NRG ENERGY INC
8-K, 1999-05-27
ELECTRIC SERVICES
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT
     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported)              May 25, 1999
                                                   ----------------------------

                                NRG Energy, Inc.
- -------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

  Delaware                         333-33397                         41-1724239
- -------------------------------------------------------------------------------
(State or other jurisdiction        (Commission                   (IRS Employer
     of incorporation)              File Number)            Identification No.)
 1221 Nicollet Mall,
Minneapolis, Minnesota                                                  55403
- -------------------------------------------------------------------------------
     (Address of principal executive offices)                        (Zip Code)

Registrant's telephone number, including area code    (612) 373-5300
                                                     --------------------------

                                      None
- -------------------------------------------------------------------------------
         (Former name and former address, if changed since last report.)






























        POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION
        OF INFORMATION CONTAINED IN THIS FORM ARE NOT REQUIRED
        TO RESPOND UNLESS THE FORM
        DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.

<PAGE>   2

Item 5.  Other Events.

     In March, 1999, NRG Energy, Inc. (the "Company") filed, pursuant to Rule
415 under the Securities Act of 1933 (the "Act"), a registration statement on
Form S-3 (File No. 333-74519), which was declared effective on April 7, 1999. On
May 21, 1999, the Company filed a Prospectus Supplement, dated May 20, 1999, and
accompanying Prospectus, dated April 7, 1999, relating to the offering of
$300,000,000 principal amount of the Company's 7.5% Senior Notes due 2009 (the
"Notes"). On May 25, 1999, the offering of the Notes was completed. In this
connection, the Company is filing certain exhibits as part of this Form 8-K. See
"Item 7. Exhibits."


Item 7.  Exhibits.

         The following exhibits are filed with this report on Form 8-K:

Exhibit No.       Description
- -----------       -----------
4.1               Indenture, dated May 25, 1999, by and between the
                  Company and Norwest Bank Minnesota, National
                  Association, as Trustee, with a form of Senior Notes
                  attached as Exhibit A thereto.

12.1              Statement re Computation of Earnings to Fixed Charges Ratio.





<PAGE>   3





                                   SIGNATURES
      Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its
  behalf by the undersigned hereunto duly authorized.
                                                    NRG Energy, Inc.
                                        --------------------------------------
                                                      (Registrant)

Date   May 26, 1999
       --------------                   /S/ Leonard A. Bluhm

                                                         (Signature)*

                                        Name:  Leonard A. Bluhm
                                        Title:  Executive Vice President and
                                                Chief Financial Officer

*Print name and title of the signing officer under this signature














































<PAGE>   1
                                                                     EXHIBIT 4.1


                                NRG ENERGY, INC.

                                       and

                             NORWEST BANK MINNESOTA,
                              NATIONAL ASSOCIATION

                                   as Trustee

                                    INDENTURE

                            Dated as of May 25, 1999

                                  $300,000,000

                          7 1/2% Senior Notes Due 2009





<PAGE>   2


                                TABLE OF CONTENTS
<TABLE>

                                                                                                               Page
                                                                                                               ----

<S>                                <C>                                                                           <C>
         ARTICLE I                  DEFINITIONS...................................................................1
                                    Section 1.1      Certain Terms Defined........................................1

         ARTICLE II                 ISSUE, EXECUTION, FORM AND REGISTRATION
                                    OF SECURITIES.................................................................7
                                    Section 2.1      Authentication and Delivery of Securities....................7
                                    Section 2.2      Execution of Securities......................................8
                                    Section 2.3      Certificate of Authentication................................8
                                    Section 2.4      Form, Denomination and Date of Securities;
                                                     Payments of Interest.........................................8
                                    Section 2.5      Global Securities...........................................11
                                    Section 2.6      Registration, Registration of Transfer and Exchange.........11
                                    Section 2.7      Mutilated, Defaced, Destroyed, Lost and Stolen
                                                     Securities..................................................13
                                    Section 2.8      Cancellation of Securities:  Destruction Thereof............14
                                    Section 2.9      Temporary Securities........................................14
                                    Section 2.10     Computation of Interest.....................................14

         ARTICLE III                COVENANTS OF THE ISSUER AND THE TRUSTEE......................................15
                                    Section 3.1      Payment of Principal and Interest...........................15
                                    Section 3.2      Offices for Payments, etc...................................15
                                    Section 3.3      Appointment to Fill Vacancy in Office of Trustee............15
                                    Section 3.4      Paying Agents...............................................16
                                    Section 3.5      Certificate to Trustee......................................16
                                    Section 3.6      Securityholder's Lists......................................17
                                    Section 3.7      Reports by the Issuer.......................................17
                                    Section 3.8      Limitation on Liens.........................................17
                                    Section 3.9      Repurchase of Securities Upon a Change of Control...........18

         ARTICLE IV                 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON
                                    EVENT  OF DEFAULT............................................................19
                                    Section 4.1      Event of Default Defined; Acceleration of Maturity;
                                                     Waiver of Default...........................................19
                                    Section 4.2      Collection of Indebtedness by Trustee;
                                                     Trustee May Prove Debt......................................22
                                    Section 4.3      Application of Proceeds.....................................24
                                    Section 4.4      Suits for Enforcement.......................................25
                                    Section 4.5      Restoration of Rights on Abandonment of Proceedings.........25
</TABLE>


                                        i

<PAGE>   3


<TABLE>

                                                                                                               Page
                                                                                                               ----

<S>                                 <C>                                                                         <C>
                                    Section 4.6      Limitations of Suits by Securityholders.....................25
                                    Section 4.7      Powers and Remedies Cumulative, Delay or Omission
                                                     Not Waiver of Default.......................................26
                                    Section 4.8      Control by Securityholders..................................26
                                    Section 4.9      Waiver of Past Defaults.....................................27
                                    Section 4.10     Rights of Holders to Receive Payment........................27

         ARTICLE V                  CONCERNING THE TRUSTEE.......................................................27
                                    Section 5.1      Duties and Responsibilities of the Trustee;
                                                     During Default; Prior to Default............................27
                                    Section 5.2      Certain Rights of the Trustee...............................29
                                    Section 5.3      Trustee Not Responsible for Recitals, Disposition of
                                                     Securities or Application of Proceeds Thereof...............30
                                    Section 5.4      Trustee and Agents May Hold Securities;
                                                     Collections, etc............................................30
                                    Section 5.5      Moneys Held by Trustee......................................30
                                    Section 5.6      Compensation and Indemnification of Trustee
                                                     and Its Prior Claim.........................................30
                                    Section 5.7      Right of Trustee to Rely on Officers' Certificate, etc......31
                                    Section 5.8      Persons Eligible for Appointment as Trustee.................31
                                    Section 5.9      Resignation and Removal; Appointment of
                                                     Successor Trustee...........................................31
                                    Section 5.10     Acceptance of Appointment by Successor Trustee..............33
                                    Section 5.11     Merger, Conversion, Consolidation or Succession to
                                                     Business of Trustee.........................................33

         ARTICLE VI        CONCERNING THE SECURITYHOLDERS........................................................34
                                    Section 6.1      Evidence of Action Taken by Securityholders.................34
                                    Section 6.2      Proof of Execution of Instruments and of Holding
                                                     of Securities Record Date...................................34
                                    Section 6.3      Holders to Be Treated as Owners.............................35
                                    Section 6.4      Securities Owned by Issuer Deemed Not Outstanding...........35
                                    Section 6.5      Right of Revocation of Action Taken.........................35

         ARTICLE VII       SUPPLEMENTAL INDENTURES...............................................................36
                                    Section 7.1      Supplemental Indentures Without Consent of
                                                     Securityholders.............................................36
                                    Section 7.2      Supplemental Indentures With Consent of
                                                     Securityholders.............................................37
                                    Section 7.3      Effect of Supplemental Indenture............................38
                                    Section 7.4      Documents to Be Given to Trustee............................38
</TABLE>

                                       ii

<PAGE>   4
<TABLE>


                                                                                                               Page
                                                                                                               ----
<S>                                <C>                                                                         <C>
                                    Section 7.5      Notation of Securities in Respect of Supplemental
                                                     Indentures..................................................38

         ARTICLE VIII               CONSOLIDATION, MERGER, SALE OR CONVEYANCE....................................39
                                    Section 8.1      Covenant Not to Merge, Consolidate, Sell
                                                     or Transfer Assets Except Under Certain Conditions..........39
                                    Section 8.2      Successor Corporation Substituted...........................39
                                    Section 8.3      Opinion of Counsel to Trustee; Officers' Certificate........40

         ARTICLE IX                 SATISFACTION AND DISCHARGE OF INDENTURE;
                                    UNCLAIMED MONEYS.............................................................40
                                    Section 9.1      Satisfaction and Discharge of Indenture.....................40
                                    Section 9.2      Application by Trustee of Funds Deposited
                                                     for Payment of Securities...................................41
                                    Section 9.3      Repayment of Moneys Held by Paying Agent....................42
                                    Section 9.4      Return of Moneys Held by Trustee and Paying Agent
                                                     Unclaimed for Two Years.....................................42
                                    Section 9.5      Defeasance and Discharge of Indenture.......................42
                                    Section 9.6      Defeasance of Certain Obligations...........................43

         ARTICLE X                  MISCELLANEOUS PROVISIONS.....................................................45
                                    Section 10.1     Incorporators, Shareholders, Officers and
                                                     Directors of Issuer Exempt from Individual Liability........45
                                    Section 10.2     Provisions of the Indenture for the Sole Benefit of
                                                     Parties and Securityholders.................................45
                                    Section 10.3     Successors and Assigns of Issuer Bound by Indenture.........45
                                    Section 10.4     Notices and Demands on Issuer, Trustee and
                                                     Securityholders.............................................45
                                    Section 10.5     Officers' Certificates and Opinions of Counsel,
                                                     Statements to Be Contained Therein..........................46
                                    Section 10.6     Payments Due on Saturdays, Sundays and Holidays.............47
                                    Section 10.7     New York Law to Govern......................................47
                                    Section 10.8     Counterparts................................................47
                                    Section 10.9     Effect of Headings..........................................48

         ARTICLE XI        REDEMPTION OF SECURITIES..............................................................48
                                    Section 11.1     Right of Optional Redemption Price..........................48
                                    Section 11.2     Notice of Redemption........................................48
                                    Section 11.3     Payment of Securities Called for Redemption.................49
</TABLE>


                                       iii

<PAGE>   5



             INDENTURE, dated as of May 25, 1999, between NRG ENERGY, INC., a
Delaware corporation (herein called the "Issuer"), and NORWEST BANK MINNESOTA,
NATIONAL ASSOCIATION, as trustee (herein called the "Trustee").

                              W I T N E S S E T H:

           WHEREAS, the Issuer has duly authorized the issue of $300,000,000
aggregate principal amount of its 7 1/2% Senior Notes Due 2009 (the
"Securities") and, to provide, among other things, for the authentication,
delivery and administration thereof, the Issuer has duly authorized the
execution and delivery of this Indenture; and

             WHEREAS, all things necessary to make the Securities, when executed
by the Issuer and authenticated and delivered by the Trustee as in this
Indenture provided, the valid, binding and legal obligations of the Issuer, and
to constitute these presents a valid indenture and agreement according to its
terms, have been done;

             NOW, THEREFORE:

             In consideration of the premises and the purchases of the
Securities by the Holders (as defined herein) thereof, the Issuer and the
Trustee mutually covenant and agree for the equal and proportionate benefit of
the respective Holders from time to time of the Securities as follows:


                                    ARTICLE I

                                   DEFINITIONS

             Section 1.1 Certain Terms Defined.

             The following terms (except as otherwise expressly provided) for
all purposes of this Indenture shall have the respective meanings specified in
this Section. All accounting terms used herein and not expressly defined shall
have the meanings given to them in accordance with GAAP (as defined herein). The
words "herein," "hereof" and "hereunder" and other words of similar import refer
to this Indenture as a whole and not to any particular Article, Section or other
subdivision. The terms defined in this Article include the plural as well as the
singular.


             "Agent Members" has the meaning set forth in Section 2.4(b).

             "Board of Directors" means either the Board of Directors of the
Issuer or any committee of such Board duly authorized to act on behalf of such
Board.



                                        1

<PAGE>   6



             "Business Day" means a day which is neither a legal holiday nor a
day on which banking institutions (including, without limitation, the Federal
Reserve System) are authorized or required by law or regulation to close in The
City of New York or the city of Minneapolis, Minnesota.

             "Capital Stock" means, with respect, to any Person, any and all
outstanding shares, interests, participations or other equivalents (however
designated, whether voting or non-voting) of, or interests in (however
designated), the equity of such Person including, without limitation, all Common
Stock and Preferred Stock and partnership and joint venture interests of such
Person.

             "Cedel" has the meaning set forth in Section 2.4(b).

             "Change of Control" means the occurrence of one or more of the
following events: (i) NSP (or its successors) shall cease to own a majority of
the outstanding Voting Stock of the Issuer, (ii) at any time following the
occurrence of the event described in clause (i), a Person or group (as that term
is used in Section 13(d)(3) of the Exchange Act) of Persons (other than NSP)
shall have become the beneficial owner directly or indirectly, or shall have
acquired the absolute power to direct the vote, of more than 35% of the
outstanding Voting Stock of the Issuer or (iii) during any twelve-month period,
individuals who at the beginning of such period constitute the Board of
Directors (together with any new directors whose election or nomination was
approved by a majority of the directors then in office who were either directors
at the beginning of such period or who were previously so approved) shall cease
for any reason to constitute a majority of the Board of Directors.
Notwithstanding the foregoing, a Change of Control shall be deemed not to have
occurred if one or more of the above events occurs or circumstances exist and,
after giving effect thereto, the Securities are rated Investment Grade. For
purposes of clause (i), NSP's "successors" shall be deemed to include NSP, as
the "surviving corporation," as that term is used in the Agreement and Plan of
Merger, dated as of March 24, 1999, by and between NSP and New Century Energies,
Inc., if the merger contemplated by such agreement is consummated substantially
in accordance with the terms specified therein.

             "Change of Control Offer" has the meaning set forth in Section
3.9(b).

             "Commission" means the Securities and Exchange Commission, as from
time to constituted, created under the Exchange Act, or, if at any time after
the execution of this Indenture such Commission is not existing and performing
the duties now assigned to it under the Trust Indenture Act, then the body (if
any) performing such duties at such time.

             "Common Stock" means, with respect to any Person, Capital Stock of
such Person that does not rank prior, as to the payment of dividends or as to
the distribution of assets upon any voluntary or involuntary liquidation,
dissolution or winding up of such Person, to shares of any other class of
Capital Stock of such Person.



                                        2

<PAGE>   7



             "Consolidated Current Assets" and "Consolidated Current
Liabilities" mean such assets and liabilities of the Issuer on a consolidated
basis as shall be determined in accordance with GAAP to constitute current
assets and current liabilities, respectively, provided that inventory shall be
valued at the lower of cost (using the average life method) or market.

             "Consolidated Net Tangible Assets" means, as of the date of
determination thereof, the total amount of all Issuer's assets determined on a
consolidated basis in accordance with GAAP as of such date less the sum of (a)
Issuer's consolidated current liabilities determined in accordance with GAAP and
(b) assets properly classified as intangible assets, in accordance with GAAP.

             "Consolidated Total Assets" means, as of the date of any
determination thereof, the total amount of all assets of the Issuer determined
on a consolidated basis in accordance with GAAP.

             "Corporate Trust Office" means the principal office of the Trustee
at which the corporate trust business of the Trustee shall, at any particular
time, be principally administered, which office is, at the date as of which this
Indenture is dated, located at Corporate Trust, Norwest Center, Sixth and
Marquette, Minneapolis, Minnesota 55479-0069.

             "Euroclear" has the meaning set forth in Section 2.4(b).

             "Event of Default" means any event or condition specified as such
in Section 4.1 hereof that shall have continued for the period of time, if any,
therein designated.

             "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

             "GAAP" means generally accepted accounting principles in the U.S.
applied on a basis consistent with the principles, methods, procedures and
practices employed in the prepara tion of the Issuer's audited financial
statements, including, without limitation, those set forth in the opinions and
pronouncements of the Accounting Principles Board of the American Institute of
Certified Public Accountants and statements and pronouncements of the Financial
Accounting Standards Board or in such other statements by such other entity as
approved by a significant segment of the accounting profession.

             "Global Security" has the meaning set forth in Section 2.4(b).

             "Holder," "Holder of Securities," "Securityholder" and other
similar terms mean the registered holder of any Security.

             "Indebtedness" has the meaning set forth in Section 3.8.



                                        3

<PAGE>   8



             "Indenture" means this instrument as originally executed and
delivered or, if amended or supplemented as herein provided, as so amended or
supplemented.

             "Intangible Assets" means, as of the date of determination thereof,
all assets of the Issuer properly classified as intangible assets determined on
a consolidated basis in accordance with GAAP.

             "Interest Payment Date" means, with respect to any Security, the
Stated Maturity of an installment of interest on such Security.

             "Investment Banker" means an independent investment banking
institution of national standing selected by the Issuer.

             "Investment Grade" means, with respect to the Securities, a rating
of Baa3 or higher by Moody's Investors Service, Inc., and a rating of BBB- or
higher by Standard and Poor's Ratings Group (or, if either or both of the
foregoing rating agencies ceases to rate the Securities for reasons beyond the
control of the Issuer, equivalent ratings by one or two (as the case may be)
other nationally recognized statistical rating organizations (as such term is
defined in Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act)); provided that if
either of the foregoing rating agencies shall change its ratings designations
while the Securities are Outstanding, "Investment Grade" shall mean the lowest
ratings designation signifying "investment grade" issued by such agencies (or
higher).

             "Issuer" means NRG Energy, Inc., a Delaware corporation, and,
subject to Article 8 hereof, its successors and assigns.

             "Make Whole Amount" means, with respect to a Security at any time,
the sum of the present values of the Remaining Scheduled Payments discounted, on
a semiannual basis (assuming a 360 day year consisting of twelve 30-day months),
at a rate equal to the Treasury Rate plus 25 basis points. The Make Whole Amount
shall be computed as of the third Business Day prior to the applicable
redemption date, and certified, by an Investment Banker.

             "NSP" means Northern States Power Company, a Minnesota corporation.

             "Officers' Certificate" means a certificate signed on behalf of the
Issuer by the Chairman of the Board of Directors or the President or any Vice
President and by the Chief Financial Officer or the Secretary or any Assistant
Secretary or the Treasurer or any Assistant Treasurer of the Issuer and
delivered to the Trustee. Each such certificate shall include the statements
provided for in Section 10.5 hereof, if and to the extent required thereby.

             "Opinion of Counsel" means an opinion in writing signed by legal
counsel satisfactory to the Trustee, who may be an employee of or counsel to the
Issuer. Each such


                                        4

<PAGE>   9



opinion shall include the statements provided for in Section 10.5 hereof, if and
to the extent required thereby.

             "Original Issue Date" of any Security (or portion thereof) means
the earlier of (a) the date of such Security or (b) the date of any Security (or
portion thereof) in exchange for which such Security was issued (directly or
indirectly) on registration of transfer, exchange or substitution.

             "Outstanding", when used with reference to Securities, shall,
subject to the provisions of Section 6.4 hereof, mean, as of any particular
time, all Securities authenticated and delivered by the Trustee under this
Indenture, except:

             1. Securities theretofore canceled by the Trustee or delivered to
         the Trustee for cancellation, or which shall have been paid pursuant to
         Section 2.7 hereof (other than any such Securities in respect of which
         there shall have been presented to the Trustee proof satisfactory to it
         that such Securities are held by a bona fide purchaser in whose hands
         the Securities are valid obligations of the Issuer); and

             2. Securities, or portions thereof, for the payment or redemption
         of which moneys or direct obligations of the United States of America
         backed by its full faith and credit in the necessary amount shall have
         been deposited in trust with the Trustee or with any paying agent
         (other than the Issuer) or shall have been set aside, segregated and
         held in trust by the Issuer (if the Issuer shall act as its own paying
         agent), provided that if such Securities are to be redeemed prior to
         the maturity thereof, notice of such redemption shall have been herein
         provided, or provision satisfactory to the Trustee shall have been
         given as herein provided, or provision satisfactory to the Trustee
         shall have been made for giving such notice.

             "Person" means an individual, a corporation, a partnership, a
limited liability company, an association, a trust or any other entity or
organization, including a government or political subdivision or an agency or
instrumentality thereof.

             "Preferred Stock" means, with respect to any Person, any and all
shares, interests, participation or other equivalents (however designated,
whether voting or non-voting) of preferred or preference Capital Stock of such
Person that is outstanding or issued on or after the date of this Indenture.

             "Remaining Scheduled Payments" means the remaining scheduled
payments of the principal and interest that would be due if such Security were
not redeemed. However, if the redemption date is not a scheduled interest
payment date, the amount of the next succeeding scheduled interest payment on
such debt security will be reduced by the amount of interest accrued on such
Security to such redemption date.

             "Repurchase Date" has the meaning set forth in Section 3.9(b).


                                        5

<PAGE>   10



             "Responsible Officer", when used with respect to the Trustee, means
any officer of the Trustee assigned by the Trustee to administer its corporate
trust matters.

             "Securities Act" means the Securities Act of 1933, as amended.

             "Security" or "Securities" has the meaning set forth in the
recitals above.

             "Securities Register" and "Security Registrar" have the respective
meanings specified in Section 2.6.

             "Stated Maturity" means, with respect to any debt security or any
installment of interest thereon, the date specified in such debt security as the
fixed date on which any principal of such debt security or any such installment
of interest is due and payable.

             "Treasury Rate" means an annual rate equal to the semiannual
equivalent yield to maturity of the Comparable Treasury Issue (as defined
below), assuming a price for the Compa rable Treasure Issue (expressed as a
percentage of its principal amount) equal to the Comparable Treasury Price (as
defined below) for the redemption date. The semiannual equivalent yield to
maturity will be computed as of the third Business day immediately preceding the
redemption date. "Comparable Treasury Issue" means the Unites States Treasury
security selected by Salomon Smith Barney or an affiliate as having a maturity
comparable to the remaining term of the notes that would be utilized, at the
time of selection and in accordance with customary financial practice, in
pricing new issues of corporate notes of comparable maturity to the remaining
term of the notes. "Comparable Treasury Price" means the average of three
Reverence Treasury Dealer Quotations (as defined below) obtained by the trustee
for the redemption date. "Reference Treasury Dealers" means Salomon Smith Barney
(so long as it continues to be a primary U.S. Government securities dealer) and
any two other primary U.S. Government securities dealers chosen by the Issuer.
If Salomon Smith Barney ceases to be a primary U.S. Government securities
dealers, the Issuer will appoint in its place another nationally recognized
investment banking firm that is a primary U.S. Government securities dealer.
"Reference Treasury Dealer Quotation" means the average, as determined by the
Trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) quoted in
writing to the Trustee by a Reference Treasury Dealer at 3:30 p.m., New York
City time, on the third Business day preceding the redemption date.

             "Trust Indenture Act" means the Trust Indenture Act of 1939, as
amended.

             "Trustee" means the entity identified as "Trustee" in the first
paragraph hereof until the appointment of a successor trustee pursuant to
Article 5, after which "Trustee" shall mean such successor trustee.

             "U.S. Depositary" means The Depository Trust Company.



                                        6

<PAGE>   11



             "U.S. Government Obligations" means securities that are (i) direct
and uncondi tional obligations of the United States of America for the payment
of which its full faith and credit is pledged or (ii) obligations of a Person
controlled or supervised by, and acting as an agency or instrumentality of, the
United States of America, the payment of which is uncondition ally guaranteed as
a full faith and credit obligation by the United States of America, which, in
either case, are not callable or redeemable at the option of the issuer thereof,
and shall also include a depository receipt issued by a bank or trust company
subject to federal or state supervision or examination with a combined capital
and surplus of at least $100,000,000, as custodian with respect to any such U.S.
Government Obligations or a specific payment of interest on or principal of any
such U.S. Government Obligation held by such custodian for the account of the
holder of a depository receipt, provided that (except as required by law) such
custodian is not authorized to make any deduction from the amount payable to the
holder of such depository receipt from any amount received by the custodian in
respect of the U.S. Government Obligation or the specific payment of interest on
or principal of the U.S. Government Obligation evidenced by such depository
receipt.

             "Voting Stock" means, with respect to any Person, Capital Stock of
any class or kind ordinarily having the power to vote for the election of
directors (or persons fulfilling similar responsibilities) of such Person.

             "1996 Senior Notes" means $125,000,000 aggregate principal amount
of 7.625% Senior Notes Due 2006 of the Issuer, issued pursuant to an Indenture
dated as of January 31, 1996, between the Issuer and Norwest Bank Minnesota,
National Association.

             "1997 Senior Notes" means $250,000,000 principal amount of 7 1/2%
Senior Notes Due 2007 of the Issuer, issued pursuant to an Indenture dated as of
June 1, 1997, between the Issuer and Norwest Bank Minnesota, National
Association.


                                   ARTICLE II

                           ISSUE, EXECUTION, FORM AND
                           REGISTRATION OF SECURITIES

             Section 2.1 Authentication and Delivery of Securities.

             Upon the execution and delivery of this Indenture, or from time to
time thereafter, Securities in an aggregate principal amount not in excess of
$300,000,000 (except as otherwise provided in Section 2.7 hereof) may be
executed by the Issuer and delivered to the Trustee for authentication, and the
Trustee shall thereupon authenticate and deliver said Securities to or upon the
written order of the Issuer, signed by both (a) its Chairman of the Board of
Directors, or any Vice Chairman of the Board of Directors, or its President or
any Vice President and (b) by its Chief Financial Officer, or its Secretary or
any Assistant Secretary, or its Treasurer or any


                                        7

<PAGE>   12



Assistant Treasurer without any further action by the Issuer. The Securities
shall be direct, unconditional obligations of the Issuer and shall rank pari
passu without preference among themselves and equally in priority of payment
with all other present and future unsubordinated, unsecured indebtedness of the
Issuer.

             Section 2.2 Execution of Securities.

             The Securities shall be signed on behalf of the Issuer by both (a)
its Chairman of the Board of Directors or any Vice Chairman of the Board of
Directors or its President or any Vice President and (b) by its Chief Financial
Officer or its Secretary or its Assistant Secretary or its Treasurer or any
Assistant Treasurer, under its corporate seal which may, but need not, be
attested. Such signatures may be the manual or facsimile signatures of the
present or any future such officers. The seal of the Issuer may be in the form
of a facsimile thereof and may be impressed, affixed, imprinted or otherwise
reproduced on the Securities. Typographical and other minor errors or defects in
any such reproduction of the seal or any such signature shall not affect the
validity or enforceability of any Security that has been duly authenticated and
delivered by the Trustee.

             In case any officer of the Issuer who shall have signed any of the
Securities shall cease to be such officer before the Security so signed shall be
authenticated and delivered by the Trustee or disposed of by the Issuer, such
Security nevertheless may be authenticated and delivered or disposed of as
though the Person who signed such Security had not ceased to be such officer of
the Issuer; and any Security may be signed on behalf of the Issuer by such
Persons as, at the actual date of the execution of such Security, shall be the
proper officers of the Issuer, although at the date of the execution and
delivery of this Indenture any such Person was not such officer.

             Section 2.3 Certificate of Authentication.

             Only such Securities as shall bear thereon a certificate of
authentication substan tially in the form recited in the form of Security
attached as Exhibit A hereto, executed by that Trustee by manual signature of
one of its authorized signatories, shall be entitled to the benefits of this
Indenture or be valid or obligatory for any purpose. Such certificate by the
Trustee upon any Security executed by the Issuer shall be conclusive evidence
that the Security so authenti cated has been duly authenticated and delivered
hereunder and that the Holder is entitled to the benefits of this Indenture.

             Section 2.4 Form, Denomination and Date of Securities; Payments of
Interest.

                     (a) The Securities and the Trustee's certificate of
authentication shall be substantially in the form set forth in the form of
Security attached as Exhibit A hereto. The Securities shall be numbered,
lettered, or otherwise distinguished in such manner or in accor-


                                       8
<PAGE>   13

dance with such plans as the officers of the Issuer executing the same may
determine with the approval of the Trustee.

             Any of the Securities may be issued with appropriate insertions,
omis sions, substitutions and variations and may have imprinted or otherwise
reproduced thereon such legend or legends, not inconsistent with the provisions
of this Indenture, as may be required to comply with any law or with any rules
or regulations pursuant thereto, or with the rules of any securities market in
which the Securities are admitted to trading, or to conform to general usage.

             (b) (i) This Section 2.4(b)(i) shall apply only to Securities in
global form ("Global Securities") deposited with the U.S. Depositary.

             The Issuer shall execute and the Trustee shall, in accordance with
this Section 2.4(b)(i), authenticate and deliver initially Global Securities
that (a) shall be registered in the name of the U.S. Depositary for such Global
Securities or the nominee of such U.S. Deposi tary, (b) shall be deposited on
behalf of Agent Members (as defined herein) with the Trustee as custodian for
the U.S. Depositary and (c) shall bear legends substantially to the following
effect:

         "UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
         OF [INSERT NAME AND ADDRESS OF U.S. DEPOSI TARY] TO THE ISSUER OR ITS
         AGENT FOR REGISTRATION OF TRANS FER, EXCHANGE OR PAYMENT, AND ANY
         CERTIFICATE ISSUED IN EXCHANGE FOR THIS CERTIFICATE OR ANY PORTION
         HEREOF IS REGISTERED IN THE NAME OF [INSERT NAME OF U.S. NOMINEE OF
         DEPOSITARY], OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
         REPRESENTATIVE OF [INSERT NAME OF U.S. DEPOSI TARY], OR SUCH OTHER NAME
         AS IS REQUESTED BY AN AUTHO RIZED REPRESENTATIVE OF [INSERT NAME OF
         U.S. DEPOSITARY] (AND ANY PAYMENT HEREON IS MADE TO [INSERT NAME OF
         NOMI NEE OF U.S. DEPOSITARY]), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
         FOR VALUE OR OTHERWISE BY OR TO ANY PERSON OTHER THAN [INSERT NAME OF
         U.S. DEPOSITARY OR A NOMINEE THEREOF] IS WRONGFUL INASMUCH AS THE
         REGISTERED OWNER HEREOF, [INSERT NAME OF NOMINEE OF U.S. DEPOSITARY]
         HAS AN INTEREST HEREIN".

         "TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN
         WHOLE, BUT NOT IN PART, TO NOMINEES OF [INSERT NAME OF U.S. DEPOSITARY]
         OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF
         PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN
         ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 2.6 OF THE
         INDENTURE REFERRED TO ON THE REVERSE HEREOF".


                                        9

<PAGE>   14



             Members of, or participants in, a U.S. Depositary ("Agent Members")
shall have no rights under this Indenture with respect to any Global Security
held on their behalf by the U.S. Depositary or under any Global Security, and
the U.S. Depositary may be treated by the Issuer, the Trustee, and any agent of
the Issuer or the Trustee as the absolute owner of such Global Security for all
purposes whatsoever. Notwithstanding the foregoing, nothing herein shall prevent
the Issuer, the Trustee or any agent of the Issuer or the Trustee from giving
effect to any written certification, proxy or other authorization furnished by
the U.S. Depositary or impair, as between the U.S. Depositary and its Agent
Members, the operation of customary practices governing the exercise of the
rights of a holder of any security.

                  (ii) This Section 2.4(b)(ii) shall apply only to the Global
         Security deposited on behalf of the purchasers of the Securities repre-
         sented thereby with the Trustee as custodian for the U.S. Depositary
         for credit to their respective accounts (or to such other accounts as
         they may direct) at Euroclear System ("Euroclear") or Cedel, S.A.
         ("Cedel") insofar as interests in the Global Security are held by the
         Agent Members for Euroclear or Cedel.

             The provisions of the "Operating Procedures of the Euroclear
System" and the "Terms and Conditions Governing Use of Euroclear" and the
"Management Regulations" and "Instructions to Participants" of Cedel,
respectively, shall be applicable to such Global Security insofar as interests
therein are held by the Agent Members for Euroclear and Cedel. Account holders
or participants in Euroclear and Cedel shall have no rights under this Indenture
with respect to the Global Security, and the nominee of the U.S. Depositary may
be treated by the Issuer and the Trustee and any agent of the Issuer or the
Trustee as the owner of the Global Security for all purposes whatsoever.
Notwithstanding the foregoing, nothing herein shall prevent the Issuer, the
Trustee or any agent of the Issuer or the Trustee from giving effect to any
written certification, proxy or other authorization furnished by the U.S.
Depositary or impair, as between the U.S. Depositary and its Agent Members, the
operation of customary practices governing the exercise of the rights of a
holder of any security.

             (c) Each Security shall be dated the date of its authentication and
shall bear interest from the applicable date, and shall be payable on the dates
specified on the face of the form of Security attached as Exhibit A hereto.

             (d) The Person in whose name any Security is registered at the
close of business on the record date specified in the Securities with respect to
any Interest Payment Date shall be entitled to receive the interest, if any,
payable on such Interest Payment Date notwith standing any transfer or exchange
of such Security subsequent to the record date and prior to such Interest
Payment Date, except if and to the extent the Issuer shall default in the
payment of the interest due on such Interest Payment Date, in which case such
defaulted interest shall be paid to the Persons in whose names Outstanding
Securities are registered at the close of business on a subsequent special
record date, to be established (together with the related payment date) by the
Issuer with the consent of the Trustee. Such special record date shall not be
more than 15 nor


                                       10

<PAGE>   15



less than 10 Business Days prior to the payment date. Not more than 15 days
prior to the special record date, the Issuer (or the Trustee, in the name of and
at the expense of the Issuer) shall mail to Holders a notice that states the
special record date, the related payment date and the amount of interest to be
paid. Notice of the proposed payment of such defaulted interest and the special
record date therefor having been mailed as aforesaid, such defaulted interest
shall be paid to the Persons in whose names the Securities are registered on
such special record date.

             (e) The Securities shall be issuable in the denominations specified
in the form of Security attached as Exhibit A hereto.

         Section 2.5 Global Securities.

             (a) Portions of a Global Security deposited with the U.S.
Depositary pursuant to Section 2.4 shall be transferred in certificated form to
the beneficial owners thereof only if such transfer complies with Section 2.6 of
this Indenture and (i) the U.S. Depositary notifies the Issuer that it is
unwilling or unable to continue as U.S. Depositary for such Global Security or
if at any time such U.S. Depositary ceases to be a "clearing agency" registered
under the Exchange Act and a successor depositary is not appointed by the Issuer
within 90 days of such notice, or (ii) an Event of Default has occurred and is
continuing with respect to the Securities and payment of principal thereof and
interest thereon has been accelerated.

             (b) Portions of any Global Security that are transferable to the
beneficial owners thereof pursuant to this Section 2.5 shall be surrendered by
the U.S. Depositary to the Trustee at its New York office for registration of
transfer, in whole or from time to time in part, without charge and the Trustee
shall authenticate and deliver, upon such registration of transfer of each
portion of such Global Security, an equal aggregate principal amount of
Securities of authorized denominations. Any portion of a Global Security whose
registration is transferred pursuant to this Section 2.5 shall be executed,
authenticated and delivered only in the denominations specified in the form of
Security attached as Exhibit A hereto and registered in such names as the U.S.
Depositary shall direct.

             (c) Subject to the provisions of Section 2.4(b) above, the
registered Holder of any Global Security may grant proxies and otherwise
authorize any person, including Agent Members and persons that may hold
interests through Agent Members, to take any action which a Holder is entitled
to take under this Indenture or the Securities.

             (d) In the event of the occurrence of any of the events specified
in paragraph (a) of this Section 2.5, the Issuer shall promptly make available
to the Trustee a reasonable supply of certificated Securities in definitive
fully, registered form without interest coupons.

         Section 2.6 Registration, Registration of Transfer and Exchange.



                                       11

<PAGE>   16



             (a) The Issuer shall keep at each office or agency to be maintained
for the purpose as provided in Section 3.2 hereof a register or registers
(collectively referred to as the "Securities Register") in which, subject to
such reasonable regulations as it may prescribe, it will register or cause to be
registered, the transfer of Securities as provided in this Article. The Trustee
is hereby appointed "Security Registrar" for the purpose of registering
Securities and transfers of Securities as herein provided. If at any time the
Trustee shall not be serving as Security Registrar, at all reasonable times such
Securities Register shall be open for inspection by the Trustee.

             Upon due presentation for registration of transfer of any Security
at each such office or agency, the Issuer shall execute and the Trustee shall
authenticate and deliver in the name of the transferee or transferees a new
Security or Securities in authorized denomina tions for a like aggregate
principal amount.

             Any Security or Securities may be exchanged for a Security or
Securities in other authorized denominations, in an equal aggregate principal
amount. Securities to be exchanged shall be surrendered at each office or agency
to be maintained by the Issuer for the purpose as provided in Section 3.2
hereof, and the Issuer shall execute and the Trustee shall authenticate and
deliver in exchange therefor the Security or Securities which the Securityholder
making the exchange shall be entitled to receive, bearing numbers not
contemporaneously outstanding.

             All Securities presented for registration of transfer, exchange,
redemption or payment shall (if so required by the Issuer or the Trustee) be
duly endorsed by, or be accompa nied by a written instrument or instruments of
transfer in form satisfactory to the Issuer and the Trustee duly executed by,
the Holder or its attorney duly authorized in writing.

             The Issuer or Trustee shall not be required to exchange or register
a transfer of (a) any Securities for a period of 15 days next preceding the
first mailing of notice of redemption of Securities to be redeemed or (b) any
Securities selected, called or being called for redemption except, in the case
of any Security where public notice has been given that such Security is to be
redeemed in part, the portion thereof not so to be redeemed.

             All Securities issued upon any registration of transfer or exchange
of Securities shall be valid obligations of the Issuer, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

             (b) Notwithstanding any provision to the contrary herein, so long
as a Global Security remains outstanding and is held by or on behalf of the U.S.
Depositary, transfers of a Global Security, in whole or in part, shall only be
made (x) in the case of transfers of portions of a Global Security, to
beneficial owners thereof in certificated form, in accordance with Section 2.5,
and (y) in all other cases, in accordance with this Section 2.6(b).


                                       12

<PAGE>   17


             (c) Successive registrations and registrations of transfers and ex
changes as aforesaid may be made from time to time as desired, and each such
registration shall be noted on the Security Register. No service charge shall be
made for any registration of transfer or exchange of the Securities, but the
Trustee may require payment of a sum sufficient to cover any tax or other
governmental charge payable in connection therewith and any other amounts
required to be paid by the provisions of the Securities.

         Section 2.7 Mutilated, Defaced, Destroyed, Lost and Stolen Securities.

         In case any temporary or definitive Security shall become mutilated,
defaced or be apparently destroyed, lost or stolen, the Issuer in its discretion
may execute, and upon the written request any officer of the Issuer, the Trustee
shall authenticate and deliver a new Security, bearing a number not
contemporaneously outstanding, in exchange and substitution for the mutilated or
defaced Security, or in lieu of and substitution for Security so apparently
destroyed, lost or stolen. In every case the applicant for a substitute Security
shall furnish to the Issuer and to the Trustee and any agent of the Issuer or
the Trustee such security or indemnity as may be required by them to indemnify
and defend and to save each of them harmless and, in every case of destruction,
loss or theft, evidence to their satisfaction of the apparent destruction, loss
or theft of such Security and of the ownership thereof.

         Upon the issuance of an substitute Security, the Issuer may require the
payment of a sum sufficient to cover any tax or other governmental charge that
may be imposed in relation thereto and any other expenses (including the fees
and expenses of the Trustee) connected therewith. In case any Security which has
matured or is about to mature, or has been called for redemption in full, shall
become mutilated or defaced or be apparently destroyed, lost or stolen. the
Issuer may, instead of issuing a substitute Security, pay or authorize the
payment of the same (without surrender thereof except in the case of a mutilated
or defaced Security), if the applicant for such payment shall furnish to the
Issuer and to the Trustee and any agent of the Issuer or the Trustee such
security or indemnity as any of them may require to save each of them harmless
from all risks, however remote, and, in every case of apparent destruction, loss
or theft, the applicant shall also furnish to the Issuer and the Trustee and any
agent of the Issuer or the Trustee evidence to their satisfaction of the
apparent destruction, loss or theft of such Security and of the ownership
thereof.

         Every substitute Security issued pursuant to the provisions of this
Section by virtue of the fact that any Security is apparently destroyed, lost or
stolen shall constitute an additional contractual obligation of the Issuer,
whether or not the apparently destroyed, lost or stolen Security shall be at any
time enforceable by anyone and shall be entitled to all the benefits of (but
shall be subject to all the limitations of rights set forth in) this Indenture
equally and proportionately with any and all other Securities duly authenticated
and delivered hereunder. All Securities shall be held and owned upon the express
condition that, to the extent permitted by law, the foregoing provisions are
exclusive with respect to the replacement or payment of


                                       13

<PAGE>   18


mutilated, defaced, or apparently destroyed, lost or stolen Securities and shall
preclude any and all other rights or remedies notwithstanding any law or statute
existing or hereafter enacted to the contrary with respect to the replacement or
payment of negotiable instruments or other securities without their surrender.

         Section 2.8 Cancellation of Securities: Destruction Thereof.

         All Securities surrendered for payment, redemption, registration of
transfer or exchange, if surrendered to the Issuer or any agent of the Issuer or
the Trustee, shall be delivered to the Trustee for cancellation or, if
surrendered to the Trustee, shall be canceled by it provided all conditions
regarding such cancellation have been met; and no Securities shall be issued in
lieu thereof except as expressly permitted by any of the provisions of this
Indenture. The Trustee shall cancel and dispose of all Securities surrendered
for registration of transfer, exchange, payment or cancellation in accordance
with the Trustee's policy of disposal. If the Issuer shall acquire any of the
Securities, such acquisition shall not operate as a redemption or satisfaction
of the indebtedness represented by such Securities unless and until the same are
delivered to the Trustee for cancellation.

         Section 2.9 Temporary Securities.

         Pending the preparation of definitive Securities, the Issuer may
execute and the Trustee shall authenticate and deliver temporary Securities
(printed, lithographed, typewritten or otherwise reproduced, in each case in
form satisfactory to the Trustee). Temporary Securities shall be issuable as
registered Securities without coupons, of any authorized denomination, and
substantially in the form of the definitive Securities but with such omissions,
insertions and variations as may be appropriate for temporary Securities, all as
may be determined by the Issuer with the concurrence of the Trustee. Temporary
Securities may contain such reference to any provisions of this Indenture as may
be appropriate. Every temporary Security shall be executed by the Issuer and be
authenticated by the Trustee upon the same conditions and in substantially the
same manner, and with like effect, as the definitive Securities. Without
unreasonable delay the Issuer shall execute and shall furnish definitive
Securities and thereupon temporary Securities may be surrendered in exchange
therefor without charge at each office or agency to be main tained by the Issuer
for the purpose pursuant to Section 3.2 hereof, and the Trustee shall
authenticate and deliver in exchange for such temporary Securities a like
aggregate principal amount of definitive Securities of authorized denominations.
Until so exchanged the temporary Securities shall be entitled to the same
benefits under this Indenture as definitive Securities.

         Section 2.10 Computation of Interest.

         Interest on the Securities shall be computed on the basis of a 360-day
year of twelve 30-day months.




                                       14

<PAGE>   19



                                   ARTICLE III

                                  COVENANTS OF
                           THE ISSUER AND THE TRUSTEE

         Section 3.1 Payment of Principal and Interest.

         The Issuer covenants and agrees that it will duly and punctually pay or
cause to be paid the principal and Change of Control purchase price of, and
premium, if any, and interest on, each of the Securities at the place or places,
at the respective times and in the manner provided in the Securities. Payment of
principal and the Change of Control purchase price of, and premium and interest
on the Securities shall be paid by mailing a check to or upon the written order
of the registered Holders of Securities entitled thereto at their last address
as it appears on the Securities Register or, upon written application to the
Trustee by a Holder of $1,000,000 or more in aggregate principal amount of
Securities, by wire transfer of immediately available funds to an account
maintained by such Holder with a bank or other financial institution; provided,
however, that (subject to the provisions of Section 2.7 hereof) payment of
principal and the Change of Control Price of, and premium, if any, on, any
Security may be conditioned upon presentation for payment of the certificate
representing such Security.

         Section 3.2 Offices for Payments, etc.

         So long as any of the Securities remain Outstanding, the Issuer shall
maintain in the Borough of Manhattan, The City of New York, the following: (a)
an office or agency where the Securities may be presented for payment, (b) an
office or agency where the Securities may be presented for registration of
transfer and for exchange as in this Indenture provided and (c) an office or
agency where notices and demands to or upon the Issuer in respect of the
Securities or of this Indenture may be served. The Issuer shall give to the
Trustee written notice of the location of any such office or agency and of any
change of location thereof. The Issuer hereby initially designates the Trustee's
New York office as such office or agency. In case the Issuer shall fail to
maintain any such office or agency or shall fail to give such notice of the
location or of any change in the location thereof, presentations and demands may
be made and notices may be served at the Corporate Trust Office.

         Section 3.3 Appointment to Fill Vacancy in Office of Trustee.

         The Issuer, whenever necessary to avoid or fill a vacancy in the office
of Trustee, shall appoint, in the manner provided in Section 5.9 hereof, a
Trustee, so that there shall at all times be a Trustee hereunder.



                                       15

<PAGE>   20



         Section 3.4 Paying Agents.

         The Trustee shall be the principal paying agent for the Securities.
Whenever the Issuer shall appoint a paying agent other than the Trustee, it
shall cause such paying agent to execute and deliver to the Trustee an
instrument in which such agent shall agree with the Trustee, subject to the
provisions of this Section,

             (a) that it will hold all sums received by it as such agent for the
payment of the principal or Change of Control purchase price of, or premium or
interest on, the Securities (whether such sums have been paid to it by the
Issuer or by any other obligor on the Securities) in trust for the benefit of
the Holders of the Securities or of the Trustee,

             (b) that it will give the Trustee notice of any failure by the
Issuer (or by any other obligor on the Securities) to make any payment of the
principal or Change of Control purchase price of, or premium or interest on, the
Securities when the same shall be due and payable and

             (c) pay any such sums so held in trust by it to the Trustee upon
the Trustee's written request at any time during the continuance of the failure
referred to in clause (b) above.

             The Issuer shall, prior to each due date of the principal or Change
of Control purchase price of, and premium, if any, or interest on the
Securities, deposit with the paying agent a sum sufficient to pay such
principal, Change of Control purchase price, premium or interest, and (unless
such paying agent is the Trustee) the Issuer shall promptly notify the Trustee
of any failure to take such action.

             Anything in this Section 3.4 to the contrary notwithstanding, the
Issuer may at any time, for the purpose of obtaining satisfaction and discharge
of this Indenture or for any other reason, pay or cause to be paid to the
Trustee all sums held in trust by any paying agent hereunder, as required by
this Section 3.4, such sums to be held by the Trustee upon the trusts herein
contained.

             Anything in this Section to the contrary notwithstanding, the
agreement to hold sums in trust as provided in this Section 3.4 is subject to
the provisions of Section 9.3 and Section 9.1 hereof.

         Section 3.5 Certificate to Trustee.

         Issuer shall furnish to the Trustee on or before March 31 in each year
(beginning with [date]) a brief certificate from the principal executive,
financial or accounting officer of this Issuer as to his or her knowledge of the
Issuer's compliance with all covenants under this Indenture (such compliance to
be determined without regard to any period of grace or require ment of notice
provided under this Indenture).


                                       16

<PAGE>   21




         Section 3.6 Securityholder's Lists.

         The Issuer shall furnish or cause to be furnished to the Trustee a list
in such form as the Trustee may reasonably require of the names and addresses of
the Holders of the Securities (a) semiannually not more than 15 days after each
record date for the payment of semi-annual interest on the Securities, as
specified in the form of Security attached as Exhibit A hereto, as of such
record date and (b) at other times as the Trustee may request in writing, within
thirty days after receipt by the Issuer of any such request as of a date not
more than 15 days prior to the time such information is furnished.

         Section 3.7 Reports by the Issuer.

         The Issuer shall file with the Trustee and provide Securityholders,
within 15 days after it files them with the Commission, copies of its annual
reports and of the information, documents and other reports (or copies of such
portions of any of the foregoing as the Commis sion may by rules and regulations
prescribe) that the Issuer is required to file with the Commis sion pursuant to
Section 13 or 15(d) of Exchange Act.

         Section 3.8 Limitation on Liens.

         So long as any of the Securities are Outstanding, the Issuer shall not
pledge, mortgage or hypothecate, or permit to exist, any mortgage, pledge or
other lien upon any property at any time directly owned by the Issuer to secure
any indebtedness for money borrowed that is incurred, issued, assumed or
guaranteed by the Issuer ("Indebtedness"), without making effective provisions
whereby the Securities shall be equally and ratably secured with any and all
such Indebtedness and with any other Indebtedness similarly entitled to be
equally and ratably secured; provided, however, that this restriction shall not
apply to or prevent the creation or existence of (i) liens existing at the
Original Issuance Date of the Securities, (ii) purchase money liens that do not
exceed the cost or value of the purchased property, (iii) other liens not to
exceed 10% of Consolidated Net Tangible Assets, and (iv) liens granted in
connection with extending, renewing, replacing or refinancing, in whole or in
part, the Indebtedness (including, without limitation, increasing the principal
amount of such Indebtedness) secured by liens described in the foregoing clauses
(i) through (iii).

         In the event that the Issuer shall propose to pledge, mortgage or
hypothecate any property at any time directly owned by it to secure any
Indebtedness, other than as permitted by clauses (i) through (iv) of the
previous paragraph, the Issuer shall (prior thereto) give written notice thereof
to the Trustee, who shall give notice to the Holders, and the Issuer shall,
prior to or simultaneously with such pledge, mortgage or hypothecation,
effectively secure all the Securities equally and ratably with such
Indebtedness.



                                       17

<PAGE>   22



         Section 3.9 Repurchase of Securities Upon a Change of Control.

             (a) Upon a Change of Control, each Holder of the Securities shall
have the right to require that the Issuer repurchase such Holder's Securities at
a repurchase price in cash equal to 101% of the principal amount thereof plus
accrued interest, if any, to the date of repurchase, in accordance with the
terms set forth in subsection (b) below.

             (b) Within 30 days following any Change of Control, the Issuer
shall mail a notice to each Holder (with a copy to the Trustee) stating:

                 (1) that a Change of Control has occurred and that such Holder
has the right to require the Issuer to repurchase such Holder's Securities at a
repurchase price in cash equal to 101% of the principal amount thereof plus
accrued interest, if any, to the date of repurchase (the "Change of Control
Offer");

                 (2) the circumstances and relevant facts regarding such Change
of Control (including information with respect to pro forma historical income,
cash flow and capitalization of the Issuer after giving effect to such Change of
Control);

                 (3) the repurchase date (which shall be a Business Day and be
not earlier than 30 days or later than 60 days from the date such notice is
mailed) (the "Repur chase Date");

                 (4) that any Security not tendered for purchase will continue
to accrue interest;

                 (5) that interest on any Security accepted for payment pursuant
to the Change of Control Offer shall cease to accrue after the repurchase of
such Security on the Repurchase Date;

                 (6) that Holders electing to have a Security purchased pursuant
to a Change of Control Offer will be required to surrender the Security, with
the form entitled "Option of Holder to Elect Purchase" on the reverse of the
Security completed, to the paying agent at the address specified in the notice
prior to the close of business on the Business Day prior to the Repurchase Date;

                 (7) that Holders will be entitled to withdraw their election if
the paying agent receives, not later than the close of business on the third
Business Day (or such shorter periods as may be required by applicable law)
preceding the Repurchase Date, a telegram, telex, facsimile transmission or
letter setting forth the name of the Holder, the principal amount of Securities
the Holder delivered for purchase, and a statement that such Holder is
withdrawing its election to have such Securities purchased; and


                                       18

<PAGE>   23



                 (8) that Holders that elect to have their Securities purchased
only in part will be issued new Securities in a principal amount equal to then
unpurchased portion of the Securities surrendered.

             (c) Notwithstanding the foregoing, for so long as the Securities
are in the form of Global Securities, the Issuer shall deliver to the U.S.
Depositary within the time periods specified above, for retransmittal to its
Agent Members, a notice substantially to the effect specified in clauses (1)
through (5) and (7) above, which notice shall also specify the required
procedures (furnished by the U.S. Depositary) for holders of interests in the
Global Securities to tender and receive payment of the purchase price for such
interests (including the U.S. Depositary's "Repayment Option Procedures," to the
extent applicable), all in accordance with the U.S. Depositary's rules,
regulations and practices.

             (d) On the Repurchase Date, the Issuer shall (i) accept for payment
Securities or portions thereof tendered pursuant to the Change of Control Offer,
(ii) deposit with the Trustee money sufficient without reinvestment to pay the
purchase price of all Securities or portions thereof so tendered and (iii)
deliver or cause to be delivered to the Trustee Securities so accepted together
with an Officers' Certificate identifying the Securities or portions thereof
tendered to the Issuer. The Trustee shall promptly mail to the Holders of the
Securities so accepted payment in an amount equal to the purchase price, and
promptly authenticate and mail to such Holders a new Security in a principal
amount equal to any unpurchased portion of the Security surrendered. The Issuer
will publicly announce the results of the Change of Control Offer on or as soon
as practicable after the Repurchase Date.

             (e) The Issuer shall comply with Rule 14e-1 under the Exchange Act
and any other applicable laws and regulations in the event that a Change of
Control occurs and the Issuer is required to make a Change of Control Offer.


                                   ARTICLE IV

                           REMEDIES OF THE TRUSTEE AND
                       SECURITYHOLDERS ON EVENT OF DEFAULT

         Section 4.1 Event of Default Defined; Acceleration of Maturity; Waiver
of Default.

         In case of one or more of the following Events of Default (whatever the
reason for such Event of Default and whether it shall be voluntary or
involuntary or be effected by operation of law or pursuant to any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body) shall have occurred and be continuing, that
is to say:



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<PAGE>   24



             (a) default in the payment of all or any part of the principal or
Change of Control purchase price of, or premium, if any, on, any of the
Securities as and when the same shall become due and payable either at maturity,
upon any redemption or required repurchase, by declaration of acceleration or
otherwise;

             (b) default in the payment of any installment of interest upon any
of the Securities as and when the same shall become due and payable, and
continuance of such default for a period of 30 days;

             (c) an event of default, as defined in any instrument of the Issuer
under which there may be issued, or by which there may be secured or evidenced,
any Indebtedness of the Issuer that has resulted in the acceleration of such
Indebtedness, or any default occurring in payment of any such Indebtedness at
final maturity (and after the expiration of any applicable grace periods), other
than such Indebtedness (i) which is payable solely out of the property or assets
of a partnership, joint venture or similar entity of which the Issuer is a
participant, or which is secured by a lien on the property or assets owned or
held by such entity, without further recourse to or liability of the Issuer, or
(ii) the principal of, and interest on, which, when added to the principal of
and interest on all other such Indebtedness (exclusive of Indebtedness under
clause (i) above), does not exceed $20,000,000; or

             (d) failure on the part of the Issuer duly to observe or perform
any other of the covenants or agreements on the part of the Issuer in the
Securities or in this Indenture and such failure continues for a period of 30
days after the date on which written notice specify ing such failure, stating
that such notice is a "Notice of Default" hereunder and demanding that the
Issuer remedy the same, shall have been given by registered or certified mail,
return receipt requested, to the Issuer by the Trustee, or to the Issuer and the
Trustee by the Holders of at least 25% in aggregate principal amount of the
Securities at the time Outstanding; or

             (e) one or more final judgments, decrees or orders of any court,
tribunal, arbitrator, administrative or other governmental body or similar
entity for the payment of money shall be rendered against the Issuer or any of
its properties in an aggregate amount in excess of $20,000,000 (excluding the
amount thereof covered by insurance) and such judgment, decree or order shall
remain unvacated, undischarged and unstayed for more than 90 consecutive days,
except while being contested in good faith by appropriate proceedings; or

             (f) a court having jurisdiction in the premises shall enter a
decree or order for relief in respect of the Issuer in an involuntary case or
proceeding under any applicable bankruptcy, insolvency, reorganization or other
similar law now or hereafter in effect, or a decree or order adjudging the
Issuer a bankrupt or insolvent, or approving as properly filed a petition
seeking reorganization, arrangement, adjustment, or composition of or in respect
of the Issuer under any applicable federal or state law, or appointing a
receiver, liquidator, assignee, custo dian, trustee, sequestrator or similar
official of the Issuer or for any substantial part of its property or


                                       20


<PAGE>   25



ordering the winding up or liquidation of its affairs, shall have been entered,
and such decree or order shall remain unstayed and in effect for a period of 90
consecutive days; or

             (g) the Issuer shall commence a voluntary case or proceeding under
any applicable federal or state bankruptcy, insolvency, reorganization or other
similar law now or hereafter in effect or of any other case or proceeding to be
adjudicated a bankrupt or insolvent, or consent to the entry of a decree or
order for relief in an involuntary case or proceeding under any such law, or to
the commencement of any bankruptcy or insolvency case or proceeding against the
Issuer, or the filing by the Issuer of a petition or answer or consent seeking
reorganization or relief under any such applicable federal or state law, or the
consent by the Issuer to the filing of such petition or to the appointment of or
the taking possession by a custodian, receiver, liquida tor, assignee, trustee,
sequestrator or other similar official of the Issuer or of any substantial part
of its property, or the making by the Issuer of an assignment for the benefit of
creditors, or the taking of action by the Issuer in furtherance of any such
action; then and in each and every such case (other than an Event of Default
with respect to the Issuer specified in 4.1(f) or 4.1(g) hereof), unless the
principal of all of the Securities shall have already become due and payable,
either the Trustee or the Holders of not less than 25% in aggregate principal
amount of the Securities then Outstanding hereunder, by notice in writing to the
Issuer (and to the Trustee if given by Securityholders), may declare the entire
principal of all the Securities and the interest accrued thereon to be due and
payable immediately, and upon any such declaration the same shall become
immediately due and payable. This provision, however, is subject to the
condition that if, at any time after the principal of the Securities shall have
been so declared due and payable, and before any judgment or decree for the
payment of the moneys due shall have been obtained or entered as hereinafter
provided, the Issuer shall pay or shall deposit with the Trustee a sum
sufficient to pay all matured installments of interest upon all the Securities
and the principal or Change of Control purchase price and premium, if any, of
any and all Securities that shall have become due otherwise than by acceleration
(with interest upon such principal and Change of Control purchase price and
premium, if any, and, to the extent that payment of such interest is enforceable
under applicable law, on overdue installments of interest, at the rate of
interest specified in the Securities, to the date of such payment or deposit)
and such amount as shall be sufficient to cover reasonable compensation to the
Trustee and each predecessor Trustee, their respective agents, attorneys and
counsel, and all other reasonable expenses and liabilities incurred and all
reasonable advances made, by the Trustee and each predecessor Trustee except as
a result of negligence or bad faith, and if any and all Events of Default under
the Indenture, other than the non-payment of the principal that shall have
become due by acceleration, shall have been cured, waived or otherwise remedied
as provided herein, then and in every such case the Holders of a majority in
aggregate principal amount of the Securities then Outstanding, by written notice
to the Issuer and to the Trustee, may waive all defaults (except, unless
theretofore cured, a default in payment of principal of, or Change of Control
purchase price or premium, if any, or interest on, the Securities) and rescind
and annul such declaration and its consequences, but no such waiver or
rescission and annulment shall extend to or shall affect any subsequent default
or shall impair any right consequent thereon.



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<PAGE>   26



             If an Event of Default specified in Section 4.1(f) or 4.1(g) hereof
occurs with respect to the Issuer, the principal of and accrued interest on the
Security shall become and be immediately due and payable without any declaration
or other act on the part of the Trustee or any Securityholder.

         Section 4.2 Collection of Indebtedness by Trustee; Trustee May Prove
Debt.

         The Issuer covenants that (a) in case default shall be made in the
payment of any installment of interest on any of the Securities when such
interest shall have become due and payable, and such default shall have
continued for a period of 30 days or (b) in case default shall be made in the
payment of all or any part of the principal or Change of Control purchase price
of, or premium, if any, on, any of the Securities when the same shall have
become due and payable, whether upon maturity or upon any redemption or by
declaration or acceleration or otherwise, then upon demand of the Trustee, the
Issuer shall pay to the Trustee for the benefit of the Holders of the Securities
the whole amount that then shall have become due and payable on all such
Securities of principal. Change of Control purchase price, premium or interest,
as the case may be (with interest to the date of such payment upon the overdue
principal, Change of Control purchase price or premium and, to the extent that
payment of such interest is enforceable under applicable law, on overdue
installments of interest at the rate of interest specified in the Securi ties);
and in addition thereto, such further amount as shall be sufficient to cover the
costs and expenses of collection, including reasonable compensation to the
Trustee and each predecessor Trustee, their respective agents, attorneys and
counsel, and any reasonable expenses and liabilities incurred, and all
reasonable advances made, by the Trustee and each predecessor Trustee except as
a result of its negligence or bad faith.

         Until such demand is made by the Trustee, the Issuer may pay the
principal and Change of Control purchase price of and premium and interest on
the Securities to the registered Holders, whether or not the Securities be
overdue.

         In case the Issuer shall fail forthwith to pay such amounts upon such
demand, the Trustee, in its own name and as trustee of an express trust, shall
be entitled and empowered to institute any action or proceedings at law or in
equity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceedings to judgment or final decree, and may enforce any such
judgment or final decree against the Issuer or other obligor upon the Securities
and collect in the manner provided by law out of the property of the Issuer or
other obligor upon the Securities, wherever situated, the moneys adjudged or
decreed to be payable.

         In case there shall be pending proceedings relative to the Issuer or
any other obligor upon the Securities under Title 11 of the United States Code
or any other applicable federal or state bankruptcy, insolvency or other similar
law, or in case a receiver, assignee or trustee in bankruptcy or reorganization,
liquidator, custodian, sequestrator or similar official shall have been
appointed for or taken possession of the Issuer or its property or such other
obligor, or in case of any other comparable judicial proceedings relative to the
Issuer or other obligor upon


                                       22

<PAGE>   27



the Securities, or to the creditors or property of the Issuer or such other
obligor, the Trustee, irrespective of whether the principal of the Securities
shall then be due and payable as therein expressed or by declaration or
otherwise and irrespective or whether the Trustee shall have made any demand
pursuant to the provisions of this Section 4.2, shall be entitled and empowered,
by intervention in such proceedings or otherwise:

             (a) to file and prove a claim or claims for the whole amount of
principal, Change of Control purchase price, premium and interest owing and
unpaid in respect of the Securities, and to file such other papers or documents
as may be necessary or advisable in order to have the claims of the Trustee
(including any claim for reasonable compensation to the Trustee and each
predecessor Trustee, and their respective agents, attorneys and counsel, and for
reimbursement of all reasonable expenses and liabilities incurred, and all
reasonable advances made, by the Trustee and each predecessor Trustee, except as
a result of negligence or bad faith) and of the Securityholders, allowed in any
judicial proceedings relative to the Issuer or other obligor upon the
Securities, or to the creditors or property of the Issuer or such other obligor;

             (b) unless prohibited by applicable law and regulations, to vote on
behalf of the Holders of the Securities in any election of a trustee or a
standby trustee in arrangement, reorganization, liquidation or other bankruptcy
or insolvency proceedings or person performing similar functions in comparable
proceedings; and

             (c) to collect and receive any moneys or other property payable or
deliverable on any such claims, and to distribute all amounts received with
respect to the claims of the Securityholders and of the Trustee on their behalf;
and any trustee, receiver, or liquidator, custodian or other similar official is
hereby authorized by each of the Securityholders to make payments to the
Trustee, and, in the event that the Trustee shall consent to the making of
payments directly to the Securityholders, to pay to the Trustee such amounts as
shall be sufficient to cover reasonable compensation to the Trustee, each
predecessor Trustee and their respective agents, attorneys and counsel, and all
other reasonable expenses and liabilities incurred, and all reasonable advances
made, by the Trustee and each predecessor Trustee except as a result of
negligence or bad faith.

             Nothing herein contained shall be deemed to authorize the Trustee
to authorize or consent to or vote for or accept or adopt on behalf of any
Securityholders any plan or reorganization, arrangement, adjustment or
composition affecting the Securities or the rights of any Holder thereof, or to
authorize the Trustee to vote in respect of the claim of any Securityholder in
any such proceeding except, as aforesaid, to vote for the election of a trustee
in bankruptcy or similar person.

             All rights of action and of asserting claims under this Indenture,
or under any of the Securities, may be enforced by the Trustee without the
possession of any of the Securities or the production thereof at any trial or
other proceedings relative thereto, and any such action or proceedings
instituted by the Trustee shall be brought in its own name as trustee of


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<PAGE>   28



an express trust, and any recovery of judgment, subject to the payment of the
expenses, disburse ments and compensation of the Trustee, each predecessor
Trustee and their respective agents and attorneys, shall be for the ratable
benefit of the Holders of the Securities.

             In any proceedings brought by the Trustee (and also any proceedings
involving the interpretation of any provision of this Indenture to which the
Trustee shall be a party) the Trustee shall be held to represent all the Holders
of the Securities, and it shall not be necessary to make any Holders of the
Securities parties to any such proceedings.

         Section 4.3 Application of Proceeds.

         Any moneys collected by the Trustee pursuant to this Article shall be
applied in the following order at the date or dates fixed by the Trustee and, in
case of the distribution of such moneys on account of principal or interest,
upon presentation of the several Securities and stamping (or otherwise noting)
thereon the payment, or issuing Securities in reduced principal amounts in
exchange for the presented Securities if only partially paid, or upon surrender
thereof if fully paid:

         FIRST: To the payment of costs and expenses, including reasonable
compensa tion to the Trustee and each predecessor Trustee and their respective
agents and attorneys and of all reasonable expenses and liabilities incurred,
and all reasonable advances made, by the Trustee and each predecessor Trustee
except as a result of negligence or bad faith and all other amounts due under
Section 5.6 hereof;

         SECOND: In case the principal and the Change of Control purchase price
and premium, if any, of the Securities shall not have become and be then due and
payable, to the payment of interest in default in the order of the maturity of
the installments of such interest, with interest (to the extent that such
interest has been collected by the Trustee) upon the overdue installments of
interest at the rate of interest specified in the Securities, such payments to
be made ratably to the persons entitled thereto, without discrimination or
preference;

         THIRD: In case the principal or the Change of Control purchase price of
the Securities shall have become and shall be then due and payable, to the
payment of the whole amount then owing and unpaid upon all the Securities for
principal, Change of Control purchase price, premium, and interest, with
interest upon the overdue principal, Change of Control purchase price, premium,
if any, and (to the extent that such interest has been collected by the Trustee)
upon overdue installments of interest at the rate of interest specified in the
Securities, and in case such moneys shall be insufficient to pay in full the
whole amount so due and unpaid upon the Securities, then to the payment of such
principal, Change of Control purchase price, premium and interest, without
preference or priority of principal, Change of Control purchase price or premium
over interest, or of interest over principal or Change of Control purchase price
or premium, or of any installment of interest over any other installment of
interest, or of any


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<PAGE>   29



Security over any other Security, ratably to the aggregate of such principal and
accrued and unpaid interest; and

         FOURTH: To the payment of the remainder, if any, to the Issuer or any
other Person lawfully entitled thereto.

         The Trustee may fix a record date and payment date for any payment to
Securityholders pursuant to this Section 4.3.

         Section 4.4 Suits for Enforcement.

         In case an Event of Default has occurred, has not been waived and is
continuing, the Trustee may in its discretion proceed to protect and enforce the
rights vested in it by this Indenture by such appropriate judicial proceedings
as the Trustee shall deem most effectual to protect and enforce any of such
rights, either at law or in equity or in bankruptcy or otherwise, whether for
the specific enforcement of any covenant or agreement contained in this
Indenture or in aid of the exercise of any power granted in this Indenture or to
enforce any other legal or equitable right vested in the Trustee by this
Indenture or by law.

         Section 4.5 Restoration of Rights on Abandonment of Proceedings.

         In case the Trustee shall have proceeded to enforce any right under
this Indenture and such proceedings shall have been discontinued or abandoned
for any reason, or shall have been determined adversely to the Trustee, then and
in every such case the Issuer and the Trustee shall be restored respectively to
their former positions and rights hereunder, and all rights, remedies and powers
of the Issuer, the Trustee and the Securityholders shall continue as though no
such proceedings had been taken.

         Section 4.6 Limitations of Suits by Securityholders.

         No Holder of any Security shall have any right by virtue or by availing
of any provision of this Indenture to institute any action or proceeding at law
or in equity or in bank ruptcy or otherwise upon or under or with respect to
this Indenture, or for the appointment of a trustee, receiver, liquidator,
custodian or other similar official or for any other remedy hereunder, unless
such Holder previously shall have given to the Trustee written notice of default
and of the continuance thereof, as hereinbefore provided, and unless also the
Holders of not less than 25% in aggregate principal amount of the Securities
then Outstanding shall have made written request upon the Trustee to institute
such action or proceedings in its own name as trustee hereunder and shall have
offered to the Trustee such reasonable indemnity as it may require against the
costs, expenses and liabilities to be incurred therein or thereby and the
Trustee for 30 days after its receipt of such notice, request and offer of
indemnity shall have failed to institute any such action or proceedings and no
direction inconsistent with such written request shall have been given to the
Trustee pursuant to Section 4.8 hereof; it being understood and intended, and


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<PAGE>   30


being expressly covenanted by the taker and Holder of every Security with every
other taker and Holder and the Trustee, that no one or more Holders of
Securities shall have any right in any manner whatever by virtue or by availing
of any provision of this Indenture to affect, disturb or prejudice the rights of
any other Holder of Securities, or to obtain or seek to obtain priority over or
preference to any other such Holder or to enforce any fight under this
indenture, except in the manner herein provided and for the equal, ratable and
common benefit of all Holders of Securities. For the protection and enforcement
of the provisions of this Section 4.6 each and every Securityholder and the
Trustee shall be entitled to such relief as can be given either at law or in
equity.

         Section 4.7 Powers and Remedies Cumulative, Delay or Omission Not
Waiver of Default.

         Except as provided in Section 2.7 hereof, no right or remedy herein
conferred upon or reserved to the Trustee or to the Securityholders is intended
to be exclusive of any other right or remedy, and every right and remedy shall,
to the extent permitted by law, be cumulative and in addition to every other
right and remedy given hereunder or now or hereafter existing at law or in
equity or otherwise. The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

         No delay or omission of the Trustee or of any Holder of any of the
Securities to exercise as aforesaid any such right or power accruing upon any
Event of Default occurring and continuing as aforesaid shall impair any such
right or power or shall be construed to be a waiver of any such Event of Default
or an acquiescence therein; and, subject to Section 4.6 hereof, every power and
remedy given by this Indenture or by law to the Trustee or to the
Securityholders may be exercised from time to time, and as often as shall be
deemed expedient, by the Trustee or by the Securityholders.

         Section 4.8 Control by Securityholders.

         The Holders of a majority in aggregate principal amount of the
Securities at the time Outstanding shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
Trustee, or exercising any trust or power conferred on the Trustee by this
Indenture; provided that such direction shall not be otherwise than in
accordance with law and the provisions of this Indenture; and provided further
that (subject to the provisions of Section 5.1 hereof) the Trustee shall have
the right to decline to follow any such direction if the Trustee, being advised
by counsel, shall determine that the action or proceeding so directed may not
lawfully be taken or if the Trustee in good faith by its board of directors, the
executive committee, or a trust committee of directors or Responsible Officers
of the Trustee shall determine that the action or proceedings so directed would
involve the Trustee in personal liability or if the Trustee in good faith shall
so determine that the actions or forbearances specified in or pursuant to such
direction shall be unduly prejudicial to the interests of Holders of


                                       26

<PAGE>   31

the Securities not joining in the giving of said direction, it being understood
that (subject to Section 5.1 hereof) the Trustee shall have no duty to ascertain
whether or not such actions or forbearances are unduly prejudicial to such
Holders.

         Nothing in this Indenture shall impair the right of the Trustee in its
discretion to take any action deemed proper by the Trustee and which is not
inconsistent with such direction by Securityholders.

         Section 4.9 Waiver of Past Defaults.

         Prior to the declaration of the maturity of the Securities as provided
in Section 4.1 hereof, the Holders of a majority in aggregate principal amount
of the Securities at the time Outstanding may on behalf of the Holders of all
the Securities waive any past default or Event of Default hereunder and its
consequences, except a default (a) in the payment of principal or Change of
Control purchase price of, premium, if any, or interest on any of the Securities
or (b) in respect of a covenant or provision hereof that cannot be modified or
amended without the consent of the Holder of each Security affected. In the case
of any such waiver, the Issuer, the Trustee and the Holders of the Securities
shall be restored to their former positions and rights hereunder, respectively;
but no such waiver shall extend to any subsequent or other default or impair any
right consequent thereon.

         Upon any such waiver, such default shall cease to exist and be deemed
to have been cured and not to have occurred, and any Event of Default arising
therefrom shall be deemed to have been cured, and not to have occurred for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or Event of Default or impair any right consequent thereon.

         Section 4.10 Rights of Holders to Receive Payment.

         Notwithstanding any other provision of this Indenture (including,
without limitation, Section 4.6 hereof), the right of any Holder to receive, and
to institute suit to enforce, payment of the principal and Change of Control
purchase price of, and premium, if any, and interest on the Securities on or
after the respective due dates expressed in such Securities (including upon
redemption and acceleration of the maturity of the principal of and premium, if
any, and interest on the Securities), shall not be affected or impaired, and
shall be absolute and unconditional.


                                    ARTICLE V

                             CONCERNING THE TRUSTEE



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<PAGE>   32

         Section 5.1 Duties and Responsibilities of the Trustee; During Default;
Prior to Default.

         The Trustee, prior to the occurrence of an Event of Default and after
the curing or waiving of all Events of Default that may have occurred,
undertakes to perform only such duties as are specifically set forth in this
Indenture. In case an Event of Default has occurred (which has not been cured or
waived) the Trustee shall exercise such of the rights and powers vested in it by
this Indenture, and use the same degree of care and skill in their exercise, as
a prudent man would exercise or use under the circumstances in the conduct of
his own affairs.

         No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act or its own willful miscon duct, except that

             (a) prior to the occurrence of an Event of Default and after the
curing or waiving of all such Events of Default that may have occurred:

                 (i) the duties and obligations of the Trustee shall be
         determined solely by the express provisions of this Indenture, and the
         Trustee shall not be liable except for the performance of such duties
         and obligations as are specifically set forth in this Indenture, and no
         implied covenants or obligations shall be read into this Indenture
         against the Trustee; and

                 (ii) in the absence of bad faith on the part of the Trustee,
         the Trustee may conclusively rely, as to the truth of the statements
         and the correctness of the opinions expressed therein, upon any
         statements, certificates or opinions furnished to the Trustee and
         conforming to the requirements of this Indenture; but in the case of
         any such statements, certificates or opinions which by any provision
         hereof are specifically required to be furnished to the Trustee, the
         Trustee shall be under a duty to examine the same to determine whether
         or not they conform to the requirements of this Indenture;

             (b) the Trustee shall not be liable for any error of judgment made
in good faith by a Responsible Officer or Responsible Officers of the Trustee,
unless it shall be proved that the Trustee was negligent in ascertaining the
pertinent facts; and

             (c) the Trustee shall not be liable with respect to any action
taken or omitted to be taken by it in good faith in accordance with the
direction of the Holders of not less than a majority in principal amount of the
Securities at the time Outstanding relating to the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising
any trust or power conferred upon the Trustee, under this Indenture.


                                       28

<PAGE>   33



             None of the provisions contained in this Indenture shall require
the Trustee to expend or risk its own funds or otherwise incur personal
financial liability in the performance of any of its duties or in the exercise
of any of its rights or powers, if there shall be reasonable ground for
believing that the repayment of such funds or adequate indemnity against such
liability is not reasonably assured to it.

         Section 5.2 Certain Rights of the Trustee.

         Subject to Section 5.1 hereof:

             (a) the Trustee may rely and shall be protected in acting or
refraining from acting upon any resolution, Officers' Certificate or any other
certificate (including, without limitation, any certificate provided to the
Trustee pursuant to Section 3.5 hereof), statement, instrument, opinion, report,
notice, request, consent, order, bond, debenture, note, coupon, security or
other paper document believed by it to be genuine and to have been signed or
presented by the proper party or parties;

             (b) any request, direction, order or demand of the Issuer mentioned
herein shall be sufficiently evidenced by an Officers' Certificate (unless other
evidence in respect thereof be herein specifically prescribed) and any
resolution of the Board of Directors may be evidenced to the Trustee by a copy
thereof certified by the Secretary or an Assistant Secretary of the Issuer;

             (c) the Trustee may consult with counsel and any advice or Opinion
of Counsel shall be full and complete authorization and protection in respect of
any action taken, suffered or omitted to be taken by it hereunder in good faith
and in accordance with such advice or Opinion of Counsel;

             (d) the Trustee shall be under no obligation to exercise any of the
trusts or powers vested in it by this Indenture at the request, order or
direction of any of the Securityholders pursuant to the provisions of this
Indenture, unless such Securityholders shall have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities
that might be incurred therein or thereby;

             (e) the Trustee shall not be liable for any action taken or omitted
by it in good faith and believed by it to be authorized or within the
discretion, rights or powers conferred upon it by this Indenture;

             (f) the Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, consent, order, approval,
appraisal, bond, debenture, note, coupon, security, or other paper or document
unless requested in writing so to do by the Holders of not less than a majority
in aggregate principal amount of the Securities then Outstanding; provided that,
if the payment


                                       29

<PAGE>   34


within a reasonable time to the Trustee of the costs, expenses or liabilities
likely to be incurred by it in the making of such investigation is, in the
opinion of the Trustee, not reasonably assured by the security afforded to it by
the terms of this Indenture, the Trustee may require reasonable indemnity
against such expenses or liabilities as a condition to proceeding; the
reasonable expenses of every such examination shall be paid by the Issuer, or by
the Trustee or any predecessor Trustee and repaid by the Issuer upon demand; and

             (g) the Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other paper or document, but
the Trustee, in its discretion, may make such further inquiry or investiga tion
into such facts or matters as it may see fit, and, if the Trustee shall
determine to make such further inquiry or investigation, it shall be entitled to
examine the books, records and premises of the Issuer, personally or by agent or
attorney.

         Section 5.3 Trustee Not Responsible for Recitals, Disposition of
Securities or Application of Proceeds Thereof.

         The recitals contained herein and in the Securities, except the
Trustee's certificates of authentication, shall be taken as the statements of
the Issuer, and the Trustee assumes no responsibility for the correctness of the
same. The Trustee makes no representation as to the validity or sufficiency of
this Indenture or of the Securities. The Trustee shall not be accountable for
the use or application by the Issuer or any of the Securities or of the proceeds
thereof.

         Section 5.4 Trustee and Agents May Hold Securities; Collections, etc.

         The Trustee or any agent of the Issuer or the Trustee, in its
individual or any other capacity, may become the owner or pledgee of Securities
with the same rights it would have if it were not the Trustee or such agent and
may otherwise deal with the Issuer and receive, collect, hold and retain
collections from the Issuer with the same rights it would have if it were not
the Trustee or such agent.

         Section 5.5 Moneys Held by Trustee.

         Subject to the provisions of Section 9.4 hereof, all moneys received by
the Trustee shall, until used or applied as herein provided, be held in trust
for the purposes for which they were received, but need not be segregated from
other funds except to the extent required by mandatory provisions of law.
Neither the Trustee nor any agent of the Issuer or the Trustee shall be under
any liability for interest on any moneys received by it hereunder, except as the
Issuer and the Trustee otherwise may agree.


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<PAGE>   35

         Section 5.6 Compensation and Indemnification of Trustee and Its Prior
Claim.

         The Issuer covenants and agrees to pay to the Trustee from time to time
as shall be agreed upon between the Issuer and the Trustee in writing from time
to time, and the Trustee shall be entitled to reasonable compensation (which
shall not be limited by any provision of law relating to the compensation of a
trustee of an express trust), and the Issuer covenants and agrees to pay or
reimburse the Trustee and each predecessor Trustee upon its request for all
reasonable expenses, disbursements and advances incurred or made by or on behalf
of it in accordance with any of the provisions of this Indenture (including the
reasonable compensation and expenses and disbursements of its counsel and of all
agents and other persons not regularly in its employ), except to the extent any
such expense, disbursement or advance may arise from the Trustee's negligence or
bad faith. The Issuer also covenants to indemnify the Trustee and each predeces
sor Trustee for, and to hold it harmless against, any and all loss, liability,
damage, claims or expense arising out of or in connection with the acceptance or
administration of this Indenture or the trusts hereunder and its duties
hereunder and the performance of its duties hereunder, including the costs and
expenses of defending and investigating any claim of liability in the premises,
except to the extent any such loss, liability or expense is due to its own
negligence or bad faith. The obligations of the Issuer under this Section 5.6 to
compensate and indemnify the Trustee and each predecessor Trustee and to pay or
reimburse the Trustee and each predecessor Trustee for expenses, disbursements
and advances shall constitute additional indebtedness hereunder and shall
survive the satisfaction and discharge of this Indenture.

         Section 5.7 Right of Trustee to Rely on Officers' Certificate, etc.

         Subject to Section 5.1 and Section 5.2 hereof, whenever in the
administration of the trusts of this Indenture the Trustee shall deem it
necessary or desirable that a matter be proved or established prior to taking or
suffering or omitting any action hereunder, such matter (unless other evidence
in respect thereof be herein specifically prescribed) may, in the absence of
negligence or bad faith on the part of the Trustee, be deemed to be conclusively
proved and established by an Officers' Certificate delivered to the Trustee.

         Section 5.8 Persons Eligible for Appointment as Trustee.

         The Trustee hereunder shall at all times be a corporation organized and
doing business under the laws of the United States or of a state thereof, having
a combined capital and surplus of at least $500,000,000, and which is authorized
under such laws to exercise corporate trust powers and subject to supervision or
examination by federal or state authority. If such corporation publishes reports
of condition at least annually, pursuant to law or to the require ments of a
federal, state or District of Columbia supervising or examining authority, then
for the purposes of this Section 5.8, the combined capital and surplus of such
corporation shall be deemed to be its combined capital and surplus as set forth
in its most recent report of condition so published. No obligor on the
Securities or Person directly or indirectly controlling, controlled by or under
common control with such obligor shall serve as Trustee.



                                       31

<PAGE>   36



         Section 5.9 Resignation and Removal; Appointment of Successor Trustee.

             (a) The Trustee may at any time resign by giving written notice of
resignation to the Issuer and by mailing notice thereof by first-class mail to
Holders of Securities at their last addresses as they shall appear on the
Securities Register. Upon receiving such notice of resignation, the Issuer shall
promptly appoint a successor trustee by written instrument in duplicate,
executed by authority of the Board of Directors, one copy of which instrument
shall be delivered to the resigning Trustee and one copy to the successor
Trustee. If no such successor trustee shall have been so appointed and have
accepted appointment within 30 days after the mailing of such notice of
resignation, the resigning Trustee may petition any court of competent
jurisdiction for the appointment of a successor trustee, or any Securityholder
who has been a bona fide Holder of a Security or Securities for at least six
months may, on behalf of himself and all others similarly situated, petition any
such court for the appointment of a successor trustee. Such court may thereupon,
after such notice, if any, as it may deemed proper and prescribe, appoint a
successor trustee.

             (b) In case at any time any of the following shall occur:

                 (i) the Trustee shall fail to comply with the provisions of
         Section 310(b) of the Trustee Indenture Act, after written request
         thereafter by the Issuer or by any Securityholder who has been a bona
         fide Holder of a Security or Securities for at least six months;

                 (ii) the Trustee shall cease to be eligible in accordance with
         the provisions of Section 5.8 hereof and shall fail to resign after
         written request therefor by the Issuer or by any such Securityholder;
         or

                 (iii) the Trustee shall become incapable of acting, or shall be
         adjudged a bankrupt or insolvent, or a receiver or liquidator of the
         Trustee or of its property shall be appointed, or any public officer
         shall take charge or control of the Trustee or of its property or
         affairs for the purpose of rehabilitation, conservation or liquidation;

then, in any such case, the Issuer may remove the Trustee and appoint a
successor trustee by written instrument, in duplicate, executed by order of the
Board of Directors of the Issuer, one copy of which instrument shall be
delivered to the Trustee so removed and one copy of which shall be delivered to
the successor trustee, or, any Securityholder who has been a bona fide Holder of
a Security or Securities for at least six months may on behalf of himself and
all others similarly situated, petition any court of competent jurisdiction for
the removal of the Trustee and the appointment of a successor trustee. Such
court may thereupon, after such notice, if any, as it may deem proper and
prescribe, remove the Trustee and appoint a successor trustee.


                                       32

<PAGE>   37

             (c) The Holders of a majority in aggregated principal amount of the
Securities at the time Outstanding may at any time remove the Trustee and
appoint a successor trustee by delivering to the Trustee so removed, to the
successor trustee so appointed and to the Issuer the evidence provided for in
Section 6.1 hereof of the action in that regard taken by the Securityholders.

             (d) Any resignation or removal of the Trustee and any appointment
of a successor trustee pursuant to any of the provisions of this Section 5.9
shall become effective only upon acceptance of appointment by the successor
trustee as provided in Section 5.10 hereof.

         Section 5.10 Acceptance of Appointment by Successor Trustee.

         Any successor trustee appointed as provided in Section 5.9 hereof shall
execute and deliver to the Issuer and to its predecessor Trustee an instrument
accepting such appointment hereunder, and thereupon the resignation or removal
of the predecessor Trustee shall become effective and such successor trustee,
without any further act, deed or conveyance, shall become vested with all
rights, powers, duties and obligations of its predecessor hereunder, with like
effect as if originally named as trustee herein; but, nevertheless, on the
written request of the Issuer or of the successor trustee, upon payment of its
charges then unpaid, the Trustee ceasing to act shall, subject to Section 9.4
hereof, pay over the successor trustee all moneys at the time held by it
hereunder and shall execute and deliver an instrument transferring to such
successor trustee all such rights, powers, duties and obligations. Upon request
of any such successor trustee, the Issuer shall execute appropriate instruments
in writing for more fully and certainly vesting in and confirming to such
successor such rights and powers. Any Trustee ceasing to act shall, neverthe
less, retain a prior claim upon all property or funds held or collected by such
Trustee to secure any amounts then due it pursuant to the provisions of Section
5.6 hereof.

         Upon acceptance of appointment by a successor trustee as provided in
this Section 5.10, the Issuer shall mail notice thereof by first-class mail to
the Holders of Securities at their last addresses as they shall appear in the
Securities Register. If the acceptance of appoint ment is substantially
contemporaneous with the resignation then the notice called for by the preceding
sentence may be combined with the notice called for by Section 5.9 hereof. If
the Issuer fails to mail such notice within 10 days after acceptance of
appointment by the successor trustee, the successor trustee shall cause such
notice to be mailed at the expense of the Issuer.

         Notwithstanding replacement of the Trustee pursuant to this Section
5.10, the Issuer's obligations under Section 5.6 hereof shall continue for the
benefit of the retiring Trustee.

         Section 5.11 Merger, Conversion, Consolidation or Succession to
Business of Trustee.

         Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any merger,
conversion or



                                       33
<PAGE>   38

consolidation to which the Trustee shall be a party, or any corporation
succeeding to the corporate trust business of the Trustee, shall be the
successor of the Trustee hereunder, provided that such corporation shall be
eligible under the provisions of Section 5.8 hereof, without the execution or
filing of any paper or any further act on the part of any of the parties hereto,
anything herein to the contrary notwithstanding.

         In case at the time such successor to the Trustee shall succeed to the
trusts created by this Indenture, any of the Securities shall have been
authenticated but not delivered, any such successor to the Trustee may adopt the
certificate of authentication of any predecessor Trustee and deliver such
Securities so authenticated and, in case at that time any of the Securities
shall not have been authenticated, any successor to the Trustee may authenticate
such Securities either in the name of any predecessor hereunder or in the name
of the successor trustee, and in such cases such certificate shall have the full
force which it is anywhere in the Securities or in this Indenture provided that
the certificate of the Trustee shall have; provided, that the fight to adopt the
certificate of authentication of any predecessor Trustee or to authenticate
Securities in the name of any predecessor Trustee shall apply only to its
successor or successors by merger, conversion or consolidation.


                                   ARTICLE VI

                         CONCERNING THE SECURITYHOLDERS

         Section 6.1 Evidence of Action Taken by Securityholders.

         Any request, demand, authorization, direction, notice, consent, waiver
or other action provided by this Indenture to be given or taken by
Securityholders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Securityholders, in person or by
agent duly appointed in writing; and, except as herein otherwise expressly
provided, such action shall become effective when such instrument or instruments
are delivered to the Trustee. Proof of execution of any instrument or of a
writing appointing any such agent shall be sufficient for any purpose of this
Indenture and (subject to Section 5.1 and Section 5.2 hereof) conclusive in
favor of the Trustee and the Issuer, if made in the manner provided in this
Article.

         Section 6.2 Proof of Execution of Instruments and of Holding of
Securities Record Date.

         Subject to Section 5.1 and Section 5.2 hereof, the execution of any
instrument by a Securityholder or his agent or proxy may be provided in
accordance with such reasonable rules and regulations as may be prescribed by
the Trustee or in such manner as shall be satisfactory to the Trustee. The
holding of Securities shall be provided by the Securities Register or by a
certificate of the Security Registrar thereof. The Issuer may set a record date
for purposes of

                                       34

<PAGE>   39


determining the identity of Holders of Securities entitled to vote or consent to
any action referred to in Section 6.1 hereof, which record date may be set at
any time or from time to time by notice to the Trustee for any date or dates (in
the case of any adjournment or resolicitation) not more than 60 days nor less
than five days prior to the proposed date of such vote or consent, and
thereafter, notwithstanding any other provisions hereof, only Holders of
Securities of record on such record date shall be entitled to so vote or give
such consent or to withdraw such vote or consent.

         Section 6.3 Holders to Be Treated as Owners.

         The Issuer, the Trustee and any agent of the Issuer or the Trustee may
deem and treat the Person in whose name any Security shall be registered upon
the Securities Register as the absolute owner of such Security (whether or not
such Security shall be overdue and notwith standing any notation of ownership or
other writing thereon) for the purpose of receiving payment of or on account of
the principal and Change of Control purchase price of, and premium, if any, on
and, subject to the provisions of this Indenture, interest on such Security and
for all other purposes; and neither the Issuer nor the Trustee nor any agent of
the Issuer or the Trustee shall be affected by any notice to the contrary. All
such payments so made to any such Person, or upon his order, shall be valid and
to the extent of the sum or sums so paid, effectual to satisfy and discharge the
liability for moneys payable upon any such Security.

         Section 6.4 Securities Owned by Issuer Deemed Not Outstanding.

         In determining whether the Holders of the requisite aggregate principal
amount of Securities have concurred in any direction, consent or waiver under
this Indenture, Securities that are owned by the Issuer or any other obligor on
the Securities or by any Person directly or indirectly controlling or controlled
by or under direct or indirect common control with the obligor on the Securities
shall be disregarded and deemed not to be Outstanding for the purpose of any
such determination, except that for the purpose of determining whether the
Trustee shall be protected in relying on any such direction, consent or waiver
only Securities that the Trustee knows are so owned shall be so disregarded.
Securities so owned that have been pledged in good faith may be regarded as
Outstanding if the pledgee establishes to the satisfaction of the Trustee the
pledgee's right so to act with respect to such Securities and that the pledgee
is not the Issuer or any other obligor upon the Securities or any Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with the Issuer or any other obligor on the Securities. In case
of a dispute as to such right, the advice of counsel shall be full protection in
respect of any decision made by the Trustee in accordance with such advice. Upon
request of the Trustee, the Issuer shall furnish to the Trustee promptly an
Officers' Certificate listing and identifying all Securities, if any, known by
the Issuer to be owned or held by or for the account of any of the
above-described Persons; and, subject to Section 5.1 and Section 5.2 hereof, the
Trustee shall be entitled to accept such Officers' Certificate as conclusive
evidence of the facts therein set forth and of the facts therein set forth and
of the fact that all Securities not listed therein are Outstanding for the
purpose of any such determination.

                                       35

<PAGE>   40



         Section 6.5 Right of Revocation of Action Taken.

         At any time prior to (but not after) the evidencing to the Trustee, as
provided in Section 6.1 hereof, of the taking of any action by the Holders of
the percentage in aggregate principal amount of the Securities specified in this
Indenture in connection with such action, any Holder of a Security the serial
number of which is shown by the evidence to be included among the serial numbers
of the Securities, the Holders of which have consented to such action may, by
filing written notice at the Corporate Trust Office and upon proof of holding as
provided in this Article, revoke such action so far as concerns such Security.
Except as aforesaid any such action taken by the Holder of any Security shall be
conclusive and binding upon such Holder and upon all future Holders and owners
of such Security and of any Securities issued in exchange or substitution
therefor, irrespective of whether or not any notation in regard thereto is made
upon any such Security. Any action taken by the Holders of the percentage in
aggregate principal amount of the Securities specified in this Indenture in
connection with such action shall be conclusively binding upon the Issuer, the
Trustee and the Holders of all such Securities.


                                   ARTICLE VII

                             SUPPLEMENTAL INDENTURES

         Section 7.1 Supplemental Indentures Without Consent of Securityholders.

         The Issuer, when authorized by a resolution of its Board of Directors,
and the Trustee may from time to time and at any time enter into an indenture or
indentures supplemental hereto for one or more of the following purposes:

             (a) to convey, transfer, assign, mortgage or pledge to the Trustee
as security for the Securities any property or assets;

             (b) to evidence the succession of another corporation to the
Issuer, or successive successions, and the assumption by the successor
corporation of the covenants, agreements and obligations of the Issuer pursuant
to Article Eight hereof;

             (c) to add to the covenants of the Issuer such further covenants,
restrictions, conditions or provisions as the Board of Directors shall consider
to be for the protection of the Holders of Securities, and to make the
occurrence, or the occurrence and continuance of a default in any such
additional covenants, restrictions, conditions or provisions an Event of Default
permitting the enforcement of all or any of the several remedies provided in
this Indenture as herein set forth; provided, that in respect of any such
additional covenant, restriction, condition or provision such supplemental
indenture may provide for a particular period of grace after default (which
period may be shorter or longer than that allowed in the case


                                       36

<PAGE>   41

of other defaults) or may provide for immediate enforcement upon such an Event
of Default or may limit the remedies available to the Trustee due solely to such
an Event of Default or may limit the right of the Holders of a majority in
aggregate principal amount of the Securities to waive such an Event of Default;


             (d) to cure any ambiguity or to cure, correct or supplement any
defective provision contained herein or in the Securities, or to make such other
provisions in regard to matters or questions arising under this Indenture or
under any supplemental indenture as the Board of Directors may deem necessary or
desirable, and in any case which the Trustee and the Issuer shall determine (i)
are not inconsistent with this Indenture and the Securities and (ii) shall not
adversely affect the interests of the Holders of the Securities; and

             (e) to modify or supplement this Indenture or any indenture supple
mental hereto in such manner as to permit the qualification thereof under the
Trust Indenture Act of any other similar federal statute hereafter in effect.

             The Trustee is hereby authorized to join in the execution of any
such supplemental Indenture, to make any further appropriate agreements and
stipulations that may be therein continued and to accept the conveyance,
transfer, assignment, mortgage or pledge of any property thereunder, but the
Trustee shall not be obligated to enter into any such supplemental indenture
that affects the Trustee's own rights, duties or immunities under this Indenture
or otherwise.

             Any supplemental indenture authorized by the provisions of this
Section 7.1 may be executed without the consent of the Holders of any of the
Securities at the time Outstanding, notwithstanding any of the provisions of
Section 7.2 hereof.

         Section 7.2 Supplemental Indentures With Consent of Securityholders.

         With the consent (evidenced as provided in Article Six hereof) of the
Holders of not less than a majority in aggregate principal amount of the
Securities at the time Outstanding, the Issuer, when authorized by a resolution
of its Board of Directors, and the Trustee may, from time to time and at any
time, modify this Indenture or any indentures supplemental hereto or the rights
of the Holders of the Securities; provided, that no such supplemental indenture
shall (a) change the Stated Maturity of the principal of, or any installment of
principal of or interest on, any Security, or reduce the principal amount
thereof, or reduce the rate or extend the time of payment of interest thereon,
or reduce any amount payable on redemption thereof or upon a Change of Control
or impair or affect the right of any Securityholder to institute suit for the
payment thereof or make any change to Section 3.9 hereof that adversely affects
the rights of the Holders of the Securities, in each case without the consent of
the Holder of each Security so affected, or (b) without the consent of the
Holders of all Securities then Outstanding, (i) reduce the aforesaid percentage
of Securities, the consent of the Holders of which is


                                       37

<PAGE>   42

required for any such modification, or the percentage of Securities, the consent
of the Holders of which is required for any waiver provided for in this
Indenture, (ii) change any obligation of the Issuer to maintain an office or
agency in the places and for the purposes specified in Section 3.2 or (iii) make
any change in Section 4.9 or this Section 7.2, except to increase any
percentages or to provide that certain other provisions of this Indenture cannot
be modified or waived without the consent of the Holders of each Outstanding
Security affected thereby.
         Upon the request of the Issuer, accompanied by a copy of a resolution
of the Board of Directors certified by the Secretary or an Assistant Secretary
of the Issuer authorizing the execution of any such supplemental indenture, and
upon the filing with the Trustee of evidence of the consent of Securityholders
and other documents, if any, required by Section 6.1 hereof the Trustee shall
join with the Issuer in the execution of such supplemental indenture unless such
supplemental indenture affects the Trustee's own rights, duties or immunities
under this Indenture or otherwise, in which case the Trustee may in its
discretion, but shall not be obligated to enter into such supplemental
indenture.

         It shall not be necessary for the consent of the Securityholders under
this Section 7.2 to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such consent shall approve the
substance thereof.

         Promptly after the execution by the Issuer and the Trustee of any
supplemental indenture pursuant to the provisions of this Section 7.2, the
Issuer shall mail a notice thereof by first-class mail to the Holders of
Securities at their addresses as they shall appear on the Securities Register,
setting forth in general terms the substance of such supplemental indenture. Any
failure of the Issuer to mail such notice, or any defect therein, shall not,
however, in any way impair or affect the validity of any such supplemental
indenture.

         Section 7.3 Effect of Supplemental Indenture.

         Upon the execution of any supplemental indenture pursuant to the
provisions hereof, this Indenture shall be and be deemed to be modified and
amended in accordance therewith and the respective rights, limitations of
rights, obligations, duties and immunities under this Indenture of the Trustee,
the Issuer and the Holders of Securities shall thereafter be deter mined,
exercised and enforced hereunder subject in all respects to such modifications
and amendments, and all the terms and conditions of any such supplemental
indenture shall be and be deemed to be part of the terms and conditions of this
Indenture for any and all purposes.

         Section 7.4 Documents to Be Given to Trustee.

         The Trustee, subject to the provisions of Section 5.1 and Section 5.2
hereof, may receive an Officers' Certificate and an Opinion of Counsel as
conclusive evidence that any such supplemental indenture complies with the
applicable provisions of this Indenture.

         Section 7.5 Notation of Securities in Respect of Supplemental
Indentures.


                                       38

<PAGE>   43



         Securities authenticated and delivered after the execution of any
supplemental indenture pursuant to the provisions of this Article Seven may bear
a notation in form approved by the Trustee as to any matters provided for by
such supplemental indenture or as to any action taken at any such meeting by the
Issuer or the Trustee shall so determine, new Securities so modified as to
conform, in the opinion of the Trustee and the Board of Directors, to any
modification of this Indenture contained in any such supplemental indenture may
be prepared by the Issuer, authenticated by the Trustee and delivered in
exchange for the Securities then Outstanding.


                                  ARTICLE VIII

                    CONSOLIDATION, MERGER, SALE OR CONVEYANCE

         Section 8.1 Covenant Not to Merge, Consolidate, Sell or Transfer Assets
Except Under Certain Conditions.

             (a) The Issuer shall not consolidate with or merge into any other
Person, or sell, convey, transfer or lease its properties and assets
substantially as an entirety to any Person, and Issuer shall not permit any
Person to consolidate with or merge into the Issuer, unless: (i) immediately
prior to and immediately following such consolidation, merger, sale or lease, no
Event of Default shall have occurred and be continuing and (ii) the Issuer is
the surviving or continuing corporation, or the surviving or continuing
corporation or corporation that acquires by sale, conveyance, transfer or lease
is incorporated in the United States of America or Canada and expressly assumes
the payment and performance of all obligations of the Issuer under the Indenture
and the Securities.

             (b) Except for the sale of the properties and assets of the Issuer
substantially as an entirety pursuant to subsection (a) above, and other than
assets required to be sold to conform with governmental regulations, the Issuer
shall not sell or otherwise dispose of any assets (other than short-term,
readily marketable investments purchased for cash manage ment purposes with
funds not representing the proceeds of other asset sales) if on a pro forma
basis, the aggregate net book value of all such sales during the most recent
12-month period would exceed 10 percent of Consolidated Net Tangible Assets
computed as of the end of the most recent fiscal quarter preceding such sale;
provided, however, that any such sales shall be disregarded for purposes of this
10 percent limitation if the proceeds are invested in assets in similar or
related lines of business of the Issuer and, provided further, that the Issuer
may sell or otherwise dispose of assets in excess of such 10 percent if the
proceeds from such sales or dispositions, which are not reinvested as provided
above, are retained by the Issuer as cash or cash equivalents or are used by the
Issuer to purchase Securities, 1996 Senior Notes or 1997 Senior Notes which are
then delivered to the Trustee for cancellation or are used to reduce or retire
Indebtedness ranking pari passu in right of payment to the Securities.


                                       39

<PAGE>   44

         Section 8.2 Successor Corporation Substituted.

         In case of any such consolidation, merger, sale or transfer, and
following such an assumption by the successor corporation, such successor
corporation shall succeed to and be substituted for the Issuer, with the same
effect as if it had been named herein.
         Such successor corporation may cause to be signed, and may issue either
in its own name or in the name of the Issuer prior to such succession any or all
of the Securities issuable hereunder that theretofore shall not have been signed
by the Issuer and delivered to the Trustee; and, upon the order of such
successor corporation, instead of the Issuer, and subject to all the terms,
conditions and limitations in this Indenture prescribed, the Trustee shall
authenti cate and shall deliver any Securities that previously shall have been
signed and delivered by the officers of the Issuer to the Trustee for
authentication and any Securities that such successor corporation thereafter
shall cause to be signed and delivered to the Trustee for that purpose. All of
the Securities so issued shall in all respects have the same legal rank and
benefit under this Indenture as the Securities theretofore or thereafter issued
in accordance with the terms of this Indenture as though all of such Securities
had been issued at the date of the execution hereof.

         In case of any such consolidation, merger, sale or transfer such
changes in phraseology and form (but not in substance) may be made in the
Securities thereafter to be issued as may be appropriate.

         In the event of any such sale or transfer (other than a transfer by way
of lease) the Issuer or any successor corporation which shall theretofore have
become such in the manner described in this Article 8 shall be discharged from
all obligations and covenants under this Indenture and the Securities and may be
liquidated and dissolved.

         Section 8.3 Opinion of Counsel to Trustee; Officers' Certificate.

         The Trustee, subject to the provisions of Section 5.1 and Section 5.2
hereof, shall receive an Officers' Certificate and an Opinion of Counsel as
conclusive evidence that any such consolidation, merger, sale or transfer, and
any such assumption, and any such liquidation or dissolution, complies with the
applicable provisions of this Indenture.


                                   ARTICLE IX

                           SATISFACTION AND DISCHARGE
                         OF INDENTURE; UNCLAIMED MONEYS

         Section 9.1 Satisfaction and Discharge of Indenture.


                                       40

<PAGE>   45

         If at any time (a) the Issuer shall have paid or caused to be paid the
principal and Change of Control purchase price of and premium, if any, and
interest on all the Securities Outstanding hereunder, as and when the same shall
have become due and payable, or (b) the Issuer shall have delivered to the
Trustee for cancellation of all Securities theretofore authenti cated (other
than any Securities which shall have been destroyed, lost or stolen and which
shall have been replaced or paid as provided in Section 2.7 hereof) or (c)(i)
all such Securities not theretofore delivered to the Trustee for cancellation
shall have become due and payable, or are by their terms to become due and
payable within one year or are to be called for redemption under arrangements
satisfactory to the Trustee for the giving of notice of redemption, and (ii) the
Issuer shall have irrevocably deposited or caused to be deposited with the
Trustee as trust funds the entire amount in cash (other than moneys repaid by
the Trustee or any paying agent to the Issuer in accordance with Section 9.4
hereof) or U.S. Government Obligations, maturing as to principal, premium, if
any, and interest in such amounts and at such times as will insure (without
reinvest ment) the liability of cash sufficient, in the opinion of a nationally
recognized firm of independ ent public accountants expressed in a written
certification thereof delivered to the Trustee, to pay at maturity all such
Securities not theretofore delivered to the Trustee for cancellation, including
principal, premium, if any, and interest due or to become due to such date of
maturity as the case may be, and if, in any such case, the Issuer shall also pay
or cause to be paid all other sums payable hereunder by the Issuer, then this
Indenture shall cease to be of further effect (except as to (i) rights of
registration of transfer and exchange, and the Issuer's right to optional
redemption, (ii) substitution of apparently mutilated, defaced, destroyed, lost
or stolen Securities, (iii) rights of Holders to receive payments of principal
thereof (including any Change of Control purchase price previously accrued) and
premium, if any, and interest thereon, upon the original stated due dates
therefor (but not upon acceleration), (iv) the rights and obligations and
immunities of the Trustee hereunder and (v) the rights of the Securityholders as
beneficiaries hereof with respect to the property so deposited with the Trustee
payable to all or any of them), and the Trustee, on demand of the Issuer
accompanied by an Officers' Certificate and an Opinion of Counsel and at the
cost and expense of the Issuer, shall execute proper instruments acknowledging
such satisfaction of and discharging this Indenture; provided that the rights of
Holders of the Securi ties to receive amounts in respect of principal of and
premium, if any, and interest or the Securities held by them shall not be
delayed longer than required by then applicable mandatory rules or policies of
any securities exchange upon which the Securities are listed.

         The Issuer agrees to reimburse the Trustee for any costs or expenses
thereafter reasonably and properly incurred and to compensate the Trustee for
any services thereafter reasonably and properly rendered by the Trustee in
connection with this Indenture or the Securities.

         Section 9.2 Application by Trustee of Funds Deposited for Payment of
Securities.



                                       41

<PAGE>   46

         Subject to Section 9.4 hereof, all moneys deposited with the Trustee
pursuant to Section 9.1 hereof shall be held in trust and applied, by it to the
payment, either directly or through any paying agent (including the Issuer
acting as its own paying agent), to the Holders of the particular Securities for
the payment or redemption of which such moneys have been deposited with the
Trustee, of all sums due and to become due thereon for principal and Change of
Control purchase price, premium, if any, and interest; but such money need not
be segregated from other funds except to the extent required by law.


         Section 9.3 Repayment of Moneys Held by Paying Agent.

         In connection with the satisfaction and discharge of this Indenture all
moneys then held by any paying agent under the provisions of this Indenture
shall, upon demand of the Issuer, be repaid to it or paid to the Trustee and
thereupon such paying agent shall be released from all further liability with
respect to such moneys.

         Section 9.4 Return of Moneys Held by Trustee and Paying Agent Unclaimed
for Two Years.

         Any moneys deposited with or paid to the Trustee or any paying agent
for the payment of the principal or Change of Control purchase price of or
premium or interest on any Security and not applied but remaining unclaimed for
two years after the date upon which such principal, Change of Control purchase
price, premium or interest shall have become due and payable shall, upon the
written request of the Issuer, be repaid to the Issuer by the Trustee or such
paying agent, and the Holder of such Security shall, unless otherwise required
by mandatory provisions of applicable escheat or abandoned or unclaimed property
laws, thereafter look only to the issuer for any payment which such Holder may
be entitled to collect, and all liability of the Trustee or any paying agent
with respect to such moneys shall thereupon cease.

         Section 9.5 Defeasance and Discharge of Indenture.

         The Issuer will be deemed to have paid and will be discharged from any
and all obligations in respect of the Securities, on the 91st day after the
deposit referred to in subpara graph (A) hereof has been made, and the
provisions of this Indenture will no longer be in effect with respect to the
Securities (and the Trustee, at the expense of the Issuer, shall execute proper
instruments acknowledging the same), except as to:

             (a) rights of registration of transfer and exchange, and the
Issuer's right of optional redemption, (b) substitution of apparently mutilated,
defaced, destroyed, lost or stolen securities, (c) rights of Holders to receive
payments of principal (including rights to receive any Change of Control
purchase price previously accrued) thereof and premium, if any, and interest
thereon, (d) the rights, obligations and immunities of the Trust hereunder, (e)
the rights of the Securityholders as beneficiaries hereof with respect to the
property so deposited with the Trustee payable to all or any of them and (f) the
obligations of the Issuer to maintain a place of payment


                                       42

<PAGE>   47

for the Securities under Section 3.1 hereof; provided that the following
conditions shall have been satisfied:

                 (A) with reference to this Section 9.5 the Issuer has
irrevocably deposited or caused to be irrevocably deposited with the Trustee (or
another trustee satisfying the requirements of Section 5.8 hereof) as trust
funds in trust, specifically pledged as security for, and dedicated solely to,
the benefit of the Holders of the Securities, (i) money in an amount, or (ii)
U.S. Government Obligations which through the payment of interest and principal
in respect thereof in accordance with their terms (without reinvestment) will
provide not later than one day before the due date of any payment referred to in
clause (x) or (y) of this subparagraph (A) money in an amount, or (iii) a
combination thereof, sufficient, in the opinion of a nationally recognized firm
of independent public accountants expressed in a written certifica tion thereof
delivered to the Trustee, to pay and discharge, after payment of all federal,
state and local taxes or other charges and assessments in respect thereof
payable by the Trustee, (x) the principal and Change of Control purchase price
of, premium, if any, and each installment of principal and interest on the
Outstanding Securities at the maturity date of such principal or installment of
principal or interest and (y) any mandatory sinking fund payments or analogous
payments applicable to the Securities on the day on which such payments are due
and payable in accordance with the terms of this Indenture and the Securities;

                 (B) the Issuer has delivered to the Trustee (i) an Opinion of
Counsel to the effect that Holders will not recognize income, gain or loss for
federal income tax purposes as a result of the Issuer's exercise of its option
under this Section 9.5 and will be subject to federal income tax on the same
amount and in the same manner and at the same times as would have been the case
if such deposit, defeasance and discharge had not occurred, which Opinion of
Counsel must be based on (x) a change in applicable federal income tax law or
related Treasury Regulations after the date of this Indenture or (y) a ruling
received by the Issuer from the Internal Revenue Service to the same effect and
(ii) an Opinion of Counsel to the effect that the defeasance trust does not
constitute an "investment company" under the Investment Company Act of 1940, as
amended, and after the passage of 123 days following the deposit, the trust fund
will not be subject to the effect of Section 547 of the U.S. Bankruptcy Code or
Section 15 of the New York Debtor and Creditor Law;

                 (C) immediately after giving effect to such deposit on a pro
forma basis, no Event of Default, or event that after the giving of notice or
lapse of time or both would become an Event of Default, shall have occurred and
be continuing on the date of such deposit or during the period ending on the
123rd day after the date of such deposit, and such deposit shall not result in a
breach or violation of, or constitute a default under, any other agreement or
instrument to which the Issuer is a party or by which the Issuer is bound; and

                 (D) if at such time the Securities are listed on a national
securities exchange, the Issuer has delivered to the Trustee an Opinion of
Counsel to the effect that the Securities will not be delisted as a result of
such deposit, defeasance and discharge.


                                       43

<PAGE>   48



         Section 9.6 Defeasance of Certain Obligations.

         The Issuer may omit to comply with any term, provision, or condition
set forth in this Indenture in Sections 3.8 and Section 3.9, and Section 4.l(d)
(with respect to Sections 3.8 and 3.9) and Sections 4.1(c) and (e) shall be
deemed not to be Events of Default on the 123rd day after the deposit referred
to in subparagraph (A) hereof if:
                 (A) with reference to this Section 9.6, the Issuer has
irrevocably deposited or caused to be irrevocably deposited with the Trustee (or
another trustee satisfying the requirements of Section 5.6 hereof) as trust
funds in trust, specifically pledged as security for, and dedicated solely to,
the benefit of the Holders of the Securities, (i) money in an amount, or (ii)
U.S. Government Obligations which bought the payment of interest and principal
in respect thereof in accordance with their terms (without reinvestment) will
provide not later than one day before the due date of any payment referred to in
clauses (x) or (y) of this Section 9.6, money in an amount, or (iii) a
combination thereof, sufficient, in the opinion of a nationally recognized firm
of independent public accountants expressed in a certification thereof delivered
to the Trustee, to pay and discharge, after payment of all federal, state and
local taxes or other charges and assessments in respect thereof payable by the
Trustee, (x) the principal and Change of Control purchase price of, premium, if
any, and each installment of principal and interest on the Outstanding
Securities at the maturity date of such principal or installment of principal or
interest and (y) any mandatory sinking fund payments or analogous payments
applicable to the Securities on the day on which such payments are due and
payable in accordance with the terms of this Indenture and the Securities;

                 (B) the Issuer has delivered to the Trustee (i) an Opinion of
Counsel to the effect that Holders will not recognize income, gain or loss for
federal income tax purposes as a result of the Issuer's exercise of its option
under this Section 9.6 and will be subject to federal income tax on the same
amount and in the same manner and at the same times as would have been the case
if such deposit, defeasance and discharge had not occurred, and (ii) an Opinion
of Counsel to the effect that the defeasance trust does not constitute an
"investment company" under the Investment Company Act of 1940, as amended, and
after the passage of 123 days following the deposit, the trust fund will not be
subject to the effect of Section 547 of the U.S. Bankruptcy Code or Section 15
of the New York Debtor and Creditor Law;

                 (C) immediately after giving effect to such deposit on a pro
forma basis, no Event of Default, or event that after the giving of notice or
lapse of time or both would become an Event of Default, shall have occurred and
be continuing on the date of such deposit or during the period ending on the
123rd day after the date of such deposit, and such deposit shall not result in a
breach or violation of or constitute a default under any other agreement or
instrument to which the Issuer is a party or by which the Issuer is bound; and




                                       44

<PAGE>   49

                 (D) if at such time the Securities are listed on a national
securities exchange, the Issuer has delivered to the Trustee an Opinion of
Counsel to the effect that the Securities will not be delisted as a result of
such deposit, defeasance and discharge.


                                    ARTICLE X

                            MISCELLANEOUS PROVISIONS

         Section 10.1 Incorporators, Shareholders, Officers and Directors of
Issuer Exempt from Individual Liability.

         No recourse under or upon any obligation, covenant or agreement
contained in this Indenture, or in any Security, or because of any indebtedness
evidenced thereby, shall be had against any incorporator, as such, or against
any past, present or future shareholder, officer or director, as such, of the
Issuer or of any successor, either directly or through the Issuer or any
successor, under any rule of law, statute or constitutional provision or by the
enforcement of any assessment or by any legal or equitable proceeding or
otherwise, all such liability being expressly waived and released by the
acceptance of the Securities by the Holders thereof and as part of the
consideration for the issue of the Securities.

         Section 10.2 Provisions of the Indenture for the Sole Benefit of
Parties and Securityholders.

         Nothing in this Indenture or in the Securities, expressed or implied,
shall give or be construed to give to any Person, other than the parties hereto
and their successors and the Holders (and, where expressly set forth herein,
owners of interests in any Global Security), any legal or equitable right,
remedy or claim under this Indenture or under any covenant or provision herein
contained, all such covenants and provisions being for the sole benefit of the
parties hereto and their successors and the Holders (and, where expressly set
forth herein, owners of interests in any Global Security).

         Section 10.3 Successors and Assigns of Issuer Bound by Indenture.

         All the covenants, stipulations, promises and agreements in this
Indenture contained by or in behalf of the Issuer shall bind its successors and
assigns, whether so expressed or not.

         Section 10.4 Notices and Demands on Issuer, Trustee and
Securityholders.

         Any notice or demand which by any provision of this Indenture is
required or permitted to be given or served by the Trustee or by the Holders to
or on the Issuer may be given or served by being deposited postage prepaid,
first-class mail (except as otherwise specifically


                                       45

<PAGE>   50


provided herein) addressed (until another address of the Issuer is filed by the
Issuer with the Trustee) to NRG Energy, Inc., 1221 Nicollet Mall, Suite 700,
Minneapolis, Minnesota 55403, Attention: Chief Financial Officer. Any notice,
direction, request or demand by the Issuer or any Securityholder to or upon the
Trustee shall be deemed to have been sufficiently given or made, for all
purposes, if given or made at the Corporate Trust Office or such office or
agency designated for such purpose in Section 3.2 hereof.

         Where this Indenture provides for notice to Holders, such notice shall
be sufficiently given (unless otherwise herein expressly provided) if in writing
and mailed, first-class postage prepaid, to each Holder entitled thereto, at his
last address as it appears in the Securities Register. In any case where notice
to Holders is given by mail, neither the failure to mail such notice, nor any
defect in any notice so mailed, to any particular Holder shall affect the
sufficiency of such notice with respect to other Holders. Where this Indenture
provides for notice in any manner, such notice may be waived in writing by the
Person entitled to receive such notice, either before or after the event, and
such waiver shall be the equivalent of such notice. Waivers of notice by Holders
shall be filed with the Trustee, but such filing shall not be a condition
precedent to the validity of any action taken in reliance upon such waiver.

         In case, by reason of the suspension of or irregularities in regular
mail service, it shall be impracticable to mail notice to the Issuer and
Securityholders when such notice is required to be given pursuant to any
provision of this Indenture, then any manner of giving such notice as shall be
satisfactory to the Trustee shall be deemed to be a sufficient giving of such
notice.

         Section 10.5 Officers' Certificates and Opinions of Counsel, Statements
to Be Contained Therein.

         Upon any application or demand by the Issuer to the Trustee to take any
action under any of the provisions of this Indenture, the Issuer shall furnish
to the Trustee an Officers' Certificate stating that all conditions precedent
provided for in this Indenture relating to the proposed action have been
complied with and an Opinion of Counsel stating that in the opinion of such
counsel all such conditions precedent have been complied with, except that in
the case of any such application or demand as to which the furnishing of such
documents is specifically required by any provision of this Indenture relating
to such particular application or demand, no additional certificate or opinion
need be furnished.

         Each certificate or opinion provided for in this Indenture and
delivered to the Trustee with respect to compliance with a condition or covenant
provided for in this Indenture shall include (a) a statement that the Person
making such certificate or opinion has read such covenant or condition, (b) a
brief statement as to the nature and scope of the examination or investigation
upon which the statements or opinions contained in such certificate or opinion
are based, (c) a statement that, in the opinion of such Person, he has made such
examination or investigation as is necessary to enable him to express an
informed opinion as to whether or not



                                       46

<PAGE>   51

such covenant or condition has been complied with and (d) a statement as to
whether or not, in the opinion of such Person, such condition or covenant has
been complied with.


         Any certificate, statement or opinion of an officer of the Issuer may
be based, insofar as it relates to legal matters, upon a certificate or opinion
of or representations by counsel, unless such officer knows that the certificate
or opinion or representations with respect to the matters upon which his
certificate, statement or opinion may be based as aforesaid are erroneous, or in
the exercise of reasonable care should know that the same are erroneous. Any
certificate, statement or Opinion of Counsel may be based, insofar as it relates
to factual matters (informa tion with respect to which is in the possession of
the Issuer) upon the certificate, statement or opinion of or representations by
an officer or officers of the Issuer, unless such counsel knows that the
certificate, statement or opinion or representations with respect to the matters
upon which his certificate, statement or opinion may be based as aforesaid are
erroneous, or in the exercise of reasonable care should know that the same are
erroneous.

         Any certificate, statement or opinion of an officer of the Issuer or of
counsel may be based, insofar as it relates to accounting matters, upon a
certificate or opinion of or representa tions by an accountant or firm of
accountants in the employ of the Issuer, unless such officer or counsel, as the
case may be, knows that the certificate or opinion or representations with
respect to the accounting matters upon which his certificate, statement or
opinion may be based as aforesaid are erroneous, or in the exercise of
reasonable care should know that the same are erroneous.

         Any certificate or opinion of any independent firm of public
accountants or Investment Banker filed with the Trustee shall contain a
statement that such firm is independent.

         Section 10.6 Payments Due on Saturdays, Sundays and Holidays.

         If the date of maturity of interest on or principal, Change of Control
purchase price, or premium, if any, of the Securities or the date fixed for
redemption of any Security shall not be a Business Day, then payment of
interest, principal, Change of Control purchase price or premium need not be
made on such date, but may be made on the next succeeding Business Day with the
same force and effect as if made on the date of maturity or the date fixed for
redemption, and no interest shall accrue for the period after such date.

         Section 10.7 New York Law to Govern.

         THIS INDENTURE SHALL, PURSUANT TO SECTION 5-1401 OF THE NEW YORK
GENERAL OBLIGATIONS LAW BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK, WITHOUT
REFERENCE TO THE CHOICE OF LAW PROVISIONS THEREOF (OTHER THAN SUCH SECTION
5-1401).

         Section 10.8 Counterparts.



                                       47

<PAGE>   52



         This 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 agreement.

         Section 10.9 Effect of Headings.

         The Article and Section Headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.


                                   ARTICLE XI

                            REDEMPTION OF SECURITIES

         Section 11.1 Right of Optional Redemption Price.

         The Issuer at its option may, at any time, redeem the Securities, in
whole or in part, upon payment of a redemption price equal to the greater of (i)
the principal amount of the Securities to be redeemed plus accrued and unpaid
interest thereon, if any, to the date of redemption, or (ii) the Make Whole
Amount plus accrued and unpaid interest, if any, from the last payment date to
the redemption date.

         Section 11.2 Notice of Redemption.

         Notice of redemption to the Holders of Securities to be redeemed shall
be given by the Issuer by mailing notice of such redemption by first class mail,
postage prepaid, at least 30 days and not more than 60 days prior to the date
fixed for redemption to such Holders of Securities at their last addresses as
they shall appear in the Securities Register. Failure to give notice by mail, or
any defect in the notice to the Holder of any Security designated for redemp
tion as a whole or in part shall not affect the validity of the proceedings for
the redemption of any other Security.

         The notice of redemption to each Holder shall specify that the
Securities are being redeemed pursuant to this Article 11, the date fixed for
redemption, the place or places of payment, the CUSIP and ISIN numbers (as
applicable), that payment will be made upon presentation and surrender of the
Securities, that interest accrued to the date fixed for redemption will be paid
as specified in this Article and that, on and after said date interest thereon
or on the portions thereof to be redeemed will cease to accrue.

         The notice of redemption of Securities to be redeemed at the option of
the Issuer shall be given by the Issuer or, at the Issuer's request, by the
Trustee in the name and at the expense of the Issuer.



                                       48

<PAGE>   53



         At least one Business Day prior to the redemption date specified in the
notice of redemption given as provided in this Section 11.2, the Issuer shall
deposit with the Trustee or with one or more paying agents (or, if the Issuer is
acting as its own paying agent, set aside, segregate and hold in trust as
provided in Section 3.4 hereof) an amount of money sufficient to redeem on the
redemption date all the Securities so called for redemption.

         Section 11.3 Payment of Securities Called for Redemption.

         If notice of redemption has been given as above provided, the
Securities shall become due and payable on the date and at the place stated in
such notice at the redemption price, and on and after said date (unless the
Issuer shall default in the payment of such Securities at the redemption price)
interest on the Securities or portions of Securities so called for redemp tion
shall cease to accrue and, except as provided in Section 5.5 and Section 9.4
hereof, such Securities shall cease from and after the date fixed for redemption
to be entitled to any benefit or security under this Indenture, and the Holders
thereof shall have no right in respect of such Securities except the right to
receive the redemption price thereof. On presentation and surrender of such
Securities at a place of payment specified in said notice, said Securities shall
be paid and redeemed by the Issuer at the redemption price; provided, that any
semiannual payment of interest becoming due on the date fixed for redemption
shall be payable to the Holders of such Securities registered as such on the
relevant record date subject to the terms and provisions of Section 2.4 hereof.

         If any Security called for redemption shall not be so paid, upon
surrender thereof for redemption, the principal shall, until paid or duly
provided for, bear interest from the date fixed for redemption at the rate borne
by the Security.



                                       49

<PAGE>   54



         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed and their respective corporate seals to be hereunto affixed and
attested, all as of May 25, 1999.

                                     NRG ENERGY, INC., as Issuer



                                     By:
                                        ----------------------------------------
                                          Name:    Brian B. Bird
                                          Title:   Treasurer


Attest:


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


                                     NORWEST BANK MINNESOTA, NATIONAL
                                     ASSOCIATION, as Trustee



                                     By:
                                         ---------------------------------------
                                         Name:    Timothy Mowdy
                                         Title:   Corporate Trust Officer


Attest:



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




                                       50

<PAGE>   55



                                    EXHIBIT A

                                FORM OF SECURITY

         UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESEN TATIVE
OF THE DEPOSITORY TRUST COMPANY, TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF
TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN EXCHANGE FOR THIS
CERTIFICATE OR ANY PORTION HEREOF IS REGISTERED IN THE NAME OF CEDE & CO. OR IN
SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY OR SUCH OTHER REPRESENTA TIVE OF THE DEPOSITORY TRUST
COMPANY OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY TRUST COMPANY (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO.), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
OTHER THAN THE DEPOSI TORY TRUST COMPANY OR CEDE & CO. IS WRONGFUL INASMUCH AS
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

         TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN
WHOLE, BUT NOT IN PART, TO NOMINEES OF THE DEPOSITORY TRUST COMPANY OR TO A
SUCCESSOR THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF PORTIONS OF THIS
GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE
RESTRICTIONS SET FORTH IN SECTION 2.6 OF THE INDENTURE REFERRED TO ON THE
REVERSE HEREOF.















                                       A-1

<PAGE>   56



                                                                 CUSIP 629377AE2

No. [  ]

                                   $[    ]
                                NRG ENERGY, INC.
                          7-1/2% Senior Notes Due 2009

         NRG Energy, Inc. (the "Issuer"), for value received hereby promises to
pay to Cede & Co. or registered assigns the principal sum of [ ] Dollars at the
Issuer's office or agency for said purpose initially at the Corporate Trust
Office of Norwest Bank Minnesota, National Association (herein called the
"Trustee") at Corporate Trust, Norwest Center, Sixth and Marquette, Minneapolis,
Minnesota 55479-0069 and at the office or agency of the Issuer for said purpose
in the Borough of Manhattan, The City of New York, on June 1, 2009 in such coin
or currency of the United States of America as at the time of payment shall be
legal tender for the payment of public and private debts, and to pay interest,
semi-annually in arrears on June 1 and December 1 of each year, commencing
December 1, 1999, on said principal sum in like coin or currency at the rate per
annum set forth above at said offices or agencies from the most recent interest
payment date to which interest on the Securities has been paid or duly provided
for, unless the date hereof is a date to which interest on the Securities has
been paid or duly provided for, in which case from the date of this Security, or
unless no interest has been paid or duly provided for on the Securities, in
which case from May 25, 1999, until payment of said principal sum has been made
or duly provided for. Notwithstanding the foregoing, if the date hereof is after
June 1 or December 1, as the case may be, and before the following May 15 or
November 15, this Security shall bear interest from such June 1 or December 1;
provided, that if the Issuer shall default in the payment of interest due on
such June 1 or December 1, then this Security shall bear interest from the
immediately preceding June 1 or December 1 to which interest on the Securities
has been paid or duly provided for, or, if no interest has been paid or duly
provided for on the Securities, from May 25, 1999.

         The interest so payable on any June 1 or December 1 will, except as
otherwise provided in the Indenture referred to on the reverse hereof, be paid
to the Person in whose name this Security is registered at the close of business
on the Fifteenth day of May or the Fifteenth day of November preceding such June
1 or December 1, whether or not such day is a Business Day; provided, that
principal, premium, if any, and interest shall be paid by mailing a check for
such to or upon the written order of the registered Holders of Securities
entitled thereto at their last address as it appears on the Securities Register
or, upon written application to the Trustee by a Holder of $1,000,000 or more in
aggregate principal amount of Securities, by wire transfer of immediately
available funds to an account maintained by such Holder with a bank or other
financial institution. Interest on this Security shall be computed on the basis
of a 360-day year of twelve 30-day months.

         Interest on overdue principal and (to the extent permitted by
applicable law) on overdue installments of interest (including without
limitation during the 30-day period referred to in Section 4.1(b)) shall accrue
at the rate per annum set forth above.

         Reference is made to the further provisions set forth on the reverse
hereof. Such further provisions shall for all purposes have the same effect as
though fully set forth at this place.



                                       A-2

<PAGE>   57



         This Security shall not be entitled to any benefit under the Indenture,
or be valid or obligatory, until the certificate of authentication hereof shall
have been duly signed by the Trustee acting under the Indenture.

         IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed under its corporate seal.

                                NRG ENERGY, INC.

[Seal]

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

                                        By:
                                           --------------------------------
                                            Name:
                                            Title:
ATTEST:


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


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

Dated:

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

                                           NORWEST BANK MINNESOTA,
                                           NATIONAL ASSOCIATION, as Trustee

                                           ----------------------------------
                                                    Authorized Signatory





                                       A-3

<PAGE>   58



                               REVERSE OF SECURITY

                                NRG ENERGY, INC.

                          7-1/2% Senior Notes Due 2009

         This Security is one of a duly authorized issue of debt securities of
the Issuer, limited to the aggregate principal amount of $[ ] (except as
otherwise provided in the Indenture mentioned below), issued or to be issued
pursuant to an Indenture dated as of May 25, 1999 (the "Indenture"), duly
executed and delivered by the Issuer to the Trustee. Reference is hereby made to
the Indenture and all indentures supplemental thereto for a description of the
rights, limitations of rights, obligations, duties and immunities thereunder of
the Trustee, the Issuer and the Holders (the words "Holders" or "Holder" meaning
the registered holders or registered holder) of the Securities. Capitalized
terms used herein, but not otherwise defined herein, shall have the meanings
assigned to them in the Indenture.

         In case an Event of Default shall have occurred and be continuing, the
principal of all the Securities may be declared due and payable, in the manner
and with the effect, and subject to the conditions, provided in the Indenture.
The Indenture provides that in certain events such declaration and its
consequences may be waived by the Holders of a majority in aggregate principal
amount of the Securities then Outstanding and that, prior to any such
declaration, such Holders may waive any past default under the Indenture and its
consequences except a default in the payment of principal of or premium, if any,
or interest on any of the Securities. Any such consent or waiver by the Holder
of this Security (unless revoked as provided in the Indenture) shall be
conclusive and binding upon such Holder and upon all future Holders and owners
of this Security and any Security which may be issued in exchange or
substitution hereof, whether or not any notation thereof is made upon this
Security or such other Securities.

         The Indenture permits the Issuer and the Trustee, with the consent of
the Holders of not less than a majority in aggregate principal amount of the
Securities at the time Outstanding, evidenced as in the Indenture provided, to
modify the Indenture or any supplemental indentures or the rights of the Holders
of the Securities; provided that no such modification shall (a) change the
Stated Maturity of the principal of, or any installment of principal of or
interest on, any Security, or reduce the principal amount thereof, or reduce the
rate or extend the time of payment of interest thereon, or reduce any amount
payable on the redemption thereof or impair or affect the rights of any
Securityholder to institute suit for the payment thereof or make any change in
Section 3.9 of the Indenture (which relates to the obligation of the Issuer to
offer to purchase the Securities upon a Change of Control, as described below)
which adversely affects the rights of the Holders of the Securities without the
consent of the Holder of each Security so affected; (b) reduce the aforesaid
percentage of Securities, the consent of the Holders of which is required for
any such modification or the percentage of Securities, the consent of Holders of
which is required for any waiver provided for in the Indenture; (c) change any
obligation of the Issuer to maintain an office or agency for payment of and
transfer and exchange of the Securities; or (d) make certain changes to
provisions relating to waiver or to the provision for supplementing the
Indenture; in each case without consent of the Holders of all Securities then
Outstanding.

         No reference herein to the Indenture and no provision of this Security
or of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal






                                       A-4

<PAGE>   59



of and premium, if any, and interest on this Security at the place, times, and
rate, and in the currency, herein prescribed.

         The Securities are issuable only as registered Securities without
coupons in denominations of $100,000 and any integral multiple of $1,000 in
excess thereof.

         At the office or agency of the Issuer referred to on the face hereof
and in the manner subject to the limitations provided in the Indenture,
Securities may be presented for exchange for a like aggregate principal amount
of Securities of other authorized denominations.

         Upon due presentment for registration of transfer of this Security at
the above-mentioned office or agency of the Issuer, a new Security or Securities
of authorized denominations, for a like aggregate principal amount, will be
issued to the transferee as provided in the Indenture. No service charge shall
be made for any such transfer, but the Issuer may require payment of a sum
sufficient to cover any tax or other governmental charge that may be imposed in
relation thereto.

         The Securities may be redeemed in whole or in part (if in part, by lot
or by such other method as the Trustee shall deem fair or appropriate) prior to
Stated Maturity at the option of the Issuer, on any date, upon mailing a notice
of such redemption not less than 30 nor more than 60 days prior to the date
fixed for redemption to the Holders of Securities, all as provided in the
Indenture, at a redemption price equal to the greater of (i) the principal
amount thereof plus accrued and unpaid interest thereon, if any, to the date of
redemption, or (ii) the Make Whole Amount plus accrued and unpaid interest, if
any, from the last payment date to the redemption date. The Make Whole Amount
shall be computed by an independent investment banking institution of national
standing selected by the Issuer and shall equal the sum of the present values of
the Remaining Sceduled Payments discounted, on a semiannual basis (assuming a
360 day year consisting of twelve 30-day months), at a rate equal to the
Treasury Rate plus 25 basis points.

         In the event of a Change of Control (as defined in the Indenture), the
Issuer has the obligation, subject to certain conditions, to offer to purchase
the Securities at 101% of the principal amount thereof plus accrued interest to
the date of purchase in accordance with the procedures set forth in the
Indenture. As further described in the Indenture, a Change of Control will not
be deemed to have occurred if, after giving effect thereto, the Securities are
rated Investment Grade (as defined in the Indenture).

         Subject to payment by the Issuer of a sum sufficient to pay the amount
due on redemption, interest on this Security shall cease to accrue upon the date
duly fixed for redemption of this Security.

         The Issuer, the Trustee, and any authorized agent of the Issuer or the
Trustee, may deem and treat the registered Holder hereof as the absolute owner
of this Security (whether or not this Security shall be overdue and
notwithstanding any notation of ownership or other writing hereon made by anyone
other than the Issuer or the Trustee or any authorized agent of the Issuer or
the Trustee), for the purpose of receiving payment of, or on account of, the
principal hereof and premium, if any, and, subject to the provisions on the face
hereof, interest hereon and for all other purposes, and neither the Issuer nor
the Trustee nor any authorized agent of the Issuer or the Trustee shall be
affected by any notice to the contrary.



                                       A-5

<PAGE>   60



         No recourse shall be had for the payment of the principal of, or
premium, if any, of the interest on this Security, for any claim based hereon,
or otherwise in respect hereof, or based on or in respect of the Indenture or
any indenture supplemental thereto, against any incorporator, shareholder,
officer or director, as such, past, present or future, of the Issuer or of any
successor corporation, either directly or through the Issuer or any 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 issue
hereof, expressly waived and released.


























                                       A-6

<PAGE>   61


                               FORM OF ASSIGNMENT

I or we assign and transfer this Security to:

    (Insert assignee's social security or tax I.D. number)


(Print or type name, address and zip code of assignee)

and irrevocably appoint:


Agent to transfer this Security on the books of the Issuer. The Agent
may substitute another to act for him.

Date:  May ___, 1999                    Your Signature:

                                        (Sign exactly as your name appears
                                        exactly on the other side of this
                                        Security)

                              *Signature Guarantee:

                              *Signatures must be guaranteed by an "eligible
                  guarantor institution" meeting the requirements of the
                  Registrar, which requirements include membership or
                  participation in STAMP or such other "signature guarantee
                  program" as may be determined by the Registrar in addition to,
                  or in substitution for, STAMP, all in accordance with the
                  Securities Exchange Act of 1934.


                   FORM OF OPTION OF HOLDER TO ELECT PURCHASE

         If you wish to have this Security purchased by the Issuer pursuant to
Section 3.9 of the Indenture, check the Box: [insert #].

         If you wish to have a portion of this Security purchased by the Issuer
pursuant to Section 3.9 of the Indenture, state the amount (in original
principal amount):

                                            $-----------

Date:                                       Your Signature:

                                            (Sign exactly as your name appears
                                            exactly on the other side of this
                                            Security)

Signature Guarantee:

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


                                       A-7


<PAGE>   1
                                                                EXHIBIT  12.1



NRG ENERGY, INC.
Earnings to Fixed Charges
March 31, 1999 and March 31, 1998
<TABLE>
<CAPTION>

                                                            3/31/98    3/31/99
                                                            -------    --------
<S>                                                         <C>       <C>
EARNINGS:
    Income before taxes                                     (2,317)   (12,934)
    Less: Undistributed equity in earnings of              (12,541)     2,427
unconsolidated affiliates
    Add: Cash distribution from project termination              -          -
    Add: Fixed charges                                      11,872     11,462
                                                            ------     ------
                                                            (2,987)       955
                                                            ======     ======

FIXED CHARGES:
    Interest expense                                        11,453     11,059
    Interest capitalized                                        32         32
    Amortization of debt costs                                 259        235
    Approximation of interest in rental expense                128        136
                                                            ------     ------
                                                            11,872     11,462
                                                            ======     ======

RATIO OF EARNINGS TO FIXED CHARGES:                          -0.25       0.08
                                                            ======     ======

         Rent Expense                                      425,000    451,750

</TABLE>






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