EXHIBIT 4.2.1





                               THE AES CORPORATION

                                       and

                       THE FIRST NATIONAL BANK OF CHICAGO
                                   as Trustee

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

                          SECOND SUPPLEMENTAL INDENTURE

                          Dated as of October 13, 1997

              (Supplemental to Indenture Dated as of July 1, 1996)

                   10 1/4% Senior Subordinated Notes Due 2006








     SECOND SUPPLEMENTAL  INDENTURE dated as of October 13, 1997 between The AES
Corporation,  a Delaware corporation  (hereinafter called the "COMPANY") and The
First  National  Bank of Chicago,  a national  banking  association,  as Trustee
(hereinafter called the "TRUSTEE").

     WHEREAS,  the Company  executed and delivered an Indenture dated as of July
1,  1996,  as may be  amended or  supplemented  from time to time,  (hereinafter
called the "ORIGINAL  INDENTURE")  between the Company and the Trustee providing
for the issue  from  time to time of its  unsecured  debentures,  notes or other
evidences  of  indebtedness  in one  or  more  series  (hereinafter  called  the
"SECURITIES"); and

     WHEREAS, the Company executed and delivered a First Supplemental  Indenture
(the "FIRST  SUPPLEMENTAL  INDENTURE"),  supplemental to the Original Indenture,
between the Company and the Trustee  providing for the issuance of  $250,000,000
aggregate  principal amount of the Company's 10 1/4% Senior  Subordinated  Notes
due 2006 (the "10 1/4% NOTES"); and

     WHEREAS,  Section 9.2 of the Original  Indenture provides that the Original
Indenture  may be amended by the Company and the Trustee with the consent of the
holders of not less than a majority in aggregate principal amount of the 10 1/4%
Notes; and

     WHEREAS,  holders of not less than a majority in aggregate principal amount
of the 10 1/4% Notes  outstanding  on August 19, 1997 have given and not revoked
their  consent to the  execution  by the Company and the Trustee of an amendment
changing the  provisions  of, and modifying the rights of holders of the 10 1/4%
Notes under, the Original Indenture, as amended or supplemented, as set forth in
this Second Supplemental Indenture; and

     WHEREAS,  all  conditions  and  requirements  necessary to make this Second
Supplemental  Indenture a valid and binding  instrument in  accordance  with its
terms and the terms of the Original Indenture have been satisfied.

     NOW,  THEREFORE,  in  consideration  of the  premises  and  of  the  mutual
covenants  herein  contained,  the Company and the Trustee  hereby  covenant and
agree as follows:

     SECTION 1.  Defined  Terms.  For all  purposes of this Second  Supplemental
Indenture,  except  as  otherwise  expressly  provided  or  unless  the  context
otherwise  requires,  all  capitalized  terms defined  herein and defined in the
Original  Indenture  or First  Supplemental  Indenture  shall have the  meanings
assigned to them herein.







Unless otherwise expressly specified, all references to a "SECTION" herein refer
to a section of the Second Supplemental Indenture.

     SECTION  2.  Amendment  of  Section  1.1 of First  Supplemental  Indenture.
Section 1.1 of the First Supplemental Indenture is hereby amended to read in its
entirety as follows:

          "SECTION 1.1. The words  "herein",  "hereof" and "hereunder" and other
words of similar  import refer to this First  Supplemental  Indenture as a whole
and not to any  particular  Section or other  subdivision.  The following  terms
shall,  unless the context otherwise clearly requires,  for all purposes of this
First  Supplemental  Indenture  have the respective  meanings  specified in this
Section:

          "ACQUISITION  DEBT" means Debt of any Person existing at the time such
     Person  became a  Restricted  Subsidiary  of the Company (or such Person is
     merged into the Company or one of its Restricted  Subsidiaries)  or assumed
     in connection  with the  acquisition  of assets from any such Person (other
     than assets  acquired in the ordinary  course of business),  including Debt
     Incurred in connection with, or in contemplation of, such Person becoming a
     Restricted  Subsidiary  of the Company (but  excluding  Debt of such Person
     which is  extinguished,  retired or repaid in  connection  with such Person
     becoming a Restricted Subsidiary of the Company).

          "ADJUSTED  CONSOLIDATED  NET INCOME"  means,  for any period,  for any
     Person  the  aggregate  Net  Income  (or  loss)  of  such  Person  and  its
     Consolidated  Subsidiaries  for such period  determined in conformity  with
     GAAP plus the Net Income of any  Restricted  Subsidiary  of such Person for
     prior  periods to the extent  such Net Income is  actually  paid in cash to
     such Person  during  such  period plus the Net Income of any Person  (other
     than a  Restricted  Subsidiary)  in which such Person has a joint  interest
     with a third  party for prior  periods  to the  extent  such Net  Income is
     actually paid in cash to such Person during such period;  provided that the
     following items shall be excluded in computing  Adjusted  Consolidated  Net
     Income  (without  duplication):  (i) the Net Income (or loss) of any Person
     (other  than a  Restricted  Subsidiary)  in which  such  Person has a joint
     interest  with a third  party,  except  to the  extent  such Net  Income is
     actually  paid in cash to such Person  during such period;  (ii) solely for
     the purposes of calculating  the amount of Restricted  Payments that may be
     made pursuant to clauses (c)(1) or (c)(2) of Section 3.8 (and in such case,
     except to the extent  includible  pursuant  to clause (i)  above),  the Net
     Income (if positive) of such Person  accrued prior to the date it becomes a
     Restricted Subsidiary of any other Person or is merged into or consolidated
     with such other Person or any of its Restricted Subsidiaries or


                                       2





     all or  substantially  all of the  property  and assets of such  Person are
     acquired by such other Person or any of its Restricted Subsidiaries;  (iii)
     the Net  Income  (or loss) of any  Restricted  Subsidiary  of such  Person,
     except to the extent such Net Income (if positive) is actually paid in cash
     to such  Person  during  such  period;  (iv)  any  gains or  losses  (on an
     after-tax basis)  attributable to Asset Sales; (v) the cumulative effect of
     a change in accounting  principle;  and (vi) any amounts paid or accrued as
     dividends  on  Preferred  Stock of such  Person or  Preferred  Stock of any
     Restricted Subsidiary of such Person.

          "AES  HAWAII"  means AES  Hawaii  Management  Co.,  Inc.,  a  Delaware
     corporation and a Subsidiary of the Company, and its successors.

          "AES  OKLAHOMA"  means AES Oklahoma  Management  Co., Inc., a Delaware
     corporation and a Subsidiary of the Company, and its successors.

          "AFFILIATE" means, as applied to any Person, any other Person directly
     or  indirectly  controlling  or  controlled  by or under direct or indirect
     common  control  with such  Person.  For the  purposes of this  definition,
     "CONTROL" (including,  with correlative meanings,  the terms "CONTROLLING",
     "CONTROLLED  BY" and "UNDER COMMON CONTROL WITH") when used with respect to
     any Person is defined to mean the  possession,  directly or indirectly,  of
     the power to direct or cause the direction of the  management  and policies
     of such Person,  whether  through the  ownership of voting  securities,  by
     contract or otherwise.

          "ASSET  ACQUISITION"  means (i) an investment by the Company or any of
     its  Restricted  Subsidiaries  in any other  Person  pursuant to which such
     Person shall become a  Restricted  Subsidiary  of the Company or any of its
     Restricted  Subsidiaries or shall be merged into or  consolidated  with the
     Company or any of its Restricted Subsidiaries or (ii) an acquisition by the
     Company or any of its Restricted Subsidiaries of the Property of any Person
     other  than  the  Company  or  any  of  its  Restricted  Subsidiaries  that
     constitutes  substantially  all of an  operating  unit or  business of such
     Person.

          "ASSET  DISPOSITION"  means,  with  respect to any  Person,  any sale,
     transfer,  conveyance,  lease or  other  disposition  (including  by way of
     merger,  consolidation  or  sale-leaseback)  by such  Person  or any of its
     Restricted  Subsidiaries  to any  Person  (other  than to such  Person or a
     Consolidated Subsidiary of such Person and other than in the ordinary


                                       3





     course of business) of (i) any assets (excluding cash and cash equivalents)
     of such Person or any of its Restricted  Subsidiaries or (ii) any shares of
     Capital Stock of such  Person's  Restricted  Subsidiaries.  For purposes of
     this definition,  any disposition in connection with directors'  qualifying
     shares or investments by foreign nationals mandated by applicable law shall
     not  constitute  an  Asset  Disposition.   In  addition,  the  term  "ASSET
     DISPOSITION"  shall not include any sale,  transfer,  conveyance,  lease or
     other  disposition  of assets  governed  by Section  5.1.  The term  "ASSET
     DISPOSITION"  also shall not  include  (i) any sale of shares of  Preferred
     Stock of a Restricted Subsidiary,  (ii) the grant of a security interest by
     any Person in any assets or shares of Capital  Stock  securing a  borrowing
     by, or contractual performance obligation of, such Person or any Restricted
     Subsidiary of such Person,  (iii) a  sale-leaseback  transaction  involving
     substantially  all of  the  assets  of a  Power  Supply  Business  where  a
     Restricted  Subsidiary of the Company sells the Power Supply  Business to a
     Person in exchange for the  assumption by that Person of the Debt financing
     the Power Supply  Business and the Restricted  Subsidiary  leases the Power
     Supply Business from such Person,  (iv)  dispositions  of contract  rights,
     development  rights and resource data made in  connection  with the initial
     development of a Power Supply  Business,  made prior to the commencement of
     commercial operation of such Power Supply Business or (v) transactions made
     in order to enhance the  repatriation of cash proceeds in connection with a
     Foreign Asset  Disposition  or in order to increase the after-tax  proceeds
     thereof available for immediate distribution.

          "ASSET SALE" means the sale or other disposition by the Company or any
     of its  Restricted  Subsidiaries  (other  than to the  Company  or  another
     Restricted  Subsidiary of the Company) of (i) all or  substantially  all of
     the Capital Stock of any  Restricted  Subsidiary of the Company or (ii) all
     or substantially  all of the Property that constitutes an operating unit or
     business of the Company or any of its Restricted Subsidiaries.

          "AVERAGE LIFE" means, at any date of determination with respect to any
     debt security, the quotient obtained by dividing (i) the sum of the product
     of (A) the number of years from such date of  determination to the dates of
     each  successive   scheduled   principal  payment  of  such  debt  security
     multiplied by (B) the amount of such  principal  payment by (ii) the sum of
     all such principal payments.

          "BANK AGENT" means Morgan Guaranty Trust Company of New York, as agent
     for the Banks pursuant to the Bank Credit  Agreement,  and any successor or
     successors thereto in such capacity.


                                       4





          "BANK CREDIT  AGREEMENT" means the Credit Agreement dated as of August
     2, 1996 among the Company,  the Banks named on the signature  pages thereof
     and the  Bank  Agent,  as  such  agreement  has  been  and may be  amended,
     restated,  supplemented  or  otherwise  modified  from  time to  time,  and
     includes  any  agreement   extending  the  maturity  of,  or  restructuring
     (including,  but not  limited to, the  inclusion  of  additional  borrowers
     thereunder  that are  Restricted  Subsidiaries  of the  Company  and  whose
     obligations  are guaranteed by the Company  thereunder)  all or any portion
     of, the Debt under such agreement or any successor  agreements and includes
     any  agreement  with  one or  more  banks  or  other  lending  institutions
     refinancing  all or any  portion of the Debt under  such  agreement  or any
     successor agreements.

          "BANKS"  means the  lenders  who are from time to time  parties to the
     Bank Credit Agreement.

          "BOARD  OF  DIRECTORS"  means  either  the Board of  Directors  of the
     Company or (except for the  purposes of clause (iii) of the  definition  of
     "Change of Control")  any  committee of such Board duly  authorized  to act
     hereunder.

          "BOARD  RESOLUTION"  means  one or more  resolutions  of the  Board of
     Directors,  certified by the  secretary  or an assistant  secretary to have
     been  duly  adopted  and to be in full  force  and  effect  on the  date of
     certification, and delivered to the Trustee.

          "BUSINESS DAY" means any day, other than a Saturday or Sunday, that is
     neither  a  legal  holiday  nor a day on  which  banking  institutions  are
     authorized  or  required by law or  regulation  to close in The City of New
     York.

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

          "CAPITALIZED  LEASE" means, as applied to any Person, any lease of any
     Property of which the discounted present value of the rental obligations of
     such  Person  as  lessee,  in  conformity  with  GAAP,  is  required  to be
     capitalized on the balance sheet of such Person; and "Capitalized


                                       5





     Lease Obligation" is defined to mean the rental obligations,  as aforesaid,
     under such lease.

          "CHANGE  OF  CONTROL"  means  the  occurrence  of one or  more  of the
     following events:  (i) any sale, lease,  exchange or other transfer (in one
     transaction or a series of related  transactions)  of all, or substantially
     all,  of the assets of the  Company to any Person or group (as that term is
     used in Section 13(d)(3) of the Exchange Act) of Persons,  (ii) a Person or
     group (as so defined) of Persons  (other than  management of the Company on
     the date of the Original  Indenture or their  Affiliates) shall have become
     the beneficial  owner of more than 35% of the  outstanding  Voting Stock of
     the Company,  or (iii) during any one-year  period,  individuals who at the
     beginning of such period  constitute the Board of Directors  (together with
     any new director 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)  cease to  constitute  a
     majority of the Board of Directors.

          "CHANGE OF CONTROL OFFER" has the meaning provided in Section 3.6.

          "CLOSING  DATE" means July 17, 1997,  the date on which the  Company's
     83/8% Senior  Subordinated  Notes due 2007 were originally issued under the
     indenture relating to such notes.

          "COMMON STOCK" means, with respect to any Person,  any and all shares,
     interests, participations or other equivalents (however designated, whether
     voting or  non-voting)  of common stock of such Person which is outstanding
     or issued on or after the Closing Date, including,  without limitation, all
     series and classes of such common stock.

          "CONSOLIDATED  EBITDA" of any Person for any period means the Adjusted
     Consolidated  Net Income of such Person,  plus  (without  duplication)  (i)
     income  taxes  (other than income  taxes (x) (either  positive or negative)
     attributable to extraordinary  and  non-recurring  gains or losses or Asset
     Sales and (y) actually payable with respect to such period) determined on a
     consolidated  basis for such Person and its  Consolidated  Subsidiaries  in
     accordance   with  GAAP  to  the  extent  payable  by  such  Person,   (ii)
     Consolidated Fixed Charges, (iii) depreciation and amortization expense for
     such period and prior periods,  all determined on a consolidated  basis for
     such Person and its Consolidated  Subsidiaries in accordance with GAAP, but
     only to the  extent  that the  positive  cash  flow  associated  with  such
     depreciation and amortization expense is actually


                                       6





     received  in cash by such  Person  during  such  period  and (iv) all other
     non-cash items  reducing Net Income for such period and prior periods,  all
     determined  on a  consolidated  basis for such Person and its  Consolidated
     Subsidiaries  in  accordance  with GAAP,  but only to the  extent  that the
     positive cash flow associated with such non-cash items is actually received
     in cash by such Person during such period,  and less (without  duplication)
     (i) all non-cash  items  increasing  Net Income of such Person  during such
     period and prior  periods,  but only to the extent that  positive cash flow
     associated  with such  non-cash  items in not actually  received in cash by
     such  Person  during  such  period,  and (ii) the  aggregate  amount of any
     capitalized expenses (including  capitalized  interest) paid by such Person
     during such period which have the effect of increasing  Net Income for such
     period.

          "CONSOLIDATED  FIXED CHARGES" of any Person means, for any period, the
     aggregate of (i) Consolidated Interest Expense, (ii) the interest component
     of Capitalized  Leases,  determined on a consolidated basis for such Person
     and its  Consolidated  Subsidiaries in accordance with GAAP,  excluding any
     interest  component of  Capitalized  Leases in respect of that portion of a
     Capitalized   Lease   Obligation  of  a  Restricted   Subsidiary   that  is
     Non-Recourse  to such  Person and (iii)  cash and  non-cash  dividends  due
     (whether or not declared) on any Redeemable Stock of such Person.

          "CONSOLIDATED  INTEREST  EXPENSE" of any Person means, for any period,
     the aggregate  interest expense in respect of Debt (including  amortization
     of original issue discount and non-cash  interest  payments or accruals) of
     such Person and its Consolidated Subsidiaries, determined on a consolidated
     basis in accordance with GAAP, including all commissions,  discounts, other
     fees and  charges  owed with  respect to  letters  of credit  and  bankers'
     acceptance financing and net costs associated with Interest Rate Agreements
     and any  amounts  paid  during  such  period in  respect  of such  interest
     expense,  commissions,  discounts,  other fees and  charges  that have been
     capitalized;  provided that  Consolidated  Interest  Expense of the Company
     shall  not  include  any  interest  expense   (including  all  commissions,
     discounts,  other fees and charges  owed with  respect to letters of credit
     and bankers'  acceptance  financing and net costs  associated with Interest
     Rate  Agreements)  in  respect  of that  portion  of  Debt of a  Restricted
     Subsidiary of the Company that is Non-Recourse to the Company; and provided
     further that  Consolidated  Interest Expense of the Company in respect of a
     Guarantee by the Company of Debt of a Restricted  Subsidiary shall be equal
     to the  commissions,  discounts,  other fees and charges  that would be due
     with  respect  to a  hypothetical  letter of credit  issued  under the Bank
     Credit Agreement that can be drawn by the


                                       7





     beneficiary  thereof  in the  amount of the Debt so  guaranteed  if (i) the
     Company is not actually making directly or indirectly  interest payments on
     such Debt and (ii) GAAP does not require  the Company on an  unconsolidated
     basis to record such Debt as a liability of the Company.

          "CONSOLIDATED  SUBSIDIARY"  means  at any  date  with  respect  to any
     Person, any Subsidiary of such Person or other entity the accounts of which
     would  be  consolidated  with  those  of such  Person  in its  consolidated
     financial  statements  if such  statements  were  prepared as of such date,
     other than an Unrestricted Subsidiary.

          "CONSOLIDATED  TOTAL ASSETS" means,  with respect to any Person at any
     time, the total assets of such Person and its Consolidated  Subsidiaries at
     such time determined in conformity with GAAP.

          "CURRENCY  AGREEMENT" means,  with respect to any Person,  any foreign
     exchange  contract,  currency swap agreement or other similar  agreement or
     arrangement  designed  to  protect  such  Person  or any of its  Restricted
     Subsidiaries against fluctuations in currency values to or under which such
     Person or any of its Restricted Subsidiaries is a party or a beneficiary on
     the Closing Date or becomes a party or a beneficiary thereafter.

          "DEBT" means,  with respect to any Person at any date of determination
     (without  duplication),  (i) all  indebtedness  of such Person for borrowed
     money, (ii) all obligations of such Person evidenced by bonds,  debentures,
     notes or other similar instruments, (iii) all obligations of such Person in
     respect  of  letters  of credit or  bankers'  acceptance  or other  similar
     instruments (or reimbursement  obligations with respect thereto),  (iv) all
     obligations  of such Person to pay the deferred  purchase price of property
     or services,  except Trade Payables,  (v) all obligations of such Person as
     lessee under Capitalized  Leases, (vi) all Debt of others secured by a Lien
     on any asset of such  Person,  whether  or not such Debt is assumed by such
     Person;  provided that, for purposes of determining  the amount of any Debt
     of the type described in this clause, if recourse with respect to such Debt
     is limited to such  asset,  the amount of such Debt shall be limited to the
     lesser of the fair  market  value of such asset or the amount of such Debt,
     (vii) all Debt of others  Guaranteed by such Person to the extent such Debt
     is Guaranteed  by such Person,  (viii) all  Redeemable  Stock valued at the
     greater of its voluntary or involuntary liquidation preference plus accrued
     and unpaid dividends and (ix) to the extent not otherwise  included in this
     definition,  all  obligations of such Person under Currency  Agreements and
     Interest Rate Agreements.


                                       8





          "DEFAULT" means any Event of Default as defined in Section 6.1 and any
     event  that is, or after  notice or  passage  of time or both  would be, an
     Event of Default.

          "DESIGNATED  SENIOR  DEBT"  means  (i)  Debt  under  the  Bank  Credit
     Agreement and (ii) Debt constituting  Senior Debt which, at the time of its
     determination,  (A) has an  aggregate  principal  amount  of at  least  $30
     million and (B) is  specifically  designated in the  instrument  evidencing
     such Senior Debt as "Designated Senior Debt" by the Company.

          "EVENT OF DEFAULT" has the meaning provided in Section 6.1.

          "EXCESS  CASH FLOW" of any Person  for any period  means  Consolidated
     EBITDA less Consolidated  Fixed Charges less any income taxes actually paid
     by such Person during such period.

          "FINANCE  SUBSIDIARY"  means a Wholly-Owned  Subsidiary of the Company
     that does not engage in any activity  other than (i) the holding of Debt of
     the Company that both (x) is subordinated to the Notes and (y) provides for
     no payments of principal by way of sinking  fund,  mandatory  redemption or
     otherwise prior to the maturity of the Notes,  (ii) the issuance of Capital
     Stock  and (iii) any  activity  necessary,  incidental  or  related  to the
     foregoing.

          "FIXED CHARGE RATIO" means the ratio, on a pro forma basis, of (i) the
     aggregate  amount of  Consolidated  EBITDA of any Person for the  Reference
     Period  immediately prior to the date of the transaction giving rise to the
     need to calculate the Fixed Charge Ratio (the  "Transaction  Date") to (ii)
     the  aggregate  Consolidated  Fixed  Charges  of such  Person  during  such
     Reference  Period;  provided  that for  purposes  of such  computation,  in
     calculating  Consolidated  EBITDA and Consolidated  Fixed Charges,  (1) the
     Incurrence  of the Debt  giving  rise to the need to  calculate  the  Fixed
     Charge Ratio and the application of the proceeds therefrom shall be assumed
     to have occurred on the first day of the Reference Period,  (2) Asset Sales
     and  Asset   Acquisitions  which  occur  during  the  Reference  Period  or
     subsequent to the Reference  Period and prior to the Transaction  Date (but
     including any Asset  Acquisition to be made with the Debt Incurred pursuant
     to clause (1) above) shall be assumed to have  occurred on the first day of
     the Reference  Period,  (3) the Incurrence of any Debt during the Reference
     Period or subsequent to the Reference  Period and prior to the  Transaction
     Date and the application of the proceeds therefrom shall be assumed to have
     occurred  on the  first  day of such  Reference  Period,  (4)  Consolidated
     Interest Expense attributable to


                                       9





     any Debt (whether existing or being Incurred) computed on a pro forma basis
     and  bearing a floating  interest  rate shall be computed as if the rate in
     effect  on the date of  computation  had been the  applicable  rate for the
     entire period unless such Person or any of its Restricted Subsidiaries is a
     party to an Interest Rate  Agreement  (which shall remain in effect for the
     twelve  month period  after the  Transaction  Date) which has the effect of
     fixing the  interest  rate on the date of  computation,  in which case such
     rate  (whether  higher  or  lower)  shall  be used and (5)  there  shall be
     excluded from  Consolidated  Fixed Charges any  Consolidated  Fixed Charges
     related to any amount of Debt which was  outstanding  during and subsequent
     to the Reference  Period but is not  outstanding on the  Transaction  Date,
     except for  Consolidated  Fixed Charges  actually  incurred with respect to
     Debt  borrowed (as  adjusted  pursuant to clause (4)) (x) under a revolving
     credit or  similar  arrangement  to the extent  the  commitment  thereunder
     remains in effect on the Transaction Date or (y) pursuant to clause (iv) of
     Section 3.3(b). For the purpose of making this computation, Asset Sales and
     Asset  Acquisitions  which have been made by any Person  which has become a
     Restricted  Subsidiary  of the  Company  or been  merged  with or into  the
     Company or any  Restricted  Subsidiary of the Company  during the Reference
     Period or subsequent to the Reference  Period and prior to the  Transaction
     Date  shall  be  calculated  on a pro  forma  basis  (including  all of the
     calculations  referred to in clauses (1)  through (5) above  assuming  such
     Asset  Sales  or  Asset  Acquisitions  occurred  on  the  first  day of the
     Reference Period).

          "FOREIGN ASSET  DISPOSITION" means any Asset Disposition in respect of
     the Capital  Stock  and/or  Property of any  Restricted  Subsidiary  of any
     Person where such Restricted  Subsidiary is organized under the laws of any
     jurisdiction  other than the U.S.  or any state  thereof or any  Restricted
     Subsidiary  of the type  described in Section 936 of the  Internal  Revenue
     Code of 1986,  as amended,  to the extent  that the  proceeds of such Asset
     Disposition are received by a Person subject in respect of such proceeds to
     the tax laws of a jurisdiction other than the U.S. or any state thereof.

          "GAAP" means generally accepted  accounting  principles in the U.S. as
     in effect as of the Closing  Date  applied on a basis  consistent  with the
     principles,  methods,  procedures and practices employed in the preparation
     of  the  Company'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


                                       10





     entity  as  is  approved  by  a  significant   segment  of  the  accounting
     profession.

          "GUARANTEE"  means any  obligation,  contingent or  otherwise,  of any
     Person directly or indirectly  guaranteeing any Debt or other obligation of
     any other Person and, without limiting the generality of the foregoing, any
     obligation, direct or indirect, contingent or otherwise, of such Person (i)
     to purchase or pay (or advance or supply  funds for the purchase or payment
     of) such Debt or other  obligation of such other Person (whether arising by
     virtue  of  partnership  arrangements,  or by  agreement  to  keepwell,  to
     purchase  assets,  goods,  securities or services,  to  take-or-pay,  or to
     maintain financial statement  conditions or otherwise) or (ii) entered into
     for  purposes of  assuring in any other  manner the obligee of such Debt or
     other  obligation of the payment thereof or to protect such obligee against
     loss in  respect  thereof  (in  whole or in part);  provided  that the term
     "Guarantee" shall not include endorsements for collection or deposit in the
     ordinary  course of  business.  The term  "Guarantee"  used as a verb has a
     corresponding meaning.

          "HOLDER",  "HOLDER OF SECURITIES",  "SECURITYHOLDER" and other similar
     terms mean the registered holder of any Security.

          "INCUR"  means,  with respect to any Debt,  to incur,  create,  issue,
     assume,  Guarantee  or otherwise  become  liable for or with respect to, or
     become  responsible  for, the payment of,  contingently or otherwise,  such
     Debt;  provided that neither the accrual of interest (whether such interest
     is payable in cash or kind) nor the  accretion of original  issue  discount
     shall be considered an Incurrence of Debt.

          "INDENTURE" means this Indenture as originally  executed and delivered
     or as it may be amended or  supplemented  from time to time pursuant to the
     terms hereof.

          "INDEPENDENT   FINANCIAL   ADVISOR"  means  a  nationally   recognized
     investment banking firm (i) which does not (and whose directors,  officers,
     employees  and  Affiliates  do not)  have a  direct  or  indirect  material
     financial  interest in the Company and (ii) which,  in the sole judgment of
     the Board of Directors,  is otherwise  independent and qualified to perform
     the task for which such firm is being engaged.

          "INTEREST PAYMENT DATE," when used with respect to any Security, means
     the  stated  maturity  of an  installment  of  interest  specified  in such
     Security.


                                       11





          "INTEREST  RATE  AGREEMENT"  means,  with  respect to any Person,  any
     interest  rate  protection  agreement,   interest  rate  future  agreement,
     interest rate option agreement, interest rate swap agreement, interest rate
     cap  agreement,   interest  rate  collar  agreement,  interest  rate  hedge
     agreement or other  similar  agreement or  arrangement  designed to protect
     such Person or any of its Restricted  Subsidiaries  against fluctuations in
     interest  rates to or under  which  such  Person  or any of its  Restricted
     Subsidiaries  is a party or a  beneficiary  on the date of the Indenture or
     becomes a party or a beneficiary thereafter.

          "INTERMEDIATE  HOLDING COMPANY" means any Restricted Subsidiary of the
     Company  that  serves  as a holding  company  for the  Company's  direct or
     indirect interests in Power Supply Businesses and Unrelated Businesses.

          "INVESTMENT"  in a Person means any investment in, loan or advance to,
     Guarantee on behalf of, directly or indirectly, or other transfer of assets
     to such Person. For purposes of the definition of "Unrestricted Subsidiary"
     and Section 3.8,  "Investment"  shall  include (i) the fair market value of
     the assets (net of  liabilities)  of any Restricted  Subsidiary at the time
     that such Restricted  Subsidiary is designated an  Unrestricted  Subsidiary
     and shall exclude the fair market value of the assets (net of  liabilities)
     of  any  Unrestricted   Subsidiary  at  the  time  that  such  Unrestricted
     Subsidiary  is  designated  a Restricted  Subsidiary  and (ii) any property
     transferred  to or from any Person shall be valued at its fair market value
     at the time of such  transfer,  in each case as  determined by the Board of
     Directors in good faith.

          "INVESTMENT  GRADE" means,  with respect to any security,  a rating of
     Baa3 or higher of such security by Moody's  Investors Service Inc. together
     with a rating of BBB- or  higher  of such  security  by  Standard  & Poor's
     Corporation.

          "JOINT  VENTURE" means a joint  venture,  partnership or other similar
     arrangement,  whether  in  corporate,  partnership  or  other  legal  form;
     provided  that,  as  to  any  such  arrangement  in  corporate  form,  such
     corporation  shall not,  as to any Person of which  such  corporation  is a
     Subsidiary,  be  considered to be a Joint Venture to which such Person is a
     party.

          "LEGAL HOLIDAY" means any day other than a Business Day.


                                       12





          "LIEN"  means,  with  respect to any  Property,  any  mortgage,  lien,
     pledge, charge,  security interest or encumbrance of any kind in respect of
     such Property. For purposes of this Indenture,  the Company shall be deemed
     to own  subject  to a Lien  any  Property  which it has  acquired  or holds
     subject to the  interest of a vendor or lessor under any  conditional  sale
     agreement,  capital lease or other title  retention  agreement  relating to
     such Property.

          "MATERIAL AES ENTITY" means (i) any Subsidiary Guarantor,  (ii) any of
     AES Connecticut  Management Co., Inc., AES Thames, Inc., AES Barbers Point,
     Inc.  and AES Shady  Point,  Inc.  and (iii) any other  Person in which the
     Company  has a  direct  or  indirect  equity  Investment  if such  Person's
     contribution  to  Consolidated  EBITDA  of the  Company  for the four  most
     recently  completed fiscal quarters of the Company  constitutes 15% or more
     of the  Consolidated  EBITDA of the Company for such period,  in each case,
     other than an Unrestricted Subsidiary.

          "MATERIAL  SUBSIDIARY"  of  a  Person  means,  as  of  any  date,  any
     Restricted  Subsidiary  that would  constitute a  "SIGNIFICANT  SUBSIDIARY"
     within the meaning of Article 1 of Regulation S-X.

          "MATURITY  DATE," when used with  respect to any Note,  means the date
     specified in such Note as the fixed date on which the final  installment of
     principal  of  such  Note  is  due  and  payable  (in  the  absence  of any
     acceleration  thereof pursuant to Section 6.2 of the Original  Indenture or
     any Change of Control Offer pursuant to Section 3.6).

          "NET CASH  PROCEEDS"  from an Asset  Disposition  means cash  payments
     received  (including any cash payments  received by way of deferred payment
     of principal pursuant to a note or installment receivable or otherwise, but
     only as and  when  received  (including  any  cash  received  upon  sale or
     disposition of such note or receivable),  excluding any other consideration
     received in the form of assumption by the acquiring Person of Debt or other
     obligations  relating to the Property disposed of in such Asset Disposition
     or received in any other noncash form) therefrom,  in each case, net of all
     legal,  title and recording tax  expenses,  commissions  and other fees and
     expenses incurred (including,  without limitation,  consent and waiver fees
     and any  applicable  premiums,  earn-out  or working  interest  payments or
     payments  in lieu or in  termination  thereof),  and  all  federal,  state,
     provincial,  foreign and local taxes  required to be accrued as a liability
     under GAAP (i) as a consequence of such Asset Disposition, (ii) as a result
     of  the  repayment  of  any  Debt  in  any  jurisdiction   other  than  the
     jurisdiction where the Property disposed of was


                                       13





     located  or (iii)  as a  result  of any  repatriation  to the  U.S.  of any
     proceeds of such Asset  Disposition,  and in each case net of a  reasonable
     reserve for the after tax-cost of any  indemnification  payments (fixed and
     contingent)   attributable   to  seller's   indemnities  to  the  purchaser
     undertaken  by  the  Company  or  any of  its  Restricted  Subsidiaries  in
     connection with such Asset  Disposition (but excluding any payments,  which
     by the terms of the indemnities will not, under any circumstances,  be made
     during the term of the  Notes),  and net of all  payments  made on any Debt
     which is secured by such Property, in accordance with the terms of any Lien
     upon or with  respect  to such  Property  or which  must by its terms or by
     applicable  law be repaid out of the proceeds from such Asset  Disposition,
     and net of all  distributions  and other payments made to minority interest
     holders in Restricted  Subsidiaries  or Joint  Ventures as a result of such
     Asset Disposition.

          "NET INCOME" of any Person for any period means the net income  (loss)
     of such Person for such period,  determined in accordance with GAAP, except
     that  extraordinary  and  non-recurring  gains and losses as  determined in
     accordance with GAAP shall be excluded.

          "NET WORTH" of any Person  means,  as of any date,  the  aggregate  of
     capital,   surplus  and  retained   earnings   (including   any  cumulative
     translation adjustment) of such Person and its Consolidated Subsidiaries as
     would be shown  on a  consolidated  balance  sheet of such  Person  and its
     Consolidated Subsidiaries prepared as of such date in accordance with GAAP.

          "NON-RECOURSE" to a Person as applied to any Debt (or portion thereof)
     means that such  Person is not  directly or  indirectly  liable to make any
     payments with respect to such Debt (or portion thereof),  that no Guarantee
     of such Debt (or  portion  thereof)  has been made by such  Person and that
     such Debt (or  portion  thereof)  is not  secured by a Lien on any asset of
     such Person.

          "PAYING  AGENT" means any Person  authorized by the Company to pay the
     principal of (and,  premium,  if any) or interest on the Notes on behalf of
     the Company.

          "PERMITTED  INVESTMENT"  means any Investment of the type specified in
     clauses (iv) or (vi) of the definition of Restricted  Payment which is made
     directly or  indirectly  by the Company  and its  Restricted  Subsidiaries;
     provided that (i) at the time such  Investment  is made,  the Company could
     Incur at least $1 of Debt under Section 3.3(a); (ii) at the


                                       14





     time such Investment is made, 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;  (iii) after giving  effect to the
     Investment,   the  aggregate  Investments  made  by  the  Company  and  its
     Restricted  Subsidiaries in the applicable  Person and in any other Persons
     that have a direct or indirect  interest in the same Power Supply  Business
     or Unrelated  Business  does not exceed 40% of the Net Worth of the Company
     as of the end of its most recently ended fiscal quarter; (iv) the Person in
     which the Investment is made is engaged only in the businesses described in
     Section  3.1;  and (v) the  Company  directly  or  through  its  Restricted
     Subsidiaries  either  (x)  controls,  under  an  operating  and  management
     agreement or  otherwise,  the day to day  management  and  operation of any
     Power  Supply  Business  or  Unrelated  Business of the Person in which the
     Investment is made or (y) has significant influence over the management and
     operation  of any such Power  Supply  Business  or  Unrelated  Business  in
     connection  with  such  management  or  operation.  To the  extent  that an
     Investment  is  not a  Permitted  Investment  only  because  the  aggregate
     investment  limitation  in  clause  (iii)  above  is  not  satisfied,  such
     Investment shall be treated as a Permitted  Investment to the extent of the
     limitation  and  any  excess  Investment  shall  be  subject  to the  other
     restrictions of Section 3.8.

          "PERMITTED  PAYMENTS"  means with respect to the Company or any of its
     Restricted Subsidiaries (i) any dividend on shares of Capital Stock payable
     (or to the extent  paid)  solely in shares of  Capital  Stock  (other  than
     Redeemable  Stock) or in  options,  warrants  or other  rights to  purchase
     Capital Stock (other than Redeemable Stock) and any distribution of Capital
     Stock (other than  Redeemable  Capital Stock) in respect of the exercise of
     any right to convert or exchange any instrument (whether Debt or equity and
     including  Redeemable  Stock);  (ii) any  dividend  or  other  distribution
     payable  to the  Company  by any of  its  Restricted  Subsidiaries  or by a
     Restricted   Subsidiary  to  another  Restricted   Subsidiary;   (iii)  the
     repurchase or other  acquisition  or retirement  for value of any shares of
     the  Company's  Capital  Stock,  or any  option,  warrant or other right to
     purchase shares of the Company's  Capital Stock with additional  shares of,
     or out of the  proceeds of a  substantially  contemporaneous  issuance  of,
     Capital Stock other than Redeemable Stock (unless the redemption provisions
     of such Redeemable Stock prohibit the redemption  thereof prior to the date
     on which the  Capital  Stock to be  acquired  or  retired  was by its terms
     required to be redeemed);  (iv) any defeasance,  redemption,  repurchase or
     other acquisition for value of any Debt which by its terms ranks pari passu
     with,  or  subordinate  in right of payment to the Notes with the  proceeds
     from the issuance of (x) Debt which is also pari passu with the Notes or


                                       15





     subordinate  to the Notes at least to the  extent  and in the manner as the
     Debt  to be  defeased,  redeemed,  repurchased  or  otherwise  acquired  is
     subordinate in right of payment to, the Notes;  provided that such new pari
     passu or subordinated  Debt provides for no payments of principal by way of
     sinking fund, mandatory  redemption or otherwise (including  defeasance) by
     the Company  (including,  without  limitation,  at the option of the holder
     thereof  other than an option  given to a holder  pursuant  to a "change of
     control" or  "limitation on asset sale" covenant which is no more favorable
     to the holders of such Debt than the provisions contained in the Debt being
     replaced or, if none,  Sections 3.6 and 3.10) prior to the maturity of Debt
     being replaced and the proceeds of such new pari passu or subordinated Debt
     are  utilized  for such  purpose  within 45 days of issuance or (y) Capital
     Stock (other than Redeemable  Stock);  (v) in respect of any actual payment
     on account of an  Investment  which is not fixed in amount at the time when
     made,  the amount  determined  by the Board of Directors to be a Restricted
     Payment on the date such Investment was originally deemed to have been made
     (the  "ORIGINAL  RESTRICTED  PAYMENT  CHARGE")  plus an amount equal to the
     interest on a  hypothetical  investment in a principal  amount equal to the
     Original  Restricted Payment Charge assuming interest at the rate of 7% per
     annum compounded annually for a period beginning on the date the Investment
     was  originally  deemed to have been made and  ending  with  respect to any
     portion of the Original Restricted Payment Charge actually paid on the date
     of actual payment,  less any actual payments  previously made on account of
     such Investment;  provided that the Permitted Payment under this clause (v)
     shall in no event exceed the payment  actually made;  (vi) the  declaration
     and  payment of  dividends  to  holders,  or any  payment on account of the
     purchase, redemption,  retirement or acquisition for value, of any class or
     series of Redeemable Stock; or (vii) a Permitted Investment.

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

          "POWER  SUPPLY  BUSINESS"  means an electric  power or thermal  energy
     generation  or  cogeneration  facility or related  facilities,  or electric
     power  transmission,  distribution,  fuel  supply  or  fuel  transportation
     facilities,  or any combination  thereof,  all subject to related  security
     interests under related project financing  arrangements,  together with its
     or their related power supply, thermal energy and fuel contracts as well as
     other contractual arrangements with customers, suppliers and contractors.


                                       16





          "PREFERRED  STOCK"  means,  with  respect to any  Person,  any and all
     shares, interests, participations or other equivalents (however designated,
     whether  voting or  non-voting)  of preferred or  preference  stock of such
     Person which is outstanding or issued on or after the Closing Date.

          "PROPERTY" of any Person means all types of real, personal,  tangible,
     intangible or mixed  property  owned by such Person whether or not included
     in the most recent consolidated balance sheet of such Person under GAAP.

          "QUALIFIED  CAPITAL STOCK" means any Capital Stock of a Person that is
     not Redeemable Stock.

          "REDEEMABLE  STOCK" means any class or series of Capital  Stock of any
     Person that by its terms or otherwise is (i) required to be redeemed  prior
     to the Stated  Maturity of the Notes,  (ii) redeemable at the option of the
     holder of such  class or series of  Capital  Stock at any time prior to the
     Stated Maturity of the Notes or (iii)  convertible into or exchangeable for
     (unless  solely at the option of the Company)  Capital Stock referred to in
     clause (i) or (ii) above or Debt having a scheduled  maturity  prior to the
     Stated  Maturity of the Notes;  provided  that any Capital Stock that would
     not constitute  Redeemable Stock but for provisions  thereof giving holders
     thereof  the right to require  the  Company to  repurchase  or redeem  such
     Capital  Stock  upon the  occurrence  of an "ASSET  SALE" or a  "CHANGE  OF
     CONTROL"  occurring  prior to the Stated  Maturity  of the Notes  shall not
     constitute  Redeemable  Stock if the "ASSET  SALE" or  "CHANGE OF  CONTROL"
     provision  applicable  to such  Capital  Stock is no more  favorable to the
     holders of such Capital Stock than the provisions contained in Sections 3.6
     and 3.10,  and such Capital  Stock  specifically  provides that the Company
     will not  repurchase  or redeem any such  Capital  Stock  pursuant  to such
     provisions  prior  to the  Company's  repurchase  of Notes  required  to be
     repurchased by the Company under Sections 3.6 and 3.10.

          "REFERENCE  PERIOD" means the four fiscal quarters for which financial
     information is available preceding the date of a transaction giving rise to
     the need to make a financial calculation.

          "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.

          "RESTRICTED  PAYMENT"  means,  with  respect  to any  Person,  (i) any
     dividend or other distribution on any shares of such Person's Capital


                                       17





     Stock; (ii) any payment on account of the purchase, redemption,  retirement
     or  acquisition  for  value  of such  Person's  Capital  Stock;  (iii)  any
     defeasance,  redemption,  repurchase or other acquisition or retirement for
     value  prior to  scheduled  maturity of any Debt  subordinated  in right of
     payment to the Notes and having a maturity  date after the  maturity of the
     Notes; (iv) any Investment in a Restricted  Subsidiary after the occurrence
     of an  event  of  default,  as  defined  in  any  indenture  or  instrument
     evidencing  or under which such  Restricted  Subsidiary  has at the Closing
     Date or shall  thereafter have  outstanding  any Debt,  shall happen and be
     continuing;  (v) any  Investment in an  Unrestricted  Subsidiary;  (vi) any
     Investment  made in an Affiliate  (other than a Person that  constitutes an
     Affiliate  solely because of the Company's,  or a Restricted  Subsidiary of
     the  Company's,  control of such Person) and (vii) the  conversion  of such
     Person's  Capital  Stock  into  Debt  of  such  Person  or  its  Restricted
     Subsidiaries. Notwithstanding the foregoing, "RESTRICTED PAYMENT" shall not
     include any Permitted Payment.

          "RESTRICTED   SUBSIDIARY"   means  any   Subsidiary   other   than  an
     Unrestricted Subsidiary.

          "SENIOR  DEBT"  means  the  principal  of (and  premium,  if any)  and
     interest on all Debt of the Company  whether  created,  incurred or assumed
     before,  on or after the date of the issuance of the  Securities;  provided
     that  Senior  Debt  shall  not  include  (i) the  Company's  9 3/4%  Senior
     Subordinated  Notes due 2000 which rank pari passu to the Securities,  (ii)
     Debt of the Company to any  Affiliate,  (iii) Debt that,  when incurred and
     without  respect to any election under Section  1111(b) of Title 11, United
     States Code,  was without  recourse to the Company,  (iv) any other Debt of
     the Company which by the terms of the instrument creating or evidencing the
     same are specifically designated as not being senior in right of payment to
     the Securities and (v) Redeemable Stock of the Company.

          "SIGNIFICANT  SUBSIDIARY"  of a  Person  means,  as of any  date,  any
     Restricted  Subsidiary  which has two or more of the following  attributes:
     (i) it  contributes  20% or more of such Person's  Excess Cash Flow for its
     most recently  completed  fiscal quarter or (ii) it contributes 15% or more
     of Net Income before tax of such Person and its  Consolidated  Subsidiaries
     for such  Person's  most  recently  completed  fiscal  quarter  or (iii) it
     constitutes 20% or more of Consolidated  Total Assets of such Person at the
     end of such Person's most recently completed fiscal quarter.

          "STATED  MATURITY"  means,  with  respect to any debt  security or any
     installment of interest  thereon,  the date specified in such debt security
     as


                                       18





     the fixed date on which any  principal  of such debt  security  or any such
     installment of interest is due and payable.

          "SUBSIDIARY"  means,  with respect to any Person,  any  corporation or
     other  entity of which a majority of the Capital  Stock or other  ownership
     interests  having ordinary voting power to elect a majority of the board of
     directors or other  persons  performing  similar  functions are at the time
     directly or indirectly owned by such Person.

          "SUBSIDIARY  GUARANTORS"  means (i) prior to the first day, if any, on
     which the  Company's  long-term  debt is rated BBB- or higher by Standard &
     Poor's Corporation and Baa3 or higher by Moody's Investors Services,  Inc.,
     AES Oklahoma and AES Hawaii,  and (ii) on and after such first day, if any,
     AES Hawaii.

          "TRADE  PAYABLES"  means,  with  respect to any Person,  any  accounts
     payable or any other indebtedness or monetary obligation to trade creditors
     created,  assumed or  Guaranteed  by such  Person or any of its  Restricted
     Subsidiaries  arising in the ordinary course of business in connection with
     the acquisition of goods or services.

          "UNRELATED  BUSINESS"  means any business not of the same general type
     now conducted by the Company and its Restricted Subsidiaries.

          "UNRESTRICTED SUBSIDIARY" means (i) any Subsidiary of the Company that
     at the time of determination shall be designated an Unrestricted Subsidiary
     by the  Board  of  Directors  in the  manner  provided  below  and (ii) any
     Subsidiary  of an  Unrestricted  Subsidiary.  The  Board of  Directors  may
     designate any Restricted  Subsidiary (including any newly acquired or newly
     formed  Subsidiary of the Company) to be an Unrestricted  Subsidiary unless
     such Subsidiary owns any Capital Stock of, or owns or holds any Lien on any
     property  of,  the  Company  or any  Restricted  Subsidiary  that  is not a
     Subsidiary  of the  Subsidiary to be so  designated,  provided that (A) any
     Guarantee by the Company or any  Restricted  Subsidiary  of any Debt of the
     Subsidiary being so designated shall be deemed an "INCURRENCE" of such Debt
     and an "INVESTMENT" by the Company or such Restricted  Subsidiary (or both,
     if  applicable)  at the  time  of  such  designation;  (B)  either  (I) the
     Subsidiary to be so  designated  has total assets of $1,000 or less or (II)
     if such Subsidiary has assets greater than $1,000,  such designation  would
     be permitted  under Section 3.8 and (C) if  applicable,  the  Incurrence of
     Debt and the Investment  referred to in clause (A) of this proviso would be
     permitted  under Sections 3.4 and 3.8. The Board of Directors may designate
     any


                                       19





     Unrestricted  Subsidiary  to  be a  Restricted  Subsidiary;  provided  that
     immediately  after giving effect to such designation (x) all Liens and Debt
     of  such  Unrestricted   Subsidiary  outstanding   immediately  after  such
     designation  would,  if Incurred at such time,  have been  permitted  to be
     incurred for all purposes of this  Indenture and (y) no Default or Event of
     Default shall have occurred and be continuing.  Any such designation by the
     Board of Directors  shall be  evidenced  to the Trustee by promptly  filing
     with the  Trustee  a copy of the  Board  Resolution  giving  effect to such
     designation and an Officers'  Certificate  certifying that such designation
     complied with the foregoing provisions.

          "U.S.  GOVERNMENT  OBLIGATIONS"  means securities which are (i) direct
     obligations  of the U.S. 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 U.S. the payment of which is
     unconditionally  guaranteed  as a full faith and credit  obligation  by the
     U.S.,  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  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 of such Person.

          "WHOLLY-OWNED  SUBSIDIARY"  means,  with  respect to any  Person,  any
     Restricted  Subsidiary  of such  Person if all the  Capital  Stock or other
     ownership  interests in such Restricted  Subsidiary  having ordinary voting
     power to elect the  entire  board of  directors  or  entire  group of other
     persons performing similar functions (other than any director's  qualifying
     shares or Investments by foreign  nationals  mandated by applicable law) is
     owned directly or indirectly by such Person."

     SECTION 3. Amendment of Section 3 of First Supplemental Indenture.  Section
3.1 through Section 3.11 of the First  Supplemental  Indenture is hereby amended
to read in its entirety as follows:


                                       20





          "Section 3. In addition to all  covenants  described  in the  Original
     Indenture, the Company covenants and agrees with the Trustee as follows:

          Section 3.1 Limitation on Business.

          The Company (a) shall  continue,  and shall  cause each  Material  AES
     Entity to  continue,  to engage in business of the same general type as now
     conducted  by the Company  and its  Restricted  Subsidiaries  and (b) shall
     continue,  and shall cause each Material AES Entity to continue, to operate
     its and their  respective  businesses on a basis  substantially  consistent
     with the policies and  standards of the Company or such Material AES Entity
     as in effect on the Closing Date.

          Section  3.2  Limitation  on  Restricted  Subsidiary  Investments  and
     Mergers.

          The Company shall not permit any Restricted Subsidiary with any direct
     or indirect  interest in a Power Supply Business to make any Investment in,
     or to consolidate or merge with, any other Person with a direct or indirect
     interest in any other Power Supply Business or any Unrelated  Business.  In
     addition,  the Company will not permit any Restricted  Subsidiary  with any
     direct  or  indirect  interest  in  any  Unrelated  Business  to  make  any
     Investment  in, or to  consolidate  or merge with,  any other Person with a
     direct or  indirect  interest  in any Power  Supply  Business  or any other
     Unrelated Business.  The Company's  obligation to comply with this covenant
     shall terminate if and when the Notes become Investment Grade.

          The foregoing restrictions shall not apply to any Intermediate Holding
     Company;  provided that (i) each such Intermediate Holding Company's direct
     and indirect  interest in any Power Supply  Business or Unrelated  Business
     shall be limited to the ownership of Capital Stock or Debt obligations of a
     Person with a direct or indirect  interest in such Power Supply Business or
     Unrelated  Business;  (ii) no  Intermediate  Holding  Company  shall incur,
     assume,  create or suffer to exist any Debt  (including  any  Guarantee  of
     Debt) other than Debt to the Company or Debt permitted under clauses (iii),
     (viii) and (xi) of Section  3.4(b);  and (iii) no Lien shall exist upon any
     assets  of such  Intermediate  Holding  Company  whether  now or  hereafter
     acquired,  except  for  Liens  upon  the  Capital  Stock  of  a  Restricted
     Subsidiary  of an  Intermediate  Holding  Company  securing  Debt  of  such
     Restricted Subsidiary and Liens securing Debt permitted under clauses (iii)
     and (xi) of Section 3.4(b).


                                       21





          Section 3.3 Limitation on Debt.

               (a) The Company shall not Incur any Debt,  including  Acquisition
          Debt,  unless after giving  effect to the  Incurrence of such Debt and
          the receipt  and  application  of the  proceeds  therefrom,  the Fixed
          Charge  Ratio  of the  Company  would  be  greater  than  2 to 1.  The
          Company's  obligation to comply with this  covenant will  terminate if
          and when the Notes become Investment Grade.

               (b) Notwithstanding the foregoing, the Company may Incur each and
          all of the following:

               (i) Debt under or in respect of the Bank Credit  Agreement  in an
          aggregate  principal  amount at any one time outstanding not to exceed
          $600 million;

               (ii) Debt  issued in exchange  for, or the  proceeds of which are
          used to refinance,  outstanding  Notes or other Debt of the Company in
          an amount (or, if such new Debt  provides  for an amount less than the
          principal  amount  thereof to be due and payable upon a declaration of
          acceleration  thereof, with an original issue price) not to exceed the
          amount so exchanged or refinanced (plus accrued interest,  premium, if
          any, and fees and expenses  related to such exchange or  refinancing);
          provided  that (A) the date of any  scheduled  payment of principal by
          way of sinking  fund,  mandatory  redemption  or otherwise  (including
          defeasance) on any Debt so refinanced or exchanged otherwise due after
          the final  scheduled  Maturity Date of the Notes shall not occur prior
          to such Maturity Date as a result of such exchange or refinancing  and
          (B) new Debt the  proceeds of which are used to exchange or  refinance
          the Notes or other Debt of the Company that is  subordinated  in right
          of payment to the Notes shall only be permitted under this clause (ii)
          if (x) in case the Notes are exchanged or refinanced in part, such new
          Debt,  by its terms or by the  terms of any  agreement  or  instrument
          pursuant to which such Debt is issued,  is  expressly  made pari passu
          with, or subordinate in right of payment to, the remaining  Notes, (y)
          in case the Debt to be  exchanged or  refinanced  is  subordinated  in
          right of payment to the Notes,  such new Debt,  by its terms or by the
          terms of any  agreement or  instrument  pursuant to which such Debt is
          issued,  is  expressly  made  subordinate  in right of  payment to the
          Notes,  at  least to the  extent  that  the  Debt to be  exchanged  or
          refinanced is subordinated in right of payment to the Notes and (z) in
          case the Notes are  exchanged or  refinanced in part or the Debt to be
          exchanged or  refinanced  is  subordinated  in right of payment to the
          Notes,  as of the date the new Debt is  Incurred,  the Average Life of
          the new Debt shall be equal to or


                                       22





          greater  than the Average Life of the Notes or Debt to be exchanged or
          refinanced;

               (iii)   Debt  of  the   Company   to  any  of  its   Consolidated
          Subsidiaries,  except that any transfer of such Debt by a Consolidated
          Subsidiary  (other than to another  Consolidated  Subsidiary)  will be
          deemed  to be an  Incurrence  of  Debt;  provided  that  such  Debt is
          expressly subordinated in right of payment to the Notes; and

               (iv) Debt in an  aggregate  principal  amount  not to exceed  $50
          million at any one time outstanding.

               (c) For purposes of  determining  any  particular  amount of Debt
          under this Section 3.3,  Guarantees of, or obligations with respect to
          letters  of  credit   supporting,   Debt  otherwise  included  in  the
          determination  of such  particular  amount shall not be included.  For
          purposes of determining  compliance  with this Section 3.3, (A) in the
          event that an item of Debt meets the  criteria of more than one of the
          types of Debt described in the above clauses, the Company, in its sole
          discretion,  shall  classify such item of Debt and only be required to
          include  the amount and type of such Debt in one of such  clauses  and
          (B)  the  amount  of Debt  issued  at a price  that is less  than  the
          principal amount thereof shall be equal to the amount of the liability
          in respect thereof determined in conformity with GAAP.

               Section 3.4 Limitation on Restricted Subsidiary Debt.

               (a) The Company  shall not permit any  Restricted  Subsidiary  to
          Incur,  directly or indirectly,  any Debt, including Acquisition Debt.
          The Company's  obligation to comply with this covenant will  terminate
          if and when the Notes become Investment Grade.

               (b) Notwithstanding the foregoing,  each and all of the following
          Debt may be Incurred by a Restricted Subsidiary:

               (i) Debt outstanding as of the Closing Date;

               (ii) Debt Incurred for any purpose  (including without limitation
          the  purposes  set forth in clause  (iii)  below) to the extent of the
          amount thereof that is also Debt of the Company and is permitted under
          Section 3.3;

               (iii) Debt  Incurred  to finance  the  development,  acquisition,
          construction,   maintenance,   working  capital  requirements  in  the
          ordinary


                                       23





          course of business  consistent  with past  practice or  operation of a
          Power Supply  Business or  Unrelated  Business in which the Company or
          any Restricted Subsidiary has a direct or indirect interest;  provided
          that (a) such Debt shall be permitted  under this clause (iii) only to
          the  extent of the amount  thereof  which (x) is  Non-Recourse  to the
          Company and (y) is Non-Recourse to any other Restricted  Subsidiary of
          the Company other than Restricted  Subsidiaries which represented less
          than 33% of the  Consolidated  EBITDA of the Company for the Reference
          Period, and (b) upon the commencement of commercial operations of such
          Power Supply  Business or, in the case of an acquisition of such Power
          Supply  Business  or  Unrelated  Business,   upon  the  date  of  such
          acquisition,   the  Company   directly   or  through  its   Restricted
          Subsidiaries  either (x) controls,  under an operating and  management
          agreement or otherwise, the day to day management and operation of the
          Power  Supply  Business or  Unrelated  Business so financed or (y) has
          significant  influence over the management and operation of such Power
          Supply Business or Unrelated Business;

               (iv) Debt  issued in exchange  for, or the  proceeds of which are
          used to  refinance,  outstanding  Debt of such  Restricted  Subsidiary
          otherwise  permitted under the Indenture in an amount (or, if such new
          Debt provides for an amount less than the principal  amount thereof to
          be due and payable upon a declaration of acceleration thereof, with an
          original  issue  price)  not to  exceed  the  amount so  exchanged  or
          refinanced  (plus  accrued  interest,  premium,  if any,  and fees and
          expenses  related to such exchange or  refinancing  plus any principal
          amounts  previously  repaid);  provided that (a) the new Debt shall be
          Non-Recourse  to the  Company  to the  same  extent  as the Debt to be
          exchanged  or  refinanced,  (b) if such  Restricted  Subsidiary  has a
          direct or indirect  interest in any Power Supply Business or Unrelated
          Business,  the new Debt shall be Non- Recourse to any other Restricted
          Subsidiary of the Company  other than  Restricted  Subsidiaries  which
          represented  less than 33% of the  Consolidated  EBITDA of the Company
          for the Reference  Period,  (c) the date of any  scheduled  payment of
          principal by way of sinking  fund,  mandatory  redemption or otherwise
          (including   defeasance)  on  any  Debt  so  refinanced  or  exchanged
          otherwise  due after the final  scheduled  Maturity  Date of the Notes
          shall  not  occur  prior to such  Maturity  Date as a  result  of such
          exchange or refinancing and (d) if the new Debt  refinances  principal
          amounts  previously  repaid, (x) such new Debt shall be permitted only
          if on the date such new Debt is Incurred,  the Company  could incur at
          least $1 of Debt under  Section  3.3(a) and (y) the proceeds from such
          new Debt are not to be used to make any Restricted Payments;


                                       24





               (v)  Guarantees  of Debt of the  Company  under  the Bank  Credit
          Agreement;

               (vi) Debt Incurred to support the  performance  obligations  of a
          Restricted Subsidiary engaged in providing construction  management or
          operating services to a Power Supply Business;  provided that (a) such
          Debt shall be  permitted  under this clause (vi) only to the extent of
          the amount  thereof which is  Non-Recourse  to the Company and is Non-
          Recourse to any other Restricted  Subsidiary of the Company other than
          Restricted  Subsidiaries  which  represented  less  than  33%  of  the
          Consolidated  EBITDA of the Company for the Reference Period,  and (b)
          upon the  commencement  of  commercial  operation of such Power Supply
          Business  or in the  case  of an  acquisition  of  such  Power  Supply
          Business,  upon the date of such acquisition,  the Company directly or
          through its  Restricted  Subsidiaries  either (x)  controls,  under an
          operating  and  management  agreement  or  otherwise,  the  day to day
          management  and  operation  of such Power  Supply  Business or (y) has
          significant  influence over the management and operation of such Power
          Supply Business;

               (vii) Debt in an aggregate amount for all Restricted Subsidiaries
          at any one time  outstanding of not more than $50 million  Incurred to
          finance the on-going operation,  but not any expansion or improvement,
          of a Power  Supply  Business  or  Unrelated  Business  in  which  such
          Restricted Subsidiary has a direct or indirect interest; provided that
          such Debt  shall be  permitted  under  this  clause  (vii) only to the
          extent it is Non-Recourse  to the Company and to any other  Restricted
          Subsidiary of the Company  other than  Restricted  Subsidiaries  which
          represented  less than 33% of the  Consolidated  EBITDA of the Company
          for the Reference Period;

               (viii) Debt of any  Restricted  Subsidiary of the Company owed to
          (A) the Company or (B) any Restricted Subsidiary of the Company;

               (ix) Debt in respect of  Currency  Agreements  or  Interest  Rate
          Agreements;

               (x) Debt that is Non-Recourse to the Company and Non- Recourse to
          any other  Restricted  Subsidiary of the Company other than Restricted
          Subsidiaries  which  represented  less  than  33% of the  Consolidated
          EBITDA of the Company  for the  Reference  Period,  only to the extent
          that the  proceeds  of such Debt are  received  by the  Company  or an
          Intermediate  Holding  Company as a result of such proceeds being used
          to pay  dividends or make  distributions  on the Capital Stock of such
          Restricted Subsidiary and any other Restricted Subsidiary in the chain
          of


                                       25





          ownership between the Company or such Intermediate Holding Company and
          such Restricted Subsidiary;

               (xi)   Acquisition   Debt  and  Debt   incurred  to  finance  the
          acquisition of a Power Supply Business; provided that such Acquisition
          Debt and other Debt is  Non-Recourse to the Company or any Person that
          was a Restricted  Subsidiary of the Company  immediately prior to such
          Incurrence;  and  provided  further that where any Debt is incurred to
          finance the  acquisition of more than one Power Supply  Business,  all
          such  acquisitions  shall have occurred within 180 days of each other;
          and

               (xii)  Debt  of  the  type  described  in  clause  (iii)  of  the
          definition  thereof the  Incurrence  of which  causes a  corresponding
          reduction in any debt service or other  similar cash reserve  required
          to be  maintained  in  connection  with  any  Debt of such  Restricted
          Subsidiary permitted by clause (iii) above and (to the extent that the
          same  constitutes a refinancing  of Debt  permitted  under such clause
          (iii)),  clause (iv) above,  in each case, only to the extent that the
          proceeds from such reserve reduction are received by the Company or an
          Intermediate  Holding  Company as a result of such proceeds being used
          to pay  dividends or make  distributions  on the Capital Stock of such
          Restricted Subsidiary and any other Restricted Subsidiary in the chain
          of ownership between the Company or such Intermediate  Holding Company
          and such Restricted Subsidiary.

               (c) For purposes of determining compliance with this Section 4.9,
          (A) in the event that an item of Debt meets the  criteria of more than
          one of the types of Debt described in the above clauses,  the Company,
          in its sole  discretion,  shall classify such item of Debt and only be
          required  to  include  the amount and type of such Debt in one of such
          clauses and (B) the amount of Debt issued at a price that is less than
          the  principal  amount  thereof  shall be equal to the  amount  of the
          liability in respect thereof determined in conformity with GAAP.

               Section 3.5 Limitation on Additional Tiers of Senior Subordinated
          Debt.

               The  Company  shall not Incur or suffer to exist any Debt,  other
          than Debt  evidenced  by the Notes,  that is  subordinate  in right of
          payment to any Senior Debt unless such Debt, by its terms or the terms
          of the  instrument  creating or evidencing  it, is pari passu with, or
          subordinate in right of payment to, the Notes;  provided that any Debt
          of  the  Company  or  any  of its  Restricted  Subsidiaries  which  is
          outstanding  on the Closing Date shall be excluded  from the operation
          of this covenant.


                                       26



          Section 3.6 Change of Control.

          (a) Upon a Change of  Control,  each  Holder of the Notes  shall have,
     subject to Article 11 of the Original Indenture,  the right to require that
     the Company  repurchase  such Holder's Notes at a repurchase  price in cash
     equal to 101% of the  principal  amount  thereof  plus  accrued  and unpaid
     interest,  if any, to the date of  repurchase  in  accordance  with Section
     3.6(b) hereof.

          (b) Within 30 days following any Change of Control,  the Company shall
     mail a  notice  to each  Holder  of the  Notes  at  their  last  registered
     addresses 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  Company  to  repurchase  such  Holder's  Notes at a
     repurchase price in cash equal to 101% of the principal amount thereof plus
     accrued and unpaid 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  after  giving  effect  to such  Change  of
     Control);

          (3) the  repurchase  date (which  shall be not earlier than 30 days or
     later than 60 days from the date such  notice is mailed)  (the  "Repurchase
     Date");

          (4) that any Note not tendered will continue to accrue interest;

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

          (6) that  Holders  electing  to have a Note  purchased  pursuant  to a
     Change of Control  Offer will be required to surrender  the Note,  with the
     form  entitled  "Option of Holder to Elect  Purchase" on the reverse of the
     Note completed,  to the Paying Agent at the address specified in the notice
     prior to the close of business on 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 facsimile transmission or letter

                                       27





     setting  forth the name of the Holder,  the  principal  amount of Notes the
     Holder  delivered  for  purchase,  and a  statement  that  such  Holder  is
     withdrawing his election to have such Notes purchased; and

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

          (c) On the Repurchase Date, the Company shall:

          (i) accept for payment Notes or portions thereof tendered  pursuant to
     the Change of Control Offer;

          (ii) deposit by 10:00 a.m., New York City time, with the Trustee money
     sufficient  to pay the purchase  price of all Notes or portions  thereof so
     tendered; and

          (iii)  deliver  or  cause  to be  delivered  to the  Trustee  Notes so
     accepted  together with an Officers'  Certificate  identifying the Notes or
     portions thereof tendered to the Company.

          The  Trustee  shall  promptly  mail to the  Holders  of the  Notes  so
     accepted  payment in an amount  equal to the purchase  price,  and promptly
     authenticate  and make available for delivery to such Holders a new Note in
     a  principal   amount  equal  to  any  unpurchased   portion  of  the  Note
     surrendered.  The Company will publicly  announce the results of the Change
     of Control Offer on or as soon as practicable after the Repurchase Date.

          The Company  shall  comply with all  applicable  tender  offer  rules,
     including  without  limitation,  Rule  14e-1  under the  Exchange  Act,  in
     connection with a Change of Control Offer.

                                       28




          Section 3.7 Limitation on Transactions with Affiliates.

          The  Company  shall not,  and shall not  permit any of its  Restricted
     Subsidiaries   to,  directly  or  indirectly  enter  into  any  transaction
     (including,  without limitation,  the sale, purchase or lease of any assets
     or  properties  or the  rendering  of  any  services)  involving  aggregate
     consideration  in excess of $5 million  with any  Affiliate  (other  than a
     Person that  constitutes an Affiliate  solely because of the Company's or a
     Subsidiary  of  the  Company's  control  of  such  Person  except  for  any
     Unrestricted  Subsidiary)  or holder of 5% or more of any class of  Capital
     Stock of the Company except for transactions (including, subject to Section
     3.8,  any loans or  advances  by or to, or  Guarantee  on  behalf  of,  any
     Affiliate  or any such  holder)  made in good  faith the terms of which are
     fair and reasonable to the Company or such  Restricted  Subsidiary,  as the
     case may be,  and are at least as  favorable  as the terms  which  could be
     obtained by the Company or such Restricted Subsidiary,  as the case may be,
     in a comparable  transaction made on an arm's-length basis with Persons who
     are not such a holder  or  Affiliate;  provided  that any such  transaction
     shall be  conclusively  deemed to be on terms which are fair and reasonable
     to the Company or any of its Restricted Subsidiaries and on terms which are
     at  least  as  favorable  as  the  terms  which  could  be  obtained  on an
     arm's-length  basis with  Persons who are not such a holder or Affiliate if
     such  transaction  is  approved by a majority  of the  Company's  directors
     (including a majority of the Company's independent directors); and provided
     further,  that with respect to the purchase or disposition of assets of the
     Company or any of its  Restricted  Subsidiaries  having a net book value in
     excess of $15 million,  in addition to approval of its Board of  Directors,
     the Company  shall  obtain a written  opinion of an  Independent  Financial
     Advisor stating that the terms of such  transaction are fair to the Company
     or its Restricted Subsidiary, as the case may be, from a financial point of
     view;  and  provided   further  that  the  fairness,   reasonableness   and
     arm's-length  nature  of the  terms of any  transaction  which is part of a
     series of related  transactions may be determined on the basis of the terms
     of the series of related  transactions  taken as a whole.  This Section 3.7
     shall not  apply to (a)  transactions  between  the  Company  or any of its
     Restricted  Subsidiaries  and any  employee  of the  Company  or any of its
     Restricted  Subsidiaries that are approved by the Board of Directors or any
     committee of the Board of Directors consisting of the Company's independent
     directors,  (b) the payment of  reasonable  and  customary  regular fees to
     directors of the Company or a Restricted  Subsidiary,  (c) any  transaction
     between the Company and any of its Consolidated Subsidiaries or between any
     of its  Consolidated  Subsidiaries,  (d)  any  Permitted  Payment  and  any
     Restricted Payment not otherwise prohibited by Section 3.8 or (e) the

                                       29





     provision of general  corporate  administrative,  operating and  management
     services,   including,   without  limitation,   procurement,   construction
     engineering,  construction  administration,  legal, accounting,  financial,
     money management, risk management,  personnel,  administration and business
     planning services, in each case, in the ordinary course.

          Section 3.8 Limitation on Restricted Payments.

          The Company shall not, and shall not permit any Restricted  Subsidiary
     to,  directly or indirectly,  make any  Restricted  Payment if after giving
     effect to such Restricted Payment:

          (a) an 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;

          (b) the  Company  could  not Incur at least $1 of Debt  under  Section
     3.3(a); or

          (c) the aggregate  amount  expended by the Company and its  Restricted
     Subsidiaries  for all  Restricted  Payments  (the  amount of any  single or
     related  series of Restricted  Payments so expended or  distributed,  if in
     excess of $15  million  and other than in cash,  to be  determined  in good
     faith by the Board of Directors,  as evidenced by a Board resolution) after
     April 1, 1997 shall exceed the sum of:

          (1)  50%  of the  Net  Income  of the  Company  and  its  Consolidated
     Subsidiaries for the period (taken as one accounting  period)  beginning on
     April 1, 1997 and  ending on the last day of the fiscal  quarter  for which
     financial  information is available  immediately  prior to the date of such
     calculation; provided that if Net Income for such period is less than zero,
     then minus 100% of such net loss; plus

          (2) the  aggregate  net proceeds  (including  the fair market value of
     proceeds  other  than  cash,  as  determined  in good faith by the Board of
     Directors,  as evidenced by a Board  Resolution if the fair market value of
     such  non-cash  proceeds is in excess of $15  million)  received by (A) the
     Company from and after April 1, 1997 from the issuance and sale (other than
     to a Restricted  Subsidiary)  of its Capital  Stock  (excluding  Redeemable
     Stock, but including  Capital Stock other than Redeemable Stock issued upon
     conversion  of, or in exchange for,  Redeemable  Stock or securities  other
     than its Capital Stock),  and warrants,  options and rights to purchase its
     Capital Stock (other than Redeemable Stock), but excluding

                                       30




     the net proceeds from the  issuance,  sale,  exchange,  conversion or other
     disposition of its Capital Stock  convertible  (unless solely at the option
     of the Company)  into (x) any security  other than its Capital Stock or (y)
     its  Redeemable  Stock or (B) a Finance  Subsidiary of the Company from and
     after April 1, 1997 from the  issuance  and sale (other than to the Company
     or a Restricted Subsidiary) of its Qualified Capital Stock; plus

          (3) to the extent not included in clause (1) above,  the net reduction
     in  Investments  of the type  specified in clauses (iv) through (vi) of the
     definition of  Restricted  Payment  resulting  from payments of interest on
     Debt,  dividends,  repayments of loans or advances,  or other  transfers of
     assets to the  Company or other  Person that made the  original  Investment
     from the Person in which such  Investment  was made or  resulting  from the
     sale or  disposition of the Investment or other return of the amount of the
     Investment or from the  redesignation of any  Unrestricted  Subsidiary as a
     Restricted  Subsidiary;  provided  that such  payment,  for purposes of the
     calculation  to be made  pursuant to this clause (3),  shall not exceed the
     amount of the original Investment; plus

          (4) any amount previously  included as a Restricted Payment on account
     of an  obligation  by the Company or any  Restricted  Subsidiary  to make a
     Restricted  Payment  which has not actually been made by the Company or any
     Restricted  Subsidiary  and which is no longer  required  to be paid by the
     Company or any Restricted Subsidiary; plus

          (5) $502 million;

     provided that the foregoing clause (c) shall not prevent the payment of any
     dividend  within 60 days after the date of its declaration if such dividend
     could have been made on the date of its  declaration  without  violation of
     the provisions of this Section 3.8.

          For  purposes of clause  (c)(2)  above,  the  aggregate  net  proceeds
     received by the Company (x) from the issuance of its Capital Stock upon the
     conversion of, or exchange for, securities  evidencing Debt of the Company,
     shall be calculated  on the  assumption  that the gross  proceeds from such
     issuance are equal to the aggregate principal amount (or, if discount Debt,
     the accreted  principal  amount) of the Debt  evidenced by such  securities
     converted or  exchanged  and (y) upon the  conversion  or exchange of other
     securities  of the Company  shall be equal to the aggregate net proceeds of
     the  original  sale of the  securities  so  converted  or exchanged if such
     proceeds of such original sale were not previously

                                       31





     included in any  calculation  for the purposes of clause  (c)(2) above plus
     any additional sums payable upon conversion or exchange.

          The Company's  obligation to comply with this covenant shall terminate
     if and when the Notes become Investment Grade.

          If an  Investment  which the Company or any  Restricted  Subsidiary is
     obligated  to make  either  in part  from  time to time or in  whole in the
     future is fixed in amount by the agreement  setting forth such  obligation,
     for purposes of determining whether such Investment is a Restricted Payment
     permitted under this Section 3.8 or is a Permitted Payment,  the Investment
     shall be deemed to have been made only once, in the amount so fixed, at the
     time the obligation  first arises (and not when payments in respect thereof
     are later  made).  If an  Investment  which the  Company or any  Restricted
     Subsidiary  is  obligated  to make  either  in part from time to time or in
     whole in the future is not fixed in amount by the  agreement  setting forth
     such obligation,  for purposes of determining  whether such Investment is a
     Restricted  Payment  permitted  under this  Section  3.8 or is a  Permitted
     Payment,  the Investment  shall be deemed to have been made at the time the
     obligation  first arises in an amount to be determined in good faith by the
     Board of  Directors,  as  evidenced by a Board  Resolution,  and any actual
     payments in respect of such  Investment  shall be deemed to be  Investments
     made on the date of payment thereof.  Subject to the terms of clause (v) of
     the  definition  of  Permitted  Payments,  such  later  Investments  may be
     Permitted Payments.

          Section 3.9  Limitation  on Dividend  and other  Payment  Restrictions
     Affecting Subsidiaries.

          The Company shall not, and shall not permit any Restricted  Subsidiary
     to,  create or otherwise  cause or suffer to exist or become  effective any
     consensual  encumbrance  or  restriction  of any kind on the ability of any
     Restricted  Subsidiary to (i) pay dividends or make any other distributions
     permitted  by  applicable  law on any  Capital  Stock  of  such  Restricted
     Subsidiary  owned by the Company or any other Restricted  Subsidiary,  (ii)
     make  payments  in  respect  of any Debt owed to the  Company  or any other
     Restricted  Subsidiary,  (iii) make loans or advances to the Company or any
     other  Restricted  Subsidiary  or (iv)  transfer any of its Property to the
     Company or any other  Restricted  Subsidiary.  The Company's  obligation to
     comply  with this  covenant  will  terminate  if and when the Notes  become
     Investment Grade.

                                       32




          This Section 3.9 shall not restrict or prohibit  any  encumbrances  or
     restrictions  existing:  (i) in connection  with the Incurrence of any Debt
     permitted under clauses (iii),  (vi),  (vii), (x) or (xi) of Section 3.4(b)
     or with respect to any portion thereof that is also Debt of the Company and
     permitted   under  Section  3.3;   provided  that  such   encumbrances   or
     restrictions  are  required in order to effect such  financing  and are not
     materially  more  restrictive,  taken as a  whole,  on the  ability  of the
     applicable  Restricted  Subsidiary  to make  the  payments,  distributions,
     loans, advances or transfers referred to in clauses (i) through (iv) of the
     preceding  paragraph than encumbrances and restrictions,  taken as a whole,
     customarily accepted (or, in the absence of any industry custom, reasonably
     acceptable)  in  substantially  non-recourse  project  financing,  (ii)  in
     connection  with the execution and delivery of an electric power or thermal
     energy  purchase  contract  to  which  such  Restricted  Subsidiary  is the
     supplying  party  or  other   contracts  with   customers,   suppliers  and
     contractors to which such  Restricted  Subsidiary is a party and where such
     Restricted   Subsidiary  is  engaged  in  the  development,   construction,
     acquisition  or operation of a Power Supply  Business;  provided  that such
     encumbrances or restrictions are required in order to effect such contracts
     and are not materially more  restrictive,  taken as a whole, on the ability
     of  the   applicable   Restricted   Subsidiary   to  make   the   payments,
     distributions,  loans,  advances  or  transfers  referred to in clauses (i)
     through (iv) in the preceding paragraph than encumbrances and restrictions,
     taken as a whole,  customarily accepted (or, in the absence of any industry
     custom,  reasonably  acceptable)  in  substantially   non-recourse  project
     financing,  (iii) in connection  with the  Incurrence of any Debt permitted
     under clause (iv) of Section  3.4(b),  provided that such  encumbrances  or
     restrictions  taken as a whole are not materially  more  restrictive on the
     ability  of the  applicable  Restricted  Subsidiary  to make the  payments,
     distributions,  loans,  advances  or  transfers  referred to in clauses (i)
     through (iv) in the preceding paragraph than those that are then in effect,
     taken as a whole,  in connection  with the Debt so exchanged or refinanced,
     (iv)  in  connection  with  the  Bank  Credit  Agreement  and  the  project
     financing,  electric power and thermal  energy  purchase  arrangements  and
     other contracts with customers,  suppliers and contractors in effect on the
     Closing Date, including extensions,  refinancings, renewals or replacements
     thereof,  (v) pursuant to customary  non-assignment  provisions  in leases,
     (vi) pursuant to  restrictions  imposed  pursuant to any stock  purchase or
     asset  purchase  agreement  pending the  consummation  of the  transactions
     contemplated  thereby,  (vii)  in  connection  with any  Acquisition  Debt,
     provided  that  such   encumbrance  or  restriction  was  not  incurred  in
     contemplation  of the  obligor  becoming  a  Restricted  Subsidiary  of the
     Company,  which encumbrance or restriction is not applicable to any Person,
     or the Property

                                       33




     or assets of any Person,  other than the Person, or the Property or assets,
     acquired, (viii) customary restrictions on transfers of Property subject to
     a Lien which could not materially adversely affect the Company's ability to
     satisfy  its  obligations  under  the  Indenture  and  the  Notes  or  (ix)
     provisions  contained in agreements or  instruments  relating to Debt which
     prohibit  the  transfer  of all or  substantially  all of the assets of the
     obligor  thereunder  unless the transferee  shall assume the obligations of
     the obligor  under such  agreement or  instrument,  in each case;  provided
     that, in the case of clause (iv) above, such encumbrances and restrictions,
     taken  as a  whole,  in any  such  extensions,  refinancings,  renewals  or
     replacements  are not  materially  more  restrictive  on the ability of the
     applicable  Restricted  Subsidiary  to make  the  payments,  distributions,
     loans, advances or transfers referred to in clauses (i) through (iv) in the
     preceding  paragraph than those  encumbrances  or  restrictions  taken as a
     whole in effect immediately before such extension,  refinancing, renewal or
     replacement.  This Section 3.9 shall not prevent the Company from  granting
     any Liens not expressly prohibited hereby.

          Section 3.10 Limitation on Asset Dispositions.

          (a) The  Company  shall not make,  and  shall  not  permit  any of its
     Restricted  Subsidiaries to make, any Asset Disposition  unless the Company
     (or the Restricted  Subsidiary,  as the case may be) receives consideration
     at the time of each  such  Asset  Disposition  at  least  equal to the fair
     market  value of the shares or assets sold or  otherwise  disposed of (such
     amounts in excess of $50 million  determined  in good faith by the Board of
     Directors, as evidenced by a Board Resolution) and either (i) not less than
     75% of the  consideration  received  by the  Company  (or  such  Restricted
     Subsidiary,  as the  case  may be) is in the  form of cash or  property  or
     assets  used or useful in a Power  Supply  Business  or Capital  Stock of a
     Person primarily engaged in a Power Supply Business, provided that any note
     or other obligation received by the Company (or such Restricted Subsidiary,
     as the case may be) that is  converted  into cash  within  180 days of such
     Asset  Disposition  and any  liabilities (as shown on the Company's or such
     Restricted  Subsidiary's  most recent  balance sheet) of the Company or any
     Restricted Subsidiary that are assumed by the transferee of any such assets
     shall be deemed to be cash for purposes of this clause (i), and (ii) first,
     the Net Cash Proceeds of such Asset  Disposition are applied within 90 days
     from the later of the date of such Asset  Disposition or the receipt of Net
     Cash Proceeds related thereto,  to the payment of the principal of, premium
     and  interest  on  any  Senior  Debt  of the  Company  (including  to  cash
     collateralize  letters of credit) and, in connection with any such payment,
     any related loan commitment, standby

                                       34







     facility or the like shall be permanently reduced in an amount equal to the
     principal amount so repaid and second, to the extent such Net Cash Proceeds
     are not  required by the  lenders,  or the terms,  of the Senior Debt to be
     applied in  accordance  with the  foregoing  or, if after  being so applied
     there remain Net Cash Proceeds,  then at the Company's  election,  such Net
     Cash  Proceeds are either (x) invested in the business or businesses of the
     Company or any of its Restricted  Subsidiaries consistent with Section 3.1;
     provided that such investment is made within 365 days from the later of the
     date of such Asset  Disposition  or the  receipt  of the Net Cash  Proceeds
     related  thereto or (y)  applied to the  payment of any Senior  Debt of the
     Company or Debt of any Restricted Subsidiary or any Consolidated Subsidiary
     (other  than Debt owed to the  Company or another  Restricted  Subsidiary),
     and, in  connection  with any such  payment,  any related loan  commitment,
     standby  facility  or the like  shall be  permanently  reduced in an amount
     equal to the  principal  amount  so  repaid;  provided  that  such Net Cash
     Proceeds are so applied  within three  months after the  expiration  of the
     365-day  period  referred  to in clause (x) above or (z)  applied to make a
     tender offer (the "Offer") to purchase  Notes and other Debt of the Company
     from time to time outstanding with similar provisions requiring the Company
     to make an offer to purchase or to redeem such Debt with the proceeds  from
     assets sales,  pro rata in proportion to the respective  principal  amounts
     (or  accreted  values in the case of Debt  issued  with an  original  issue
     discount) of the Notes and such other Debt then  outstanding  at a purchase
     price of 100% of their  principal  amount (or accreted value in the case of
     Debt  issued  with an  original  issue  discount),  plus  accrued  interest
     (subject to  proration in the event of  oversubscription  in the manner set
     forth below).  Notwithstanding the foregoing, to the extent that any or all
     of the Net Cash Proceeds of any Foreign Asset Disposition are prohibited or
     delayed by applicable  local law from being  repatriated  to the U.S.,  the
     Company (or such  Restricted  Subsidiary,  as the case may be) shall not be
     required  to apply the  portion of such Net Cash  Proceeds  so  affected in
     accordance  with  clause  (ii)  above  (other  than  to  repay  Debt of the
     Restricted   Subsidiary   making  such  Asset  Disposition  or  Debt  of  a
     Consolidated  Subsidiary of the Company,  in each case as  contemplated  by
     clause  (ii)  above  and  to  the  extent  the   prohibition  or  delay  on
     repatriation  is not applicable to such repayment and such repayment is not
     in violation of the terms of any Senior Debt) (the Company hereby  agreeing
     to cause the applicable  Restricted Subsidiary to promptly take all actions
     required by the applicable local law to permit such repatriation); provided
     that once such  repatriation  of any such  affected  Net Cash  Proceeds  is
     permitted  under  the  applicable  local  law,  such  repatriation  will be
     immediately effected and such repatriated Net Cash Proceeds will be applied
     in the manner set forth in this Section 3.10. To the extent that  dividends
     or

                                       35




     distributions  of any or all of the Net Cash  Proceeds of any Foreign Asset
     Disposition  would result in a tax liability  greater than that which would
     be  incurred  if  such  Net  Cash   Proceeds  were  not  so  dividended  or
     distributed,  the Net Cash  Proceeds  so  affected  may be  retained by the
     applicable  Restricted Subsidiary for so long as such adverse tax liability
     would continue to be incurred.

          Notwithstanding anything in this covenant to the contrary, the Company
     and any Restricted Subsidiary may make the following Asset Dispositions:

          (i)  a   disposition   resulting   from  the  bona  fide  exercise  by
     governmental authority of its claimed or actual power of eminent domain;

          (ii) a realization upon a security interest;

          (iii) any Permitted  Payment or  Restricted  Payment that is permitted
     hereunder; or

          (iv) any sale, transfer, conveyance, lease or other disposition of the
     Capital Stock or Property of a Restricted  Subsidiary pursuant to the terms
     of any power sales agreement or steam sales agreement or other agreement or
     contract  related to the output or product of, or services  rendered  by, a
     Power  Supply  Business  as to  which  such  Restricted  Subsidiary  is the
     supplying party;  provided that to the extent the Company or any Restricted
     Subsidiary  receives any cash  consideration  in connection with such Asset
     Disposition,  the Net Cash  Proceeds from such Asset  Disposition  shall be
     applied in accordance with clause (ii) of this Section 3.10.

          (b) If the aggregate  purchase  price of Notes and other Debt tendered
     pursuant to an Offer made  pursuant to clause  (ii)(z)  clause (a) above is
     less than the Net Cash  Proceeds  allotted to the purchase of the Notes and
     other Debt, the Company may use the remaining Net Cash Proceeds for general
     corporate  purposes.  The  Company  will not be required to comply with the
     provisions  of clause (ii) in the first  paragraph  of this Section 3.10 if
     the Net Cash Proceeds from one or more Asset  Dispositions  occurring on or
     after the date of the Indenture are less than $40 million in any one fiscal
     year.  Any lesser  amounts so carried  forward  and  cumulated  need not be
     segregated or reserved and may be used for general corporate purposes.

                                       36




          (c) (i)  Promptly,  and in any  event  within  30 days  from the Asset
     Disposition  and the  receipt  of the Net Cash  Proceeds  as to  which  the
     Company  must make an Offer,  the Company  shall be obligated to deliver to
     the  Trustee  and send,  by  first-class  mail to each  Holder of Notes,  a
     written notice stating that:

          (A) an Asset Disposition has occurred and that such Holders may tender
     all or any  portion  of their  Notes  pursuant  to the  Offer  in  integral
     multiples of $1,000 principal amount, at the applicable purchase price;

          (B) any Note not  tendered or accepted  for payment  will  continue to
     accrue interest;

          (C) any Note accepted for payment pursuant to the Offer shall cease to
     accrue interest after the Purchase Date (as defined below); and

          (D) holders of Notes will be entitled  to withdraw  their  election in
     the manner described in clause (iii) of this Section 3.10(c).

          The notice  shall  specify a  purchase  date not less than 30 days nor
     more than 60 days  after the date of such  notice  (the  "Purchase  Date"),
     shall  include all  instructions  and  materials  necessary  to enable each
     holders of Notes to tender  Notes  pursuant to the Offer and shall  contain
     information  concerning  the  business of the Company  which the Company in
     good faith  believes  will enable such holder to make an informed  decision
     (which at a minimum will include (1) the most recently  filed Annual Report
     on Form 10-K (including audited consolidated  financial  statements) of the
     Company,  the most recent  subsequently filed Quarterly Report on Form 10-Q
     and any Current Report on Form 8-K of the Company filed  subsequent to such
     Quarterly  Report,  other  than  Current  Reports  describing  other  asset
     dispositions   otherwise   described   in  the   offering   materials   (or
     corresponding  successor  reports  or  reports  otherwise  required  to  be
     delivered  to holder of Notes if the  Company is no longer  filing  reports
     pursuant to the  Securities  Exchange Act of 1934),  (2) a  description  of
     material  developments in the Company's business  subsequent to the date of
     the latest of such  Reports,  and (3) if  material,  appropriate  pro forma
     financial information).

          (ii) Not later than the date upon which written  notice of an Offer is
     delivered to the Trustee as provided  above,  the Company  shall deliver to
     the Trustee an Officers' Certificate as to (A) the amount of the Offer (the
     "Offer Amount"), (B) the allocation of the Net Cash Proceeds

                                       37




     pursuant to which such Offer is being made and (C) the  compliance  of such
     allocation  with the  provisions of this Section  3.10.  Not later than one
     Business Day prior to the Purchase Date, the Company shall also irrevocably
     deposit  with the  Trustee or with the Paying  Agent (or, if the Company is
     acting as its own Paying Agent, segregate and hold in trust) in immediately
     available  funds an amount equal to the Offer Amount to be held for payment
     in accordance with the provisions of this Section 3.10. Upon the expiration
     of the period for which the Offer  remains open (the "Offer  Period"),  the
     Company  shall  deliver to the Trustee the Notes or portions  thereof which
     have been properly  tendered to and are to be accepted by the Company.  The
     Trustee or the Paying  Agent (if any),  or the Company if acting as its own
     Paying Agent,  shall, on the Purchase Date, mail or deliver payment to each
     tendering Holder in the amount of the purchase price. In the event that the
     aggregate  purchase  price of the Notes  delivered  by the  Company  to the
     Trustee or the Paying Agent (if the Company is not acting as its own Paying
     Agent) is less than the Offer Amount,  the Trustee or the Paying Agent,  as
     the case may be, shall deliver the excess to the Company  immediately after
     the expiration of the Offer Period.

          (iii) Any holder of Notes electing to have his Notes purchased will be
     required to surrender such Notes,  with an appropriate form duly completed,
     to the  Trustee  at the  address  specified  in the  notice by the close of
     business at least one Business Day prior to the Purchase  Date.  Holders of
     Notes will be entitled to withdraw  their election if the Trustee or Paying
     Agent  (if any)  receives  not  later  than the  close of  business  on the
     Business Day prior to the Purchase Date a facsimile  transmission or letter
     setting  forth the name of the Holder and a  statement  that such Holder is
     withdrawing  his election to have all or a portion of his Notes  purchased.
     If at the expiration of the Offer Period the aggregate  principal amount of
     Notes surrendered by holders of Notes exceeds the Offer Amount, the Company
     shall  select  the Notes to be  purchased  on a pro rata  basis  (with such
     adjustments as may be deemed  appropriate by the Company so that only Notes
     in  denominations  of  $1,000  or  integral  multiples  thereof,  shall  be
     purchased).  Holders whose Notes are purchased  only in part will be issued
     new Notes equal in principal amount to the unpurchased portion of the Notes
     surrendered.

          (iv) At the time the Company  delivers  Notes to the Trustee which are
     to be accepted  for  purchase,  the Company  will also deliver an Officers'
     Certificate  stating  that such  Notes are to be  accepted  by the  Company
     pursuant to and in  accordance  with the terms of this Section 3.10. A Note
     shall be deemed to have been accepted for purchase at the

                                       38





     time the Trustee, directly or through an agent, or the Company if acting as
     its own  Paying  Agent,  mails  or makes  available  for  delivery  payment
     therefor to the surrendering Holder.

          (d) In the event the Company is unable to purchase  Notes from Holders
     thereof in an Offer because such purchase is prohibited by any provision of
     applicable law, the Company need not make an Offer.  The Company shall then
     be  obligated  to use such Net Cash  Proceeds  in  accordance  with  clause
     (i)(B)(x) or (y) of this Section 3.10(c).

          (e) Whenever Net Cash Proceeds are received by the Company,  and prior
     to the allocation of such Net Cash Proceeds  pursuant to this Section 3.10,
     such Net Cash  Proceeds  shall be set aside by the  Company  in a  separate
     account pending allocation.

          The Company  will  comply  with all  applicable  tender  offer  rules,
     including  without  limitation  Rule  14e-1  under  the  Exchange  Act,  in
     connection with an Offer under the provisions of this covenant."

          SECTION 4.  Amendment  of Section 6.1 of the Original  Indenture.  (a)
     Clause (c) of Section 6.1 of the Original  Indenture  is hereby  amended by
     (i)  deleting  the word "30" in such clause (c) and  inserting in its place
     the word "60" and (ii) deleting the words "all series affected thereby" and
     inserting in its place the words "of such series".

          (b) Clause  (d) of Section  6.1 of the  Original  Indenture  is hereby
     amended by (i)  inserting  the word "(i)"  before the word  "relief",  (ii)
     deleting  the words "or  appointing"  and  inserting in its place the words
     "(ii) appointment of" and (iii) deleting the words "any substantial part of
     its  property or  ordering"  and  inserting  in its place the words "all or
     substantially all of the property and assets of the Company or (iii)".

          SECTION 5.  Amendment  of Section 6.2 of the Original  Indenture.  The
     second paragraph of clause (b) of Section 6.2 of the Original  Indenture is
     hereby amended by deleting the following words:

                  "all the then outstanding  Securities of such series that have
                  been accelerated (voting as a single class), by written notice
                  to the Company and to the Trustee, may waive all defaults with
                  respect  to all  such  series  (or  with  respect  to all  the
                  Securities, as the case may be) and rescind"

     and inserting in its place the following words:

                                       39




                  "all the then  outstanding  Securities  of any series that has
                  been  accelerated  (voting  as a separate  class),  by written
                  notice  to the  Company  and to the  Trustee,  may  waive  all
                  defaults with respect to such series and rescind"

          SECTION 6. Amendment of Section 4 of the First Supplemental Indenture.
     Section 4 of the First Supplemental  Indenture is hereby amended to read in
     its entirety as follows:

          "In addition to the Events of Default  described in Section 6.1 of the
     Original  Indenture,  an Event of Default  shall occur with  respect to the
     Notes if:

          (a) an event of default,  as defined in any  indenture  or  instrument
     evidencing or under which the Company or any Significant  Subsidiary has at
     the date of this Indenture or shall  hereafter have  outstanding  any Debt,
     shall happen and be continuing and either

          (i) such default results from the failure to pay the principal of such
     Debt in excess of $50 million at final maturity of such Debt or

          (ii) as a result of such default, the maturity of such Debt shall have
     been  accelerated so that the same shall be or become due and payable prior
     to the date on which the same would  otherwise have become due and payable,
     and such acceleration shall not be rescinded or annulled within 60 days and
     the principal  amount of such Debt,  together with the principal  amount of
     any other Debt of the Company or any Significant  Subsidiary in default, or
     the maturity of which has been accelerated, aggregates $50 million or more;
     provided that such default shall not be an Event of Default if such Debt is
     Debt of a Significant Subsidiary, is Non-Recourse to the Company in respect
     of the amounts not paid or due upon  acceleration and the Company could, at
     the time of default,  incur at least $1 of Debt under Section  3.3(a);  and
     provided,  further, however that, subject to the provisions of Sections 7.1
     and 7.2 of the Original  Indenture,  the Trustee  shall not be charged with
     knowledge of any such default unless written notice thereof shall have been
     given to the  Trustee  by the  Company,  by the  holder  or an agent of the
     holder of any such Debt,  by the trustee then acting under any indenture or
     other  instrument  under which such default shall have occurred,  or by the
     Holders of not less than 25% in the aggregate principal amount of the Notes
     at the time outstanding;

          (b) one or more  judgments  or  orders  shall  be  entered  by a court
     against the Company or any Significant  Subsidiary for the payment of money
     in an

                                       40




     amount  which,  individually  or  in  the  aggregate  exceeds  $50  million
     (excluding the amount thereof  covered by insurance or by a bond written by
     third parties but treating any deductibles, self insurance or retentions as
     not so covered by  insurance)  and which  judgments  or orders shall not be
     discharged or waived,  and shall remain  outstanding and there shall be any
     period of 60 consecutive  days following entry of such judgment or order in
     excess of $50 million or the judgment or order which  causes the  aggregate
     amount to exceed $50 million  during  which a stay of  enforcement  of such
     judgment or order, by reason of a pending appeal or otherwise, shall not be
     in effect; provided, that such a judgment or order shall not be an Event of
     Default if such judgment or order is against a Significant  Subsidiary  and
     does not require any payment by the Company and the Company  could,  at the
     expiration of the applicable 60 day period, incur at least $1 of Debt under
     Section 3.3;

          (c) a court having  jurisdiction  in the  premises  enters a decree or
     order for (i) relief in respect of any of the Material  Subsidiaries of the
     Company in an involuntary case under any applicable bankruptcy, insolvency,
     or other  similar law now or hereafter  in effect,  (ii)  appointment  of a
     receiver,  liquidator,   assignee,  custodian,  trustee,  sequestrator,  or
     similar official of the Company or any of the Material  Subsidiaries of the
     Company or for all or  substantially  all of the property and assets of any
     of the  Material  Subsidiaries  of the  Company or (iii) the  winding up or
     liquidation  of the  affairs  of any of the  Material  Subsidiaries  of the
     Company and such decree or order shall remain  unstayed and in effect for a
     period of 60 consecutive days; or

          (d) any of the Material  Subsidiaries  of the Company (i)  commences a
     voluntary  case  under  any  applicable  bankruptcy,  insolvency,  or other
     similar  law now or  hereafter  in effect,  or  consents to the entry of an
     order for relief in an  involuntary  case under any such law, (ii) consents
     to the  appointment  of or taking  possession  by a  receiver,  liquidator,
     assignee, custodian,  trustee,  sequestrator, or similar official of any of
     the Material Subsidiaries of the Company or for all or substantially all of
     the property and assets of any of the Material  Subsidiaries of the Company
     or (iii) effects any general assignment for the benefit of creditors."

          SECTION 7. Amendment of Section 5.1 of Original Indenture. Section 5.1
     of the  Original  Indenture  is hereby  amended to read in its  entirety as
     follows:

         "SECTION 5.1.  Merger, Consolidation, Etc.

          The  Company  shall  not  consolidate  with,  merge  with or into,  or
     transfer  all or  substantially  all  of its  assets  (as  an  entirety  or
     substantially  an  entirety  in one  transaction  or a  series  of  related
     transactions),  to  any  Person  unless:  (i)  the  Company  shall  be  the
     continuing Person, or the Person (if other than the

                                       41




     Company) formed by such  consolidation  or into which the Company is merged
     or to which properties and assets of the Company are transferred shall be a
     solvent  corporation  organized  and existing  under the laws of the United
     States or any State thereof or the District of Columbia and shall expressly
     assume in writing all  obligations  of the Company under the Securities and
     this Indenture; (ii) immediately after giving effect to such transaction no
     Event of Default or event or condition  which  through the giving of notice
     of lapse of time or both  would  become  an Event  of  Default  shall  have
     occurred and be continuing; and (iii) the Company or such Person shall have
     delivered  to the  Trustee  an  Officers'  Certificate  and an  Opinion  of
     Counsel, each stating that such consolidation, merger or transfer and, if a
     supplemental  indenture is required in  connection  with such  transaction,
     such supplemental  indenture,  comply with this provision of this Indenture
     and  that all  conditions  precedent  in this  Indenture  relating  to such
     transaction have been satisfied."

          SECTION 8.  Amendment  of Section 5 of First  Supplemental  Indenture.
     Section 5 of First Supplemental  Indenture is hereby amended to read in its
     entirety as follows:

         "SECTION 5.

          The Company  covenants and agrees with the Trustee that in addition to
     the  provisions  of Section  5.1 of the  Original  Indenture,  it shall not
     consolidate  with, merge with or into, or transfer all or substantially all
     of  its  assets  (as  an  entirety  or  substantially  an  entirety  in one
     transaction  or a series of related  transactions),  to any  Person  unless
     immediately  after giving effect to such  transaction on a pro forma basis,
     the Company or the  surviving  entity would be able to incur at least $1 of
     Debt under Section  3.3(a).  Notwithstanding  the foregoing,  the preceding
     sentence shall not prohibit a transaction,  the principal  purpose of which
     is (as determined in good faith by the Board of Directors as evidenced by a
     Board Resolution) to change the state of incorporation of the Company,  and
     such  transaction  does not have as one of its  purposes the evasion of the
     limitations  imposed  by  the  covenant  contained  in  Section  5.1 of the
     Original Indenture or the immediately preceding sentence."

          SECTION 9. Amendment of Section 8 of Original  Indenture.  Section 8.5
     through Section 8.6 of the Original  Indenture is hereby amended to read in
     its entirety as follows:

          "SECTION 8.5. Defeasance and Discharge of Indenture.

          The Company shall be deemed to have paid and shall be discharged  from
     any and all obligations in respect of the Securities of any series,

                                       42




     on the 123rd day after the  deposit  referred  to in clause  (A) hereof has
     been  made,  and the  provisions  of this  Indenture  shall no longer be in
     effect with respect to the  Securities of such series (and the Trustee,  at
     the expense of the Company, shall execute proper instruments  acknowledging
     the  same),  except as to:  (a)  rights of  registration  of  transfer  and
     exchange, and the Company'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  thereof and  interest
     thereon,  upon  the  original  stated  due  dates  therefor  (but  not upon
     acceleration),  (d) the rights,  obligations  and immunities of the Trustee
     hereunder  and (e) the  rights  of the  Securityholders  of such  series as
     beneficiaries  hereof with respect to the  property so  deposited  with the
     Trustee  payable  to all  or  any of  them;  provided  that  the  following
     conditions shall have been satisfied:

               (A) with reference to this provision the Company has deposited or
          caused  to be  irrevocably  deposited  with the  Trustee  (or  another
          trustee satisfying the requirements of Sections 7.8 and 7.10) as trust
          funds in trust,  specifically  pledged as security  for, and dedicated
          solely  to,  the  benefit of the  Holders  of the  Securities  of such
          series,  (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 will  provide not later than one day
          before  the due date of any  payment  referred  to in this  clause (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 certification thereof delivered to
          the  Trustee,  to  pay  and  discharge  without  consideration  of the
          reinvestment of such interest and after payment of all federal,  state
          and local taxes or other charges and  assessments  in respect  thereof
          payable by the Trustee (x) the principal of, premium, if any, and each
          installment of interest on the  outstanding  Securities of such series
          on the due dates thereof or earlier redemption  (irrevocably  provided
          for under arrangements  satisfactory to the Trustee),  as the case may
          be and (y) any mandatory  sinking fund payments or analogous  payments
          applicable  to the  Securities of such series on the day on which such
          payments  are  due  and  payable  in  accordance  with  the  terms  of
          Securities  of such  series  and the  Indenture  with  respect  to the
          Securities of such series;

               (B) the  Company has  delivered  to the Trustee (i) either (x) an
          Opinion of Counsel to the effect that  Holders of  Securities  of such
          series will not recognize income,  gain or loss for federal income tax
          purposes as a result of the  Company's  exercise  of its option  under
          this Section 8.5 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

                                       43




          must be based  upon a ruling of the  Internal  Revenue  Service to the
          same  effect  or a change  in  applicable  federal  income  tax law or
          related treasury regulations after the date of this Indenture or (y) a
          ruling  directed to the Trustee  received  from the  Internal  Revenue
          Service to the same  effect as the  aforementioned  Opinion of Counsel
          and (ii) an Opinion of Counsel to the effect that the  creation of the
          defeasance  trust does not violate the Investment  Company Act of 1940
          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  (other than a Default or Event
          of Default resulting from the borrowing of funds to be applied to such
          deposit)  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 Company is a party or
          by which the Company is bound;

               (D) the Company is not prohibited from making payments in respect
          of the Securities by Article 11 hereof; and

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

          SECTION 8.6 Defeasance of Certain Obligations.

          The Company may omit to comply with any term,  provision  or condition
     set forth in, and this  Indenture  will no longer be in effect with respect
     to, any  covenant  in Article 5 or any  covenants  established  pursuant to
     Section 2.3 in any indenture supplemental hereto and clauses (c) and (e) of
     Section 6.1 shall not be deemed to be an Event of Default, if

               (A) with reference to this Section 8.6, the Company has deposited
          or caused to be  irrevocably  deposited  with the  Trustee (or another
          trustee  satisfying the requirements of Section 7.8) as trust funds in
          trust,  specifically pledged as security for, and dedicated solely to,
          the  benefit of the Holders of the  Securities  of such series and the
          Indenture

                                       44




          with respect to the Securities of such series,  (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 will provide not later than one day before the due dates thereof
          or  earlier  redemption  (irrevocably  provided  for under  agreements
          satisfactory  to the  Trustee),  as the  case may be,  of any  payment
          referred  to in  this  clause  (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  certification  thereof  delivered to the Trustee,  to pay and
          discharge  without  consideration of the reinvestment of such interest
          and after  payment  of all  federal,  state  and local  taxes or other
          charges and  assessments in respect thereof payable by the Trustee the
          principal of, premium, if any, and each installment of interest on the
          outstanding  Securities on the due date thereof or earlier  redemption
          (irrevocably  provided  for  under  arrangements  satisfactory  to the
          Trustee),  as the  case  may be and (y)  any  mandatory  sinking  fund
          payments or analogous  payments  applicable to the  Securities of such
          series  on the day on  which  such  payments  are due and  payable  in
          accordance  with  the  terms  of  Securities  of such  series  and the
          Indenture with respect to the Securities of such series;

               (B) the  Company has  delivered  to the Trustee (i) an Opinion of
          Counsel to the effect that Holders of  Securities  of such series will
          not recognize income,  gain or loss for federal income tax purposes as
          a result of the  Company's  exercise of its option  under this Section
          8.6 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 and defeasance had not occurred and (ii) an Opinion of
          Counsel to the effect that the creation of the  defeasance  trust does
          not violate the  Investment  Company Act of 1940 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  (other than a Default or Event
          of Default resulting from the borrowing of funds to be applied to such
          deposit)  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

                                       45




          instrument  to which the Company is a party or by which the Company is
          bound;

               (D) the Company is not prohibited from making payments in respect
          of the Securities by Article 11 hereof; and

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

          SECTION 10. Amendment of Original Indenture.  This Second Supplemental
     Indenture  shall  form a part of the  Original  Indenture  as  supplemented
     hereby shall be bound hereby.  The Original  Indenture as  supplemented  by
     this Second  Supplemental  Indenture is hereby in all respects ratified and
     confirmed.

          SECTION 11.  Acceptance  by Trustee.  The Trustee,  for itself and its
     successor or  successors,  accepts the trust of the  Original  Indenture as
     amended by this Second  Supplemental  Indenture,  and agrees to perform the
     same,  but only  upon the terms and  conditions  set forth in the  Original
     Indenture,  including  the terms and  provisions  defining and limiting the
     liabilities and responsibilities of the Trustee, which terms and provisions
     shall in like manner define and limit its liabilities and  responsibilities
     in the  performance  of the trust created by the Original  Indenture,  and,
     without  limiting the generality of the foregoing,  the recitals  contained
     herein shall be taken as the  statements  of the  Company,  and the Trustee
     assumes no  responsibility  for their  correctness.  The  Trustee  makes no
     representations   as  to  the  validity  or   sufficiency  of  this  Second
     Supplemental  Indenture  other than as to the validity of its execution and
     delivery by the Trustee.

          SECTION 12.  Counterparts.  This Second Supplemental  Indenture may be
     executed in any number of counterparts, each of which shall be an original;
     but  such  counterparts  shall  together  constitute  but one and the  same
     instrument.

                                       46




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

                                              THE AES CORPORATION
                                               as the Company

                                              By /s/ Barry J. Sharp
                                             ----------------------
                                               Name: Barry J. Sharp
                                               Title: Vice President and Chief
                                                       Financial Office



                                              THE FIRST NATIONAL BANK
                                               OF CHICAGO
                                               as Trustee


                                              By /s/ Mary R. Fonti
                                             ---------------------
                                               Name: Mary R. Fonti
                                               Title: Assistant Vice President

                                       47