of 1934, as amended, after the date of filing
of this Registration Statement and prior to such time as the Company files a
post-effective amendment to this Registration Statement which indicates that all
securities offered hereby have been sold or which deregisters all securities then
remaining unsold shall be deemed to be incorporated by reference in this Registration
Statement and to be a part hereof from the date of filing of such documents. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 4.&nbsp;&nbsp;&nbsp;&nbsp;<U>Description of
Securities</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;Not
applicable. </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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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 5.&nbsp;&nbsp;&nbsp;&nbsp;<U>Interests of
Named Experts and Counsel</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;None. </FONT></P>



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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 6.&nbsp;&nbsp;&nbsp;&nbsp;<U>Indemnification
of Directors and Officers</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 Wisconsin Business Corporation Law and the Company&#146;s By-laws, as amended,
directors and officers of the Company are entitled to mandatory indemnification from the
Company against certain liabilities and expenses (i) to the extent such officers or
directors are successful in the defense of a proceeding and (ii) in proceedings in which
the director or officer is not successful in the defense thereof, unless it is determined
that the director or officer breached or failed to perform his or her duties to the
Company and such breach or failure constituted: (a) a willful failure to deal fairly with
the Company or its shareowners in connection with a matter in which the director or
officer had a material conflict of interest; (b) a violation of the criminal law, unless
the director or officer had reasonable cause to believe his or her conduct was lawful or
had no reasonable cause to believe his or her conduct was unlawful; (c) a transaction from
which the director or officer derived an improper personal profit; or (d) willful
misconduct. The Wisconsin Business Corporation Law specifically states that it is the
policy of Wisconsin to require or permit indemnification in connection with a proceeding
involving securities regulation, as described therein, to the extent required or permitted
as described above. Additionally, under the Wisconsin Business Corporation Law, directors
of the Company are not subject to personal liability to the Company, its shareowners or
any person asserting rights on behalf thereof for certain breaches or failures to perform
any duty resulting solely from their status as directors except in circumstances
paralleling those in subparagraphs (a) through (d) outlined above. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
indemnification provided by the Wisconsin Business Corporation Law and the Company&#146;s
By-laws is not exclusive of any other rights to which a director or officer may be
entitled. The general effect of the foregoing provisions may be to reduce the
circumstances which an officer or director may be required to bear the economic burden of
the foregoing liabilities and expenses. </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company maintains a liability insurance policy for its directors and officers as permitted
by Wisconsin law which may extend to, among other things, liability arising under the
Securities Act of 1933, as amended. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 7.&nbsp;&nbsp;&nbsp;&nbsp;<U>Exemption from
Registration Claimed</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;Not
applicable. </FONT></P>



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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 8.&nbsp;&nbsp;&nbsp;&nbsp;<U>Exhibits</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;The
exhibits filed herewith or incorporated herein by reference are set forth in the attached
Exhibit Index. </FONT></P>


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

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
undersigned Registrant hereby undertakes that it has submitted or will submit the Plan,
and any amendment thereto, to the Internal Revenue Service (&#147;IRS&#148;) in a timely
manner and has made or will make all changes required by the IRS in order to continue the
qualification of the Plan under Section 401 of the Internal Revenue Code of 1986, as
amended. </FONT></P>

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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item 9.&nbsp;&nbsp;&nbsp;&nbsp;<U>Undertakings</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;(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;&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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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          To
include any prospectus required by Section 10(a)(3) of the Securities Act of
          1933;  </FONT>
</TD>
</TR>
</TABLE>
<BR>

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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&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>
</TD>
</TR>
</TABLE>
<BR>

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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;&nbsp;&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>
</TD>
</TR>
</TABLE>
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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;&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;&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><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&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 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>-4- </FONT></P>

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<P><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&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>


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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>-5- </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 26th&nbsp;day of &nbsp;July, 2004. </FONT></P>


<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<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><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>By:&nbsp;&nbsp;<U>/s/ Erroll B. Davis, Jr.</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;&nbsp;Erroll B. Davis, Jr.</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;&nbsp;Chairman and Chief Executive Officer</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 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><U>Signature</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Title</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Date</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=26% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR><U>/s/ Erroll B. Davis, Jr</U></FONT></TD>
     <TD WIDTH=34% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Chairman and Chief Executive Officer</FONT></TD>
     <TD WIDTH=40% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Erroll B. Davis, Jr</FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>and Director (Principal Executive</FONT></TD></TR>
<TR VALIGN=Bottom>
     <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>Officer)</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=CENTER><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>July 26, 2004</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=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Chief Financial Officer (Principal</FONT></TD></TR>
<TR VALIGN=Bottom>
     <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>Financial Officer)</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=CENTER><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>July 26, 2004</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=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Accounting Officer (Principal</FONT></TD></TR>
<TR VALIGN=Bottom>
     <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>Accounting Officer)</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Michael L. Bennett</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Jack B. Evans</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Katharine C. Lyall</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Singleton B. McAllister</FONT></TD></TR>
</table>
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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><U>Signature</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Title</U></FONT></TD>
     <TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Date</U></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=26% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;</FONT></TD>
     <TD WIDTH=34% ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TD>
     <TD WIDTH=40% 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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Ann K. Newhall</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>David A. Perdue</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Judith D. Pyle</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Robert W. Schlutz</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*</FONT><HR SIZE=1 ALIGN=LEFT WIDTH=40% COLOR=BLACK NOSHADE></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>July 26, 2004</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Anthony R. Weiler</FONT></TD></TR>
</TABLE>
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<TD WIDTH=5%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>                                          *By:  </FONT></TD>
<TD WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Erroll B. Davis, Jr.</U> <BR>Erroll B. Davis, Jr.
                                                  <BR>Attorney-in-Fact</FONT></TD>
</TR>
</TABLE>
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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><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 Alliant Energy Corporation Employee
Total Compensation Committee, which administers the Plan, has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Madison and State of Wisconsin, on this 26th day of July, 2004. </FONT></P>


<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=100%>
<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><B>401(k) SAVING PLAN</B></FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Jonathan Day</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>Jonathan Day</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ John E. Kratchmer</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>John E. Kratchmer</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Eric D. Mott</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>Eric D. Mott</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Joel Schmidt</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>Joel Schmidt</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Joan Thompson</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>Joan Thompson</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><BR><BR>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The foregoing persons are all of the members of the Alliant Energy</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>Corporation Employee Total Compensation Committee which is the current</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>administrator of the Alliant Energy Corporation 401(k) Savings Plan.</FONT></TD></TR>
</TABLE>

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<P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>S-3 </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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<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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exhibit
Description</U></FONT></TD>
</TR>
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<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. </FONT></TD>
</TR>
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<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 401(k) Savings Plan, as amended (incorporated by reference to Exhibit
4.2 to the                   Company's Registration Statement on Form S-8, dated May 15,
2002 (File No. 333-88306)).</FONT></TD>
</TR>
</TABLE>
<BR>

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<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>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)).</FONT></TD>
</TR>
</TABLE>
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<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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<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>
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<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=10%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(24)  </FONT></TD>
<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": "cmw829.htm", "description": "REGISTRATION STATEMENT", "secsgml_size_bytes": 47417}]
{"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": "333-117654", "film-number": "04930925"}, "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
Securities and Exchange Commission on July 26, 2004
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 401(k) Savings Plan
(Full title of the plan)
_________________
F.J. Buri
Copy to:
Corporate Secretary
Alliant Energy Corporation
Benjamin F. Garmer, III
4902 North Biltmore Lane
Jay O. Rothman
Madison, Wisconsin 53718-2132
Foley & Lardner LLP
(608) 458-3311
777 East Wisconsin Avenue
(Name, address and telephone number,
Milwaukee, Wisconsin 53202-5306
including area code, of agent for service)
(414) 271-2400
_________________
CALCULATION OF REGISTRATION
FEE
Title of
Securities to be
Registered
Amount
to be
Registered
Proposed Maximum
Offering Price
Per Share
Proposed Maximum
Aggregate Offering
Price
Amount of
Registration Fee
Common Stock,
1,600,000 shares
$26.49 (1)
$42,384,000 (1)
$5,370.06
$.01 par value
Common Share
1,600,000 rights
(2)
(2)
(2)
Purchase Rights
(1)
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 Composite Tape on July 23, 2004.
(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.
_________________
In addition, pursuant to Rule 416(c)
under the Securities Act of 1933, this Registration Statement also covers an indeterminate
amount of interests to be offered or sold pursuant to the employee benefit plan described
herein.
PART I
INFORMATION REQUIRED
IN THE SECTION 10(a) PROSPECTUS
The
document or documents containing the information specified in Part I are not required to
be filed with the Securities and Exchange Commission (the "Commission") as part
of this Registration Statement on Form S-8.
PART II
INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT
Item 3.
Incorporation of
Documents by Reference
.
The
following documents filed with the Commission by Alliant Energy Corporation (the
"Company") or the Alliant Energy Corporation 401(k) Savings Plan (the
"Plan") are hereby incorporated herein by reference:
1.                 The
Company's Annual Report on Form 10-K for the fiscal year ended December
          31, 2003.
2.                 The
Plan's Annual Report on Form 11-K for the fiscal year ended December           31,
2003.
3.                 The
Company's Quarterly Report on Form 10-Q for the quarter ended March 31,
          2004.
4.                 The
description of the Company's Common Stock contained in Item 4 of the
          Company's Registration Statement on Form 8-B, dated April 1, 1988,
          including any amendment or report filed for the purpose of updating such
          description.
5.                 The
description of the Company's Common Share Purchase Rights contained in
          Item 1 of the Company's Registration Statement on Form 8-A, dated January
          20, 1999, including any amendment or report filed for the purpose of updating
          such description.
All
documents subsequently filed by the Company or the Plan pursuant to Sections 13(a), 13(c),
14 or 15(d) of the Securities Exchange Act of 1934, as amended, after the date of filing
of this Registration Statement and prior to such time as the Company files a
post-effective amendment to this Registration Statement which indicates that all
securities offered hereby have been sold or which deregisters all securities then
remaining unsold shall be deemed to be incorporated by reference in this Registration
Statement and to be a part hereof from the date of filing of such documents.
Item 4.
Description of
Securities
.
Not
applicable.
-2-
Item 5.
Interests of
Named Experts and Counsel
.
None.
Item 6.
Indemnification
of Directors and Officers
.
Pursuant
to the Wisconsin Business Corporation Law and the Company's By-laws, as amended,
directors and officers of the Company are entitled to mandatory indemnification from the
Company against certain liabilities and expenses (i) to the extent such officers or
directors are successful in the defense of a proceeding and (ii) in proceedings in which
the director or officer is not successful in the defense thereof, unless it is determined
that the director or officer breached or failed to perform his or her duties to the
Company and such breach or failure constituted: (a) a willful failure to deal fairly with
the Company or its shareowners in connection with a matter in which the director or
officer had a material conflict of interest; (b) a violation of the criminal law, unless
the director or officer had reasonable cause to believe his or her conduct was lawful or
had no reasonable cause to believe his or her conduct was unlawful; (c) a transaction from
which the director or officer derived an improper personal profit; or (d) willful
misconduct. The Wisconsin Business Corporation Law specifically states that it is the
policy of Wisconsin to require or permit indemnification in connection with a proceeding
involving securities regulation, as described therein, to the extent required or permitted
as described above. Additionally, under the Wisconsin Business Corporation Law, directors
of the Company are not subject to personal liability to the Company, its shareowners or
any person asserting rights on behalf thereof for certain breaches or failures to perform
any duty resulting solely from their status as directors except in circumstances
paralleling those in subparagraphs (a) through (d) outlined above.
The
indemnification provided by the Wisconsin Business Corporation Law and the Company's
By-laws is not exclusive of any other rights to which a director or officer may be
entitled. The general effect of the foregoing provisions may be to reduce the
circumstances which an officer or director may be required to bear the economic burden of
the foregoing liabilities and expenses.
The
Company maintains a liability insurance policy for its directors and officers as permitted
by Wisconsin law which may extend to, among other things, liability arising under the
Securities Act of 1933, as amended.
Item 7.
Exemption from
Registration Claimed
.
Not
applicable.
Item 8.
Exhibits
.
The
exhibits filed herewith or incorporated herein by reference are set forth in the attached
Exhibit Index.
-3-
The
undersigned Registrant hereby undertakes that it has submitted or will submit the Plan,
and any amendment thereto, to the Internal Revenue Service ("IRS") in a timely
manner and has made or will make all changes required by the IRS in order to continue the
qualification of the Plan under Section 401 of the Internal Revenue Code of 1986, as
amended.
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.
(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.
-4-
(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.
-5-
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 26th day of  July, 2004.
ALLIANT ENERGY CORPORATION
By:
/s/ Erroll B. Davis, Jr.
Erroll B. Davis, Jr.
Chairman 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/ Erroll B. Davis, Jr
Chairman and Chief Executive Officer
July 26, 2004
Erroll B. Davis, Jr
and Director (Principal Executive
Officer)
/s/ Eliot G. Protsch
Senior Executive Vice President and
July 26, 2004
Eliot G. Protsch
Chief Financial Officer (Principal
Financial Officer)
/s/ John E. Kratchmer
Vice President-Controller and Chief
July 26, 2004
John E. Kratchmer
Accounting Officer (Principal
Accounting Officer)
*
Director
July 26, 2004
Michael L. Bennett
*
Director
July 26, 2004
Jack B. Evans
*
Director
July 26, 2004
Katharine C. Lyall
*
Director
July 26, 2004
Singleton B. McAllister
S-1
Signature
Title
Date
*
Director
July 26, 2004
Ann K. Newhall
*
Director
July 26, 2004
David A. Perdue
*
Director
July 26, 2004
Judith D. Pyle
*
Director
July 26, 2004
Robert W. Schlutz
*
Director
July 26, 2004
Anthony R. Weiler
*By:
/s/ Erroll B. Davis, Jr.
Erroll B. Davis, Jr.
Attorney-in-Fact
S-2
Pursuant
to the requirements of the Securities Act of 1933, the Alliant Energy Corporation Employee
Total Compensation Committee, which administers the Plan, has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Madison and State of Wisconsin, on this 26th day of July, 2004.
ALLIANT ENERGY CORPORATION
401(k) SAVING PLAN
/s/ Jonathan Day
Jonathan Day
/s/ John E. Kratchmer
John E. Kratchmer
/s/ Eric D. Mott
Eric D. Mott
/s/ Joel Schmidt
Joel Schmidt
/s/ Joan Thompson
Joan Thompson
The foregoing persons are all of the members of the Alliant Energy
Corporation Employee Total Compensation Committee which is the current
administrator of the Alliant Energy Corporation 401(k) Savings Plan.
S-3
EXHIBIT INDEX
Exhibit
Number
Exhibit
Description
(4.1)
Restated
Articles of Incorporation of Alliant Energy Corporation, as amended.
(4.2)
Alliant
Energy Corporation 401(k) Savings Plan, as amended (incorporated by reference to Exhibit
4.2 to the                   Company's Registration Statement on Form S-8, dated May 15,
2002 (File No. 333-88306)).
(4.3)
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