WESTERN RESOURCES INC /KS
424B5, 1996-07-25
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. AN EFFECTIVE
REGISTRATION  STATEMENT RELATING  TO THESE  SECURITIES HAS  BEEN FILED  WITH THE
SECURITIES AND EXCHANGE COMMISSION. NEITHER  THIS PROSPECTUS SUPPLEMENT NOR  THE
PROSPECTUS  TO  WHICH  IT RELATES  SHALL  CONSTITUTE  AN OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                   SUBJECT TO COMPLETION, DATED JUNE 3, 1996
 
                                                FILED PURSUANT TO RULE 424(B)(2)
                                                 REGISTRATION NO. 33-63505
                                                 REGISTRATION NO. 333-5123
 
         [LOGO]
 
                         4,800,000 PREFERRED SECURITIES
                          WESTERN RESOURCES CAPITAL II
     % CUMULATIVE QUARTERLY INCOME PREFERRED SECURITIES, SERIES B (QUIPS-SM-)*
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
 
               GUARANTEED TO THE EXTENT THAT THE SERIES B ISSUER
                        HAS FUNDS AS SET FORTH HEREIN BY
 
                            WESTERN RESOURCES, INC.
                                   ---------
 
    The      % Cumulative Quarterly Income  Preferred Securities, Series B  (the
"Series  B Preferred  Securities") offered hereby  represent undivided preferred
beneficial interests in Western Resources Capital  II, a trust formed under  the
laws  of the State of Delaware (the "Series  B Issuer" or the "Series B Trust").
The preferred interests represented  by the Series  B Preferred Securities  will
have a preference under certain circumstances with respect to cash distributions
and  amounts  payable on  liquidation, redemption  or  otherwise over  the trust
interests represented by the Series B  Common Securities (as defined) issued  by
the   Series  B  Issuer.  See  "Description   of  the  Preferred  Securities  --
Subordination of Common Securities" in the accompanying Prospectus.
                                                        (CONTINUED ON NEXT PAGE)
                                 --------------
 
    SEE "RISK  FACTORS" BEGINNING  ON PAGE  S-5 HEREOF  FOR CERTAIN  INFORMATION
RELEVANT  TO AN INVESTMENT  IN THE SERIES B  PREFERRED SECURITIES, INCLUDING THE
PERIOD AND  CIRCUMSTANCES  DURING  AND  UNDER WHICH  PAYMENT  ON  THE  SERIES  B
PREFERRED SECURITIES AND THE SERIES B DEBENTURES MAY BE DEFERRED AND THE RELATED
FEDERAL INCOME TAX CONSEQUENCES.
                                 -------------
THESE  SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE  SECURITIES COMMISSION NOR HAS THE  SECURITIES
 AND  EXCHANGE COMMISSION OR ANY STATE  SECURITIES COMMISSION PASSED UPON THE
   ACCURACY OR ADEQUACY OF THIS  PROSPECTUS SUPPLEMENT OR THE PROSPECTUS  TO
    WHICH IT RELATES.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                                 --------------
 
<TABLE>
<CAPTION>
                                                                                                  PROCEEDS TO THE
                                                               INITIAL PUBLIC    UNDERWRITING         SERIES B
                                                               OFFERING PRICE   COMMISSION(1)       ISSUER(2)(3)
                                                              ----------------  --------------  --------------------
<S>                                                           <C>               <C>             <C>
Per Series B Preferred Security.............................       $25.00            (2)               $25.00
Total.......................................................    $120,000,000         (2)            $120,000,000
</TABLE>
 
- ------
(1) The  Series  B Issuer  and Western  Resources have  agreed to  indemnify the
    several  Underwriters  (as  defined  herein)  against  certain  liabilities,
    including liabilities under the Securities Act of 1933.
(2) In  view of the fact that the proceeds of the sale of the Series B Preferred
    Securities  will  be  used  to   purchase  the  Series  B  Debentures,   the
    Underwriting  Agreement  provides that  Western  Resources will  pay  to the
    Underwriters, as compensation for their arranging the investment therein  of
    such  proceeds, $       per Series B Preferred  Security; or, in the case of
    certain institutions, $    per Series B Preferred Security. Accordingly, the
    maximum aggregate amount of underwriting commission will be $          , but
    the actual amount of underwriting commission  will be less than such  amount
    to  the  extent  that  Series  B  Preferred  Securities  are  sold  to  such
    institutions.
(3) Expenses of  the  offering, which  are  payable by  Western  Resources,  are
    estimated to be $207,000.
                                 --------------
    The  Series B Preferred  Securities offered hereby  are offered severally by
the Underwriters, as specified herein, subject to receipt and acceptance by them
and subject to  their right  to reject  any order  in whole  or in  part. It  is
expected that delivery of the Series B Preferred Securities will be made only in
book-entry  form through the facilities of DTC in New York, New York on or about
            , 1996, against payment therefor in immediately available funds.
- ------
* QUIPS-SM- is a servicemark of Goldman, Sachs & Co.
 
GOLDMAN, SACHS & CO.                                           SMITH BARNEY INC.
           BEAR, STEARNS & CO. INC.
                      DILLON, READ & CO. INC.
                                        PRUDENTIAL SECURITIES INCORPORATED
                                                         EVEREN SECURITIES, INC.
 
                                  -----------
<PAGE>
          The date of this Prospectus Supplement is           , 1996.
<PAGE>
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    Western Resources, Inc.,  a Kansas corporation  ("Western Resources" or  the
"Company"),  is  the owner  of  the trust  interests  represented by  the common
securities (the "Series B Common Securities") issued by the Series B Issuer. The
Series B Issuer exists for the sole  purpose of issuing its trust interests  and
investing  the proceeds thereof  in the       % Deferrable Interest Subordinated
Debentures, Series B  Due 2036  (the "Series  B Debentures")  issued by  Western
Resources.
 
    Holders  of the  Series B Preferred  Securities will be  entitled to receive
cumulative cash distributions accruing  from the date  of original issuance  and
payable  quarterly in arrears on March 31, June 30, September 30 and December 31
of each year, commencing               , 1996, at  the rate of     % per  annum.
Western  Resources has  the right  to defer  interest payments  on the  Series B
Debentures by extending the interest payment  period thereon at any time for  up
to  20 consecutive quarters  (each an "Extension  Period"). If interest payments
are so deferred, distributions on the Series B Preferred Securities will also be
deferred. During an Extension Period, distributions, as well as interest thereon
to the extent permitted by law, will continue to accrue, and holders of Series B
Preferred Securities  will be  required  to accrue  interest income  for  United
States  Federal  income  tax  purposes.  See  "Certain  Terms  of  the  Series B
Debentures --  Option to  Extend  Interest Payment  Period" and  "United  States
Taxation  -- Potential Extension  of Interest Payment  Period and Original Issue
Discount."
 
    The payment of distributions, out of moneys held by the Series B Issuer, and
payments upon liquidation of the Series B  Issuer or the redemption of Series  B
Preferred Securities, as set forth below, are guaranteed to the extent set forth
herein  by Western Resources  (the "Series B Guarantee").  See "Certain Terms of
the Series B Guarantee." If Western Resources fails to make interest payments on
the Series B Debentures held  by the Series B Issuer,  the Series B Issuer  will
have  insufficient  funds  to  pay  distributions  on  the  Series  B  Preferred
Securities. The Series B Guarantee does not cover payment of distributions  when
the Series B Issuer does not have sufficient funds to pay such distributions. In
such  event,  the remedy  of a  holder of  Series B  Preferred Securities  is to
enforce the rights of the Series B Issuer under the Series B Debentures held  by
the Series B Issuer. Western Resources' obligations under the Series B Guarantee
are  subordinate and  junior in  right of  payment to  all other  liabilities of
Western Resources except trade credit and any liabilities that may be made  pari
passu  with or subordinate  to the Series  B Guarantee expressly  by their terms
("Senior Indebtedness"). Wilmington Trust Company is the Property Trustee of the
Series B Issuer and the Guarantee Trustee of the Company.
 
    The Series B Preferred Securities  are subject to mandatory redemption  upon
repayment of the Series B Debentures at maturity or their earlier redemption, in
whole or in part. See "Description of the Preferred Securities -- Redemption" in
the  accompanying Prospectus. Western Resources will have the option at any time
on or after                , 2001 to redeem, in  whole or in part, the Series  B
Debentures,  and will  also have  the right  at any  time, upon  occurrence of a
Special Event (as  defined herein), to  redeem, in  whole but not  in part,  the
Series  B Debentures. See "Description of the Debentures -- Optional Redemption"
in the accompanying Prospectus.
 
    The Series B Debentures  are subordinate and junior  in right of payment  to
all  Senior Indebtedness  of Western  Resources. As  of March  31, 1996, Western
Resources had approximately $2.1 billion principal amount of Senior Indebtedness
outstanding. The  terms  of  the  Series  B  Debentures  do  not  limit  Western
Resources'  ability to incur additional Senior Indebtedness. See "Description of
the Debentures -- Subordination" in the accompanying Prospectus.
 
    In the event of the liquidation of  the Series B Issuer, the holders of  the
Series  B Preferred  Securities will be  entitled to receive  for each Preferred
Security a liquidation preference of $25 (the "Liquidation Amount") plus accrued
and unpaid distributions thereon to the date of payment and interest thereon, to
the extent permitted by law, subject to certain limitations. See "Description of
the Preferred Securities  -- Liquidation Distribution  Upon Dissolution" in  the
accompanying Prospectus.
 
    The  Series B Preferred Securities have been approved for listing on the New
York Stock Exchange, subject to notice of issuance, under the symbol "WR PrB."
 
    The  Series  B  Preferred  Securities  will  be  represented  by  a   global
certificate  registered in the  name of The Depository  Trust Company ("DTC") or
its nominee. Beneficial interests in the  Series B Preferred Securities will  be
shown  on,  and  transfers  thereof  will  be  effected  only  through,  records
maintained by Participants (as defined  in the accompanying Prospectus) in  DTC.
Except  as described herein, Series B  Preferred Securities in certificated form
will not be issued in exchange  for the global certificate. See "Description  of
the  Preferred Securities  -- Book-Entry-Only  Issuance --  The Depository Trust
Company" in the accompanying Prospectus.
 
                                ----------------
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS  WHICH  STABILIZE OR  MAINTAIN  THE MARKET  PRICE  OF THE  SERIES B
PREFERRED SECURITIES OFFERED HEREBY AT LEVELS ABOVE THOSE WHICH MIGHT  OTHERWISE
PREVAIL  IN THE OPEN MARKET.  SUCH TRANSACTIONS MAY BE  EFFECTED ON THE NEW YORK
STOCK EXCHANGE, IN THE OVER-THE-COUNTER  MARKET OR OTHERWISE. SUCH  STABILIZING,
IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                      S-2
<PAGE>
                               PROSPECTUS SUMMARY
 
    The  following  summary  information is  qualified  in its  entirety  by the
detailed information and financial statements incorporated herein by reference.
 
                                  THE OFFERING
 
<TABLE>
<S>                                 <C>
Securities Offered................  %  Cumulative  Quarterly  Income  Preferred  Securities,
                                    Series B.
Distribution Payment Dates........  March  31,  June  30,  September  30  and  December  31,
                                    commencing                     , subject to deferral  as
                                    described herein.
Redemption........................  At  the option of Western Resources at $25 per Preferred
                                    Security, in whole or in part,  on or after            ,
                                    2001,  or, in whole but not in part, upon the occurrence
                                    of a Special Event (as defined herein).
Use of Proceeds...................  Proceeds from  this offering  will  be used  by  Western
                                    Resources for the repayment of certain of its short-term
                                    debt and for general corporate purposes.
 
                                  WESTERN RESOURCES, INC.
 
Principal Business................  Supplying electric and natural gas utility service
Utility Service Area..............  Kansas  (electric and gas  utility service) and Oklahoma
                                    (gas utility service)
Approximate Customers during        Electric: 601,000
1995..............................  Gas: 648,000
</TABLE>
 
                                      S-3
<PAGE>
                            WESTERN RESOURCES, INC.
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                       UNAUDITED THREE MONTHS
                                            YEAR ENDED DECEMBER 31,                        ENDED MARCH 31,
                          ----------------------------------------------------------- -------------------------
                            1991(1)     1992(2)      1993       1994(3)      1995         1995         1996
                          ----------- ----------- ----------- ----------- ----------- ------------ ------------
<S>                       <C>         <C>         <C>         <C>         <C>         <C>          <C>
INCOME STATEMENT DATA
Revenues.................  $1,162,178  $1,556,248  $1,909,359  $1,617,943  $1,572,071    $443,375     $555,622
Operating Income.........     129,621     239,169     292,063     269,546     275,384      69,441       75,273
Net Income...............      89,645     127,884     177,370     187,447     181,676      41,575       44,789
Earnings Applicable to
 Common Stock............      83,268     115,133     163,864     174,029     168,257      38,220       41,434
Average Common Shares
 Outstanding.............  34,566,170  52,271,932  59,294,091  61,617,873  62,157,125  61,746,996   63,163,715
Earnings Per Average
 Common Share............       $2.41       $2.20       $2.76       $2.82       $2.71       $0.62        $0.66
Ratios of Earnings to
 Fixed Charges...........        2.98        2.02        2.36        2.65        2.41
Ratios of Earnings to
 Combined Fixed Charges
 and Preferred and
 Preference Dividend
 Requirements............        2.61        1.84        2.14        2.37        2.18
</TABLE>
 
- ------------------
 
(1) Includes a special one-time dividend of $.18 per share paid on February  28,
    1991.  Includes cumulative effect to January 1,  1991 of a change in revenue
    recognition resulting in a $17.36 million ($.50 per share) increase.
 
(2) After giving effect to the acquisition  of Kansas Gas and Electric  Company,
    effective from March 31, 1992.
 
(3) After  giving  effect  to  the  sales  of  Western  Resources'  Missouri gas
    properties, effective from January 31, 1994 and February 28, 1994.
 
<TABLE>
<CAPTION>
                                                                       UNAUDITED
                                                                 AS OF MARCH 31, 1996
                                          -------------------------------------------------------------------
                                                     ACTUAL                          AS ADJUSTED
                                          ----------------------------   ------------------------------------
                                             AMOUNT        PERCENTAGE       AMOUNT                PERCENTAGE
                                          -------------   ------------   -------------           ------------
                                                                (DOLLARS IN THOUSANDS)
<S>                                       <C>             <C>            <C>                     <C>
SUMMARY OF CAPITALIZATION
Common Stock Equity.....................  $   1,575,188          44.8%   $  $1,575,188                  44.6%
Cumulative Preferred Stock Not Subject
 to Mandatory Redemption................         24,858           0.7           24,858                   0.7
Preference Stock Subject to Mandatory
 Redemption.............................        150,000           4.3           50,000(2)                1.4
Company-obligated Mandatorily Redeemable
 Preferred Securities of Subsidiary
 Trusts holding solely Company
 Subordinated Debt Securities(1)........        100,000           2.8          220,000                   6.2
Long-term Debt:
  First Mortgage Bonds..................        841,000                        841,000
  Pollution Control Bonds...............        521,682                        521,682
  Revolving Credit Agreement............        325,000                        325,000
    Less:
      Unamortized Premium and Discount
       (Net)............................          5,490                          5,490
      Long-term Debt Due Within One
       Year.............................         16,000                         16,000
                                          -------------                  -------------
        Total Long-term Debt............      1,666,192          47.4        1,666,192                  47.1
                                          -------------         -----    -------------                 -----
  Total Capitalization..................  $   3,516,238         100.0%   $   3,536,238                 100.0%
                                          -------------         -----    -------------                 -----
                                          -------------         -----    -------------                 -----
Current Liabilities:
  Long-term Debt........................  $      16,000                  $      16,000
  Short-term Debt.......................  $     342,300                  $     332,000(2)
</TABLE>
 
- ------------------
 
(1) As described herein,  the assets of  the Series B  Issuer will include  $120
    million  of        % Series  B  Debentures of  Western Resources  which will
    constitute approximately 97% of the total assets of the Series B Issuer.
 
(2) Western Resources redeemed  on July 1,  1996 all $100  million of its  8.50%
    Preference Stock due July 1, 2016. Short-term debt reflects $5.67 million of
    premium incurred in the redemption of the 8.50% Preference Stock, as well as
    the underwriting commission and expenses associated with this issuance.
 
                                      S-4
<PAGE>
                                  RISK FACTORS
 
    PROSPECTIVE  PURCHASERS OF  SERIES B  PREFERRED SECURITIES  SHOULD CAREFULLY
REVIEW THE INFORMATION CONTAINED ELSEWHERE IN THIS PROSPECTUS SUPPLEMENT AND THE
ACCOMPANYING PROSPECTUS AND SHOULD PARTICULARLY CONSIDER THE FOLLOWING MATTERS:
 
    SUBORDINATION OF  SERIES  B GUARANTEE  AND  SERIES B  DEBENTURES.    Western
Resources'  obligations  under the  Series B  Guarantee and  under the  Series B
Debentures are  subordinate  and  junior  in right  of  payment  to  all  Senior
Indebtedness  other  than  indebtedness that  may  be  made pari  passu  with or
subordinate to the Series B Guarantee  and the Series B Debentures expressly  by
their  terms. As  of March  31, 1996,  Western Resources  had approximately $2.1
billion principal  amount of  indebtedness for  borrowed money  and  capitalized
lease obligations constituting Senior Indebtedness outstanding on a consolidated
basis.  There are no  terms of the  Series B Preferred  Securities, the Series B
Debentures or the Series  B Guarantee that limit  Western Resources' ability  to
incur  additional  Senior Indebtedness.  See "Description  of the  Guarantees --
Status of the Guarantees" and "Description of the Debentures --  Subordination,"
each as set forth in the accompanying Prospectus.
 
    The  ability of  the Series  B Issuer  to pay  amounts due  on the  Series B
Preferred Securities is solely dependent upon Western Resources making  payments
on the Series B Debentures as and when required.
 
    OPTION  TO  EXTEND  INTEREST  PAYMENT  PERIOD;  TAX  CONSEQUENCES.   Western
Resources has the right under the Indenture (as defined herein) to extend,  from
time  to time,  the interest  payment period  on the  Series B  Debentures for a
period not exceeding 20 consecutive quarters.  Upon the termination of any  such
extended  interest  payment period  and  the payment  of  all amounts  then due,
Western Resources may select a new extended interest payment period, subject  to
the  requirements described  herein. During  any such  extended interest payment
period, quarterly distributions on  the Series B  Preferred Securities would  be
deferred  (but would continue to accrue with additional distributions thereon to
the extent permitted by law) by the  Series B Issuer. In the event that  Western
Resources  exercises this right,  during such period  it may not  declare or pay
dividends or distributions  (other than  dividends or  distributions payable  in
common stock of Western Resources or other securities ranking junior in right of
payment  to the Series B Debentures) on, or redeem, purchase, acquire, or make a
liquidation payment with respect  to, any of its  capital stock or any  security
ranking  pari  passu  with  or  junior  in right  of  payment  to  the  Series B
Debentures, or make any guarantee payment  with respect to the foregoing  (other
than  pro rata payments under the Guarantees) or repurchase, or cause any of its
subsidiaries to repurchase, any security of Western Resources ranking pari passu
with or  junior in  right of  payment to  the Series  B Debentures  (except  for
payments  made on  any series  of Debentures  upon the  stated maturity  of such
Debentures); provided that  Western Resources may  redeem, purchase, acquire  or
make  a liquidation  payment with  respect to  any of  its capital  stock or any
security ranking pari passu with or junior  in right of payment to the Series  B
Debentures,  make  any  guarantee  payment  with  respect  to  the  foregoing or
repurchase, or cause  any of  its subsidiaries  to repurchase,  any security  of
Western  Resources ranking pari passu with or  junior in right of payment to the
Series B  Debentures with  securities  (or the  proceeds  from the  issuance  of
securities)  having  no  higher ranking  than  the  capital stock  or  the other
securities which are to be redeemed, purchased, acquired, with respect to  which
a  liquidation payment is to be made, to which a guarantee payment is to be made
with respect to  the foregoing  or which  are to  be repurchased.  Prior to  the
termination  of any such extended interest payment period, Western Resources may
further extend the interest payment period, provided that such extended interest
payment period, together with all  previous and further extensions thereof,  may
not  exceed  20 consecutive  quarters and  that  such extended  interest payment
period may not extend  beyond the maturity  or redemption date  of the Series  B
Debentures. Upon the termination of any extended interest payment period and the
payment  of all amounts  then due, Western  Resources may select  a new extended
interest payment  period,  subject to  the  foregoing requirements.  If  Western
Resources  should determine to  exercise its extension right  in the future, the
market price of the Series B Preferred Securities is likely to be affected.  The
Series B Issuer and Western Resources believe that such
 
                                      S-5
<PAGE>
an  extension  of an  interest  payment period  on  the Series  B  Debentures is
unlikely to occur. See  "Certain Terms of the  Series B Preferred Securities  --
Distributions" and "Certain Terms of the Series B Debentures -- Option to Extend
Interest Payment Period."
 
    Should an interest payment period be extended, Series B Preferred Securities
holders  will continue  to recognize interest  income for  United States Federal
income tax  purposes. As  a result,  such holders  will be  required to  include
accruing  interest in gross income for United States Federal income tax purposes
in advance of  the actual receipt  of such interest.  Furthermore, such  holders
will  not receive the related actual interest  payments from the Series B Issuer
if they dispose of their Series B Preferred Securities prior to the record  date
for payment of distributions. See "United States Taxation -- Potential Extension
of Interest Payment Period and Original Issue Discount."
 
    RIGHTS  UNDER  THE SERIES  B  GUARANTEE.   The  Series B  Guarantee  will be
qualified as an indenture under the Trust Indenture Act of 1939, as amended (the
"Trust Indenture Act"). Wilmington Trust  Company will act as indenture  trustee
under  the Series  B Guarantee  for the  purposes of  compliance with  the Trust
Indenture Act (the  "Guarantee Trustee").  The Guarantee Trustee  will hold  the
Series  B Guarantee  for the benefit  of the  holders of the  Series B Preferred
Securities and will  also be the  trustee for  the Series B  Debentures and  the
Property Trustee (as defined herein).
 
    The  Series B Guarantee is limited to  a guarantee, on a subordinated basis,
to the holders of the Series B Preferred Securities, of the payment (but not the
collection) of (i) any accrued and  unpaid distributions required to be paid  on
the  Series B Preferred Securities, if and only  to the extent that the Series B
Issuer has funds sufficient to make payment therefor, (ii) the Redemption  Price
(as  defined  herein),  including  all accrued  and  unpaid  distributions, with
respect to Series B Preferred Securities  called for redemption by the Series  B
Issuer,  if and only to the extent that the Series B Issuer has funds sufficient
to make payment therefor, and (iii) upon a voluntary or involuntary dissolution,
winding up or termination of the Series B Issuer (other than in connection  with
a redemption of all of the Series B Preferred Securities), the lesser of (a) the
aggregate  Liquidation Amount  and all accrued  and unpaid  distributions on the
Series B Preferred Securities to the date of payment, to the extent the Series B
Issuer has funds sufficient to make such  payment, and (b) the amount of  assets
of  the Series B Issuer  remaining available for distribution  to holders of the
Series B Preferred Securities in liquidation of the Series B Issuer. The holders
of a  majority  in  aggregate  Liquidation Amount  of  the  Series  B  Preferred
Securities have the right to direct the time, method and place of conducting any
proceeding  for any remedy available  to the Guarantee Trustee  or to direct the
exercise of any trust  or power conferred upon  the Guarantee Trustee under  the
Series  B Guarantee.  If the  Guarantee Trustee  fails to  enforce the  Series B
Guarantee, any holder  of Series B  Preferred Securities may  institute a  legal
proceeding  directly against Western  Resources to enforce  such holder's rights
under the  Series  B Guarantee  without  first instituting  a  legal  proceeding
against  the  Series B  Issuer, the  Guarantee  Trustee or  any other  person or
entity. If Western Resources were to default on its obligations under the Series
B Debentures, the Series B Issuer would lack available funds for the payment  of
distributions  or  amounts  payable  on redemption  of  the  Series  B Preferred
Securities or otherwise,  and in such  event holders of  the Series B  Preferred
Securities  would not be able to rely upon the Series B Guarantee for payment of
such amounts. In  such event, if  both the  Debenture Trustee and  the Series  B
Issuer,  as the holder of the Series B Debentures, fail to enforce the rights of
the Series B Issuer under the Series  B Debentures, the holders of at least  25%
in  aggregate  Liquidation  Amount of  the  Series B  Preferred  Securities then
outstanding shall have the right  to enforce the rights  of the Series B  Issuer
under  the Series B Debentures. See "Description  of the Guarantees -- Status of
the Guarantees" and "Description  of the Debentures  -- Subordination," each  as
set forth in the accompanying Prospectus.
 
    SPECIAL  EVENT  REDEMPTION.   Upon  the occurrence  of  a Special  Event (as
defined herein),  Western  Resources  has  the right  to  redeem  the  Series  B
Debentures,  in whole but not  in part, in which event  the Series B Issuer will
redeem the Series B Preferred Securities. See "Western Resources, Inc. -- Recent
Developments,"  "Certain  Terms  of  the   Series  B  Preferred  Securities   --
Redemption" and "-- Special Event Redemption or Distribution."
 
                                      S-6
<PAGE>
    LIMITED  VOTING RIGHTS.  Holders of  Series B Preferred Securities will have
limited voting rights, and,  except upon the occurrence  of an Event of  Default
(as  defined herein) under the Series B Trust Agreement, will not be entitled to
vote to appoint, remove  or replace the Property  Trustee or the  Administrative
Trustees  (as  defined herein).  Such voting  rights  are vested  exclusively in
Western Resources, as the Depositor of the Series B Issuer, unless and until  an
Event  of  Default  has occurred  and  is  continuing. See  "Description  of the
Preferred  Securities  --  Events  of  Default;  Notice"  in  the   accompanying
Prospectus.
 
    TRADING  CHARACTERISTICS OF  SERIES B  PREFERRED SECURITIES.   The  Series B
Preferred Securities  have been  approved  for listing  on  the New  York  Stock
Exchange, subject to notice of issuance, under the symbol "WR PrB." The Series B
Preferred  Securities are expected to  trade at a price  that takes into account
the value, if any,  of accrued and unpaid  distributions; thus, purchasers  will
not  pay  and sellers  will not  receive  any accrued  and unpaid  interest with
respect to their undivided  interests in Series B  Debentures owned through  the
Series  B Preferred Securities that is not  included in the trading price of the
Series B Preferred Securities. However, interest on the Series B Debentures will
be included in the gross income of U.S. Holders (as defined herein) of Series  B
Preferred  Securities as it  accrues, rather than  when it is  paid. See "United
States  Taxation  --  Income  from  Series  B  Preferred  Securities"  and   "--
Disposition of Series B Preferred Securities."
 
    Because  the Series B  Preferred Securities pay  a dividend at  a fixed rate
based upon  the fixed  interest rate  payable on  the Series  B Debentures,  the
trading price of the Series B Preferred Securities may decline if interest rates
rise.
 
    HOLDING  COMPANY  STRUCTURE.   A significant  portion  of the  operations of
Western Resources are conducted through its subsidiaries, principally Kansas Gas
and Electric Company ("KG&E"). Except to  the extent that Western Resources  may
itself  be a creditor with recognized claims against its subsidiaries, claims of
the creditors of such subsidiaries will have priority with respect to the assets
and earnings  of such  subsidiaries  over the  claims  of creditors  of  Western
Resources,  including  claims under  the Series  B Debentures  and the  Series B
Guarantee, even  though such  subsidiary obligations  do not  constitute  Senior
Indebtedness.  The  liabilities  of Western  Resources'  subsidiaries aggregated
approximately  $1.7  billion,   and  the  assets   of  such  subsidiaries   were
approximately $4.1 billion as of March 31, 1996.
 
    In  addition, in  the event of  a default  on Western Resources'  debt or an
insolvency, liquidation or other reorganization of Western Resources,  creditors
will have no right to proceed against the assets of its subsidiaries or to cause
their liquidation under Federal or state bankruptcy laws.
 
                          WESTERN RESOURCES CAPITAL II
 
    Western  Resources Capital II is a statutory business trust formed under the
Delaware Business  Trust Act  pursuant  to (i)  a  Trust Agreement  executed  by
Western Resources, as Depositor of the Series B Issuer, and the Property Trustee
and  (ii) the filing  of a Certificate  of Trust with  the Delaware Secretary of
State on October 12, 1995. Such Trust Agreement will be amended and restated  in
its  entirety  (as so  amended  and restated,  the  "Series B  Trust Agreement")
substantially in the form filed as  an exhibit to the Registration Statement  of
which this Prospectus Supplement is a part. The Series B Trust Agreement will be
qualified  as an indenture  under the Trust  Indenture Act. The  Series B Issuer
exists for  the  exclusive  purposes  of (i)  issuing  the  Series  B  Preferred
Securities  and the Series  B Common Securities  representing trust interests in
the Series B Issuer, (ii) purchasing the  Series B Debentures with the Series  B
Common  Securities and  the proceeds  from the  sale of  the Series  B Preferred
Securities and  (iii)  engaging only  in  those other  activities  necessary  or
incidental  thereto. All  of the  Series B  Common Securities  will be  owned by
Western Resources. Western Resources will covenant not to transfer ownership  of
the  Series B Common Securities to any person other than an Affiliate of Western
Resources or a successor of Western Resources as permitted under the  Indenture;
provided  that no such  transfer shall result  in (x) the  Series B Issuer being
considered an "investment company" that is  required to be registered under  the
Investment Company Act of 1940, as amended, or (y) the Series B Issuer not being
 
                                      S-7
<PAGE>
taxed  as a  grantor trust  for United States  Federal income  tax purposes. The
Series B  Common Securities  will rank  pari passu,  and payments  will be  made
thereon  pro rata, with the Series B  Preferred Securities, except that upon the
occurrence and  continuance of  an Event  of Default  under the  Series B  Trust
Agreement,  the  rights of  the holders  of  the Series  B Common  Securities to
payment in respect  of distributions and  payments upon liquidation,  redemption
and otherwise will be subordinate and junior to the rights of the holders of the
Series  B Preferred Securities.  Western Resources will  acquire Series B Common
Securities having  an aggregate  Liquidation Amount  equal to  3% of  the  total
capital of the Series B Issuer. The Series B Issuer will terminate on          ,
2036  unless earlier terminated as provided in the Series B Trust Agreement. The
Series B Issuer's business and affairs will be conducted by the Property Trustee
and the Administrative Trustees. Western Resources, as Depositor of the Series B
Issuer, or, if an Event of Default  has occurred and is continuing, the  holders
of  at  least  a  majority  in the  aggregate  Liquidation  Amount  of  the then
outstanding Series B Trust Securities (as  defined herein), will be entitled  to
appoint,  remove or  replace the  Trustees (as defined  herein) of  the Series B
Issuer.
 
    The duties and obligations of the Trustees shall be governed by the Series B
Trust Agreement. Steven L. Kitchen, James  A. Martin and John K. Rosenberg,  all
officers  of  Western Resources,  will be  appointed as  Administrative Trustees
pursuant to the terms of the Series B Trust Agreement. Under the Series B  Trust
Agreement,  the  Administrative Trustees  will  have certain  duties  and powers
including, but not limited to, the delivery of certain notices to the holders of
the Series  B Preferred  Securities, the  appointment of  the Paying  Agent  (as
defined  in the  accompanying Prospectus) and  the Registrar (as  defined in the
accompanying Prospectus)  and  the registering  of  transfers of  the  Series  B
Preferred  Securities.  Under the  Series  B Trust  Agreement,  Wilmington Trust
Company, as the Property Trustee, will have certain duties and powers including,
but not limited to, holding legal title to the Series B Debentures on behalf  of
the  Series  B Trust,  the collection  of payments  in respect  of the  Series B
Debentures, maintenance of the Payment Account (as defined in the Series B Trust
Agreement), the  sending  of  default  notices with  respect  to  the  Series  B
Preferred Securities and the distribution of the assets of the Series B Trust in
the  event  of a  winding up  of the  Series  B Trust.  See "Description  of the
Preferred Securities" in the accompanying Prospectus.
 
    Western Resources has  agreed to pay  all fees and  expenses related to  the
Series B Issuer and the offering of the Series B Preferred Securities.
 
                            WESTERN RESOURCES, INC.
 
GENERAL
 
    Western  Resources is a combination electric  and natural gas public utility
engaged in  the  generation, transmission,  distribution  and sale  of  electric
energy  in Kansas  and the  purchase, distribution,  transportation and  sale of
natural gas in Kansas and Oklahoma. The Company was incorporated under the  laws
of the State of Kansas in 1924.
 
    The Company conducts its non-regulated business through the Westar Companies
and  Mid  Continent Market  Center, Inc.  These  businesses include  natural gas
compression, transportation, storage, marketing, processing, gathering  services
and  electric power marketing, and investments  in energy and technology related
businesses. The Company's principal executive offices are located at 818  Kansas
Avenue, Topeka, Kansas 66612 and its telephone number is (913) 575-6300.
 
RECENT DEVELOPMENTS
 
    On  March 19, 1996, President Clinton  proposed certain tax law changes that
would, among  other things,  generally deny  corporate issuers  a deduction  for
interest  in respect of certain debt obligations  issued on or after December 7,
1995 (the "Proposed Legislation") if such  debt obligations have a maximum  term
in  excess  of  20 years  and  are not  shown  as indebtedness  on  the issuer's
applicable consolidated  balance sheet.  In addition,  the Proposed  Legislation
would  deny issuers an interest deduction on any debt instrument with a weighted
average maturity  of more  than 40  years.  On March  29, 1996,  Senate  Finance
Committee  Chairman  William V.  Roth, Jr.  and House  Ways and  Means Committee
 
                                      S-8
<PAGE>
Chairman Bill Archer issued a joint statement (the "Joint Statement") indicating
their intent  that  certain  legislative  proposals  initiated  by  the  Clinton
administration,  including  the Proposed  Legislation,  that may  be  adopted by
either of the tax-writing  committees of Congress would  have an effective  date
that  is no earlier  than the date of  "appropriate Congressional action." There
can be no assurances, however, that the effective date guidance contained in the
Joint Statement will be incorporated into the Proposed Legislation, if  enacted,
or  that  other legislation  enacted after  the date  hereof will  not otherwise
adversely affect the ability of Western Resources to deduct the interest payable
on the Series B Debentures.
 
    If the  tax  law  changed,  as  a result  of  the  Proposed  Legislation  or
otherwise,  so that  in Western Resources'  judgment it would  be precluded from
deducting interest on the Series B Debentures, Western Resources could,  subject
to  receiving an Opinion of Counsel to the effect that a relevant tax law change
(as described in the Prospectus) had occurred, redeem the Series B Debentures in
whole, thereby  causing  a  mandatory  redemption  of  the  Series  B  Preferred
Securities  in whole at a price of  $25 per Preferred Security, plus accrued but
unpaid distributions. Western Resources presently anticipates that, as permitted
by the terms of the  Series B Debentures at the  time of pricing and subject  to
market  and other  conditions, it  would cause such  redemption of  the Series B
Preferred Securities  if  the tax  law  changed, as  a  result of  the  Proposed
Legislation  or  otherwise,  in a  manner  that  would not  permit  the interest
deduction.
 
    Western Resources has pending an exchange  offer for all of the  outstanding
shares  of common stock of  Kansas City Power &  Light Company ("KCPL") in which
each share of KCPL common stock may  be exchanged for $31 of Western  Resources'
common  stock  subject  to  certain limitations.  For  further  information, see
Western Resources' Quarterly Report on Form 10-Q for the quarter ended March 31,
1996 and its Current Report on Form 8-K dated June 17, 1996.
 
    Western Resources owns approximately 24% of the outstanding common shares of
ADT Limited, a corporation organized under  the laws of Bermuda ("ADT"), and  as
such  applies the equity  method of accounting.  Western Resources holds through
its subsidiary the common shares of ADT for investment purposes and  continually
reviews its investment in ADT and, based on its evaluation of market conditions,
applicable   regulatory  requirements,  ADT's   business  prospects  and  future
developments, it may  from time to  time determine to  increase or decrease  its
equity  position in ADT. For further  information, see Western Resources' Annual
Report on Form 10-K for the year ended December 31, 1995.
 
                                COVERAGE RATIOS
 
    The following table sets  forth the ratios of  earnings to fixed charges  of
Western  Resources and its subsidiaries for each  of the years 1991 through 1995
and for the twelve months ended March 31, 1996.(1)
 
<TABLE>
<CAPTION>
                                                                      UNAUDITED
                   YEAR ENDED DECEMBER 31,                          TWELVE MONTHS
- -------------------------------------------------------------           ENDED
  1991(2)      1992(3)      1993       1994(4)       1995          MARCH 31, 1996
- -----------  -----------  ---------  -----------  -----------  -----------------------
<S>          <C>          <C>        <C>          <C>          <C>
      2.98         2.02        2.36        2.65         2.41               2.38
</TABLE>
 
- --------------
(1) Earnings are deemed to consist of net income to which has been added  income
    taxes  (including net  deferred investment  tax credits)  and fixed charges.
    Fixed charges consist of all interest on indebtedness, amortization of  debt
    discount  and expense, and the portion of rental expense which represents an
    interest factor.
 
(2)
    Includes a special one-time dividend of $.18 per share paid on February  28,
    1991.  Includes cumulative effect to January 1,  1991 of a change in revenue
    recognition resulting in a $17.36 million ($.50 per share) increase.
 
(3) After giving effect  to the acquisition  of KG&E, effective  from March  31,
    1992.
 
(4) After  giving  effect  to  the  sales  of  Western  Resources'  Missouri gas
    properties, effective from January 31, 1994 and February 28, 1994.
 
                                      S-9
<PAGE>
    The following table  sets forth  the ratios  of earnings  to combined  fixed
charges  and preferred and preference stock dividends for each of the years 1991
through 1995 and for the twelve months ended March 31, 1996.(1)
 
<TABLE>
<CAPTION>
                                                                 UNAUDITED
                  YEAR ENDED DECEMBER 31,                      TWELVE MONTHS
- -----------------------------------------------------------        ENDED
  1991(2)      1992(3)      1993       1994(4)      1995      MARCH 31, 1996
- -----------  -----------  ---------  -----------  ---------  -----------------
<S>          <C>          <C>        <C>          <C>        <C>
      2.61         1.84        2.14        2.37        2.18           2.16
</TABLE>
 
- --------------
(1) Earnings are deemed to consist of net income to which has been added  income
    taxes  (including net  deferred investment  tax credits)  and fixed charges.
    Fixed charges consist of all interest on indebtedness, amortization of  debt
    discount  and expense, and the portion of rental expense which represents an
    interest factor. Preferred and  preference dividend requirements consist  of
    an  amount equal  to the  pre-tax earnings which  would be  required to meet
    dividend requirements on preferred and preference stock.
 
(2) Includes a special one-time dividend of $.18 per share paid on February  28,
    1991.  Includes cumulative effect to January 1,  1991 of a change in revenue
    recognition resulting in a $17.36 million ($.50 per share) increase.
 
(3) After giving effect  to the acquisition  of KG&E, effective  from March  31,
    1992.
 
(4) After  giving  effect  to  the  sales  of  Western  Resources'  Missouri gas
    properties, effective from January 31, 1994 and February 28, 1994.
 
                                USE OF PROCEEDS
 
    The Series  B  Issuer will  use  the proceeds  from  this offering  of  $120
million,  together with the Series B Common Securities, to purchase the Series B
Debentures. Western Resources will  use the cash proceeds  from the sale of  the
Series  B  Debentures,  net  of the  Underwriters'  compensation  and  the other
expenses of this offering, for the  repayment of certain of its short-term  debt
and  for general corporate purposes. As of  March 31, 1996, such short-term debt
had a  weighted average  interest  rate of  approximately  5.55% per  annum  and
maturities within six months of its date of issuance.
 
               CERTAIN TERMS OF THE SERIES B PREFERRED SECURITIES
 
GENERAL
 
    The  following  summary of  certain  terms and  provisions  of the  Series B
Preferred Securities does  not purport  to be complete  and is  subject to,  and
qualified  in its entirety  by reference to,  the Series B  Trust Agreement. The
form of  the Series  B Trust  Agreement  has been  filed as  an exhibit  to  the
Registration  Statement of which this Prospectus Supplement and the accompanying
Prospectus are a  part. See  "Description of  the Preferred  Securities" in  the
accompanying Prospectus.
 
DISTRIBUTIONS
 
    The  Series B Preferred Securities  represent undivided preferred beneficial
interests in the assets of  the Series B Issuer,  and the distributions on  each
Series  B Preferred Security are payable at the rate set forth on the cover page
of this Prospectus  Supplement, payable, except  in the event  of an  extension,
quarterly  in arrears on March 31, June 30, September 30 and December 31 of each
year. Distributions in arrears  after the quarterly  payment date therefor  will
accumulate  additional distributions  thereon (to  the extent  permitted by law)
compounded quarterly at the rate per annum  set forth on the cover page of  this
Prospectus Supplement. The term "distributions" as used herein shall include any
such additional distributions to the extent permitted by law. Distributions will
accrue  from the date of original issuance of the Series B Preferred Securities.
The amount of distributions payable for any period will be computed on the basis
of a 360-day year  of twelve 30-day  months and, for any  period shorter than  a
full monthly period, shall be computed on the basis of the actual number of days
elapsed in such period.
 
                                      S-10
<PAGE>
    So  long as an Event of Default under  the Indenture has not occurred and is
continuing, Western Resources has the right at any time and from time to time to
extend the interest payment period on the Series B Debentures for not more  than
20  consecutive  quarters, provided  that any  such  Extension Period  shall not
extend beyond the maturity date or  redemption date of the Series B  Debentures.
During  any Extension Period  quarterly distributions on  the Series B Preferred
Securities would be deferred by the  Series B Issuer, would continue to  accrue,
and  holders  of  Series B  Preferred  Securities  would be  required  to accrue
interest income  for United  States Federal  income tax  purposes. See  "Certain
Terms  of the Series B  Debentures -- Option to  Extend Interest Payment Period"
and "United States Taxation  -- Potential Extension  of Interest Payment  Period
and Original Issue Discount." In the event that Western Resources exercises this
right,  during  such  period  it  may  not  declare  or  pay  any  dividends  or
distributions (other than dividends or distributions payable in common stock  of
Western  Resources or other securities ranking junior in right of payment to the
Series B Debentures)  on, or redeem,  purchase, acquire, or  make a  liquidation
payment  with respect to, any of its  capital stock or any security ranking pari
passu with or junior in right of payment to the Series B Debentures, or make any
guarantee payment with respect  to the foregoing (other  than pro rata  payments
under  the  Guarantees)  or repurchase,  or  cause  any of  its  subsidiaries to
repurchase, any security of Western Resources ranking pari passu with or  junior
in  right of payment to the Series B Debentures (except for payments made on any
series of Debentures upon the stated maturity of such Debentures); provided that
Western Resources may redeem,  purchase, acquire or  make a liquidation  payment
with respect to any of its capital stock or any security ranking pari passu with
or  junior in right  of payment to  the Series B  Debentures, make any guarantee
payment with  respect  to the  foregoing  or repurchase,  or  cause any  of  its
subsidiaries to repurchase, any security of Western Resources ranking pari passu
with  or junior in right  of payment to the  Series B Debentures with securities
(or the proceeds from the issuance of securities) having no higher ranking  than
the  capital stock or the other securities  which are to be redeemed, purchased,
acquired, with respect to which a liquidation payment is to be made, to which  a
guarantee payment is to be made with respect to the foregoing or which are to be
repurchased.  This covenant effectively requires that an interest payment on one
series of Debentures may be extended only if the interest periods on all  series
of  Debentures  are likewise  extended.  Prior to  the  termination of  any such
extended interest  payment  period, Western  Resources  may further  extend  the
interest  payment period, provided that such  Extension Period together with all
such previous  and further  extensions  thereof may  not exceed  20  consecutive
quarters  or  extend beyond  the maturity  or  redemption date  of the  Series B
Debentures. Upon the termination of any Extension Period and the payment of  all
amounts  then due, Western Resources may  select a new extended interest payment
period, subject to the  above requirements. See "Certain  Terms of the Series  B
Debentures  --  Option to  Extend Interest  Payment  Period" and  "United States
Taxation -- Potential Extension  of Interest Payment  Period and Original  Issue
Discount."
 
    Western  Resources has no current intention of exercising its right to defer
payments of distributions on the Series B Preferred Securities by extending  the
interest payment period on the Series B Debentures.
 
REDEMPTION
 
    Upon  the payment of  the Series B  Debentures, whether at  maturity or upon
earlier redemption as provided in the Indenture, the proceeds from such  payment
will  be applied  by the Property  Trustee to  redeem a Like  Amount (as defined
below) of the Series B Common Securities and the Series B Preferred  Securities,
upon not less than 30 nor more than 90 days' notice, at a Redemption Price equal
to  the aggregate Liquidation Amount  plus accumulated and unpaid distributions,
plus additional distributions  thereon to the  extent permitted by  law, to  the
Redemption Date. See "Certain Terms of the Series B Debentures -- Redemption."
 
    Western  Resources has the right to redeem the Series B Debentures (a) on or
after                 , 2001, in whole or in part, or (b) at any time, in  whole
but  not in part,  upon the occurrence of  a Tax Event  or an Investment Company
Event (each as  defined below,  a "Special  Event"), subject  to the  conditions
described under "-- Special Event Redemption or Distribution," below.
 
                                      S-11
<PAGE>
SPECIAL EVENT REDEMPTION OR DISTRIBUTION
 
    If  a Special Event shall occur and be continuing with respect to the Series
B Issuer or the Series B  Preferred Securities, Western Resources has the  right
to  (i) redeem the  Series B Debentures in  whole (but not  in part) and thereby
cause a mandatory redemption of the Series B Preferred Securities in whole  (but
not  in part) at the Redemption Price within 90 days following the occurrence of
such Special Event, or (ii) terminate the Series B Issuer and cause the Series B
Debentures to be distributed,  subject to the receipt  of an Opinion of  Counsel
experienced  in such  matters to  the effect  that the  holders of  the Series B
Preferred Securities will not recognize gain  or loss for United States  Federal
income  tax purposes  as a result  of such  distribution, to the  holders of the
Series B Preferred Securities in liquidation of  the Series B Issuer. If at  any
time  the Series B Issuer is not or will  not be taxed as a grantor trust, but a
Tax Event has  not occurred, Western  Resources has the  right to terminate  the
Series  B Issuer and cause the Series B Debentures to be distributed, subject to
the receipt of an Opinion of Counsel  experienced in such matters to the  effect
that the holders of the Series B Preferred Securities will not recognize gain or
loss  for  United  States  Federal  income tax  purposes  as  a  result  of such
distribution, to the holders of the Series B Preferred Securities in liquidation
of the Series B Issuer. Under current  United States Federal income tax law  and
interpretations, if the Series B Trust is treated as a grantor trust at the time
of  the  distribution, such  a distribution  should  not be  a taxable  event to
holders of the Series B Preferred Securities. Should there be a change in law, a
change in legal interpretation, a Special Event or other circumstances, however,
the termination could be a  taxable event to holders  of the Series B  Preferred
Securities.  See "United States Taxation --  Receipt of Series B Debentures Upon
Liquidation of the Series B Issuer." If Western Resources does not elect  either
option  (i)  or  (ii)  above,  the Series  B  Preferred  Securities  will remain
outstanding.
 
    "Tax Event" means the receipt by  the Series B Issuer or Western  Resources,
as the case may be, of an Opinion of Counsel (which may be counsel to the Series
B  Issuer,  Western Resources  or  an affiliate,  and  which must  be reasonably
acceptable to the Property  Trustee) experienced in such  matters to the  effect
that  a relevant tax  law change has  occurred after                 , 1996. For
purposes of the preceding sentence a relevant tax law change is any amendment or
change to (or officially  proposed amendment or change  to) the laws  (including
regulations  thereunder) of  the United States  or any  political subdivision or
taxing  authority  thereof,   or  the  publication   of  any  judicial   opinion
interpreting  such laws (and regulations) or  any written interpretation of such
laws (or  regulations)  by any  governmental  authority having  jurisdiction  to
enforce  or  administer  such  laws  (or  regulations)  (including  official and
unofficial opinions  purporting to  apply  such laws  and regulations  to  other
persons  who have issued  securities similar to the  Series B Debentures), which
amendment, change,  proposed  amendment  or change,  opinion  or  interpretation
could,  if  valid and  enacted  or applied  to the  Series  B Issuer  or Western
Resources, result in (i) the Series B Issuer, either currently or within 90 days
of the date thereof, becoming subject  to United States Federal income tax  with
respect  to interest received on the  Series B Debentures, (ii) interest payable
by Western Resources  on the Series  B Debentures attributable  to the Series  B
Preferred  Securities, either currently  or within 90 days  of the date thereof,
becoming nondeductible for United  States Federal income  tax purposes or  (iii)
the  Series B Issuer,  either currently or  within 90 days  of the date thereof,
becoming subject to  more than a  de minimis  amount of other  taxes, duties  or
other governmental charges.
 
    "Investment  Company  Event" means  the  occurrence of  a  change in  law or
regulation or  a change  in the  interpretation  or application  of any  law  or
regulation  by any  legislative body,  court, governmental  agency or regulatory
authority (a "Change in 1940 Act Law") to the effect that the Series B Issuer is
or will be considered an "investment company" that is required to be  registered
under  the Investment Company Act of 1940,  as amended, which Change in 1940 Act
Law becomes effective after             , 1996.
 
    "Like Amount"  means  (i) with  respect  to a  redemption  of the  Series  B
Preferred Securities and the Series B Common Securities (together, the "Series B
Trust  Securities"), Series B  Trust Securities having  an aggregate Liquidation
Amount  equal  to   the  principal  amount   of  Series  B   Debentures  to   be
contemporaneously  redeemed in accordance with the Indenture and the proceeds of
which will be used to pay the Redemption Price of such Series B Trust Securities
and (ii) with respect to a distribution of Series B
 
                                      S-12
<PAGE>
Debentures to  holders  of  Series  B Trust  Securities  in  connection  with  a
termination  or  liquidation  of  the  Series  B  Issuer  upon  the  bankruptcy,
dissolution or  liquidation of  a  holder of  Series  B Common  Securities,  the
occurrence  of a Special Event or in the event that the Series B Trust is not or
will not be taxed as a grantor trust but a Tax Event has not occurred, Series  B
Debentures  having a principal amount equal  to the aggregate Liquidation Amount
of the Series B Trust Securities in exchange for which such Series B  Debentures
are distributed.
 
LIQUIDATION AMOUNT
 
    The  Liquidation Amount payable on the  Series B Preferred Securities in the
event of any liquidation of  the Series B Issuer is  $25 per Series B  Preferred
Security,  plus accumulated and unpaid  distributions unless, in connection with
such liquidation, the Series B Debentures are distributed to the holders of  the
Series B Preferred Securities.
 
RIGHTS UNDER THE SERIES B GUARANTEE AND THE SERIES B DEBENTURES
 
    The Series B Guarantee will be a full guarantee with respect to the Series B
Preferred  Securities  from  the time  of  issuance  of the  Series  B Preferred
Securities, but will not apply to any payment of distributions or other  amounts
due  to the extent the Series B  Issuer does not have sufficient available funds
to pay such distributions or  other amounts due (which  will occur in the  event
that  Western Resources has failed to make a payment of principal or interest on
the Series B Debentures).  There are no  preconditions to a  holder of Series  B
Preferred  Securities instituting  a legal  proceeding directly  against Western
Resources to enforce such holder's rights  under the Series B Guarantee. If  the
Guarantee  Trustee fails to enforce the Series B Guarantee, any holder of Series
B Preferred Securities may institute a legal proceeding directly against Western
Resources to enforce such holder's rights  under the Series B Guarantee  without
first  instituting a legal proceeding against the Series B Issuer, the Guarantee
Trustee or any other person  or entity. To the  extent Western Resources was  to
default on its obligation to pay amounts payable on the Series B Debentures, the
Series  B  Issuer  would lack  sufficient  available  funds for  the  payment of
distributions on  or  amounts  payable  on redemption  of  the  Series  B  Trust
Securities  and, in  such event,  holders of  the Series  B Preferred Securities
would not be able to rely on the Series B Guarantee for payment of such amounts.
Instead, the remedy of  a holder of  Series B Preferred  Securities would be  to
enforce  the rights of the Series B Issuer under the Series B Debentures held by
the Series B Issuer. The above mechanisms and obligations relating to the Series
B Guarantee and the Series B Debentures and the obligations of Western Resources
under the  Series  B Trust  Agreement  to  pay certain  obligations,  costs  and
expenses  of  the Series  B  Issuer (the  "Series  B Expense  Agreement"), taken
together, are  a  full  and  unconditional guarantee  by  Western  Resources  of
payments  due on the  Series B Preferred  Securities. See "Certain  Terms of the
Series B Guarantee" and "Certain Terms of the Series B Debentures."
 
                    CERTAIN TERMS OF THE SERIES B GUARANTEE
 
GENERAL
 
    The following  summary Description  of  the Series  B Guarantee  sets  forth
certain  portions of the description of the terms and provisions of the Series B
Guarantee  included   in  the   accompanying  Prospectus   under  the   heading,
"Description of the Guarantees," to which reference is hereby made. This summary
of certain terms and provisions of the Series B Guarantee does not purport to be
complete  and is subject to, and qualified  in its entirety by reference to, the
Series B Guarantee. The form of Series B Guarantee has been filed as an  exhibit
to  the  Registration  Statement of  which  this Prospectus  Supplement  and the
accompanying Prospectus are a part.
 
    Western Resources will guarantee, on  a subordinated basis, the  obligations
of  the  Series B  Issuer with  respect  to the  Series B  Preferred Securities;
provided that  the  Series  B  Guarantee  will  not  apply  to  any  payment  of
distributions  if and to the extent that the Series B Issuer does not have funds
sufficient to make such  payments. If Western Resources  does not make  interest
payments  on the Series B Debentures held by the Series B Issuer, it is expected
that the Series B Issuer  will not pay distributions  on the Series B  Preferred
Securities.  The Series B Guarantee will rank subordinate and junior in right of
 
                                      S-13
<PAGE>
payment to all  liabilities of Western  Resources (except trade  credit and  any
liabilities  that may  be made pari  passu with  or subordinate to  the Series B
Guarantee expressly  by their  terms).  See "Description  of the  Guarantees  --
Status of the Guarantees" in the accompanying Prospectus.
 
EVENTS OF DEFAULT
 
    An event of default under the Series B Guarantee will occur upon the failure
of Western Resources to perform any of its payment obligations thereunder.
 
    If the Guarantee Trustee fails to enforce the Series B Guarantee, any holder
of  Series  B Preferred  Securities may  institute  a legal  proceeding directly
against Western Resources  to enforce such  holder's rights under  the Series  B
Guarantee  without first  instituting a  legal proceeding  against the  Series B
Issuer, the  Guarantee Trustee  or any  other  person or  entity. The  Series  B
Guarantee is a guarantee of payment, not of collection.
 
TERMINATION OF THE SERIES B GUARANTEE
 
    The  Series B Guarantee will terminate and be of no further force and effect
upon full payment of the Redemption Price of all Series B Preferred  Securities,
the  distribution  of  Series B  Debentures  to  holders of  Series  B Preferred
Securities in exchange  for all  of the Series  B Preferred  Securities or  upon
payment in full of the amounts payable upon liquidation of the Series B Issuer.
 
                    CERTAIN TERMS OF THE SERIES B DEBENTURES
 
GENERAL
 
    The  following summary  Description of  the Series  B Debentures  sets forth
certain portions  of  the  description  of  the  terms  and  provisions  of  the
Debentures   included  in   the  accompanying  Prospectus   under  the  heading,
"Description of the Debentures," to which reference is hereby made. This summary
of certain terms and provisions of the  Series B Debentures does not purport  to
be  complete and is subject  to, and qualified in  its entirety by reference to,
the Indenture,  including the  Series  B Supplemental  Indenture. The  forms  of
Indenture  and  Supplemental  Indenture  have  been  filed  as  exhibits  to the
Registration Statement of which this Prospectus Supplement and the  accompanying
Prospectus are a part.
 
    Concurrently  with the  issuance of the  Series B  Preferred Securities, the
Series B Issuer  will invest the  proceeds thereof, together  with the Series  B
Common Securities, in the Series B Debentures issued by Western Resources to the
Series  B Issuer. The Series B Debentures  will bear interest at the annual rate
of     %, payable quarterly in arrears, except in the event of an extension,  on
March  31,  June  30, September  30  and  December 31  of  each  year commencing
            , 1996. Interest  which is  accrued and unpaid  after the  quarterly
payment  date therefor will  bear additional interest on  the amount thereof (to
the extent permitted by law) at the rate specified for the Series B  Debentures.
The  term "Interest" as  used herein shall  include quarterly interest payments,
interest on quarterly interest payments  in arrears and Additional Interest  (as
defined below), as applicable.
 
    The  Series B Debentures will be issued under the Indenture and the Series B
Supplemental Indenture. The Series B Debentures will mature on          ,  2036.
The  Series  B  Debentures  will  be  unsecured  and  will  rank  junior  and be
subordinate in right of payment to all Senior Indebtedness of Western Resources.
See "Description  of  the  Debentures  --  Subordination"  in  the  accompanying
Prospectus.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
    Western  Resources has the right at any time  and from time to time, so long
as an Event of Default under the  Indenture has not occurred and is  continuing,
to  extend the Interest payment period for the  Series B Debentures for up to 20
consecutive quarters; provided that no Extension Period shall extend beyond  the
stated  maturity date or date  of redemption of the  Series B Debentures. At the
end of the Extension Period, Western Resources is obligated to pay all  interest
then  accrued and unpaid (together with interest thereon to the extent permitted
by law). During any Extension Period, Western Resources will not declare or  pay
any dividends or distributions (other than dividends or distributions payable in
common stock of Western Resources or other securities ranking junior in right of
payment to the Series B
 
                                      S-14
<PAGE>
Debentures) on, or redeem, purchase, acquire, or make a liquidation payment with
respect  to, any of its capital stock or any security ranking pari passu with or
junior in right of  payment to the  Series B Debentures,  or make any  guarantee
payment  with respect to the  foregoing (other than pro  rata payments under the
Guarantees) or repurchase, or cause any  of its subsidiaries to repurchase,  any
security  of Western  Resources ranking  pari passu with  or junior  in right of
payment to the Series B  Debentures (except for payments  made on any series  of
Debentures  upon the stated maturity of  such Debentures); provided that Western
Resources may  redeem, purchase,  acquire  or make  a liquidation  payment  with
respect  to any of its capital stock or  any security ranking pari passu with or
junior in  right of  payment to  the  Series B  Debentures, make  any  guarantee
payment  with  respect to  the  foregoing or  repurchase,  or cause  any  of its
subsidiaries to repurchase, any security of Western Resources ranking pari passu
with or junior in right  of payment to the  Series B Debentures with  securities
(or  the proceeds from the issuance of securities) having no higher ranking than
the capital stock or the other  securities which are to be redeemed,  purchased,
acquired,  with respect to which a liquidation payment is to be made, to which a
guarantee payment is to be made with respect to the foregoing or which are to be
repurchased. This  covenant requires  that  an interest  payment period  on  one
series of Debentures may be extended only if the interest payment periods on all
series  of Debentures  are likewise  extended. Prior  to the  termination of any
Extension Period,  Western Resources  may further  extend the  interest  payment
period, provided that such Extension Period, together with all such previous and
further  extensions thereof,  may not exceed  20 consecutive  quarters or extend
beyond the maturity  or redemption  date of the  Series B  Debentures. Upon  the
termination  of any Extension  Period and the  payment of all  amounts then due,
Western Resources  may  select a  new  Extension  Period subject  to  the  above
requirements.
 
    So  long as the  Property Trustee shall be  the sole holder  of the Series B
Debentures, Western Resources is required to  give the Property Trustee and  the
Debenture  Trustee notice of its selection of such Extension Period at least one
Business Day prior  to the  date the Property  Trustee or  Western Resources  is
required  to give notice to any national securities exchange on which any of the
Series B Preferred  Securities are  listed or  other applicable  self-regulatory
organization  or to holders of  the Series B Preferred  Securities on the record
date, but in any event not less than one Business Day prior to such record date.
The Debenture Trustee  will be  required to  give notice  of Western  Resources'
selection  of such  Extension Period  to the holders  of the  Series B Preferred
Securities and the Administrative Trustees.
 
ADDITIONAL INTEREST
 
    If  at  any  time  the  Series  B  Issuer  is  required  to  pay  additional
distributions  on distributions in arrears in  respect of the Series B Preferred
Securities, Western Resources will pay to the  Series B Issuer as the holder  of
the  Series B Debentures an amount  of additional interest ("Additional Interest
Attributable  to   Deferral")  equal   to  such   additional  distributions   on
distributions  in arrears. Accordingly, in  such circumstances Western Resources
will, to the extent permitted by  applicable law, pay interest upon interest  in
order  to  provide for  quarterly  compounding on  the  Series B  Debentures. In
addition, if the Series B Issuer  is required to pay taxes, duties,  assessments
or  governmental  charges  of  whatever nature  (other  than  withholding taxes)
imposed by the United States or any  other taxing authority, then, in any  case,
Western  Resources will also pay  such amounts as shall  be required so that the
net amounts  received and  retained by  the Series  B Issuer  after paying  such
taxes,  duties, assessments  or governmental charges  will be not  less than the
amounts the  Series B  Issuer would  have received  had no  such taxes,  duties,
assessments   or  governmental   charges  been   imposed  ("Additional  Interest
Attributable to Taxes"  and, together with  Additional Interest Attributable  to
Deferral, "Additional Interest").
 
REDEMPTION
 
    The  Series B Debentures are  redeemable prior to maturity  at the option of
Western Resources (i) at any time on or after the date set forth on page S-2  of
this  Prospectus Supplement, in  whole or in  part, and (ii)  if a Special Event
occurs and  is  continuing, in  whole,  but  not in  part,  in each  case  at  a
Redemption  Price equal  to 100%  of the  principal amount  thereof plus accrued
interest to the  Redemption Date.  The Series B  Debentures will  be subject  to
optional  redemption  in  whole,  but  not in  part,  upon  the  termination and
liquidation of the  Series B Issuer  pursuant to an  order for the  dissolution,
termination or liquidation of
 
                                      S-15
<PAGE>
the Series B Issuer entered by a court of competent jurisdiction. For so long as
the  Series B Trust  is the holder  of all Series  B Debentures outstanding, the
proceeds of any redemption described in this section shall be used by the Series
B Issuer to redeem  the Series B  Preferred Securities and  the Series B  Common
Securities in accordance with their terms.
 
    Western  Resources shall not  redeem the Series B  Debentures in part unless
all accrued and  unpaid interest  (including any Additional  Interest) has  been
paid  in full on all Series B  Debentures outstanding for all quarterly interest
periods on or prior to the Redemption Date.
 
DISTRIBUTIONS OF SERIES B DEBENTURES
 
    Under certain  circumstances  involving  the termination  of  the  Series  B
Issuer,  Series B Debentures may  be distributed to the  holders of the Series B
Preferred Securities in liquidation of  the Series B Issuer, after  satisfaction
of all liabilities to creditors of the Series B Issuer as provided by applicable
law.  If distributed to holders of Series B Preferred Securities in liquidation,
the Series B  Debentures will initially  be issued in  the form of  one or  more
global  securities,  and  DTC, or  any  successor  depositary for  the  Series B
Preferred Securities, will act as depositary for the Series B Debentures. It  is
anticipated  that the  depositary arrangements for  the Series  B Debentures, if
distributed, would be substantially identical to those in effect for the  Series
B  Preferred Securities. Neither  Western Resources, the  Debenture Trustee, any
Paying Agent nor any other agent  of Western Resources or the Debenture  Trustee
will have any responsibility or liability for any aspect of the records relating
to  or payments made  on account of  persons holding Series  B Debentures in the
form of  a global  security for  the  Series B  Debentures or  for  maintaining,
supervising or reviewing any records relating to such holders.
 
    A  global security shall be exchangeable  for Series B Debentures registered
in the names of persons other than DTC  or its nominee only if (i) DTC  notifies
Western Resources that it is unwilling or unable to continue as a depositary for
such  global security and no successor  depositary shall have been appointed, or
if at  any  time  DTC ceases  to  be  a clearing  agency  registered  under  the
Securities  Exchange Act of 1934, as amended, at  a time when DTC is required to
be so registered to act as such  depositary, (ii) Western Resources in its  sole
discretion  determines that  such global security  shall be  so exchangeable, or
(iii) there  shall have  occurred and  be continuing  an Event  of Default  with
respect  to  such  global security.  Any  global security  that  is exchangeable
pursuant  to  the  preceding  sentence  shall  be  exchangeable  for  definitive
certificates  registered in such names as DTC  shall direct. It is expected that
such instructions  will  be based  upon  directions  received by  DTC  from  its
Participants  (as defined  in the accompanying  Prospectus) with  respect to the
ownership of beneficial  interests in such  global security. In  the event  that
Series B Debentures are issued in definitive form, such Series B Debentures will
be  issued in  denominations of  $25 and integral  multiples thereof  and may be
transferred or exchanged at the offices described below.
 
    Payments on Series  B Debentures represented  by a global  security will  be
made  to DTC, as the depositary for the Series B Debentures. In the event Series
B Debentures  are issued  in definitive  form, principal  and interest  will  be
payable, the transfer of the Series B Debentures will be registrable, and Series
B Debentures will be exchangeable for Series B Debentures of other denominations
of  a like aggregate principal amount, at  the corporate office of the Debenture
Trustee in Wilmington,  Delaware, or at  the offices of  any paying or  transfer
agent  appointed by Western Resources, provided  that payment of interest may be
made, at the option of Western Resources, by check mailed to the address of  the
persons  entitled thereto  or by  wire transfer.  In addition,  if the  Series B
Debentures are issued  in certificated  form, the  record dates  for payment  of
interest  will  be  the  15th day  preceding  the  end of  each  quarter.  For a
description of DTC  and the  terms of  the depositary  arrangements relating  to
payments,  transfers, voting rights  and other matters,  see "Description of the
Preferred  Securities  --  Book-Entry-Only  Issuance  --  The  Depository  Trust
Company" in the accompanying Prospectus.
 
    If  the  Series B  Debentures are  distributed  to the  holders of  Series B
Preferred Securities  upon  the liquidation  of  the Series  B  Issuer,  Western
Resources  will use  its best efforts  to list  the Series B  Debentures on such
stock exchanges, if any, as the Series B Preferred Securities are then listed.
 
                                      S-16
<PAGE>
                             UNITED STATES TAXATION
 
GENERAL
 
    The following  is a  summary of  certain United  States Federal  income  tax
considerations  that  may  be relevant  to  prospective purchasers  of  Series B
Preferred Securities  and represents  the opinion  of Cahill  Gordon &  Reindel,
counsel  to Western Resources, insofar as it relates to matters of law and legal
conclusions. This  section is  based  upon current  provisions of  the  Internal
Revenue Code of 1986, as amended (the "Code"), existing and proposed regulations
thereunder  and current administrative rulings and court decisions, all of which
are subject  to  change.  Subsequent  changes  may  cause  tax  consequences  to
investors  to vary substantially  from the consequences  described below. Unless
otherwise stated, this  summary deals  only with Series  B Preferred  Securities
held  as capital assets and not with special classes of holders, such as dealers
in securities or currencies, life insurance companies, persons holding Series  B
Preferred  Securities as  a hedge against  or which are  hedged against currency
risks or as a part  of a straddle, or persons  whose functional currency is  not
the United States dollar.
 
    POTENTIAL  INVESTORS ARE  ADVISED TO  CONSULT THEIR  TAX ADVISORS  AS TO THE
UNITED STATES FEDERAL  INCOME TAX  CONSEQUENCES OF THE  PURCHASE, OWNERSHIP  AND
DISPOSITION  OF  SERIES  B PREFERRED  SECURITIES  IN LIGHT  OF  THEIR PARTICULAR
CIRCUMSTANCES, AS WELL AS THE EFFECT OF ANY STATE, LOCAL OR OTHER TAX LAWS.
 
    While Western Resources believes, based upon the advice of its counsel, that
the Series  B Debentures  will  be treated  as  indebtedness for  United  States
Federal  income tax  purposes, holders of  Series B  Preferred Securities should
note that the  Internal Revenue  Service (the "IRS")  may attempt  to treat  the
Series  B Debentures as equity rather than indebtedness for tax purposes. If the
IRS were successful in such attempt, the Series B Debentures would be subject to
redemption at the option of Western Resources as described under "Certain  Terms
of   the  Series  B   Preferred  Securities  --   Special  Event  Redemption  or
Distribution." The Series B  Debentures would also be  subject to redemption  at
the  option of  Western Resources  if the tax  law changed,  as a  result of the
Proposed Legislation or  otherwise, so  that in Western  Resources' judgment  it
would  be  precluded from  deducting interest  on the  Series B  Debentures. See
"Western Resources,  Inc. --  Recent  Developments" and  "Certain Terms  of  the
Series B Preferred Securities -- Special Event Redemption or Distribution."
 
INCOME FROM SERIES B PREFERRED SECURITIES
 
    In connection with the issuance of the Series B Preferred Securities, Cahill
Gordon & Reindel will render its opinion generally to the effect that under then
current  law, and assuming full compliance with  the terms of the Series B Trust
Agreement and the Indenture (and certain  other documents), the Series B  Issuer
will  be classified for United  States Federal income tax  purposes as a grantor
trust and not as an association taxable as a corporation.
 
    As a  consequence, each  holder of  Series B  Preferred Securities  will  be
considered  the owner of a  pro rata portion of the  Series B Debentures held by
the Series B Issuer. As a further consequence, each holder of Series B Preferred
Securities will be required to include in gross income his or her pro rata share
of the income accrued on  the Series B Debentures held  by the Series B  Issuer.
Such  income should not exceed distributions received by the holders of Series B
Preferred Securities on the Series B Preferred Securities except in the case  of
an extension of the interest payment period as described under "Certain Terms of
the  Series B Preferred Securities --  Distributions." No portion of such income
will be eligible for the dividends-received deduction.
 
POTENTIAL EXTENSION OF INTEREST PAYMENT PERIOD AND ORIGINAL ISSUE DISCOUNT
 
    Under the Indenture, Western Resources has the option to extend from time to
time the interest  payment period on  the Series  B Debentures to  a period  not
exceeding 20 consecutive quarters but not beyond the maturity date or redemption
date  of  the  Series B  Debentures.  Western  Resources' option  to  extend the
interest payment  period  (even  if  not exercised)  will  cause  the  Series  B
Debentures,  from the date of  issuance, to be treated  as issued with "original
issue discount" for United  States Federal income  tax purposes. Accordingly,  a
holder  of  Series B  Preferred Securities  will  accrue interest  income (i.e.,
 
                                      S-17
<PAGE>
original issue  discount) under  a constant  yield basis  over the  term of  the
Series  B Debentures (including any Extension Period), regardless of the receipt
of cash with respect to the period to which such income is attributable.
 
    Holders of Series  B Preferred  Securities during an  Extension Period  will
include  interest in  gross income in  advance of  the receipt of  cash, and any
holders of  Series B  Preferred Securities  who dispose  of Series  B  Preferred
Securities  prior  to the  record  date for  the  payment of  distributions will
include such interest  in gross income,  but will not  receive any cash  related
thereto from the Series B Issuer. The tax basis of a Series B Preferred Security
will  be increased by the amount of any original issue discount that is included
in income without the receipt  of cash, and will be  decreased when and if  such
cash is subsequently received by the holder of the Series B Preferred Security.
 
DISPOSITION OF SERIES B PREFERRED SECURITIES
 
    Gain  or loss will be recognized on a sale, including a redemption for cash,
of Series B Preferred  Securities in an amount  equal to the difference  between
the  amount realized  and the tax  basis of a  holder of the  Series B Preferred
Securities in his or her Series B Preferred Securities. Gain or loss  recognized
by a holder of Series B Preferred Securities on the sale or exchange of Series B
Preferred  Securities held for more  than one year generally  will be taxable as
long-term capital gain or loss.
 
UNITED STATES ALIEN HOLDERS
 
    For purposes  of this  discussion, a  "United States  Alien Holder"  is  any
holder or beneficial owner who or which is (i) a nonresident alien individual or
(ii)  a  foreign corporation,  foreign  partnership, foreign  estate  or foreign
trust, in any such case not subject to United States Federal income tax on a net
income basis in respect of the Series B Preferred Securities.
 
    Under  present  United  States  Federal  income  tax  law,  subject  to  the
discussion below with respect to backup withholding:
 
        (i)   Payments by the Series B Issuer or any of its Paying Agents to any
    United States Alien Holder will not be subject to United States  withholding
    tax  provided  that  (a) the  beneficial  owner  of the  Series  B Preferred
    Securities does not actually or constructively own 10% or more of the  total
    combined  voting power of all classes of stock of Western Resources, (b) the
    beneficial owner of the Series B  Preferred Securities is not a  "controlled
    foreign  corporation"  for United  States tax  purposes  that is  related to
    Western Resources through stock ownership, and (c) either (1) the beneficial
    owner of the Series B Preferred Securities certifies to the Series B  Issuer
    or  its agent, under penalties of perjury,  that it is a United States Alien
    Holder and provides its name and address  or (2) the holder of the Series  B
    Preferred  Securities is a  securities clearing organization,  bank or other
    financial institution  that  holds  customers' securities  in  the  ordinary
    course  of  its  trade or  business  (a "financial  institution"),  and such
    statement has  been received  from the  beneficial owner  by such  financial
    institution  or by a  financial institution intermediary  between it and the
    beneficial owner,  and such  financial institution  furnishes the  Series  B
    Issuer with a copy thereof; and
 
        (ii)  a United States Alien Holder  of the Series B Preferred Securities
    will not be subject  to United States Federal  income or withholding tax  on
    any  gain  realized  on the  sale  or  exchange of  the  Series  B Preferred
    Securities unless (a) such  person is present in  the United States for  183
    days  or more in  the taxable year  of sale and  (b) such person  has a "tax
    home" in the United States or certain other requirements are met.
 
BACKUP WITHHOLDING AND INFORMATION REPORTING
 
    In general, information requirements will apply to payments to  noncorporate
United  States holders  of the proceeds  of the  sale of the  Series B Preferred
Securities within the United States, and  "backup withholding" at a rate of  31%
will  apply to such payments  if the seller fails  to provide a correct taxpayer
identification number.
 
    Payments of the proceeds from  the sale by a  United States Alien Holder  of
Series  B Preferred Securities made  to or through a  foreign office of a broker
will not be subject to information reporting or
 
                                      S-18
<PAGE>
backup withholding, except  that, if  the broker is  a United  States person,  a
"controlled  foreign corporation"  for United States  tax purposes  or a foreign
person 50% or more of whose gross income is effectively connected with a  United
States  trade  or  business  for  a  specified  three-year  period,  information
reporting may apply to such payments. Payments of the proceeds from the sale  of
Series B Preferred Securities to or through the United States office of a broker
is  subject to information reporting and backup withholding unless the holder or
beneficial owner  certifies as  to  its non-United  States status  or  otherwise
establishes an exemption from information reporting and backup withholding.
 
    The  Internal  Revenue Service  has  issued proposed  regulations  which, if
enacted in their current form, would require backup withholding on payments with
respect to the Series B  Debentures that are made  outside the United States  if
the payor has actual knowledge that the recipient is a United States holder. The
proposed  regulations  are  proposed to  be  effective for  payments  made after
December 31, 1997,  and current law  would remain in  effect until then.  United
States  holders should consult with their tax advisors as to compliance with the
new rules so as to avoid possible backup withholding on payments after 1997.
 
RECEIPT OF SERIES B DEBENTURES UPON LIQUIDATION OF THE SERIES B ISSUER
 
    Under certain circumstances as described in  "Certain Terms of the Series  B
Preferred  Securities  --  Special Event  Redemption  or  Distribution," Western
Resources may  cause the  Series B  Issuer to  be terminated  and the  Series  B
Debentures  to be distributed to the holders of Series B Preferred Securities in
liquidation of such  holders' interests in  the Series B  Issuer. Under  current
United  States Federal income tax law and interpretations, if the Series B Trust
is treated  as  a  grantor  trust  at the  time  of  the  distribution,  such  a
distribution should not be treated as a taxable event to holders of the Series B
Preferred  Securities. Such a  tax-free transaction would result  in a holder of
Series B Preferred Securities retaining an  aggregate tax basis in the Series  B
Debentures  equal to such holder's aggregate tax  basis in the holder's pro rata
share of the Series B Debentures  prior to the distribution. A holder's  holding
period  for such  Series B  Debentures would  include the  period for  which the
Series B Preferred Securities were held by such holder.
 
    If the Series B Trust were not treated as a grantor trust at the time of the
distribution, the distribution could be a taxable event to holders of the Series
B Preferred Securities, in which case  the principles discussed above under  "--
Disposition of Series B Preferred Securities" would apply, and the holders would
have a new tax basis and holding period in the Series B Debentures.
 
                                      S-19
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions set forth in the Underwriting Agreement,
Western  Resources and the Series B Issuer  have agreed that the Series B Issuer
will  sell  to  each  of   the  underwriters  named  below  (collectively,   the
"Underwriters"),  and each of  such Underwriters for whom  Goldman, Sachs & Co.,
Smith Barney Inc., Bear, Stearns & Co. Inc., Dillon, Read & Co. Inc., Prudential
Securities  Incorporated   and   EVEREN   Securities,   Inc.   are   acting   as
representatives  (the "Representatives"), has severally  agreed to purchase, the
respective number of Series B Preferred  Securities set forth opposite its  name
below:
 
<TABLE>
<CAPTION>
                                                                                       NUMBER OF
                                                                                        SERIES B
                                                                                       PREFERRED
                                    UNDERWRITER                                        SECURITIES
- -----------------------------------------------------------------------------------  --------------
<S>                                                                                  <C>
Goldman, Sachs & Co................................................................
Smith Barney Inc...................................................................
Bear, Stearns & Co. Inc............................................................
Dillon, Read & Co. Inc.............................................................
Prudential Securities Incorporated.................................................
EVEREN Securities, Inc.............................................................
 
                                                                                     --------------
    Total..........................................................................       4,800,000
                                                                                     --------------
                                                                                     --------------
</TABLE>
 
    Subject  to  the terms  and conditions  of  the Underwriting  Agreement, the
Underwriters are  committed to  take and  pay  for all  the Series  B  Preferred
Securities offered hereby, if any are taken.
 
    The  Underwriters propose to offer the Series B Preferred Securities in part
directly to the public  at the initial  public offering price  set forth on  the
cover  page  of this  Prospectus Supplement  and in  part to  certain securities
dealers at such price less a concession of  $   per Series B Preferred  Security
($
per  Series  B Preferred  Security  in the  case  of certain  institutions). The
Underwriters may allow, and such dealers may reallow, a concession not in excess
of $   per Series B Preferred Security to certain brokers and dealers. After the
Series B Preferred Securities are released for sale to the public, the  offering
price  and  other  selling  terms  may  from  time  to  time  be  varied  by the
Representatives.
 
    In view  of the  fact  that the  proceeds  from the  sale  of the  Series  B
Preferred  Securities  (together with  the delivery  by the  Series B  Issuer to
Western Resources of the  Series B Common Securities)  will be used to  purchase
the  Series B Debentures issued by Western Resources, the Underwriting Agreement
provides that Western Resources will  pay as Underwriters' compensation for  the
Underwriters  arranging the  investment therein of  such proceeds,  an amount of
$    per  Series B Preferred Security  (or $    per Series B Preferred  Security
sold to certain institutions) for the accounts of the several Underwriters.
 
    Western  Resources and  the Series B  Issuer have agreed,  during the period
beginning from the  date of  the Underwriting  Agreement and  continuing to  and
including  the earlier of (i) the date on which the distribution of the Series B
Preferred Securities ceases, as determined by the Underwriters, or (ii) 30  days
after  the issuance of  the Series B  Preferred Securities, not  to offer, sell,
contract to sell or otherwise dispose of any securities, any other interests  of
the  Series  B Issuer  or any  preferred  securities or  interests of  any other
issuer, as the  case may  be, that  are substantially  similar to  the Series  B
Preferred Securities
 
                                      S-20
<PAGE>
(including  any guarantee  of such  securities or  interests) or  any securities
convertible into or exchangeable  for, or that represent  the right to  receive,
any such securities or other interests, without the prior written consent of the
Representatives.
 
    Prior  to this offering, there has been no market for the Series B Preferred
Securities. The Series B Preferred Securities have been approved for listing  on
the New York Stock Exchange, subject to notice of issuance, under the symbol "WR
PrB."  In  order  to meet  one  of the  requirements  for listing  the  Series B
Preferred Securities  on the  New  York Stock  Exchange, the  Underwriters  have
undertaken  to  sell lots  of 100  or more  Series B  Preferred Securities  to a
minimum of 400 beneficial holders. Trading of the Series B Preferred  Securities
on  the New  York Stock  Exchange is  expected to  commence within  a thirty-day
period after the  initial delivery  of the  Series B  Preferred Securities.  The
Representatives have advised Western Resources that they intend to make a market
in the Series B Preferred Securities prior to the commencement of trading on the
New  York Stock Exchange, but are not obligated to do so and may discontinue any
such market-making at any time without notice.  No assurance can be given as  to
the liquidity of the trading market for the Series B Preferred Securities.
 
    Western  Resources  and the  Series B  Issuer have  agreed to  indemnify the
several Underwriters against  certain liabilities,  including liabilities  under
the Securities Act of 1933.
 
    Certain  of the Underwriters  engage in transactions with,  and from time to
time have performed services  for, Western Resources in  the ordinary course  of
business.
 
                                      S-21
<PAGE>
         [LOGO]
 
                          WESTERN RESOURCES CAPITAL I
                          WESTERN RESOURCES CAPITAL II
 
                CUMULATIVE QUARTERLY INCOME PREFERRED SECURITIES
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
                GUARANTEED TO THE EXTENT THAT EACH SUCH ISSUER,
                 RESPECTIVELY, HAS FUNDS AS SET FORTH HEREIN BY
                            WESTERN RESOURCES, INC.
                                   ---------
 
    Western  Resources  Capital  I  and Western  Resources  Capital  II,  each a
statutory business trust formed under the  laws of the State of Delaware  (each,
an  "Issuer" and, collectively, the "Issuers") may severally offer, from time to
time, their  respective cumulative  quarterly income  preferred securities  (the
"Preferred Securities") representing preferred undivided beneficial interests in
the  assets  of  each  Issuer. Western  Resources,  Inc.,  a  Kansas corporation
("Western Resources"),  will  be the  sole  owner of  the  beneficial  interests
represented  by  common securities  (the  "Common Securities")  of  each Issuer.
Wilmington Trust Company is the Property Trustee of each Issuer. The payment  of
periodic  cash  distributions ("Distributions")  with  respect to  the Preferred
Securities and  payments  on liquidation  or  redemption with  respect  to  such
Preferred  Securities are  each guaranteed by  Western Resources in  the case of
each Issuer (a "Guarantee"), in each case only out of funds held by such Issuer.
The obligations of Western  Resources under each  Guarantee will be  subordinate
and  junior in right of  payment to all liabilities  of Western Resources except
trade credit and any liabilities that may be made pari passu with or subordinate
to the Guarantees expressly by their terms ("Senior Indebtedness"). Concurrently
with the issuance  by an Issuer  of its Preferred  Securities, such Issuer  will
invest   the  proceeds   thereof  in  Western   Resources'  deferrable  interest
subordinated debentures (the  "Debentures") having terms  corresponding to  such
Issuer's  Preferred Securities. The Debentures will be unsecured and subordinate
and junior in right of payment to the Senior Indebtedness of Western  Resources.
The  Debentures held by each Issuer will be its sole asset, and the interest and
payments of principal  on such Debentures  will be its  only revenues. Upon  the
occurrence of certain events, Western Resources may redeem the Debentures or may
terminate  either  Issuer and  cause  the Debentures  to  be distributed  to the
holders of the corresponding Preferred Securities in liquidation of the interest
in such Issuer represented by such Preferred Securities. See "Description of the
Preferred Securities -- Liquidation Distribution Upon Dissolution."
 
    The Preferred Securities may be offered  in amounts, at prices and on  terms
to  be determined at the time of offering, provided, however, that the aggregate
initial public offering  price of  all Preferred Securities  issued pursuant  to
this  Prospectus shall not  exceed $220,000,000. Certain  specific terms of each
Issuer's Preferred  Securities in  respect  of which  this Prospectus  is  being
delivered will be set forth in an accompanying Prospectus Supplement, including,
where  applicable and to  the extent not  set forth herein,  the identity of the
Issuer, the specific title, the aggregate amount, the distribution rate (or  the
method for determining such rate), the stated liquidation preference, redemption
provisions,  other  rights,  the initial  public  offering price  and  any other
special terms, as well as any planned listing on a securities exchange, of  such
Preferred Securities.
 
    The  Preferred Securities  may be  sold in a  public offering  to or through
underwriters  or  dealers   designated  from   time  to  time.   See  "Plan   of
Distribution."  The names of any of the  underwriters or dealers involved in the
sale of the Preferred  Securities in respect of  which this Prospectus is  being
delivered,  the  number of  Preferred  Securities to  be  purchased by  any such
underwriters or dealers,  any applicable  commissions or discounts  and the  net
proceeds  to  each  Issuer  will  be  set  forth  in  the  applicable Prospectus
Supplement.
 
    Each Prospectus Supplement will also contain information concerning  certain
United  States  Federal income  tax considerations  applicable to  the Preferred
Securities offered thereby.
 
                                 --------------
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
 EXCHANGE   COMMISSION  OR  ANY   STATE  SECURITIES  COMMISSION   NOR  HAS  THE
   SECURITIES   AND   EXCHANGE   COMMISSION    OR   ANY   STATE    SECURITIES
     COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY  OF THIS PROSPECTUS.
              ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                                 --------------
 
       The date of this Prospectus is December 1, 1995, as supplemented.
<PAGE>
                             AVAILABLE INFORMATION
 
    Western Resources  is  subject  to the  informational  requirements  of  the
Securities  Exchange  Act  of 1934,  as  amended  (the "Exchange  Act"),  and in
accordance therewith files reports, proxy statements and other information  with
the  Securities  and  Exchange  Commission  (the  "Commission").  Reports, proxy
statements and other information filed by Western Resources may be inspected and
copied at the public reference facilities  maintained by the Commission in  Room
1024,  450 Fifth Street,  N.W., Washington, D.C. 20549,  and at the Commission's
Regional Offices located at 7 World Trade Center, Suite 1300, New York, New York
10048 and  Citicorp  Center,  500  West Madison  Street,  Suite  1400,  Chicago,
Illinois  60661-2511.  Copies of  such materials  may  be obtained  upon written
request from the Public Reference Section of the Commission at 450 Fifth Street,
N.W.,  Washington,  D.C.  20549,  at  prescribed  rates.  In  addition,  Western
Resources  is required to  file electronic versions of  these documents with the
Commission through  the Commission's  Electronic Data  Gathering, Analysis,  and
Retrieval  (EDGAR) system.  The Commission  maintains a  World Wide  Web site at
http://www.sec.gov that contains reports,  proxy and information statements  and
other  information  regarding  registrants  that  file  electronically  with the
Commission. In addition, such material may  also be inspected and copied at  the
offices of the New York Stock Exchange, Inc. (the "New York Stock Exchange"), 20
Broad  Street, New York, New York 10005,  on which certain of Western Resources'
securities are listed.
 
    Western  Resources  and  the  Issuers  have  filed  with  the  Commission  a
registration  statement on  Form S-3  (herein together  with all  amendments and
exhibits thereto,  referred  to  as  the  "Registration  Statement")  under  the
Securities  Act of 1933, as amended (the "Securities Act"). This Prospectus does
not contain all  of the  information set  forth in  the Registration  Statement,
certain  parts of which are omitted in accordance with the rules and regulations
of the Commission.  For further  information, reference  is hereby  made to  the
Registration Statement.
 
    No separate financial statements of the Issuers are included herein. Western
Resources  considers that  such financial  statements would  not be  material to
holders of the Preferred Securities because: (i) all of the Common Securities of
the Issuers  are owned  by  Western Resources,  a  reporting company  under  the
Exchange Act; (ii) the Issuers have no independent operations, but exist for the
sole  purpose of  issuing the  Preferred Securities  and investing  the proceeds
thereof  (plus  the  Common  Securities)  in  the  Debentures;  and  (iii)   the
obligations  of the Issuers under the  Preferred Securities, to the extent funds
are available therefor, are fully  and unconditionally guaranteed to the  extent
set forth herein by Western Resources.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The  following  documents filed  with  the Commission  by  Western Resources
pursuant to the Exchange Act, are incorporated herein by reference:
 
    1.  Western Resources'  Annual  Report  on  Form 10-K  for  the  year  ended
        December  31, 1994. Such report includes  the Annual Report on Form 10-K
        for Kansas Gas and Electric Company ("KG&E") for the year ended December
        31, 1994.
 
    2.  Western Resources' Quarterly Report on  Form 10-Q for the quarter  ended
        March 31, 1995.
 
    3.  Western  Resources' Quarterly Report on Form  10-Q for the quarter ended
        June 30, 1995.
 
    4.  Western Resources' Quarterly Report on  Form 10-Q for the quarter  ended
        September 30, 1995.
 
    5.  Western  Resources' Current Reports  on Form 8-K  dated January 31, 1995
        and August 18, 1995.
 
    6.  KG&E's Current Report on Form 8-K dated August 18, 1995.
 
    All other documents filed by  Western Resources pursuant to Sections  13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus
and prior to the termination of this offering shall be deemed to be incorporated
by  reference in  this Prospectus and  to be  a part hereof  from the respective
dates of the filing of such documents. Western Resources expressly excludes from
such
 
                                       2
<PAGE>
incorporation the Report of the Compensation Committee and the Performance Graph
contained in any proxy statement filed by Western Resources pursuant to  Section
14  of the Exchange Act  subsequent to the date of  this Prospectus and prior to
the termination of the offering of the Preferred Securities hereby.
 
    Any statement contained herein or in a document all or a portion of which is
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of  this Prospectus to the extent that  a
statement  contained herein  or in any  other subsequently  filed document which
also is  or  is  deemed to  be  incorporated  by reference  herein  modifies  or
supersedes  such statement. Any  such statement so  modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus.
 
    Western Resources will provide  without charge to  each person, including  a
beneficial owner, to whom a copy of this Prospectus has been delivered, upon the
written  or  oral request  of any  such person,  a copy  of any  and all  of the
documents  incorporated  herein  by  reference,  other  than  exhibits  to  such
documents  (unless such exhibits  are specifically incorporated  by reference in
such documents).  Requests  for  such  copies  should  be  directed  to  Western
Resources,  Inc.,  818  Kansas  Avenue, Topeka,  Kansas  66612,  telephone (913)
575-6322, Attention: Richard D. Terrill, Esq., Secretary of Western Resources.
 
                                  THE ISSUERS
 
GENERAL
 
    Each of the Issuers is a statutory business trust formed under Delaware  law
pursuant   to  (i)  a  trust  agreement   executed  by  Western  Resources  (the
"Depositor"), as  the depositor  of each  Issuer, and  the Issuer  Trustees  (as
defined  herein) and (ii) the filing of a certificate of trust with the Delaware
Secretary of State. Each  such trust agreement will  be amended and restated  in
its entirety (as so amended and restated, a "Trust Agreement" and, collectively,
the  "Trust Agreements") substantially  in the form  filed as an  exhibit to the
Registration Statement of which this Prospectus is a part. Each Trust  Agreement
will  be qualified  as an indenture  under the  Trust Indenture Act  of 1939, as
amended (the "Trust Indenture Act"). The Issuers exist for the exclusive purpose
of  (i)  issuing  their  respective   Preferred  Securities  and  their   Common
Securities,  (ii) purchasing the  Debentures with the  Common Securities and the
proceeds from the sale  of the Preferred Securities  and (iii) engaging only  in
those  other  activities  necessary or  incidental  thereto. All  of  the Common
Securities will be owned by Western  Resources. The Common Securities will  rank
pari  passu, and  payments will  be made  thereon pro  rata, with  the Preferred
Securities, except  that upon  the occurrence  and continuance  of an  Event  of
Default  (as defined herein) under a Trust  Agreement, the rights of the holders
of the corresponding Common  Securities to payment  in respect of  distributions
and  payments  upon  liquidation,  redemption  or  other  acquisition  of Common
Securities will  be subordinated  to  the rights  of  the holders  of  Preferred
Securities.  Western Resources will acquire Common  Securities of each Issuer in
an aggregate liquidation amount equal to 3% of the total capital of each Issuer.
Each Issuer has  a term of  approximately 30 to  49 years, as  specified in  the
applicable  Prospectus Supplement, but may terminate  earlier as provided in the
Trust Agreement with respect to such Issuer. Each Issuer's business and  affairs
is  conducted by its trustees, each appointed  by Western Resources as holder of
the Common Securities:  Wilmington Trust  Company (the  "Property Trustee")  and
three  individual trustees (the "Administrative  Trustees") who are employees or
officers of  or affiliated  with Western  Resources (collectively,  the  "Issuer
Trustees").  Western Resources, as the Depositor  of the Issuer, or, the holders
of a  majority  in liquidation  amount  of  the Issuer  Securities  (as  defined
herein), if an Event of Default has occurred and is continuing, will be entitled
to  appoint, remove or replace  the Issuer Trustees. Unless  an Event of Default
shall have occurred  and is  continuing, the  holders of  the Issuer  Securities
shall   not  have  the  right  to  vote   to  appoint,  remove  or  replace  the
Administrative Trustees, which voting rights  are vested exclusively in  Western
Resources  as the Depositor of the Issuer. The duties and obligations of each of
the Issuer  Trustees are  governed by  the applicable  Trust Agreement.  Western
Resources has agreed to pay all fees and expenses related to each Issuer and the
offering  of  the  Preferred  Securities  and has  agreed  to  pay,  directly or
indirectly, all ongoing costs, expenses and liabilities of each Issuer.
 
                                       3
<PAGE>
ACCOUNTING TREATMENT
 
    The Trusts are special purpose entities which are effectively controlled  by
Western  Resources. The financial position, operating  results and cash flows of
these special purpose entities will be consolidated with Western Resources.  The
Debentures  issued by Western Resources to the Trusts and all other intercompany
transactions will  be  eliminated  in consolidation.  The  Preferred  Securities
issued  by  the  Trusts  will  be  reflected  as  a  separate  line  item titled
"Company-obligated Mandatorily Redeemable Preferred Securities of Trusts holding
solely Company Subordinated Debt Securities" in Western Resource's  Consolidated
Statement of Capitalization.
 
                            WESTERN RESOURCES, INC.
 
GENERAL
 
    Western  Resources is a combination electric  and natural gas public utility
engaged in  the  generation, transmission,  distribution  and sale  of  electric
energy  in Kansas  and the  purchase, distribution,  transportation and  sale of
natural gas in Kansas and Oklahoma. The Company was incorporated under the  laws
of  the State of Kansas  in 1924. The Company's  principal executive offices (as
well as  its principal  place of  business) are  located at  818 Kansas  Avenue,
Topeka, Kansas 66612, and its telephone number is (913) 575-6300.
 
OTHER
 
    The  following additional  information is  provided with  respect to certain
contracts discussed under "Item 1. Business" in Western Resources' Annual Report
on Form 10-K for the year ended  December 31, 1994 (the "1994 Form 10-K")  which
is  incorporated  herein  by  reference.  Western  Resources  believes  that its
business is not substantially dependent on such contracts discussed below.  Each
of these contracts is more fully described in the 1994 Form 10-K.
 
    Specifically, Western Resources believes that there are plentiful sources of
coal  available  at  reasonable prices  to  replace,  if necessary,  coal  to be
supplied pursuant to Western  Resources' contracts with  Caballo Rojo, Inc.  and
Carter Mining Company.
 
    Transportation  contracts  with  Southern Pacific  Lines  and  The Atchison,
Topeka and  Santa  Fe  Railway  Company  are related  to  only  two  of  Western
Resources' coal-burning facilities which constitute approximately 15% of Western
Resources' total electric generating capacity.
 
    Western Resources' business is not substantially dependent on its gas supply
contracts with Kansas Gas Supply, with Amoco Production Company ("Amoco") or its
short-term  spot market  agreement to supply  gas for its  Lawrence and Tecumseh
stations. The Kansas Gas  Supply contract is a  fixed rate contract expiring  by
the  end  of  December  1995.  Western  Resources  expects  to  purchase readily
available gas from the spot market to  replace most of this supply. Natural  gas
supplied  through the WNG system under its short-term spot market agreement with
various suppliers fuels gas-burning facilities  that constitute less than 1%  of
Western  Resources'  total  electric  generating  capacity.  The  Amoco contract
supplies Western Resources' distribution systems served from interstate pipeline
systems. Amoco is one of various suppliers of natural gas over the WNG  pipeline
system.  If the  Amoco contract  were cancelled,  Western Resources  believes it
could replace gas supplied  by Amoco with  gas from other  suppliers to the  WNG
system.
 
    In  the event  that Western  Resources were required  to replace  any of the
foregoing supply or transportation contracts, it would not substantially disrupt
Western Resources' business.
 
                    DESCRIPTION OF THE PREFERRED SECURITIES
 
GENERAL
 
    An original trust  agreement between  Western Resources,  as Depositor,  and
Wilmington  Trust Company, as  the Property Trustee, has  been used to authorize
and create each Issuer. The original  trust agreements are filed as exhibits  to
the  Registration Statement  of which this  Prospectus is a  part. The Preferred
Securities and  the Common  Securities  of each  Issuer (together,  the  "Issuer
Securities")  will be  issued by the  Administrative Trustees on  behalf of each
Issuer pursuant to the  terms of each Issuer's  Trust Agreement (as amended  and
restated from the original trust agreement). Each Issuer's Preferred
 
                                       4
<PAGE>
Securities  represent undivided beneficial trust interests in the assets of such
Issuer and  entitle  the  holders  thereof  to  a  preference  over  the  Common
Securities   of  such  Issuer,   in  certain  circumstances,   with  respect  to
distributions and amounts  payable on redemption  or liquidation as  well as  to
other  benefits as  described in the  applicable Trust  Agreement. The following
summary of certain  provisions of the  Trust Agreements does  not purport to  be
complete  and is subject to, and qualified  in its entirety by reference to, the
provisions of  such  Trust Agreements  and  the Trust  Indenture  Act.  Wherever
particular  sections or defined  terms of the Trust  Agreements are referred to,
such sections or  defined terms  are incorporated herein  by reference.  Section
references  used herein  are references  to provisions  of the  Trust Agreements
unless otherwise stated.
 
    All of  the  Common Securities  of  each Issuer  will  be owned  by  Western
Resources.  The Common Securities  of each Issuer rank  pari passu, and payments
will be made thereon pro rata, with the Preferred Securities of each such Issuer
except as  described under  "-- Subordination  of Common  Securities."  (Section
4.03).  Legal title to the  Debentures will be held in  the name of the Property
Trustee and  held  in  trust for  the  benefit  of the  holders  of  the  Issuer
Securities. (Section 2.09). Each Guarantee is a full and unconditional guarantee
on  a subordinated  basis with respect  to the related  Preferred Securities but
does not guarantee payment of distributions or amounts payable on redemption  or
liquidation  of the related  Preferred Securities when the  Issuer does not have
funds sufficient to make such payments.
 
    The Preferred Securities will initially  be offered in denominations of  $25
(based on Liquidation Amount) and integral multiples of $25 in excess thereof.
 
DISTRIBUTIONS
 
    The  distributions payable  on each series  of Preferred  Securities will be
fixed at the rate per annum  set forth in the applicable Prospectus  Supplement.
Distributions  in  arrears  after  the  quarterly  payment  date  therefor  will
accumulate additional distributions thereon at the  same rate per annum, to  the
extent  permitted by law.  The term "distributions" as  used herein includes any
such additional distributions, unless otherwise  stated, and shall also  include
any  Additional  Amounts  (as  defined herein)  with  respect  to  the Preferred
Securities. The amount of distributions payable for any period will be  computed
on  the basis  of a  360-day year of  twelve 30-day  months and,  for any period
shorter than a full month, shall be  computed on the basis of the actual  number
of  days  elapsed in  such period.  (Section 4.01(b)).  See "Description  of the
Debentures -- Additional Interest."
 
    Distributions on the  Preferred Securities will  be cumulative, will  accrue
from  the date of the initial issuance thereof, and will be payable quarterly in
arrears, on March 31, June 30, September 30 and December 31 of each year, except
in the event of an extension of the interest payment period by Western Resources
on the corresponding series of Debentures. In  the event that any date on  which
distributions  are otherwise payable  on Preferred Securities  is not a Business
Day, payment of the distributions payable on such date will be made on the  next
succeeding day that is a Business Day (and without any interest or other payment
in  respect to any such delay) except that,  if such Business Day is in the next
succeeding calendar year,  payment of  such distribution  shall be  made on  the
immediately  preceding Business Day, in each case with the same force and effect
as if made on such date (each date on which distributions are otherwise  payable
in accordance with the foregoing, a "Distribution Date"). A "Business Day" shall
mean  any day other than (x) a Saturday or a Sunday, (y) a day on which banks in
New York are authorized or obligated by law or executive order to remain  closed
or  (z) a day on which the Corporate Trust Office of the Property Trustee or the
principal office of Western Resources is closed for business. (Sections 1.01 and
4.01(a)).
 
    Western Resources has the right  under the Deferrable Interest  Subordinated
Debenture  Indenture  (the  "Indenture"),  as  supplemented  by  a  Supplemental
Indenture relating to a  series of Debentures  (a "Supplemental Indenture"),  to
extend,  from  time to  time,  the interest  payment  period on  each  series of
Debentures issued thereunder for a period not exceeding 20 consecutive quarters,
with the consequence that quarterly distributions on the corresponding Preferred
Securities would  be  deferred  (but  would  continue  to  accrue  distributions
thereon,  including additional distributions payable  on unpaid distributions to
the extent permitted by law  at the rate per annum  set forth in the  applicable
Prospectus  Supplement,  compounded quarterly)  by each  Issuer during  any such
extended interest payment period.
 
                                       5
<PAGE>
In the event Western Resources exercises this right, during such period  Western
Resources  will not  declare or pay  any dividends or  distributions (other than
dividends or distributions payable in common stock of Western Resources or other
securities ranking junior in right of payment to the Debentures) on, or  redeem,
purchase,  acquire, or make  a liquidation payment  with respect to,  any of its
capital stock or  any security ranking  pari passu  with or junior  in right  of
payment  to the Debentures, or  make any guarantee payments  with respect to the
foregoing (other than pro rata payments under the Guarantees) or repurchase,  or
cause  any of its subsidiaries to  repurchase, any security of Western Resources
ranking pari passu with or junior in right of payment to the Debentures  (except
for  payments made on any series of  Debentures upon the stated maturity of such
Debentures); provided that  Western Resources may  redeem, purchase, acquire  or
make  a liquidation  payment with  respect to  any of  its capital  stock or any
security ranking  pari  passu  with  or  junior  in  right  of  payment  to  the
Debentures,  make  any  guarantee  payment  with  respect  to  the  foregoing or
repurchase, or cause  any of  its subsidiaries  to repurchase,  any security  of
Western  Resources ranking pari passu with or  junior in right of payment to the
Debentures with securities  (or the  proceeds from the  issuance of  securities)
having  no higher ranking than  the capital stock or  the other securities which
are to be  redeemed, purchased, acquired,  with respect to  which a  liquidation
payment  is to be made, to which a  guarantee payment is to be made with respect
to the foregoing or which are to be repurchased. This covenant requires that  an
interest  payment period on one series of Debentures may be extended only if the
interest payment periods on all series of Debentures are extended. Prior to  the
termination  of any such extended interest payment period, Western Resources may
further extend the interest payment period, provided that such extended interest
payment period, together with all  previous and further extensions thereof,  may
not  exceed  20  consecutive  quarters  or extend  beyond  the  maturity  or the
redemption  date  of  the  series  of  the  Debentures  in  question.  Upon  the
termination  of  any extended  interest payment  period and  the payment  of all
amounts then due, Western Resources may  select a new extended interest  payment
period subject to the foregoing requirements. See "Description of the Debentures
- --  Interest"  and  "-- Western  Resources'  Option to  Extend  Interest Payment
Periods."
 
    It is anticipated that the income of each Issuer available for  distribution
to the holders of the Preferred Securities of such Issuer will be limited to the
payments  under the  Debentures which the  Issuer will purchase  with the Common
Securities and  the  proceeds  from  the issuance  and  sale  of  the  Preferred
Securities.  See "Description of the Debentures."  If Western Resources does not
make interest payments  on the Debentures,  the Property Trustee  will not  have
funds available to pay distributions on the Preferred Securities. The payment of
distributions  (if and to the extent an Issuer has funds sufficient to make such
payments) is guaranteed  on a  subordinated basis  by Western  Resources to  the
extent set forth herein under "Description of the Guarantees."
 
    Distributions  on the  Preferred Securities will  be payable  to the holders
thereof as they appear on the register of the applicable Issuer on the  relevant
record   dates,  which,   as  long  as   the  Preferred   Securities  remain  in
book-entry-only  form,  will  be  one   Business  Day  prior  to  the   relevant
Distribution  Date.  Subject  to any  applicable  laws and  regulations  and the
provisions of the applicable Trust Agreement, each such payment will be made  as
described  under "-- Book-Entry-Only  Issuance -- The  Depository Trust Company"
below.  In  the  event   that  the  Preferred  Securities   do  not  remain   in
book-entry-only  form, the relevant record date shall  be the date 15 days prior
to the relevant Distribution Date. (Section 4.01(d)).
 
REDEMPTION
 
    Upon the repayment of any series of Debentures, whether at maturity or  upon
earlier  redemption  as  provided  in  the  Indenture,  the  proceeds  from such
repayment shall be applied by the Property  Trustee to redeem a Like Amount  (as
defined  herein) of corresponding  Issuer Securities, upon not  less than 30 nor
more than 90 days' notice, at the Liquidation Amount plus accumulated and unpaid
distributions to the Redemption Date (the "Redemption Price"). See  "Description
of the Debentures -- Optional Redemption."
 
    Western  Resources  will have  the  right to  redeem  the Debentures  of any
particular series (a)  on or  after a  date to  be specified  in the  Prospectus
Supplement with respect to such series of Debentures, in
 
                                       6
<PAGE>
whole  or in part, or (b) at any time, in whole but not in part, upon occurrence
of a Tax Event or an Investment Company Event (each as defined below, a "Special
Event"),  subject  to  the  conditions  described  under  "Description  of   the
Debentures -- Optional Redemption."
 
SPECIAL EVENT REDEMPTION OR DISTRIBUTION
 
    If  a Special Event shall occur and  be continuing with respect to an Issuer
or the Preferred Securities of such  Issuer, Western Resources has the right  to
(i)  redeem the corresponding Debentures in whole,  but not in part, and thereby
cause a mandatory redemption of such  Preferred Securities in whole, but not  in
part,  at the Redemption Price  within 90 days following  the occurrence of such
Special Event,  or  (ii)  terminate  the  Issuer  and  cause  the  corresponding
Debentures  to be distributed, subject  to the receipt of  an Opinion of Counsel
experienced in such  matters to  the effect that  the holders  of the  Preferred
Securities  will not recognize gain or loss for United States Federal income tax
purposes as  a result  of such  distribution, to  the holders  of the  Preferred
Securities  of such  series in  liquidation of  such Issuer.  If at  any time an
Issuer is not or will not be taxed as  a grantor trust, but a Tax Event has  not
occurred,  the Depositor has  the right to  terminate such Issuer  and cause the
corresponding Debentures to be distributed, subject to the receipt of an Opinion
of Counsel experienced in  such matters to  the effect that  the holders of  the
Preferred  Securities will not recognize gain  or loss for United States Federal
income tax purposes  as a result  of such  distribution, to the  holders of  the
Preferred  Securities of such Issuer. Under current United States Federal income
tax law and  interpretations, if the  applicable Trust is  treated as a  grantor
trust  at the  time of  the distribution,  such a  distribution should  not be a
taxable event to holders of the  Preferred Securities. Should there be a  change
in   law,  a  change   in  legal  interpretation,  a   Special  Event  or  other
circumstances, however, the termination could be  a taxable event to holders  of
the Preferred Securities of an Issuer. See "United States Taxation -- Receipt of
Series   A  Debentures  Upon  Liquidation  of  the  Series  A  Issuer,"  in  the
accompanying Prospectus Supplement. If Western  Resources does not elect  either
option (i) or (ii) above, the Preferred Securities will remain outstanding.
 
    "Tax Event" means the receipt by an Issuer or Western Resources, as the case
may  be, of an Opinion  of Counsel (which may be  counsel to the Issuer, Western
Resources or  an affiliate,  and  which must  be  reasonably acceptable  to  the
Property  Trustee) experienced in such matters to the effect that a relevant tax
law change has occurred  after a date specified  in the accompanying  Prospectus
Supplement. For purposes of the preceding sentence, a relevant tax law change is
any  amendment or change to (or officially  proposed amendment or change to) the
laws (including regulations thereunder)  of the United  States or any  political
subdivision  or taxing  authority thereof,  or the  publication of  any judicial
opinion interpreting such laws (and  regulations) or any written  interpretation
of  such laws (or regulations) by any governmental authority having jurisdiction
to enforce  or administer  such laws  (or regulations)  (including official  and
unofficial  opinions  purporting to  apply such  laws  and regulations  to other
persons who have issued securities similar to the Debentures), which  amendment,
change,  proposed amendment or change, opinion or interpretation could, if valid
and enacted or applied  to an Issuer  or Western Resources,  result in (i)  such
Issuer, either currently or within 90 days of the date thereof, becoming subject
to  United States  Federal income  tax with  respect to  interest received  on a
series of Debentures, (ii) interest payable by Western Resources on a series  of
Debentures  attributable to the Preferred Securities, either currently or within
90 days of the  date thereof, becoming nondeductible  for United States  Federal
income  tax purposes or (iii)  an Issuer, either currently  or within 90 days of
the date thereof, becoming  subject to more  than a de  minimis amount of  other
taxes, duties or other governmental charges.
 
    "Investment  Company  Event" means  the  occurrence of  a  change in  law or
regulation or  a change  in the  interpretation  or application  of any  law  or
regulation  by any  legislative body,  court, governmental  agency or regulatory
authority (a "Change in 1940 Act Law") to  the effect that an Issuer is or  will
be  considered an "investment  company" that is required  to be registered under
the Investment Company Act of 1940, as amended (the "1940 Act"), which Change in
1940 Act  Law becomes  effective  after a  date  specified in  the  accompanying
Prospectus Supplement.
 
    "Like  Amount" means (i) with respect  to a redemption of Issuer Securities,
Issuer Securities having an aggregate Liquidation Amount equal to the  principal
amount of corresponding Debentures to be
 
                                       7
<PAGE>
contemporaneously  redeemed in accordance with the Indenture and the proceeds of
which will be used  to pay the  Redemption Price of  such Issuer Securities  and
(ii)  with respect to a distribution of a series of Debentures to holders of the
corresponding  Preferred  Securities  in  connection  with  the  termination  or
liquidation  of  the  applicable  Issuer  upon  the  bankruptcy,  dissolution or
liquidation of a holder of corresponding Common Securities, the occurrence of  a
Special  Event or in the event that the  applicable Issuer is not or will not be
taxed as a grantor trust but a  Tax Event has not occurred, Debentures having  a
principal  amount equal  to the  aggregate Liquidation  Amount of  the Preferred
Securities of the holders to whom such series of Debentures is distributed.
 
REDEMPTION PROCEDURES
 
    Preferred Securities  redeemed  on  each  date  fixed  for  redemption  (the
"Redemption  Date") shall be redeemed at  the Redemption Price with the proceeds
from the contemporaneous redemption of the corresponding Debentures. Redemptions
of Preferred Securities shall be made, and the Redemption Price shall be  deemed
payable,  on each Redemption  Date only to  the extent that  an Issuer has funds
sufficient for the payment of such Redemption Price. (Section 4.02(d)). See  "--
Subordination of Common Securities."
 
    If the Property Trustee gives a notice of redemption in respect of Preferred
Securities  of a  particular series (which  notice will be  conditioned upon the
redemption of the related series of  Debentures), then, by 12:00 noon, New  York
time,  on  the Redemption  Date,  the Property  Trustee  will, so  long  as such
Preferred Securities are in book-entry-only  form, irrevocably deposit with  The
Depository  Trust  Company  ("DTC")  funds  sufficient  to  pay  the  applicable
Redemption Price  and,  at  the  direction  of  the  Depositor,  will  give  DTC
irrevocable  instructions  and  authority to  pay  the Redemption  Price  to the
holders of such Preferred  Securities. See "--  Book-Entry-Only Issuance --  The
Depository  Trust  Company."  If  such Preferred  Securities  are  no  longer in
book-entry-only form, the  Property Trustee  will irrevocably  deposit with  the
Paying  Agent  for  such  Preferred  Securities  funds  sufficient  to  pay  the
applicable  Redemption  Price  and  will  give  such  Paying  Agent  irrevocable
instructions  and authority to  pay the Redemption Price  to the holders thereof
upon  surrender   of  their   certificates  evidencing   Preferred   Securities.
Notwithstanding  the  foregoing,  distributions  payable  on  or  prior  to  the
Redemption Date  for any  Preferred Securities  called for  redemption shall  be
payable  to the holders of such Preferred Securities on the relevant record date
for the related Distribution Date. If notice of redemption shall have been given
and funds deposited as required, then upon the date of such deposit, all  rights
of  holders of  such Preferred Securities  so called for  redemption will cease,
except the right  of the  holders of such  Preferred Securities  to receive  the
Redemption  Price,  but  without interest  on  such Redemption  Price,  and such
Preferred Securities will cease  to be outstanding. In  the event that any  date
fixed for redemption of Preferred Securities is not a Business Day, then payment
of the Redemption Price payable on such date will be made on the next succeeding
day  which  is a  Business Day  (and without  any interest  or other  payment in
respect of any such delay), except that, if such Business Day falls in the  next
calendar  year, such payment will be  made on the immediately preceding Business
Day. In the event that payment of  the Redemption Price in respect of  Preferred
Securities  called for redemption is not paid either by the applicable Issuer or
by Western Resources  pursuant to the  corresponding Guarantee described  herein
under   "Description  of  the  Guarantees,"   distributions  on  such  Preferred
Securities will continue to  accrue at the  rate set forth on  the face of  such
securities,  from the original Redemption Date to  the date of payment, in which
case the actual payment  date will be considered  the date fixed for  redemption
for purposes of calculating the Redemption Price. (Section 4.02(e)).
 
    Subject  to  applicable law  (including,  without limitation,  United States
Federal securities law), Western Resources or  its subsidiaries may at any  time
and  from time to  time purchase outstanding Preferred  Securities by tender, in
the open market or by private agreement.
 
    Payment of the Redemption Price on  Preferred Securities to holders of  such
Preferred  Securities shall be made to the record holders thereof as they appear
on the register for such Preferred Securities
 
                                       8
<PAGE>
on the  relevant record  date, which  shall be  one Business  Day prior  to  the
relevant  Redemption  Date,  provided,  however, that  in  the  event  that such
Preferred Securities do not remain in book-entry-only form, the relevant  record
date shall be the date 15 days prior to the Redemption Date. (Section 4.02(f)).
 
    If  less than all the outstanding Issuer  Securities are to be redeemed on a
Redemption Date, then the aggregate amount payable shall be allocated 3% to  the
Common  Securities and 97% to the Preferred Securities. The particular Preferred
Securities to be redeemed shall be selected  not more than 90 days prior to  the
Redemption   Date  by  the  Property  Trustee  from  the  outstanding  Preferred
Securities of such series not previously  called for redemption, by such  method
as  the Property Trustee shall  deem fair and appropriate  and which may provide
for the  selection  for  redemption  of portions  (equal  to  $25  and  integral
multiples  in excess thereof)  of the aggregate  Liquidation Amount of Preferred
Securities of  a  denomination  larger  than $25.  The  Property  Trustee  shall
promptly  notify the Securities Registrar in writing of the Preferred Securities
selected for  partial  redemption  and,  in  the  case  of  any  such  Preferred
Securities  selected for  partial redemption,  the aggregate  Liquidation Amount
thereof to be  redeemed. For all  purposes of each  Trust Agreement, unless  the
context  otherwise  requires, all  provisions relating  to  the redemption  of a
series of  Preferred Securities  shall  relate, in  the  case of  any  Preferred
Securities  of  such series  redeemed or  to be  redeemed only  in part,  to the
portion of the aggregate Liquidation Amount of the Preferred Securities of  such
series that has been or is to be redeemed. (Section 4.02(g)).
 
SUBORDINATION OF COMMON SECURITIES
 
    Payment  of distributions (including Additional  Amounts, if applicable) on,
and the Redemption Price of, Issuer Securities, as applicable, shall be made pro
rata based on the aggregate Liquidation Amount of both the Preferred  Securities
and  the Common Securities; provided, however,  that if on any Distribution Date
or Redemption Date an  Event of Default  (as defined herein,  see "-- Events  of
Default;  Notice,"  below)  under  the  Indenture  shall  have  occurred  and be
continuing, with respect to a series  of Preferred Securities, no payment of  or
any  distribution  (including  Additional  Amounts, if  applicable)  on,  or the
Redemption Price of,  any Common  Security corresponding thereto,  and no  other
payment  on account of  the redemption, liquidation or  other acquisition of the
corresponding Common Securities shall be made unless payment in full in cash  of
all  accumulated  and  unpaid distributions  (including  Additional  Amounts, if
applicable) on  all outstanding  Preferred  Securities of  such series  for  all
distribution  periods terminating on or prior thereto, or in the case of payment
of the Redemption Price  the full amount  of such Redemption  Price on all  such
outstanding  Preferred Securities called for redemption, shall have been made or
provided for, and  all funds available  to the Property  Trustee shall first  be
applied  to  the  payment  in  full  in  cash  of  all  distributions (including
Additional Amounts, if applicable) on, or the Redemption Price of such Preferred
Securities then due and payable. (Section 4.03(a)).
 
    In the case of any Event of  Default under a Trust Agreement, the holder  of
the  corresponding Common Securities will be deemed  to have waived any right to
act with respect to any such Event  of Default under such Trust Agreement  until
the effect of all such Events of Default with respect to corresponding Preferred
Securities  have  been cured,  waived or  otherwise  eliminated. Until  all such
Events of  Default under  such Trust  Agreement have  been so  cured, waived  or
otherwise  eliminated, the  Property Trustee shall  act solely on  behalf of the
holders of such  Preferred Securities and  not the holder  of the  corresponding
Common  Securities, and only the holders  of such Preferred Securities will have
the right  to direct  the Property  Trustee  to act  on their  behalf.  (Section
4.03(b)).
 
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
    Pursuant  to either  Trust Agreement, an  Issuer shall be  liquidated on the
first to occur of: (i)  the expiration of the term  of the relevant Trust;  (ii)
the  bankruptcy, dissolution  or liquidation of  a holder  of Common Securities;
(iii) the Depositor has  elected to cause  the Trust to  be dissolved after  the
occurrence  of a Special Event or in the event that the Trust is not or will not
be taxed  as  a grantor  trust  but  a Tax  Event  has not  occurred;  (iv)  the
redemption  of all of the Preferred Securities  of such series; and (v) an order
for dissolution  of the  Trust  issued by  a  court of  competent  jurisdiction.
(Sections 9.01 and 9.02).
 
    If  an  early  termination  occurs  as  described  in  clause  (iii)  of the
immediately preceding paragraph, the Issuer  in question shall be liquidated  as
expeditiously as practicable by having the Property Trustee
 
                                       9
<PAGE>
distribute,  subject to the receipt of an Opinion of Counsel experienced in such
matters to the  effect that  the holders of  the Preferred  Securities will  not
recognize gain or loss for United States Federal income tax purposes as a result
of  such distribution, to each holder of Preferred Securities of such Issuer and
the corresponding Common  Securities a Like  Amount of Debentures  held by  such
Issuer (a "Final Distribution"). However, in the event that the Property Trustee
determines  that such  Final Distribution  is impractical,  the holders  of such
Issuer Securities will be entitled to receive, out of the assets of such  Issuer
available  for distribution to holders after  satisfaction of all liabilities of
creditors, an amount equal to, in the case of holders of Issuer Securities,  the
aggregate  of  the stated  Liquidation Amount  of $25  per Issuer  Security plus
accrued and unpaid  distributions thereon to  the date of  payment (such  amount
being  the "Liquidation Distribution"). If  such Liquidation Distribution can be
paid only in part because an Issuer has insufficient assets available to pay  in
full  the aggregate Liquidation Distribution,  then the amounts payable directly
by such Issuer  on the  Issuer Securities  shall be paid  on a  pro rata  basis.
However,  if an Event of Default has  occurred and is continuing, the holders of
the Common Securities will  be entitled to receive  distributions upon any  such
dissolution only after the holders of the corresponding Preferred Securities. If
the  Debentures of  a particular  series are distributed  to the  holders of the
corresponding  Preferred  Securities,  Western  Resources  will  use  reasonable
efforts  to have such Debentures  listed on the New  York Stock Exchange or such
other exchange on which the corresponding Preferred Securities are then  listed.
If  an early termination occurs  as described in clause  (ii) of the immediately
preceding paragraph, a  liquidating trustee (the  "Liquidating Trustee") may  be
appointed  by  a majority  of  the aggregate  Liquidation  Amount of  the Issuer
Securities or by a court of competent jurisdiction. Any such Liquidating Trustee
shall (unless otherwise instructed by a court of competent jurisdiction) make  a
Final Distribution or, if deemed appropriate by such Liquidating Trustee, make a
Liquidation  Distribution, in substantially the  same manner as described above.
(Section 9.04).
 
EVENTS OF DEFAULT; NOTICE
 
    The occurrence of an  "Event of Default"  as defined in  Section 501 of  the
Indenture (see "Description of the Debentures -- Events of Default") constitutes
an "Event of Default" under the affected Trust Agreement.
 
    Within  five  Business Days  after the  occurrence of  any Event  of Default
actually known  to the  Property Trustee,  the Property  Trustee shall  transmit
notice  of  such Event  of  Default to  the  holders of  the  affected Preferred
Securities, the Administrative Trustees and the Depositor, unless such Event  of
Default shall have been cured or waived. (Section 8.02).
 
    Unless  an  Event of  Default  shall have  occurred  and be  continuing, any
Trustee with respect to a particular series of Issuer Securities may be  removed
at any time by act of Western Resources, as Depositor of the Issuer. If an Event
of  Default  has occurred  and  is continuing,  any  Trustee with  respect  to a
particular series of Issuer Securities may be removed at such time by act of the
holders of a majority in aggregate Liquidation Amount of the outstanding  Issuer
Securities of such series, delivered to such Trustee (in its individual capacity
and  on behalf of the  relevant Issuer). No resignation  or removal of a Trustee
and no  appointment  of  a  successor  Trustee  shall  be  effective  until  the
acceptance  of  appointment  by the  successor  Trustee in  accordance  with the
provisions of the applicable Trust Agreement. (Section 8.10).
 
    If an  Event  of Default  has  occurred  and is  continuing,  the  Preferred
Securities shall have a preference over the corresponding Common Securities upon
dissolution  of  the relevant  Issuer as  described  above. See  "-- Liquidation
Distribution Upon Dissolution."
 
MERGER OR CONSOLIDATION OF A TRUSTEE
 
    Any corporation into which either the Property Trustee or any Administrative
Trustee that is  not a  natural person may  be merged  or with which  it may  be
consolidated  or  any  corporation  resulting  from  any  merger,  conversion or
consolidation to which any such Trustee shall be a party shall be the  successor
to  such  Trustee  under  the Trust  Agreements,  provided  such  corporation is
otherwise qualified and eligible. (Section 8.12).
 
                                       10
<PAGE>
VOTING RIGHTS
 
    Except as  provided  below  and  under "Description  of  the  Guarantees  --
Amendments and Assignments" and as otherwise required by law, the holders of the
Preferred Securities will have no voting rights. (Section 6.01(a)).
 
    So  long as any Debentures of a particular series are held by an Issuer, the
Property Trustee shall not (i) direct  the time, method and place of  conducting
any  proceeding for any remedy available  to the Debenture Trustee, or executing
any trust  or power  conferred on  the  Debenture Trustee  with respect  to  the
Debentures  of such series, (ii) waive any  past default which is waivable under
Section 513 of the Indenture, (iii) exercise  any right to rescind or annul  any
declaration that the principal of all the Debentures of such series shall be due
and payable or (iv) consent to any amendment, modification or termination of the
Indenture  or  the  Debentures  of  such series,  where  such  consent  shall be
required, without, in each case, obtaining the prior approval of the holders  of
at  least a majority  in aggregate Liquidation Amount  of the outstanding Issuer
Securities of such  series; provided, however,  that where a  consent under  the
Indenture  would  require  the consent  of  each holder  of  Debentures affected
thereby, no such  consent shall  be given by  the Property  Trustee without  the
prior  consent  of each  holder of  the  Issuer Securities  of such  series. The
Property Trustee shall not revoke  any action previously authorized or  approved
by a vote of the holders of the Issuer Securities of a particular series, except
pursuant to a subsequent vote of the outstanding Issuer Securities. The Property
Trustee  shall notify all holders of an  affected series of Issuer Securities of
any notice  of default  received  from the  Debenture  Trustee. In  addition  to
obtaining  the foregoing approvals of the holders  of the Issuer Securities of a
particular series, prior to  taking any of the  foregoing actions, the  Property
Trustee  shall obtain an Opinion  of Counsel experienced in  such matters to the
effect that  the applicable  Issuer will  not be  classified as  an  association
taxable  as  a corporation  for  United States  Federal  income tax  purposes on
account of such action. (Section 6.01(b)).
 
    If any proposed  amendment to  a Trust  Agreement relating  to a  particular
series  of Issuer Securities provides for,  or the Trustees otherwise propose to
effect, (i) any action  that would adversely affect  the powers, preferences  or
special  rights of  the holders  of such  Issuer Securities,  whether by  way of
amendment  to  the  Trust  Agreement  relating  to  such  Issuer  Securities  or
otherwise,  or (ii) the dissolution, winding up  or termination of the Issuer of
such Issuer Securities, other than pursuant  to the Trust Agreement relating  to
such  series of  Issuer Securities, then  the holders of  the outstanding Issuer
Securities of  such  series  will be  entitled  to  vote on  such  amendment  or
proposal,  and such amendment or proposal shall not be effective except with the
approval of the holders of at  least a majority in aggregate Liquidation  Amount
of such outstanding Issuer Securities. (Section 6.01(c)).
 
    No  amendment to  a Trust  Agreement may  be made  if, as  a result  of such
amendment, the applicable Issuer would  be classified as an association  taxable
as  a  corporation  for  United States  Federal  income  tax  purposes. (Section
6.01(c)).
 
    Any required approval of  the holders of Issuer  Securities of a  particular
series may be given at a separate meeting of the holders of Issuer Securities of
such series convened for such purpose or pursuant to the written consent of such
holders. The Administrative Trustees will cause a notice of any meeting at which
holders  of such Issuer Securities  are entitled to vote,  or of any matter upon
which action by written consent of such holders  is to be taken, to be given  to
each  holder of record of such Issuer Securities  in the manner set forth in the
applicable Trust Agreement. (Section 6.02).
 
    No vote  or consent  of the  holders of  Issuer Securities  of a  particular
series  will be required for  the applicable Issuer to  redeem and cancel Issuer
Securities of such series in accordance with the applicable Trust Agreement.
 
    Notwithstanding that holders of  Issuer Securities are  entitled to vote  or
consent  under  any of  the  circumstances described  above,  any of  the Issuer
Securities that are owned by Western Resources, any Trustee or any affiliate  of
Western  Resources or any Trustee, shall, for  purposes of such vote or consent,
be treated as if they were not outstanding.
 
                                       11
<PAGE>
CO-PROPERTY TRUSTEES AND SEPARATE PROPERTY TRUSTEES
 
    Unless an Event of Default under  a Trust Agreement shall have occurred  and
be  continuing,  at any  time or  times, for  the purpose  of meeting  the legal
requirements of the Trust Indenture Act or of any jurisdiction in which any part
of the Trust Property (as defined in the applicable Trust Agreement) may at  the
time  be located, the Depositor and the Administrative Trustees shall have power
to appoint, and upon the written request of the Administrative Trustees, Western
Resources, as Depositor,  shall for  such purpose join  with the  Administrative
Trustees  in  the execution,  delivery and  performance  of all  instruments and
agreements necessary or proper  to appoint one or  more persons approved by  the
Property Trustee either to act as co-property trustee, jointly with the Property
Trustee,  of all  or any  part of  such Trust  Property, or  to act  as separate
trustee of any such Trust  Property, in either case with  such powers as may  be
provided in the instrument of appointment, and to vest in such person or persons
in  such  capacity, any  property,  title, right  or  power deemed  necessary or
desirable, subject  to the  provisions  of the  applicable Trust  Agreement.  If
Western  Resources, as  Depositor, does not  join in such  appointment within 15
days after the  receipt by it  of a request  to do so,  or in case  an Event  of
Default  under the Indenture has occurred  and is continuing, the Administrative
Trustees and the  Property Trustee shall  have power to  make such  appointment.
(Section 8.09).
 
PAYMENT AND PAYING AGENTS
 
    Payments  in respect of the Preferred Securities shall be made to DTC, which
shall credit the relevant accounts at  DTC on the applicable Distribution  Dates
or, if the Preferred Securities are not held by DTC, such payments shall be made
by  check mailed to the  address of the holder  entitled thereto as such address
shall appear on  the securities register.  The Paying Agent  shall initially  be
Wilmington  Trust  Company. The  Paying Agent  shall be  permitted to  resign as
Paying Agent upon 30  days' written notice to  the Administrative Trustees,  the
Property  Trustee and the Depositor. In  the event that Wilmington Trust Company
chooses no longer  to be  the Paying  Agent, the  Administrative Trustees  shall
appoint  a successor acceptable to the Property Trustee and Western Resources to
act as  Paying  Agent  (which shall  be  a  bank or  trust  company  or  Western
Resources). (Sections 4.04 and 5.08).
 
BOOK-ENTRY-ONLY ISSUANCE -- THE DEPOSITORY TRUST COMPANY
 
    DTC  will act  as securities  depositary for  the Preferred  Securities. The
Preferred  Securities  will  be  issued  only  as  fully-registered   securities
registered   in  the  name  of   Cede  &  Co.  (DTC's   nominee).  One  or  more
fully-registered  global  Preferred  Security   certificates  will  be   issued,
representing in the aggregate the total number of Preferred Securities, and will
be deposited with Wilmington Trust Company, as custodian for DTC.
 
    DTC  is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law,  a
member  of  the  Federal Reserve  System,  a "clearing  corporation"  within the
meaning of  the  New York  Uniform  Commercial  Code, and  a  "clearing  agency"
registered  pursuant to the provisions  of Section 17A of  the Exchange Act. DTC
holds the securities that its participants ("Participants") deposit with it. DTC
facilitates the settlement of securities transactions among Participants through
electronic computerized book-entry  changes in  Participants' accounts,  thereby
eliminating  the need for  physical movement of  securities certificates. Direct
Participants  include  securities  brokers,  securities  dealers,  banks,  trust
companies,  clearing  corporations  and  certain  other  organizations  ("Direct
Participants"). DTC is owned by a number of its Direct Participants, as well  as
by  the New  York Stock  Exchange, the  American Stock  Exchange, Inc.,  and the
National Association of  Securities Dealers, Inc.  Access to the  DTC system  is
also  available to others such as  securities brokers, securities dealers, banks
and trust companies that clear through or maintain a custodial relationship with
a Direct Participant, either  directly or indirectly ("Indirect  Participants").
The  rules  applicable  to  DTC  and  its  Participants  are  on  file  with the
Commission.
 
    Purchases of Preferred Securities within the  DTC system must be made by  or
through  Direct  Participants, which  will receive  a  credit for  the Preferred
Securities on DTC's records. The ownership interest of each actual purchaser  of
each  Preferred Security ("Beneficial Owner") is,  in turn, recorded on a Direct
or Indirect Participant's records,  as the case may  be. Beneficial Owners  will
not receive written
 
                                       12
<PAGE>
confirmation  from DTC of their purchases, but Beneficial Owners are expected to
receive written confirmations providing details of the transactions, as well  as
periodic  statements of their  holdings, from the  respective Direct or Indirect
Participants through which the Beneficial Owners purchased Preferred Securities.
Transfers of ownership interests in  the Preferred Securities are also  effected
by  entries made  on the  books of Participants  acting on  behalf of Beneficial
Owners. Beneficial  Owners  will  not receive  certificates  representing  their
ownership interests in Preferred Securities, except in the event that use of the
book-entry system for the Preferred Securities is discontinued.
 
    DTC  has  no knowledge  of  the actual  Beneficial  Owners of  the Preferred
Securities; DTC's records reflect only  the identity of the Direct  Participants
to  whose accounts such Preferred Securities are  credited, which may or may not
be the Beneficial Owners. The  Participants are responsible for keeping  account
of their holdings on behalf of their customers.
 
    Conveyance   of  notices   and  other   communications  by   DTC  to  Direct
Participants, by Direct  Participants to  Indirect Participants,  and by  Direct
Participants  and Indirect Participants to Beneficial Owners will be governed by
the arrangements  made  among  them,  subject to  any  statutory  or  regulatory
requirements as may be in effect from time to time.
 
    Redemption  notices, if any,  will be sent to  DTC. If less  than all of the
Preferred Securities of a particular  series are being redeemed, DTC's  practice
is  to determine  by lot  the amount  of the  Preferred Securities  held by each
Direct Participant in such series to be redeemed.
 
    Although voting with respect to the  Preferred Securities is limited to  the
holders  of record of the  Preferred Securities, in those  cases where a vote is
required neither DTC nor Cede & Co. will itself consent or vote with respect  to
any  Preferred Securities. Under its usual procedures, DTC would mail an Omnibus
Proxy to the Issuer as soon as possible after the record date. The Omnibus Proxy
assigns Cede & Co.'s  consenting or voting rights  to those Direct  Participants
(identified  in a listing attached  to the Omnibus Proxy)  to whose accounts the
Preferred Securities are credited on the record date.
 
    Distribution payments on the Preferred Securities will be made by the Issuer
to DTC.  DTC's  practice is  to  credit  Direct Participants'  accounts  on  the
relevant  payment date in accordance with  their respective holdings as shown on
DTC's records,  unless  DTC has  reason  to believe  that  it will  not  receive
payments  on such  payment date. Payments  by Participants  to Beneficial Owners
will be governed by  standing instructions and customary  practices and will  be
the responsibility of such Participants and not of DTC, the applicable Issuer or
Western Resources, subject to any statutory or regulatory requirements as may be
in   effect  from  time  to  time.  Payment  of  distributions  to  DTC  is  the
responsibility of  the Issuer  in  question, disbursement  of such  payments  to
Direct  Participants  is the  responsibility of  DTC,  and disbursement  of such
payments to  the  Beneficial Owners  is  the  responsibility of  the  Direct  or
Indirect  Participants  in whose  accounts  the Preferred  Securities  are held,
respectively.
 
    DTC may discontinue  providing its  services as  securities depositary  with
respect  to the Preferred Securities at any  time by giving reasonable notice to
the Issuer in  question. If DTC  stops providing such  services and a  successor
securities  depositary is not obtained,  Preferred Security certificates for the
affected series must be printed and delivered. Additionally, the  Administrative
Trustees (with the consent of Western Resources) could decide to discontinue use
of  the system of book-entry transfers  through DTC (or a successor depositary).
In that event,  definitive certificates  for the Preferred  Securities would  be
printed and delivered.
 
    The  information in this Section concerning  DTC and DTC's book-entry system
has been obtained from sources that Western Resources and the Issuers believe to
be reliable. None of  Western Resources or the  Issuers have responsibility  for
the  performance by DTC  or its Participants of  their respective obligations as
described herein or under  the rules and  procedures governing their  respective
operations.
 
                                       13
<PAGE>
REGISTRAR AND TRANSFER AGENT
 
    Wilmington Trust Company will act as Securities Registrar and transfer agent
for the Issuer Securities. (Section 5.04).
 
    Registration  of  transfers of  Issuer Securities  will be  effected without
charge by or on behalf  of either Issuer, but upon  payment (with the giving  of
such indemnity as the Issuer or Western Resources may require) in respect of any
tax  or other governmental charges which may be imposed in connection therewith.
(Section 5.04).
 
    The Securities Registrar  will not be  required to register  or cause to  be
registered  any transfer of Issuer Securities  of a particular series after they
have been called for redemption. (Section 5.04).
 
INFORMATION CONCERNING THE PROPERTY TRUSTEE
 
    The  Property  Trustee  undertakes  to  perform  only  such  duties  as  are
specifically  set forth in such  Trust Agreement and, after  an Event of Default
under the  Indenture, must  exercise the  same degree  of care  and skill  as  a
prudent  person would exercise or use in the  conduct of his or her own affairs.
Subject to  this provision,  the  Property Trustee  is  under no  obligation  to
exercise  any of the powers vested in it  by the Indenture at the request of any
holder of Preferred Securities or Debentures  of a particular series unless  the
Property Trustee is offered reasonable indemnity against the costs, expenses and
liabilities that might be incurred thereby. (Section 8.01).
 
    Western  Resources  conducts other  banking  transactions with  the Property
Trustee in the ordinary course of its business.
 
MODIFICATION OF THE TRUST AGREEMENTS
 
    From time  to time,  Western Resources  and the  Trustees may,  without  the
consent of any holders of the Preferred Securities, amend either Trust Agreement
for  specified purposes, including, among other things, (i) to cure ambiguities,
correct or  supplement any  provision of  either Trust  Agreement which  may  be
inconsistent  with any other  provision thereof or to  make any other provisions
with respect to matters  or questions arising under  such Trust Agreement  which
shall  not be inconsistent with the other provisions of such Trust Agreement, or
(ii) to ensure that  a Trust will  not be classified  for United States  Federal
income  tax purposes as an association taxable  as a corporation and will not be
required to register as  an "investment company" under  the 1940 Act;  provided,
however,  that such amendment or action shall not adversely affect the rights of
any holder of the  Issuer Securities. Each  Trust Agreement contains  provisions
permitting  Western Resources and the Trustees,  with the consent of the holders
of not less than a majority  in aggregate Liquidation Amount of the  outstanding
Issuer  Securities related thereto and upon receipt of an appropriate opinion of
counsel, to modify such Trust Agreement in a manner affecting the rights of  the
holders  of  such Issuer  Securities; provided  that  no such  modification may,
without the  consent of  the holder  of each  such outstanding  Issuer  Security
affected  by the proposed  modification (i) change  the amount or  timing of any
distribution on such Issuer Securities or otherwise adversely affect the  amount
of  any distribution required to be made in respect of such Issuer Securities as
of a specified date,  or (ii) restrict  the right of any  holder of such  Issuer
Securities to institute suit for the enforcement of any payment under such Trust
Agreement. (Section 10.02).
 
GOVERNING LAW
 
    Each  Trust Agreement will be governed by, and construed in accordance with,
the laws of the State of Delaware. (Section 10.05).
 
MISCELLANEOUS
 
    The Administrative  Trustees  are authorized  and  directed to  conduct  the
affairs of each Issuer and to operate each Issuer so that neither Issuer will be
deemed  to be an "investment  company" required to be  registered under the 1940
Act or be taxed as a corporation  for United States Federal income tax  purposes
and  so that the Debentures will be treated as indebtedness of Western Resources
for  United  States  Federal  income  tax  purposes.  In  this  connection,  the
Administrative Trustees are authorized to take any action, not inconsistent with
applicable  law,  the  certificate  of  trust  of  either  Issuer  or  the Trust
 
                                       14
<PAGE>
Agreements, that the Administrative Trustees determine in their discretion to be
necessary or  desirable for  such purposes,  as  long as  such action  does  not
adversely  affect  the  interest of  the  holders of  the  Preferred Securities.
(Section 2.07).
 
    Holders of the Preferred Securities have no preemptive rights.
 
                         DESCRIPTION OF THE GUARANTEES
 
GENERAL
 
    Set forth below is certain  information concerning the Guarantees that  will
be  executed and delivered by  Western Resources for the  benefit of the holders
from time  to time  of  Preferred Securities  of  each particular  series.  Each
Guarantee  will  be qualified  as an  indenture under  the Trust  Indenture Act.
Wilmington Trust Company will act as indenture trustee (the "Guarantee Trustee")
under each Guarantee for  purposes of compliance with  the Trust Indenture  Act.
The  terms of each Guarantee will be those set forth in such Guarantee and those
made part of such Guarantee  by the Trust Indenture  Act. This summary does  not
purport  to be complete and is subject in all respects to the provisions of, and
is qualified in its entirety by reference to, the Guarantees, a form of which is
filed as an exhibit to the Registration Statement of which this Prospectus is  a
part,  and of  the Trust  Indenture Act.  The Guarantee  Trustee will  hold each
Guarantee for  the  benefit  of  the  holders  of  the  corresponding  Preferred
Securities. Whenever particular provisions of or defined terms in the Guarantees
are  referred  to, such  sections or  defined terms  are incorporated  herein by
reference. Section references used  herein are references  to provisions of  the
Guarantees unless otherwise stated.
 
    Western  Resources will  agree, on a  subordinated basis, to  the extent set
forth below, to make the  Guarantee Payments (as defined  below) in full to  the
holders  of the Preferred Securities of a particular series (without duplication
of amounts theretofore paid by the  applicable Issuer with respect thereto),  as
and  when due, regardless of any defense,  right of set-off or counterclaim that
such Issuer may have or assert other than the defense of payment. (Section 5.1).
The following payments with respect to the Preferred Securities of a  particular
series,  to the extent  not paid by or  on behalf of  the applicable Issuer (the
"Guarantee Payments"),  will  be  subject  to  the  related  Guarantee  (without
duplication):  (i) any accrued  and unpaid distributions required  to be paid on
the Preferred Securities  of such series,  if and  only to the  extent that  the
applicable Issuer has funds sufficient to make such payment; (ii) the Redemption
Price with respect to any such Preferred Securities called for redemption by the
applicable  Issuer, if  and only  to the extent  that the  applicable Issuer has
funds sufficient to make such payment; and (iii) upon a voluntary or involuntary
dissolution, winding-up or termination of such Issuer (other than in  connection
with  a redemption of all of the corresponding Preferred Securities), the lesser
of (a) the aggregate Liquidation Amount and all accrued and unpaid distributions
on such Preferred Securities to  the date of payment,  to the extent the  Issuer
has funds sufficient to make such payment, and (b) such amount of assets of such
Issuer  remaining  available  for  distribution  to  holders  of  such Preferred
Securities in  liquidation of  such Issuer.  (Section 1.1).  Western  Resources'
obligation to make a Guarantee Payment may be satisfied by direct payment of the
required  amounts  by  Western  Resources  to  the  holders  of  such  Preferred
Securities or  by causing  the applicable  Issuer to  pay such  amounts to  such
holders. (Section 5.1).
 
    Each  Guarantee will be a guarantee on  a subordinated basis with respect to
the Preferred  Securities of  the  corresponding series  from  the time  of  the
issuance  of such Preferred Securities, but will not apply (i) to any payment of
distributions if and to the extent that the Issuer with respect thereto does not
have funds  sufficient  to make  such  payments or  (ii)  to the  collection  of
payment.  If Western Resources  does not make  interest payments on  a series of
Debentures held by  an Issuer,  it is  expected that  such Issuer  will not  pay
distributions on such Preferred Securities. The Guarantees will rank subordinate
and  junior in right of payment to  all liabilities of Western Resources (except
trade credit and any liabilities that may be made pari passu with or subordinate
to the Guarantees expressly  by their terms, i.e.,  another Guarantee). See  "--
Status of the Guarantees."
 
                                       15
<PAGE>
    With  respect to a particular series of Preferred Securities, the mechanisms
and obligations relating  to the corresponding  Guarantee and the  corresponding
series  of  Debentures  and  the  obligations  of  Western  Resources  under the
applicable Trust Agreement to pay certain obligations, costs and expenses of the
Issuer (the  "Expense  Agreement," and,  with  respect to  such  obligations  of
Western  Resources under each Trust  Agreement, the "Expense Agreements"), taken
together, are  a  full  and  unconditional  subordinated  guarantee  by  Western
Resources   of  payments  due  on  such  series  of  Preferred  Securities.  See
"Description  of  the   Debentures"  and  "Relationship   Among  the   Preferred
Securities, the Debentures and the Guarantees."
 
AMENDMENTS AND ASSIGNMENTS
 
    Except  with respect to any changes that  do not adversely affect the rights
of the holders of Preferred Securities of a particular series (in which case  no
consent  of such  holders will  be required),  the terms  of a  Guarantee may be
changed only with the prior approval of the holders of not less than a  majority
in  aggregate Liquidation Amount  of such outstanding  Preferred Securities. All
guarantees and agreements contained  in any Guarantee will  be binding upon  the
successors,   assigns,  receivers,  trustees   and  representatives  of  Western
Resources, and shall inure  to the benefit of  the holders of the  corresponding
Preferred Securities then outstanding. (Sections 8.1 and 8.2).
 
EVENTS OF DEFAULT
 
    An event of default under a Guarantee will occur upon the failure of Western
Resources  to perform any of its  payment obligations thereunder. (Section 1.1).
The holders  of a  majority in  aggregate Liquidation  Amount of  the  Preferred
Securities  of the affected series have the right to direct the time, method and
place of conducting  any proceeding for  any remedy available  to the  Guarantee
Trustee  in respect of such Guarantee or to  direct the exercise of any trust or
power conferred upon the Guarantee Trustee under such Guarantee. (Section 5.4).
 
    If the Guarantee  Trustee fails to  enforce a Guarantee,  any holder of  the
corresponding  series of Preferred  Securities may institute  a legal proceeding
directly against Western Resources  to enforce such  Holder's rights under  such
Guarantee  without first instituting  a legal proceeding  against the applicable
Issuer, the Guarantee Trustee or any other person or entity. (Section 5.4).
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
    The Guarantee Trustee, other than during the occurrence and continuance of a
default by Western Resources  in the performance of  a Guarantee, undertakes  to
perform  only such duties as  are specifically set forth  in the Guarantees and,
after default with respect  to any Guarantee, must  exercise the same degree  of
care  and skill as a prudent person would  exercise or use in the conduct of his
or her own affairs. Subject to this provision, the Guarantee Trustee is under no
obligation to exercise  any of the  powers vested in  it by a  Guarantee at  the
request  of any holder of Preferred Securities of a particular series unless the
Guarantee Trustee is  offered reasonable indemnity  against the costs,  expenses
and liabilities that might be incurred thereby. (Sections 3.1 and 3.2).
 
TERMINATION OF THE GUARANTEES
 
    A  Guarantee will terminate and be of  no further force and effect upon full
payment of the Redemption Price of all Preferred Securities of the corresponding
series, the distribution of Debentures of  the applicable series to the  holders
of such Preferred Securities in exchange for all of such Preferred Securities or
upon  payment in  full of  the amounts payable  upon liquidation  of the related
Issuer. Notwithstanding  the  foregoing,  each Guarantee  will  continue  to  be
effective  or will be reinstated, as the case  may be, if at any time any holder
of Preferred  Securities  must restore  payment  of  any sums  paid  under  such
Preferred Securities or the related Guarantee. (Section 7.1).
 
STATUS OF THE GUARANTEES
 
    Each  Guarantee will constitute an unsecured obligation of Western Resources
and will  rank  subordinate  and  junior  in right  of  payment  to  all  Senior
Indebtedness (as defined above) of Western
 
                                       16
<PAGE>
Resources.  (Section 6.1).  Each Trust  Agreement provides  that each  holder of
Preferred Securities of a particular series by acceptance thereof agrees to  the
subordination provisions and other terms of the related Guarantee.
 
    Each  Guarantee will rank pari passu with  each other Guarantee and with any
similar guarantees issued by the Guarantor on behalf of the holders of Preferred
Securities issued  by  any other  Issuer  holding Debentures  issued  under  the
Indenture. (Section 6.2).
 
    Each  Guarantee will constitute a guarantee of payment and not of collection
(i.e., the guaranteed party  may institute a  legal proceeding directly  against
the Guarantor to enforce its rights under the applicable Guarantee without first
instituting  a legal  proceeding against any  other person  or entity). (Section
5.5).
 
GOVERNING LAW
 
    Each Guarantee will be governed by and construed in accordance with the laws
of the State of New York. (Section 8.5).
 
                         DESCRIPTION OF THE DEBENTURES
 
GENERAL
 
    Set forth below is  a description of certain  terms of the Debentures  which
each  Issuer will purchase  with its Common  Securities and the  proceeds of the
issuance and sale of such  Issuer's Preferred Securities. The following  summary
does  not purport  to be  complete and  is subject  in all  respects to,  and is
qualified in its entirety by reference to, the Indenture, as supplemented by the
Supplemental  Indenture  creating  each  series  of  Debentures,  from   Western
Resources to Wilmington Trust Company, as trustee with respect to the Debentures
(the  "Debenture Trustee"),  the forms  of which  are filed  as exhibits  to the
Registration Statement  of  which this  Prospectus  is  a part,  and  the  Trust
Indenture  Act.  Whenever  particular  provisions of  or  defined  terms  in the
Indenture or  the  Supplemental Indenture  are  referred to,  such  sections  or
defined  terms  are incorporated  herein by  reference. Section  references used
herein are references to provisions of the Indenture unless otherwise stated.
 
    Concurrently with the  issuance of each  Issuer's Preferred Securities,  the
Issuer  will invest the proceeds thereof in a corresponding series of Debentures
newly issued by Western Resources. The Debentures will be unsecured subordinated
obligations of  Western Resources  issued under  the Indenture.  Each series  of
Debentures  will  be  in  a  principal  amount  equal  to  the  aggregate stated
Liquidation Amount  of  the  corresponding  Preferred  Securities  plus  Western
Resources'  concurrent investment  in the Common  Securities and  will rank pari
passu with all  other series  of Debentures. The  Indenture does  not limit  the
aggregate principal amount of Debentures which may be issued thereunder.
 
OPTIONAL REDEMPTION
 
    Western Resources will have the right, at any time and from time to time, as
set  forth  in an  applicable Supplemental  Indenture, to  redeem any  series of
Debentures, in whole  or in part,  at a redemption  price as set  forth in  such
Supplemental  Indenture, together with any  accrued but unpaid interest thereon,
including any Additional Interest (as defined below) to the redemption date.
 
    If a Special Event  shall occur and be  continuing, Western Resources  shall
have  the right to redeem any series of  Debentures in whole but not in part, at
the Redemption Price  plus any  accrued and unpaid  interest on  such series  of
Debentures,  including any Additional  Interest, if any,  to the redemption date
fixed for redemption for  such series (the "Redemption  Date"). (Section 102  of
the Supplemental Indenture).
 
    For  so long as an Issuer is the holder of all the outstanding Debentures of
a particular series, the proceeds  of any such redemption  will be used by  such
Issuer  to  redeem Preferred  Securities of  such  series and  the corresponding
Common Securities  in accordance  with their  terms. Western  Resources may  not
redeem  any series of Debentures in part  unless all accrued and unpaid interest
thereon
 
                                       17
<PAGE>
(including any Additional  Interest) has been  paid in full  on all  outstanding
Debentures  of such series for all  quarterly interest periods terminating on or
prior to the Redemption Date. (Section 102 of the Supplemental Indenture).
 
    Any optional redemption of any series  of Debentures shall be made upon  not
less  than 30 nor  more than 90 days'  notice to the holders  thereof. If at the
time of mailing  of any notice  of redemption Western  Resources shall not  have
deposited  with the Debenture Trustee (and/or irrevocably directed the Debenture
Trustee to apply, from money held by it available to be used for the  redemption
of  Debentures) an amount in cash sufficient  to redeem all of the Debentures to
be redeemed, including  accrued interest  to such Redemption  Date, such  notice
shall state that the proposed redemption to which such notice relates is subject
to the deposit of such amount with the Trustee on or before the Redemption Date.
(Section 1204).
 
    After  notice  of redemption  is given  and Western  Resources having  on or
before the Redemption Date deposited  with the Debenture Trustee (and/or  having
irrevocably  directed  the Debenture  Trustee to  apply, from  money held  by it
available to  be  used for  the  redemption of  Debentures)  an amount  in  cash
sufficient  to redeem all of the Debentures to be redeemed, the Debentures so to
be redeemed will, on the  Redemption Date, become due  and payable and from  and
after such date, such Debentures will cease to bear interest. (Section 1206).
 
INTEREST
 
    The  Debentures of a particular  series shall bear interest  at the rate per
annum set  forth in  the applicable  Supplemental Indenture  and from  the  date
specified  therein. Such interest shall be payable quarterly in arrears on March
31, June 30,  September 30  and December  31 of  each year  (each, an  "Interest
Payment  Date"), subject to certain exceptions, to the person in whose name such
Debentures are registered,  at the close  of business on  the Business Day  next
preceding  such Interest Payment Date. (Section 307 of the Indenture and Section
101 of the Supplemental Indenture). It  is anticipated that the Debentures  will
be  held in the  name of the  Property Trustee in  trust for the  benefit of the
holders of the corresponding Issuer Securities.
 
    The amount of interest payable for any period will be computed on the  basis
of  a 360-day year  of twelve 30-day months  and, for any  period shorter than a
full monthly period, shall be computed on the basis of the actual number of days
elapsed in such  period. (Section  310). In  the event  that any  date on  which
interest is payable on the Debentures is not a Business Day, then payment of the
interest payable on such date will be made on the next succeeding day which is a
Business  Day (and without any interest or  other payment in respect of any such
delay), except that,  if such Business  Day is in  the next succeeding  calendar
year,  such payment shall be made on  the immediately preceding Business Day, in
each case with the same force and effect as if made on the date the payment  was
originally payable. (Section 101 of the Supplemental Indenture).
 
WESTERN RESOURCES' OPTION TO EXTEND INTEREST PAYMENT PERIODS
 
    Western  Resources shall have the  right, at any time  and from time to time
while the Debentures  of any particular  series are outstanding,  so long as  an
Event  of Default  has not  occurred or  is continuing,  to extend  the interest
payment period on  such Debentures  for a  period not  exceeding 20  consecutive
quarters  (the "Extension  Period") during  which period  interest will compound
quarterly. At the end of any  such Extension Period, Western Resources must  pay
all interest then accrued and unpaid (together with interest thereon at the rate
specified for such Debentures to the extent permitted by applicable law). During
any  such  Extension  Period,  Western  Resources may  not  declare  or  pay any
dividends or distributions  (other than  dividends or  distributions payable  in
common stock of Western Resources or other securities ranking junior in right of
payment  to the Debentures of such series)  on, or redeem, purchase, acquire, or
make a liquidation  payment with respect  to, any  of its capital  stock or  any
security ranking pari passu with or junior in right of payment to the Debentures
of  such series,  or make  any guarantee payment  with respect  to the foregoing
(other than pro rata payments under the Guarantees) or repurchase, or cause  any
of  its subsidiaries  to repurchase, any  security of  Western Resources ranking
pari passu with or junior in right  of payment to the Debentures of such  series
(except for payments made
 
                                       18
<PAGE>
on  any  series of  Debentures  upon the  stated  maturity of  such Debentures);
provided that  Western  Resources  may  redeem,  purchase,  acquire  or  make  a
liquidation  payment with respect  to any of  its capital stock  or any security
ranking pari passu with or junior in right of payment to the Debentures of  such
series,  make any guarantee payment with respect to the foregoing or repurchase,
or cause  any  of  its  subsidiaries to  repurchase,  any  security  of  Western
Resources  ranking  pari  passu  with  or junior  in  right  of  payment  to the
Debentures of such series with securities (or the proceeds from the issuance  of
securities)  having  no  higher ranking  than  the  capital stock  or  the other
securities which are to be redeemed, purchased, acquired, with respect to  which
a  liquidation payment is to be made, to which a guarantee payment is to be made
with respect to  the foregoing or  which are to  be repurchased. Such  Extension
Period  together with all  such previous and further  extensions thereof may not
exceed 20 consecutive quarters or extend beyond the maturity date or  Redemption
Date  of such Debentures. Upon the termination  of any such Extension Period and
the payment  of  all  amounts then  due,  Western  Resources may  select  a  new
Extension  Period, subject to  the foregoing requirements.  No interest shall be
due and payable during an Extension Period,  except at the end thereof. So  long
as  the Property  Trustee shall  be the sole  holder of  the Debentures, Western
Resources must give the  Property Trustee, the  Administrative Trustees and  the
Debenture  Trustee notice of its selection of such Extension Period at least one
Business Day prior to the earlier of  (i) the date that the distribution on  the
corresponding   Preferred   Securities  is   payable  or   (ii)  the   date  the
Administrative Trustees  are required  to  give notice  to  the New  York  Stock
Exchange  or other applicable self-regulatory organization  or to holders of the
Preferred Securities of such series of the  record date for the payment of  such
distribution or the date such distribution is payable, but in any event not less
than  one Business Day prior to such  record date. The Debenture Trustee will be
required to give prompt notice of Western Resources' selection of such Extension
Period to  the  holders  of  the Preferred  Securities  and  the  Administrative
Trustees. (Section 101 of the Supplemental Indenture).
 
ADDITIONAL INTEREST
 
    If  at  any  time  an  Issuer  shall  be  required  to  pay  any  additional
distributions on distributions in arrears in respect of the Preferred Securities
of a particular series pursuant to the terms thereof, Western Resources will pay
as interest to such Issuer, as the holder of the Debentures of the corresponding
series, an amount of additional  interest ("Additional Interest Attributable  to
Deferral")   equal  to  such  additional  distributions.  Accordingly,  in  such
circumstances Western  Resources  will,  to  the  fullest  extent  permitted  by
applicable  law, pay  interest upon interest  in order to  provide for quarterly
compounding on such Debentures. In addition, if an Issuer is required to pay any
taxes, duties, assessments  or governmental  charges of  whatever nature  (other
than  withholding  taxes)  imposed by  the  United  States or  any  other taxing
authority, then, in each case, Western  Resources will also pay such amounts  as
shall  be required so that the net  amounts received and retained by such Issuer
after paying such taxes, duties, assessments or governmental charges will be not
less than the amounts such Issuer would have received had no such taxes, duties,
assessments  or  governmental   charges  been   imposed  ("Additional   Interest
Attributable  to Taxes," and, together  with Additional Interest Attributable to
Deferral, "Additional Interest"). (Section 101 of the Indenture and Section  101
of the Supplemental Indenture).
 
RIGHT OF SET-OFF
 
    Notwithstanding anything to the contrary in the Indenture, Western Resources
shall  have the right  to set-off any  payment it is  otherwise required to make
thereunder  to  the  extent  Western  Resources  has  theretofore  made,  or  is
concurrently  on the date  of such payment,  making a payment  under the related
Guarantee. (Section 311).
 
SUBORDINATION
 
    The Debentures will  be subordinate and  junior in right  of payment to  the
prior  payment, in full in cash or  cash equivalents, of all Senior Indebtedness
(as defined below). (Sections 101 and 1101). In the event of (a) any  insolvency
or   bankruptcy   case  or   proceeding,   or  any   receivership,  liquidation,
reorganization or  other similar  case or  proceeding in  connection  therewith,
relating to Western Resources or to its creditors, as such, or to its assets, or
(b)  any  liquidation, dissolution  or other  winding  up of  Western Resources,
whether voluntary  or involuntary  and whether  or not  involving insolvency  or
bankruptcy, or
 
                                       19
<PAGE>
(c)  any assignment  for the  benefit of creditors  or any  other marshalling of
assets and liabilities of Western Resources (except a distribution in connection
with a  consolidation  of Western  Resources  with,  or the  merger  of  Western
Resources into, another corporation or the liquidation or dissolution of Western
Resources  following conveyance, transfer or lease  of its properties and assets
substantially  as  an  entirety  to  another  corporation  upon  the  terms  and
conditions  described  below under  "--  Consolidation, Merger  and  Sale"), the
holders of all Senior Indebtedness will  be entitled to receive payment in  full
in  cash or cash equivalents of all amounts due or to become due thereon, before
the holders of Debentures are entitled to receive any payment on account of  the
principal  of or interest on the Debentures;  and any payment or distribution of
assets of Western Resources of any kind or character, whether in cash,  property
or  securities, by set-off or otherwise, to  which the holders of the Debentures
or the  Debenture  Trustee would  be  entitled but  for  the provisions  of  the
Indenture  relating to subordination shall be paid by the liquidating trustee or
agent or  other person  making  such payment  or  distribution directly  to  the
holders  of  Senior  Indebtedness  ratably according  to  the  aggregate amounts
remaining unpaid on account of the  Senior Indebtedness to the extent  necessary
to  make payment in full in cash  or cash equivalents of all Senior Indebtedness
remaining  unpaid.  In  the  event  that,  notwithstanding  the  foregoing,  the
Debenture Trustee or any holder of the Debentures shall have received payment or
distribution  of assets of Western Resources of any kind or character (excluding
certain permitted  subordinated securities)  before all  Senior Indebtedness  is
paid  in full or payment thereof provided for, then such payment or distribution
will be  paid  over  or  delivered  to  the  trustee  in  bankruptcy,  receiver,
liquidating  trustee, custodian, assignee, agent  or other person making payment
or distribution  of the  assets  of Western  Resources  for application  to  the
payment  of all Senior Indebtedness remaining  unpaid to the extent necessary to
pay all Senior Indebtedness in full in cash or cash equivalents. (Section 1102).
 
    Western Resources  is prohibited  from  making payments  on account  of  the
principal  of or  interest on the  Debentures or  on account of  the purchase or
redemption or other acquisition of the  Debentures if there shall have  occurred
and  be continuing:  (a) a  default in  any payment  with respect  to any Senior
Indebtedness (as defined herein) or (b) any other event of default with  respect
to  any  Senior  Indebtedness  resulting in  the  acceleration  of  the maturity
thereof. (Section 1103). In the event  that Western Resources makes any  payment
to  the  Debenture Trustee  or any  holder  of any  series of  Debentures, which
payment is prohibited by the foregoing, then such payment is required to be paid
over to  the representative  of  the holders  of  the Senior  Indebtedness  then
outstanding to the extent necessary to pay in full, in cash or cash equivalents,
all Senior Indebtedness. (Section 1103).
 
    Subject  to the payment in  full of all Senior  Indebtedness, the holders of
the Debentures  shall be  subrogated to  the  rights of  the holders  of  Senior
Indebtedness  to  receive  payments  and  distributions  of  assets  of  Western
Resources applicable to the Senior Indebtedness until the Debentures are paid in
full. (Section 1105).
 
    If Western Resources  fails to make  any payment on  a series of  Debentures
when  due or within any applicable grace period, such failure will constitute an
Event of Default under the related Indenture. See "Events of Default."
 
    As of September 30, 1995, the  Senior Indebtedness of Western Resources  was
approximately  $1.8 billion. As a holding company, certain of Western Resources'
assets consist  of the  stock of  its subsidiaries.  Except to  the extent  that
Western  Resources  may  itself be  a  creditor with  recognized  claims against
Western Resources' subsidiaries, the claims of the holders of the Debentures  to
the assets of the subsidiaries of Western Resources effectively are subordinated
to  the claims of  direct creditors of  such subsidiaries. See  "Risk Factors --
Holding Company Structure" in the accompanying Prospectus Supplement.
 
                                       20
<PAGE>
    The term "Senior Indebtedness" shall mean the principal of, interest on  and
any  other payment due pursuant to any  of the following, whether outstanding at
the date  of execution  of any  Supplemental Indenture  or thereafter  incurred,
created or assumed:
 
        (a) all indebtedness of Western Resources on a consolidated basis (other
    than  any obligations  to trade  creditors) evidenced  by notes, debentures,
    bonds or other securities sold by  Western Resources for money borrowed  and
    capitalized lease obligations;
 
        (b)  all indebtedness of others of  the kinds described in the preceding
    clause (a) assumed by or guaranteed in any manner by Western Resources or in
    effect guaranteed by Western Resources;
 
        (c) all  obligations  of Western  Resources  issued or  assumed  as  the
    deferred  purchase price  of property,  all conditional  sale obligations of
    Western Resources and all obligations  of Western Resources under any  title
    retention agreement (but excluding trade accounts payable);
 
        (d)  certain obligations of  Western Resources for  the reimbursement of
    any obligor on any letter of credit, banker's acceptance, security  purchase
    facility,  surety bond  or similar  credit transaction  entered into  in the
    ordinary course of business of Western Resources; and
 
        (e) all renewals, extensions or refundings of indebtedness of the  kinds
    described in either of the preceding clauses (a) through (d);
 
unless,   in  the  case  of   any  particular  indebtedness,  capitalized  lease
obligation, guarantee, renewal, extension or refunding, the instrument  creating
or  evidencing the  same or  the assumption or  guarantee of  the same expressly
provides that such indebtedness,  renewal, extension or  refunding is made  pari
passu with or subordinate to the Debentures. (Section 101).
 
    Notwithstanding  the  foregoing, each  series of  Debentures will  rank pari
passu with each other series of Debentures.
 
    The Indenture does  not limit  the aggregate amount  of Senior  Indebtedness
that may be issued.
 
CERTAIN COVENANTS OF WESTERN RESOURCES
 
    In  the Indenture, Western  Resources covenants that it  will not declare or
pay any  dividends  or  distributions (other  than  dividends  or  distributions
payable  in common stock of Western Resources or other securities ranking junior
in right of payment  to the Debentures  of a particular  series) on, or  redeem,
purchase,  acquire or  make a  liquidation payment with  respect to,  any of its
capital stock or  any security ranking  pari passu  with or junior  in right  of
payment  to the Debentures of  such series, or make  any guarantee payments with
respect to the foregoing (other than pro rata payments under the Guarantees)  or
repurchase,  or cause  any of  its subsidiaries  to repurchase,  any security of
Western Resources ranking pari passu with or  junior in right of payment to  the
Debentures  of such series (except for payments made on any series of Debentures
upon the stated maturity  of such Debentures);  provided that Western  Resources
may  redeem, purchase, acquire or make a liquidation payment with respect to any
of its capital stock or any security ranking pari passu with or junior in  right
of  payment to the  Debentures of such  series, make any  guarantee payment with
respect to the  foregoing or  repurchase, or cause  any of  its subsidiaries  to
repurchase,  any security of Western Resources ranking pari passu with or junior
in right of payment  to the Debentures  of such series  with securities (or  the
proceeds  from the  issuance of  securities) having  no higher  ranking than the
capital stock  or the  other securities  which are  to be  redeemed,  purchased,
acquired,  with respect to which a liquidation payment is to be made, to which a
guarantee payment is to be made with respect to the foregoing or which are to be
repurchased; if at such time  (i) there shall have  occurred any event of  which
Western Resources has actual knowledge that (a) with the giving of notice or the
lapse  of time, or  both, would constitute  an Event of  Default with respect to
such series of Debentures  under the Indenture and  (b) which Western  Resources
shall  not have taken reasonable steps to  cure, (ii) Western Resources shall be
in default with respect to its payment of any obligations under the Guarantee or
(iii) Western Resources shall have given notice of its selection of an Extension
Period as provided in the Indenture, and such Extension Period, or any extension
thereof, shall  have  commenced  and  be  continuing.  (Section  1005).  Western
Resources also covenants (i) not to
 
                                       21
<PAGE>
transfer  ownership of Common Securities of  the Issuer to which Debentures have
been issued  to any  person other  than  an Affiliate  of Western  Resources  as
permitted under the Indenture; provided that no such transfer will result in (x)
such  Issuer being  considered an  "investment company"  that is  required to be
registered under the  Investment Company  Act of 1940,  as amended,  or (y)  the
Issuer  not being taxed as a grantor  trust for United States Federal income tax
purposes, (ii) not to  voluntarily dissolve, wind up  or terminate each  Issuer,
except  in connection with  the distribution of  the corresponding Debentures to
the holders of the  Preferred Securities of such  Issuer in liquidation of  such
Issuer  or in connection  with certain mergers,  consolidations or amalgamations
permitted by the corresponding Trust Agreement  and (iii) to use its  reasonable
efforts,  consistent with  the terms and  provisions of  the corresponding Trust
Agreement, to cause such Issuer to remain  a grantor trust and otherwise not  to
be  classified  as an  association taxable  as a  corporation for  United States
Federal income tax purposes. (Section 1005).
 
EVENTS OF DEFAULT
 
    The Indenture will provide that any  one or more of the following  described
events  with  respect  to  a  series of  Debentures  that  has  occurred  and is
continuing constitutes an  "Event of  Default" with  respect to  such series  of
Debentures:
 
        (a)  failure  for  30  days  to  pay  any  interest  on  such  series of
    Debentures, including any Additional Interest  in respect thereof, when  due
    (subject  to  the deferral  of  any due  date in  the  case of  an Extension
    Period);
 
        (b) failure to pay any principal  on such series of Debentures when  due
    whether  at  maturity, upon  redemption  by declaration  of  acceleration or
    otherwise; except that, in the case  of an optional redemption, the  failure
    to redeem any Debenture which is the result of Western Resources' failure to
    deposit  on or before the Redemption Date with the Debenture Trustee (and/or
    having irrevocably directed the Debenture Trustee to apply, from money  held
    by  it available to be  used for the redemption  of Debentures) an amount in
    cash sufficient to redeem all of the Debentures to be redeemed, shall not be
    an Event  of Default,  but shall  be deemed  a rescission  of the  call  for
    redemption;
 
        (c)  failure to  observe or  perform in  any material  respect any other
    covenant relating to such  series of Debentures  contained in the  Indenture
    for  90 days  after written notice  to Western Resources  from the Debenture
    Trustee or  the  holders  of  at  least  25%  in  principal  amount  of  the
    outstanding Debentures of such series; or
 
        (d)  certain  events  in  bankruptcy,  insolvency  or  reorganization of
    Western Resources. (Section 501).
 
    If an Event  of Default has  occurred and  is continuing, the  holders of  a
majority  in outstanding principal amount of  each affected series of Debentures
have the right to direct the time, method and place of conducting any proceeding
for any remedy available to the Debenture Trustee. (Section 512). The  Debenture
Trustee  or the holders of not less  than 25% in aggregate outstanding principal
amount of such series of Debentures  may declare the principal and interest  due
and  payable  immediately upon  an Event  of Default,  and should  the Debenture
Trustee or such  holders of such  Debentures fail to  make such declaration  the
holders  of at least 25% in aggregate Liquidation Amount of Preferred Securities
of such series shall  have such right.  The holders of  a majority in  aggregate
outstanding  principal  amount  of  such series  of  Debentures  may  annul such
declaration and  waive the  default if  the default  has been  cured and  a  sum
sufficient  to  pay  all  matured installments  of  interest  and  principal due
otherwise than by acceleration  and any Additional  Interest has been  deposited
with the Debenture Trustee. (Section 502).
 
    The  holders of a majority in outstanding principal amount of each series of
Debentures may, on behalf of the holders  of all the Debentures of such  series,
waive any past default, except a default in the payment of principal or interest
(unless  such default  has been cured  and a  sum sufficient to  pay all matured
installments of interest and  principal due otherwise  than by acceleration  has
been deposited with the Debenture Trustee) or a default in respect of a covenant
or provision which under the Indenture cannot be modified or amended without the
consent of the holder of each outstanding Debenture of
 
                                       22
<PAGE>
such  series. (Section 513). Western Resources is required to file annually with
the Debenture Trustee a certificate as to whether or not Western Resources is in
compliance with all the material  terms, conditions and covenants applicable  to
it under the Indenture. (Section 1004).
 
    A voluntary or involuntary dissolution of any Issuer prior to the redemption
or  maturity of the Debentures held by  such Issuer will not constitute an Event
of Default with respect to such Debentures. If any Issuer is dissolved, an event
the possibility  of which  Western  Resources and  the  Issuers consider  to  be
remote,   any  of  the  following,  among  other  things,  could  occur:  (i)  a
distribution of  the  Debentures held  by  such Issuer  to  the holders  of  the
corresponding  Preferred Securities, (ii) a cash  distribution to the holders of
such Preferred  Securities out  of the  sale  of assets  of such  Issuer,  after
satisfaction  of all liabilities  to creditors, (iii)  a permitted redemption at
par of the  Debentures, and a  consequent redemption  of a Like  Amount of  such
Preferred Securities, at the option of Western Resources under the circumstances
described  under  "-- Optional  Redemption" or  (iv) the  rollover of  the Trust
Property (as defined in  the Trust Agreement) into  another entity with  similar
characteristics.
 
FORM, EXCHANGE AND TRANSFER
 
    The  Debentures, if  issued in certificated  form, will be  issuable only in
registered form, without coupons and only  in denominations of $25 and  integral
multiples thereof. (Section 302).
 
    Subject  to  the terms  of the  Indenture, Debentures  may be  presented for
registration  of  transfer  or  exchange   (duly  endorsed  or  accompanied   by
satisfactory  instruments of transfer) at the office of the Securities Registrar
or at the office of any transfer agent designated by Western Resources for  such
purpose.  No service  charge will  be made for  any registration  of transfer or
exchange of  Debentures, but  Western Resources  may require  payment of  a  sum
sufficient  to cover any tax or  other governmental charge payable in connection
therewith. Such  transfer  or exchange  will  be effected  upon  the  Securities
Registrar  or such transfer agent, as the  case may be, being satisfied with the
documents of transfer,  title and  identity of  the person  making the  request.
Western  Resources has appointed the Debenture Trustee as the initial Securities
Registrar. (Section 305). Western Resources may at any time designate additional
transfer agents, rescind  the designation  of any  transfer agent  or approve  a
change in the office through which any transfer agent acts. (Section 1002).
 
    If  a series of Debentures is to be redeemed in part, Western Resources will
not be required to issue, register the transfer of or exchange any Debentures of
such series during a period beginning at the opening of business 15 days  before
the  day of mailing of the notice of  redemption for such Debentures that may be
selected for redemption and ending at the  close of business on the day of  such
mailing. (Section 305).
 
PAYMENT AND PAYING AGENTS
 
    Payment of interest on a Debenture on any Interest Payment Date will be made
to  the  Person  in  whose  name such  Debenture  (or  one  or  more predecessor
Debentures) is registered at  the close of business  on the Regular Record  Date
for such interest. (Section 307).
 
    Principal  of and  any interest  on the  Debentures will  be payable  at the
office of such Paying Agent or Paying Agents as Western Resources may  designate
for  such  purpose from  time  to time,  except that  at  the option  of Western
Resources, payment of any interest may be made by check mailed to the address of
the person entitled thereto as such  address appears in the Securities  Register
or  by wire transfer. (Section 101 of the Supplemental Indenture). The corporate
trust office of  the Debenture Trustee  in the City  of Wilmington, Delaware  is
designated  as Western  Resources' initial sole  Paying Agent  for payments with
respect  to  the  Debentures.  Western  Resources  may  at  any  time  designate
additional  Paying  Agents or  rescind the  designation of  any Paying  Agent or
approve a change  in the office  through which any  Paying Agent acts.  (Section
1002).
 
SUPPLEMENTAL INDENTURES, MODIFICATION OF THE INDENTURE
 
    From  time to time Western Resources  and the Debenture Trustee may, without
the consent  of  the  holders of  any  series  of Debentures,  amend,  waive  or
supplement  the Indenture for specified purposes, including, among other things,
curing ambiguities, defects or  inconsistencies, qualifying, or maintaining  the
qualification  of, the  Indenture under the  Trust Indenture Act,  or making any
other change that does not
 
                                       23
<PAGE>
adversely affect the  rights of  any holder  of Debentures.  (Section 901).  The
Indenture will contain provisions permitting Western Resources and the Debenture
Trustee,  with  the  consent of  the  holders of  not  less than  a  majority in
principal amount of any outstanding series of Debentures affected, to modify the
Indenture in a  manner affecting the  rights of  the holders of  such series  of
Debentures;  provided that no such modification  may, without the consent of the
holder of each outstanding Debenture so affected, (i) change the fixed  maturity
of  any series of Debentures, reduce the principal amount thereof, or reduce the
rate or  extend the  time for  payment of  interest thereon  (otherwise than  as
permitted  under the  Indenture), (ii)  reduce the  percentage of  the principal
amount of Debentures of any series, the holders of which are required to consent
to any such modification of the Indenture or (iii) modify certain provisions  of
the  Indenture relating to the waiver of  past defaults or compliance by Western
Resources with certain covenants set forth therein. The Indenture also  requires
the  consent of the holders  of the affected Preferred  Securities in respect of
certain amendments  to  or  termination  of the  Indenture  and  in  respect  to
compliance  by  Western  Resources  with  certain  covenants  in  the Indenture.
(Section 902).  In addition,  Western Resources  and the  Debenture Trustee  may
execute,  without  the  consent  of  any  holders  of  Debentures,  Supplemental
Indentures for the purpose of creating new series of Debentures. (Section 901).
 
CONSOLIDATION, MERGER AND SALE
 
    Western Resources may not consolidate with, merge into, or convey,  transfer
or  lease its properties and assets substantially  as an entirety to, any Person
(a "Successor Person"), and may not permit any Person to merge into, or  convey,
transfer  or lease  its properties  and assets  substantially as  an entirety to
Western Resources, unless: (i) the Successor Person (if any), is a  corporation,
partnership, trust or other entity organized and validly existing under the laws
of  any United States jurisdiction and assumes Western Resources' obligations on
the Debentures, the  Indenture, the  Guarantees and the  Expense Agreements  (as
defined  below); (ii)  immediately after  giving effect  to the  transaction and
treating any indebtedness which  becomes an obligation  of Western Resources  or
any  subsidiary as a result of the transaction  as having been incurred by it at
the time of  the transaction, no  Event of  Default, and no  event which,  after
notice  or lapse of time, would become  an Event of Default, shall have occurred
and be continuing; (iii) such  transaction does not give  rise to any breach  or
violation  of the Trust  Agreement or the Guarantee;  and (iv) Western Resources
has delivered to the Debenture Trustee  an Officers' Certificate and an  Opinion
of Counsel as to certain matters. (Section 801).
 
SATISFACTION AND DISCHARGE
 
    Under  the terms of the Indenture, Western Resources will be discharged from
any and all obligations in respect of a particular series of Debentures (except,
in each case, for  certain obligations to register  the transfer or exchange  of
such Debentures, replace stolen, lost or mutilated Debentures and hold moneys or
U.S.  Government Obligations (as defined in the Indenture) for payment in trust)
if Western Resources deposits  with the Debenture Trustee,  in trust, moneys  or
U.S. Government Obligations in an amount sufficient to pay all the principal of,
and interest on, such series of Debentures on the dates such payments are due in
accordance with the terms of such Debentures. (Section 401).
 
GOVERNING LAW
 
    The  Indenture,  the  Supplemental  Indentures and  the  Debentures  will be
governed by, and  construed in accordance  with, the  laws of the  State of  New
York. (Section 112).
 
MISCELLANEOUS
 
    Western  Resources will  have the right  at all  times to assign  any of its
rights or obligations under the Indenture  to a direct or indirect wholly  owned
subsidiary  of  Western  Resources, provided  that,  in  the event  of  any such
assignment, Western Resources will remain  liable for such obligations.  Subject
to the foregoing, the Indenture will be binding upon and inure to the benefit of
the parties thereto and their respective successors and assigns. (Section 109).
 
                                       24
<PAGE>
                        RELATIONSHIP AMONG THE PREFERRED
                 SECURITIES, THE DEBENTURES AND THE GUARANTEES
 
    As long as payments of interest and other payments are made when due on each
series  of Debentures, such  payments will be  sufficient to cover distributions
and other payments due on the Preferred Securities of the corresponding  series,
because: (i) the aggregate principal amount of each series of Debentures will be
equal to the sum of the aggregate stated Liquidation Amount of the corresponding
Issuer  Securities; (ii) the interest rate  and interest and other payment dates
on each  series of  Debentures  will correspond  to  the distribution  rate  and
distribution and other payment dates on the Preferred Securities of such series;
(iii)  the Expense Agreements entered into  by Western Resources pursuant to the
Trust Agreements provide that Western Resources shall pay for all, and an Issuer
shall not be obligated to pay, directly or indirectly, for any, costs,  expenses
or  liabilities of  such Issuer,  including any  income taxes,  duties and other
governmental charges, and all costs and expenses with respect thereto, to  which
such  Issuer may become subject, except  for United States withholding taxes and
such Issuer's payment obligations  to holders of the  Preferred Securities of  a
particular series under such Preferred Securities; and (iv) each Trust Agreement
further provides that the Trustees shall not cause or permit an Issuer to, among
other  things, engage in  any activity that  is not consistent  with the limited
purposes of each Issuer.
 
    Payments of distributions and other  amounts due on Preferred Securities  of
each  series (to the  extent an Issuer  has funds sufficient  for the payment of
such distributions) are guaranteed by Western Resources as and to the extent set
forth under "Description of the Guarantees."  If and to the extent that  Western
Resources  does not make payments on any  series of Debentures, such Issuer will
not pay distributions or  other amounts due on  the Preferred Securities of  the
corresponding series.
 
    If  the Guarantee  Trustee fails  to enforce  any Guarantee,  a holder  of a
Preferred Security  to  which  such  Guarantee applies  may  institute  a  legal
proceeding  directly against Western  Resources to enforce  such holder's rights
under such Guarantee without  first instituting a  legal proceeding against  the
Issuer of such Preferred Security or any other person or entity.
 
    Each  Issuer's Preferred Securities will evidence  the rights of the holders
thereof to the benefits of such Issuer, a trust that exists for the sole purpose
of issuing its  Issuer Securities and  investing the proceeds  of its  Preferred
Securities  in a corresponding series of  Debentures of Western Resources, while
each series  of  Debentures  represents indebtedness  of  Western  Resources.  A
principal  difference between the rights of a holder of a Preferred Security and
a holder  of a  Debenture is  that  a holder  of a  Debenture will  accrue,  and
(subject  to  the  permissible extensions  of  the interest  payment  period) is
entitled to receive, interest on the principal amount of Debentures held,  while
a  holder of Preferred  Securities is only entitled  to receive distributions if
and to  the extent  the Issuer  has funds  sufficient for  the payment  of  such
distributions.
 
    Upon  any voluntary or involuntary dissolution, winding up or termination of
any Issuer involving the distribution of a series of Debentures, the holders  of
Issuer  Securities of the corresponding series  will be entitled to receive, out
of  assets  legally  available  for  distribution  to  such  holders,  a   Final
Distribution  or a Liquidation Distribution; provided,  however that if an Event
of Default  under an  applicable  Trust Agreement  shall  have occurred  and  be
continuing,  the holders of the Common  Securities shall be entitled to receive,
out of assets legally available for distribution to such holders,  distributions
only   after  the  holders  of   the  corresponding  Preferred  Securities.  See
"Description of  the  Preferred  Securities  --  Liquidation  Distribution  Upon
Dissolution."  Upon any  voluntary or  involuntary liquidation  or bankruptcy of
Western  Resources,  each  Issuer,  as  a  holder  of  Debentures,  would  be  a
subordinated  creditor of Western  Resources, junior in right  of payment to all
Senior Indebtedness, but entitled  to receive payment in  full of principal  and
interest  before any stockholders  of Western Resources  receive any payments or
distributions. Since Western Resources has agreed to pay for all costs, expenses
and liabilities of the Issuers (other  than United States withholding taxes  and
other than the Issuers' obligations to the holders of Preferred Securities under
the  Preferred Securities,  which obligations  are independently  covered by the
 
                                       25
<PAGE>
Guarantees), the positions of a holder  of Preferred Securities and a holder  of
Debentures  relative to other creditors and to stockholders of Western Resources
in the  event of  a liquidation  or  bankruptcy of  Western Resources  would  be
substantially the same.
 
    A  default  or  event of  default  under  any Senior  Indebtedness  will not
constitute a default or Event of  Default under the Debentures. However, in  the
event  of payment defaults  under, or acceleration  of, Senior Indebtedness, the
subordination provisions of the Debentures provide that no payments may be  made
in  respect of the  Debentures until such  Senior Indebtedness has  been paid in
full or any payment default thereunder has been cured or waived.
 
    Failure to  make  required  payments  on  any  series  of  Debentures  would
constitute an Event of Default under the Indenture.
 
                              PLAN OF DISTRIBUTION
 
    The  Preferred Securities  may be  sold in a  public offering  to or through
underwriters or dealers  designated from time  to time. An  Issuer may sell  its
Preferred  Securities  as soon  as practicable  after  the effectiveness  of the
Registration Statement of  which this  Prospectus is a  part. The  names of  any
underwriters  or dealers involved in  the sale of the  Preferred Securities of a
particular series in respect of which  this Prospectus is delivered, the  number
of  Preferred Securities to be purchased by any such underwriters or dealers and
the applicable commissions  or discounts  will be  set forth  in the  applicable
Prospectus Supplement.
 
    Underwriters  may offer  and sell Preferred  Securities at a  fixed price or
prices, which may be changed, or from  time to time at market prices  prevailing
at  the time of sale,  at prices related to such  prevailing market prices or at
negotiated  prices.  In  connection  with  the  sale  of  Preferred  Securities,
underwriters will be deemed to have received compensation from Western Resources
and/or  an  Issuer  in  the  form  of  underwriting  discounts  or  commissions.
Underwriters may  sell Preferred  Securities  to or  through dealers,  and  such
dealers  may  receive  compensation in  the  form of  discounts,  concessions or
commissions from the underwriters.
 
    Any underwriting compensation paid by  Western Resources to underwriters  in
connection  with the  offering of the  Preferred Securities,  and any discounts,
concessions  or  commissions  allowed  by  such  underwriters  to  participating
dealers, will be set forth in the applicable Prospectus Supplement. Underwriters
and  dealers participating  in the distribution  of Preferred  Securities may be
deemed to be underwriters, and any  discounts and commissions received by  them,
and  any profit realized by them on  resale of such Preferred Securities, may be
deemed to constitute underwriting discounts and commissions under the Securities
Act. Underwriters and dealers may be entitled, pursuant to their agreement  with
Western  Resources and  an Issuer,  to indemnification  against and contribution
toward certain  civil liabilities,  including liabilities  under the  Securities
Act, and to reimbursement by Western Resources for certain expenses.
 
    In  connection with the offering of the Preferred Securities of a particular
series, the Issuer thereof may grant  to the underwriters an option to  purchase
additional Preferred Securities to cover over-allotments, if any, at the initial
public offering price (with an additional underwriting commission), as set forth
in the applicable Prospectus Supplement.
 
    Underwriters  and  dealers  may  engage  in  transactions  with,  or perform
services  for,  Western  Resources,  an  Issuer  and  any  of  their  respective
affiliates.
 
    An  Issuer's Preferred Securities will be a new issue of securities and will
have no  established  trading  market.  Any underwriters  to  whom  an  Issuer's
Preferred  Securities are sold by  such Issuer for public  offering and sale may
make a market in  such Preferred Securities, but  such underwriters will not  be
obligated  to do so  and may discontinue  any market-making at  any time without
notice. Such  Preferred  Securities may  or  may not  be  listed on  a  national
securities  exchange. No assurance  can be given  as to the  liquidity of or the
existence of meaningful trading markets for any Preferred Securities.
 
                                       26
<PAGE>
                                    EXPERTS
 
    The  consolidated  financial  statements   and  schedules  included  in   or
incorporated  by reference in Western Resources' 1994 Annual Report on Form 10-K
have been audited by Arthur Andersen LLP, independent public accountants, as set
forth in its  report. In  that report,  that firm  states that  with respect  to
Kansas   Gas  and  Electric  Company  (a  wholly  owned  subsidiary  of  Western
Resources), its opinion is based on  the report of other public accountants  for
the  year ended  December 31,  1992, namely Deloitte  & Touche  LLP. Since 1993,
Arthur Andersen  LLP has  audited  both Western  Resources  and Kansas  Gas  and
Electric Company. The consolidated financial statements and supporting schedules
referred  to above have been incorporated  herein in reliance upon the authority
of Arthur Andersen LLP as experts in giving said reports.
 
    The financial  statements  and  the related  financial  statement  schedules
incorporated  in  this  Prospectus by  reference  from Kansas  Gas  and Electric
Company's Annual Report on Form 10-K for  the year ended December 31, 1992  have
been  audited by Deloitte & Touche LLP, independent auditors, as stated in their
report, which is incorporated herein by reference, and have been so incorporated
in reliance upon the report of such  firm given upon their authority as  experts
in accounting and auditing.
 
                                 LEGAL MATTERS
 
    Certain  legal matters will be passed upon  for Western Resources by John K.
Rosenberg, Esq.,  Executive  Vice  President  and  General  Counsel  of  Western
Resources,  by Cahill Gordon  & Reindel, a  partnership including a professional
corporation, counsel for Western  Resources, and by  Richards, Layton &  Finger,
special  Delaware counsel to Western Resources  and the Issuers. The validity of
the Preferred Securities will  be passed upon for  the underwriters by Sidley  &
Austin.  Cahill Gordon  & Reindel  and Sidley  & Austin  will not  pass upon the
incorporation of Western  Resources and will  rely upon the  opinion of John  K.
Rosenberg,  Esq. as  to matters  of Kansas  law and  the Public  Utility Holding
Company Act of 1935. At September 30, 1995, Mr. Rosenberg owned directly  and/or
beneficially  2,631 shares  of Common  Stock of  Western Resources  and had been
granted, pursuant to and  subject to the terms  of Western Resources'  Long-Term
Incentive Program, 1,466 performance shares.
 
                                       27
<PAGE>
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    NO  PERSON  HAS BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION OR  TO  MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR  THE
PROSPECTUS,  AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON  AS HAVING BEEN  AUTHORIZED. THIS PROSPECTUS  SUPPLEMENT AND  THE
PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
BUY  ANY  SECURITIES  OTHER THAN  THE  SECURITIES DESCRIBED  IN  THIS PROSPECTUS
SUPPLEMENT OR AN  OFFER TO  SELL OR  THE SOLICITATION OF  AN OFFER  TO BUY  SUCH
SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.
NEITHER  THE DELIVERY  OF THIS PROSPECTUS  SUPPLEMENT OR THE  PROSPECTUS NOR ANY
SALE MADE HEREUNDER  OR THEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE  ANY
IMPLICATION  THAT THERE HAS BEEN  NO CHANGE IN THE  AFFAIRS OF WESTERN RESOURCES
SINCE THE DATE  HEREOF OR THAT  THE INFORMATION CONTAINED  HEREIN OR THEREIN  IS
CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.
 
                                 --------------
 
                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                         PAGE
                                                       ---------
<S>                                                    <C>
Prospectus Summary...................................        S-3
Risk Factors.........................................        S-5
Western Resources Capital II.........................        S-7
Western Resources, Inc...............................        S-8
Coverage Ratios......................................        S-9
Use of Proceeds......................................       S-10
Certain Terms of the Series B Preferred Securities...       S-10
Certain Terms of the Series B Guarantee..............       S-13
Certain Terms of the Series B Debentures.............       S-14
United States Taxation...............................       S-17
Underwriting.........................................       S-20
                     PROSPECTUS
Available Information................................          2
Incorporation of Certain Documents by Reference......          2
The Issuers..........................................          3
Western Resources, Inc...............................          4
Description of the Preferred Securities..............          4
Description of the Guarantees........................         15
Description of the Debentures........................         17
Relationship Among the Preferred Securities, the
 Debentures and the Guarantees.......................         25
Plan of Distribution.................................         26
Experts..............................................         27
Legal Matters........................................         27
</TABLE>
 
                                   4,800,000
                              PREFERRED SECURITIES
 
                               WESTERN RESOURCES
                                   CAPITAL II
 
                            (LIQUIDATION AMOUNT $25
                            PER PREFERRED SECURITY)
 
                              % CUMULATIVE QUARTERLY
                                INCOME PREFERRED
                              SECURITIES, SERIES B
 
                            GUARANTEED TO THE EXTENT
                           THAT THE ISSUER HAS FUNDS
                             AS SET FORTH HEREIN BY
 
                            WESTERN RESOURCES, INC.
 
                                  -----------
 
                                     [LOGO]
 
                                  -----------
 
                              GOLDMAN, SACHS & CO.
 
                               SMITH BARNEY INC.
 
                            BEAR, STEARNS & CO. INC.
 
                            DILLON, READ & CO. INC.
 
                             PRUDENTIAL SECURITIES
                                  INCORPORATED
 
                            EVEREN SECURITIES, INC.
 
                      REPRESENTATIVES OF THE UNDERWRITERS
 
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