NIPSCO INDUSTRIES INC
8-A12B, 1999-02-16
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 12(g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                            NIPSCO INDUSTRIES, INC.
            (Exact Name of Registrant as Specified in its Charter)

                Indiana                                35-1719974
(State of Incorporation or Organization) (I.R.S. Employer Identification Number)

         801 East 86th Avenue
         Merrillville, Indiana                            46410
(Address of principal executive offices)                (Zip Code)



<TABLE>
<S>                                     <C>
If this Form relates to the             If this Form relates to the
registration of a class of debt         registration of a class of debt
securities and is effective upon        securities and is to become effective
filing pursuant to General              simultaneously with the effectiveness
Instruction A(c)(1) please check the    of a concurrent registration
following box. [ ]                      statement under the Securities Act of
                                        1933 pursuant to General Instruction
                                        A(c)(2) please check the following
                                        box. [ ]
</TABLE>



Securities Act registration number to which this form relates: 333-69279

Securities to be registered pursuant to Section 12(b) of the Act:
 
           Title of Each Class                  Name of Each Exchange on Which
           to be so Registered                  Each Class is to be Registered
           -------------------                  ------------------------------
 
Corporate Premium Income Equity Securities     The New York Stock Exchange, Inc.

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

                                     None
                               (Title of Class)

===============================================================================
<PAGE>
 
Item 1.  Description of Registrant's Securities to be Registered

     The class of securities to be registered hereby are the Corporate Premium
Income Equity Securities (the "Corporate PIES") of NIPSCO Industries, Inc., an
Indiana corporation.

     For a description of the Corporate PIES, reference is made to the
Prospectus Supplement dated February 9, 1999 to the Prospectus contained in the
Registration Statement on Form S-3 of NIPSCO Industries, Inc., NIPSCO Capital
Markets, Inc. and NIPSCO Capital Trust I (Registration Nos. 333-69279, 333-
69279-01 and 333-69279-02) (the "Form S-3"), which description is incorporated
herein by reference.
Item 2.  Exhibits
 
     1(a)  The Prospectus and the      Incorporated herein by reference to
           Prospectus Supplement       the filing made under Rule 424(b)(5)
                                       by NIPSCO Industries, Inc., NIPSCO
                                       Capital Markets, Inc. and NIPSCO
                                       Capital Trust I on February 11, 1999.
 
     4(a)  Certificate of Trust of     Incorporated herein by reference to
           NIPSCO Capital Trust I,     Exhibit 4.6 to the Form S-3.
           dated December 17, 1998
 
     4(b)  Declaration of Trust of     Incorporated herein by reference to
           NIPSCO Capital Trust I,     Exhibit 4.7 to the Form S-3.
           dated December 17, 1998
 
     4(c)  Indenture dated February    Incorporated herein by reference to
           14, 1997 among NIPSCO       Exhibit 4.1 to the Registration
           Capital Markets, Inc.,      Statement on Form S-3 filed by NIPSCO
           NIPSCO Industries, Inc.     Capital Markets, Inc. and NIPSCO
           and The Chase Manhattan     Industries, Inc. on February 25, 1997
           Bank, as Trustee            (Registration No. 333-22347).

     4(d)  First Supplemental 
           Indenture to the 
           Indenture dated 
           February 14, 1997 among 
           NIPSCO Capital Markets, 
           Inc., NIPSCO Industries, 
           Inc. and The Chase 
           Manhattan Bank, as 
           Trustee
<PAGE>
 
     4(e)  Form of Debenture

 
     4(f)  Form of Amended and         Incorporated herein by reference to 
           Restated Declaration of     Exhibit 4.8 to the Form S-3.
           Trust of NIPSCO Capital
           Trust I

     4(g)  Form of Certificate         Incorporated herein by reference to 
           Evidencing Preferred        Exhibit A to Exhibit 4.8 to the Form S-3.
           Securities of NIPSCO 
           Capital Trust I
 
     4(h)  Form of Guarantee           Incorporated herein by reference to 
           Agreement to be executed    Exhibit 4.5 to the Form S-3.
           and delivered by NIPSCO
           Capital Markets, Inc. and 
           The Chase Manhattan Bank, 
           as Trustee

     4(i)  Form of Purchase Contract   Incorporated herein by reference to 
           Agreement between NIPSCO    Exhibit 4.10 to the Form S-3.
           Industries, Inc. and The 
           Chase Manhattan Bank, as 
           Purchase Contract Agent

     4(j)  Form of Certificate         Incorporated herein by reference to 
           Evidencing Corporate PIES   Exhibit A to Exhibit 4.10 to the 
                                       Form S-3.

     4(k)  Form of Certificate         Incorporated herein by reference to 
           Evidencing Treasury PIES    Exhibit B to Exhibit 4.10 to the 
                                       Form S-3.
<PAGE>
 
     4(l)  Form of Pledge Agreement    Incorporated herein by reference to 
           among NIPSCO Industries,    Exhibit 4.11 to the Form S-3.
           Inc., The First National 
           Bank of Chicago, as 
           Collateral Agent and 
           Securities Intermediary,
           and The Chase Manhattan 
           Bank, as Purchase Contract 
           Agent

     4(m)  Support Agreement dated     Incorporated herein by reference to
           April 4, 1989 as amended    Exhibit 4.2 to the Registration
           as of May 15, 1989,         Statement on Form S-3 filed by NIPSCO
           December 10, 1990 and       between Capital Markets, Inc. and NIPSCO
           February 14, 1991 NIPSCO    Industries, Inc. on November 13, 1992
           Industries, Inc. and        (Registration No. 333-54516).
           NIPSCO Capital Markets, 
           Inc. 
 
 
<PAGE>
 
                                   SIGNATURE

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



                                                NIPSCO INDUSTRIES, INC.
                                                     (Registrant)


                                                By:   /s/ Dennis E. Senchak
                                                   -----------------------------
                                                          Dennis E. Senchak
                                                          Assistant Treasurer

<PAGE>
 
                                                                     EXHIBIT 4.1

                          FIRST SUPPLEMENTAL INDENTURE


          FIRST SUPPLEMENTAL INDENTURE, dated as of___________________________,
1999 (this "First Supplemental Indenture"), among NIPSCO Capital Markets, Inc.,
an Indiana corporation ("Capital Markets"), NIPSCO Industries, Inc., an Indiana
corporation ("Industries"), and The Chase Manhattan Bank, as trustee (the
"Trustee"), under the Indenture dated as of February 14, 1997 among Capital
Markets, Industries and the Trustee (the "Indenture").

          WHEREAS, Industries and Capital Markets executed and delivered the
Indenture to the Trustee to provide for the issuance from time to time of
Capital Markets' unsecured debentures, notes or other evidences of indebtedness
(collectively the "Securities," and individually, a "Security") to be issued in
one or more series as might be determined by Capital Markets under the
Indenture, in an unlimited aggregate principal amount which may be authenticated
and delivered as provided in the Indenture;

          WHEREAS, pursuant to the terms of the Indenture, Capital Markets
desires to provide for the establishment of a new series of Securities to be
known as the 5.90% Senior Debentures due 2005 (the "Debentures"), the form and
substance of such Debentures and the terms, provisions and conditions thereof to
be as set forth in the Indenture and this First Supplemental Indenture;

          WHEREAS, NIPSCO Capital Trust I, a Delaware statutory business trust
(the "Trust"), has offered to the public up to $345,000,000 in aggregate
liquidation amount of its 5.90% Trust Preferred Securities (the "Preferred
Securities") and, in connection therewith,  Capital Markets has agreed to
purchase up to $10,700,000 in aggregate liquidation amount of the Trust's common
securities (the "Common Securities" and, together with the Preferred Securities,
the "Trust Securities"), each representing an undivided beneficial interest in
the assets of the Trust, and proposes to invest the proceeds from such offerings
in up to $355,700,000 aggregate principal amount of the Debentures;

          WHEREAS, Capital Markets and Industries have requested that the
Trustee execute and deliver this First Supplemental Indenture, all requirements
necessary to make this First Supplemental Indenture a valid instrument in
accordance with its terms (and to make the Debentures, when executed by Capital
Markets and authenticated and delivered by the Trustee, the valid obligations of
Capital Markets) have been performed, and the execution and delivery of this
First Supplemental Indenture has been duly authorized in all respects;

          NOW, THEREFORE, in consideration of the purchase and acceptance of the
Debentures by the Holders thereof, and for the purpose of setting forth, as
provided in the Indenture, the form and substance of the Debentures and the
terms, provisions and conditions thereof, Capital Markets and Industries
covenant and agree with the Trustee as follows:
<PAGE>
 
                                   ARTICLE I
                                  DEFINITIONS

Section 1.1  Definition of Terms.

          Unless the context otherwise requires:

     (a)  a term not defined herein that is defined in the Indenture has the
          same meaning when used in this First Supplemental Indenture;

     (b)  a term defined anywhere in this First Supplemental Indenture has the
          same meaning throughout;

     (c)  the singular includes the plural and vice versa;

     (d)  a reference to a Section or Article is to a Section or Article of this
          First Supplemental Indenture;

     (e)  headings are for convenience of reference only and do not affect
          interpretation;

     (f)  the following terms have the meanings given to them in the
          Declaration: (i) Applicable Margin; (ii) Applicable Principal Amount;
          (iii) Delaware Trustee; (iv) Failed Remarketing; (v) Preferred
          Securities; (vi) Preferred Security Certificate; (vii) Property
          Trustee; (viii) Redemption Amount; (ix) Regular Trustees; (x)
          Remarketing Agreement; (xi) Remarketing Date; (xii) Treasury Portfolio
          Purchase Price; and (xiii) Two-Year Benchmark Treasury Rate;

     (g)  the following terms have the meanings given to them in the Purchase
          Contract Agreement:
          (i) Cash Settlement; (ii) Corporate PIES; (iii) Purchase Contract and
          (iv) Purchase Contract Settlement Date

     (h)  the following terms have the meanings given to them in this Section
          1.1(h):

          "Business Day" means any day other than a Saturday or Sunday or a day
on which banking institutions in New York City are authorized or required by law
or executive order to remain closed or a day on which the principal office of
the Trustee or the Property Trustee is closed for business.

          "Declaration" means the Amended and Restated Declaration of Trust of
the Trust, dated as of _______________________, 1999, as amended and restated 
from time to time.

          "Direct Action" has the meaning specified in Section 7.2.

          "Primary Treasury Dealer" means a primary U.S. government securities
dealer in New York City.

                                       2
<PAGE>
 
          "Purchase Contract Agreement" means the Purchase Contract Agreement
dated as of ______________________, 1999 between Industries and The Chase
Manhattan Bank, as Purchase Contract Agent.

          "Quotation Agent" means (i) Lehman Brothers Inc. and its respective
successors, provided that if Lehman Brothers Inc. ceases to be a Primary
Treasury Dealer, Capital Markets will substitute another Primary Treasury Dealer
therefor, or (ii) any other Primary Treasury Dealer selected by Capital Markets.

          "Redemption Amount" means, for each Debenture, the product of the
principal amount of such Debenture and a fraction, the numerator of which is the
Treasury Portfolio Purchase Price and the denominator of which is the Applicable
Principal Amount.

          "Redemption Price" means, for each Debenture, the sum of the
Redemption Amount plus accrued and unpaid interest thereon to the Tax Event
Redemption Date.

          "Remarketing" means (i) as long as the Trust has not been liquidated,
the operation of the procedures for remarketing specified in Section 7.13 of the
Declaration and (ii) if the Trust has been liquidated, the operation of the
procedures for remarketing specified in Article VIII.

          "Remarketing Agent" shall mean Lehman Brothers Inc. or any successor
remarketing agent selected by Capital Markets.

          "Reset Rate" means the rate per annum that results from the
remarketing of the Preferred Securities that are a part of the Corporate PIES as
to which the holders have not given notice of their election to settle the
related Purchase Contracts with cash, or have given such notice but failed to
deliver cash, and the Preferred Securities that are not a part of the Corporate
PIES as to which the holders have requested remarketing.

          "Tax Event" means the receipt by Capital Markets and the Trust of an
opinion of counsel, rendered by a law firm having a recognized national tax
practice, to the effect that, as a result of any amendment to, change in or
announced proposed change in the laws (or any regulations thereunder) of the
United States or any political subdivision or taxing authority thereof or
therein, or as a result of any official administrative decision, pronouncement,
judicial decision or action interpreting or applying such laws or regulations,
which amendment or change is effective or which proposed change, pronouncement,
action or decision is announced on or after the date of issuance of the
Preferred Securities, there is more than an insubstantial risk that (i) the
Trust is, or within 90 days of the date of such opinion will be, subject to
United States federal income tax with respect to income received or accrued on
the Debentures, (ii) interest payable by Capital Markets on the Debentures is
not, or within 90 days of the date of such opnion, will not be, deductible by
Capital Markets, in whole or in part, for United States federal income tax
purposes, or (iii) the Trust is, or within 90 days of the date of such opinion
will be, subject to more than a de minimis amountof other taxes, duties or other
governmental charges.

          "Tax Event Redemption Date" has the meaning specified in Section
2.5(a).

          "Treasury Portfolio" means, with respect to the Applicable Principal
Amount of Debentures (i) if the Tax Event Redemption Date occurs prior to the
Purchase Contract Settlement Date, a portfolio of zero-coupon U.S. Treasury
Securities consisting of (a) principal or interest strips of U.S. Treasury
Securities that mature on or prior to the Purchase Contract Settlement Date in
an aggregate amount at maturity equal

                                       3
<PAGE>
 
to the Applicable Principal Amount and (b) with respect to each scheduled
interest payment date on the Debentures that occurs after the Tax Event
Redemption Date, principal or interest strips of U.S. Treasury Securities that
mature on or prior to such date in an aggregate amount at maturity equal to the
aggregate interest payment that would be due on the Applicable Principal Amount
of the Debentures on such date and (ii) if the Tax Event Redemption Date occurs
after the Purchase Contract Settlement Date, a portfolio of zero-coupon U.S.
Treasury Securities consisting of (a) principal or interest strips of U.S.
Treasury Securities that mature on or prior to February 19, 2005, in an
aggregate amount at maturity equal to the Applicable Principal Amount and (b)
with respect to each scheduled interest payment date on the Debentures that
occurs after the Tax Event Redemption Date, principal or interest strips of such
U.S. Treasury Securities that mature on or prior to such date in an aggregate
amount at maturity equal to the aggregate interest payment that would be due on
the Applicable Principal Amount of the Debentures on such date.

                                   ARTICLE II
                     TERMS AND CONDITIONS OF THE DEBENTURES

Section 2.1  Designation and Principal Amount.

          There is hereby authorized a series of Securities designated the
"5.90% Senior Debentures due 2005," limited in aggregate principal amount to
$355,700,000.

Section 2.2  Maturity.

          The Stated Maturity will be February 19, 2005.

Section 2.3  Global Debentures.

          If distributed to holders of Preferred Securities in connection with
the involuntary or voluntary dissolution of the Trust:

          (a)  The Debentures in certificated form may be presented to the
Trustee by the Property Trustee in exchange for a Global Security in an
aggregate principal amount equal to all Outstanding Debentures (a "Global
Debenture"). The Depositary for the Debentures will be The Depository Trust
Company. The Global Debentures will be registered in the name of the Depositary
or its nominee, Cede & Co., and delivered by the Trustee to the Depositary or a
custodian appointed by the Depositary for crediting to the accounts of its
participants pursuant to the instructions of the Regular Trustees. Capital
Markets upon any such presentation shall execute a Global Debenture in such
aggregate principal amount and deliver the same to the Trustee for
authentication and delivery in accordance with the Indenture and this First
Supplemental Indenture. Payments on the Debentures issued as a Global Debenture
will be made to the Depositary or its nominee.

          (b)  If any Preferred Securities are held in non book-entry
certificated form, the Debentures in certificated form may be presented to the
Trustee by the Property Trustee, and any Preferred Security Certificate which
represents Preferred Securities other than Preferred Securities held by the
depositary for the Preferred Securities or its nominee ("Non Book-Entry
Preferred Securities") will be deemed to represent beneficial interests in
Debentures presented to the Trustee by the Property Trustee having an aggregate
principal amount equal to the aggregate liquidation amount of the Non Book-Entry
Preferred Securities until such Preferred Security Certificates are presented to
the Security Registrar for 

                                       4
<PAGE>
 
transfer or reissuance, at which time such Preferred Security Certificates will
be canceled and a Debenture registered in the name of the holder of the
Preferred Security Certificate or the transferee of the holder of such Preferred
Security Certificate, as the case may be, with an aggregate principal amount
equal to the aggregate liquidation amount of the Preferred Security Certificate
canceled will be executed by Capital Markets and delivered to the Trustee for
authentication and delivery in accordance with the Indenture and this First
Supplemental Indenture. On issue of such Debentures, Debentures with an
equivalent aggregate principal amount that were presented by the Property
Trustee to the Trustee will be deemed to have been canceled.
 
Section 2.4  Interest.

     (a)     Each Debenture will bear interest at the rate of 5.90% per annum
from February 16, 1999 until the Purchase Contract Settlement Date, and at the
Reset Rate thereafter, payable quarterly in arrears on the Interest Payment
Dates, which shall be February 19, May 19, August 19 and November 19 of each
year, commencing May 19, 1999.

     (b)     The Regular Record Dates for the Debentures shall be (i) as long as
the Debentures are represented by a Global Debenture, the Business Day preceding
each Interest Payment Date or (ii) if the Debentures are issued in certificated
form, the 15th Business Day prior to each Interest Payment Date.

     (c)     The interest rate on the Debentures outstanding on and after the
Purchase Contract Settlement Date will be reset on the third Business Day
preceding the Purchase Contract Settlement Date to the Reset Rate. The Reset
Rate will be equal to the rate per annum that results from the Remarketing,
provided that if a Failed Remarketing occurs, the Reset Rate will be equal to
(i) the Two-Year Benchmark Treasury Rate plus (ii) the Applicable Margin.

     (d)     The amount of interest payable on the Debentures for any period
will be computed (i) for any full quarterly period on the basis of a 360-day
year of twelve 30-day months and (ii) for any period shorter than a full
quarterly period, on the basis of a 30-day month and, for any period less than a
month, on the basis of the actual number of days elapsed per 30-day month. In
the event that any date on which interest is payable on the Debentures is not a
Business Day, then payment of the interest payable on such date will be made on
the next day that is a Business Day (and without interest or other payment in
respect of any such delay), except that, if such Business Day is in the next
calendar year, then such payment will be made on the preceding Business Day.

Section 2.5  Redemption.

     (a)     If a Tax Event occurs and is continuing, Capital Markets may, at
its option and upon not less than 30 nor more than 60 days' notice to the
Holders of the Debentures, redeem the Debentures in whole (but not in part)
within 90 days following the occurrence of such Tax Event, at a price equal to,
for each Debenture, the Redemption Price. The Redemption Amount shall be paid
prior to 12:00 noon, New York City time, on the date of redemption (the "Tax
Event Redemption Date") or such earlier time as Capital Markets determines,
provided that Capital Markets shall have deposited with the Trustee an amount
sufficient to pay the Redemption Amount by 10:00 a.m. on the Tax Event
Redemption Date. Such redemption shall otherwise be in accordance with the
provisions of Article Eleven of the Indenture.

                                       5
<PAGE>
 
     (b)  Except as provided in Section 2.5(a), Capital Markets will have no
right to redeem the Debentures.

     (c)  The Debentures will not be subject to a sinking fund provision.

Section 2.6  Events of Default.

          It shall be an Event of Default with respect to the Debentures if the
Trust shall have voluntarily or involuntarily dissolved, wound up its business
or otherwise terminated its existence except in connection with (i) the
distribution of the Securities held by the Trust to the holders of the Trust
Securities in liquidation of their interests in the Trust, (ii) the redemption
of all of the outstanding Trust Securities or (iii) a consolidation, conversion,
amalgamation, merger or other transaction involving the Trust that is permitted
under Section 3.15 of the Declaration.

Section 2.7  Paying Agent; Security Registrar.

          If the Debentures are issued in certificated form, the Paying Agent
and the Security Registrar for the Debentures shall be the Corporate Trust
Office.

                                  ARTICLE III
                               FORM OF DEBENTURE

SECTION 3.1.  Form of Debenture.

          The Debentures and the Trustee's Certificate of Authentication to be
endorsed thereon are to be substantially in the following forms:

                          (FORM OF FACE OF DEBENTURE)

[IF THE DEBENTURE IS TO BE A GLOBAL DEBENTURE, INSERT:  This Debenture is a
Global Security within the meaning of the Indenture hereinafter referred to and
is registered in the name of The Depository Trust Company, a New York
corporation (the "Depositary"), or a nominee of the Depositary. This Debenture
is exchangeable for Debentures registered in the name of a person other than the
Depositary or its nominee only in the limited circumstances described in the
Indenture, and no transfer of this Debenture (other than a transfer of this
Debenture as a whole by the Depositary to a nominee of the Depositary or by a
nominee of the Depositary to the Depositary or another nominee of the
Depositary) may be registered except in limited circumstances.

Unless this Debenture is presented by an authorized representative of the
Depositary to the issuer or its agent for registration of transfer, exchange or
payment, and any Debenture issued is registered in the name of Cede & Co. or
such other name as requested by an authorized representative of the Depositary,
and any payment hereon is made to Cede & Co., or to such other entity as is
requested by an authorized representative of the Depositary), and, except as
otherwise provided in the Indenture, ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered
owner hereof, Cede & Co., has an interest herein.]

No._______________

                                       6
<PAGE>
 
$_________________
CUSIP No. 654638 AC9
          ----------


                        5.90% SENIOR DEBENTURE DUE 2005

NIPSCO Capital Markets, Inc., an Indiana corporation ("Capital Markets", which
term includes any successor corporation under the Indenture hereinafter referred
to), for value received, hereby promises to pay to ______________________, or
registered assigns, the principal sum of _______ Dollars on __________________,
2005, and to pay interest on said principal sum from February 16, 1999, or from
the most recent interest payment date (each such date, an "Interest Payment
Date") to which interest has been paid or duly provided for, quarterly in
arrears on February 19, May 19, August 19 and November 19 of each year
commencing May 19, 1999, at the rate of 5.90% per annum until February 19, 2003,
and at the Reset Rate thereafter, until the principal hereof shall have become
due and payable, and on any overdue principal and premium, if any, and (without
duplication and to the extent that payment of such interest is enforceable under
applicable law) on any overdue installment of interest at the same rate per
annum compounded quarterly.  The amount of interest payable for any period will
be computed (1) for any full quarterly period on the basis of a 360-day year of
twelve 30-day months and (2) for any period shorter than a full quarterly
period, on the basis of a 30-day month and, for any period less than a month, on
the basis of the actual number of days elapsed per 30-day month.  In the event
that any date on which interest is payable is not a Business Day, then payment
of the interest payable on such date will be made on the next day that is a
Business Day (and without any interest or other payment in respect of such
delay), except that, if such Business Day is in the next calendar year, then
such payment will be made on the preceding Business Day.  The interest
installment so payable, and punctually paid or duly provided for, on any
Interest Payment Date will, as provided in the Indenture referred to on the
reverse side hereof, be paid to the person in whose name this Debenture (or one
or more Predecessor Securities, as defined in said Indenture) is registered at
the close of business on the Regular Record Date for such interest installment,
which, if this Debenture is a Global Security, shall be the close of business on
the Business Day preceding such Interest Payment Date or, if this Debenture is
not a Global Security, shall be the close of business on the 15th Business Day
preceding such Interest Payment Date; provided that interest paid at maturity
shall be paid to the Person to whom principal is paid.  Any such interest
installment not punctually paid or duly provided for shall forthwith cease to be
payable to the registered Holder on such Regular Record Date and may be paid to
the Person in whose name this Debenture (or one or more Predecessor Securities)
is registered at the close of business on a special record date to be fixed by
the Trustee referred to on the reverse side hereof for the payment of such
defaulted interest, notice whereof shall be given to the registered Holders of
the Debentures not less than 10 days prior to such special record date, or may
be paid at any time in any other lawful manner not inconsistent with the
requirements of any securities exchange on which the Debentures may be listed,
and upon such notice as may be required by such exchange, all as more fully
provided in the Indenture.  The principal of and interest on this Debenture
shall be payable at the office or agency of the Trustee maintained for that
purpose in any coin or currency of the United States of America that at the time
of payment is legal tender for payment of public and private debts; provided,
however, that payment of interest may be made at the option of Capital Markets
by check mailed to the registered Holder at such address as shall appear in the
Security Register. Notwithstanding the foregoing, so long as the Holder of this
Debenture is the Property Trustee, the payment of the principal of (and premium,
if any) and interest on this Debenture will be made at such place and to such
account as may be designated by the Property Trustee.

                                       7
<PAGE>
 
This Debenture is, to the extent provided in the Indenture, senior and unsecured
and will rank in right of payment on a parity with all other senior unsecured
obligations of Capital Markets.

Unless the Certificate of Authentication hereon has been executed by the
Trustee, this Debenture shall not be entitled to any benefit under the Indenture
or be valid or obligatory for any purpose.  The provisions of this Debenture are
continued on the reverse side hereof, and such continued provisions shall for
all purposes have the same effect as though fully set forth at this place.

                                       8
<PAGE>
 
          IN WITNESS WHEREOF, Capital Markets has caused this instrument to be
executed.


                                            NIPSCO CAPITAL MARKETS, INC.


                                            By:_________________________________


Attest:


By:______________________________
     Secretary


                    (FORM OF CERTIFICATE OF AUTHENTICATION)
                         CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series referred to in the within-mentioned
Indenture.


Dated:__________________________________    THE CHASE MANHATTAN BANK, as Trustee


                                            By:_________________________________
                                                  Authorized Officer

                                       9
<PAGE>
 
                         (FORM OF REVERSE OF DEBENTURE)

This Debenture is one of a duly authorized series of Securities of Capital
Markets (herein sometimes referred to as the "Debentures"), all issued under and
pursuant to an Indenture dated as of February 14, 1997, duly executed and
delivered among NIPSCO Industries, Inc. ("Industries"), NIPSCO Capital Markets,
Inc. ("Capital Markets") and The Chase Manhattan Bank, as Trustee (the
"Trustee"), as supplemented by the First Supplemental Indenture thereto dated as
of _________________________, 1999, among Industries, Capital Markets and the
Trustee (such Indenture as so supplemented, the "Indenture"), to which Indenture
and all indentures supplemental thereto reference is hereby made for a
description of the rights, limitations of rights, obligations, duties and
immunities thereunder of the Trustee, Capital Markets, Industries and the
Holders of the Debentures. By the terms of the Indenture, the Securities are
issuable in series that may vary as to amount, date of maturity, rate of
interest and in other respects as provided in the Indenture. This series of
Securities is limited in aggregate principal amount to $355,700,000.

All terms used in this Debenture that are defined in the Indenture shall have
the meanings assigned to them in the Indenture.

If a Tax Event occurs and is continuing, Capital Markets may, at its option and
upon not less than 30 nor more than 60 days' notice to the Holders of the
Debentures, redeem the Debentures in whole (but not in part) within 90 days
following the occurrence of such Tax Event at the Redemption Price. The
Redemption Price shall be paid prior to 12:00 noon, New York City time, on the
Tax Event Redemption Date, by check or wire transfer in immediately available
funds at such place and to such account as may be designated by each such
Holder.

The Debentures will not be subject to a sinking fund provision.

In case an Event of Default shall have occurred and be continuing, the principal
of all of the Debentures may be declared, and upon such declaration shall
become, due and payable, in the manner, with the effect and subject to the
conditions provided in the Indenture.

The Indenture contains provisions permitting Capital Markets and the Trustee,
with the consent of the Holders of not less than a majority in aggregate
principal amount of the Debentures and all other series of Securities affected
at the time Outstanding, as defined in the Indenture, to execute supplemental
indentures for the purpose of adding any provisions to or changing in any manner
or eliminating any of the provisions of the Indenture or of any supplemental
indenture or of modifying in any manner the rights of the Holders of the
Debentures; provided, however, that no such supplemental indenture may, without
the consent of the Holder of each outstanding Debenture, among other things, (i)
change the stated maturity of the principal of, or any installment of interest
on, any Debenture, (ii) reduce the principal amount of, or the rate of interest
on or any premium payable upon the redemption of, the Debentures, (iii) impair
the right to institute suit for the enforcement of any such payment on or after
the stated maturity of or any redemption date for the Debentures or (iv) reduce
the above-stated percentage of principal amount of Debentures, the Holders of
which are required to modify or amend the Indenture, to consent to any waiver
thereunder or to approve any supplemental indenture. The Indenture also contains
provisions permitting the Holders of a majority in aggregate principal amount of
the Debentures at the time outstanding affected thereby, on behalf of all of the
Holders of the Debentures, to waive any past default in the performance of any
of the covenants contained in the Indenture, or established pursuant to the
Indenture with respect to the Debentures, and its consequences, except a default
in the payment of the principal of or interest on any of the Debentures (unless
                                       10
<PAGE>
 
cured as provided in the Indenture) or in respect of a covenant or provision
that cannot be modified or amended without the consent of the Holders of each
Debenture then outstanding. Any such consent or waiver by the registered Holder
of this Debenture (unless revoked as provided in the Indenture) shall be
conclusive and binding upon such Holder and upon all future Holders and owners
of this Debenture and of any Debenture issued in exchange herefor or in place
hereof (whether by registration of transfer or otherwise), irrespective of
whether or not any notation of such consent or waiver is made upon this
Debenture.

No reference herein to the Indenture and no provision of this Debenture or of
the Indenture shall alter or impair the obligation of Capital Markets, which is
absolute and unconditional, to pay the principal of and premium, if any, and
interest on this Debenture at the time and place and at the rate and in the
money herein prescribed.

As provided in the Indenture and subject to certain limitations therein set
forth, this Debenture is transferable by the registered Holder hereof on the
Security Register of Capital Markets, upon surrender of this Debenture for
registration of transfer at the office or agency of Capital Markets in the City
and State of New York accompanied by a written instrument or instruments of
transfer in form satisfactory to Capital Markets or the Trustee duly executed by
the registered Holder hereof or his attorney duly authorized in writing, and
thereupon one or more new Debentures of authorized denominations and for the
same aggregate principal amount will be issued to the designated transferee or
transferees. No service charge will be made for any such transfer, but Capital
Markets may require payment of a sum sufficient to cover any tax or other
governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Debenture, Capital
Markets, the Trustee, any paying agent and any Security Registrar may deem and
treat the registered holder hereof as the absolute owner hereof (whether or not
this Debenture shall be overdue and notwithstanding any notice of ownership or
writing hereon made by anyone other than the Security Registrar) for the purpose
of receiving payment of or on account of the principal hereof and premium, if
any, and interest due hereon and for all other purposes, and neither Capital
Markets nor the Trustee nor any paying agent nor any Security Registrar shall be
affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on
this Debenture, or for any claim based hereon, or otherwise in respect hereof,
or based on or in respect of the Indenture, against any incorporator,
stockholder, officer or director, past, present or future, as such, of Capital
Markets or of any predecessor or successor corporation, whether by virtue of any
constitution, statute or rule of law, or by the enforcement of any assessment or
penalty or otherwise, all such liability being, by the acceptance hereof and as
part of the consideration for the issuance hereof, expressly waived and
released.

The Indenture imposes certain limitations on the ability of Capital Markets and
Industries to, among other things, merge, consolidate or sell, assign, transfer
or lease all or substantially all of its properties or assets. Such covenants
and limitations are subject to a number of important qualifications and
exceptions. Capital Markets and Industries must report periodically to the
Trustee on compliance with the covenants in the Indenture.

The Debentures of this series are issuable only in registered form without
coupons in denominations of $50 and any integral multiple thereof. As provided
in the Indenture and subject to certain limitations herein and therein set
forth, Debentures of this series so issued are exchangeable for a like aggregate
principal amount
                                       11
<PAGE>
 
of Debentures of this series of a different authorized denomination, as
requested by the Holder surrendering the same.

                                   ARTICLE IV
                                    EXPENSES

Section 4.1  Payment of Expenses.

          In connection with the offering, sale and issuance of the Debentures
to the Trust in connection with the sale of the Preferred Securities by the
Trust, Capital Markets will:

          (a) pay for all costs and expenses relating to the offering, sale and
issuance of the Debentures, including compensation to the underwriters payable
pursuant to the Underwriting Agreement and compensation of the Trustee under the
Indenture in accordance with the provisions of Section 607 of the Indenture; and

          (b) pay for all costs and expenses of the Trust, including, but not
limited to, costs and expenses relating to the organization of the Trust, the
offering, sale and issuance of the Trust Securities (including compensation to
the underwriters payable pursuant to the Underwriting Agreement in connection
therewith); the fees and expenses of the Property Trustee (including, without
limitation, those incurred in connection with the enforcement by the Property
Trustee of the rights of the holders of the Preferred Securities), the Delaware
Trustee and the Regular Trustees; the costs and expenses relating to the
operation of the Trust (including, without limitation, costs and expenses of
accountants, attorneys, statistical or bookkeeping services, expenses for
printing and engraving and computing or accounting equipment, paying agent(s),
registrar(s), transfer agent(s), duplicating, travel and telephone and other
telecommunications expenses); and costs and expenses incurred in connection with
the acquisition, financing and disposition of Trust assets;

          (c) be primarily liable for any indemnification obligations arising
with respect to the Declaration; and

          (d) pay any and all taxes (other than United States withholding taxes
attributable to the Trust or its assets) and all liabilities, costs and expenses
with respect to such taxes of the Trust.


                                   ARTICLE V
                                   COVENANTS

Section 5.1  Covenant to List on Exchange.

          If the Debentures are distributed to the holders of the Preferred
Securities upon dissolution of the Trust, Industries and Capital Markets will
use their best efforts to list such Debentures on the New York Stock Exchange or
on such other exchange as the Preferred Securities are then listed.

                                       12
<PAGE>
 
Section 5.2  Covenants in the Event of an Event of Default.

          If an Event of Default occurs and written notice of such event has
been given to Capital Markets, then neither Capital Markets nor Industries may:

          (a) declare or pay any dividends or distributions on, or redeem,
purchase, acquire, or make a liquidation payment with respect to, any of its
capital stock; or

          (b) make any payment of principal, interest or premium, if any, on or
repay, repurchase or redeem any debt securities that rank on a parity with or
junior in interest to the Debentures or make any guarantee payments with respect
to any guarantee of the debt securities of any subsidiary of Capital Markets or
Industries if such guarantee ranks on a parity with or junior in interest to the
Debentures;

other than (i) purchases or acquisitions of capital stock of Capital Markets or
Industries in connection with the satisfaction by Capital Markets or Industries
of its obligations under any employee benefit plans or the satisfaction by
Capital Markets or Industries of its obligations pursuant to any contract or
security outstanding on the date of such event requiring Capital Markets or
Industries to purchase capital stock of Capital Markets or Industries, (ii) as a
result of a reclassification of Capital Markets' or Industries' capital stock
for another class or series of Capital Markets' or Industries' capital stock,
(iii) the purchase of fractional interests in shares of Capital Markets' or
Industries' capital stock pursuant to the conversion or exchange provisions of
such capital stock or the security being converted or exchanged, (iv) dividends
or distributions in capital stock of Capital Markets or Industries, (v)
redemptions or repurchases of any rights pursuant to a rights agreement and (vi)
payments under the Guarantee.

Section 5.3  Additional Covenants Relating to the Trust.

          For as long as the Preferred Securities remain outstanding, Capital
Markets will:

          (a) maintain, directly or indirectly, 100% ownership of the Common
Securities;

          (b) cause the Trust to remain a statutory business trust and not to
voluntarily dissolve, wind up, liquidate or be terminated, except as permitted
by the Declaration;

          (c) use its commercially reasonable efforts to ensure that the Trust
will not be an "investment company" required to be registered under the
Investment Company Act of 1940;

          (d) not take any action that would be reasonably likely to cause the
Trust to be classified as an association or a publicly traded partnership
taxable as a corporation for United States federal income tax purposes; and

          (e) pay all of the debts and obligations of the Trust (other than with
respect to the securities issued by the Trust) and all costs and expenses of the
Trust (including, but not limited to, all costs and expenses relating to the
organization of the Trust, the fees and expenses of the trustees and all costs
and expenses relating to the operation of the Trust) and any and all taxes,
duties, assessments or governmental charges of whatever nature (other than
withholding taxes) imposed on the Trust by the United States, or any other
taxing authority, so that the net amounts received and retained by the Trust
after paying such expenses 

                                       13
<PAGE>
 
will be equal to the amounts the Trust would have received had no such costs or
expenses been incurred by or imposed on the Trust. The obligations of Capital
Markets in Section 5.35(e) are for the benefit of, and shall be enforceable by,
any Person to whom any such debts, obligations, costs, expenses and taxes are
owed whether or not such Person has received notice thereof. Any such Person may
enforce such obligations of Capital Markets directly against Capital Markets,
and Capital Markets irrevocably waives any right or remedy to require that any
such Person take any action against the Trust or any other Person before
proceeding against Capital Markets.

                                   ARTICLE VI
                          ORIGINAL ISSUE OF DEBENTURES

Section 6.1  Original Issue of Debentures.

          Debentures in an aggregate principal amount of up to $355,700,000 may,
upon execution of this First Supplemental Indenture, be executed by Capital
Markets and delivered to the Trustee for authentication, and the Trustee shall
thereupon authenticate and deliver said Debentures upon receipt of a Company
Order, without any further action by Industries or Capital Markets.


                                  ARTICLE VII
                   RIGHTS OF HOLDERS OF PREFERRED SECURITIES

Section 7.1  Preferred Security Holders' Rights.

          Notwithstanding Section 507 of the Indenture, if the Property Trustee
fails to enforce its rights under the Debentures after a holder of Preferred
Securities has made a written request, the holder of Preferred Securities may,
to the fullest extent permitted by law, institute a legal proceeding directly
against Capital Markets to enforce the Property Trustee's rights under the
Indenture without first instituting any legal proceeding against the Property
Trustee or any other person or entity.

Section 7.2  Direct Action.

          Notwithstanding any other provision of the Indenture, for as long as
any Preferred Securities remain outstanding, to the fullest extent permitted by
law, if an Event of Default has occurred and is continuing and such event is
attributable to the failure of Capital Markets to pay interest or principal on
the Debentures on the date such interest or principal is otherwise payable (or
in the case of redemption, the redemption date), then a holder of Preferred
Securities may institute a proceeding directly against Capital Markets (a
"Direct Action") to enforce payment to such holder of the principal or interest
on Debentures having an aggregate principal amount equal to the aggregate
liquidation amount of the Preferred Securities of such holder.

Section 7.3  Payments Pursuant to Direct Actions.

          Capital Markets will have the right to set off against its obligations
to the Trust, as Holder of the Debentures, any payment made to a holder of
Preferred Securities in connection with a Direct Action.

                                       14
<PAGE>
 
                                  ARTICLE VIII
                                  REMARKETING

Section 8.1  Effectiveness of this Article.

          This Article VIII will become effective only upon a distribution of
the Debentures upon dissolution of the Trust which occurs prior to the
Remarketing of the Preferred Securities pursuant to the Declaration. Until such
a distribution, or if such distribution occurs after the Remarketing of the
Preferred Securities pursuant to the Declaration, this Article VIII will have no
effect.

Section 8.2  Remarketing.

          (a) Capital Markets shall request, not later than 15 nor more than 30
calendar days prior to the Remarketing Date, that the Depositary notify the
Holders of the Debentures and the holders of the Corporate PIES and the Treasury
PIES of the Remarketing and of the procedures that must be followed if a Holder
of Debentures wishes to make a Cash Settlement.

          (b) Not later than 5:00 p.m., New York City time, on the seventh
Business Day preceding the Purchase Contract Settlement Date, each Holder of
Debentures may elect to have the Debentures held by such Holder remarketed in
the Remarketing. Under Section 5.4 of the Purchase Contract Agreement, holders
of Corporate PIES that do not give notice of their intention to make a Cash
Settlement of the Purchase Contract component of their Corporate PIES prior to
such time in the manner specified in such Section, or that give such notice but
fail to deliver cash prior to 11:00 a.m., New York City time, on or prior to the
fifth Business Day preceding the Purchase Contract Settlement Date, shall be
deemed to have consented to the disposition of the Debenture component of their
Corporate PIES in the Remarketing. Holders of Debentures that are not a
component of Corporate PIES wishing to have their Debentures remarketed shall
give to the Purchase Contract Agent notice of their election prior to 11:00
a.m., New York City time, on such fifth Business Day. Any such notice shall be
irrevocable and may not be conditioned upon the level at which the Reset Rate is
established in the Remarketing. Promptly after 11:00 a.m., New York City time,
on such fifth Business Day, the Purchase Contract Agent, based on the notices
received by it prior to such time (including notices from the Purchase Contract
Agent as to Purchase Contracts for which Cash Settlement has been elected and
cash received), shall notify Capital Markets and the Remarketing Agent of the
amount of Debentures to be tendered for purchase in the Remarketing.

          (c) If any Holder of Debentures does not give a notice of its
intention to make a Cash Settlement or gives such notice but fails to deliver
cash as described in the foregoing subsection (b), or gives a notice of election
to have Debentures that are not a component of Corporate PIES remarketed, then
the Debentures of such Holder shall be deemed tendered for purchase in the
Remarketing, notwithstanding any failure by such Holder to deliver or properly
deliver such Preferred Securities to the Remarketing Agent for purchase.

          (d) The right of each Holder to have Debentures tendered for purchase
will be limited to the extent that (i) the Remarketing Agent conducts a
remarketing pursuant to the terms of the Remarketing Agreement, (ii) the
Debentures tendered have not been called for redemption, (iii) the Remarketing
Agent is able to find a purchaser or purchasers for the tendered Debentures and
(iv) such purchaser or purchasers deliver the purchase price therefor to the
Remarketing Agent.

                                       15
<PAGE>
 
          (e) On the Remarketing Date, the Remarketing Agent will use
commercially reasonable efforts to remarket, at a price equal to 100% of the
aggregate principal amount thereof, the Debentures tendered or deemed tendered
for purchase.

          (f) If, as a result of the efforts described in the foregoing
subsection (e), the Remarketing Agent determines that it will be able to
remarket all of the Debentures tendered or deemed tendered for purchase at a
price of 100% of their aggregate principal amount prior to 4:00 p.m., New York
City time, on the Remarketing Date, the Remarketing Agent shall determine the
Reset Rate, which shall be the rate per annum (rounded to the nearest one-
thousandth (0.001) of one percent per annum) that the Remarketing Agent
determines, in its sole judgment, to be the lowest rate per annum that will
enable it to remarket all of the Debentures tendered or deemed tendered for
Remarketing.

          (g) If none of the Holders of the Debentures or the holders of the
Corporate PIES elects to have Debentures remarketed in the Remarketing, the
Reset Rate shall be the rate determined by the Remarketing Agent, in its sole
discretion, as the rate that would have been established had a Remarketing been
held on the Remarketing Date.

          (h) If, by 4:00 p.m., New York City time, on the Remarketing Date, the
Remarketing Agent is unable to remarket all of the Debentures tendered or deemed
tendered for purchase, a "Failed Remarketing" shall be deemed to have occurred
and the Remarketing Agent shall so advise by telephone the Depositary, the
Property Trustee, the Debenture Trustee and Capital Markets.  In the event of a
Failed Remarketing, the Reset Rate shall equal the Two-Year Benchmark Treasury
plus the Applicable Margin.

          (i) By approximately 4:30 p.m., New York City time, on the Remarketing
Date, provided that there has not been a Failed Remarketing, the Remarketing
Agent shall advise, by telephone (i) the Depositary, the Property Trustee, the
Debenture Trustee and Capital Markets of the Reset Rate determined in the
Remarketing and the amount of Debentures sold in the Remarketing, (ii) each
purchaser (or the Depositary participant thereof) of the Reset Rate and the
amount of Debentures such purchaser is to purchase and (iii) each purchaser to
give instructions to its Depositary participant to pay the purchase price on the
Purchase Contract Settlement Date in same day funds against delivery of the
Debentures purchased through the facilities of the Depositary.

          (j) In accordance with the Depositary's normal procedures, on the
Purchase Contract Settlement Date, the transactions described above with respect
to each Debenture tendered for purchase and sold in the Remarketing shall be
executed through the Depositary, and the accounts of the respective Depositary
participants shall be debited and credited and such Debentures delivered by
book-entry as necessary to effect purchases and sales of such Debentures.  The
Depositary shall make payment in accordance with its normal procedures.

          (k) If any Holder of Debentures selling Debentures in the Remarketing
fails to deliver such Debentures, the Depositary participant of such selling
holder and of any other Person that was to have purchased Debentures in the
Remarketing may deliver to any such other Person an amount of Debentures that is
less than the amount of Debentures that otherwise was to be purchased by such
Person.  In such event, the amount of Debentures to be so delivered shall be
determined by such Depositary participant, and delivery of such lesser amount of
Debentures shall constitute good delivery.

                                       16
<PAGE>
 
          (l) The Remarketing Agent is not obligated to purchase any Debentures
that otherwise would remain unsold in the Remarketing.  Neither the Capital
Markets nor the Remarketing Agent shall be obligated in any case to provide
funds to make payment upon tender of the Debentures for Remarketing.

          (m) Under the Remarketing Agreement, Capital Markets, in its capacity
as issuer of the Debentures, shall be liable for, and shall pay, any and all
costs and expenses incurred in connection with the Remarketing.

          (n) The tender and settlement procedures set in this Section 8.2,
including provisions for payment by purchasers of the Debentures in the
Remarketing, shall be subject to modification to the extent required by the
Depositary or if the book-entry system is no longer available for the Debentures
at the time of the Remarketing, to facilitate the tendering and remarketing of
the Debentures in certificated form. In addition, the Remarketing Agent may
modify the settlement procedures set forth herein in order to facilitate the
settlement process.

                                   ARTICLE IX
                                 MISCELLANEOUS

SECTION 9.1.   Ratification of Indenture.

          The Indenture, as supplemented by this First Supplemental Indenture,
is in all respects ratified and confirmed, and this First Supplemental Indenture
shall be deemed part of the Indenture in the manner and to the extent herein and
therein provided.

SECTION 9.2.   Trustee Not Responsible for Recitals.

          The recitals herein contained are made by Industries and Capital
Markets and not by the Trustee, and the Trustee assumes no responsibility for
the correctness thereof.  The Trustee makes no representation as to the validity
or sufficiency of this First Supplemental Indenture.

SECTION 9.3.   Governing Law.

          This First Supplemental Indenture and each Debenture shall be deemed
to be a contract made under the internal laws of the State of New York and for
all purposes shall be construed in accordance with the laws of said State.

SECTION 9.4.   Severability.

          In case any one or more of the provisions contained in this First
Supplemental Indenture or in the Debentures shall for any reason be held to be
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this First
Supplemental Indenture or of the Debentures, but this First Supplemental
Indenture and the Debentures shall be construed as if such invalid or illegal or
unenforceable provision had never been contained herein or therein.

                                       17
<PAGE>
 
SECTION 9.5.   Counterparts.

          This First Supplemental Indenture may be executed in any number of
counterparts each of which shall be an original; but such counterparts shall
together constitute but one and the same instrument.

                                       
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be duly executed, and their respective corporate seals
to be hereunto affixed and attested, on the date or dates indicated in the
acknowledgments and as of the day and year first above written.

                                    NIPSCO INDUSTRIES, INC.



                                    By: _________________________________
                                        Name:
                                        Title:
Attest:

- -------------------------
Name:
Title:


                                    NIPSCO CAPITAL MARKETS, INC.



                                    By: _________________________________
                                        Name:
                                        Title:
Attest:

- -------------------------
Name:
Title:


                                    THE CHASE MANHATTAN BANK, as Trustee


                                    By: _________________________________
                                        Name:
                                        Title:
Attest:

- -------------------------
Name:
Title:

                                       19

<PAGE>
 
                          (FORM OF FACE OF DEBENTURE)

[IF THE DEBENTURE IS TO BE A GLOBAL DEBENTURE, INSERT:  This Debenture is a
Global Security within the meaning of the Indenture hereinafter referred to and
is registered in the name of The Depository Trust Company, a New York
corporation (the "Depositary"), or a nominee of the Depositary. This Debenture
is exchangeable for Debentures registered in the name of a person other than the
Depositary or its nominee only in the limited circumstances described in the
Indenture, and no transfer of this Debenture (other than a transfer of this
Debenture as a whole by the Depositary to a nominee of the Depositary or by a
nominee of the Depositary to the Depositary or another nominee of the
Depositary) may be registered except in limited circumstances.

Unless this Debenture is presented by an authorized representative of the
Depositary to the issuer or its agent for registration of transfer, exchange or
payment, and any Debenture issued is registered in the name of Cede & Co. or
such other name as requested by an authorized representative of the Depositary,
and any payment hereon is made to Cede & Co., or to such other entity as is
requested by an authorized representative of the Depositary), and, except as
otherwise provided in the Indenture, ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered
owner hereof, Cede & Co., has an interest herein.]

No._______________
$_________________
CUSIP No. 654638 AC9


                        5.90% SENIOR DEBENTURE DUE 2005

NIPSCO Capital Markets, Inc., an Indiana corporation ("Capital Markets", which
term includes any successor corporation under the Indenture hereinafter referred
to), for value received, hereby promises to pay to ______________________, or
registered assigns, the principal sum of _______ Dollars on __________________,
2005, and to pay interest on said principal sum from February 16, 1999, or from
the most recent interest payment date (each such date, an "Interest Payment
Date") to which interest has been paid or duly provided for, quarterly in
arrears on February 19, May 19, August 19 and November 19 of each year
commencing May 19, 1999, at the rate of 5.90% per annum until February 19, 2003,
and at the Reset Rate thereafter, until the principal hereof shall have become
due and payable, and on any overdue principal and premium, if any, and (without
duplication and to the extent that payment of such interest is enforceable under
applicable law) on any overdue installment of interest at the same rate per
annum compounded quarterly.  The amount of interest payable for any period will
be computed (1) for any full quarterly period on the basis of a 360-day year of
twelve 30-day months and (2) for any period shorter than a full quarterly
period, on the basis of a 30-day month and, for any period less than a month, on
the basis of the actual number of days elapsed per 30-day month.  In the event
that any date on which interest is payable is not a Business Day, then payment
of the interest payable on such date will be made on the next day that is a
Business Day (and without any interest or other payment in respect of such
delay), except that, if such Business Day is in the next calendar year, then
such payment will be made on the preceding Business Day.  The interest
installment so payable, and punctually paid or duly provided for, on any
Interest Payment Date will, as provided in the Indenture referred to on the
reverse side hereof, be paid to the person in whose name this Debenture (or one
or more Predecessor Securities, as defined in said Indenture) is registered at
the close of business on the Regular Record Date for such interest installment,
which, if this Debenture is a Global Security, shall be the close of business on
the Business Day preceding such Interest Payment Date or, if this Debenture is
not a Global Security, shall be the close of business on the 15th Business Day
preceding such Interest Payment Date; 
<PAGE>
 
provided that interest paid at maturity shall be paid to the Person to whom
principal is paid. Any such interest installment not punctually paid or duly
provided for shall forthwith cease to be payable to the registered Holder on
such Regular Record Date and may be paid to the Person in whose name this
Debenture (or one or more Predecessor Securities) is registered at the close of
business on a special record date to be fixed by the Trustee referred to on the
reverse side hereof for the payment of such defaulted interest, notice whereof
shall be given to the registered Holders of the Debentures not less than 10 days
prior to such special record date, or may be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Debentures may be listed, and upon such notice as may be required
by such exchange, all as more fully provided in the Indenture. The principal of
and interest on this Debenture shall be payable at the office or agency of the
Trustee maintained for that purpose in any coin or currency of the United States
of America that at the time of payment is legal tender for payment of public and
private debts; provided, however, that payment of interest may be made at the
option of Capital Markets by check mailed to the registered Holder at such
address as shall appear in the Security Register. Notwithstanding the foregoing,
so long as the Holder of this Debenture is the Property Trustee, the payment of
the principal of (and premium, if any) and interest on this Debenture will be
made at such place and to such account as may be designated by the Property
Trustee.

This Debenture is, to the extent provided in the Indenture, senior and unsecured
and will rank in right of payment on a parity with all other senior unsecured
obligations of Capital Markets.

Unless the Certificate of Authentication hereon has been executed by the
Trustee, this Debenture shall not be entitled to any benefit under the Indenture
or be valid or obligatory for any purpose.  The provisions of this Debenture are
continued on the reverse side hereof, and such continued provisions shall for
all purposes have the same effect as though fully set forth at this place.
<PAGE>
 
          IN WITNESS WHEREOF, Capital Markets has caused this instrument to be
executed.


                              NIPSCO CAPITAL MARKETS, INC.


                              By:
                                 -----------------------------------

Attest:


By:
   -------------------------
     Secretary


                    (FORM OF CERTIFICATE OF AUTHENTICATION)
                         CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series referred to in the within-mentioned
Indenture.


Dated:                             THE CHASE MANHATTAN BANK, as Trustee
      ----------------

                                    By:
                                       ---------------------------------
                                         Authorized Officer
<PAGE>
 
                         (FORM OF REVERSE OF DEBENTURE)

This Debenture is one of a duly authorized series of Securities of Capital
Markets (herein sometimes referred to as the "Debentures"), all issued under and
pursuant to an Indenture dated as of February 14, 1997, duly executed and
delivered among NIPSCO Industries, Inc. ("Industries"), NIPSCO Capital Markets,
Inc. ("Capital Markets") and The Chase Manhattan Bank, as Trustee (the
"Trustee"), as supplemented by the First Supplemental Indenture thereto dated as
of _________________________, 1999, among Industries, Capital Markets and the
Trustee (such Indenture as so supplemented, the "Indenture"), to which Indenture
and all indentures supplemental thereto reference is hereby made for a
description of the rights, limitations of rights, obligations, duties and
immunities thereunder of the Trustee, Capital Markets, Industries and the
Holders of the Debentures.  By the terms of the Indenture, the Securities are
issuable in series that may vary as to amount, date of maturity, rate of
interest and in other respects as provided in the Indenture.  This series of
Securities is limited in aggregate principal amount to $355,700,000.

All terms used in this Debenture that are defined in the Indenture shall have
the meanings assigned to them in the Indenture.

If a Tax Event occurs and is continuing, Capital Markets may, at its option and
upon not less than 30 nor more than 60 days' notice to the Holders of the
Debentures, redeem the Debentures in whole (but not in part) within 90 days
following the occurrence of such Tax Event at the Redemption Price.  The
Redemption Price shall be paid prior to 12:00 noon, New York City time, on the
Tax Event Redemption Date, by check or wire transfer in immediately available
funds at such place and to such account as may be designated by each such
Holder.

The Debentures will not be subject to a sinking fund provision.

In case an Event of Default shall have occurred and be continuing, the principal
of all of the Debentures may be declared, and upon such declaration shall
become, due and payable, in the manner, with the effect and subject to the
conditions provided in the Indenture.

The Indenture contains provisions permitting Capital Markets and the Trustee,
with the consent of the Holders of not less than a majority in aggregate
principal amount of the Debentures and all other series of Securities affected
at the time Outstanding, as defined in the Indenture, to execute supplemental
indentures for the purpose of adding any provisions to or changing in any manner
or eliminating any of the provisions of the Indenture or of any supplemental
indenture or of modifying in any manner the rights of the Holders of the
Debentures; provided, however, that no such supplemental indenture may, without
the consent of the Holder of each outstanding Debenture, among other things, (i)
change the stated maturity of the principal of, or any installment of interest
on, any Debenture, (ii) reduce the principal amount of, or the rate of interest
on or any premium payable upon the redemption of, the Debentures,  (iii) impair
the right to institute suit for the enforcement of any such payment on or after
the stated maturity of or any redemption date for the Debentures or (iv) reduce
the above-stated percentage of principal amount of Debentures, the Holders of
which are required to modify or amend the Indenture, to consent to any waiver
thereunder or to approve any supplemental indenture.  The Indenture also
contains provisions permitting the Holders of a majority in aggregate principal
amount of the Debentures at the time outstanding affected thereby, on behalf of
all of the Holders of the Debentures, to waive any past default in the
performance of any of the covenants contained in the Indenture, or established
pursuant to the Indenture with respect to the Debentures, and its consequences,
except a default in the payment of the principal of or interest on any of the
Debentures (unless cured as provided in the Indenture) or in respect of a
covenant or provision that cannot be modified or amended without the consent of
the Holders of each Debenture then outstanding.  Any such consent or 
<PAGE>
 
waiver by the registered Holder of this Debenture (unless revoked as provided in
the Indenture) shall be conclusive and binding upon such Holder and upon all
future Holders and owners of this Debenture and of any Debenture issued in
exchange herefor or in place hereof (whether by registration of transfer or
otherwise), irrespective of whether or not any notation of such consent or
waiver is made upon this Debenture.

No reference herein to the Indenture and no provision of this Debenture or of
the Indenture shall alter or impair the obligation of Capital Markets, which is
absolute and unconditional, to pay the principal of and premium, if any, and
interest on this Debenture at the time and place and at the rate and in the
money herein prescribed.

As provided in the Indenture and subject to certain limitations therein set
forth, this Debenture is transferable by the registered Holder hereof on the
Security Register of Capital Markets, upon surrender of this Debenture for
registration of transfer at the office or agency of Capital Markets in the City
and State of New York accompanied by a written instrument or instruments of
transfer in form satisfactory to Capital Markets or the Trustee duly executed by
the registered Holder hereof or his attorney duly authorized in writing, and
thereupon one or more new Debentures of authorized denominations and for the
same aggregate principal amount will be issued to the designated transferee or
transferees. No service charge will be made for any such transfer, but Capital
Markets may require payment of a sum sufficient to cover any tax or other
governmental charge payable in relation thereto.

Prior to due presentment for registration of transfer of this Debenture, Capital
Markets, the Trustee, any paying agent and any Security Registrar may deem and
treat the registered holder hereof as the absolute owner hereof (whether or not
this Debenture shall be overdue and notwithstanding any notice of ownership or
writing hereon made by anyone other than the Security Registrar) for the purpose
of receiving payment of or on account of the principal hereof and premium, if
any, and interest due hereon and for all other purposes, and neither Capital
Markets nor the Trustee nor any paying agent nor any Security Registrar shall be
affected by any notice to the contrary.

No recourse shall be had for the payment of the principal of or the interest on
this Debenture, or for any claim based hereon, or otherwise in respect hereof,
or based on or in respect of the Indenture, against any incorporator,
stockholder, officer or director, past, present or future, as such, of Capital
Markets or of any predecessor or successor corporation, whether by virtue of any
constitution, statute or rule of law, or by the enforcement of any assessment or
penalty or otherwise, all such liability being, by the acceptance hereof and as
part of the consideration for the issuance hereof, expressly waived and
released.

The Indenture imposes certain limitations on the ability of Capital Markets and
Industries to, among other things, merge, consolidate or sell, assign, transfer
or lease all or substantially all of its properties or assets. Such covenants
and limitations are subject to a number of important qualifications and
exceptions.  Capital Markets and Industries must report periodically to the
Trustee on compliance with the covenants in the Indenture.

The Debentures of this series are issuable only in registered form without
coupons in denominations of $50 and any integral multiple thereof.  As provided
in the Indenture and subject to certain limitations herein and therein set
forth, Debentures of this series so issued are exchangeable for a like aggregate
principal amount of Debentures of this series of a different authorized
denomination, as requested by the Holder surrendering the same.


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