WISCONSIN POWER & LIGHT CO
S-3/A, 2000-02-25
ELECTRIC & OTHER SERVICES COMBINED
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                                                      Registration No. 333-87883
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                        --------------------------------
                               AMENDMENT NO. 1 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933
                        --------------------------------

                        WISCONSIN POWER AND LIGHT COMPANY
             (Exact name of registrant as specified in its charter)

                  Wisconsin                             39-0714890
     (State or other jurisdiction of                (I.R.S. Employer
      incorporation or organization)               Identification No.)

                           222 West Washington Avenue
                            Madison, Wisconsin 53703
                                 (608) 252-3311
(Address,  including zip code,  and telephone  number,  including  area code, of
registrant's principal executive offices)

                        --------------------------------
                                Edward M. Gleason
                Vice President-Treasurer and Corporate Secretary
                        Wisconsin Power and Light Company
                           222 West Washington Avenue
                            Madison, Wisconsin 53703
                                 (608) 252-3311

(Name, address,  including zip code, and telephone number,  including area code,
of agent for service)

                        --------------------------------
                                 with a copy to:

      Benjamin F. Garmer, III, Esq.                  William M. Libit, Esq.
             Foley & Lardner                          Chapman and Cutler
        777 East Wisconsin Avenue                   111 West Monroe Street
       Milwaukee, Wisconsin 53202                  Chicago, Illinois 60603
              (414) 271-2400                            (312) 845-3000

                        --------------------------------

     Approximate date of commencement of proposed sale to the public: As soon as
practicable after this registration statement becomes effective.

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box. |_|

     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. |_|

     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_|

     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box.|_|

                        --------------------------------

     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933 or until this  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

================================================================================

<PAGE>

                    Subject to Completion - February 25, 2000
- --------------------------------------------------------------------------------

     Prospectus                   $100,000,000

                        Wisconsin Power and Light Company

                          % Debentures due           ,

- --------------------------------------------------------------------------------

Wisconsin Power and Light Company       The Offering

o    We are a public utility engaged    o    We are offering $100,000,000 of
     mainly in the generation,               our unsecured debentures that
     transmission, distribution and          will rank on a parity with our
     sale of electric energy and the         other unsecured and
     purchase, distribution,                 unsubordinated debt.
     transportation and sale of
     natural gas.                       o    The debentures are due on        .
                                             We will pay interest on the
o    Wisconsin Power and Light Company       debentures twice per year, on
     222 West Washington Avenue                     and         of each year,
     Madison, Wisconsin 53703                beginning on      , 2000.
     (608) 252-3311
                                        o    We cannot redeem the debentures
PSCW Approval                                before they mature.  The
                                             debentures will not be subject
o    The Public Service Commission           to any sinking fund.
     of Wisconsin has approved our
     issuance and sale of the
     debentures.


- --------------------------------------------------------------------------------

                                            Per Debenture           Total
                                            -------------           -----
Public Offering Price.................             %           $
Underwriting Discount.................             %           $
Proceeds to WP&L......................             %           $

     The public offering price does not include accrued  interest,  if any, from
the date of issuance.  The proceeds to WP&L do not include expenses we must pay,
which we estimate will be approximately $175,000.

     Neither the  Securities and Exchange  Commission  nor any state  securities
commission  has approved  these  securities or determined if this  prospectus is
accurate or adequate. Any representation to the contrary is a criminal offense.

- --------------------------------------------------------------------------------

Robert W. Baird & Co.

             Banc One Capital Markets, Inc.

                                Legg Mason Wood Walker
                                         Incorporated

                                                       Wachovia Securities, Inc.

     , 2000

     The underwriters  intend to offer the debentures  subject to prior sale and
certain other  conditions.  They reserve the right to change their offers and to
reject orders in whole or in part. We expect to deliver the  debentures  through
the book-entry  facilities of The Depository Trust Company ("DTC")  on  or about
         , 2000, in return for payment therefor.

<PAGE>

     The information in this  prospectus is not complete and may be changed.  We
may not sell these securities  until the  registration  statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to  sell  these  securities  and it is not  soliciting  an  offer  to buy  these
securities in any state where the offer or sale is not permitted.

<PAGE>

                                -----------------

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

THE COMPANY....................................................................3

USE OF PROCEEDS................................................................3

SELECTED FINANCIAL INFORMATION.................................................4

RECENT DEVELOPMENTS............................................................5

DESCRIPTION OF THE DEBENTURES..................................................5

BOOK-ENTRY ONLY SYSTEM.........................................................9

UNDERWRITING..................................................................10

LEGAL OPINIONS................................................................11

EXPERTS.......................................................................11

WHERE YOU CAN FIND MORE INFORMATION...........................................11

DOCUMENTS INCORPORATED BY REFERENCE...........................................11


                                -----------------




                                       2
<PAGE>

                                   THE COMPANY

     We  are  a  Wisconsin  corporation  and  a  subsidiary  of  Alliant  Energy
Corporation.  We  are  a  public  utility  engaged  mainly  in  the  generation,
transmission,  distribution  and sale of electric energy in portions of southern
and central Wisconsin. We also purchase, distribute,  transport and sell natural
gas in parts of those areas,  and supply water to two  communities in Wisconsin.
Our wholly owned  subsidiary  also  supplies  electric,  gas and water  service,
principally in Winnebago County, Illinois.

     We provide  electricity  in a service  territory  of  approximately  16,000
square miles. As of December 31, 1998, we furnished  retail electric  service to
approximately  401,000  customers  in 599 cities,  villages  and towns.  We also
supplied  wholesale  electric service to 24 municipal  utilities,  one privately
owned utility, three rural electric cooperatives, one Native American nation and
one municipal  electric utility which provides retail service to 14 communities.
During 1998, we derived our electric operating revenues from the following types
of customers:

                    o  residential- 32%
                    o  commercial- 18%
                    o  industrial- 26%
                    o  sales for resale- 21%
                    o  other- 3%.

     The maximum net hourly peak load on our  electric  system in 1998 was 2,292
megawatts.  During 1998, our net kilowatt-hour  sources of electricity consisted
of the following:

                    o  steam- 61%
                    o  nuclear- 10%
                    o  hydroelectric and oil - 2%
                    o  purchases- 27%.

     As of  December  31,  1998,  we  provided  retail  natural  gas  service to
approximately  159,000  customers in 233 cities,  villages and towns in southern
and central  Wisconsin  and one county in northern  Illinois.  During  1998,  we
derived our gas operating revenues from the following types of customers:

                    o  residential- 58%
                    o  commercial- 30%
                    o  industrial- 5%
                    o  transportation and other- 7%.

     We are subject to the  jurisdiction  of the Public  Service  Commission  of
Wisconsin with respect to various  phases of our  operations,  including  rates,
service and the issuance of securities (including the debentures).  Our Illinois
subsidiary is subject to the  jurisdiction of the Illinois  Commerce  Commission
with respect to those matters.  We are also subject to the  jurisdiction  of the
Federal  Energy  Regulatory  Commission.  Our  parent  company,  Alliant  Energy
Corporation,  is a registered  public utility  holding  company under the Public
Utility  Holding  Company  Act  of  1935,  as  amended,  and is  subject  to the
requirements  of that Act. We are also subject to certain  requirements  of that
Act.

     Our principal  executive offices are located at 222 West Washington Avenue,
Madison, Wisconsin 53703, and our telephone number is (608) 252-3311.

                                USE OF PROCEEDS

     We intend to use the net proceeds from the sale of the  debentures to repay
short-term indebtedness and possibly to retire or refinance a portion of certain
of our existing series of First Mortgage Bonds, including potentially our Series
V, 9.30%, due 2025; Series W, 8.60%, due 2027; Series X, 7.75%, due 2004; and/or
Series Y, 7.60%,  due 2005.  As of February  18, 2000,  we had $88.5  million in
short-term debt outstanding at a weighted average interest rate of 5.97%. We may
initially  invest the proceeds that we do not immediately  require in short-term
marketable securities.


                                       3
<PAGE>

                         SELECTED FINANCIAL INFORMATION

     We have set forth below  selected  financial  information  about us for the
twelve months ended  September 30, 1999,  and the years ended December 31, 1998,
1997 and 1996.

<TABLE>
<CAPTION>
                                            Twelve Months
                                               Ended
                                            September 30,                           Year Ended
                                                1999                                December 31,
                                            -------------       ------------------------------------------------
                                             (Unaudited)            1998             1997            1996
                                                                    ----             ----            ----
                                                                             (Thousands of Dollars)
Income Statement Data:
<S>                                         <C>                 <C>             <C>              <C>
Operating Revenues.....................     $  736,900          $  731,448      $   794,717      $  759,275
Net Income Before Interest Expense.....     $   94,250          $   72,158      $   103,841      $  113,957
Earnings Available for Common Stock....     $   50,652          $   32,264      $    67,924      $   79,175
Ratio of Earnings to Fixed Charges
(unaudited) (1)........................           3.05                2.51             4.13            4.94

</TABLE>

<TABLE>
<CAPTION>
                                                                  At September 30, 1999 (Unaudited)
                                                                 ----------------------------------
                                                                                                  Percent of
                                                                            As                  Capitalization
                                                         Actual         Adjusted (2)             As Adjusted
                                                         ------         ------------             -----------
                                                          (Thousands of Dollars)
Capitalization:
<S>                                               <C>                 <C>                             <C>
First mortgage bonds (3).....................     $      251,000      $      251,000                   21.5%
Debentures (4)...............................            165,000             265,000                   22.7
Preferred stock without mandatory
  redemption.................................             59,963              59,963                    5.1
Common shareowners' investment...............            591,112             591,112                   50.7
                                                  --------------      --------------                  -----
    Total....................................     $    1,067,075      $    1,167,075                  100.0%
                                                  ==============      ==============                  =====
- ---------------
(1)  When we computed  the ratios of earnings to fixed  charges,  we  calculated
     earnings by adding  federal and state  income taxes and our estimate of the
     interest component of rentals to net income before interest expense.  Fixed
     charges represent interest expense,  amortization of debt discount, premium
     and expense and the estimated interest component of rentals.  Our ratios of
     earnings to fixed  charges were 4.33 and 4.38 for the years ended  December
     31, 1995 and 1994, respectively.

(2)  We have  adjusted  these numbers to show the effects of the issuance of the
     debentures.

(3)  We have excluded  variable rate demand bonds in the amount of $57.0 million
     and the unamortized  discount  relating to outstanding First Mortgage Bonds
     in the amount of $1.1 million in presenting these numbers.

(4)  We  have  excluded  the  unamortized   discount   relating  to  outstanding
     debentures in the amount of $0.3 million in presenting these numbers.
</TABLE>

                                        4
<PAGE>

                               RECENT DEVELOPMENTS


     For the fiscal year ended  December 31, 1999, we had operating  revenues of
$752.5  million,  net  income  before  interest  expense of $111.8  million  and
earnings  available for common stock of $67.5  million.  Our unaudited  ratio of
earnings to fixed charges for that period was 3.66.


                          DESCRIPTION OF THE DEBENTURES

General

     The debentures constitute our unsecured general obligations,  and they will
rank on a parity with all of our other  unsecured  and  unsubordinated  debt. We
will issue them as a separate series of securities under our Indenture, dated as
of June 20,  1997  (which we refer to in this  prospectus  as the  "Indenture"),
which we have  entered  into with  Firstar  Trust  Company (now known as Firstar
Bank,  N.A.),  as trustee.  The Indenture does not limit the amount of unsecured
debt  securities  that we can issue  under it,  and  provides  that we may issue
securities  from time to time in one or more series pursuant to the terms of one
or more officers' certificates or supplemental  indentures creating such series.
The Indenture also does not limit the total amount of debt that we can incur. As
of the date of this  prospectus,  we had $165 million of securities  outstanding
under the Indenture,  consisting of $105 million  aggregate  principal amount of
our 7% Debentures due June 15, 2007 and $60 million  aggregate  principal amount
of our 5.70%  Debentures  due October 15, 2008. The Indenture does not limit our
ability  to issue  additional  First  Mortgage  Bonds or to enter  into sale and
leaseback  transactions.  It  also  does  not  give  holders  of the  debentures
protection  in the event we engage in a highly  leveraged  or other  transaction
that may adversely affect holders of the debentures.

     Substantially all of our permanent fixed properties are subject to the lien
of the  Indenture of Mortgage or Deed of Trust,  dated August 1, 1941,  which we
entered into with First  Wisconsin  Trust  Company  (now known as Firstar  Bank,
N.A.),  and George B. Luhman  (Nancy V. Kelly being now the  individual  trustee
under  that  indenture),  as  trustees.  We  refer  to  that  indenture  and its
supplemental indentures in this prospectus as the "First Mortgage Indenture." We
have issued our First Mortgage Bonds under the First Mortgage  Indenture.  As of
the date of this  prospectus,  we had $308 million of secured  debt  outstanding
under  our  First  Mortgage  Indenture.  If we  become  bankrupt,  liquidate  or
reorganize,  the trustees for the First  Mortgage Bonds could use the collateral
property  subject to the First  Mortgage  Indenture  to satisfy our  obligations
under the First  Mortgage  Bonds  before  holders of unsecured  debt  securities
(including the debentures) would receive any payments.

     We have  summarized  below  various  provisions  of the  Indenture  and the
debentures.  Because this discussion is only a summary,  it does not necessarily
contain all of the information you should consider.  We have filed the Indenture
as an exhibit to the Registration  Statement and we incorporate the Indenture in
its entirety by reference into this prospectus.  We qualify the discussion below
in its entirety by reference to all of the  provisions  of the Indenture and all
officers' certificates or supplemental indentures relating thereto.

Maturity and Interest

     The debentures will be limited to $100 million  aggregate  principal amount
and will mature on _________,  ______.  Each  debenture  will bear interest from
_________,  2000 or from the most recent interest  payment date to which we have
paid  interest,  at the rate of % per year. We will pay interest twice per year,
on ______ and ______, commencing _______, 2000, to the person in whose name such
debenture is registered  at the close of business on the preceding  ________ and
_______, respectively.

No Redemption Prior to Maturity

     We cannot redeem the debentures before they mature.

Certain Covenants

     The  covenant  we  describe  below is the only  restrictive  covenant  that
applies to the debentures. If we issue additional series of securities under the
Indenture in the future,  those series may or may not have different  covenants.
Any  obligations  we have under the Indenture and the  debentures are subject to
termination if we exercise our defeasance rights,  which we describe below under
"Legal Defeasance and Covenant Defeasance."


                                       5
<PAGE>

     Limitations on Liens. The Indenture provides generally that, as long as any
securities  of any  series  to which  this  limitation  applies  (including  the
debentures) remain outstanding,  and subject to termination upon defeasance,  we
will not, and will not permit any of our  subsidiaries to, create or allow to be
created or to exist any mortgage,  pledge,  security interest,  or other lien on
any of our  properties or assets which we now own or acquire later to secure any
indebtedness,  without making  effective a provision  which makes the debentures
and the other securities of any series to which this limitation  applies equally
and ratably secured with (or prior to) all such  indebtedness and with any other
indebtedness that is also entitled to be equally secured.
This restriction does not apply to or prevent the creation or existence of:

     o the First Mortgage Indenture or any supplemental indenture thereto;

     o liens on property that existed when we acquired or built such property or
were created within one year after that time;

     o liens on property  that secure  payment of all or a part of the  purchase
price or construction cost of the property,  including the extension of any such
liens to repairs or improvements made on the property;

     o any  extensions,  renewals  or  replacements  of liens  permitted  by the
above-listed items;

     o the pledge of any bonds or other  securities at any time issued under any
of the liens permitted by the above-listed items; or

     o "Permitted  Encumbrances," which include,  among several other items, (a)
the pledge or assignment in the ordinary course of business of electricity,  gas
or steam accounts receivable or customers' installment paper; (b) liens affixing
to our  property  at the time  someone  consolidates  with or merges into us, or
transfers all or substantially all of its assets to us, but only if the property
we acquire is  adequate  security  for the  liens;  and (c) liens not  otherwise
permitted if, at the time we incur the lien and after giving effect to the lien,
the aggregate of all obligations  secured by the lien does not exceed 10% of our
Tangible Net Worth (as defined in the Indenture).

     Also,  this  restriction  will not  apply to or  prevent  the  creation  or
existence  of leases we enter into,  or existing on property we acquire,  in the
ordinary course of our business.

Successor Obligor

     The  Indenture  also  provides  that,  unless  otherwise  specified  in the
officers'  certificate  or  supplemental  indenture  establishing  a  series  of
securities,  we will not consolidate  with, sell all or substantially all of our
assets to, or merge with or into any other person unless:

     o  either  we  will  be  the  continuing  corporation,  or  the  continuing
corporation will be a person organized and existing under the laws of the United
States or a state,  and the person  will  expressly  assume  the  payment of the
principal  of and  interest  on all  the  securities  and  any  coupons  and the
performance  and  observance of all of our covenants  and  conditions  under the
Indenture by executing a supplemental indenture satisfactory to the trustee;

     o we or the  person,  as the case may be, will not,  immediately  after the
merger, consolidation or sale of assets, be in default in the performance of any
covenant or condition of the Indenture; and

     o after giving  effect to the  transaction,  no event which after notice or
lapse of time would become a default under the  Indenture  will have occurred or
be continuing.

     The Indenture  further  provides that the successor will be substituted for
us,  after which all of our  obligations  under the  Indenture,  the  securities
issued under the Indenture and any coupons will terminate.

Defaults and Remedies

     The  Indenture   discusses  certain  "Events  of  Default"  that  apply  to
securities  issued under the Indenture,  including the  debentures.  It provides
generally that an "Event of Default" with respect to the  debentures  will occur
if:

     o we default in any payment of interest on the debentures  when the payment
becomes due and payable and the default continues for 60 days;


                                       6
<PAGE>

     o we default in the payment of the  principal  of the  debentures  when the
payment becomes due and payable at maturity or otherwise;

     o we default in the performance of any of our other  agreements  applicable
to the debentures and the default  continues for 90 days after we receive notice
of the  default  from the  trustee or the  holders of at least 25% in  principal
amount of the debentures; or

     o  we  are  affected  by  certain  events  related  to  our  bankruptcy  or
insolvency.

     If an Event  of  Default  with  respect  to the  debentures  occurs  and is
continuing,  then either the trustee or the holders of at least 25% in principal
amount of the debentures can declare the principal of and all unpaid interest on
the debentures to be immediately due and payable.

     The trustee  can  require  that it be  indemnified  before it enforces  the
Indenture  or the  debentures.  Subject  to  certain  limitations,  holders of a
majority in  principal  amount of the  debentures  can direct the trustee in its
exercise of any trust or power.  The trustee does not have to give you notice of
any continuing default (except a default in payment of principal or interest) if
it in good faith determines that withholding notice is in your interest.  We are
required to give the trustee a brief certificate certifying as to our compliance
with all conditions and covenants under the Indenture at least once a year.

     The Indenture does not have a cross-default  provision.  That means that if
we default on any other  debt,  that  default  will not  constitute  an Event of
Default under the Indenture.

Amendments and Waivers

     Waivers.  The holders of a majority in principal  amount of the  debentures
can waive any existing default and its consequences  under the debentures or the
Indenture  by giving  notice to the  trustee.  However,  holders  cannot waive a
default in the  payment of the  principal  or interest  on the  debentures  or a
default in respect of a  provision  we describe in the  paragraph  that  follows
which  cannot be modified  or amended  without the consent of each holder of the
debentures.

     Amendments with Consent. With the consent of the holders of not less than a
majority in aggregate principal amount of the debentures, we and the trustee can
enter  into  supplemental  indentures  to amend or modify the  Indenture  or the
debentures,  if those amendments do not affect any other series of securities we
issued  under the  Indenture.  However,  we cannot  make such  modifications  or
amendments  without the consent of all of the holders of the debentures if those
amendments or modifications would:

     o extend the stated  maturity,  reduce the  principal  amount or reduce the
rate of interest on the debentures;

     o reduce our obligation to pay principal amounts;

     o change the coin or currency in which we must pay  principal  and interest
on the debentures;

     o impair the right to institute suit for the  enforcement of any payment of
principal or interest on the debentures after the due date of such payment;

     o reduce  the  amount  of  debentures  whose  holders  must  consent  to an
amendment or waiver of the provisions of the Indenture or the debentures; or

     o make certain  modifications  to any of the provisions we describe in this
paragraph and in the paragraph immediately above.

     We  cannot  enter  into  supplemental  indentures  to amend or  modify  the
Indenture  in ways that affect other  series of  securities  we issued under the
Indenture  without  the  consent of the  holders of not less than a majority  in
aggregate  principal  amount of all  securities  issued under the Indenture that
will  be  affected  by  such  an  amendment,   voting  together  as  one  class.
Furthermore,  if any  amendment  or  modification  would have any of the effects
described  in the previous  paragraph,  and would affect more than one series of
securities  issued under the  Indenture,  then we cannot make such  amendment or
modification  without the consent of all of the holders of the securities issued
under the Indenture that would be affected by them.

     Amendments  without  Consent.  We and  the  trustee  can  also  enter  into
supplemental  indentures  to amend or modify  the  Indenture  or the  debentures


                                       7
<PAGE>

without the consent of any holders of the debentures. We can only do so if those
amendments or modifications would have certain effects, including:

     o showing that another person has succeeded us and assumed our  obligations
under the covenants of the Indenture and the debentures;

     o adding  to our  covenants  under the  Indenture  for the  benefit  of the
holders of the debentures, or surrender any power we have under the Indenture;

     o adding to, changing or eliminating any of the provisions of the Indenture
in respect of the debentures,  but only if the change does not adversely  affect
the rights of the holders of the debentures in any material respect;

     o  establishing the form or terms of securities of any series;

     o evidencing the  appointment of a successor  trustee or a change in any of
the  provisions of the Indenture to facilitate  administration  by more than one
trustee; or

     o  making  clarifying  changes  to  ambiguous,  incorrect  or  inconsistent
language in the Indenture or the  debentures  that do not  adversely  affect the
rights of the holders of the debentures in any material respect.

Legal Defeasance and Covenant Defeasance

     The Indenture  provides that we can at any time terminate almost all of our
obligations  with  respect  to the  debentures  and the  Indenture.  We  cannot,
however,  terminate certain obligations,  including  obligations with respect to
the "defeasance  trust" (which we discuss below) and obligations to register the
transfer or exchange of the  debentures  and to maintain  agencies in respect of
the  debentures.  We refer to this  termination  of our  obligations  as  "legal
defeasance."  Also, at any time we can terminate our obligations with respect to
the    debentures    under   the   covenant   we   described    under   "Certain
Covenants--Limitations   on  Liens,"  above.  We  refer  to  this  as  "covenant
defeasance."

     We can  exercise  our  legal  defeasance  option  even if we  have  already
exercised our covenant  defeasance  option.  If we exercise our legal defeasance
option,  then  the  debentures  cannot  be  accelerated  because  of an Event of
Default.  If we exercise our covenant  defeasance  option,  then the  debentures
cannot be  accelerated  by reference to the covenant  described  under  "Certain
Covenants--Limitations on Liens," above.

     If we desire to exercise either defeasance option,  then we must deposit in
trust (which we refer to as the  "defeasance  trust") with the trustee  money or
U.S. government  obligations  sufficient to pay the outstanding principal amount
of the debentures as well as the interest on the debentures to maturity. We must
also comply with certain  other  conditions.  In  particular,  we must obtain an
opinion of tax counsel that the defeasance will not result in recognition of any
gain or loss to holders of the debentures for federal income tax purposes.  When
we refer to "U.S. government obligations," we refer to direct obligations of the
United  States of  America  which  have the full  faith and credit of the United
States of America pledged for payment and which are not callable at the issuer's
option, or certificates representing an ownership interest in those obligations.

Regarding the Trustee

     Firstar  Bank,  N.A.  will act as trustee,  registrar,  transfer  agent and
paying agent for the debentures. We can remove the trustee with or without cause
if we notify the trustee  six months in advance  and if no default  occurs or is
continuing during the six-month period.  The trustee is also one of the trustees
under the First Mortgage Indenture for our First Mortgage Bonds.

     We maintain  general  checking  accounts with the trustee and several other
banks which are affiliates of the trustee.  Our parent  company,  Alliant Energy
Corporation,  has a $250 million  syndicated credit facility provided by various
banks,  of which $15 million is committed by the trustee.  In addition,  Alliant
Energy  Corporation  maintains an  uncommitted  master note  agreement  with the
trustee which allows it to borrow up to $50 million from time to time.

     To the extent  provided in the  Indenture,  the  trustee  will have a prior
claim on certain  amounts held by it under the  Indenture for the payment of its
compensation and expenses and for the repayment of advances made by it to effect
performance of certain covenants in the Indenture.


                                       8
<PAGE>

                             BOOK-ENTRY ONLY SYSTEM

     We will not issue the debentures in definitive form. Instead, we will issue
the  debentures  in the  form of one or more  global  securities.  These  global
securities will be held by DTC as depositary.  The debentures will be registered
in the name of CEDE & Co. as nominee for DTC.

     DTC has  indicated  it  intends  to follow the  following  procedures  with
respect to book-entry interests in the debentures.

     Ownership  of  book-entry  interests  will be limited  to persons  who have
accounts with DTC for the debentures (we call those persons  "participants")  or
persons  who hold  interests  through  those  participants.  When we  issue  the
debentures,  DTC  will  credit  the  participants'  accounts  on its  book-entry
registration  and transfer  system with the principal  amounts of the debentures
that each  participant  beneficially  owns. The accounts DTC will credit will be
designated by dealers,  underwriters or agents participating in the distribution
of the debentures (see  "Underwriting").  If you own book-entry interests in the
debentures,  then  your  ownership  will  be  shown,  and any  transfer  of your
ownership  interest  will be effected,  only through  DTC's  records (if you own
interests  in the  debentures  as a  participant)  or  through  the  records  of
participants (if you hold interests in the debentures through participants). The
laws of some states may require  that  certain  purchasers  of  securities  take
physical  delivery of such securities in definitive  form. These laws may impair
the ability to own, transfer or pledge  beneficial  interests in book-entry note
securities.

     As long as CEDE & Co. is the nominee of DTC, we are referring to CEDE & Co.
in this prospectus  when we refer to holders of the  debentures,  and CEDE & Co.
will be considered  the sole owner or holder of the  debentures for all purposes
under the  Indenture.  If you  purchase  any  interest in the  debentures,  your
ownership  will be recorded as a "book-entry  interest" in the  book-entry  only
system that DTC  operates.  You will not receive any  certificates  representing
your book-entry interests. As a result, if you are a participant,  then you must
rely on DTC's  procedures with respect to the debentures and the book-entry only
system to exercise any rights of a holder under the Indenture.  If you are not a
participant,  you must rely on the procedures of the  participant  through which
you own your interest to exercise any rights of a holder under the Indenture. We
understand  that,  under  existing  industry  practice,  DTC will  authorize the
persons on whose behalf it holds book-entry interests to exercise certain rights
of holders of debentures.

     We will make  payments of principal of and  interest on the  debentures  to
CEDE & Co. as the registered holder of the related global note security. We will
not,  nor will the trustee or any other  agent of ours or agent of the  trustee,
have any  responsibility  or liability for any aspect of the records relating to
or payments made on account of beneficial  ownership interests in the debentures
or for maintaining,  supervising or reviewing any records relating to beneficial
ownership interests.

     We expect  that DTC will credit  participants'  accounts  with  payments of
principal  and  interest  on the  debentures  in  amounts  proportionate  to the
respective amounts of book-entry  interests held by each participant as shown on
its  records as soon as it  receives  the  payment  from us. We also expect that
payments by participants  to owners of book-entry  interests will be governed by
standing customer instructions and customary practices,  as is now the case with
the  securities  held for the accounts of customers in bearer form or registered
in "street name," and will be the responsibility of those participants.

     We will issue individual certificates to the owners of book-entry interests
in the  debentures in exchange for the  debentures  held by DTC or CEDE & Co. if
DTC is at any time unwilling or unable to continue as depositary or ceases to be
a registered clearing agency and a successor depositary registered as a clearing
agency  is not  appointed.  In  addition,  we may at any  time  and in our  sole
discretion  determine  not to have  the  debentures  represented  by one or more
global note securities.  In that event, we will issue individual certificates in
exchange  for  the  global  note  securities  of  the  debentures.  Global  note
securities will also be exchangeable by the holders for certificates if an event
of default with respect to the debentures  has occurred and is  continuing.  Any
certificates issued in exchange for a global note security will be registered in
such name or names as DTC  shall  instruct  the  trustee.  We  expect  that such
instructions


                                       9
<PAGE>

will be based on  directions  DTC  receives  from  participants  with respect to
ownership of book-entry interests relating to such global note security.


     We  have  obtained  the  foregoing  information   concerning  DTC  and  its
book-entry  system  from  sources  we  believe  to be  reliable,  but we take no
responsibility for the accuracy of this information.

                                  UNDERWRITING

     We have entered into an underwriting  agreement with Robert W. Baird & Co.,
acting on behalf of itself and Banc One Capital  Markets,  Inc., Legg Mason Wood
Walker,  Incorporated and Wachovia Securities,  Inc. (whom we collectively refer
to as the  "underwriters"),  pursuant  to  which  we have  agreed  to  sell  the
debentures to the  underwriters in the principal  amounts we have set forth next
to their names below:

                                                         Principal
               Underwriters                               Amount
               ------------                              ---------
     Robert W. Baird & Co.
     Banc One Capital Markets, Inc.
     Legg Mason Wood Walker, Incorporated
     Wachovia Securities, Inc.
              Total.............................      $100,000,000
                                                      ============

     The underwriting agreement provides that the underwriters'  obligations are
subject to the certain  conditions  precedent and that the underwriters  will be
severally obligated to purchase all of the debentures if they purchase any.

     The  underwriters  have  advised  us that  they  will  initially  offer the
debentures to the public at the public  offering  price we have set forth on the
cover page of this  prospectus.  They will also offer the debentures to selected
dealers at the price minus a concession,  which will be no greater than % of the
principal amount of the debentures. The underwriters can allow, and the selected
dealers  can  reallow,  a discount on sales to other  dealers,  which will be no
greater  than % of the  principal  amount of the  debentures.  After the initial
public  offering,  the  underwriters  may  change  the  public  offering  price,
concession and discount.

     The  debentures are a new issue of securities  with no established  trading
market. We do not intend to list the debentures on any securities exchange.  The
underwriters  have advised us that they currently intend to make a market in the
debentures.  However,  they are not obligated to do so, and any  underwriter can
stop making  such a market at any time  without  notice.  We cannot give you any
assurance that a liquid trading market for the debentures will develop.

     Until the distribution of the debentures is completed,  SEC rules may limit
the  underwriters'  ability  to bid  for  and  purchase  the  debentures.  As an
exception to these rules,  Robert W. Baird & Co., as representative,  is allowed
to engage in certain  transactions  that stabilize the price of the  debentures.
Those  transactions  may include bids or  purchases  for the purpose of setting,
fixing or maintaining the price of the debentures.

     If  the  underwriters  create  a  "short  position"  in the  debentures  in
connection  with the offering (that is, if they sell more of the debentures than
are set forth on the cover page of this prospectus),  then Robert W. Baird & Co.
can reduce that short  position by  purchasing  debentures  in the open  market.
Purchases  of the  debentures  for the purpose of  stabilization  or to reduce a
short  position  could  cause the price of the  debentures  to be higher than it
might be in the absence of such purchases.

     We do not, nor do the underwriters,  make any  representation or prediction
as to the direction or magnitude of any effect that the transactions we describe
above  may  have on the  prices  of the  debentures.  We also  do not  make  any
representation  that Robert W. Baird & Co. will engage in such  transactions  or
that if they do, they will not discontinue such transactions without notice.

     Certain  affiliates  of  Banc  One  Capital  Markets,   Inc.  and  Wachovia
Securities,  Inc. engage in certain arms-length  commercial banking transactions
with Alliant Energy Corporation.

     We have agreed to indemnify the underwriters  against certain  liabilities,
including  liabilities  under the  Securities  Act of 1933,  as  amended,  or to
contribute  to  payments  the  underwriters  may be  required to make in respect
thereof.


                                       10
<PAGE>

                                 LEGAL OPINIONS

     Foley & Lardner of Milwaukee,  Wisconsin  will issue an opinion to us about
certain legal matters with respect to the debentures.  The underwriters  will be
advised  about other  issues  relating to the  offering by Chapman and Cutler of
Chicago, Illinois.

                                     EXPERTS

     Arthur  Andersen LLP,  independent  public  accountants,  have audited,  as
indicated in their reports,  our consolidated  financial statements and schedule
at  December  31,  1998 and 1997 and for each of the three  years in the  period
ending  December  31,  1998 that we have  incorporated  by  reference  into this
prospectus and in the Registration  Statement.  We have included those financial
statements in this  prospectus  in reliance on the authority of Arthur  Andersen
LLP as experts in accounting and auditing in giving their reports.

                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual,  quarterly  and current  reports and proxy  statements  and
other information with the SEC. You may read and copy any document which we file
at the SEC's public reference rooms at 450 Fifth Street, N.W., Washington, D.C.,
and at regional SEC offices in Chicago,  Illinois,  and New York,  New York. You
can call the SEC at 1-800-SEC-0330  for more information on the operation of the
public  reference  rooms. You can also inspect our filings at the offices of the
American Stock  Exchange,  86 Trinity Place,  New York, New York 10006.  We have
certain  securities  listed  on that  exchange.  Finally,  you can also find our
public filings with the SEC on the internet at a web site  maintained by the SEC
located at http://www.sec.gov.

     We have  filed a  Registration  Statement  on Form  S-3  with  the SEC with
respect  to the  debentures  we  are  offering  through  this  prospectus.  This
prospectus,  which  constitutes a part of the Registration  Statement,  does not
contain all of the information shown in the Registration Statement.  For further
information  about us and the  debentures,  you  should  read  the  Registration
Statement and the exhibits thereto which you can inspect at the public reference
rooms of the SEC described above, or through the SEC's web site.

                       DOCUMENTS INCORPORATED BY REFERENCE

     The SEC  allows us to  "incorporate  by  reference"  information  into this
prospectus.  This means that we can  disclose  important  information  to you by
referring  you to  another  document  we filed  separately  with  the  SEC.  The
information we incorporate by reference into this prospectus is considered to be
a part of this prospectus,  and information that we file later with the SEC will
automatically update and supersede this information. We incorporate by reference
the  documents  we list below and any future  filings we make with the SEC under
Sections 13(a),  13(c),  14 or 15(d) of the Securities  Exchange Act of 1934, as
amended,  until we sell  all of the  debentures  we are  offering  through  this
prospectus:

     o Our Annual Report on Form 10-K for the year ended December 31, 1998;

     o Our Quarterly Reports on Form 10-Q for the quarters ended March 31, 1999,
June 30, 1999 and September 30, 1999; and

     o Our Current Report on Form 8-K dated February 25, 2000.

     You can  request a copy of any of these  filings  by  writing  to Edward M.
Gleason, Vice  President-Treasurer and Corporate Secretary,  Wisconsin Power and
Light Company,  222 West  Washington  Avenue,  Madison,  Wisconsin  53703, or by
calling Mr. Gleason at (608) 252-3311.  We will send to you any such filings you
request, without charge,  excluding the exhibits to those documents,  unless the
exhibits are specifically incorporated by reference into those documents.


                                       11
<PAGE>

- --------------------------------------------------------------------------------
      , 2000


                                  $100,000,000

                        Wisconsin Power and Light Company


                          % Debentures due         ,




                            ------------------------
                                   Prospectus
                            ------------------------



                              Robert W. Baird & Co.

                         Banc One Capital Markets, Inc.

                             Legg Mason Wood Walker
                                  Incorporated

                            Wachovia Securities, Inc.



- --------------------------------------------------------------------------------
         You should only rely on the  information  contained or  incorporated by
reference in this prospectus.  We have not authorized anyone to provide you with
information different from that contained in this prospectus. We are offering to
sell, and seeking offers to buy, these  securities only in  jurisdictions  where
offers and sales are permitted.  The information contained in this prospectus is
accurate  only as of the  date of this  prospectus,  regardless  of the  time of
delivery of this prospectus or of any sale of these securities.
- --------------------------------------------------------------------------------

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution.

     The  expenses in  connection  with the  issuance  and  distribution  of the
securities  covered  hereby,  other than  underwriting  and other  discounts and
commissions, are, subject to future contingencies, estimated to be as follows:

     Securities and Exchange Commission Registration Fee......    $27,800
     Fee of Public Service Commission of Wisconsin............      1,000
     Printing and Engraving Expenses..........................     25,000
     Fees of Rating Agencies..................................     30,000
     Trustee Fees and Expenses................................     10,000
     Accounting Fees and Expenses.............................     20,000
     Legal Fees and Expenses..................................     50,000
     Blue Sky Fees and Expenses...............................      5,000
     Miscellaneous Expenses...................................      6,200
                                                                    -----
          Total...............................................   $175,000
                                                                 ========

Item 15. Indemnification of Directors and Officers.

     Pursuant to the provisions of the Wisconsin  Business  Corporation  Law and
Article  VIII  of  the  Registrant's  Bylaws,  directors  and  officers  of  the
Registrant are entitled to mandatory indemnification from the Registrant against
certain  liabilities (which may include  liabilities under the Securities Act of
1933) 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 defense  thereof,  unless it is determined that the
director  or  officer  breached  or failed to  perform  his or her duties to the
Registrant and such breach or failure constituted: (a) a willful failure to deal
fairly with the Registrant or its  shareholders  in connection  with a matter in
which the  director  or  officer  had a material  conflict  of  interest;  (b) a
violation of criminal law unless the director or officer had a 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.
Additionally,  under the Wisconsin  Business  Corporation Law,  directors of the
Registrant  are  not  subject  to  personal  liability  to the  Registrant,  its
shareholders  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 outlined in (a) through (d)
above.

     The indemnification  provided by the Wisconsin Business Corporation Law and
the Registrant's Bylaws is not exclusive of any other rights to which a director
or officer of the  Registrant  may be  entitled.  The  Registrant  also  carries
directors' and officers' liability insurance.

     The proposed form of  Underwriting  Agreement for the  debentures  contains
provisions  under which the  underwriters  agree to indemnify  the directors and
officers of the Registrant against certain  liabilities,  including  liabilities
under the  Securities Act of 1933 or to contribute to payments the directors and
officers may be required to make in respect thereof.

Item 16. Exhibits.

     The exhibits  listed in the  accompanying  Exhibit  Index are filed (except
where otherwise indicated) as part of this Registration Statement.


                                      II-1
<PAGE>

Item 17.  Undertakings.

          (a) 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 the
Registration  Statement  shall  be  deemed  to be a new  Registration  Statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

          (b) The undersigned Registrant hereby undertakes that:

                    (1) For  purposes of  determining  any  liability  under the
          Securities  Act of  1933,  the  information  omitted  from the form of
          prospectus  filed as part of this  Registration  Statement in reliance
          upon  Rule 430A and  contained  in a form of  prospectus  filed by the
          Registrant  pursuant  to Rule  424(b)(1)  or (4) or  497(h)  under the
          Securities  Act  shall  be  deemed  to be part  of  this  Registration
          Statement as of the time it was declared effective.

                    (2) For the purpose of determining  any liability  under the
          Securities Act of 1933, each post-effective  amendment that contains a
          form of prospectus shall be deemed to be a new Registration  Statement
          relating to the securities  offered therein,  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  Securities  and
Exchange  Commission such  indemnification is against public policy as expressed
in the Securities  Act of 1933 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.



                                      II-2

<PAGE>

                                   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-3 and has duly caused this  Amendment  to the
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly  authorized,  in the City of Madison,  State of Wisconsin,  on February 25,
2000.

                                         WISCONSIN POWER AND LIGHT COMPANY


                                         By: /s/ Erroll B. Davis, Jr.
                                             ----------------------------------
                                             Erroll B. Davis, Jr.
                                             Chief Executive Officer


     Pursuant to the  requirements of the Securities Act of 1933, this Amendment
to the Registration  Statement has been signed below by the following persons in
the capacities and on the dates indicated.


Signature                          Title                            Date
- ---------                          -----                            ----


/s/ Erroll B. Davis, Jr.      Chief Executive Officer          February 25, 2000
- ----------------------------  and Director (Principal
Erroll B. Davis, Jr.          Executive Officer)


/s/ Thomas M. Walker          Executive Vice President         February 25, 2000
- ----------------------------  and Chief Financial Officer
Thomas M. Walker              (Principal Financial Officer)


/s/ Daniel A. Doyle           Vice President, Chief            February 25, 2000
- ----------------------------  Accounting and Financial
Daniel A. Doyle               Planning Officer (Principal
                              Accounting Officer)


Alan B. Arends*               Director                         February 25, 2000


Jack B. Evans*                Director                         February 25, 2000


Rockne G. Flowers*            Director                         February 25, 2000


Joyce L. Hanes*               Director                         February 25, 2000


Lee Liu*                      Director                         February 25, 2000


Katharine C. Lyall*           Director                         February 25, 2000


Arnold M. Nemirow*            Director                         February 25, 2000



                                      II-3
<PAGE>

Signature                          Title                            Date
- ---------                          -----                            ----



Milton E. Neshek*             Director                         February 25, 2000


Judith D. Pyle*               Director                         February 25, 2000


Robert D. Ray*                Director                         February 25, 2000


Robert W. Schlutz*            Director                         February 25, 2000


Wayne H. Stoppelmoor*         Director                         February 25, 2000


Anthony R. Weiler*            Director                         February 25, 2000



*By: /s/ Erroll B. Davis, Jr.
     ----------------------------
     Erroll B. Davis, Jr.
     Attorney-in-fact


     Pursuant  to  Transaction  Requirement  B.2 of  Form  S-3,  the  Registrant
reasonably  believes that the security  rating to be assigned to the  securities
registered  hereunder will make the  securities  "investment  grade  securities"
prior to sale.


                                      II-4
<PAGE>

                                  EXHIBIT INDEX

Exhibit
Number                       Document Description
- ------                       --------------------

(1)*      Proposed form of Underwriting Agreement relating to the debentures.

(4.1)     Indenture of Mortgage or Deed of Trust dated  August 1, 1941,  between
          the Company and First  Wisconsin  Trust Company  (n/k/a  Firstar Bank,
          N.A.) and George B. Luhman, as Trustees  (incorporated by reference to
          Exhibit 7(a) in File No. 2-6409).

(4.2)     Supplemental   Indenture  dated  January  1,  1948   (incorporated  by
          reference to Second Amended Exhibit 7(b) in File No. 2-7361).

(4.3)     Supplemental  Indenture  dated  September  1, 1948,  (incorporated  by
          reference to Amended Exhibit 7(c) in File No. 2-7628).

(4.4)     Supplemental  Indenture dated June 1, 1950  (incorporated by reference
          to Amended Exhibit 7.02 in File No. 2-8462).

(4.5)     Supplemental  Indenture dated April 1, 1951 (incorporated by reference
          to Amended Exhibit 7.02 in File No 2-8882).

(4.6)     Supplemental  Indenture dated April 1, 1952 (incorporated by reference
          to Second Amended Exhibit 4.03 in File No. 2-9526).

(4.7)     Supplemental  Indenture  dated  September  1,  1953  (incorporated  by
          reference to Amended Exhibit 4.03 in File No. 2-10406).

(4.8)     Supplemental   Indenture  dated  October  1,  1954   (incorporated  by
          reference to Amended Exhibit 2.02 in File No. 2-11130).

(4.9)     Supplemental  Indenture dated March 1, 1959 (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-14816).

(4.10)    Supplemental Indenture dated May 1, 1962 (incorporated by reference to
          Amended Exhibit 2.02 in File No. 2-20372).

(4.11)    Supplemental Indenture dated August 1, 1968 (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-29738).

(4.12)    Supplemental  Indenture dated June 1, 1969  (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-32947).

(4.13)    Supplemental   Indenture  dated  October  1,  1970   (incorporated  by
          reference to Amended Exhibit 2.02 in File No. 2-38304).

(4.14)    Supplemental  Indenture dated July 1, 1971  (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-40802).

(4.15)    Supplemental  Indenture dated April 1, 1974 (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-50308).

(4.16)    Supplemental   Indenture  dated  December  1,  1975  (incorporated  by
          reference to Exhibit 2.01(a) in File No. 2-57775).

(4.17)    Supplemental Indenture dated May 1, 1976 (incorporated by reference to
          Amended Exhibit 2.02 in File No. 2-56036).

(4.18)    Supplemental  Indenture dated May 15, 1978  (incorporated by reference
          to Amended Exhibit 2.02 in File No. 2-61439).

(4.19)    Supplemental Indenture dated August 1, 1980 (incorporated by reference
          to Exhibit 4.02 File No. 2-70534).

(4.20)    Supplemental   Indenture  dated  January  15,  1981  (incorporated  by
          reference to Amended Exhibit 4.03 in File No. 2-70534).


                                      E-1
<PAGE>
Exhibit
Number                       Document Description
- ------                       --------------------

(4.21)    Supplemental Indenture dated August 1, 1984 (incorporated by reference
          to Exhibit 4.02 in File No. 33-2579).

(4.22)    Supplemental   Indenture  dated  January  15,  1986  (incorporated  by
          reference to Amended Exhibit 4.03 in File No. 33-2579).

(4.23)    Supplemental  Indenture dated June 1, 1986  (incorporated by reference
          to Amended Exhibit 4.02 in File No. 33-4961).

(4.24)    Supplemental Indenture dated August 1, 1988 (incorporated by reference
          to Exhibit 4.24 in File No. 33-45726).

(4.25)    Supplemental   Indenture  dated  December  1,  1990  (incorporated  by
          reference to Exhibit 4.25 in File No. 33-45726).

(4.26)    Supplemental  Indenture  dated  September  1,  1991  (incorporated  by
          reference to Exhibit 4.26 in File No. 33-45726).

(4.27)    Supplemental   Indenture  dated  October  1,  1991   (incorporated  by
          reference to Exhibit 4.27 in File No. 33-45726).

(4.28)    Supplemental  Indenture dated March 1, 1992 (incorporated by reference
          to Exhibit 4.1 to the Company's Form 8-K dated March 9, 1992).

(4.29)    Supplemental Indenture dated May 1, 1992 (incorporated by reference to
          Exhibit 4.1 to the Company's Form 8-K dated May 12, 1992).

(4.30)    Supplemental  Indenture dated June 1, 1992  (incorporated by reference
          to Exhibit 4.1 to the Company's Form 8-K dated June 29, 1992).

(4.31)    Supplemental  Indenture dated July 1, 1992  (incorporated by reference
          to Exhibit 4.1 to the Company's Form 8-K dated July 20, 1992).

(4.32)    Indenture,  dated as of June 20, 1997, between the Company and Firstar
          Trust  Company  (n/k/a  Firstar  Bank,  N.A.),  as  Trustee,  for  the
          Debentures (incorporated by reference to Exhibit 4.33 to Amendment No.
          2 to the Company's Form S-3 Registration  Statement  [Registration No.
          33-60917]).

(4.33)    Officers'  Certificate,  dated  as of  June  25,  1997,  creating  the
          Company's 7% Debentures due June 15, 2007  (incorporated  by reference
          to Exhibit 4 to the Company's Form 8-K dated June 25, 1997).

(4.34)    Officers'  Certificate,  dated as of October 27,  1998,  creating  the
          Company's  5.70%  Debentures  due October 15,  2008  (incorporated  by
          reference  to Exhibit 4 to the  Company's  Form 8-K dated  October 27,
          1998).

(5)**     Opinion of Foley & Lardner (including consent of counsel).

(12)      Statement re computation of ratios of earnings to fixed charges.

(23.1)    Consent of Arthur Andersen LLP

(23.2)**  Consent of Foley & Lardner (filed as part of Exhibit (5)).

(24)***   Powers of attorney.

(25)**    Form T-1 Statement of Eligibility  and  Qualification  under the Trust
          Indenture  Act  of  1939  of  Firstar  Bank,  N.A.   relating  to  the
          debentures.

- -------------
*         To be  filed  by  amendment  to the  Registration  Statement  or as an
          exhibit to a Current Report on Form 8-K.

**        Previously filed with the Registration Statement.
***       All powers of  attorney  were filed  with the  Registration  Statement
          except the power of attorney for Jack B. Evans, filed herewith.


                                      E-2


<TABLE>
                                                                                                             EXHIBIT 12

                                         WISCONSIN POWER AND LIGHT COMPANY
                                        RATIO OF EARNINGS TO FIXED CHARGES
<CAPTION>
                                                                                                                    Twelve Months
                                                                                                                        Ended
                                                                    Years Ended December 31,                        September 30,
                                                -----------------------------------------------------------------
                                                  1994       1995       1996       1997       1998       1999            1999
                                                ---------- ---------- ---------- ---------- ---------- ----------  ----------------
                                                                               (Dollars in thousands)
<S>                                              <C>        <C>        <C>        <C>        <C>        <C>              <C>
Net income                                       $ 71,495   $ 78,652   $ 82,485   $ 71,234   $ 35,574   $ 70,803         $  53,962
Income taxes                                       44,727     45,606     53,808     41,839     24,670     45,758            34,380
                                                ---------- ---------- ---------- ---------- ---------- ----------  ----------------
Net income before income taxes                    116,222    124,258    136,293    113,073     60,244    116,588            88,342
                                                ---------- ---------- ---------- ---------- ---------- ----------  ----------------

Interest expense                                   31,148     33,821     31,472     32,607     36,584     40,992            40,288
Estimated interest component of rent expense        3,247      3,474      3,160      3,524      3,202      2,858             2,725
                                                ---------- ---------- ---------- ---------- ---------- ----------  ----------------
Fixed charges as defined                           34,395     37,295     34,632     36,131     39,786     43,850            43,013
                                                                                                                   ----------------

Earnings as defined                              $150,617   $161,553   $170,925   $149,204   $100,030   $160,438         $ 131,355
                                                ========== ========== ========== ========== ========== ==========  ================

Ratio of Earnings to Fixed Charges (Unaudited)       4.38       4.33       4.94       4.13       2.51       3.66              3.05
                                                ========== ========== ========== ========== ========== ==========  ================
</TABLE>



                                                                  Exhibit (23.1)


                    Consent of Independent Public Accountants
                    -----------------------------------------

As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  amendment to the  registration  statement of our report dated
January 29, 1999 included in the Wisconsin Power and Light Company Form 10-K for
the year ended  December 31, 1998 and to all  references to our firm included in
this registration statement.



                                         ARTHUR ANDERSEN LLP



Milwaukee, Wisconsin
February 25, 2000





                                POWER OF ATTORNEY

                   KNOW ALL PERSONS BY THESE PRESENTS, That I

                                  Jack B. Evans

hereby  constitute  and appoint  Erroll B. Davis,  Jr.,  William D. Harvey,  and
Edward  M.  Gleason,  and  each  of  them  individually,   my  true  and  lawful
attorney-in-fact  and agent, with full power of substitution and resubstitution,
for me and in my name,  place and stead, in any and all  capacities,  to sign my
name as a director of Wisconsin  Power and Light Company (the  "Company") to the
Registration Statement on Form S-3, and any amendments (including post-effective
amendments) or supplements  thereto,  relating to a public offering of unsecured
debt  securities  to be  issued  and  sold  by the  Company,  and to  file  said
Registration   Statement,   and  any  amendment  (including  any  post-effective
amendment) or supplement thereto, with the Securities and Exchange Commission in
connection  with the  registration  of the unsecured debt  securities  under the
Securities Act of 1933, as amended.

         I hereby ratify and confirm all that said attorneys-in-fact and agents,
or each of them,  have done or shall  lawfully  do by  virtue  of this  Power of
Attorney.


                  WITNESS my hand this 25th day of February, 2000.


                                         /s/ Jack B. Evans
                                             ---------------------------------
                                             Jack B. Evans




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