INTERSTATE ENERGY CORP
8-A12B, 1999-01-20
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                            -------------------------

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                          Interstate Energy Corporation
             (Exact name of registrant as specified in its charter)


               Wisconsin                            39-1380265
       (State of incorporation                    (IRS Employer
          or organization)                     Identification No.)


  222 West Washington Avenue, Madison, Wisconsin         53703
     (Address of principal executive offices)          (Zip Code)


Securities to be registered pursuant to Section 12(b) of the Act:

Title of each  class to                      Name of each  exchange  on which 
be so  registered                            each class is to be registered
- ----------------------------                 --------------------------------
Common Share Purchase Rights                 New York Stock Exchange



If this Form relates to the  registration  of a class of securities  pursuant to
Section  12(b)  of  the  Exchange  Act  and is  effective  pursuant  to  General
Instruction A.(c), please check the following box. [X]

If this Form relates to the  registration  of a class of securities  pursuant to
Section  12(g)  of  the  Exchange  Act  and is  effective  pursuant  to  General
Instruction A.(d), please check the following box. [ ]

Securities  Act  registration  statement file number to which this form relates:
Not applicable

Securities to be registered pursuant to Section 12(g) of the Act:

                                      None


<PAGE>


Item 1.   Description of Registrant's Securities to be Registered.

          On January 20,  1999,  the Board of  Directors  of  Interstate  Energy
Corporation  (the  "Company")  declared a dividend of one common share  purchase
right (a "Right") for each outstanding share of common stock, $.01 par value, of
the Company  (the  "Common  Shares").  The dividend is payable upon the close of
business on February  22,  1999 to the  shareowners  of record on that date (the
"Record Date").  Each Right entitles the registered  holder to purchase from the
Company  one-half  of one Common  Share,  at a price of $95.00 per Common  Share
(equivalent  to  $47.50  for  each  one-half  of a  Common  Share),  subject  to
adjustment (the "Purchase  Price").  The description and terms of the Rights are
set forth in a Rights Agreement dated January 20, 1999 (the "Rights Agreement"),
between  the Company and Firstar  Bank  Milwaukee,  N. A., as Rights  Agent (the
"Rights Agent").

          Until  the  earlier  to  occur  of  (i) 10  days  following  a  public
announcement  that a person or group of affiliated or associated  persons (other
than the Company,  a subsidiary of the Company,  an employee benefit plan of the
Company  or a  subsidiary)  (an  "Acquiring  Person")  has  acquired  beneficial
ownership  of  15% or  more  of  the  outstanding  Common  Shares  (the  "Shares
Acquisition  Date")  or (ii) 10  business  days  (or such  later  date as may be
determined by action of the Company's  Board of Directors  prior to such time as
any person  becomes an  Acquiring  Person)  following  the  commencement  of, or
announcement  of an  intention  to make,  a tender  offer or exchange  offer the
consummation  of which would result in the  beneficial  ownership by a person or
group  (other  than the  Company,  a  subsidiary  of the  Company or an employee
benefit plan of the Company or a subsidiary) of 15% or more of such  outstanding
Common Shares (the earlier of such dates being called the "Distribution  Date"),
the  Rights  will  be  evidenced,  with  respect  to  any of  the  Common  Share
certificates   outstanding   as  of  the  Record  Date,  by  such  Common  Share
certificate.

          The Rights Agreement  provides that, until the Distribution  Date, the
Rights  will be  transferred  with and only with the  Common  Shares.  Until the
Distribution  Date (or earlier  redemption  or  expiration  of the Rights),  new
Common Share  certificates  issued after the Record Date,  upon  transfer or new
issuance of Common  Shares,  will  contain a notation  incorporating  the Rights
Agreement by reference.  Until the Distribution  Date (or earlier  redemption or
expiration of the Rights),  the surrender for transfer of any  certificates  for
Common Shares,  outstanding  as of the Record Date,  even without such notation,
will also  constitute  the  transfer  of the Rights  associated  with the Common
Shares  represented by such  certificate.  As soon as practicable  following the
Distribution  Date,   separate   certificates   evidencing  the  Rights  ("Right
Certificates")  will be mailed to holders  of record of the Common  Shares as of
the  close  of  business  on the  Distribution  Date  and  such  separate  Right
Certificates alone will evidence the Rights.

          The Rights are not exercisable  until the  Distribution  Date. No less
than two Rights,  and only integral multiples of two Rights, may be exercised at
any one time by any holder of Rights. The Rights will expire on January 20, 2009
(the  "Final  Expiration  Date"),  unless  the Rights are  earlier  redeemed  or
exchanged  by the  Company,  or the  Rights  Plan is  amended,  in each  case as
described below.

          The Purchase Price  payable,  and the number of Common Shares or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from time to time to  prevent  dilution  (i) in the event of a stock
dividend on, or a subdivision,  combination or  reclassification  of, the Common
Shares; (ii) upon the grant to holders of the Common Shares of certain rights or
warrants to subscribe for or purchase  Common  Shares at a price,  or securities
convertible  into Common  Shares  with a  conversion  price,  less than the then
current market price of the Common  Shares;  or (iii) upon 

                                      -2-

<PAGE>


the distribution to holders of the Common Shares of evidences of indebtedness or
assets  (excluding  regular  quarterly  cash  dividends or dividends  payable in
Common Shares) or of subscription  rights or warrants (other than those referred
to above).

          The  number of  outstanding  Rights  and the  number of Common  Shares
issuable upon exercise of each Right are also subject to adjustment in the event
of a stock split of the Common  Shares or a stock  dividend on the Common Shares
payable in Common Shares or subdivisions,  consolidations or combinations of the
Common Shares occurring, in any such case, prior to the Distribution Date.

          In the event that any person  becomes an Acquiring  Person (a "Flip-In
Event"),  holders of Rights will thereafter  generally have the right to receive
upon exercise that number of Common Shares (or, in certain  circumstances  cash,
property  or other  securities  of the Company or a  reduction  in the  Purchase
Price)  having a market  value of two times  the then  current  Purchase  Price.
Notwithstanding  any of the  foregoing,  following  the  occurrence of a Flip-In
Event all Rights  that are, or (under  certain  circumstances  specified  in the
Rights  Agreement)  were,  or  subsequently  become  beneficially  owned  by  an
Acquiring Person, related persons and transferees will be null and void.

          In the event that, at any time following the Shares  Acquisition Date,
(i)  the  Company  is  acquired  in  a  merger  or  other  business  combination
transaction or (ii) 50% or more of its consolidated  assets or earning power are
sold (the events  described  in clauses  (i) and (ii) are herein  referred to as
"Flip-Over  Events"),  proper  provision  will be made so that holders of Rights
will (subject to the limitations set forth in the Rights  Agreement)  thereafter
have the  right  to  receive,  upon the  exercise  thereof  at the then  current
Purchase Price,  that number of shares of common stock of the acquiring  company
which at the time of such  transaction will have a market value of two times the
then current Purchase Price.

          With certain  exceptions,  no adjustment in the Purchase Price will be
required until  cumulative  adjustments  require an adjustment of at least 1% in
such  Purchase  Price.  No fractional  Common Shares will be issued.  In lieu of
fractional  Common  Shares  equal  to  one-half  of a Common  Share or less,  an
adjustment  in cash will be made based on the market price of the Common  Shares
on the last  trading  day  prior  to the  date of  exercise.  No  Rights  may be
exercised that would entitle the holder  thereof to any fractional  Common Share
greater  than  one-half of a Common  Share unless  concurrently  therewith  such
holder purchases an additional  fraction of a Common Share,  which when added to
the  number  of Common  Shares to be  received  upon  such  exercise,  equals an
integral number of Common Shares.

          The Purchase  Price is payable by certified  check,  cashier's  check,
bank draft or money order or, if so provided by the Company,  the Purchase Price
following the occurrence of a Flip-In Event and until the first  occurrence of a
Flip-Over Event may be paid in Common Shares having an equivalent value.

          At any time after a person  becomes an  Acquiring  Person and prior to
the acquisition by any Acquiring Person of 50% or more of the outstanding Common
Shares,  the Board of Directors  of the Company may  exchange the Rights  (other
than Rights owned by any Acquiring  Person which have become void),  in whole or
in part,  at an  exchange  ratio of one  Common  Share  per  Right  (subject  to
adjustment).

          At any time prior to a person becoming an Acquiring Person,  the Board
of Directors of the Company may redeem the Rights in whole,  but not in part, at
a price of $.001 per Right  (the  

                                      -3-


<PAGE>



"Redemption  Price"). The redemption of the Rights may be made effective at such
time,  on such basis and with such  conditions  as the Board of Directors in its
sole  discretion may establish.  Immediately  upon any redemption of the Rights,
the right to  exercise  the  Rights  will  terminate  and the only  right of the
holders of Rights will be to receive the Redemption Price.

          Other than  provisions  relating to certain of the principal  economic
terms of the  Rights,  the terms of the  Rights  may be  amended by the Board of
Directors  of the  Company  without  the  consent of the  holders of the Rights,
including an amendment to lower the threshold for  exercisability  of the Rights
from 15% to not less than 10%, with  appropriate  exceptions for any person then
beneficially owning a percentage of the number of Common Shares then outstanding
equal to or in  excess  of the new  threshold,  except  that  from and after the
Distribution  Date no such  amendment may adversely  affect the interests of the
holders of the Rights.  The Rights may also be amended to extend the  expiration
date thereof.

          Until a Right is exercised,  the holder thereof, as such, will have no
rights as a shareowner of the Company, including,  without limitation, the right
to vote or to receive dividends.

          As of January 14, 1999, there were 77,630,043 Common Shares issued and
outstanding  (and 7,156,820  Common Shares  reserved for issuance  (exclusive of
shares reserved for issuance pursuant to the Company's Rights  Agreement,  dated
February  22,  1989)).  Each  outstanding  Common  Share on the Record Date will
receive one Right. As long as the Rights are attached to the Common Shares,  the
Company  will issue one Right for each Common  Share which  becomes  outstanding
between the Record Date and the  Distribution  Date so that all such shares will
have attached Rights.

          The Rights have certain  anti-takeover  effects. The Rights will cause
substantial  dilution to a person or group that  attempts to acquire the Company
without  conditioning  the offer on redemption of the Rights or on a substantial
number of Rights being acquired. The Rights should not interfere with any merger
or other business  combination approved by the Board of Directors of the Company
prior to the time that the Rights may not be redeemed (as described above) since
the  Board of  Directors  may,  at its  option,  at any time  until  the  Shares
Acquisition Date redeem all but not less than all the then outstanding Rights at
$.001 per Right.  The  Rights are  designed  to  provide  additional  protection
against abusive takeover tactics such as offers for all shares at less than full
value or at an inappropriate time (in terms of maximizing  long-term  shareowner
value),  partial tender offers and selective open-market  purchases.  The Rights
are intended to assure that the Company's  Board of Directors has the ability to
protect  shareowners  and the Company if efforts are made to gain control of the
Company in a manner  that is not in the best  interests  of the  Company and its
shareowners.

          The  Rights  Agreement  between  the  Company  and  the  Rights  Agent
specifying  the terms of the  Rights,  which  includes  as Exhibit A the Form of
Right Certificate,  is attached hereto as an exhibit. The foregoing  description
of the Rights does not purport to be complete  and is  qualified in its entirety
by reference to such exhibit.

                                      -4-

<PAGE>


Item 2.            Exhibits.

         (4.1)    Rights  Agreement,  dated  as of  January  20,  1999,  between
                  Interstate Energy  Corporation and Firstar Bank Milwaukee,  N.
                  A.,  which  includes  as  Exhibit A thereto  the Form of Right
                  Certificate  and as Exhibit B thereto the Summary of Rights to
                  Purchase Common Shares.

                  All exhibits  required by the  instructions  to Item 2 will be
                  supplied to the New York Stock Exchange.






                                      -5-

<PAGE>


                                    SIGNATURE

          Pursuant to the requirements of Section 12 of the Securities  Exchange
Act of 1934, the registrant  has duly caused this  registration  statement to be
signed on its behalf by the undersigned, thereto duly authorized.

                                INTERSTATE ENERGY CORPORATION


Date:  January 20, 1999         By:  /s/ Edward M. Gleason
                                     ----------------------------------------
                                      Edward M. Gleason
                                      Vice President, Treasurer and Corporate
                                       Secretary




                                      -6-


<PAGE>


                          INTERSTATE ENERGY CORPORATION
                                    FORM 8-A
                                  EXHIBIT INDEX


Exhibit                            Description
Number

(4.1)     Rights  Agreement,  dated as of January 20, 1999,  between  Interstate
          Energy  Corporation and Firstar Bank Milwaukee,  N. A., which includes
          as Exhibit A thereto  the Form of Right  Certificate  and as Exhibit B
          thereto the Summary of Rights to Purchase Common Shares.




                                      -7-




                          INTERSTATE ENERGY CORPORATION

                                       and


                          FIRSTAR BANK MILWAUKEE, N. A.

                                  Rights Agent

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

                                RIGHTS AGREEMENT

                          Dated as of January 20, 1999


<PAGE>




                                TABLE OF CONTENTS

Section 1.        Certain Definitions..........................................1

Section 2.        Appointment of Rights Agent..................................4

Section 3.        Issue of Right Certificates..................................4

Section 4.        Form of Right Certificates...................................5

Section 5.        Countersignature and Registration............................6

Section 6.        Transfer, Split Up, Combination and Exchange 
                  of Right Certificates; Mutilated, Destroyed, Lost
                  or Stolen Right Certificates.................................6

Section 7.        Exercise of Rights; Purchase Price; Expiration 
                  Date of Rights...............................................7

Section 8.        Cancellation and Destruction of Right Certificates...........8

Section 9.        Reservation and Availability of Common Shares................9

Section 10.       Common Shares Record Date....................................9

Section 11.       Adjustment of Purchase Price, Number of Shares 
                  or Number of Rights.........................................10

Section 12.       Certificate of Adjusted Purchase Price or 
                  Number of Shares............................................16

Section 13.       Consolidation, Merger, Share Exchange or Sale 
                  or Transfer of Assets or Earning Power......................16

Section 14.       Fractional Rights and Fractional Shares.....................19

Section 15.       Rights of Action............................................20

Section 16.       Agreement of Right Holders..................................20

Section 17.       Right Certificate Holder Not Deemed a Shareowner............21

Section 18.       Concerning the Rights Agent.................................21

Section 19.       Merger or Consolidation or Change of Name of 
                  Rights Agent................................................21

Section 20.       Duties of Rights Agent......................................22

Section 21.       Change of Rights Agent......................................24

Section 22.       Issuance of New Right Certificates..........................24

                                      -i-

<PAGE>

Section 23.       Redemption..................................................25

Section 24.       Exchange....................................................25

Section 25.       Notice of Certain Events....................................27

Section 26.       Notices.....................................................27

Section 27.       Supplements and Amendments..................................28

Section 28.       Successors..................................................28

Section 29.       Benefits of this Agreement..................................29

Section 30.       Severability................................................29

Section 31.       Governing Law...............................................29

Section 32.       Counterparts................................................29

Section 33.       Descriptive Headings........................................29

Section 34.       Determinations and Actions by the Board of Directors........29



Exhibit A  -  Form of Right Certificate

Exhibit B  -  Summary of Rights to Purchase Common Shares


                                      -ii-

<PAGE>




                                RIGHTS AGREEMENT

          THIS  AGREEMENT,  dated as of January  20,  1999,  between  INTERSTATE
ENERGY CORPORATION,  a Wisconsin  corporation (the "Company"),  and FIRSTAR BANK
MILWAUKEE, N. A., a national banking association (the "Rights Agent").

          WHEREAS,  the Board of Directors of the Company  authorized the Rights
Agreement,  dated as of February  22, 1989 (the "1989  Agreement"),  between the
Company and Morgan  Shareholder  Services Trust Company,  declared a dividend of
one common  share  purchase  right (a "1989  Right") for each  Common  Share (as
hereinafter  defined)  of the  Company  outstanding  on March 6, 1989 (the "1989
Record  Date"),  and  authorized  the issuance of one 1989 Right for each Common
Share issued  between the 1989 Record Date and the earliest of the  Distribution
Date,  the  Redemption  Date and the Final  Expiration  Date (as such  terms are
defined  in the 1989  Agreement),  each  1989  Right  representing  the right to
purchase one-half of one Common Share of the Company, upon the terms and subject
to the conditions set forth in the 1989 Agreement;

          WHEREAS,  the Board of Directors of the Company has  determined  it is
desirable and in the best interests of the Company and its  shareowners  for the
Company to extend the benefits  afforded by the 1989  Agreement and to implement
such extension by execution of this Agreement;

          WHEREAS,  the Board of  Directors  of the Company has  authorized  and
declared a dividend of one common  share  purchase  right (a  "Right")  for each
Common Share of the Company  outstanding  upon the close of business on February
22, 1999 (the "Record Date") payable on such date (the "Payment Date"),  and has
authorized  and  directed  the issuance of one Right with respect to each Common
Share that shall become outstanding  between the Record Date and the earliest of
the  Distribution  Date, the Redemption  Date and the Final  Expiration Date (as
such  terms are  hereinafter  defined),  each  Right  representing  the right to
purchase  one-half of one Common Share of the Company upon the terms and subject
to the conditions hereinafter set forth;

          NOW,  THEREFORE,  in  consideration  of the  premises  and the  mutual
agreements herein set forth, the parties hereby agree as follows:


          Section 1. Certain  Definitions.  For purposes of this Agreement,  the
following terms have the meanings indicated:

          (a)  "Acquiring  Person"  shall  mean  any  Person  (as  such  term is
hereinafter  defined) who or which,  together with all Affiliates and Associates
(as such terms are hereinafter  defined) of such Person, shall be the Beneficial
Owner (as such term is hereinafter  defined) of 15% or more of the Common Shares
of the  Company  then  outstanding,  but  shall not  include  the  Company,  any
Subsidiary  (as such term is hereinafter  defined) of the Company,  any employee
benefit plan of the Company or any Subsidiary of the Company, any entity holding
Common  Shares for or  pursuant to the terms of any such plan,  or any  trustee,
administrator  or fiduciary of such a plan.  Notwithstanding  the foregoing,  no
Person  shall  become an  "Acquiring  Person" as a result of an  acquisition  of
Common  Shares  by  the  Company  which,   by  reducing  the  number  of  shares
outstanding,  increases the proportionate number of shares beneficially owned by
such Person to 15% or more of the Common Shares of the Company then outstanding;
provided, however, that 



<PAGE>

if a Person would,  but for the foregoing,  become an Acquiring Person by reason
of share  purchases by the Company and shall,  after such share purchases by the
Company,  become the  Beneficial  Owner of any  additional  Common Shares of the
Company at any time that the Person is or thereby  becomes the Beneficial  Owner
of 15% or more of the Common Shares of the Company then outstanding  (other than
Common Shares acquired solely as a result of corporate action of the Company not
caused,  directly or  indirectly,  by such  Person),  then such Person  shall be
deemed to be an "Acquiring Person".  Notwithstanding the foregoing, if the Board
of  Directors  of the Company  determines  in good faith that a Person who would
otherwise  be an  "Acquiring  Person",  as  defined  pursuant  to the  foregoing
provisions of this paragraph (a), has become such inadvertently, and such Person
divests as promptly as practicable a sufficient  number of Common Shares so that
such Person would no longer be an "Acquiring Person," as defined pursuant to the
foregoing provisions of this paragraph (a), then such Person shall not be deemed
to be an "Acquiring Person" for any purposes of this Agreement.

          (b)  "Affiliate" and  "Associate"  shall have the respective  meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations  under
the  Securities  Exchange Act of 1934, as amended (the  "Exchange  Act"),  as in
effect on the date of this Agreement.

          (c) A Person  shall be deemed the  "Beneficial  Owner" of and shall be
deemed to "beneficially own" any securities:

                (i) which such Person or any of such Person's  Affiliates or
      Associates beneficially owns, directly or indirectly;

                (ii) which such Person or any of such Person's Affiliates or
      Associates  has (A) the  right  to  acquire  (whether  such  right  is
      exercisable immediately or only after the passage of time) pursuant to
      any  agreement,  arrangement  or  understanding  (other than customary
      agreements  with and between  underwriters  and selling  group members
      with respect to a bona fide public  offering of  securities),  or upon
      the exercise of conversion rights, exchange rights, rights (other than
      these Rights), warrants or options, or otherwise;  provided,  however,
      that a Person  shall  not be  deemed  the  Beneficial  Owner of, or to
      beneficially own, securities tendered pursuant to a tender or exchange
      offer  made by or on  behalf of such  Person  or any of such  Person's
      Affiliates or Associates  until such tendered  securities are accepted
      for  purchase or  exchange;  or (B) the right to vote  pursuant to any
      agreement,  arrangement or understanding;  provided,  however,  that a
      Person shall not be deemed the Beneficial Owner of, or to beneficially
      own, any security if the agreement,  arrangement or  understanding  to
      vote such security (1) arises solely from a revocable proxy or consent
      given  to such  Person  in  response  to a  public  proxy  or  consent
      solicitation  made pursuant to, and in accordance with, the applicable
      rules and  regulations  of the  Exchange  Act and (2) is not also then
      reportable  on Schedule 13D under the Exchange Act (or any  comparable
      or successor report); or

                                       2

<PAGE>

                (iii) which are beneficially  owned,  directly or indirectly,
       by any other  Person  with which such  Person or any of such  Person's
       Affiliates   or  Associates   has  any   agreement,   arrangement   or
       understanding  (other  than  customary  agreements  with  and  between
       underwriters  and selling  group  members  with respect to a bona fide
       public offering of securities) for the purpose of, or with respect to,
       acquiring,  holding,  voting (except to the extent contemplated by the
       proviso to Section  1(c)(ii)(B)) or disposing of any securities of the
       Company.

          Notwithstanding anything in this definition of Beneficial Ownership to
the  contrary,  the phrase  "then  outstanding,"  when used with  reference to a
Person's  Beneficial  Ownership of  securities  of the  Company,  shall mean the
number of such securities  then issued and outstanding  together with the number
of such securities not then actually  issued and  outstanding  which such Person
would be deemed to own beneficially hereunder.

          (d) "Business Day" shall mean any day other than a Saturday,  a Sunday
or a day on which banking  institutions in the State of Wisconsin are authorized
or obligated by law or executive order to close.

          (e)  "Close of  business"  on any given  date  shall  mean 5:00  P.M.,
Madison,  Wisconsin time, on such date; provided,  however, that if such date is
not a Business Day it shall mean 5:00 P.M., Madison, Wisconsin time, on the next
succeeding Business Day.

          (f) "Common Shares" when used with reference to the Company shall mean
the shares of common  stock,  par value $.01,  of the Company,  or shares having
equivalent rights,  privileges and preferences to common stock.  "Common Shares"
when used with  reference  to any Person  other than the Company  shall mean the
capital stock (or equivalent  equity interest) with the greatest voting power of
such other Person or, if such other Person is a  Subsidiary  of another  Person,
the Person or Persons which ultimately control such first-mentioned Person.

          (g)  "Distribution  Date"  shall have the meaning set forth in Section
3(a) hereof.

          (h)  "Final  Expiration  Date"  shall  have the  meaning  set forth in
Section 7 hereof.

          (i) "Person"  shall mean any  individual,  firm,  corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

          (j)  "Redemption  Date"  shall have the meaning set forth in Section 7
hereof.

          (k)  "Shares  Acquisition  Date"  shall  mean the first date of public
announcement  (which,  for purposes of this definition,  shall include,  without
limitation,  a report  filed or  amended  pursuant  to Section  13(d)  under the
Exchange Act) by the Company or an Acquiring Person that an Acquiring Person has
become such.

          (l)  "Subsidiary"  of any Person shall mean any  corporation  or other
entity of which a majority of the voting power of the voting  equity  securities
or equity interest is owned, directly or indirectly, by such Person.

                                       3

<PAGE>

          Section 2.  Appointment of Rights Agent.  The Company hereby  appoints
the Rights  Agent to act as agent for the  Company and the holders of the Rights
(who, in accordance with Section 3 hereof,  shall prior to the Distribution Date
also be the holders of the Common Shares of the Company) in accordance  with the
terms  and  conditions   hereof,  and  the  Rights  Agent  hereby  accepts  such
appointment.  The Company may from time to time appoint such co-Rights Agents as
it may deem necessary or desirable.

          Section 3. Issue of Right Certificates.

          (a)  Until  the  earlier  of  (i)  the  tenth  day  after  the  Shares
Acquisition  Date or (ii) the tenth  Business  Day (or such later date as may be
determined by action of the Company's  Board of Directors  prior to such time as
any Person becomes an Acquiring  Person) after the date of the  commencement of,
or of the first public  announcement of the intention of any Person to commence,
a tender or exchange offer the  consummation of which would result in any Person
(other than the Company,  any  Subsidiary of the Company,  any employee  benefit
plan of the Company or of any  Subsidiary  of the  Company,  any entity  holding
Common  Shares for or  pursuant to the terms of any such plan,  or any  trustee,
administrator,  or fiduciary of such a plan)  becoming the  Beneficial  Owner of
Common  Shares of the Company  aggregating  15% or more of the then  outstanding
Common Shares (including in either case any such date which is after the date of
this  Agreement and prior to the Payment  Date;  the earlier of such dates being
herein referred to as the "Distribution Date";  provided,  however,  that if the
tenth day or Business Day, as the case may be, after the  pertinent  date occurs
before the Record Date, "Distribution Date" shall mean the Record Date), (x) the
Rights will be evidenced  (subject to the  provisions of Section 3(b) hereof) by
the  certificates  for  Common  Shares  registered  in the names of the  holders
thereof (which  certificates shall also be deemed to be Right  Certificates) and
not by  separate  Right  Certificates,  and  (y)  the  right  to  receive  Right
Certificates will be transferable only in connection with the transfer of Common
Shares.  As soon as practicable  after the  Distribution  Date, the Company will
prepare and  execute,  the Rights Agent will  countersign,  and the Company will
send or cause to be sent (and the Rights  Agent  will,  if  requested,  send) by
first-class,  insured,  postage-prepaid  mail,  to each record  holder of Common
Shares as of the close of business on the  Distribution  Date, at the address of
such  holder  shown on the  records  of the  Company,  a Right  Certificate,  in
substantially the form of Exhibit A hereto (a "Right  Certificate"),  evidencing
one Right for each Common Share so held. As of the Distribution Date, the Rights
will be evidenced solely by such Right Certificates.

          (b) On the Payment Date,  or as soon as  practicable  thereafter,  the
Company will send a copy of a Summary of Rights to Purchase  Common  Shares,  in
substantially  the form of  Exhibit  B hereto  (the  "Summary  of  Rights"),  by
first-class,  postage-prepaid mail, to each record holder of Common Shares as of
the close of business on the Record Date, at the address of such holder shown on
the records of the  Company.  With  respect to  certificates  for Common  Shares
outstanding as of the Record Date, until the Distribution  Date, the Rights will
be  evidenced  by such  certificates  registered  in the  names  of the  holders
thereof.  Until the Distribution  Date (or the earlier of the Redemption Date or
Final Expiration Date), the surrender for transfer of any certificate for Common
Shares  outstanding on the Record Date, with or without a copy of the Summary of
Rights  attached  thereto,  shall also  constitute  the  transfer  of the Rights
associated with the Common Shares represented thereby.

                                       4

<PAGE>

          (c)   Certificates   for  Common   Shares  which  become   outstanding
(including,  without  limitation,  certificates  for  reacquired  Common  Shares
referred to in the last sentence of this paragraph (c) and  certificates  issued
on the  transfer  of  Common  Shares)  after  the  Record  Date but prior to the
earliest of the  Distribution  Date, the Redemption Date or the Final Expiration
Date shall have  impressed on,  printed on,  written on or otherwise  affixed to
them a legend in  substantially  the following  form  (provided,  however,  that
certificates  for Common  Shares in  existence  on the Record  Date may bear the
legend required by the Company's predecessor rights agreement):


              This certificate also evidences and entitles the holder hereof
     to certain rights as set forth in a Rights Agreement between Interstate
     Energy  Corporation  and Firstar  Bank  Milwaukee,  N. A.,  dated as of
     January 20,  1999,  and as such  agreement  may be amended (the "Rights
     Agreement"),  the  terms of which  are  hereby  incorporated  herein by
     reference  and a copy of  which is on file at the  principal  executive
     offices of Interstate Energy Corporation.  Under certain circumstances,
     as set forth in the Rights Agreement,  such Rights will be evidenced by
     separate   certificates  and  will  no  longer  be  evidenced  by  this
     certificate.  Interstate Energy  Corporation will mail to the holder of
     this  certificate a copy of the Rights  Agreement  without charge after
     receipt of a written request therefor.  Under certain circumstances set
     forth in the  Rights  Agreement,  Rights  issued  to,  or held  by,  an
     Acquiring  Person or any Affiliate or Associate  thereof (as such terms
     are defined in the Rights  Agreement),  whether  held by such person or
     any subsequent holder, shall become null and void.

With respect to such  certificates  containing the foregoing  legend,  until the
Distribution  Date, the Rights associated with the Common Shares  represented by
such  certificates  shall  be  evidenced  by such  certificates  alone,  and the
surrender  for  transfer  of any such  certificate  shall  also  constitute  the
transfer of the Rights associated with the Common Shares represented thereby. In
the event that the Company  purchases  or acquires  any Common  Shares after the
Record Date but prior to the Distribution  Date, any Rights associated with such
Common  Shares shall be deemed  cancelled  and retired so that the Company shall
not be entitled to exercise any Rights  associated  with the Common Shares which
are no longer outstanding.

          Section 4. Form of Right Certificates. The Right Certificates (and the
forms of election to purchase  Common  Shares and of assignment to be printed on
the reverse thereof) shall be substantially the same as Exhibit A hereto and may
have such marks of identification or designation and such legends,  summaries or
endorsements  printed thereon as the Company may deem appropriate and as are not
inconsistent  with the  provisions of this  Agreement,  or as may be required to
comply with any  applicable  law or with any rule or  regulation  made  pursuant
thereto or with any rule or regulation of any stock exchange on which the Rights
may  from  time to time be  listed,  or to  conform  to  usage.  Subject  to the
provisions  of Section 22  hereof,  the Right  Certificates  shall  entitle  the
holders  thereof to purchase  such number of Common Shares as shall be set forth
therein at the price per Common Share set forth therein (the "Purchase  Price"),
but the amount and type of  securities  purchasable  upon exercise of each Right
and the Purchase Price shall be subject to adjustment as provided herein.

                                       5


<PAGE>

          Section 5. Countersignature and Registration.

          (a) The Right  Certificates shall be executed on behalf of the Company
by its Chairman of the Board,  Chief  Executive  Officer,  President or any Vice
President either manually or by facsimile signature,  shall have affixed thereto
the  Company's  seal or a  facsimile  thereof,  and  shall  be  attested  by the
Treasurer,  an  Assistant  Treasurer,  the  Corporate  Secretary or an Assistant
Corporate Secretary of the Company,  either manually or by facsimile  signature.
The Right Certificates  shall be manually  countersigned by the Rights Agent and
shall not be valid for any purpose unless countersigned.  In case any officer of
the Company who shall have signed any of the Right  Certificates  shall cease to
be such officer of the Company before  countersignature  by the Rights Agent and
issuance and delivery by the Company, such Right Certificates, nevertheless, may
be  countersigned  by the Rights  Agent and issued and  delivered by the Company
with the same  force and  effect as though  the  person  who  signed  such Right
Certificates  had not ceased to be such  officer of the  Company;  and any Right
Certificate  may be signed on behalf of the  Company by any person  who,  at the
actual  date of the  execution  of such  Right  Certificate,  shall  be a proper
officer of the Company to sign such Right  Certificate,  although at the date of
the execution of this Rights Agreement any such person was not such an officer.

          (b) Following  the  Distribution  Date,  the Rights Agent will keep or
cause to be kept, at its principal  office,  books for registration and transfer
of the Right Certificates issued hereunder.  Such books shall show the names and
addresses of the  respective  holders of the Right  Certificates,  the number of
Rights  evidenced on its face by each of the Right  Certificates and the date of
each of the Right Certificates.

          Section  6. Transfer,  Split Up,  Combination  and  Exchange  of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates.

          (a) Subject to the provisions of Section 14 hereof,  at any time after
the close of business on the Distribution  Date, and at or prior to the close of
business on the earlier of the Redemption Date or the Final Expiration Date, any
Right  Certificate  or  Right   Certificates   (other  than  Right  Certificates
representing  Rights that have become void pursuant to Section  11(a)(ii) hereof
or that have been exchanged  pursuant to Section 24 hereof) may be  transferred,
split  up,  combined  or  exchanged  for  another  Right  Certificate  or  Right
Certificates,  entitling  the  registered  holder to  purchase a like  number of
Common Shares as the Right  Certificate or Right  Certificates  surrendered then
entitled such holder to purchase.  Any registered  holder  desiring to transfer,
split up, combine or exchange any Right Certificate or Right  Certificates shall
make such request in writing  delivered to the Rights Agent, and shall surrender
the  Right  Certificate  or Right  Certificates  to be  transferred,  split  up,
combined or exchanged at the principal office of the Rights Agent. Thereupon the
Rights  Agent shall  countersign  and deliver to the person  entitled  thereto a
Right  Certificate or Right  Certificates,  as the case may be, as so requested.
The  Company  may  require  payment  of a sum  sufficient  to  cover  any tax or
governmental  charge that may be imposed in connection with any transfer,  split
up, combination or exchange of Right Certificates.

                                       6

<PAGE>

          (b) Upon  receipt  by the  Company  and the Rights  Agent of  evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Right Certificate and, in case of loss, theft or destruction,  of indemnity or
security  reasonably  satisfactory  to  them,  and,  at the  Company's  request,
reimbursement  to the Company and the Rights  Agent of all  reasonable  expenses
incidental  thereto,  and upon surrender to the Rights Agent and cancellation of
the Right  Certificate  if  mutilated,  the Company  will make and deliver a new
Right  Certificate  of like  tenor  to the  Rights  Agent  for  delivery  to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed or
mutilated.

          Section 7. Exercise  of Rights;  Purchase  Price;  Expiration  Date of
Rights.

          (a) Each Right shall be exercisable to purchase one-half of one Common
Share,  subject to further  adjustment as provided herein. The registered holder
of any Right  Certificate may exercise the Rights  evidenced  thereby (except as
otherwise  provided  herein)  in  whole  or  in  part  at  any  time  after  the
Distribution  Date upon  surrender  of the Right  Certificate,  with the form of
election to purchase on the reverse side thereof  duly  executed,  to the Rights
Agent at the principal office of the Rights Agent,  together with payment of the
Purchase Price for each Common Share as to which the Rights are exercised, at or
prior to the earliest of (i) the close of business on January 20, 2009,  subject
to extension (the "Final  Expiration  Date"),  (ii) the time at which the Rights
are redeemed as provided in Section 23 hereof (the "Redemption Date"), and (iii)
the time at which such  Rights are  exchanged  as provided in Section 24 hereof;
provided,  however, that no less than two Rights, and only integral multiples of
two  Rights,  may be  exercised  at any time by such  registered  holders;  and,
provided  further,  that if the number of Rights  exercised  would  entitle  the
holder  thereof to receive any fraction of a Common Share  greater than one-half
of a Common  Share,  then the holder  thereof  shall not be entitled to exercise
such Rights unless such holder  concurrently  purchases from the Company (and in
such event the Company shall sell to such  holder),  at a price in proportion to
the Purchase Price, an additional  fraction of a Common Share which,  when added
to the number of Common Shares to be received upon such exercise,  will equal an
integral number of Common Shares.

          (b) The  Purchase  Price for each full  Common  Share  pursuant to the
exercise of Rights  shall  initially  be $95.00  (equivalent  to $47.50 for each
one-half of one Common Share),  shall be subject to adjustment from time to time
as provided in Sections 11 and 13 hereof and shall be payable in lawful money of
the United States of America in accordance with paragraph (c) below.

          (c)  Upon  receipt  of a Right  Certificate  representing  exercisable
Rights,  with the form of election to purchase  duly  executed,  accompanied  by
payment of the  Purchase  Price for the  Common  Shares to be  purchased  and an
amount equal to any applicable transfer tax required to be paid by the holder of
such Right  Certificate in accordance with Section 9 hereof, as set forth below,
the Rights  Agent shall  thereupon  promptly (i)  requisition  from any transfer
agent of the Common  Shares  certificates  for the number of Common Shares to be
purchased and the Company  hereby  irrevocably  authorizes its transfer agent to
comply  with all such  requests,  (ii) when  appropriate,  requisition  from the
Company the amount of cash to be paid in lieu of issuance of  fractional  Common
Shares in  accordance  with  Section  14  hereof,  (iii)  after  receipt of such
certificates,  cause  

                                       7

<PAGE>

the same to be delivered to or upon the order of the  registered  holder of such
Right Certificate, registered in such name or names as may be designated by such
holder and (iv) when  appropriate,  after receipt,  deliver such cash to or upon
the order of the registered holder of such Right Certificate. The payment of the
Purchase  Price (as such amount may be reduced  pursuant  to Section  11(a)(iii)
hereof) shall be made by certified check,  cashier's check,  bank draft or money
order  payable to the order of the Company,  except that,  if so provided by the
Board of Directors of the Company,  the payment of the Purchase Price  following
the occurrence of a Section  11(a)(ii) Event (as hereinafter  defined) and until
the first occurrence of a Section 13 Event (as hereinafter  defined) may be made
wholly or in part by delivery of a certificate or certificates (with appropriate
stock powers executed in blank attached  thereto)  evidencing a number of Common
Shares of the Company  equal to the then  Purchase  Price divided by the closing
price (as  determined  pursuant to Section 11(d) hereof) per Common Share on the
Trading Day (as such term is hereinafter defined) immediately preceding the date
of such exercise.  If the Company is obligated to issue other  securities of the
Company,  pay cash and/or  distribute  other property  pursuant to Section 11(a)
hereof,  the Company  will make all  arrangements  necessary  so that such other
securities,  cash and/or other  property are available for  distribution  by the
Rights Agent, if and when appropriate.

          (d) In case the  registered  holder  of any  Right  Certificate  shall
exercise less than all the Rights  evidenced  thereby,  a new Right  Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent to the registered holder of such Right Certificate or to his
duly authorized assigns, subject to the provisions of Section 14 hereof.

          (e)  Notwithstanding  anything  in  this  Agreement  to the  contrary,
neither the Rights  Agent nor the Company  shall be obligated to take any action
with respect to a registered  holder of a Right  Certificate upon the occurrence
of any purported transfer, assignment or exercise as set forth in this Section 7
unless  such  registered   holder  shall  have  (i)  completed  and  signed  the
certificate  following  the form of assignment or election to purchase set forth
on  the  reverse  of  the  Right  Certificate  surrendered  for  such  transfer,
assignment  or  exercise,  and (ii)  provided  such  additional  evidence of the
identity of the Beneficial Owner (or former  Beneficial  Owner) or Affiliates or
Associates thereof as the Company shall reasonably request.

          Section 8. Cancellation  and  Destruction of Right  Certificates.  All
Right Certificates surrendered for the purpose of exercise,  transfer, split up,
combination  or exchange  shall,  if surrendered to the Company or to any of its
agents,  be delivered to the Rights Agent for cancellation or in cancelled form,
or if  surrendered  to the Rights Agent,  shall be cancelled by it, and no Right
Certificates  shall be issued in lieu thereof  except as expressly  permitted by
any of the provisions of this Rights Agreement. The Company shall deliver to the
Rights  Agent for  cancellation  and  retirement,  and the Rights Agent shall so
cancel and retire,  any other  Right  Certificate  purchased  or acquired by the
Company otherwise than upon the exercise thereof. The Rights Agent shall deliver
all cancelled Right Certificates to the Company or shall, at the written request
of the Company,  destroy such  cancelled  Right  Certificates,  and in such case
shall deliver a certificate of destruction thereof to the Company.

                                       8

<PAGE>

          Section 9. Reservation and Availability of Common Shares.

          (a) The Company covenants and agrees that it will cause to be reserved
and kept  available  out of its  authorized  and unissued  Common  Shares or any
authorized  and issued Common Shares held in its treasury,  the number of Common
Shares that will be sufficient to permit the exercise in full of all outstanding
Rights in accordance with Section 7.

          (b) So long as the Common Shares  issuable upon the exercise of Rights
may be listed on any national  securities  exchange,  the Company  shall use its
best  efforts  to  cause,  from  and  after  such  time  as  the  Rights  become
exercisable,  all Common Shares  reserved for such issuance to be listed on such
exchange upon official notice of issuance upon such exercise.

          (c) The Company covenants and agrees that it will take all such action
as may be necessary to ensure that all Common Shares  delivered upon exercise of
Rights  shall,  at the time of  delivery  of the  certificates  for such  shares
(subject to payment of the Purchase Price),  be duly and validly  authorized and
issued and fully paid and nonassessable  shares (except as otherwise provided by
any corporation law applicable to the Company).

          (d) The Company further covenants and agrees that it will pay when due
and payable any and all federal and state  transfer  taxes and charges which may
be payable in respect of the issuance or delivery of the Right  Certificates  or
of any Common  Shares  upon the  exercise  of  Rights.  The  Company  shall not,
however,  be required to pay any transfer tax which may be payable in respect of
any transfer or delivery of Right  Certificates  to a person other than,  or the
issuance or delivery of certificates  for the Common Shares in a name other than
that of,  the  registered  holder of the  Right  Certificate  evidencing  Rights
surrendered for exercise or to issue or to deliver any  certificates  for Common
Shares upon the  exercise of any Rights  until any such tax shall have been paid
(any such tax being payable by the holder of such Right  Certificate at the time
of  surrender)  or until it has been  established  to the  Company's  reasonable
satisfaction that no such tax is due.

          Section 10. Common  Shares Record Date.  Each person in whose name any
certificate  for Common  Shares is issued upon the  exercise of Rights shall for
all purposes be deemed to have become the holder of record of the Common  Shares
represented thereby on, and such certificate shall be dated, the date upon which
the Right Certificate evidencing such Rights was duly surrendered and payment of
the  Purchase  Price (and any  applicable  transfer  taxes) was made;  provided,
however, that if the date of such surrender and payment is a date upon which the
Common  Shares  transfer  books of the Company are closed,  such person shall be
deemed to have become the record holder of such shares on, and such  certificate
shall be dated,  the next  succeeding  Business  Day on which the Common  Shares
transfer books of the Company are open.

          Section 11.  Adjustment of Purchase Price,  Number of Shares or Number
of Rights. The Purchase Price, the number of Common Shares covered by each Right
and the number of Rights outstanding are subject to adjustment from time to time
as provided in this Section 11.

                                       9

<PAGE>

                 a. (i) In the event the Company  shall at any time after the
       date of this  Agreement  (A) declare a dividend  on the Common  Shares
       payable in Common Shares, (B) subdivide the outstanding Common Shares,
       (C) combine the  outstanding  Common  Shares into a smaller  number of
       Common  Shares  or (D)  issue any  shares  of its  capital  stock in a
       reclassification   of  the   Common   Shares   (including   any   such
       reclassification in connection with a consolidation or merger in which
       the Company is the  continuing  or surviving  corporation),  except as
       otherwise provided in this Section 11(a), the Purchase Price in effect
       at the time of the record date for such  dividend or of the  effective
       date of such  subdivision,  combination or  reclassification,  and the
       number  and kind of shares of  capital  stock  issuable  on such date,
       shall be  proportionately  adjusted  so that the  holder  of any Right
       exercised  after such time shall be entitled to receive the  aggregate
       number and kind of shares of capital  stock  which,  if such Right had
       been exercised  immediately  prior to such date and at a time when the
       Common  Shares  transfer  books of the Company were open,  such holder
       would have owned upon such  exercise  and been  entitled to receive by
       virtue of such dividend, subdivision, combination or reclassification;
       provided, however, that in no event shall the consideration to be paid
       upon the exercise of one Right be less than the aggregate par value of
       the shares of capital  stock of the Company  issuable upon exercise of
       one Right. If an event occurs which would require an adjustment  under
       both Section 11(a)(i) and Section 11(a)(ii),  the adjustment  provided
       for in this  Section  11(a)(i)  shall be in addition  to, and shall be
       made prior to, any adjustment required pursuant to Section 11(a)(ii).


                 (ii) Subject to Section 24 of this  Agreement,  in the event
       any Person shall become an Acquiring  Person,  other than  pursuant to
       any  transaction  set forth in Section  13(a),  each holder of a Right
       shall  thereafter have a right to receive,  upon exercise thereof at a
       price equal to the then current  Purchase  Price per full Common Share
       multiplied  by the  number of Common  Shares for which a Right is then
       exercisable,  in  accordance  with the terms of this  Agreement,  such
       number  of Common  Shares of the  Company  as shall  equal the  result
       obtained by (x) multiplying  the then current  Purchase Price per full
       Common Share by the number of Common  Shares for which a Right is then
       exercisable  and dividing  that product by (y) 50% of the then current
       per share market price of the Common Shares of the Company (determined
       pursuant to Section  11(d)) on the date the Person became an Acquiring
       Person (such number of shares, the "Adjustment Shares").

                 From and after such time as a Person  becomes  an  Acquiring
       Person (a  "Section  11(a)(ii)  Event"),  any Rights  that are or were
       acquired  or  beneficially  owned  by such  Acquiring  Person  (or any
       Associate or Affiliate of such Acquiring Person) shall be void and any
       holder of such Rights shall  thereafter have no right to exercise such
       Rights under any  provision of this  Agreement.  No Right  Certificate
       shall  be  issued  pursuant  to  Section  3  that  represents   Rights
       beneficially  owned by an Acquiring  Person whose Rights would be void
       pursuant to the  preceding  sentence  or any  Associate  or  Affiliate
       thereof;  no Right  Certificate  shall be  issued at any time upon the


                                       10

<PAGE>

      transfer of any Rights to an  Acquiring  Person  whose Rights would be
      void pursuant to the preceding  sentence or any Associate or Affiliate
      thereof  or to any  nominee of such  Acquiring  Person,  Associate  or
      Affiliate; and any Right Certificate delivered to the Rights Agent for
      transfer to an Acquiring Person whose Rights would be void pursuant to
      the preceding  sentence shall be cancelled.  The Company shall use all
      reasonable efforts to ensure that the provisions of this paragraph are
      complied  with,  but shall  have no  liability  to any holder of Right
      Certificates  or other  Person as a result of its  failure to make any
      determinations  with respect to an Acquiring Person or its Affiliates,
      Associates or transferees hereunder.

                (iii) In the event that there shall not be sufficient Common
      Shares of the Company  issued but not  outstanding  or authorized  but
      unissued  (and not reserved for issuance for purposes  other than upon
      exercise of the  Rights) to permit the  exercise in full of the Rights
      in accordance with the foregoing subparagraph (ii), the Company shall:
      (A)  determine  the excess of (1) the value of the  Adjustment  Shares
      issuable upon the exercise of a Right (the  "Current  Value") over (2)
      the Purchase  Price  payable with respect to such Right (such  excess,
      the  "Spread"),  and (B) with  respect to each  Right,  make  adequate
      provision to substitute for the Adjustment Shares, upon payment of the
      applicable  Purchase Price,  (1) cash, (2) a reduction in the Purchase
      Price,  (3) Common  Shares or other equity  securities  of the Company
      (including,  without  limitation,  shares,  or  units  of  shares,  of
      preferred  stock,  if any, which the Board of Directors of the Company
      has deemed to have the same  value as Common  Shares  (such  shares of
      preferred   stock,   hereinafter   referred   to  as   "common   stock
      equivalents")),  (4) debt securities of the Company,  (5) other assets
      or (6) any  combination  of the foregoing,  having an aggregate  value
      equal to the  Current  Value,  where  such  aggregate  value  has been
      determined  by the Board of  Directors  of the Company  based upon the
      advice of a nationally  recognized investment banking firm selected by
      the Board of  Directors  of the  Company;  provided,  however,  if the
      Company shall not have made adequate  provision to substitute  for the
      Adjustment Shares pursuant to clause (B) above within thirty (30) days
      following the  occurrence of a Section  11(a)(ii)  Event (the "Section
      11(a)(ii)  Trigger  Date"),  then the Company  shall be  obligated  to
      deliver,  upon the  surrender  for  exercise  of a Right  and  without
      requiring payment of any portion of the Purchase Price,  Common Shares
      (to the extent  available) and then, if necessary,  cash, which shares
      and/or cash have an aggregate value equal to the Spread.  If the Board
      of Directors of the Company  shall  determine in good faith that it is
      likely that  sufficient  additional  Common Shares might be authorized
      for issuance  for exercise in full of the Rights,  the thirty (30) day
      period set forth above may be extended  to the extent  necessary,  but
      not more than  ninety (90) days after the  Section  11(a)(ii)  Trigger
      Date, in order that the Company may seek  shareowner  approval for the
      authorization  of such  additional  shares (such period,  as it may be
      extended,  the "Substitution  Period"). To the extent that the Company
      determines that some action need be taken pursuant to the first and/or
      second  sentences  of this Section  11(a)(iii),  the Company (x) shall
      provide,  subject to the last paragraph of Section  11(a)(ii)  hereof,
      that such action shall apply uniformly to all 

                                       11

<PAGE>

       outstanding  Rights,  and (y) may  suspend the  exercisability  of the
       Rights until the  expiration  of the  Substitution  Period to seek any
       authorization  of additional  shares and/or to decide the  appropriate
       form of distribution to be made pursuant to such first sentence and to
       determine the value thereof. In the event of any such suspension,  the
       Company   shall  issue  a  public   announcement   stating   that  the
       exercisability of the Rights has been temporarily  suspended,  as well
       as a public  announcement  at such time as the suspension is no longer
       in effect. For purposes of this Section  11(a)(iii),  the value of the
       Common  Shares  shall  be the  current  per  share  market  price  (as
       determined  pursuant to Section  11(d) hereof) of the Common Shares on
       the Section  11(a)(ii) Trigger Date and the value of any "common stock
       equivalent"  shall be  deemed  to have the  same  value as the  Common
       Shares on such date.

          (b) In case the Company  shall fix a record  date for the  issuance of
rights,  options or warrants to all holders of Common Shares entitling them (for
a period  expiring  within 45 calendar days after such record date) to subscribe
for or purchase Common Shares (or securities  convertible into Common Shares) at
a price per Common Share (or having a conversion  price per share, if a security
convertible  into Common  Shares)  less than the then  current per share  market
price of the Common  Shares (as defined in Section  11(d)) on such record  date,
the Purchase Price to be in effect after such record date shall be determined by
multiplying the Purchase Price in effect  immediately  prior to such record date
by a  fraction,  the  numerator  of which  shall be the number of Common  Shares
outstanding  on such  record  date plus the  number of Common  Shares  which the
aggregate  offering  price of the total number of Common Shares so to be offered
(and/or the aggregate initial conversion price of the convertible  securities so
to be offered) would  purchase at such current market price and the  denominator
of which shall be the number of Common  Shares  outstanding  on such record date
plus the number of additional  Common Shares to be offered for  subscription  or
purchase  (or  into  which  the  convertible  securities  so to be  offered  are
initially  convertible);   provided,   however,  that  in  no  event  shall  the
consideration  to be paid  upon  the  exercise  of one  Right  be less  than the
aggregate par value of the shares of capital stock of the Company  issuable upon
exercise  of one  Right.  In  case  such  subscription  price  may be  paid in a
consideration part or all of which shall be in a form other than cash, the value
of such  consideration  shall be as  determined  in good  faith by the  Board of
Directors of the Company,  whose determination shall be described in a statement
filed with the Rights  Agent.  Common Shares owned by or held for the account of
the  Company  shall  not be  deemed  outstanding  for the  purpose  of any  such
computation.  Such adjustment shall be made successively  whenever such a record
date is fixed; and in the event that such rights, options or warrants are not so
issued,  the  Purchase  Price shall be adjusted to be the  Purchase  Price which
would then be in effect if such record date had not been fixed.

          (c) In case the  Company  shall fix a record  date for the making of a
distribution   to  all  holders  of  the  Common  Shares   (including  any  such
distribution  made in  connection  with a  consolidation  or merger in which the
Company is the continuing or surviving corporation) of evidences of indebtedness
or assets (other than a regular quarterly cash dividend or a dividend payable in
Common Shares) or subscription  rights or warrants  (excluding those referred to
in Section  11(b)),  the  Purchase  Price to be in effect after such record date
shall be  determined by  multiplying  the Purchase  Price in effect  immediately
prior to such  record date by a fraction,  the  

                                       12

<PAGE>

numerator  of which  shall be the then  current  per share  market  price of the
Common Shares (as defined in Section  11(d)) on such record date,  less the fair
market  value (as  determined  in good  faith by the Board of  Directors  of the
Company,  whose  determination  shall be described in a statement filed with the
Rights Agent) of the portion of the assets or evidences of indebtedness so to be
distributed or of such subscription  rights or warrants applicable to one Common
Share and the  denominator of which shall be such current per share market price
of  the  Common  Shares;   provided,   however,  that  in  no  event  shall  the
consideration  to be paid  upon  the  exercise  of one  Right  be less  than the
aggregate  par value of the shares of capital  stock of the Company to be issued
upon exercise of one Right. Such adjustments shall be made successively whenever
such a record date is fixed;  and in the event that such  distribution is not so
made,  the Purchase Price shall again be adjusted to be the Purchase Price which
would then be in effect if such record date had not been fixed.

          (d) For the purpose of any  computation  hereunder,  the  "current per
share market  price" of the Common  Shares on any date shall be deemed to be the
average of the daily  closing  prices per  Common  Share for the 30  consecutive
Trading Days (as such term is  hereinafter  defined)  immediately  prior to such
date;  provided,  however,  that in the event that the current per share  market
price  of the  Common  Shares  is  determined  during  a  period  following  the
announcement  by  the  issuer  of  such  Common  Shares  of  (i) a  dividend  or
distribution  on such  Common  Shares  payable  in Common  Shares or  securities
convertible  into  Common  Shares,  or  (ii)  any  subdivision,  combination  or
reclassification of Common Shares and prior to the expiration of 30 Trading Days
after the ex-dividend date for such dividend or distribution, or the record date
for such subdivision,  combination or  reclassification,  then, and in each such
case,  the current per share  market  price shall be  appropriately  adjusted to
reflect the current  market price per Common  Share.  The closing price for each
Trading Day shall be the last sale price,  regular way, or, in case no such sale
takes  place on such day,  the  average  of the  closing  bid and asked  prices,
regular  way,  in  either  case  as  reported  in  the  principal   consolidated
transaction  reporting  system with respect to securities  listed or admitted to
trading on the New York Stock  Exchange or, if the Common  Shares are not listed
or  admitted  to trading  on the New York Stock  Exchange,  as  reported  in the
principal  consolidated  transaction reporting system with respect to securities
listed on the principal national  securities exchange on which the Common Shares
are listed or  admitted  to trading  or, if the Common  Shares are not listed or
admitted to trading on any national securities  exchange,  the last quoted price
or, if not so quoted,  the  average of the high bid and low asked  prices in the
over-the-counter  market, as reported by the National  Association of Securities
Dealers,  Inc. Automated  Quotations System ("Nasdaq") or such other system then
in use,  or, if on any such date the  Common  Shares  are not quoted by any such
organization,  the average of the closing bid and asked prices as furnished by a
professional  market maker making a market in the Common Shares  selected by the
Board of Directors of the Company.  The term  "Trading  Day" shall mean a day on
which the principal national  securities exchange on which the Common Shares are
listed or admitted to trading is open for the transaction of business or, if the
Common  Shares are not listed or admitted to trading on any national  securities
exchange, a Business Day.

          (e) No adjustment in the Purchase Price shall be required  unless such
adjustment  would require an increase or decrease of at least 1% in the Purchase
Price;  provided,  however, that any adjustments which by reason of this Section
11(e) are not  required  to be made  

                                       13

<PAGE>

shall be carried  forward and taken into account in any  subsequent  adjustment.
All  calculations  under this Section 11 shall be made to the nearest cent or to
the nearest  ten-thousandth of a share as the case may be.  Notwithstanding  the
first sentence of this Section 11(e), any adjustment required by this Section 11
shall be made no later than the  earlier of (i) three years from the date of the
transaction which requires such adjustment or (ii) the date of the expiration of
the right to exercise any Rights.

          (f) If, as a result of an adjustment  made pursuant to Section  11(a),
the holder of any Right  thereafter  exercised  shall become entitled to receive
any shares of capital stock of the Company other than Common Shares,  thereafter
the number of such other shares so  receivable  upon exercise of any Right shall
be  subject to  adjustment  from time to time in a manner and on terms as nearly
equivalent as practicable  to the  provisions  with respect to the Common Shares
contained  in Section  11(a)  through  (c),  inclusive,  and the  provisions  of
Sections 7, 9, 10 and 13 with  respect to the Common  Shares shall apply on like
terms to any such other shares.

          (g) All Rights  originally  issued by the  Company  subsequent  to any
adjustment  made to the Purchase  Price  hereunder  shall  evidence the right to
purchase,   at  the  adjusted  Purchase  Price,  the  number  of  Common  Shares
purchasable from time to time hereunder upon exercise of the Rights, all subject
to further adjustment as provided herein.

          (h) Unless the Company  shall have  exercised its election as provided
in Section 11(i),  upon each adjustment of the Purchase Price as a result of the
calculations made in Section 11(b) and (c), each Right  outstanding  immediately
prior to the making of such adjustment  shall  thereafter  evidence the right to
purchase,  at  the  adjusted  Purchase  Price,  that  number  of  Common  Shares
(calculated  to the nearest  ten-thousandth  of a Common Share)  obtained by (i)
multiplying (x) the number of Common Shares covered by a Right immediately prior
to this adjustment by (y) the Purchase Price in effect immediately prior to such
adjustment  of the Purchase  Price and (ii)  dividing the product so obtained by
the Purchase Price in effect  immediately  after such adjustment of the Purchase
Price.

          (i) The  Company may elect on or after the date of any  adjustment  of
the  Purchase  Price to adjust  the number of Rights,  in  substitution  for any
adjustment  in the number of Common  Shares  purchasable  upon the exercise of a
Right.  Each of the Rights  outstanding  after such  adjustment of the number of
Rights shall be  exercisable  for the number of Common  Shares for which a Right
was exercisable immediately prior to such adjustment.  Each Right held of record
prior to such  adjustment  of the number of Rights  shall  become that number of
Rights (calculated to the nearest one  ten-thousandth)  obtained by dividing the
Purchase Price in effect  immediately  prior to adjustment of the Purchase Price
by the Purchase  Price in effect  immediately  after  adjustment of the Purchase
Price.  The Company shall make a public  announcement  of its election to adjust
the number of Rights,  indicating  the record date for the  adjustment,  and, if
known at the time, the amount of the adjustment to be made. This record date may
be the date on which the Purchase Price is adjusted or any day thereafter,  but,
if the Right Certificates have been issued, shall be at least 10 days later than
the date of the public  announcement.  If Right  Certificates  have been issued,
upon each adjustment of the number of Rights pursuant to this Section 11(i), the
Company shall, as promptly as practicable, cause to be distributed to holders of
record of Right Certificates on such 

                                       14

<PAGE>

record date Right  Certificates  evidencing,  subject to Section 14 hereof,  the
additional  Rights to which such  holders  shall be entitled as a result of such
adjustment,  or, at the option of the Company,  shall cause to be distributed to
such  holders  of  record  in   substitution   and  replacement  for  the  Right
Certificates  held by such  holders  prior to the date of  adjustment,  and upon
surrender thereof, if required by the Company, new Right Certificates evidencing
all the Rights to which such holders  shall be entitled  after such  adjustment.
Right  Certificates  so  to  be  distributed  shall  be  issued,   executed  and
countersigned  in the manner  provided for herein and shall be registered in the
names  of the  holders  of  record  of Right  Certificates  on the  record  date
specified in the public announcement.

          (j)  Irrespective of any adjustment or change in the Purchase Price or
the number of Common Shares issuable upon the exercise of the Rights,  the Right
Certificates  theretofore  and  thereafter  issued may  continue  to express the
Purchase  Price and the  number of Common  Shares  which were  expressed  in the
initial Right Certificates issued hereunder.

          (k) Before taking any action that would cause an  adjustment  reducing
the Purchase  Price below the par value,  if any, of the Common Shares  issuable
upon exercise of the Rights,  the Company shall take any corporate  action which
may, in the opinion of its  counsel,  be necessary in order that the Company may
validly and  legally  issue fully paid and  nonassessable  (except as  otherwise
provided by any corporation law applicable to the Company) Common Shares at such
adjusted Purchase Price.

          (l) In any  case in  which  this  Section  11  shall  require  that an
adjustment  in the  Purchase  Price be made  effective as of a record date for a
specified  event,  the Company may elect to defer until the  occurrence  of such
event the issuing to the holder of any Right exercised after such record date of
the Common Shares and other capital stock or securities of the Company,  if any,
issuable upon such exercise over and above the number of Common Shares and other
capital stock or securities of the Company,  if any, issuable upon such exercise
on the basis of the Purchase Price in effect prior to such adjustment; provided,
however,  that the  Company  shall  deliver  to such  holder a due bill or other
appropriate instrument evidencing such holder's right to receive such additional
shares upon the occurrence of the event requiring such adjustment.

          (m) Anything in this Section 11 to the contrary  notwithstanding,  the
Company  shall be entitled to make such  reductions  in the Purchase  Price,  in
addition to those adjustments  expressly  required by this Section 11, as and to
the extent that it in its sole  discretion  shall  determine  to be advisable in
order that any  consolidation  or  subdivision  of the Common  Shares,  issuance
wholly  for cash of any Common  Shares at less than the  current  market  price,
issuance wholly for cash of Common Shares or securities which by their terms are
convertible into or exchangeable  for Common Shares,  dividends on Common Shares
payable in Common Shares or issuance of rights,  options or warrants referred to
in Section 11(b),  hereafter made by the Company to holders of its Common Shares
shall not be taxable to such shareowners.

          (n) The  Company  covenants  and agrees that it shall not, at any time
after the earlier of the Distribution  Date or the Shares  Acquisition Date, (i)
consolidate  with any other Person  (other than a Subsidiary of the Company in a
transaction  which complies with Section 11(o) 

                                       15

<PAGE>

hereof),  (ii) merge with or into any other Person  (other than a Subsidiary  of
the Company in a transaction  which complies with Section 11(o)  hereof),  (iii)
sell or  transfer  (or  permit  any  Subsidiary  to sell  or  transfer),  in one
transaction,  or a series  of  related  transactions,  assets or  earning  power
aggregating  more than 50% of the assets or earning power of the Company and its
Subsidiaries  (taken as a whole) to any other Person or Persons  (other than the
Company and/or any of its Subsidiaries in one or more transactions each of which
complies with Section 11(o) hereof) or (iv) consummate a share exchange with any
other Person, if at the time of or immediately after such consolidation, merger,
sale or share exchange (A) there are any rights,  warrants or other  instruments
or securities  outstanding  or  agreements  in effect which would  substantially
diminish or  otherwise  eliminate  the  benefits  intended to be afforded by the
Rights,   (B)  prior  to,   simultaneously   with  or  immediately   after  such
consolidation,  merger, sale or share exchange the shareowners of the Person who
constitute,  or would constitute,  the "Principal Party" for purposes of Section
13(a) hereof shall have received a distribution  of Rights  previously  owned by
such Person or any of its Affiliates and Associates or (C) the form or nature of
organization of the Principal  Party would preclude or limit the  exercisability
of the Rights.

          (o) The Company  covenants  and agrees  that,  after the  Distribution
Date, it will not,  except as permitted by Section 23,  Section 24 or Section 27
hereof,  take (or permit any  Subsidiary to take) any action if at the time such
action is taken it is  reasonably  foreseeable  that such action  will  diminish
substantially or otherwise eliminate the benefits intended to be afforded by the
Rights.

          Section  12.  Certificate  of  Adjusted  Purchase  Price or  Number of
Shares. Whenever an adjustment is made as provided in Sections 11 and 13 hereof,
the  Company  shall  promptly  (a)  prepare a  certificate  setting  forth  such
adjustment,  and a brief statement of the facts  accounting for such adjustment,
(b) file  with the  Rights  Agent and with each  transfer  agent for the  Common
Shares a copy of such  certificate  and (c) mail a brief summary thereof to each
holder of a Right Certificate in accordance with Section 25 hereof.

          Section 13. Consolidation,  Merger, Share Exchange or Sale or Transfer
of Assets or Earning Power.

          (a) In the event that, following the Shares Acquisition Date, directly
or indirectly,  (x) the Company shall  consolidate with, or merge with and into,
any other Person (other than a Subsidiary of the Company in a transaction  which
complies with Section 11(o) hereof), and the Company shall not be the continuing
or surviving  corporation of such consolidation or merger, (y) any Person (other
than a Subsidiary  of the Company in a transaction  which  complies with Section
11(o) hereof) shall  consolidate  with, or merge with or into, the Company,  and
the  Company  shall  be  the   continuing  or  surviving   corporation  of  such
consolidation  or merger,  or any Person or Persons  (other than a Subsidiary of
the Company in a  transaction  that  complies  with Section  11(o) hereof) shall
consummate a share  exchange  with the  Company,  and, in  connection  with such
consolidation,  merger or share exchange,  all or part of the outstanding Common
Shares shall be changed into or exchanged  for stock or other  securities of any
other Person (or the Company) or cash or any other property,  or (z) the Company
shall sell or otherwise  transfer (or one or more of its Subsidiaries shall sell
or otherwise transfer),  in one transaction or a series of 

                                       16

<PAGE>

related  transactions,  assets or earning power aggregating more than 50% of the
assets or earning power of the Company and its  Subsidiaries  (taken as a whole)
to any Person or  Persons  (other  than the  Company  or any  Subsidiary  of the
Company in one or more  transactions  each of which  complies with Section 11(o)
hereof),  then, and in each such case,  proper  provision shall be made so that:
(i)  each  holder  of a  Right  (except  as  otherwise  provided  herein)  shall
thereafter have the right to receive, upon the exercise thereof at a price equal
to the then  current  Purchase  Price per full Common  Share  multiplied  by the
number of Common Shares for which a Right is then  exercisable (or, if a Section
11(a)(ii) Event has occurred prior to the first  occurrence of any of the events
described in clauses (x), (y) or (z) above (a "Section 13 Event"),  the Purchase
Price per full Common Share in effect  immediately prior to the first occurrence
of a Section 11(a)(ii) Event multiplied by the number of Common Shares for which
a Right  was  exercisable  immediately  prior  to  such  first  occurrence),  in
accordance with the terms of this Agreement,  such number of validly  authorized
and  issued,  fully paid,  nonassessable  (except as  otherwise  required by any
corporation  law applicable to the Principal  Party (as such term is hereinafter
defined)) and freely tradeable Common Shares of the Principal Party, not subject
to any liens, encumbrances,  rights of first refusal or other adverse claims, as
shall  be equal to the  result  obtained  by (1)  multiplying  the then  current
Purchase  Price per full Common Share by the number of Common Shares for which a
Right is exercisable  immediately  prior to the first occurrence of a Section 13
Event  (or,  if a  Section  11(a)(ii)  Event  has  occurred  prior to the  first
occurrence  of a Section 13 Event,  multiplying  the  number of such  shares for
which a Right was  exercisable  immediately  prior to the first  occurrence of a
Section  11(a)(ii)  Event by the Purchase  Price per full Common Share in effect
immediately prior to such first  occurrence),  and dividing that product (which,
following the first  occurrence  of a Section 13 Event,  shall be referred to as
the "Purchase  Price" for each Right and for all purposes of this  Agreement) by
(2) 50% of the  current  market  price  (determined  pursuant  to Section  11(d)
hereof) per Common Share of such Principal  Party on the date of consummation of
such Section 13 Event; (ii) such Principal Party shall thereafter be liable for,
and shall assume,  by virtue of such Section 13 Event,  all the  obligations and
duties of the Company pursuant to this Agreement; (iii) the term "Company" shall
thereafter be deemed to refer to such  Principal  Party,  it being  specifically
intended  that the  provisions  of  Section 11 hereof  shall  apply only to such
Principal Party following the first occurrence of a Section 13 Event;  (iv) such
Principal  Party  shall  take such steps  (including,  but not  limited  to, the
reservation of a sufficient  number of its Common Shares) in connection with the
consummation  of any such  transaction  as may be  necessary  to assure that the
provisions  hereof shall  thereafter be applicable,  as nearly as reasonably may
be, in relation to its Common Shares thereafter deliverable upon the exercise of
the Rights;  and (v) the provisions of Section  11(a)(ii)  hereof shall be of no
effect following the first occurrence of any Section 13 Event.

          (b) "Principal Party" shall mean

                 (i) in the case of any  transaction  described in clause (x)
       or (y) of the first sentence of Section 13(a),  the Person that is the
       issuer of any  securities  into which Common Shares of the Company are
       converted in such merger,  consolidation or share exchange,  and if no
       securities  are so issued,  (A) the Person  that is the other party to
       the merger,  consolidation  or share  exchange and that  survives such
       merger or  consolidation,  or, if there is more than one such  Person,
       the  Person the Common  

                                       17

<PAGE>

       Shares of which have the  greatest  aggregate  market  value of shares
       outstanding or (B) if the Person that is the other party to the merger
       or  consolidation  does not survive the merger or  consolidation,  the
       Person that does survive the merger or  consolidation  (including  the
       Company if it survives); and

                (ii) in the case of any  transaction  described in clause (z)
       of the first sentence of Section  13(a),  the Person that is the party
       receiving  the  greatest  portion  of  the  assets  or  earning  power
       transferred pursuant to such transaction or transactions;

provided,  however,  that in any such  case,  (1) if the  Common  Shares of such
Person are not at such time and have not been  continuously  over the  preceding
twelve (12)  month-period  registered  under Section 12 of the Exchange Act, and
such  Person is a direct or  indirect  Subsidiary  of another  Person the Common
Shares of which are and have been so registered,  "Principal  Party" shall refer
to such other Person;  and (2) in case such Person is a Subsidiary,  directly or
indirectly,  of more than one Person,  the Common Shares of two or more of which
are and have been so registered,  "Principal  Party" shall refer to whichever of
such Persons is the issuer of the Common  Shares  having the greatest  aggregate
market value.

         (c) The Company shall not  consummate any such  consolidation,  merger,
share  exchange,  sale or  transfer  unless  the  Principal  Party  shall have a
sufficient  number of  authorized  Common  Shares  which have not been issued or
reserved for issuance to permit the exercise in full of the Rights in accordance
with this  Section 13 and unless  prior  thereto the Company and such  Principal
Party shall have  executed  and  delivered  to the Rights  Agent a  supplemental
agreement  providing for the terms set forth in  paragraphs  (a) and (b) of this
Section 13 and further  providing that, as soon as practicable after the date of
any  consolidation,  merger,  share  exchange  or sale of  assets  mentioned  in
paragraph (a) of this Section 13, the Principal Party will:

               (i)  prepare  and file a  registration  statement  under  the
      Securities  Act of 1933,  as amended (the "Act"),  with respect to the
      Rights and the securities  purchasable  upon exercise of the Rights on
      an  appropriate  form,  and will use its best  efforts  to cause  such
      registration  statement to (A) become effective as soon as practicable
      after such filing and (B) remain  effective  (with a prospectus at all
      times meeting the  requirements of the Act) until the Final Expiration
      Date; and

               (ii)  deliver to holders of the Rights  historical  financial
      statements for the Principal  Party and each of its  Affiliates  which
      comply in all respects with the  requirements for registration on Form
      10 under the Exchange Act.

The provisions of this Section 13 shall similarly  apply to successive  mergers,
consolidations,  share exchanges,  sales or other transfers. In the event that a
Section  13 Event  shall  occur at any time  after the  occurrence  of a Section
11(a)(ii)  Event,  the Rights which have not  theretofore  been exercised  shall
thereafter become exercisable in the manner described in Section 13(a).

                                       18

<PAGE>

Section 14.      Fractional Rights and Fractional Shares.

          (a) The Company shall not be required to issue  fractions of Rights or
to distribute Right  Certificates  which evidence  fractional Rights. In lieu of
such  fractional  Rights,  there shall be paid to the registered  holders of the
Right  Certificates  with regard to which such fractional Rights would otherwise
be issuable,  an amount in cash equal to the same fraction of the current market
value of a whole  Right.  For the purposes of this  Section  14(a),  the current
market  value of a whole Right shall be the closing  price of the Rights for the
Trading Day immediately  prior to the date on which such fractional Rights would
have been  otherwise  issuable.  The closing price for any day shall be the last
sale price,  regular  way, or, in case no such sale takes place on such day, the
average of the  closing  bid and asked  prices,  regular  way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities  listed or admitted to trading on the New York Stock  Exchange or,
if the  Rights  are not  listed or  admitted  to  trading  on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national  securities exchange
on which the Rights are listed or  admitted to trading or, if the Rights are not
listed or  admitted to trading on any  national  securities  exchange,  the last
quoted  price or, if not so  quoted,  the  average of the high bid and low asked
prices in the  over-the-counter  market,  as  reported  by Nasdaq or such  other
system then in use or, if on any such date the Rights are not quoted by any such
organization,  the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors of the  Company.  If on any such date no such market maker is making a
market in the Rights the fair value of the Rights on such date as  determined in
good faith by the Board of Directors of the Company shall be used.

          (b) The Company  shall not be required  to issue  fractions  of Common
Shares upon exercise of the Rights or to distribute  certificates which evidence
fractional Common Shares. In lieu of fractional Common Shares, equal to one-half
of a Common Share or less,  the Company shall pay to the  registered  holders of
Right  Certificates  at the time such Rights are exercised as herein provided an
amount in cash equal to the same  fraction  of the current  market  value of one
Common Share.  Any exercise of Rights that would  entitle the holder  thereof to
receive any fraction of a Common Share  greater than  one-half of a Common Share
shall be governed by Section  7(a) hereof.  For purposes of this Section  14(b),
the current  market  value of a Common  Share  shall be the  closing  price of a
Common Share (as  determined  pursuant to the second  sentence of Section  11(d)
hereof) for the Trading Day immediately prior to the date of such exercise.

          (c) The  holder of a Right by the  acceptance  of the Right  expressly
waives his right to receive any fractional  Rights or any fractional shares upon
exercise of a Right (except as provided above).

          Section 15. Rights of Action.  All rights of action in respect of this
Agreement,  excepting  the  rights of action  given to the  Rights  Agent  under
Section 18 hereof, are vested in the respective  registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Right Certificate (or, prior to
the Distribution Date, of the Common Shares),  without the consent of the Rights
Agent  or of the  holder  of any  other  Right  Certificate  (or,  prior  to the
Distribution Date, of the Common

                                       19

<PAGE>

Shares),  may,  in his own  behalf  and for his own  benefit,  enforce,  and may
institute  and maintain any suit,  action or  proceeding  against the Company to
enforce,  or  otherwise  act in  respect  of, his right to  exercise  the Rights
evidenced  by such  Right  Certificate  in the  manner  provided  in such  Right
Certificate  and in  this  Agreement.  Without  limiting  the  foregoing  or any
remedies  available to the holders of Rights,  it is  specifically  acknowledged
that the  holders  of Rights  would not have an  adequate  remedy at law for any
breach of this  Agreement  and will be entitled to specific  performance  of the
obligations under, and injunctive relief against actual or threatened violations
of the obligations of any Person subject to, this Agreement.

          Section 16. Agreement  of Right  Holders.  Every holder of a Right, by
accepting  the same,  consents  and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

          (a) prior to the  Distribution  Date, the Rights will be  transferable
only in connection with the transfer of the Common Shares;

          (b)  after  the   Distribution   Date,  the  Right   Certificates  are
transferable  only on the registry  books of the Rights Agent if  surrendered at
the principal  office of the Rights Agent,  duly  endorsed or  accompanied  by a
proper instrument of transfer; and

          (c) the Company and the Rights  Agent may deem and treat the person in
whose  name the Right  Certificate  (or,  prior to the  Distribution  Date,  the
associated  Common  Shares  certificate)  is  registered  as the absolute  owner
thereof and of the Rights evidenced  thereby  (notwithstanding  any notations of
ownership or writing on the Right  Certificates or the associated  Common Shares
certificate  made by anyone other than the Company or the Rights  Agent) for all
purposes  whatsoever,  and neither  the  Company  nor the Rights  Agent shall be
affected by any notice to the contrary.

          (d)  notwithstanding  anything  in  this  Agreement  to the  contrary,
neither the Company nor the Rights Agent shall have any  liability to any holder
of a Right or other  Person as a result of its  inability  to perform any of its
obligations  under this  Agreement  by reason of any  preliminary  or  permanent
injunction  or other  order,  decree  or ruling  issued by a court or  competent
jurisdiction  or by a  governmental,  regulatory  or  administrative  agency  or
commission,  or any statute,  rule, regulation or executive order promulgated or
enacted by any  governmental  authority,  prohibiting  or otherwise  restraining
performance of such obligation; provided, however, the Company must use its best
efforts to have any such order, decree or ruling lifted or otherwise  overturned
as soon as possible.

          Section  17. Right  Certificate Holder  Not  Deemed a  Shareowner.  No
holder,  as such, of any Right  Certificate  shall be entitled to vote,  receive
dividends or other  distributions or be deemed for any purpose the holder of the
Common  Shares or any other  securities  of the Company which may at any time be
issuable on the exercise of the Rights represented  thereby,  nor shall anything
contained  herein or in any Right  Certificate  be  construed to confer upon the
holder of any Right  Certificate,  as such, any of the rights of a shareowner of
the  Company  or any right to vote for the  election  of  directors  or upon any
matter submitted to shareowners at any meeting  

                                       20

<PAGE>

thereof,  or to give or withhold consent to any corporate  action, or to receive
notice of meetings or other actions affecting shareowners (except as provided in
Section  25  hereof),  or  to  receive  dividends  or  subscription  rights,  or
otherwise,  until the Right or Rights evidenced by such Right  Certificate shall
have been exercised in accordance with the provisions hereof.

          Section 18. Concerning the Rights Agent.

          (a)  The  Company  agrees  to  pay  to  the  Rights  Agent  reasonable
compensation  for all services  rendered by it hereunder and, from time to time,
on demand of the Rights  Agent,  its  reasonable  expenses  and counsel fees and
other  disbursements  incurred  in the  administration  and  execution  of  this
Agreement and the exercise and performance of its duties hereunder.  The Company
also agrees to indemnify the Rights Agent for, and to hold it harmless  against,
any loss,  liability,  or expense,  incurred  without  negligence,  bad faith or
willful misconduct on the part of the Rights Agent, for anything done or omitted
by the Rights Agent in connection with the acceptance and administration of this
Agreement,  including  the costs and expenses of defending  against any claim of
liability in the premises.

          (b) The Rights Agent shall be  protected  and shall incur no liability
for, or in respect of any action taken,  suffered or omitted by it in connection
with,  its   administration  of  this  Agreement  in  reliance  upon  any  Right
Certificate or certificate for the Common Shares or for other  securities of the
Company,  instrument of assignment or transfer, power of attorney,  endorsement,
affidavit, letter, notice, direction, consent, certificate,  statement, or other
paper or document  believed by it to be genuine and to be signed,  executed and,
where necessary,  verified or acknowledged,  by the proper person or persons, or
otherwise upon the advice of counsel as set forth in Section 20 hereof.

Section 19.  Merger or Consolidation or Change of Name of Rights Agent.

          (a) Any  corporation  into  which the  Rights  Agent or any  successor
Rights  Agent  may be  merged  or  with  which  it may be  consolidated,  or any
corporation resulting from any merger or consolidation to which the Rights Agent
or any successor Rights Agent shall be a party, or any corporation succeeding to
the stock  transfer  or  corporate  trust  business  of the Rights  Agent or any
successor  Rights  Agent,  shall be the successor to the Rights Agent under this
Agreement without the execution or filing of any paper or any further act on the
part of any of the  parties  hereto,  provided  that such  corporation  would be
eligible for  appointment  as a successor  Rights Agent under the  provisions of
Section 21 hereof. In case at the time such successor Rights Agent shall succeed
to the agency created by this  Agreement,  any of the Right  Certificates  shall
have been  countersigned but not delivered,  any such successor Rights Agent may
adopt the  countersignature  of the  predecessor  Rights  Agent and deliver such
Right  Certificates so countersigned;  and in case at that time any of the Right
Certificates shall not have been  countersigned,  any successor Rights Agent may
countersign such Right Certificates either in the name of the predecessor Rights
Agent or in the name of the successor  Rights Agent;  and in all such cases such
Right  Certificates shall have the full force provided in the Right Certificates
and in this Agreement.

                                       21

<PAGE>

          (b) In case at any time the name of the Rights  Agent shall be changed
and at such time any of the Right Certificates shall have been countersigned but
not delivered,  the Rights Agent may adopt the countersignature  under its prior
name and deliver Right  Certificates so countersigned;  and in case at that time
any of the Right  Certificates  shall not have been  countersigned,  the  Rights
Agent may countersign such Right Certificates either in its prior name or in its
changed name; and in all such cases such Right  Certificates shall have the full
force provided in the Right Certificates and in this Agreement.

          Section 20. Duties of Rights Agent.  The Rights Agent  undertakes  the
duties and  obligations  imposed by this Agreement upon the following  terms and
conditions,  by all of which the Company and the holders of Right  Certificates,
by their acceptance thereof, shall be bound:

          (a) The Rights Agent may consult with legal  counsel (who may be legal
counsel  for the  Company),  and the opinion of such  counsel  shall be full and
complete authorization and protection to the Rights Agent as to any action taken
or omitted by it in good faith and in accordance with such opinion.

          (b) Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it  necessary  or  desirable  that any fact or matter be
proved or  established  by the Company  prior to taking or suffering  any action
hereunder,  such fact or matter  (unless  other  evidence in respect  thereof be
herein  specifically  prescribed)  may be deemed to be  conclusively  proved and
established  by a  certificate  signed by the  Chairman of the Board,  the Chief
Executive  Officer,  the President or any Vice President and by the Treasurer or
any Assistant  Treasurer or the Corporate  Secretary or any Assistant  Corporate
Secretary of the Company and delivered to the Rights Agent; and such certificate
shall be full authorization to the Rights Agent for any action taken or suffered
in good faith by it under the provisions of this Agreement in reliance upon such
certificate.

          (c) The Rights Agent shall be liable  hereunder to the Company and any
other Person only for its own negligence, bad faith or willful misconduct.

          (d) The  Rights  Agent  shall not be liable for or by reason of any of
the  statements of fact or recitals  contained in this Agreement or in the Right
Certificates (except its countersignature  thereof) or be required to verify the
same, but all such  statements and recitals are and shall be deemed to have been
made by the Company only.

          (e) The Rights Agent shall not be under any  responsibility in respect
of the validity of this  Agreement or the execution and delivery  hereof (except
the due authorization,  execution and delivery hereof by the Rights Agent) or in
respect of the  validity  or  execution  of any Right  Certificate  (except  its
countersignature  thereof);  nor shall it be  responsible  for any breach by the
Company of any covenant or condition contained in this Agreement or in any Right
Certificate; nor shall it be responsible for any change in the exercisability of
the Rights  (including  the Rights  becoming void pursuant to Section  11(a)(ii)
hereof) or any  adjustment  in the terms of the Rights  (including  the  manner,
method or amount  thereof)  provided  for in Section 3, 11, 13, 23 or 24, or 

                                       22

<PAGE>

the ascertaining of the existence of facts that would require any such change or
adjustment  (except with  respect to the  exercise of Rights  evidenced by Right
Certificates  after actual  notice that such change or  adjustment is required);
nor  shall it by any act  hereunder  be  deemed  to make any  representation  or
warranty as to the  authorization  or  reservation of any Common Shares or other
securities to be issued  pursuant to this Agreement or any Right  Certificate or
as to whether  any Common  Shares or other  securities  will,  when  issued,  be
validly authorized and issued, fully paid and nonassessable.

          (f) The Company agrees that it will perform, execute,  acknowledge and
deliver or cause to be performed, executed,  acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying  out or  performing  by the Rights Agent of
the provisions of this Agreement.

          (g) The  Rights  Agent is hereby  authorized  and  directed  to accept
instructions  with respect to the  performance of its duties  hereunder from any
one of the Chairman of the Board,  the Chief Executive  Officer,  the President,
any Vice President,  the Corporate Secretary, any Assistant Corporate Secretary,
the  Treasurer or any Assistant  Treasurer of the Company,  and to apply to such
officers for advice or instructions in connection with its duties,  and it shall
not be liable for any action taken or suffered by it in good faith in accordance
with  instructions  of any such officer or for any delay in acting while waiting
for those instructions.

          (h) The Rights Agent and any shareowner, director, officer or employee
of the Rights Agent may buy, sell or deal in, or act as the transfer  agent for,
any of the Rights,  Common  Shares or other  securities of the Company or become
pecuniarily   interested  in  any  transaction  in  which  the  Company  may  be
interested,  or contract  with or lend money to the Company or otherwise  act as
fully and  freely  as though it were not  Rights  Agent  under  this  Agreement.
Nothing herein shall preclude the Rights Agent from acting in any other capacity
for the Company or for any other legal entity.

          (i) The Rights  Agent may  execute and  exercise  any of the rights or
powers hereby vested in it or perform any duty hereunder  either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the  Company  resulting  from any such  act,  default,
neglect or misconduct,  provided  reasonable care was exercised in the selection
and continued employment thereof.

          Section 21. Change of Rights Agent.  The Rights Agent or any successor
Rights Agent may resign and be discharged  from its duties under this  Agreement
upon 30 days' notice in writing mailed to the Company and to each transfer agent
of the Common Shares by registered or certified  mail, and to the holders of the
Right  Certificates by first-class mail. The Company may remove the Rights Agent
or any  successor  Rights Agent upon 30 days'  notice in writing,  mailed to the
Rights Agent or successor Rights Agent, as the case may be, and to each transfer
agent of the Common Shares by registered or certified  mail,  and to the holders
of the Right  Certificates by first-class mail. If the Rights Agent shall resign
or be removed or shall otherwise become  incapable of acting,  the Company shall
appoint a successor to the Rights Agent.  If the

                                       23

<PAGE>

Company  shall  fail to make such  appointment  within a period of 30 days after
giving  notice of such removal or after it has been  notified in writing of such
resignation or incapacity by the resigning or  incapacitated  Rights Agent or by
the holder of a Right Certificate (who shall, with such notice, submit his Right
Certificate  for inspection by the Company),  then the registered  holder of any
Right  Certificate  may apply to any  court of  competent  jurisdiction  for the
appointment of a new Rights Agent. Any successor Rights Agent, whether appointed
by the  Company or by such a court,  shall be (a) a  corporation  organized  and
doing  business  under the laws of the United States or of the State of New York
or the State of Wisconsin (or of any other state of the United States so long as
such  corporation  is authorized to do business as a banking  institution in the
State of New York or the State of Wisconsin), in good standing, having an office
or  agency  in the  State  of  Wisconsin  or the  State  of New  York,  which is
authorized under such laws to exercise  corporate trust or stock transfer powers
and is subject to supervision  or examination by federal or state  authority and
which has at the time of its appointment as Rights Agent a combined  capital and
surplus of at least $50 million, or (b) an Affiliate of a corporation  described
in clause (a) of this sentence.  After  appointment,  the successor Rights Agent
shall be vested with the same powers,  rights, duties and responsibilities as if
it had been  originally  named as Rights Agent without  further act or deed; but
the predecessor  Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance,  conveyance, act or deed necessary for the purpose. Not later
than the effective  date of any such  appointment  the Company shall file notice
thereof in writing with the predecessor  Rights Agent and each transfer agent of
the Common  Shares,  and mail a notice  thereof  in  writing  to the  registered
holders of the Right  Certificates.  Failure to give any notice  provided for in
this Section 21, however,  or any defect therein,  shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the appointment
of the successor Rights Agent, as the case may be.

          Section 22. Issuance of New Right Certificates. Notwithstanding any of
the provisions of this  Agreement or of the Rights to the contrary,  the Company
may, at its option, issue new Right Certificates  evidencing Rights in such form
as may be approved by its Board of Directors to reflect any adjustment or change
in the  Purchase  Price  and the  number  or kind or  class of  shares  or other
securities  or  property  purchasable  under  the  Right  Certificates  made  in
accordance with the provisions of this Agreement.

          Section 23. Redemption.

          (a) The Rights  may be  redeemed  by action of the Board of  Directors
pursuant to  subsection  (b) of this Section 23 and shall not be redeemed in any
other manner.

          (b) The Board of Directors  of the Company may, at its option,  at any
time prior to such time as any Person  becomes an Acquiring  Person,  redeem all
but not less than all the then outstanding Rights at a redemption price of $.001
per Right,  appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof (such redemption price being
hereinafter referred to as the "Redemption Price"). The redemption of the Rights
by the Board of Directors  may be made  effective at such time on such basis and
with  such  conditions  as the Board of  Directors  in its sole  discretion  may
establish. Notwithstanding anything contained in this Agreement to the contrary,
the Rights  shall not be  exercisable  after the first  occurrence  of a 

                                       24

<PAGE>

Section  11(a)(ii)  Event until such time as the  Company's  right of redemption
hereunder has expired.

          (c) Immediately  upon the  effectiveness of the action of the Board of
Directors  of the Company  ordering  the  redemption  of the Rights  pursuant to
subsection  (b) of this  Section 23, and without any further  action and without
any notice,  the right to exercise the Rights will  terminate and the only right
thereafter  of the holders of Rights shall be to receive the  Redemption  Price.
The Company shall promptly give public notice of any such redemption;  provided,
however,  that the failure to give,  or any defect in, any such notice shall not
affect the validity of such redemption.  Within 10 days after the  effectiveness
of the action of the Board of Directors  ordering the  redemption  of the Rights
pursuant to subsection (b), the Company shall mail a notice of redemption to all
the  holders  of the then  outstanding  Rights at their last  addresses  as they
appear upon the registry books of the Rights Agent or, prior to the Distribution
Date, on the registry  books of the transfer  agent for the Common  Shares.  Any
notice  which is mailed in the manner  herein  provided  shall be deemed  given,
whether or not the holder  receives the notice.  Each such notice of  redemption
will state the method by which the payment of the Redemption Price will be made.
Neither the Company nor any of its Affiliates or Associates may redeem,  acquire
or  purchase  for value any  Rights at any time in any  manner  other  than that
specifically  set forth in this  Section 23 or in  Section 24 hereof,  and other
than in connection with the purchase of Common Shares prior to the  Distribution
Date.

          Section 24. Exchange.

          (a) The Board of Directors  of the Company may, at its option,  at any
time after any Person becomes an Acquiring  Person,  exchange all or part of the
then  outstanding  and  exercisable  Rights (which shall not include Rights that
have become void  pursuant to the  provisions of Section  11(a)(ii)  hereof) for
Common Shares of the Company at an exchange ratio of one Common Share per Right,
appropriately  adjusted to reflect any stock  split,  stock  dividend or similar
transaction   occurring  after  the  date  hereof  (such  exchange  ratio  being
hereinafter referred to as the "Exchange Ratio"). Notwithstanding the foregoing,
the Board of Directors  shall not be  empowered  to effect such  exchange at any
time after any Person  (other than the Company,  any  Subsidiary of the Company,
any  employee  benefit  plan of the Company or any such  Subsidiary,  any entity
holding  Common  Shares for or  pursuant  to the terms of any such plan,  or any
trustee,  administrator  or  fiduciary  of  such  a  plan),  together  with  all
Affiliates and Associates of such Person, becomes the Beneficial Owner of 50% or
more of the Common Shares then outstanding.

          (b)  Immediately  upon the  action  of the Board of  Directors  of the
Company  ordering the exchange of any Rights  pursuant to subsection (a) of this
Section 24 and without any further  action and without any notice,  the right to
exercise such Rights shall  terminate and the only right  thereafter of a holder
of such Rights  shall be to receive  that number of Common  Shares  equal to the
number of such Rights held by such holder  multiplied by the Exchange Ratio. The
Company  shall  promptly  give  public  notice of any such  exchange;  provided,
however,  that the  failure to give,  or any defect in,  such  notice  shall not
affect the validity of such exchange.  The Company  promptly shall mail a notice
of any  such  exchange  to all of the  holders  of such  Rights  at  their  last
addresses as they appear upon the registry books of the Rights Agent. Any notice
which is mailed in the 

                                       25

<PAGE>

manner herein provided shall be deemed given, whether or not the holder receives
the  notice.  Each such  notice of  exchange  will state the method by which the
exchange of the Common  Shares for Rights will be effected  and, in the event of
any partial exchange, the number of Rights which will be exchanged.  Any partial
exchange  shall be effected  pro rata based on the number of Rights  (other than
Rights which have become void pursuant to the  provisions  of Section  11(a)(ii)
hereof) held by each holder of Rights.

          (c) In any exchange  pursuant to this Section 24, the Company,  at its
option,  may  substitute  common stock  equivalents  (as such term is defined in
Section 11(a)(iii) hereof) for some or all of the Common Shares exchangeable for
Rights.

          (d) In the event that there shall not be  sufficient  Common Shares or
common stock  equivalents  issued but not outstanding or authorized but unissued
to permit any exchange of Rights as contemplated in accordance with this Section
24, the Company  shall take all such  action as may be  necessary  to  authorize
additional  Common Shares or common stock equivalents for issuance upon exchange
of the Rights.

          (e) The Company  shall not be required  to issue  fractions  of Common
Shares or to distribute certificates which evidence fractional Common Shares. In
lieu of such fractional  Common Shares,  the Company shall pay to the registered
holders of the Right  Certificates  with regard to which such fractional  Common
Shares would otherwise be issued an amount in cash equal to the same fraction of
the current  market  value of a whole  Common  Share.  For the  purposes of this
paragraph  (e),  the current  market  value of a whole Common Share shall be the
closing price of a Common Share (as determined  pursuant to the second  sentence
of Section  11(d) hereof) for the Trading Day  immediately  prior to the date of
exchange pursuant to this Section 24.

          Section 25. Notice of Certain Events.

          (a) In case the Company shall propose,  after the  Distribution  Date,
(i) to pay any  dividend  payable in stock of any class to the holders of Common
Shares or to make any other  distribution to the holders of Common Shares (other
than a regular quarterly cash dividend),  (ii) to offer to the holders of Common
Shares rights or warrants to subscribe for or to purchase any additional  Common
Shares  or  shares  of stock of any  class or any  other  securities,  rights or
options,  (iii) to effect any  reclassification  of Common  Shares (other than a
reclassification  involving only the subdivision of outstanding  Common Shares),
(iv) to effect any  consolidation or merger into or with (other than a merger of
a Subsidiary into or with the Company),  to effect any share exchange with or to
effect any sale or other transfer (or to permit one or more of its  Subsidiaries
to effect any sale or other transfer),  in one or more  transactions,  of 50% or
more of the assets or earning power of the Company and its  Subsidiaries  (taken
as a whole) to, any other Person, or (v) to effect the liquidation,  dissolution
or winding up of the Company, then, in each such case, the Company shall give to
each holder of a Right  Certificate,  in  accordance  with Section 26 hereof,  a
notice of such  proposed  action,  which  shall  specify the record date for the
purposes of such stock dividend,  or distribution of rights or warrants,  or the
date on which such  reclassification,  consolidation,  merger,  share  exchange,
sale, transfer, liquidation, dissolution, or winding up is to take place and the
date of  participation  therein by the holders of the Common  Shares if any such
date is to be fixed, and 

                                       26

<PAGE>

such notice shall be so given in the case of any action covered by clause (i) or
(ii) above at least 10 days prior to the record date for determining  holders of
Common  Shares for  purposes of such  action,  and in the case of any such other
action, at least 10 days prior to the date of the taking of such proposed action
or the date of  participation  therein  by the  holders  of the  Common  Shares,
whichever shall be the earlier.

          (b) In case any of Section  11(a)(ii)  Event or Section 13 Event shall
occur,  then,  in any such case,  (i) the Company  shall as soon as  practicable
thereafter  give to each  holder  of a Right  Certificate,  in  accordance  with
Section 26 hereof, a notice of the occurrence of such event,  which notice shall
include a brief summary of the Section  11(a)(ii)  Event or Section 13 Event, as
the case may be, and the consequences thereof to holders of Rights.

          Section 26 Notices.

          (a) Notices or demands  authorized  by this  Agreement  to be given or
made by the Rights Agent or by the holder of any Right  Certificate to or on the
Company shall be sufficiently given or made if sent by first-class mail, postage
prepaid,  addressed  (until another  address is filed in writing with the Rights
Agent) as follows:

                  Interstate Energy Corporation
                  222 West Washington Avenue
                  Madison, Wisconsin 53703
                  Attention:  Corporate Secretary

          (b)  Subject to the  provisions  of  Section 21 hereof,  any notice or
demand authorized by this Agreement to be given or made by the Company or by the
holder of any Right  Certificate to or on the Rights Agent shall be sufficiently
given or made if sent by first-class  mail,  postage  prepaid,  addressed (until
another address is filed in writing with the Company) as follows:

                  Firstar Bank Milwaukee, N. A.
                  1555 RiverCenter Drive, Suite 301
                  Milwaukee, Wisconsin 53212
                  Attention:  Corporate Trust Department

          (c) Notices or demands  authorized  by this  Agreement  to be given or
made by the Company or the Rights  Agent to the holder of any Right  Certificate
shall  be  sufficiently  given  or made if sent  by  first-class  mail,  postage
prepaid,  addressed to such holder at the address of such holder as shown on the
registry books of the Company.

          Section 27. Supplements and Amendments. Prior to the Distribution Date
and subject to the penultimate  sentence of this Section 27, the Company may and
the Rights  Agent  shall,  if the  Company so directs,  supplement  or amend any
provision of this Agreement  without the approval of any holders of certificates
representing Common Shares.  Without limiting the foregoing,  the Company may at
any time prior to such time as any Person becomes an Acquiring Person amend this
Agreement  to lower the  thresholds  set forth in Sections  1(a) and 3(a) hereof

                                       27

<PAGE>


from 15% to not less than 10%,  with  appropriate  exceptions  for persons  then
beneficially  owning Common Shares of the Company  constituting  a percentage of
the number of Common  Shares then  outstanding  equal to or in excess of the new
threshold.  From and after the Distribution  Date and subject to the penultimate
sentence of this  Section 27, the Company  and the Rights  Agent  shall,  if the
Company so directs,  supplement or amend this Agreement  without the approval of
any holders of Right  Certificates  in order (i) to cure any ambiguity,  (ii) to
correct or supplement any provision  contained  herein which may be defective or
inconsistent with any other provision  herein,  (iii) to shorten or lengthen any
time period hereunder,  or (iv) to change or supplement the provisions hereunder
in any manner which the Company may deem  necessary or desirable and which shall
not adversely affect the interests of the holders of Right  Certificates  (other
than an Acquiring  Person or an Affiliate or Associate of an Acquiring  Person);
provided,  that from and after the  Distribution  Date this Agreement may not be
supplemented or amended to lengthen,  pursuant to clause (iii) of this sentence,
(A) a time  period  relating  to when the Rights may be redeemed at such time as
the Rights are not then  redeemable,  or (B) any other time  period  unless such
lengthening is for the purpose of protecting, enhancing or clarifying the rights
of,  and/or the  benefits  to, the  holders of Rights.  Upon the  delivery  of a
certificate  from an  appropriate  officer of the Company  which states that the
proposed supplement or amendment is in compliance with the terms of this Section
27, the Rights Agent shall execute such supplement or amendment. Notwithstanding
anything contained in this Agreement to the contrary, no supplement or amendment
shall be made which reduces the then effective  Redemption  Price or moves to an
earlier date the then effective Final Expiration Date. Prior to the Distribution
Date, the interests of the holders of Rights shall be deemed coincident with the
interests of the holders of Common Shares.

          Section 28.  Successors.  All the  covenants  and  provisions  of this
Agreement  by or for the benefit of the  Company or the Rights  Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

          Section 29.  Benefits  of this  Agreement.  Nothing in this  Agreement
shall be construed to give to any person or corporation  other than the Company,
the Rights  Agent and the  registered  holders of the Right  Certificates  (and,
prior to the Distribution Date, the Common Shares) any legal or equitable right,
remedy or claim under this  Agreement;  but this Agreement shall be for the sole
and  exclusive  benefit  of the  Company,  the Rights  Agent and the  registered
holders of the Right  Certificates  (and,  prior to the  Distribution  Date, the
Common Shares).

          Section  30.  Severability.   If  any  term,  provision,  covenant  or
restriction  of this Agreement is held by a court of competent  jurisdiction  or
other  authority  to be invalid,  void or  unenforceable,  the  remainder of the
terms, provisions,  covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated.

          Section 31.  Governing Law. This Agreement and each Right  Certificate
issued  hereunder  shall be deemed to be a  contract  made under the laws of the
State of Wisconsin  and for all purposes  shall be governed by and  construed in
accordance  with the laws of such State  applicable  to contracts to be made and
performed entirely within such State.

                                       28

<PAGE>

          Section 32. Counterparts. This Agreement may be executed in any number
of counterparts and each of such  counterparts  shall for all purposes be deemed
to be an original,  and all such counterparts shall together  constitute but one
and the same instrument.

          Section 33. Descriptive Headings.  Descriptive headings of the several
Sections of this  Agreement  are  inserted  for  convenience  only and shall not
control or affect the meaning or construction of any of the provisions hereof.

          Section 34. Determinations and Actions by the Board of Directors.  For
all purposes of this  Agreement,  any calculation of the number of Common Shares
outstanding at any particular  time,  including for purposes of determining  the
particular  percentage of such outstanding  Common Shares of which any Person is
the Beneficial Owner, shall be made in accordance with the last sentence of Rule
13d-3(d)(1)(i)  of the General Rules and Regulations under the Exchange Act. The
Board of Directors of the Company shall have the  exclusive  power and authority
to administer this Agreement and to exercise all rights and powers  specifically
granted to the Board or to the  Company,  or as may be necessary or advisable in
the administration of this Agreement,  including,  without limitation, the right
and power to (a) interpret the  provisions of this  Agreement,  and (b) make all
determinations  deemed  necessary or advisable  for the  administration  of this
Agreement  (including a  determination  to redeem or not redeem the Rights or to
amend the Agreement and any  determination  as to whether  actions or any Person
shall be such as to cause such Person to beneficially own shares held by another
Person).  All such actions,  calculations,  interpretations  and  determinations
(including, for purposes of clause (ii) below, all omissions with respect to the
foregoing)  which are done or made by the Board of the  Company  in good  faith,
shall (i) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights and all other  parties,  and (ii) not subject the Board of
the Company to any liability to the holders of the Rights.

                                       29

<PAGE>


          IN WITNESS  WHEREOF,  the parties hereto have caused this Agreement to
be duly executed and attested, all as of the day and year first above written.


                                       INTERSTATE ENERGY CORPORATION

Attest:


By:/s/Linda J. Wentzel                 By:/s/Edward M. Gleason
Title: Assistant Secretary             Title: Vice President



                                       FIRSTAR BANK MILWAUKEE, N. A.

Attest:


By:/s/Robert Dechant                   By:/s/Suzanne P. Norman Barnes
Title: Assistant Secretary             Title: Secretary


                                       30

<PAGE>





                                                           =====================
                                                                 EXHIBIT A
                                                           =====================


                           [Form of Right Certificate]


Certificate No. R-                                                _______ Rights


         NOT   EXERCISABLE   AFTER   JANUARY  20,  2009  (SUBJECT  TO
         EXTENSION) OR EARLIER IF REDEMPTION OR EXCHANGE OCCURS.  THE
         RIGHTS ARE SUBJECT TO  REDEMPTION  AT $.001 PER RIGHT AND TO
         EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT.


                                Right Certificate


                          INTERSTATE ENERGY CORPORATION

          This certifies that  ________________,  or registered  assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement,  dated as of January 20, 1999,  and as such  agreement may be amended
(the "Rights  Agreement"),  between Interstate Energy  Corporation,  a Wisconsin
corporation  (the  "Company"),  and Firstar  Bank  Milwaukee,  N. A., a national
banking  association (the "Rights  Agent"),  to purchase from the Company at any
time  after  the  Distribution  Date  (as such  term is  defined  in the  Rights
Agreement) and prior to 5:00 P.M., Madison, Wisconsin time, on January 20, 2009,
subject to  extension,  at the principal  office of the Rights Agent,  or at the
office  of  its  successor  as  Rights   Agent,   one-half  of  one  fully  paid
nonassessable (except as otherwise provided by any corporation law applicable to
the Company)  share of common stock,  par value $.01 ("Common  Shares"),  of the
Company,  at a purchase price of $95.00 per Common Share (the "Purchase  Price")
(equivalent  to $47.50 for each one-half of a Common Share),  upon  presentation
and  surrender of this Right  Certificate  with the Form of Election to Purchase
duly executed. The number of Rights evidenced by this Right Certificate (and the
number of Common Shares which may be purchased  upon exercise  hereof) set forth
above, and the Purchase Price set forth above, are the number and Purchase Price
as of January 20, 1999,  based on the Common Shares as constituted at such date.
Rights may only be  exercised  in integral  multiples of two. As provided in the
Rights  Agreement,  the Purchase Price and the number of Common Shares which may
be purchased upon the exercise of the Rights evidenced by this Right Certificate
are subject to modification and adjustment upon the happening of certain events.

          This Right Certificate is subject to all of the terms,  provisions and
conditions of the Rights Agreement,  which terms,  provisions and conditions are
hereby  incorporated  herein by  reference  and made a part  hereof and to which
Rights Agreement  reference is hereby made for a full 

                                      A-1

<PAGE>


description  of the  rights,  limitations  of  rights,  obligations,  duties and
immunities  hereunder  of the Rights  Agent,  the Company and the holders of the
Right Certificates.  Copies of the Rights Agreement are on file at the principal
executive offices of the Company and the  above-mentioned  offices of the Rights
Agent.

          This Right Certificate, with or without other Right Certificates, upon
surrender at the  principal  office of the Rights  Agent,  may be exchanged  for
another  Right  Certificate  or  Right  Certificates  of  like  tenor  and  date
evidencing  Rights  entitling the holder to purchase a like aggregate  number of
Common  Shares  as the  Rights  evidenced  by the  Right  Certificate  or  Right
Certificates  surrendered  shall have entitled such holder to purchase.  If this
Right  Certificate  shall be exercised in part,  the holder shall be entitled to
receive upon surrender  hereof another Right  Certificate or Right  Certificates
for the number of whole Rights not exercised.

          Subject  to  the  provisions  of  the  Rights  Agreement,  the  Rights
evidenced by this Certificate (i) may be redeemed by the Company at a redemption
price of $.001 per Right or (ii) may be exchanged in whole or in part for Common
Shares.  The Board of Directors  of the Company may, at its option,  at any time
after any  Person  becomes  an  Acquiring  Person,  but  prior to such  Person's
acquisition of 50% or more of the outstanding Common Shares, exchange the Rights
evidenced by the  Certificate  for Common  Shares,  at an exchange  ratio of one
Common  Share per  Right,  subject  to  adjustment,  as  provided  in the Rights
Agreement.

          No  fractional  Common  Shares will be issued upon the exercise of any
Right or Rights  evidenced  hereby,  but in lieu  thereof a cash payment will be
made, as provided in the Rights Agreement. No Rights may be exercised that would
entitle the holder to any fraction of a Common Share  greater than one-half of a
Common Share unless  concurrently  therewith such holder purchases an additional
fraction of a Common Share which,  when added to the number of Common  Shares to
be received upon such exercise,  equals an integral number of Common Shares,  as
provided in the Rights Agreement.

          No holder  of this  Right  Certificate  shall be  entitled  to vote or
receive  dividends or be deemed for any purpose the holder of the Common  Shares
or of any other  securities  of the Company which may at any time be issuable on
the exercise  hereof,  nor shall anything  contained in the Rights  Agreement or
herein be construed to confer upon the holder hereof, as such, any of the rights
of a  shareowner  of the  Company  or any  right  to vote  for the  election  of
directors or upon any matter submitted to shareowners at any meeting thereof, or
to give or withhold  consent to any corporate  action,  or to receive  notice of
meetings  or other  actions  affecting  shareowners  (except as  provided in the
Rights Agreement), or to receive dividends or subscription rights, or otherwise,
until the Right or Rights  evidenced by this Right  Certificate  shall have been
exercised as provided in the Rights Agreement.

          This  Right  Certificate  shall  not be  valid or  obligatory  for any
purpose until it shall have been countersigned by the Rights Agent.

                                      A-2

<PAGE>

          WITNESS the facsimile  signature of the proper officers of the Company
and its corporate seal. Dated as of ____________, ____.

ATTEST:                               INTERSTATE ENERGY CORPORATION



__________________________________      By:   _______________________________
                                               Title:   ________________________




Countersigned:



FIRSTAR BANK MILWAUKEE, N. A.



By:   _______________________________
      Authorized Signature


                                      A-3

<PAGE>


                   [Form of Reverse Side of Right Certificate]


                               FORM OF ASSIGNMENT
                               ------------------

                   (To be executed by the registered holder if
                    such holder desires to transfer the Right
                                 Certificate.)


          FOR  VALUE  RECEIVED   _______________________________  hereby  sells,
assigns  and  transfers  unto___________________________________________________
                             (Please  print name and  address  of  transferee)
this Right Certificate,  together with all right,  title and  interest  therein,
and does hereby  irrevocably  constitute  and appoint  _________________________
Attorney,  to transfer the  within Right Certificate on the books of the within-
named  Company, with full power of substitution.


Dated:   ____________, ____


                                    --------------------------------------------
                                    Signature



Signature Guaranteed:

          The  undersigned  hereby  certifies that the Rights  evidenced by this
Right  Certificate  are not  beneficially  owned by an  Acquiring  Person  or an
Affiliate or Associate thereof (as defined in the Rights Agreement).

                                    -------------------------------------
                                    Signature

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


                                      A-4

<PAGE>


            [Form of Reverse Side of Right Certificate -- continued]

                          FORM OF ELECTION TO PURCHASE

                      (To be executed if holder desires to
                        exercise the Right Certificate.)

To INTERSTATE ENERGY CORPORATION:

          The    undersigned    hereby    irrevocably    elects   to    exercise
__________________  Rights represented by this Right Certificate to purchase the
Common  Shares  issuable  upon the  exercise  of such Rights and  requests  that
certificates for such Common Shares be issued in the name of:

Please insert social security
or other identifying number

- --------------------------------------------------------------------------------
                        (Please print name and address)

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

If such  number of Rights  shall not be all the Rights  evidenced  by this Right
Certificate,  a new Right  Certificate for the balance  remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number

- --------------------------------------------------------------------------------
                         (Please print name and address)

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

Dated:   ____________, ____

                                          --------------------------------------
                                          Signature


Signature Guaranteed:

          Signatures  must  be  guaranteed  by a  member  firm  of a  registered
national securities exchange, a member of the National Association of Securities
Dealers,  Inc.,  or a  commercial  bank or trust  company  having  an  office or
correspondent in the United States.

                                      A-5

<PAGE>


            [Form of Reverse Side of Right Certificate -- continued]

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

          The  undersigned  hereby  certifies that the Rights  evidenced by this
Right  Certificate  are not  beneficially  owned by an  Acquiring  Person  or an
Affiliate or Associate thereof (as defined in the Rights Agreement).


                                           -------------------------------------
                                           Signature


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

                                     NOTICE

          The signature in the foregoing  Forms of Assignment  and Election must
conform to the name as written upon the face of this Right  Certificate in every
particular, without alteration or enlargement or any change whatsoever.

          In the  event  the  certification  set  forth  above  in the  Form  of
Assignment  or the Form of  Election  to  Purchase,  as the case may be,  is not
completed,  the Company and the Rights Agent will deem the  beneficial  owner of
the Rights  evidenced by this Right  Certificate to be an Acquiring Person or an
Affiliate or  Associate  thereof (as defined in the Rights  Agreement)  and such
Assignment or Election to Purchase will not be honored.





                                      A-6


<PAGE>


                                                           =====================
                                                                 EXHIBIT B
                                                           =====================




                          INTERSTATE ENERGY CORPORATION

                          SUMMARY OF RIGHTS TO PURCHASE
                                  COMMON SHARES

          On January 20,  1999,  the Board of  Directors  of  Interstate  Energy
Corporation  (the  "Company")  declared a dividend of one common share  purchase
right (a "Right") for each  outstanding  share of common  stock,  $.01 par value
(the "Common Shares"), of the Company. The dividend is payable upon the close of
business on February  22,  1999 to the  shareowners  of record on that date (the
"Record Date").  Each Right entitles the registered  holder to purchase from the
Company  one-half  of one Common  Share,  at a price of $95.00 per Common  Share
(equivalent  to  $47.50  for  each  one-half  of a  Common  Share),  subject  to
adjustment (the "Purchase  Price").  The description and terms of the Rights are
set forth in a Rights Agreement (the "Rights Agreement") between the Company and
Firstar Bank Milwaukee, N. A., as Rights Agent (the "Rights Agent").

          Until  the  earlier  to  occur  of  (i) 10  days  following  a  public
announcement  that a person or group of affiliated or associated  persons (other
than the Company, a subsidiary of the Company or an employee benefit plan of the
Company  or a  subsidiary)  (an  "Acquiring  Person")  has  acquired  beneficial
ownership  of  15% or  more  of  the  outstanding  Common  Shares  (the  "Shares
Acquisition  Date")  or (ii) 10  business  days  (or such  later  date as may be
determined by action of the Company's  Board of Directors  prior to such time as
any person  becomes an  Acquiring  Person)  following  the  commencement  of, or
announcement  of an  intention  to make,  a tender  offer or exchange  offer the
consummation  of which would result in the  beneficial  ownership by a person or
group  (other  than the  Company,  a  subsidiary  of the  Company or an employee
benefit plan of the Company or a subsidiary) of 15% or more of such  outstanding
Common Shares (the earlier of such dates being called the "Distribution  Date"),
the  Rights  will  be  evidenced,  with  respect  to  any of  the  Common  Share
certificates   outstanding   as  of  the  Record  Date,  by  such  Common  Share
certificate.

          The Rights Agreement  provides that, until the Distribution  Date, the
Rights  will be  transferred  with and only with the  Common  Shares.  Until the
Distribution  Date (or earlier  redemption  or  expiration  of the Rights),  new
Common Share  certificates  issued after the Record Date,  upon  transfer or new
issuance of Common  Shares,  will  contain a notation  incorporating  the Rights
Agreement by reference.  Until the Distribution  Date (or earlier  redemption or
expiration of the Rights),  the surrender for transfer of any  certificates  for
Common Shares,  outstanding  as of the Record Date,  even without such notation,
will also  constitute  the  transfer  of the Rights  associated  with the Common
Shares  represented by such  certificate.  As soon as practicable  following the
Distribution  Date,   separate   certificates   evidencing  the  Rights  ("Right
Certificates")  will be mailed to holders  of record of the Common  Shares as of
the  close  of  business  on the  Distribution  Date  and  such  separate  Right
Certificates alone will evidence the Rights.

                                      B-1

<PAGE>

          The Rights are not exercisable  until the  Distribution  Date. No less
than two Rights,  and only integral multiples of two Rights, may be exercised at
any one time by any holder of Rights. The Rights will expire on January 20, 2009
(the  "Final  Expiration  Date"),  unless  the Rights are  earlier  redeemed  or
exchanged by the Company,  or the Rights  Agreement is amended,  in each case as
described below.

          The Purchase Price  payable,  and the number of Common Shares or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from time to time to  prevent  dilution  (i) in the event of a stock
dividend on, or a subdivision,  combination or  reclassification  of, the Common
Shares, (ii) upon the grant to holders of the Common Shares of certain rights or
warrants to subscribe for or purchase  Common  Shares at a price,  or securities
convertible  into Common  Shares  with a  conversion  price,  less than the then
current  market  price of the Common  Shares or (iii) upon the  distribution  to
holders of the Common Shares of evidences of indebtedness  or assets  (excluding
regular  quarterly cash  dividends or dividends  payable in Common Shares) or of
subscription rights or warrants (other than those referred to above).

          In the event that any person  becomes an Acquiring  Person (a "Flip-In
Event"),  holders  of  Rights  (except  as  otherwise  provided  in  the  Rights
Agreement)  will  thereafter have the right to receive upon exercise that number
of  Common  Shares  (or,  in  certain  circumstances  cash,  property  or  other
securities of the Company or a reduction in the Purchase  Price) having a market
value of two times the then current Purchase Price.  Notwithstanding  any of the
foregoing,  following the  occurrence of a Flip-In Event all Rights that are, or
(under  certain  circumstances  specified  in the  Rights  Agreement)  were,  or
subsequently become  beneficially owned by an Acquiring Person,  related persons
and transferees will be null and void.

          In the event that, at any time following the Shares  Acquisition Date,
(i)  the  Company  is  acquired  in  a  merger  or  other  business  combination
transaction or I(ii) 50% or more of its consolidated assets or earning power are
sold (the events  described  in clauses  (i) and (ii) are herein  referred to as
"Flip-Over  Events"),  proper  provision  will be made so that holders of Rights
(except as otherwise  provided in the Rights Agreement) will thereafter have the
right to receive,  upon the exercise thereof at the then current Purchase Price,
that number of shares of common stock of the acquiring company which at the time
of such  transaction  will have a market  value of two  times  the then  current
Purchase Price.

          With certain  exceptions,  no adjustment in the Purchase Price will be
required until  cumulative  adjustments  require an adjustment of at least 1% in
such  Purchase  Price.  No fractional  Common Shares will be issued.  In lieu of
fractional  Common  Shares  equal  to  one-half  of a Common  Share or less,  an
adjustment  in cash will be made based on the market price of the Common  Shares
on the last  trading  day  prior  to the  date of  exercise.  No  Rights  may be
exercised that would entitle the holder  thereof to any fractional  Common Share
greater  than  one-half of a Common  Share unless  concurrently  therewith  such
holder  purchases an  additional  fraction of a Common Share which when added to
the  number  of Common  Shares to be  received  upon  such  exercise,  equals an
integral number of Common Shares.

                                      B-2

<PAGE>

          The Purchase  Price is payable by certified  check,  cashier's  check,
bank draft or money order or, if so provided by the Company,  the Purchase Price
following the occurrence of a Flip-In Event and until the first  occurrence of a
Flip-Over Event may be paid in Common Shares having an equivalent value.

          At any time after a person  becomes an  Acquiring  Person and prior to
the  acquisition  by such  Acquiring  Person  of 50% or more of the  outstanding
Common  Shares,  the Board of  Directors  of the Company may exchange the Rights
(other than Rights owned by any  Acquiring  Person which have become  void),  in
whole or in part,  at an exchange  ratio of one Common Share (or of a share of a
class or series of the Company's  preferred  stock,  if any,  having  equivalent
rights, preferences and privileges) per Right (subject to adjustment).

          At any time prior to a person becoming an Acquiring Person,  the Board
of Directors of the Company may redeem the Rights in whole,  but not in part, at
a price of $.001 per Right  (the  "Redemption  Price").  The  redemption  of the
Rights  may be made  effective  at  such  time,  on such  basis  and  with  such
conditions  as the Board of  Directors  in its sole  discretion  may  establish.
Immediately upon any redemption of the Rights,  the right to exercise the Rights
will  terminate  and the only right of the  holders of Rights will be to receive
the Redemption Price.

          Other than provisions  relating to certain principal economic terms of
the Rights,  the terms of the Rights may be amended by the Board of Directors of
the Company  without the  consent of the  holders of the  Rights,  including  an
amendment to lower the  threshold for  exercisability  of the Rights from 15% to
not less than 10%, with appropriate  exceptions for any person then beneficially
owning a percentage of the number of Common Shares then outstanding  equal to or
in excess of the new threshold, except that from and after the Distribution Date
no such  amendment  may  adversely  affect the  interests  of the holders of the
Rights. The Rights may also be amended to extend the expiration date thereof.

          Until a Right is exercised,  the holder thereof, as such, will have no
rights as a shareowner of the Company, including,  without limitation, the right
to vote or to receive dividends.

          The  Company  has  filed  a copy  of the  Rights  Agreement  with  the
Securities and Exchange Commission as an Exhibit to a Registration  Statement on
Form 8-A filed with  respect to the Rights.  A copy of the Rights  Agreement  is
also available free of charge from the Company.  This summary description of the
Rights does not  purport to be  complete  and is  qualified  in its  entirety by
reference  to the  Rights  Agreement,  which is  hereby  incorporated  herein by
reference.

                                       B-3



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