UNITED STATES
                SECURITIES AND EXCHANGE COMMISSION

                      Washington, D.C. 20549

                      _______________________

                             FORM 8-K
                          CURRENT REPORT


                Pursuant to Section 13 or 15(d) of
                the Securities Exchange Act of 1934

                      _______________________


             Date of Report
             (Date of earliest
             event reported):   August 2, 2004


                 Interstate Power and Light Company
     ---------------------------------------------------------
      (Exact name of registrant as specified in its charter)


    Iowa                       0-4117-1                  42-0331370
- ----------------           -----------------         ------------------
(State or other            (Commission File             (IRS Employer
jurisdiction of                Number)               Identification No.)
incorporation)


                 200 First Street, SE, Cedar Rapids, Iowa 52401
          ------------------------------------------------------------
          (Address of principal executive offices, including zip code)


                          (319) 786-4411
                   -----------------------------
                  (Registrant's telephone number)






Item 5.    Other Events and Regulation FD Disclosure.
- ------     ------------------------------------------

           On August 2, 2004,  Interstate  Power and Light  Company
(the  "Company")  agreed to sell $25  million  aggregate  principal
amount  of  its  6.30%  senior  debentures  due  2034  in a  public
offering  through  Lehman  Brothers  Inc.,  Merrill Lynch & Co. and
Merrill  Lynch,  Pierce,   Fenner  &  Smith,   Incorporated.   This
offering is expected  to close on August 5, 2004.  The  offering is
a reopening  of the  Company's  series of 6.30%  senior  debentures
due 2034,  $100 million  aggregate  principal  amount of which were
sold on May 6, 2004.

           The senior  debentures  are  subject  to a  Registration
Statement  on Form  S-3  (Registration  No.  333-114065)  that  the
Company filed with the Securities and Exchange  Commission  ("SEC")
relating  to the  public  offering,  pursuant  to  Rule  415 of the
Securities  Act of 1933, as amended,  of up to an aggregate of $210
million  of  securities  of the  Company.  In  connection  with the
Company  filing with the SEC a  definitive  prospectus  supplement,
dated  July  28,  2004,  and  prospectus,  dated  April  15,  2004,
relating  to the public  offering  of senior  debentures  described
above,  the  Company  is filing  certain  exhibits  as part of this
Current  Report on Form  8-K.  See  "Item 7.  Financial  Statements
and Exhibits."


Item 7.    Financial Statements and Exhibits.
- -------    ----------------------------------

           (a)   Not applicable.

           (b)   Not applicable.

           (c)   Exhibits.  The following exhibits are being filed herewith:
                 --------

                (1.1)   Purchase  Agreement,  dated  August  2,  2004,
                        among  Interstate  Power and Light Company and
                        Lehman  Brothers  Inc.,  Merrill  Lynch  & Co.
                        and  Merrill  Lynch,  Pierce,  Fenner & Smith,
                        Incorporated.

                (4.1)   Officer's  Certificate,  dated August 2, 2004,
                        reopening  the  6.30%  Senior  Debentures  due
                        2034.

                (5)     Opinion of Foley & Lardner  LLP,  dated August
                        2, 2004.

                (23)    Consent of Foley & Lardner LLP  (contained  in
                        Exhibit (5) hereto).




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                            SIGNATURES
                            ----------

           Pursuant to the requirements of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this  report to be
signed on its behalf by the undersigned hereunto duly authorized.

                               INTERSTATE POWER AND LIGHT COMPANY



Date:  August 3, 2004                     By:   /s/ T. Hanson
                                             -------------------------------
                                                Thomas L. Hanson
                                                Vice President and Treasurer



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                INTERSTATE POWER AND LIGHT COMPANY

            Exhibit Index to Current Report on Form 8-K
                       Dated August 2, 2004


Exhibit
Number
- -------

(1.1)      Purchase   Agreement,   dated  August  2,  2004,   among
           Interstate  Power and Light Company and Lehman  Brothers
           Inc.,  Merrill  Lynch & Co. and Merrill  Lynch,  Pierce,
           Fenner & Smith, Incorporated.

(4.1)      Officer's  Certificate,  dated August 2, 2004, reopening
           the 6.30% Senior Debentures due 2034.

(5)        Opinion of Foley & Lardner LLP, dated August 2, 2004.

(23)       Consent of Foley & Lardner  LLP  (contained  in Exhibit
           (5) hereto).



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