==================================



                               THE AES CORPORATION

                                       AND

                       THE FIRST NATIONAL BANK OF CHICAGO

                                   as Trustee


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



                          SECOND SUPPLEMENTAL INDENTURE

                          Dated as of October 29, 1997


                                       TO

                          JUNIOR SUBORDINATED INDENTURE


                            Dated as of March 1, 1997


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



                      5.50% Junior Subordinated Debentures
                                    Due 2012



                        ==================================






                                TABLE OF CONTENTS

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


                                                                                             PAGE
                                                                                             ----
                                            ARTICLE 1
                                            ---------
                   GENERAL TERMS AND CONDITIONS OF THE SERIES 5.50% DEBENTURES
                   -----------------------------------------------------------

                                                                                            
SECTION 1.01.  .................................................................................3
SECTION 1.02.  .................................................................................3
SECTION 1.03.  .................................................................................4
SECTION 1.04.  .................................................................................6

                                            ARTICLE 2
                                            ---------
                       OPTIONAL REDEMPTION OF THE SERIES 5.50% DEBENTURES
                       --------------------------------------------------

SECTION 2.01.  ................................................................................11
SECTION 2.02.  ................................................................................13
SECTION 2.03.  ................................................................................14

                                            ARTICLE 3
                                            ---------
                              EXTENSION OF INTEREST PAYMENT PERIOD
                              ------------------------------------

SECTION 3.01.  ................................................................................14
SECTION 3.02.  ................................................................................15
SECTION 3.03.  ................................................................................16

                                            ARTICLE 4
                                            ---------
                         COVENANTS APPLICABLE TO SERIES 5.50% DEBENTURES
                         -----------------------------------------------

SECTION 4.01.  ................................................................................16
SECTION 4.02.  ................................................................................16
SECTION 4.03.  ................................................................................16
SECTION 4.04.  ................................................................................16

                                            ARTICLE 5
                                            ---------
                                    CONVERSION OF DEBENTURES
                                    ------------------------

SECTION 5.01.  ................................................................................17
SECTION 5.02.  ................................................................................17
SECTION 5.03.  ................................................................................19
SECTION 5.04.  ................................................................................28
SECTION 5.05.  ................................................................................32






                                                                                             PAGE

SECTION 5.06.  ................................................................................33
SECTION 5.07.  ................................................................................34
SECTION 5.08.  ................................................................................34

                                            ARTICLE 6
                                            ---------
                                 FORM OF SERIES 5.50% DEBENTURES
                                 -------------------------------

SECTION 6.01.  ................................................................................35

                                            ARTICLE 7
                                            ---------
                            ORIGINAL ISSUE OF SERIES 5.50% DEBENTURES
                            -----------------------------------------

SECTION 7.01.  ................................................................................54

                                            ARTICLE 8
                                    MISCELLANEOUS PROVISIONS

SECTION 8.01.  ................................................................................54
SECTION 8.02.  ................................................................................54
SECTION 8.03.  ................................................................................54
SECTION 8.04.  ................................................................................55



                                       ii






         The Second Supplemental INDENTURE, dated as of the 29th day of October,
1997 (the  "SECOND  SUPPLEMENTAL  INDENTURE"),  between THE AES  CORPORATION,  a
corporation  duly organized and existing under the laws of the State of Delaware
(hereinafter sometimes referred to as the "COMPANY") and THE FIRST NATIONAL BANK
OF CHICAGO, a national banking association,  as trustee  (hereinafter  sometimes
referred to as the "TRUSTEE") under the Junior  Subordinated  Indenture dated as
of March 1, 1997 between the Company and the Trustee (the  "INDENTURE")  (except
as otherwise set forth herein, all terms used and not defined herein are used as
defined in the Indenture or in the Declaration of Trust);

         WHEREAS,  the Company  executed  and  delivered  the  Indenture  to the
Trustee to provide for the future issuance of its junior subordinated securities
(the "DEBENTURES"),  said Debentures to be issued from time to time in series as
might  be  determined  by the  Company  under  the  Indenture,  in an  unlimited
aggregate  principal amount which may be authenticated and delivered  thereunder
as in the Indenture provided; and

         WHEREAS, pursuant to the terms of the Indenture, the Company desires to
provide for the  establishment  of a new series of its Debentures to be known as
its 5.50% Junior Subordinated Debentures due 2012 (said series being hereinafter
referred to as the "SERIES  5.50%  DEBENTURES"),  the form and substance of such
Series 5.50% Debentures and the terms,  provisions and conditions  thereof to be
set forth as provided in the Indenture and this Second  Supplemental  Indenture;
and

         WHEREAS,  the  Company has caused to be formed AES Trust II ("AES TRUST
II" or the "TRUST") as a statutory  business  trust under the Business Trust Act
of the  State  of  Delaware  (12  Del.  Code ss.  3801 et  seq.)  pursuant  to a
declaration of trust dated November 1, 1996 (the "ORIGINAL DECLARATION") and the
filing of a restated  certificate  of trust with the  Secretary  of State of the
State of Delaware on March 27, 1997; and

         WHEREAS,  the Original Declaration is to be amended and restated in its
entirety  pursuant to an Amended and Restated  Declaration  of Trust dated as of
October 29, 1997 (such  Amended and Restated  Declaration  of Trust,  as amended
from time to time, the "DECLARATION OF TRUST"); and

         WHEREAS,  AES Trust II  desires  to issue its  $2.75  Term  Convertible
Securities,  Series A (the  "PREFERRED  SECURITIES"  or "TECONS")  and sell such
Preferred Securities to initial purchasers; and








         WHEREAS, in connection with such purchases of Preferred  Securities and
the related purchase by the Company of the Common  Securities (as defined in the
Declaration  of  Trust) of AES Trust  II,  AES Trust II will  purchase  as trust
assets Series 5.50% Debentures; and

         WHEREAS,  pursuant to the Declaration of Trust,  the legal title to the
Series  5.50%  Debentures  shall be owned  and held of record in the name of The
First National Bank of Chicago or its successor  under the Declaration of Trust,
as  Property  Trustee  (the  "PROPERTY  TRUSTEE"),  in trust for the  benefit of
holders of the Preferred Securities and the Common Securities; and

         WHEREAS,  upon the  occurrence  of a Special  Event (as  defined in the
Declaration  of Trust) the Regular  Trustees (as defined in the  Declaration  of
Trust) of AES Trust II shall, unless the Series 5.50% Debentures are redeemed as
described  herein,  dissolve  AES  Trust II and cause to be  distributed  to the
holders  of  Preferred  Securities  and Common  Securities,  on a Pro Rata basis
(determined  as provided  in the terms of the  Preferred  Securities  and Common
Securities  attached as Exhibits B and C to the  Declaration  of Trust),  Series
5.50% Debentures and, in connection with a Liquidation  Distribution (as defined
in the Declaration of Trust),  the Regular  Trustees may cause to be distributed
to holders of Preferred  Securities  and Common  Securities,  on such a Pro Rata
basis, Series 5.50% Debentures (each a "DISSOLUTION EVENT"); and

         WHEREAS, the Company desires and has requested the Trustee to join with
it in the execution and delivery of this Second Supplemental Indenture,  and all
requirements  necessary  to make  this  Second  Supplemental  Indenture  a valid
instrument,  in  accordance  with  its  terms,  and to  make  the  Series  5.50%
Debentures when executed by the Company and  authenticated  and delivered by the
Trustee,  the  valid  obligations  of  the  Company,  have  been  performed  and
fulfilled,  and the execution and delivery hereof have been in all respects duly
authorized;

         NOW THEREFORE,  in  consideration of the purchase and acceptance of the
Series 5.50% Debentures by the holders  thereof,  and for the purpose of setting
forth, as provided in the Indenture,  the form and substance of the Series 5.50%
Debentures  and the  terms,  provisions  and  conditions  thereof,  the  Company
covenants and agrees with the Trustee as follows:



                                       2




                                    ARTICLE 1
           GENERAL TERMS AND CONDITIONS OF THE SERIES 5.50% DEBENTURES

         SECTION  1.01.  There  shall be and is  hereby  authorized  a series of
Debentures  designated  the "5.50%  JUNIOR  SUBORDINATED  DEBENTURES  DUE 2012",
limited in aggregate  principal  amount to  $309,278,400  (except as provided in
this Section 1.01 and 7.01). Upon exercise of the overallotment option set forth
in the Purchase  Agreement (as defined in the Declaration of Trust),  additional
Series 5.50%  Debentures in the aggregate  principal amount of up to $46,391,800
may be executed by the Company and delivered to the Trustee for  authentication,
and the Trustee  shall  thereupon  authenticate  and deliver  said Series  5.50%
Debentures  to or upon the written  order of the  Company,  which order shall be
accompanied  by  evidence  satisfactory  to the Trustee  that the  overallotment
option has been  exercised.  The Series  5.50%  Debentures  shall mature and the
principal shall be due and payable together with all accrued and unpaid interest
thereon, including Compounded Interest (as hereinafter defined) on September 30,
2012 (the "MATURITY DATE").

         SECTION  1.02.  (a) Except as provided in Section  1.02(b),  the Series
5.50% Debentures shall be issued in fully registered  certificated  form without
interest  coupons  in  denominations  of  $50  or  integral  multiples  thereof.
Principal  and interest on the Series 5.50%  Debentures  issued in  certificated
form will be  payable,  the  transfer of such Series  5.50%  Debentures  will be
registrable and such Series 5.50%  Debentures  will be  exchangeable  for Series
5.50% Debentures  bearing identical terms and provisions at the office or agency
of the  Company  in the  Borough of  Manhattan,  The City and State of New York;
provided,  however,  that  payment of interest  may be made at the option of the
Company by check mailed to the registered holder at such address as shall appear
in the Debenture  register and that the payment of principal with respect to the
Series  5.50%  Debentures  will only be made upon  surrender of the Series 5.50%
Debentures  to the  Trustee.  Notwithstanding  the  foregoing,  so  long  as the
Property  Trustee  is the legal  owner and  record  holder of the  Series  5.50%
Debentures,  the payment of the principal of and interest (including  Compounded
Interest,  if any) on the Series 5.50%  Debentures held by the Property  Trustee
will be made by the Company in immediately  available  funds on the payment date
therefor  at  such  place  and  to  the  Property  Account  (as  defined  in the
Declaration  of  Trust)  established  and  maintained  by the  Property  Trustee
pursuant to the Declaration of Trust.

         (b) In connection with a Dissolution Event:

              (i) Series 5.50% Debentures in certificated  form may be presented
         to the  Trustee  by the  Property  Trustee  in  exchange  for a  Global
         Debenture representing the Series 5.50% Debentures in an aggregate




                                       3


         principal amount equal to all Outstanding  Series 5.50% Debentures,  to
         be  registered  in the  name of the  Depositary,  or its  nominee,  and
         delivered  by  the  Trustee  to the  Depositary  for  crediting  to the
         accounts  of  its  participants  pursuant  to the  instructions  of the
         Regular Trustees (as defined in the Declaration of Trust).  The Company
         upon  any  such   presentation   shall   execute  a  Global   Debenture
         representing  the Series 5.50%  Debentures in such aggregate  principal
         amount and  deliver  the same to the  Trustee  for  authentication  and
         delivery in accordance with the Indenture and this Second  Supplemental
         Indenture.  Payments on the Series 5.50% Debentures  issued as a Global
         Debenture will be made to the Depositary; and

              (ii)  if any  Preferred  Securities  are  held  in non  book-entry
         certificated  form, Series 5.50% Debentures in certificated form may be
         presented  to the Trustee by the  Property  Trustee  and any  Preferred
         Security  Certificate  (as defined in the  Declaration  of Trust) which
         represents Preferred Securities other than Preferred Securities held by
         the  Clearing  Agency (as defined in the  Declaration  of Trust) or its
         nominee  ("NON  BOOK-ENTRY  PREFERRED  SECURITIES")  will be  deemed to
         represent  beneficial interests in Series 5.50% Debentures presented to
         the  Trustee by the  Property  Trustee  having an  aggregate  principal
         amount equal to the aggregate  liquidation amount of the Non Book-Entry
         Preferred  Securities  until such Preferred  Security  Certificate  are
         presented to the  Debenture  Registrar  for transfer or  reissuance  at
         which time such Preferred  Security  Certificate will be canceled and a
         Series  5.50%  Debenture,  registered  in the name of the holder of the
         Preferred Security  Certificate or the transferee of the holder of such
         Preferred Security  Certificate,  as the case may be, with an aggregate
         principal  amount  equal to the  aggregate  liquidation  amount  of the
         Preferred Security Certificate canceled will be executed by the Company
         and  delivered  to the  Trustee  for  authentication  and  delivery  in
         accordance with the Indenture and this Second  Supplemental  Indenture.
         On issue of such Series 5.50% Debentures,  Series 5.50% Debentures with
         an  equivalent  aggregate  amount that were  presented  by the Property
         Trustee to the Trustee will be deemed to have been canceled.

         SECTION  1.03.  Each Series 5.50%  Debenture  will bear interest at the
rate of 5.50% per annum  from  October  29,  1997  until the  principal  thereof
becomes due and payable,  and on any overdue  principal  and (to the extent that
payment of such interest is  enforceable  under  applicable  law) on any overdue
installment  of  interest  at the same  rate per  annum,  compounded  quarterly,
payable (subject to the provisions of Article Three) quarterly in arrears on the
last day of each calendar quarter (each an "INTEREST  PAYMENT DATE",  commencing
on December 31, 1997),




                                       4


to the person in whose  name such  Series  5.50%  Debenture  or any  predecessor
Series 5.50%  Debenture is  registered,  at the close of business on the regular
record date for such  interest  installment,  which,  except as set forth below,
shall be, in  respect  of any  Series  5.50%  Debentures  of which the  Property
Trustee is the registered holder of or a Global Debenture, the close of business
on the business day next preceding that Interest  Payment Date.  Notwithstanding
the foregoing sentence,  if the Preferred Securities are no longer in book-entry
only form or if pursuant to the  provisions of Section  2.11(c) of the Indenture
the Series 5.50%  Debentures  are not  represented  by a Global  Debenture,  the
regular  record  dates  for such  interest  installment  shall  be the  close of
business on the fifteenth  day of the month in which that Interest  Payment Date
occurs.  Any such interest  installment not punctually paid or duly provided for
shall  forthwith  cease to be payable to the registered  holders on such regular
record  date,  and may be paid to the  person  in whose  name the  Series  5.50%
Debenture (or one or more Predecessor  Debentures) is registered at the close of
business on a special  record date to be fixed by the Trustee for the payment of
such defaulted interest, notice whereof shall be given to the registered holders
of the  Series  5.50%  Debentures  not less than 10 days  prior to such  special
record  date,  or may be  paid  at any  time  in any  other  lawful  manner  not
inconsistent  with the  requirements  of any  securities  exchange  on which the
Series 5.50%  Debentures may be listed,  and upon such notice as may be required
by such exchange, all as more fully provided in the Indenture.

         The amount of  interest  payable for any period will be computed on the
basis of a 360-day year of twelve 30-day  months.  In the event that any date on
which interest is payable on the Series 5.50%  Debentures is not a business day,
then  payment  of  interest  payable  on such  date  will  be  made on the  next
succeeding  day which is a  business  day (and  without  any  interest  or other
payment in respect of any such delay),  except that,  if such business day is in
the next succeeding calendar year, such payment shall be made on the immediately
preceding  business  day, in each case with the same force and effect as if made
on such date.

         If at any time AES Trust II shall be required to pay any taxes, duties,
assessments or governmental  charges of whatever nature (other than  withholding
taxes)  imposed by the U.S.,  or any other taxing  authority,  then, in any such
case, the Company will pay as additional interest ("ADDITIONAL INTEREST") on the
Series 5.50% Debentures such additional amounts as shall be required so that the
net amounts  received  and retained by AES Trust II after paying any such taxes,
duties,  assessments or other governmental  charges will be equal to the amounts
AES Trust II would have  received  had no such taxes,  duties,  assessments,  or
other governmental charges been imposed.

         SECTION  1.04.  If  distributed  to holders of Preferred  Securities in
connection with a Dissolution  Event, the Series 5.50% Debentures will be issued




                                       5


to such holders in the same form as the  Preferred  Securities  that such Series
5.50% Debentures replace in accordance with the following procedures:

         So  long  as  Series  5.50%  Debentures  are  eligible  for  book-entry
settlement with the Depositary,  or unless otherwise required by law, all Series
5.50%  Debentures  that are so eligible may be represented by one or more Series
5.50%  Debentures in global form registered in the name of the Depositary or the
nominee of the Depositary, except as otherwise specified below. The transfer and
exchange of  beneficial  interests in any such Series 5.50%  Debenture in global
form shall be effected  through the Depositary in accordance with this Indenture
and the procedures of the Depositary therefor.

         Series   5.50%   Debentures   that  are   distributed   to   "qualified
institutional  buyers"  within  the  meaning  of Rule  144A  ("QIBs")  under the
Securities Act of 1933, as amended (the  "Securities  Act") or to  institutional
"accredited  investors"  as defined in Rule  501(a)(1),(2),(3)  or (7)  ("IAIs")
under the Securities Act in replacement of Preferred Securities represented by a
global Preferred Security will be represented by one or more global Series 5.50%
Debentures  (the "144A  GLOBAL  DEBENTURE").  Series 5.50%  Debentures  that are
distributed  to  Non-U.S.   Persons  in  replacement  of  Preferred   Securities
represented  by a global  Preferred  Security will be represented by one or more
global Series 5.50% Debenture (the "REGULATION S GLOBAL DEBENTURE"). Each of the
144A Global Debenture and the Regulation S Global Debenture shall be referred to
herein as a Global  Debenture.  Series 5.50%  Debentures that are distributed to
QIBs,  IAIs  or  Non-U.S.  Persons  in  replacement  of  Certificated  Preferred
Securities  will be  represented  by definitive  Series 5.50%  Debentures as set
forth in this  Section  1.04.  If Global  Debentures  are issued,  transfers  of
interests in the Series 5.50%  Debentures  between the 144A Global Debenture and
the Regulation S Global  Debenture will be made in accordance  with the standing
instructions  and  procedures of the  Depositary  and its  participants  and the
Trustee shall make appropriate endorsements to reflect increases or decreases in
the principal amounts of such Global Debentures to reflect any such transfers.

         Except as provided below, beneficial owners of a Series 5.50% Debenture
in global form shall not be entitled to have  certificates  registered  in their
names,  will  not  receive  or be  entitled  to  receive  physical  delivery  of
certificates  in  definitive  form and will not be  considered  Holders  of such
Series 5.50% Debentures in global form.

              (i) Preferred  Securities  held in certificated  form,  except for
         certificates  representing  Preferred Securities held by the Depositary
         or its nominee (or any successor Clearing Agency or its nominee), shall
         upon  presentation  to the  Trustee by the  Property  Trustee or by the
         holder thereof



                                       6


         or by the Property Trustee on behalf of such holders shall be exchanged
         for Series 5.50%  Debentures in fully registered  certificated  form of
         like aggregate principal amount and tenor.

         So long as the Series 5.50%  Debentures  are  eligible  for  book-entry
settlement,  and to the extent that Series 5.50%  Debentures are held by QIBs or
Non-U.S. Persons, as the case may be, in a Global Debenture, or unless otherwise
required by law, upon any transfer of a definitive  Series 5.50%  Debenture to a
QIB in  accordance  with Rule 144A or to a Non-U.S.  Person in  accordance  with
Regulation S, unless otherwise requested by the transferor,  and upon receipt of
the  definitive  Series 5.50%  Debentures  or Series 5.50%  Debentures  being so
transferred, together with a certification from the transferor that the transfer
is being made in  compliance  with Rule 144A or Regulation S, as the case may be
(or other  evidence  satisfactory  to the  Trustee),  the Trustee  shall make an
endorsement on any 144A Global  Debenture or any Regulation S Global  Debenture,
as the case may be, to reflect an increase in the aggregate  principal amount of
the Series  5.50%  Debentures  represented  by such  Global  Debenture,  and the
Trustee  shall cancel such  definitive  Series  5.50%  Debenture or Series 5.50%
Debentures in accordance  with the standing  instructions  and procedures of the
Depositary,   the  aggregate   principal   amount  of  Series  5.50%  Debentures
represented by such Global Debenture to be increased accordingly;  provided that
no definitive  Series 5.50% Debenture,  or portion thereof,  in respect of which
the Company or an Affiliate of the Company held any beneficial interest shall be
included in such Global  Debenture until such definitive  Series 5.50% Debenture
is freely  tradable in accordance  with Rule 144(k);  provided  further that the
Trustee  shall,  at the  written  request of the  Company,  issue  Series  5.50%
Debentures in definitive form upon any transfer of a beneficial  interest in the
Global Debenture to the Company or any Affiliate of the Company.

         Any Global  Debenture may be endorsed with or have  incorporated in the
text  thereof  such  legends or recitals or changes  not  inconsistent  with the
provisions  of this  Indenture  as may be  required  by the  Depositary,  by the
National  Association of Securities Dealers,  Inc. in order for the Series 5.50%
Debentures  to be tradeable  on the PORTAL  Market or as may be required for the
Series  5.50%  Debentures  to be tradeable  on any other  market  developed  for
trading of  securities  pursuant  to Rule 144A or  required  to comply  with any
applicable law or any regulation thereunder or with the rules and regulations of
any securities  exchange upon which the Series 5.50% Debentures may be listed or
traded or to conform  with any usage with  respect  thereto,  or to indicate any
special  limitations  or  restrictions  to which  any  particular  Series  5.50%
Debentures are subject.

         Each  Debenture  that bears or is required to bear the legend set forth
in  this  Section  1.04  (a  "RESTRICTED  SECURITY")  shall  be  subject  to the
restrictions on




                                       7


transfer  provided  in the legend set forth in this  Section  1.04,  unless such
restrictions  on transfer shall be waived by the written consent of the Company,
and the Holder of each Restricted Security, by such securityholder's  acceptance
thereof,  agrees to be bound by such  restrictions on transfer.  As used in this
Section 1.04, the terms  "transfer"  encompasses any sale,  pledge,  transfer or
other disposition of any Restricted Security.

         Prior to the Transfer  Restriction  Termination Date (as defined in the
Declaration of Trust),  any  certificate  evidencing a Series 5.50% Debenture or
Common  Stock  issued  upon the  conversion  or  exchange  of any  Series  5.50%
Debenture  shall  bear a legend in  substantially  the  following  form,  unless
otherwise agreed by the Company (with written notice thereof to the Trustee):

         THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE U.S.  SECURITIES ACT OF
         1933, AS AMENDED (THE "SECURITIES ACT"), AND,  ACCORDINGLY,  MAY NOT BE
         OFFERED OR SOLD EXCEPT AS SET FORTH IN THE FOLLOWING  SENTENCE.  BY ITS
         ACQUISITION  HEREOF,  THE  HOLDER  (1)  REPRESENTS  THAT  (A)  IT  IS A
         "QUALIFIED  INSTITUTIONAL  BUYER"  (AS  DEFINED  IN RULE 144A UNDER THE
         SECURITIES  ACT), (B) IT IS AN INSTITUTIONAL  "ACCREDITED  INVESTOR" IN
         RULE  501(a)(1),   (2),  (3)  OR  (7)  UNDER  THE  SECURITIES  ACT  (AN
         "INSTITUTIONAL  ACCREDITED INVESTOR")),  OR (C) IT IS NOT A U.S. PERSON
         AND IS ACQUIRING  THIS SECURITY IN AN OFFSHORE  TRANSACTION  (2) AGREES
         THAT  IT  WILL  NOT  PRIOR  TO THE  EXPIRATION  OF THE  HOLDING  PERIOD
         APPLICABLE TO SALES OF THE SECURITY  EVIDENCED HEREBY UNDER RULE 144(k)
         UNDER  THE  SECURITIES  ACT (OR ANY  SUCCESSOR  PROVISION),  RESELL  OR
         OTHERWISE  TRANSFER THIS SECURITY  EXCEPT (A) TO AES OR ANY  SUBSIDIARY
         THEREOF,  (B)  INSIDE THE UNITED  STATES TO A  QUALIFIED  INSTITUTIONAL
         BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE
         THE UNITED STATES TO AN INSTITUTIONAL  ACCREDITED INVESTOR THAT, BEFORE
         SUCH TRANSFER  FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN
         REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER
         OF THIS  SECURITY  (THE FORM OF WHICH  LETTER CAN BE OBTAINED  FROM THE
         TRUSTEE) AND IF SUCH  TRANSFER IS IN RESPECT OF AN AGGREGATE  PRINCIPAL
         AMOUNT OF SECURITIES




                                       8


         LESS THAN $250,000,  AN OPINION OF COUNSEL ACCEPTABLE TO THE TRUST THAT
         SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE
         UNITED STATES IN AN OFFSHORE  TRANSACTION  IN COMPLIANCE  WITH RULE 904
         UNDER  THE   SECURITIES   ACT,  (E)  PURSUANT  TO  THE  EXEMPTION  FROM
         REGISTRATION  PROVIDED  BY  RULE  144  UNDER  THE  SECURITIES  ACT  (IF
         AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER
         THE  SECURITIES  ACT AND (3) AGREES THAT IT WILL DELIVER TO EACH PERSON
         TO WHOM THIS  SECURITY IS  TRANSFERRED  A NOTICE  SUBSTANTIALLY  TO THE
         EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY
         PRIOR TO THE EXPIRATION DATE OF THE HOLDING PERIOD  APPLICABLE TO SALES
         OF THE SECURITY EVIDENCED HEREBY UNDER RULE 144(k) UNDER THE SECURITIES
         ACT (OR  ANY  SUCCESSOR  PROVISION),  THE  TRANSFEROR  MUST  CHECK  THE
         APPROPRIATE  BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER
         OF SUCH TRANSFER AND SUBMIT THIS  CERTIFICATE TO THE PROPERTY  TRUSTEE.
         IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR, THE
         TRANSFEROR  MUST,  BEFORE  SUCH  TRANSFER,  FURNISH TO THE ISSUER  SUCH
         CERTIFICATIONS,   LEGAL  OPINIONS  OR  OTHER   INFORMATION  AS  IT  MAY
         REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT
         TO  AN  EXEMPTION  FROM  OR  IN  A  TRANSACTION  NOT  SUBJECT  TO,  THE
         REGISTRATION  REQUIREMENTS OF THE SECURITIES  ACT. AS USED HEREIN,  THE
         TERMS "OFFSHORE  TRANSACTION",  "UNITED STATES" AND "U.S.  PERSON" HAVE
         THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

         Following the Transfer  Restriction  Termination  Date or the sale of a
Debenture or Common Stock issued upon the  conversion or exchange of a Debenture
pursuant to an effective  registration  statement or Rule 144 (or any  successor
provision)  under the  Securities  Act,  any  Debenture  or  security  issued in
exchange  or  substitution  therefor  (other  than (i) Series  5.50%  Debentures
acquired by the  Company or any  Affiliate  thereof  since the issue date of the
Preferred  Securities  and (ii)  Common  Stock  issued  upon the  conversion  or
exchange of any



                                       9


Debenture  described in clause (i) above) may upon  surrender of such  Debenture
for exchange to the  Debenture  Registrar in accordance  with the  provisions of
this Section 1.04, be exchanged for a new Debenture or Series 5.50%  Debentures,
of like  tenor  and  aggregate  principal  amount,  which  shall  not  bear  the
restrictive legend required by this Section 1.04.

         Notwithstanding  any other  provisions of the Indenture (other than the
provisions  set  forth in this  Section  1.04),  a Global  Debenture  may not be
transferred  as a whole except by the  Depositary to a nominee of the Depositary
or by a nominee of the  Depositary  to the  Depositary  or another  nominee to a
successor Depositary or a nominee of such successor Depositary.

         The Depositary shall be a clearing agency registered under the Exchange
Act. The Company  initially  appoints  The  Depository  Trust  Company to act as
Depositary  with  respect  to  the  Series  5.50%  Debentures  in  global  form.
Initially,  the Global Debentures shall be issued to the Depositary,  registered
in the name of Cede & Co., as the nominee of the Depositary,  and deposited with
the Trustee as custodian for Cede & Co.

         If at any time the  Depositary for the Global  Debentures  notifies the
Company that it is unwilling or unable to continue as Depositary for such Series
5.50% Debentures, the Company may appoint a successor Depositary with respect to
such Series 5.50%  Debentures.  If a successor  Depositary  for the Series 5.50%
Debentures  is not  appointed  by the  Company  within 90 days after the Company
receives such notice, the Company will execute, and the Trustee, upon receipt of
an  Officers'  Certificate  for  authentication  and  delivery  of Series  5.50%
Debentures, will authenticate and deliver, Series 5.50% Debentures in definitive
form,  in an aggregate  principal  amount equal to the  principal  amount of the
Global Debentures, in exchange for such Global Debentures.

         Definitive Series 5.50% Debentures issued in exchange for all or a part
of a Global Debenture  pursuant to this Section 1.04 shall be registered in such
names  and in such  authorized  denominations  as the  Depositary,  pursuant  to
instructions  from its  direct or  indirect  participants  or  otherwise,  shall
instruct the Trustee.  Upon  execution  and  authentication,  the Trustee  shall
deliver such  definitive  Series 5.50%  Debentures  to the person in whose names
such definitive Series 5.50% Debentures are so registered.

         At such time as all interests in a Global Debenture have been redeemed,
converted,  exchanged,  repurchased or canceled, such Global Debenture shall be,
upon  receipt  thereof,  canceled by the  Trustee in  accordance  with  standing
procedures  and  instructions  of the  Depositary.  At any  time  prior  to such
cancellation, if any interest in a Global Debenture is exchanged for definitive



                                       10


Series  5.50%  Debentures,  redeemed  by the  Company  pursuant  to Article 2 or
canceled, or transferred for part of a Global Debenture, the principal amount of
such Global  Debenture  shall,  in accordance  with the standing  procedures and
instructions of the Depositary be reduced or increased,  as the case may be, and
an  endorsement  shall be made on such Global  Debenture by, or at the direction
of, the Trustee to reflect such reduction or increase. Following such redemption
by the  Company or  cancellation,  or  transfer,  the Company  will  execute and
Trustee will  authenticate and make available for delivery to the transferee (or
such transferee's  nominee, as the case may be), a Series 5.50% Debenture in the
appropriate  aggregate  principal amount and bearing such restrictive legends as
may be required by this Indenture.

         Any Series 5.50%  Debenture or Common Stock issued upon the  conversion
or exchange of a Series 5.50% Debenture that, prior to the Transfer  Restriction
Termination  Date, is purchased or owned by the Company or any Affiliate thereof
may not be resold by the Company or such Affiliate  unless  registered under the
Securities  Act  or  resold  pursuant  to an  exemption  from  the  registration
requirements of the Securities Act in a transaction which results in such Series
5.50%  Debentures  or  Common  Stock,  as the  case  may  be,  no  longer  being
"restricted securities" (as defined under Rule 144).



                                    ARTICLE 2
               OPTIONAL REDEMPTION OF THE SERIES 5.50% DEBENTURES

         SECTION  2.01.  Except as provided  in Section  2.02 and subject to the
provisions  below,  Series 5.50%  Debentures  may not be redeemed by the Company
prior to  September  30,  2000.  Subject  to the terms of  Article  Three of the
Indenture,  the  Company  shall  have  the  right to  redeem  the  Series  5.50%
Debentures,  in whole or in part,  from time to time, on or after  September 30,
2000,  upon not less than 30 nor more than 60 days  notice to the  Holder of the
Series 5.50%  Debentures,  at the following prices  (expressed as percentages of
the principal amount of the Series 5.50%  Debentures) (the "OPTIONAL  REDEMPTION
PRICE"),  together  with any  accrued  and unpaid  interest  thereon,  including
Compounded Interest (as defined herein), if any, to, but excluding,  the date of
such redemption, if redeemed during the 12-month period beginning September 30.




                                       11




                          YEAR            REDEMPTION PRICE
                          ----            ----------------
                          2000                 103.438%
                          2001                 102.750%
                          2002                 102.063%
                          2003                 101.375%
                          2004                 100.688%

and 100% if redeemed on or after September 30, 2005.

         If the Series 5.50%  Debentures  are  redeemed on any Interest  Payment
Date,  accrued and unpaid  interest shall be payable to Holders of record on the
relevant record date.

         The  Company  may not  redeem  any Series  5.50%  Debenture  unless all
accrued and unpaid interest thereon,  including Compounded Interest, if any, has
been  paid  for all  quarterly  periods  terminating  on or prior to the date of
notice  of  redemption.  So  long  as the  corresponding  Trust  Securities  are
outstanding,  the proceeds from the  redemption  of the Series 5.50%  Debentures
will be used to redeem the Trust Securities.

         If the  Company  gives a notice  of  redemption  in  respect  of Junior
Subordinated Debentures (which notice will be irrevocable), then, by 12:00 noon,
New York City time, on the redemption date, the Company will deposit irrevocably
with the Indenture  Trustee funds  sufficient to pay the  applicable  Redemption
Price  and  will  give  irrevocable  instructions  and  authority  to  pay  such
Redemption Price to the holders of the Junior Subordinated Debentures.

         If any date fixed for redemption of Junior  Subordinated  Debentures is
not a Business  Day, then payment of the  Redemption  Price payable on such date
will be made on the next  succeeding day that is a Business Day (and without any
interest or other  payment in respect of any such delay)  except  that,  if such
Business Day falls in the next calender  year,  such payment will be made on the
immediately  preceding Business Day, in each case with the same force and effect
as if made on such date fixed for redemption.

         In the  event of any  redemption  in part,  the  Company  shall  not be
required  to  (i)  issue,  register  the  transfer  of or  exchange  any  Junior
Subordinated  Debentures during a period beginning at the opening of business 15
days before any selection for redemption of Junior  Subordinated  Debentures and
ending at the  close of  business  on the  earliest  date on which the  relevant
notice of  redemption  is deemed to have  been  given to all  holders  of Junior
Subordinated  Debentures  to be redeemed  and (ii)  register  the transfer of or
exchange any Junior Subordinated



                                       12




Debentures  so  selected  for  redemption,  in  whole  or in  part,  except  the
unredeemed portion of any Junior Subordinated Debentures being redeemed in part.

         SECTION  2.02.  If, at any time,  a Tax Event (as defined  below) shall
occur or be continuing  and (i) the Regular  Trustees and the Company shall have
received an opinion (a  "REDEMPTION  TAX  OPINION") of a  nationally  recognized
independent  tax counsel  experienced in such matters that, as a result of a Tax
Event,  there is more  than an  insubstantial  risk  that the  Company  would be
precluded from deducting the interest on the Series 5.50%  Debentures for United
States  federal  income tax purposes  even if the Series 5.50%  Debentures  were
distributed  to the holders of Preferred  Securities  and Common  Securities  in
liquidation  of such  holder's  interest  in AES  Trust  II as set  forth in the
Declaration  of Trust or (ii) the Regular  Trustees  shall have been informed by
such tax counsel  that a No  Recognition  Opinion (as defined  below)  cannot be
delivered  to AES Trust II, the Company  shall have the right at any time,  upon
not less  than 30 nor more than 60 days'  notice,  to redeem  the  Series  5.50%
Debentures  in  whole  or in  part  for  cash at a  price  equal  to 100% of the
principal amount thereof, together with any accrued and unpaid interest thereon,
including Compounded Interest, if any, to, but excluding the date of redemption,
within 90 days  following the occurrence of such Tax Event;  provided,  however,
that,  if at the time there is available to the Company or the Regular  Trustees
on behalf of AES  Trust II the  opportunity  to  eliminate,  within  such 90 day
period, the Tax Event by taking some ministerial action ("MINISTERIAL  ACTION"),
such as filing a form or making an  election,  or  pursuing  some other  similar
reasonable measure,  which has no adverse effect on AES Trust II, the Company or
the holders of the Preferred Securities,  the Company or the Regular Trustees on
behalf  of AES Trust II will  pursue  such  measure  in lieu of  redemption  and
provided further that the Company shall have no right to redeem the Series 5.50%
Debentures while the Regular Trustees on behalf of AES Trust II are pursuing any
such Ministerial Action.

         "TAX EVENT" means that the Company and the Regular  Trustees shall have
obtained an opinion of nationally recognized independent tax counsel experienced
in such  matters (a  "DISSOLUTION  TAX  OPINION") to the effect that on or after
October 23, 1997 as a result of (a) any amendment to, or change in, the laws (or
any regulations thereunder) of the United States or any political subdivision or
taxing  authority  thereof or therein,  (b) any  amendment  to, or change in, an
interpretation or application of any such laws or regulations by any legislative
body,  court,   governmental  agency  or  regulatory  authority  (including  the
enactment of any  legislation  and the  publication of any judicial  decision or
regulatory determination), (c) any interpretation or pronouncement that provides
for a position  with respect to such laws or  regulations  that differs from the
theretofore  generally  accepted  position  or  (d)  any  action  taken  by  any
governmental  agency  or  regulatory  authority,  which  amendment  or change is
enacted, promulgated, issued



                                       13


or effective or which  interpretation or pronouncement is issued or announced or
which action is taken,  in each case on or after  October 23, 1997 there is more
than an  insubstantial  risk that (i) AES Trust II is, or will be within 90 days
of the date thereof, subject to United States federal income tax with respect to
income accrued or received on the Series 5.50% Debentures, (ii) AES Trust II is,
or will be within 90 days of the date thereof, subject to more than a de minimis
amount of taxes, duties or other governmental  charges or (iii) interest payable
by the Company to AES Trust II on the Series 5.50%  Debentures is not, or within
90 days of the date  thereof will not be,  deductible  by the Company for United
States federal income tax purposes.

         "NO  RECOGNITION  OPINION" means an opinion of a nationally  recognized
independent tax counsel  experienced in such matters,  which opinion may rely on
any then applicable published revenue ruling of the Internal Revenue Service, to
the effect that the holders of the Preferred  Securities  will not recognize any
gain or loss for United  States  federal  income tax  purposes  as a result of a
dissolution of AES Trust II and  distribution of the Series 5.50%  Debentures as
provided in the Declaration of Trust.

         SECTION  2.03.  If the  Series  5.50%  Debentures  are  only  partially
redeemed  pursuant to this  Article Two,  the Series  5.50%  Debentures  will be
redeemed  pro rata or by lot or by any other  method  utilized  by the  Trustee,
provided  that if at the time of  redemption,  the Series 5.50%  Debentures  are
registered as a Global  Debenture,  the  Depository  shall  determine by lot the
principal  amount of such Series 5.50%  Debentures held by each Debenture Holder
to be redeemed in accordance with its customary procedures.  Notwithstanding the
foregoing,  if a partial  redemption of the Series 5.50% Debentures would result
in the delisting of the Preferred Securities by any national securities exchange
or other  organization  on which the Preferred  Securities are then listed,  the
Company shall not be permitted to effect such partial  redemption  and will only
redeem the Series 5.50% Debentures in whole.


                                    ARTICLE 3
                      EXTENSION OF INTEREST PAYMENT PERIOD

         SECTION  3.01.  So long as the Company is not in default in the payment
of interest on the Series 5.50% Debentures, the Company shall have the right, at
any time during the term of the Series  5.50%  Debentures,  from time to time to
extend the interest  payment period of such Series 5.50% Debentures for up to 20
consecutive quarterly interest periods (the "EXTENDED INTEREST PAYMENT PERIOD"),
at the end of which period the Company shall pay all interest accrued



                                       14


and unpaid  thereon  (together  with  interest  thereon at the rate of 5.50% per
annum  to  the  extent  permitted  by  applicable  law,   compounded   quarterly
("COMPOUNDED INTEREST"));  provided that no Extended Interest Payment Period may
extend  beyond  the  Maturity  Date  or  redemption  date  of the  Series  5.50%
Debentures.  During such Extended  Interest Payment Period the Company shall not
declare  or pay  any  dividend  on,  or  redeem,  purchase,  acquire  or  make a
distribution or liquidation  payment with respect to, any of its common stock or
preferred stock or make any guarantee  payments with respect  thereto;  provided
that the foregoing will not apply to any stock  dividends paid by the Company in
Common Stock.  Prior to the  termination of any such Extended  Interest  Payment
Period,  the Company may pay all or any portion of the  interest  accrued on the
Series 5.50% Debentures on any Interest Payment Date to holders of record on the
regular record date for such Interest  Payment Date or from time to time further
extend such Period;  provided  that such Period  together  with all such further
extensions  thereof shall not exceed 20 consecutive  quarterly interest periods.
Upon the  termination  of any  Extended  Interest  Payment  Period  and upon the
payment of all accrued and unpaid  interest then due,  together with  Compounded
Interest, the Company may select a new Extended Interest Payment Period, subject
to the foregoing  requirements.  No interest  shall be due and payable during an
Extended Interest Payment Period,  except at the end thereof.  At the end of the
Extended  Interest Payment Period the Company shall pay all interest accrued and
unpaid on the Series 5.50%  Debentures  including any Compounded  Interest which
shall be payable to the holders of the Series  5.50%  Debentures  in whose names
the Series 5.50%  Debentures  are  registered in the  Debenture  register on the
first record date after the end of the Extended Interest Payment Period.

         SECTION  3.02.  (a) So long as the Property  Trustee is the legal owner
and holder of record of the Series  5.50%  Debentures,  at the time the  Company
selects an Extended  Interest  Payment  Period,  the Company shall give both the
Property  Trustee  and the  Trustee  written  notice  of its  selection  of such
Extended  Interest  Payment  Period one business day prior to the earlier of (i)
the next succeeding date on which distributions on the Preferred  Securities are
payable or (ii) the date AES Trust II is  required  to give notice of the record
date or the date such  distributions  are  payable to  holders of the  Preferred
Securities, but in any event not less than one business day prior to such record
date.  The  Company  shall  cause AES Trust II to give  notice of the  Company's
selection  of such  Extended  Interest  Payment  Period  to the  holders  of the
Preferred Securities.

         (b) If as a result of a Dissolution  Event Series 5.50% Debentures have
been distributed to holders of Preferred  Securities and Common  Securities,  at
the time the Company selects an Extended  Interest  Payment Period,  the Company
shall give the holders of the Series 5.50%  Debentures  and the Trustee  written
notice of its selection of such Extended Interest Payment Period at least 10



                                       15


business days prior to the earlier of (i) the next succeeding  Interest  Payment
Date or (ii) the date the  Company is  required  to give notice of the record or
payment date of such  interest  payment to the New York Stock  Exchange or other
applicable  self-regulatory  organization  or to  holders  of the  Series  5.50%
Debentures.

         SECTION  3.03.  The  quarter in which any notice is given  pursuant  to
Section  3.02 shall be counted as one of the  quarters  permitted in the maximum
Extended Interest Payment Period permitted under this Article Three.


                                    ARTICLE 4
                 COVENANTS APPLICABLE TO SERIES 5.50% DEBENTURES

         SECTION 4.01. So long as any Preferred  Securities remain  outstanding,
the  Company  will not  declare or pay any  dividends  on, or redeem,  purchase,
acquire or make a distribution  or  liquidation  payment with respect to, any of
its common stock or preferred stock or make any guarantee  payments with respect
thereto if at such time (i) the Company  shall be in default with respect to its
Guarantee  Payments (as defined in the  Guarantee  Agreement)  or other  payment
obligations  under the Guarantee  Agreement,  (ii) there shall have occurred any
Event of Default under the Indenture with respect to the Series 5.50% Debentures
or (iii) the  Company  shall have given  notice of its  election  of an Extended
Interest  Payment  Period  and  such  Period,  or  any  extension  thereof,   is
continuing;  provided that the foregoing  will not apply to any stock  dividends
paid by the Company in Common Stock.

         SECTION 4.02. In connection  with the  distribution of the Series 5.50%
Debentures to the holders of the Preferred  Securities upon a Dissolution Event,
the Company will use its best efforts to list such Series  5.50%  Debentures  on
the  New  York  Stock  Exchange  or on  such  other  exchange  as the  Preferred
Securities are then listed and traded.

         SECTION 4.03.  The Company  covenants and agrees for the benefit of the
holders of the Preferred  Securities to comply fully with all of its obligations
and agreements under the Declaration of Trust,  including,  without  limitation,
its obligations under Article 4 thereof.

         SECTION 4.04.  Prior to the  distribution of Series 5.50% Debentures to
the  holders of  Preferred  Securities  upon a  Dissolution  Event,  the Company
covenants and agrees for the benefit of the holders of the Preferred  Securities
(i) not to cause or permit the Common Securities to be transferred except as



                                       16


permitted  by the  Declaration  of Trust  and (ii)  that it will use  reasonable
efforts to cause the Trust to  continue  to be  treated  as a grantor  trust for
United  States  federal  income  tax  purposes,  except  in  connection  with  a
distribution  of the Series 5.50%  Debentures as provided in the  Declaration of
Trust.


                                    ARTICLE 5
                            CONVERSION OF DEBENTURES

         SECTION 5.01.  Subject to and upon  compliance  with the  provisions of
this Article Five, the Series 5.50%  Debentures are convertible at the option of
the Holder, at any time through the close of business on September 30, 2012 (or,
in the case of Series 5.50% Debentures called for redemption, prior to the close
of business on the Business Day prior to the corresponding redemption date) into
fully paid and nonassessable shares of Common Stock of the Company at an initial
conversion  rate of  0.8914  shares of  Common  Stock for each $50 in  aggregate
principal  amount of Series 5.50%  Debentures  (equal to a conversion  price (as
adjusted  from time to time,  the  "CONVERSION  PRICE")  of $56.09  per share of
Common Stock), subject to adjustment as described in this Article Five. A Holder
of Series 5.50%  Debentures  may convert any portion of the principal  amount of
the Series 5.50%  Debentures  into that number of fully paid and nonas  sessable
shares of Common Stock  obtained by dividing the principal  amount of the Series
5.50%  Debentures to be converted by such  conversion  price.  All  calculations
under this  Article  Five shall be made to the  nearest  cent or to the  nearest
1/100th of a share, as the case may be.

         SECTION  5.02.  (a) In order to convert  all or a portion of the Series
5.50%  Debentures,  the Holder thereof shall deliver to the Conversion  Agent an
irrevocable  Notice of Conversion  setting forth the principal  amount of Series
5.50% Debentures to be converted, together with the name or names, if other than
the Holder, in which the shares of Common Stock should be issued upon conversion
and, if such Series 5.50%  Debentures  are definitive  Series 5.50%  Debentures,
surrender to the Conversion  Agent the Series 5.50%  Debentures to be converted,
duly endorsed or assigned to the Company or in blank.  In addition,  a holder of
Preferred  Securities  may exercise its right under the  Declaration of Trust to
convert  such  Preferred  Securities  into  Common  Stock by  delivering  to the
Conversion  Agent  an  irrevocable   Notice  of  Conversion  setting  forth  the
information  called for by the preceding  sentence and directing the  Conversion
Agent to (i) exchange such Preferred  Security for a portion of the Series 5.50%
Debentures  held by the Trust (at an exchange  rate of $50  principal  amount of
Series 5.50% Debenture for each Preferred Security) and (ii) immediately convert
such Series 5.50% Debenture,  on behalf of such holder, into Common Stock of



                                       17


the Company pursuant to this Article Five and, if such Preferred  Securities are
in definitive form,  surrendering  such Preferred  Securities,  duly endorsed or
assigned to the Company or in blank.  So long as any  Preferred  Securities  are
outstanding,  the Trust  shall not  convert any Series  5.50%  Debenture  except
pursuant to a Notice of Conversion delivered to the Conversion Agent by a holder
of  Preferred  Securities.  Any  reference  herein to a  "HOLDER"  of  Preferred
Securities  shall  mean  a  "HOLDER"  of  such  securities  as  defined  in  the
Declaration of Trust.

         If a Preferred  Security is surrendered for conversion  after the close
of business on any regular record date for payment of a Distribution  and before
the opening of business on the  corresponding  Distribution  payment date, then,
notwithstanding  such conversion,  the Distribution payable on such Distribution
payment  date will be paid in cash to the person in whose name the Series  5.50%
Debenture is registered at the close of business on such record date, and (other
than a Series 5.50%  Debenture or a portion of a Series 5.50%  Debenture  called
for redemption on a redemption  date occurring  after such record date and on or
prior to such Distribution payment date) when so surrendered for conversion, the
Series 5.50%  Debenture must be accompanied by payment of an amount equal to the
Distribution  payable on such  Distribution  payment  date.  Except as otherwise
provided in the immediately  preceding sentence, in the case of any Series 5.50%
Debenture which is converted,  interest whose Maturity Date is after the date of
conversion of such Series 5.50% Debenture shall not be payable,  and the Company
shall  not make  nor be  required  to make  any  other  payment,  adjustment  or
allowance  with  respect to  accrued  but unpaid  interest  on the Series  5.50%
Debenture  being  converted,  which  shall be  deemed  to be paid in full.  Each
conversion shall be deemed to have been effected  immediately prior to the close
of  business  on the day on which the Notice of  Conversion  was  received  (the
"CONVERSION  DATE") by the Conversion  Agent from the Holder or from a holder of
the  Preferred  Securities  effecting  a  conversion  thereof  pursuant  to  its
conversion  rights  under the  Declaration,  as the case may be.  The  Person or
Persons entitled to receive the Common Stock issuable upon such conversion shall
be treated for all purposes as the record holder or holders of such Common Stock
as of the Conversion Date. As promptly as practicable on or after the Conversion
Date, the Company shall issue and deliver at the office of the Conversion Agent,
unless  otherwise  directed  by  the  Holder  in the  Notice  of  Conversion,  a
certificate  or  certificates  for the  number of full  shares  of Common  Stock
issuable upon such conversion,  together with the cash payment,  if any, in lieu
of any  fraction  of any share to the Person or Persons  entitled to receive the
same. The Conversion  Agent shall deliver such  certificate or  certificates  to
such Person or Persons.

         (b) The  Company's  delivery  upon  conversion  of the fixed  number of
shares of Common Stock into which the Series 5.50%  Debentures  are  convertible



                                       18


(together with the cash payment,  if any, in lieu of fractional shares) shall be
deemed to  satisfy  the  Company's  obligation  to pay the  principal  amount at
maturity of the portion of Series 5.50%  Debentures  so converted and any unpaid
interest (including Compounded Interest) accrued on such Series 5.50% Debentures
at the time of such conversion.

         (c) No fractional  shares of Common Stock will be issued as a result of
conversion, but in lieu thereof, the Company shall pay to the Conversion Agent a
cash  adjustment in an amount equal to the same fraction of the Closing Price of
such fractional  interest on the date on which the Series 5.50%  Debentures were
duly surrendered to the Conversion Agent for conversion,  or, if such day is not
a day on which any securities are traded on the national  securities exchange or
quotation  system used to determine the Closing Price (a "TRADING  DAY"), on the
next Trading Day, and the  Conversion  Agent in turn will make such payment,  if
any, to the Holder of the Series 5.50% Debentures or the holder of the Preferred
Securities so converted.

         (d) In the event of the  conversion  of any Series  5.50%  Debenture in
part only, a new Series  5.50%  Debenture  or Series  5.50%  Debentures  for the
unconverted  portion  thereof  will be issued in the name of the Holder  thereof
upon the cancellation thereof in accordance with Section 2.05 of the Indenture.

         (e) In effecting the conversion  transactions described in this Section
5.02,  the  Conversion  Agent is acting  as agent of the  holders  of  Preferred
Securities (in the exchange of Preferred Securities for Series 5.50% Debentures)
and as agent of the Holders of Series 5.50%  Debentures  (in the  conversion  of
Series 5.50%  Debentures into Common Stock),  as the case may be. The Conversion
Agent is hereby  authorized (i) to exchange Series 5.50%  Debentures held by the
Trust  from  time to time  for  Preferred  Securities  in  connection  with  the
conversion of such Preferred Securities in accordance with this Article Five and
(ii) to convert  all or a portion of the Series  5.50%  Debentures  into  Common
Stock and  thereupon to deliver such shares of Common Stock in  accordance  with
the  provisions  of this  Article  Five and to deliver to the Trust a new Series
5.50%  Debenture  or  Series  5.50%  Debentures  for any  resulting  unconverted
principal amount.

         SECTION 5.03.   (a) The Conversion Price shall be adjusted from time to
time as follows:

              (i) In case the  Company  shall  pay or make a  dividend  or other
         distribution  on  Common  Stock in shares  of  Common  Stock,  then the
         Conversion  Price in  effect  at the  opening  of  business  on the day
         following the date fixed for the determination of shareholders entitled
         to receive such



                                       19


         dividend or other  distribution  shall be reduced by  multiplying  such
         Conversion  Price by a fraction  the  numerator  of which  shall be the
         number of shares of Common Stock  outstanding  at the close of business
         on the date fixed for such  determination  and the denominator of which
         shall be the sum of such  number  of  shares  and the  total  number of
         shares constituting such dividend or other distribution, such reduction
         to become  effective  immediately  after the opening of business on the
         day following the date fixed for such  determination.  For the purposes
         of this  subparagraph  (i), the number of shares of Common Stock at any
         time  outstanding  shall not include shares held in the treasury of the
         Company  (except to the extent such dividend or  distribution  is being
         made with respect to such shares) but shall include shares  issuable in
         respect of scrip certificates  issued in lieu of fractions of shares of
         Common Stock.

              (ii) In case the  outstanding  shares  of  Common  Stock  shall be
         subdivided  into a greater  number of shares of Common Stock,  then the
         Conversion  Price in  effect  at the  opening  of  business  on the day
         following the day upon which such subdivision  becomes  effective shall
         be proportionately  reduced,  and, conversely,  in case the outstanding
         shares of  Common  Stock  shall be  combined  into a smaller  amount of
         shares  of Common  Stock,  then the  Conversion  Price in effect at the
         opening  of  business  on the day  following  the day upon  which  such
         combination becomes effective shall be proportionately  increased, such
         reduction  or  increase,  as the  case  may  be,  to  become  effective
         immediately  after the opening of business on the day following the day
         upon which such subdivision or combination becomes effective.

              (iii) In case the Company  shall  issue  rights or warrants to all
         holders of Common Stock entitling them (for a period expiring within 45
         days after the record date fixed for a  distribution  of such rights or
         warrants)  to  subscribe  for or purchase  shares of Common  Stock at a
         price per share  less than the  Current  Market  Price (as  hereinafter
         defined) per share (determined as provided in subparagraph (vii) below)
         of Common Stock on the date fixed for the determination of shareholders
         entitled to receive such rights or warrants  (other than  pursuant to a
         dividend reinvestment plan), then the Conversion Price in effect at the
         opening  of  business  on the day  following  the date  fixed  for such
         determination  shall be reduced by multiplying such Conversion Price by
         a  fraction  the  numerator  of which  shall be the number of shares of
         Common Stock outstanding at the close of business on the date fixed for
         such determination plus the number of shares of Common Stock which the
         aggregate of the offering price of the total number of shares of Common
         Stock so offered for  subscription  or purchase  would purchase at such



                                       20


         Current Market Price and the denominator  shall be the number of shares
         of Common Stock  outstanding at the close of business on the date fixed
         for such  determination  plus the  number of shares of Common  Stock so
         offered  for  subscription  or  purchase,   such  reduction  to  become
         effective  immediately  after  the  opening  of  business  on  the  day
         following  the date fixed for such  determination.  For the purposes of
         this  subparagraph  (iii),  the number of shares of Common Stock at any
         time  outstanding  shall not include shares held in the treasury of the
         Company  but  shall  include  shares   issuable  in  respect  of  scrip
         certificates issued in lieu of fractions of shares of Common Stock. The
         Company agrees not to issue any rights or warrants in respect of shares
         of Common Stock held in the treasury of the Company. To the extent that
         shares of Common Stock are not delivered  after the  expiration of such
         rights or warrants,  the  Conversion  Price shall be  readjusted to the
         Conversion Price which would then be in effect had the adjustments made
         in respect of the issuance of such rights or warrants  been made on the
         basis of delivery of only the number of shares of Common Stock actually
         delivered.

         (iv) Subject to the second paragraph of this subparagraph (iv), in case
         the Company shall, by dividend or otherwise,  distribute to all holders
         of Common Stock (A) shares of capital stock of the Company  (other than
         Common Stock),  (B) evidence of  indebtedness of the Company and/or (C)
         other assets  (including  securities,  but  excluding (1) any rights or
         warrants  referred to in  subparagraph  (iii) above,  (2) any rights or
         warrants to obtain capital stock of a company other than the Company or
         any subsidiary of the Company  (including  any rights  offerings of the
         Company with respect to capital stock of companies in which the Company
         has  an   investment   (a  "RIGHTS   OFFERING")),   (3)   dividends  or
         distributions  in  connection  with  the  liquidation,  dissolution  or
         winding-up of the Company,  (4) dividends  payable  solely in cash that
         may from time to time be fixed by the Board of Directors of the Company
         and (5)  dividends or  distributions  referred to in  subparagraph  (i)
         above),  then in each case  (unless  the  Company  makes  the  election
         referred  to in the  next  sentence)  the  Conversion  Price  shall  be
         adjusted  so  that  the  same  shall  equal  the  price  determined  by
         multiplying  the Conversion  Price in effect  immediately  prior to the
         close of business on such record date by a fraction  the  numerator  of
         which  shall be the  Current  Market  Price  per share  (determined  as
         provided  in  subparagraph  (vii)  below) of the  Common  Stock on such
         record date (the  "REFERENCE  DATE") less the then fair market value on
         the  Reference  Date  (as  determined  in good  faith  by the  Board of
         Directors of the Company,  whose  determination shall be conclusive and
         shall be described  in a statement  filed with the  Depositary  and the
         Trustee) of the portion of the shares of capital  stock of the Company,
         evidences of indebtedness or other assets so



                                       21


         distributed  (and for which an adjustment to the  Conversion  Price has
         not been made  previously  pursuant to the terms of this Article  Five)
         applicable  to one share of Common Stock and the  denominator  shall be
         such  Current  Market  Price  per  share  of  the  Common  Stock,  such
         adjustment  to become  effective  immediately  prior to the  opening of
         business on the day following the Reference Date. However,  the Company
         may elect, in its sole discretion, in lieu of the foregoing adjustment,
         to make adequate provision so that each holder of Securities shall have
         the right to receive  upon  conversion  thereof  the amount and kind of
         shares of capital stock, evidences of indebtedness or other assets such
         holder  would have  received had such holder  converted  such shares on
         such record date.  If the Board of Directors of the Company  determines
         the  fair  market  value  of any  distribution  for  purposes  of  this
         subparagraph  (iv) by  reference  to the actual or when issued  trading
         market  for any  securities  (including  shares  of  capital  stock  or
         evidence of indebtedness  of the Company)  comprising a distribution of
         securities,  it must in doing so consider the price in such market over
         the period used in  computing  the Current  Market  Price of the Common
         Stock.

                  For  purposes  of this  subparagraph  (iv),  any  dividend  or
         distribution  that  includes  both (x) any of the  items  described  in
         clauses  (A), (B) or (C) of the first  paragraph  of this  subparagraph
         (iv) and (y) Common  Stock or rights or  warrants to  subscribe  for or
         purchase  Common Stock of the type  referred to in  subparagraph  (iii)
         shall be  deemed  to be (1) a  dividend  or  distribution  of shares of
         capital stock of the Company  (other than Common  Stock),  evidences of
         indebtedness  of the Company or other assets of the type referred to in
         clause (C) of the first paragraph of this subparagraph (iv) (making any
         Conversion  Price  reduction   required  by  this  subparagraph   (iv))
         immediately  followed by (2) a dividend or  distribution of such Common
         Stock or  rights  or  warrants  to  purchase  Common  Stock of the type
         referred to in subparagraph  (iii) (making any further Conversion Price
         reduction  required  by  subparagraph  (i) or  (iii)  of  this  Section
         5.03(a)),   except  (A)  the   Reference   Date  of  such  dividend  or
         distribution as defined in this  subparagraph (iv) shall be substituted
         as "the date fixed for the  determination  of shareholders  entitled to
         receive  such  rights  or  warrants"  and  "the  date  fixed  for  such
         determination"  within the  meaning of  subparagraphs  (i) and (iii) of
         this  Section  5.03(a) and (B) any shares of Common  Stock  included in
         such dividend or distribution  shall not be deemed  "outstanding at the
         close of business on the date fixed for such determination"  within the
         meaning of subparagraph (i) of this Section 5.03(a).




                                       22


                  The  occurrence  of a  distribution  or the  occurrence of any
         other  event as a result of which  holders of Series  5.50%  Debentures
         converting  such notes into Common Stock hereunder will not be entitled
         to receive rights issued pursuant to any shareholder  protective rights
         agreement  now or hereafter in effect (the "OTHER  RIGHTS") in the same
         amount  and  manner  as if  such  holders  had  converted  such  shares
         immediately prior to the occurrence of such distribution or other event
         shall be deemed a  distribution  of Other  Rights for the  purposes  of
         conversion  adjustments  pursuant to this subparagraph (iv). In lieu of
         making any adjustment to the Conversion  Price under this  subparagraph
         (iv) as a result of such a  distribution  of Other Rights,  the Company
         may elect, in its sole  discretion,  to provide that Other Rights shall
         be issuable in the same amount and manner upon conversion of the Series
         5.50%  Debentures  without regard to whether the shares of Common Stock
         issuable  upon  conversion of the Series 5.50%  Debentures  were issued
         before or after such distribution or other event.

              (v) In case the Company  shall,  by dividend or otherwise,  at any
         time distribute cash to all holders of Common Stock,  excluding (A) any
         cash  dividends on Common Stock to the extent that the  aggregate  cash
         dividends per share of Common Stock in any consecutive  12-month period
         do not exceed the  greater of (x) the amount per share of Common  Stock
         of the cash  dividends  paid on the  Common  Stock  in the  immediately
         preceding  12-month  period,  to the extent that such dividends for the
         immediately  preceding 12-month period did not require an adjustment to
         the Conversion Price pursuant to this  subparagraph (v) (as adjusted to
         reflect  subdivisions  or combinations of the Common Stock) and (y) 15%
         of the average of the daily Closing Prices (as hereinafter  defined) of
         the Common Stock for the ten consecutive Trading Days immediately prior
         to the date of  declaration  of such  dividend  and (B) any dividend or
         distribution  in  connection  with  the  liquidation,   dissolution  or
         winding-up of the Company,  whether  voluntary or  involuntary;  or any
         redemption of any Other Rights;  provided,  however, that no adjustment
         shall be made pursuant to this  subparagraph  (v) if such  distribution
         would  otherwise   constitute  a  Fundamental  Change  (as  hereinafter
         defined) and be reflected in a resulting  adjustment to the  Conversion
         Price as provided in this Article  Five) then, in each case (unless the
         Company makes the election  referred to in the proviso  following  this
         clause),  the Conversion  Price shall be reduced so that the same shall
         equal the price  determined  by  multiplying  the  Conversion  Price in
         effect at the close of business  on such record date by a fraction  the
         numerator  of which  shall be the  Closing  Price of a share of  Common
         Stock on such  record date less the amount of cash so  distributed  (to
         the extent not excluded as provided above) applicable to



                                       23


         one share of Common  Stock,  and the  denominator  shall be the Closing
         Price of a share of Common Stock,  such  reduction to become  effective
         immediately  prior to the opening of business on the day following such
         record date; provided, however, that the Company may elect, in its sole
         discretion,  in  lieu of the  foregoing  adjustment,  to make  adequate
         provision so that each holder of Securities  shall  thereafter have the
         right to receive upon  conversion  the amount of cash such holder would
         have  received had such holder  converted  each Security on such record
         date.  If any  adjustment  is  required to be made as set forth in this
         subparagraph  (v) as a result  of a  distribution  which is a  dividend
         described in clause (A) of this  subparagraph (v), such adjustment will
         be based upon the amount by which such distribution  exceeds the amount
         of the dividend permitted to be excluded pursuant to such clause (A) of
         this subparagraph (v). If an adjustment is required to be made pursuant
         to this  subparagraph  (v) as a result of a  distribution  which is not
         such a dividend, such adjustment would be based upon the full amount of
         such distribution.

              (vi) In case of the  consummation  of a tender or  exchange  offer
         (other  than  an  odd-lot  tender  offer)  made by the  Company  or any
         subsidiary  of the Company  for all or any  portion of the  outstanding
         shares  of Common  Stock to the  extent  that the cash and fair  market
         value (as  determined  in good faith by the Board of  Directors  of the
         Company, whose determination shall be conclusive and shall be described
         in a resolution of such Board) of any other  consideration  included in
         such  payment  per  share  of  Common  Stock  at  the  last  time  (the
         "EXPIRATION  TIME")  tenders or exchanges  may be made pursuant to such
         tender or exchange offer (as amended) exceed by more than 10%, with any
         smaller  excess being  disregarded  in computing the  adjustment to the
         Conversion Price provided in this subparagraph (vi), the first reported
         sale price per share of Common Stock on the Trading Day next succeeding
         the Expiration Time, then the Conversion Price shall be reduced so that
         the same shall equal the price determined by multiplying the Conversion
         Price in effect  immediately prior to the Expiration Time by a fraction
         the  numerator  of which shall be the number of shares of Common  Stock
         outstanding  (including  any  tendered  or  exchanged  shares)  on  the
         Expiration  Time  multiplied  by the first  reported  sale price of the
         Common Stock on the Trading Day next succeeding the Expiration Time and
         the  denominator  shall  be the  sum  of  (x)  the  fair  market  value
         (determined  as aforesaid) of the  aggregate  consideration  payable to
         shareholders  based on the acceptance  (up to any maximum  specified in
         the  terms of the  tender or  exchange  offer)  of all  shares  validly
         tendered or exchanged and not withdrawn as of the Expiration  Time (the
         shares deemed so accepted, up to any such maximum, being referred to as
         the "PURCHASED SHARES") and (y) the



                                       24


         product of the number of shares of Common Stock  outstanding  (less any
         Purchased  Shares) on the  Expiration  Time and the first reported sale
         price of the  Common  Stock on the  Trading  Day  next  succeeding  the
         Expiration Time, such reduction to become effective  immediately  prior
         to the opening of business on the day following the Expiration Time.

              (vii) For the purpose of any computation  under this Article Five,
         the  "CURRENT  MARKET PRICE PER SHARE" of Common Stock on any day shall
         be deemed to be the average of the daily Closing Prices (as hereinafter
         defined) per share of Common Stock for the ten consecutive Trading Days
         prior to and including the date in question;  provided,  however,  that
         (1) if the "ex" date (as hereinafter defined) for any event (other than
         the  issuance,   distribution  or  Fundamental  Change  requiring  such
         computation)  that  requires  an  adjustment  to the  Conversion  Price
         pursuant to this Article Five (the "OTHER  EVENT")  occurs  during such
         ten  consecutive  Trading  Days  and  prior  to the  "ex"  date for the
         issuance, distribution or Fundamental Change requiring such computation
         (the "CURRENT EVENT"),  the Closing Price for each Trading Day prior to
         the "ex" date for such Other Event  shall be  adjusted  by  multiplying
         such Closing Price by the same fraction by which the  Conversion  Price
         is so required to be adjusted as a result of such Other  Event,  (2) if
         the "ex" date for any Other Event  occurs on or after the "ex" date for
         the Current Event and on or prior to the date in question,  the Closing
         Price for each  Trading  Day on and after the "ex" date for such  Other
         Event  shall be  adjusted  by  multiplying  such  Closing  Price by the
         reciprocal of the fraction by which the Conversion Price is so required
         to be adjusted as a result of such Other  Event  (provided  that in the
         event  that  such  fraction  is  required  to be  determined  at a date
         subsequent to the date in question and with  reference to events taking
         place subsequent to the date in question, the Board of Directors of the
         Company  or,  to  the  extent  permitted  by  applicable  law,  a  duly
         authorized  committee thereof,  whose determination shall be conclusive
         and  described in a resolution of the Board of Directors of the Company
         or such duly authorized committee thereof, as the case may be, shall in
         good  faith  estimate  such  fraction  based  on  assumptions  it deems
         reasonable regarding such events taking place subsequent to the date in
         question,  and such  estimated  fraction  shall be used for purposes of
         such  adjustment  until such time as the actual  fraction  by which the
         Conversion  Price is so  required  to be  adjusted  as a result of such
         Other  Event is  determined),  and (3) if the "ex" date for the Current
         Event is on or prior to the date in question, after taking into account
         any adjustment  required pursuant to clause (1) or (2) of this proviso,
         the Closing Price for each Trading Day on or after such "ex" date shall
         be  adjusted  by  adding  thereto  the  amount of any cash and the fair
         market value (as determined in good



                                       25


         faith by the  Board of  Directors  of the  Company  or,  to the  extent
         permitted by applicable law, a duly authorized  committee  thereof in a
         manner  consistent with any determination of such value for purposes of
         this  Article  Five,  whose   determination  shall  be  conclusive  and
         described in a  resolution  of the Board of Directors of the Company or
         such  duly  authorized  committee  thereof,  as the case may be) of the
         shares of capital  stock,  evidences  of  indebtedness  or other assets
         being  distributed  applicable  to one share of Common  Stock as of the
         close of  business on the day before  such "ex" date.  For  purposes of
         this subparagraph (vii), the term "ex" date, (1) when used with respect
         to any issuance,  distribution or Fundamental  Change,  means the first
         date on which the  Common  Stock  trades  regular  way on the  relevant
         exchange or in the  relevant  market  from which the Closing  Price was
         obtained without the right to receive such issuance,  such distribution
         or the cash, securities, property or other assets distributable in such
         Fundamental  Change to holders of the Common Stock,  (2) when used with
         respect to any  subdivision  or  combination of shares of Common Stock,
         means the first date on which the Common  Stock  trades  regular way on
         such  exchange  or  in  such  market  after  the  time  at  which  such
         subdivision  or  combination  becomes  effective and (3) when used with
         respect to any tender or  exchange  offer means the first date on which
         the Common Stock trades  regular way on such exchange or in such market
         after the Expiration Time of such offer.

              (viii) No  adjustment  in the  Conversion  Price shall be required
         pursuant to this Section 5.03(a) unless the adjustment  would require a
         change  of at  least  1% of such  price;  provided,  however,  that any
         adjustments  which  by  reason  of  this  subparagraph  (viii)  are not
         required to be made shall be carried  forward and taken into account in
         any  subsequent  adjustment.  All  calculations  shall  be  made to the
         nearest cent (with .005 being rounded upward) or to the nearest 1/100th
         of a share (with .005 of a share being rounded upward), as the case may
         be. Notwithstanding  anything to the contrary in this Article Five, the
         Company from time to time may, to the extent  permitted by law,  reduce
         the  Conversion  Price  by any  amount  for any  period  of at least 20
         Business  Days,  in which case the Company shall give at least 15 days'
         notice of such reduction to the holders of Series 5.50%  Debentures and
         the  Trustee.  In addition,  the Company may, at its option,  make such
         reductions  in the  Conversion  Price in addition to those set forth in
         this Article Five, as it considers to be advisable in order to avoid or
         diminish  any  income  tax to any  holders  of shares  of Common  Stock
         resulting  from any  dividend or  distribution  of stock or issuance of
         rights or warrants to purchase or subscribe for stock or from any event
         treated as such for income tax purposes or for any other reasons.



                                       26


              (ix) In any case in  which  this  Article  Five  provides  that an
         adjustment shall become effective  immediately  after a record date for
         an event,  the Company may defer until the occurrence of such event (A)
         issuing to the holder of any Series 5.50%  Debentures  converted  after
         such record date and before the occurrence of such event the additional
         shares of Common Stock  issuable upon such  conversion by reason of the
         adjustment  required  by such  event  over and above the  Common  Stock
         issuable upon such  conversion  before giving effect to such adjustment
         and  (B)  paying  to  such  holder  any  amount  in cash in lieu of any
         fractional shares pursuant to this Article Five.

              (x) For purposes of this Article Five, "COMMON STOCK" includes any
         stock of any class of the Company which has no preference in respect of
         dividends  or of  amounts  payable  in the  event of any  voluntary  or
         involuntary  liquidation,  dissolution or winding-up of the Company and
         which is not subject to redemption by the Company.  However, subject to
         the provisions of this Article Five,  shares  issuable on conversion of
         Series  5.50%  Debentures  shall  include  only  shares  of  the  class
         designated  as the  Company  Common  Stock on the  date of the  initial
         issuance  of Series  5.50%  Debentures  by the Company or shares of any
         class   or   classes   resulting   from   any    reclassification    or
         reclassification  thereof  and which have no  preference  in respect of
         dividends  or of  amounts  payable  in the  event of any  voluntary  or
         involuntary  liquidation,  dissolution or winding-up of the Company and
         which are not subject to redemption by the Company; provided,  however,
         that if at any time there shall be more than one such resulting  class,
         the shares of each such class then so issuable  shall be  substantially
         in the  proportion  which  the total  number  of  shares of such  class
         resulting from all such reclassifications  bears to the total number of
         shares of all such classes resulting from all such reclassifications.

         (b) Whenever the Conversion Price is adjusted as herein provided:

              (i) the Company  shall compute the adjusted  Conversion  Price and
         shall prepare a certificate  signed by the Chief  Financial  Officer or
         the  Treasurer of the Company  setting  forth the  adjusted  Conversion
         Price and  showing  in  reasonable  detail  the facts  upon  which such
         adjustment is based, and such certificate shall forthwith be filed with
         the Trustee and the transfer agent for the Preferred Securities and the
         Series 5.50% Debentures; and



                                       27


              (ii) a notice stating the  Conversion  Price has been adjusted and
         setting  forth  the  adjusted   Conversion   Price  shall  as  soon  as
         practicable be mailed by the Company to all record holders of Preferred
         Securities  and the Series 5.50%  Debentures at their last addresses as
         they appear upon the stock transfer books of the Company and the Trust.

         SECTION 5.04. (a) In the event that the Company shall be a party to any
transaction  or  series  of  transactions  constituting  a  Fundamental  Change,
including,  without limitation,  (i) any recapitalization or reclassification of
shares of Common Stock (other than a change in the par value or as a result of a
subdivision or combination of the Common Stock),  (ii) any  consolidation of the
Company with, or merger of the Company into, any other corporation or any merger
of another  corporation  into the Company as a result of which holders of Common
Stock  shall be  entitled  to receive  securities  or other  property  or assets
(including  cash) with  respect to or in exchange for Common Stock (other than a
merger  which does not result in a  reclassification,  conversion,  exchange  or
cancellation of outstanding shares of Common Stock),  (iii) any sale or transfer
of all or substantially all of the assets of the Company, or (iv) any compulsory
share  exchange,  pursuant to any of which the holders of Common  Stock shall be
entitled to receive other securities,  cash or other property,  then appropriate
provision  shall be made as part of the terms of such  transaction  or series of
transactions so that the holder of each Series 5.50% Debenture then  outstanding
shall have the right thereafter to convert such Series 5.50% Debenture only into
(A) if any such  transaction  does not  constitute  a Common  Stock  Fundamental
Change (as hereinafter defined), the kind and amount of the securities,  cash or
other  property  that would  have been  receivable  upon such  recapitalization,
reclassification,  consolidation,  merger, sale, transfer or share exchange by a
holder of the number of shares of Common  Stock into  which  such  Series  5.50%
Debenture might have been converted immediately prior to such  recapitalization,
reclassification,  consolidation,  merger,  sale,  transfer  or share  exchange,
after, in the case of a Non-Stock  Fundamental Change (as hereinafter  defined),
giving  effect  to  any  adjustment  in the  Conversion  Price  required  by the
provisions which follow in subparagraph  (i) of Section 5.04(c),  and (B) if any
such transaction  constitutes a Common Stock Fundamental Change, common stock of
the kind  received by holders of Common  Stock as a result of such Common  Stock
Fundamental  Change in an amount  determined  pursuant to the  provisions  which
follow in  subparagraph  (ii) of Section  5.04(c).  The  company  formed by such
consolidation  or resulting  from such merger or which  acquires  such assets or
which  acquires  the  Common  Stock,  as the case  may be,  shall  enter  into a
supplemental  indenture with the Trustee,  satisfactory  in form to the Trustee,
the  provisions  of which  establishes  such right and provide  for  adjustments
which,  for  events  subsequent  to the  effective  date  of  such  supplemental
indenture,  shall  be  as  nearly  equivalent  as  may  be  practicable  to  the
adjustments provided for in this
Article Five.  The above



                                       28


provisions    shall    similarly    apply   to   successive    recapitalization,
reclassifications, consolidations, mergers, sales, transfers or share exchanges.

         (b)  Notwithstanding  any other  provisions in this Article Five to the
contrary,  if any Fundamental Change (as hereinafter  defined) occurs,  then the
Conversion  Price  in  effect  will  be  adjusted  immediately   following  such
Fundamental  Change as described below in Section 5.04(c).  In addition,  in the
event of a Common Stock Fundamental Change, each Series 5.50% Debenture shall be
convertible  solely into common stock of the kind  received by holders of Common
Stock as the result of such Common Stock Fundamental Change as more specifically
provided below in Section 5.04(c).

         (c) For purposes of  calculating  any adjustment to be made pursuant to
this Article Five in the event of a Fundamental  Change,  immediately  following
such  Fundamental  Change (and for such purposes a  Fundamental  Change shall be
deemed to occur on the earlier of (a) the occurrence of such Fundamental  Change
and (b) the date, if any, fixed for  determination  of shareholders  entitled to
receive the cash,  securities,  property or other assets  distributable  in such
Fundamental Change to holders of the Common Stock):

              (i) in the case of a Non-Stock  Fundamental Change, the Conversion
         Price per share of Common Stock  immediately  following  such Non-Stock
         Fundamental  Change shall be the lower of (A) the  Conversion  Price in
         effect  immediately  prior to such Non-Stock  Fundamental  Change,  but
         after giving effect to any other adjustments  effected pursuant to this
         Article Five,  and (B) the product of (1) the greater of the Applicable
         Price (as hereinafter  defined) or the then applicable Reference Market
         Price (as  hereinafter  defined)  and (2) a fraction  the  numerator of
         which  shall be $100 and the  denominator  of which shall be the amount
         based on the date on which such  Non-Stock  Fundamental  Change occurs.
         For the twelve month period beginning October 29, 1997, the denominator
         will be 105.50, and the denominator will decrease by 0.6875 during each
         successive 12-month period;  provided, that the denominator shall in no
         event be less than 100.0.

              (ii)  in the  case  of a  Common  Stock  Fundamental  Change,  the
         Conversion  Price per share of Common Stock  immediately  following the
         Common Stock Fundamental Change shall be the Conversion Price in effect
         immediately  prior to such Common Stock Fundamental  Change,  but after
         giving  effect  to any  other  adjustments  effected  pursuant  to this
         Article Five,  multiplied by a fraction,  the numerator of which is the
         Purchaser Stock Price (as  hereinafter  defined) and the denominator of
         which is the Applicable Price; provided,  however, that in the event of
         a



                                       29


         Common Stock Fundamental Change in which (A) 100% of the value  of  the
         consideration  received by a holder of Common  Stock is common stock of
         the  successor,  acquiror or other third party (and cash,  if any, paid
         with respect to any fractional interests in such common stock resulting
         from such Common  Stock  Fundamental  Change) and (B) all of the Common
         Stock shall have been  exchanged  for,  converted  into or acquired for
         common stock (and cash, if any,  with respect to fractional  interests)
         of the successor,  acquiror or other third party,  the Conversion Price
         per share of Common  Stock  immediately  following  such  Common  Stock
         Fundamental  Change shall be the Conversion Price in effect immediately
         prior to such Common Stock Fundamental  Change divided by the number of
         shares of common stock of the successor, acquiror, or other third party
         received  by a holder of one share of Common  Stock as a result of such
         Common Stock Fundamental Change.

         (d)  The  following  definitions  shall  apply  to  terms  used in this
Article Five:

              (i) "APPLICABLE PRICE" shall mean (A) in the event of a Non- Stock
         Fundamental  Change in which the holders of Common  Stock  receive only
         cash, the amount of cash  receivable by a holder of one share of Common
         Stock and (B) in the event of any other Fundamental Change, the average
         of the  Closing  Prices  for one share of Common  Stock  during the ten
         Trading Days immediately prior to the record date for the determination
         of the holders of Common Stock  entitled to receive  cash,  securities,
         property or other assets in connection with such Fundamental Change or,
         if there is no such  record  date,  prior to the date  upon  which  the
         holders of Common  Stock  shall  have the right to  receive  such cash,
         securities, property or other assets.

              (ii)  "CLOSING  PRICE" with respect to any  securities  on any day
         shall mean the closing sale price, regular way, on such day or, in case
         no such sale  takes  place on such day,  the  average  of the  reported
         closing bid and asked prices, regular way, in each case on the New York
         Stock  Exchange  or, if such  security  is not  listed or  admitted  to
         trading on such Exchange, on the principal national securities exchange
         or  quotation  system  on which  such  security  is quoted or listed or
         admitted  to trading or, if not quoted or listed or admitted to trading
         on any national securities exchange or quotation system, the average of
         the   closing   bid  and  asked   prices  of  such   security   on  the
         over-the-counter  market on the date in  question  as  reported  by the
         National  Quotation  Bureau  Incorporated,  or  a  similarly  generally
         accepted  reporting service or, if not so available,  in such manner as
         furnished by any New York Stock Exchange member firm



                                       30


         selected from time to time by the Board of Directors of the Company for
         that  purpose  or a price  determined  in good  faith  by the  Board of
         Directors of the Company.

              (iii) "COMMON STOCK FUNDAMENTAL CHANGE" shall mean any Fundamental
         Change in which more than 50% of the value (as determined in good faith
         by the Board of Directors of the Company) of the consideration received
         by the holders of Common Stock pursuant to such  transactions  consists
         of shares of common stock that,  for the ten  consecutive  Trading Days
         immediately  prior to such  Fundamental  Change,  has been admitted for
         listing or  admitted  for  listing  subject to notice of  issuance on a
         national  securities  exchange or quoted on the Nasdaq National Market;
         provided,  however,  that a  Fundamental  Change  shall not be a Common
         Stock  Fundamental  Change unless  either (A) the Company  continues to
         exist  after  the  occurrence  of  such  Fundamental   Change  and  the
         outstanding  Preferred  Securities  continue  to exist  as  outstanding
         Preferred  Securities,  or (B)  the  outstanding  Preferred  Securities
         continue to exist as  Preferred  Securities  and are  convertible  into
         common stock of the successor to the Company.

              (iv)  "FUNDAMENTAL  CHANGE"  shall  mean  the  occurrence  of  any
         transaction or event or series of  transactions  or events  pursuant to
         which all or  substantially  all of the Common Stock shall be exchanged
         for,  converted into,  acquired for or constitutes  solely the right to
         receive cash, securities, property or other assets (whether by means of
         an exchange offer, liquidation,  tender offer,  consolidation,  merger,
         combination,   reclassification,    recapitalization   or   otherwise);
         provided,  however,  in the case of a plan involving more than one such
         transaction  or event,  for purposes of  adjustment  of the  Conversion
         Price,  such  Fundamental  Change shall be deemed to have occurred when
         substantially all of the Common Stock has been exchanged for, converted
         into, or acquired for or constitutes  solely the right to receive cash,
         securities, property or other assets, but the adjustment shall be based
         upon the  consideration  which the holders of Common Stock  received in
         such  transaction  or event as a result  of which  more than 50% of the
         Common Stock shall have been exchanged for, converted into, or acquired
         for or shall constitute  solely the right to receive cash,  securities,
         property or other assets.

              (v)  "NON-STOCK  FUNDAMENTAL  CHANGE"  shall mean any  Fundamental
         Change other than a Common Stock Fundamental Change.

              (vi)  "PURCHASER  STOCK  PRICE"  shall mean,  with  respect to any
         Common Stock Fundamental  Change, the average of the Closing Prices



                                       31


         for one share of the common  stock  received by holders of Common Stock
         in such Common  Stock  Fundamental  Change  during the ten Trading Days
         immediately  prior  to the  record  date for the  determination  of the
         holders of Common  Stock  entitled to receive  such common stock or, if
         there is no such record date,  prior to the date upon which the holders
         of Common Stock shall have the right to receive such common stock.

              (vii) "REFERENCE  MARKET PRICE" shall initially mean $29.92 (which
         is an amount equal to 66-2/3% of the last  reported  sale price for the
         Common  Stock on the New York Stock  Exchange on October 23, 1997) and,
         in the event of any adjustment to the Conversion  Price other than as a
         result of a Fundamental  Change,  the Reference Market Price shall also
         be  adjusted  so that the ratio of the  Reference  Market  Price to the
         Conversion  Price  after  giving  effect to any such  adjustment  shall
         always be the same as the ratio of the initial  Reference  Market Price
         to the initial Conversion Price set forth in this Article Five.

         (e) In determining the amount and type of  consideration  received by a
holder  of  Common  Stock in the event of a  Fundamental  Change,  consideration
received by a holder of Common Stock pursuant to a statutory  right of appraisal
will be disregarded.

         SECTION 5.05.    In case:

              (i)  the  Company   shall   declare  a  dividend   (or  any  other
         distribution)  on Common  Stock that would cause an  adjustment  to the
         Conversion Price of the Series 5.50%  Debentures  pursuant to the terms
         of any of the  subparagraphs  above  (including such an adjustment that
         would  occur  but  for the  terms  of the  first  sentence  of  Section
         5.03(a)(viii) above); or

              (ii) the  outstanding  shares of Common Stock shall be  subdivided
         into a greater  number of shares  of Common  Stock or  combined  into a
         smaller number of shares of Common Stock; or

              (iii) the Company  shall  authorize the granting to the holders of
         Common  Stock  generally of rights or warrants  (for a period  expiring
         within 45 days after the record date fixed for a  distribution  of such
         rights and  warrants)  to  subscribe  for or purchase any shares of the
         Company's  capital  stock or other capital stock of any class or of any
         other rights (including any Rights Offerings); or



                                       32


              (iv)  of  any  reclassification  of  Common  Stock  (other  than a
         subdivision or combination of the outstanding  shares of Common Stock),
         or of any consolidation,  merger or share exchange to which the Company
         is a party and for which approval of any shareholders of the Company is
         required, or of the sale or transfer of all or substantially all of the
         assets of the Company or a compulsory share exchange; or

              (v) of the voluntary or  involuntary  dissolution,  liquidation or
         winding-up of the Company;

         then the Company shall (i) if any Preferred Securities are outstanding,
cause to be filed with the  transfer  agent for the  Preferred  Securities,  and
shall cause to be mailed to the holders of record of the  Preferred  Securities,
at their last  addresses as they shall appear upon the stock  transfer  books of
the  Trust or (ii)  shall  cause  to be  mailed  to all  Holders  at their  last
addresses as they shall  appear in the books and records of the Trust,  at least
15 days prior to the applicable record or effective date hereinafter  specified,
a notice  stating (A) the date on which a record (if any) is to be taken for the
purpose of such  dividend,  distribution,  rights or warrants or, if a record is
not to be taken,  the date as of which the holders of Common  Stock of record to
be  entitled  to such  dividend,  distribution,  rights  or  warrants  are to be
determined  or (B)  the  date on  which  such  reclassification,  consolidation,
merger, sale, transfer, share exchange,  dissolution,  liquidation or winding up
is expected to become  effective,  and the date as of which it is expected  that
holders of Common Stock of record shall be entitled to exchange  their shares of
Common  Stock  for  securities,  cash or other  property  deliverable  upon such
reclassification,   consolidation,   merger,  sale,  transfer,  share  exchange,
dissolution,  liquidation  or winding up (but no failure to mail such  notice or
any defect  therein or in the mailing  thereof  shall affect the validity of the
corporate action required to be specified in such notice).

         SECTION 5.06. The Company shall reserve,  free from pre-emptive rights,
out of its authorized but unissued shares,  sufficient shares to provide for the
conversion of the Series 5.50% Debentures from time to time as such Series 5.50%
Debentures are presented for conversion, provided, that nothing contained herein
shall be construed to preclude the Company from  satisfying  its  obligations in
respect of the conversion of Series 5.50%  Debentures by delivery of repurchased
shares of Common Stock which are held in the treasury of the Company.

         If any  shares  of  Common  Stock to be  reserved  for the  purpose  of
conversion of Series 5.50% Debentures  hereunder  require  registration  with or
approval of any governmental authority under any Federal or State law before
such shares may be validly issued or delivered upon conversion, then the



                                       33


Company  covenants that it will in good faith and as  expeditiously  as possible
endeavor to secure such registration or approval,  as the case may be, provided,
however,  that nothing in this Section 5.06 shall be deemed to affect in any way
the  obligations of the Company to convert Series 5.50%  Debentures  into Common
Stock as provided in this Article Five.

         Before taking any action which would cause an  adjustment  reducing the
Conversion  Price  below the then par value,  if any, of the Common  Stock,  the
Company will take all corporate action which may, in the Opinion of Counsel,  be
necessary in order that the Company may validly and legally issue fully paid and
non-assessable shares of Common Stock at such adjusted Conversion Price.

         The  Company  covenants  that all shares of Common  Stock  which may be
issued upon conversion of Series 5.50%  Debentures will upon issue be fully paid
and non-assessable by the Company and free of pre-emptive rights.

         SECTION 5.07. Notwithstanding the foregoing provisions, the issuance of
any shares of Common Stock pursuant to any plan  providing for the  reinvestment
of dividends or interest payable on securities of the Company and the investment
of  additional  optional  amounts in shares of Common Stock under any such plan,
and the  issuance of any shares of Common Stock or options or rights to purchase
such shares  pursuant to any employee  benefit plan or program of the Company or
pursuant  to  any  option,  warrant,  right  or  exercisable,   exchangeable  or
convertible  security outstanding as of October 29, 1997, shall not be deemed to
constitute  an  issuance  of  Common  Stock  or  exercisable,   exchangeable  or
convertible  securities by the Company to which any of the adjustment provisions
described  above  applies.  There shall also be no adjustment of the  Conversion
Price in case of the issuance of any stock (or  securities  convertible  into or
exchangeable for stock) of the Company except as specifically  described in this
Article Five.

         SECTION  5.08.  In case the Company  shall,  by dividend or  otherwise,
declare  or make a  distribution  on the  Common  Stock  referred  to in Section
5.03(a)(iv)  or  5.03(a)(v)   (including,   without  limitation,   dividends  or
distributions  referred  to in the last  sentence of Section  5.03(a)(vi)),  the
Holder of the Series 5.50% Debenture,  upon the conversion thereof subsequent to
the close of business on the date fixed for the  determination  of  stockholders
entitled to receive  such  distribution  and prior to the  effectiveness  of the
Conversion  Price  adjustment  in  respect of such  distribution,  shall also be
entitled to receive for each share of Common  Stock into which the Series  5.50%
Debentures  are  converted,  the portion of the shares of Common Stock,  rights,
warrants, evidences of indebtedness, shares of capital stock, cash and assets so
distributed applicable to one share of Common Stock; provided, however, that, at
the election of the Company  (whose  election shall be evidenced by a resolution
of the Board of



                                       34


Directors)  with respect to all Holders so converting,  the Company may, in lieu
of distributing to such Holder any portion of such  distribution  not consisting
of cash or securities of the Company, pay such Holder an amount in cash equal to
the fair  market  value  thereof  (as  determined  in good faith by the Board of
Directors, whose determination shall be conclusive and described in a resolution
of the  Board of  Directors).  If any  conversion  of  Series  5.50%  Debentures
described in the immediately preceding sentence occurs prior to the payment date
for a  distribution  to holders of Common Stock which the Holder of Series 5.50%
Debentures  so  converted  is  entitled  to  receive  in  accordance   with  the
immediately  preceding  sentence,  the Company  may elect  (such  election to be
evidenced by a  resolution  of the Board of  Directors)  to  distribute  to such
Holder a due bill for the shares of Common Stock, rights, warrants, evidences of
indebtedness, shares of capital stock, cash or assets to which such Holder is so
entitled,  provided, that such due bill (a) meets any applicable requirements of
the principal national  securities  exchange or other market on which the Common
Stock is then  traded and (b)  requires  payment or  delivery  of such shares of
Common Stock,  rights,  warrants,  evidences of indebtedness,  shares of capital
stock,  cash or assets no later than the date of payment or delivery  thereof to
holders of shares of Common Stock receiving such distribution.


                                    ARTICLE 6
                         FORM OF SERIES 5.50% DEBENTURES

         SECTION 6.01. The Series 5.50% Debentures and the Trustee's Certificate
of  Authentication  to be  endorsed  thereon  are  to be  substantially  in  the
following forms:


                           (FORM OF FACE OF DEBENTURE)

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

         Unless this Debenture is presented by an authorized  representative  to
The Depository Trust Company (55 Water Street, New York, New York) to the issuer
or its  agent  for  registration  of  transfer,  exchange  or  payment,  and any
Debenture  issued is  registered in the name of Cede & Co. or such other name as
requested by



                                       35


an authorized  representative  of The  Depository  Trust Company and any payment
hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE
OR OTHERWISE BY A PERSON IS WRONGFUL since the registered  owner hereof,  Cede &
Co., has an interest herein.]

         [IF  THE  DEBENTURE  IS TO BE A  DEFINITIVE  CERTIFICATE  ISSUED  TO AN
INSTITUTIONAL  ACCREDITED  INVESTOR ATTACH  "ACCREDITED  INVESTOR LETTER" IN THE
FORM ATTACHED HERETO]

No.                                                                    $

CUSIP NO.  ____________


                               THE AES CORPORATION

                       5.50% JUNIOR SUBORDINATED DEBENTURE

                                    DUE 2012



         [If prior to the Transfer Restriction Termination Date or sale pursuant
to an effective registration statement or Rule 144, add legend from Section 1.04
of this Second Supplemental Indenture].

         The AES  Corporation,  a corporation  duly organized and existing under
the laws of the State of Delaware  (herein  referred to as the "COMPANY",  which
term includes any successor corporation under the Indenture hereinafter referred
to), for value received,  hereby promises to pay to , or registered assigns, the
principal sum of $___________ on September 30, 2012, and to pay interest on said
principal  sum from  October 29, 1997 or from the most recent  interest  payment
date (each such date,  an "INTEREST  PAYMENT  DATE") to which  interest has been
paid or duly provided for,  quarterly  (subject to deferral as set forth herein)
in  arrears  commencing  December  31,  1997 at the rate of 5.50% per annum plus
Compounded  Interest,  if any, until the principal  hereof shall have become due
and payable,  and on any overdue  principal  and  premium,  if any, and (without
duplication and to the extent that payment of such interest is enforceable under
applicable  law) on any  overdue  installment  of  interest at the same rate per
annum.  The amount of interest  payable on any  Interest  Payment  Date shall be
computed on the basis of a 360-day year twelve 30-day months.  In the event that
any date on which  interest is payable on this  Debenture is not a business day,
then  payment  of  interest  payable  on such  date  will  be  made on the  next
succeeding  day which is a  business  day (and  without  any  interest  or other
payment in respect of any such delay),  except that,  if such business day is in
the next succeeding calendar year,



                                       36


such payment shall be made on the  immediately  preceding  business day, in each
case  with the same  force  and  effect as if made on such  date.  The  interest
installment  so  payable,  and  punctually  paid or duly  provided  for,  on any
Interest Payment Date will, as provided in the Indenture,  be paid to the person
in whose name this Debenture (or one or more Predecessor Debentures,  as defined
in said  Indenture) is registered at the close of business on the regular record
date for such interest installment, [which shall be the close of business on the
day next  preceding  such  Interest  Payment  Date,  provided  if the  Preferred
Securities  of AES Trust II are no longer in book-entry  only form,  the regular
record dates shall be the close of business on the  fifteenth  (15th) day of the
month in which such Interest Payment Date occurs] [IF PURSUANT TO THE PROVISIONS
OF SECTION  2.11(c) OF THE INDENTURE OR SECTION 1.04 OF THE SECOND  SUPPLEMENTAL
INDENTURE THE SERIES 5.50%  DEBENTURES ARE NOT REPRESENTED BY A GLOBAL DEBENTURE
- -- which shall be the close of business on the fifteenth (15th) day of the month
in which such Interest  Payment Date occurs.] Any such interest  installment not
punctually  paid or duly provided for shall forthwith cease to be payable to the
registered holders on such regular record date, and may be paid to the person in
whose name this Debenture (or one or more Predecessor  Debentures) is registered
at the close of business on a special record date to be fixed by the Trustee for
the payment of such  defaulted  interest,  notice  whereof shall be given to the
registered  holders of this series of Debentures  not less than 10 days prior to
such special  record date, or may be paid at any time in any other lawful manner
not inconsistent  with the requirements of any securities  exchange on which the
Debentures  may be  listed,  and upon  such  notice as may be  required  by such
exchange,  all as more fully  provided in the  Indenture.  The principal of (and
premium,  if any) and the  interest  on this  Debenture  shall be payable at the
office or agency of the Company  maintained  for that  purpose in the Borough of
Manhattan, The City and State of New York, in any coin or currency of the United
States of America  which at the time of payment is legal  tender for  payment of
public and private  debts;  provided,  however,  that payment of interest may be
made at the option of the Company by check  mailed to the  registered  holder at
such address as shall appear in the  Debenture  register and that the payment of
principal will only be made upon the surrender of this Debenture to the Trustee.
Notwithstanding  the  foregoing,  so long as the owner and record holder of this
Debenture is the Property  Trustee (as defined in the  Indenture  referred to on
the reverse hereof),  the payment of the principal of (and premium,  if any) and
interest (including  Compounded Interest, if any) on this Debenture will be made
at such place and to such account of the Property  Trustee as may be  designated
by the Property Trustee.

         The indebtedness evidenced by this Debenture is, to the extent provided
in the  Indenture,  subordinate  and  subject  in right of  payment to the prior
payment in full of all Senior  and  Subordinated  Debt,  and this  Debenture  is
issued subject to



                                       37


the  provisions  of the  Indenture  with  respect  thereto.  Each Holder of this
Debenture,  by  accepting  the  same,  (a)  agrees to and shall be bound by such
provisions,  (b)  authorizes  and directs the Trustee on his behalf to take such
action as may be necessary or  appropriate  to  acknowledge  or  effectuate  the
subordination so provided and (c) appoints the Trustee his  attorney-in-fact for
any and all such purposes.  Each Holder hereof, by his acceptance hereof, hereby
waives all notice of the acceptance of the  subordination  provisions  contained
herein and in the  Indenture  by each  holder of Senior and  Subordinated  Debt,
whether now outstanding or hereafter incurred,  and waives reliance by each such
Holder upon said provisions.

         This Debenture shall not be entitled to any benefit under the Indenture
hereinafter referred to, be valid or become obligatory for any purpose until the
Certificate of  Authentication  hereon shall have been signed by or on behalf of
the Trustee.

         The  provisions  of this  Debenture  are  continued on the reverse side
hereof and such continued provisions shall for all purposes have the same effect
as though fully set forth at this place.

         IN WITNESS  WHEREOF,  the  Company  has caused  this  Instrument  to be
executed.


Dated:
      ------------------------------------


                                            The AES Corporation


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


Attest:


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



                                       38


                          CERTIFICATE OF AUTHENTICATION


         This is one of the Debentures of the series of Debentures  described in
the within-mentioned Indenture.

THE FIRST NATIONAL BANK OF
CHICAGO
as Trustee                                  or       as Authentication Agent


By                                              By
  --------------------------------                 -----------------------------
   Authorized Signatory                             Authorized Signatory


                                       39



                         (FORM OF REVERSE OF DEBENTURE)


         This Debenture is one of a duly authorized  series of Debentures of the
Company (herein  sometimes  referred to as the  "DEBENTURES"),  specified in the
Indenture,  all issued or to be issued in one or more series  under and pursuant
to an Indenture  dated as of March 1, 1997 duly executed and  delivered  between
the  Company  and  The  First  National  Bank of  Chicago,  a  national  banking
association,  as Trustee (herein referred to as the "TRUSTEE"),  as supplemented
by the Second  Supplemental  Indenture  dated as of October 29, 1997 between the
Company and the Trustee (said  Indenture as so  supplemented  being  hereinafter
referred  to  as  the  "INDENTURE"),  to  which  Indenture  and  all  indentures
supplemental  thereto  reference is hereby made for a description of the rights,
limitations  of rights,  obligations,  duties and  immunities  thereunder of the
Trustee,  the  Company  and the  holders of the  Debentures,  and, to the extent
specifically set forth in the Indenture,  the holders of Senior and Subordinated
Debt and Preferred Securities. By the terms of the Indenture, the Debentures are
issuable  in  series  which may vary as to  amount,  date of  maturity,  rate of
interest  and in other  respects as in the  Indenture  provided.  This series of
Debentures is designated the 5.50% Junior  Subordinated  Debentures due 2012 and
is  limited  in  aggregate   principal   amount  as  specified  in  said  Second
Supplemental Indenture.

         Except as provided in the next  paragraph,  the  Debentures  may not be
redeemed by the Company prior to September 30, 2000.  The Company shall have the
right to redeem this Debenture at the option of the Company,  without premium or
penalty,  in whole or in part at any time on or  after  September  30,  2000 (an
"OPTIONAL  REDEMPTION"),  upon not less than 30 nor move than 60 days  notice to
the Holder of the Series 5.50% Debentures, at the following prices (as expressed
as  percentages  of the  principal  amount  of the  Debentures)  (the  "OPTIONAL
REDEMPTION PRICE"), together with any accrued but unpaid interest, including any
Compounded Interest, if any, to, but including, the date of such redemption,  if
redeemed during the 12-month period beginning September 30:


                       YEAR                  REDEMPTION PRICE
                       ----                  ----------------
                       2000                      103.438%
                       2001                      102.750%
                       2002                      102.063%
                       2003                      101.375%
                       2004                      100.688%

and 100% if redeemed on or after September 30, 2005.



                                       40


         If the Series 5.50%  Debentures  are  redeemed on any Interest  Payment
Date,  accrued and unpaid  interest shall be payable to Holders of record on the
relevant record date.

         The  Company  may not  redeem any Series  5.50%  Debentures  unless all
accrued and unpaid interest thereon,  including Compounded Interest, if any, has
been  paid  for all  quarterly  periods  terminating  on or prior to the date of
notice of  redemption.  So long as the  corresponding  Preferred  Securities are
outstanding,  the proceeds from the  redemption  of the Series 5.50%  Debentures
will be used to redeem the Preferred Securities.

         If the Debentures are only partially  redeemed by the Company  pursuant
to an Optional Redemption, the Debentures will be redeemed pro rata or by lot or
by any  other  method  utilized  by the  Trustee;  provided  if,  at the time of
redemption,  the Debentures are registered as a Global Debenture, the Depository
shall  determine the principal  amount of such Debentures held by each holder of
Debentures to be redeemed in accordance with its customary procedures.

         If, at any  time,  a Tax Event (as  defined  below)  shall  occur or be
continuing after receipt of a Dissolution Tax Opinion (as defined below) and (i)
the  Regular  Trustees  and the  Company  shall  have  received  an  opinion  (a
"REDEMPTION  TAX OPINION") of a nationally  recognized  independent  tax counsel
experienced in such matters that, as a result of a Tax Event, there is more than
an  insubstantial  risk that the Company would be precluded  from  deducting the
interest on the Debentures for United States federal income tax purposes even if
the  Debentures  were  distributed  to the holders of Preferred  Securities  and
Common  Securities in liquidation  of such holder's  interest in AES Trust II as
set forth in the  Declaration  of Trust or (ii) the Regular  Trustees shall have
been  informed by such tax  counsel  that a No  Recognition  Opinion (as defined
below)  cannot be delivered to AES Trust II, the Company shall have the right at
any time,  upon not less than 30 nor more than 60 days'  notice,  to redeem  the
Debentures  in  whole  or in  part  for  cash at a  price  equal  to 100% of the
principal amount thereof, together with any accrued and unpaid interest thereon,
including  Compounded Interest if any, to, but excluding the date of redemption,
within 90 days  following the occurrence of such Tax Event;  provided,  however,
that,  if at the time there is available to the Company or the Regular  Trustees
on behalf of AES  Trust II the  opportunity  to  eliminate,  within  such 90 day
period, the Tax Event by taking some ministerial action ("MINISTERIAL  ACTION"),
such as filing a form or making an  election,  or  pursuing  some other  similar
reasonable measure,  which has no adverse effect on AES Trust II, the Company or
the holders of the Preferred Securities,  the Company or the Regular Trustees on
behalf  of AES Trust II will  pursue  such  measure  in lieu of  redemption  and
provided further that the Company shall have



                                       41


no right to redeem the  Debentures  while the Regular  Trustees on behalf of AES
Trust II are pursuing any such Ministerial Action.

         "TAX EVENT" means that the Company and the Regular  Trustees shall have
obtained an opinion of nationally recognized independent tax counsel experienced
in such  matters (a  "DISSOLUTION  TAX  OPINION") to the effect that on or after
October 23, 1997,  as a result of (a) any  amendment  to, or change in, the laws
(or  any  regulations   thereunder)  of  the  United  States  or  any  political
subdivision  or taxing  authority  thereof or therein,  (b) any amendment to, or
change in, an  interpretation  or application of any such laws or regulations by
any  legislative  body,  court,  governmental  agency  or  regulatory  authority
(including the enactment of any  legislation and the publication of any judicial
decision or regulatory  determination),  (c) any interpretation or pronouncement
that  provides  for a position  with  respect to such laws or  regulations  that
differs from the theretofore generally accepted position or (d) any action taken
by any governmental agency or regulatory authority, which amendment or change is
enacted,   promulgated,   issued  or  effective  or  which   interpretation   or
pronouncement  is issued or announced or which action is taken,  in each case on
or after October 23, 1997, there is more than an insubstantial risk that (i) AES
Trust II is, or will be within 90 days of the date  thereof,  subject  to United
States  federal  income tax with  respect to income  accrued or  received on the
Debentures, (ii) AES Trust II is, or will be within 90 days of the date thereof,
subject to more than a de minimis amount of taxes,  duties or other governmental
charges  or  (iii)  interest  payable  by the  Company  to AES  Trust  II on the
Debentures is not, or within 90 days of the date thereof will not be, deductible
by the Company for United States federal income tax purposes.

         "NO  RECOGNITION  OPINION" means an opinion of a nationally  recognized
independent tax counsel  experienced in such matters,  which opinion may rely on
any then applicable published revenue ruling of the Internal Revenue Service, to
the effect that the holders of the Preferred  Securities  will not recognize any
gain or loss for United  States  federal  income tax  purposes  as a result of a
dissolution  of AES Trust II and  distribution  of the Debentures as provided in
the Declaration of Trust.

         If the Debentures are only partially  redeemed by the Company  pursuant
to an Optional  Redemption or as a result of a Tax Event as described above, the
Debentures will be redeemed pro rata or by lot or in some other equitable manner
determined  by  the  Trustee.   Notwithstanding  the  foregoing,  if  a  partial
redemption  of the  Debentures  would result in the  delisting of the  Preferred
Securities by any national  securities  exchange or other  organization on which
the Preferred  Securities are then listed, the Company shall not be permitted to
effect such partial redemption and will only redeem the Debentures in whole.



                                       42


         In the  event of  redemption  of this  Debenture  in part  only,  a new
Debenture or Debentures  of this series for  unredeemed  portion  hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.

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

         The Indenture  contains  provisions  for  defeasance at any time of the
entire  indebtedness  of this  Debenture  upon  compliance  by the Company  with
certain conditions set forth therein.

         The  Indenture  contains  provisions  permitting  the  Company  and the
Trustee,  with the  consent  of the  Holders  of not  less  than a  majority  in
aggregate principal amount of the Debentures of each series affected at the time
outstanding,  as defined  in the  Indenture  (and,  in the case of any series of
Debentures  held as trust  assets of an AES Trust  and with  respect  to which a
Security Exchange has not theretofore  occurred,  such consent of holders of the
Preferred  Securities  and the  Common  Securities  of such AES Trust) as may be
required  under  the   Declaration  of  Trust  of  such  AES  Trust  to  execute
supplemental  indentures for the purpose of adding any provisions to or changing
in any manner or  eliminating  any of the  provisions of the Indenture or of any
supplemental  indenture  or of modifying in any manner the rights of the Holders
of the Debentures;  provided, however, that no such supplemental indenture shall
(i) extend the fixed  maturity of any  Debentures  of any series,  or reduce the
principal  amount  thereof,  or reduce the rate or extend the time of payment of
interest  thereon,  or reduce any premium  payable upon the redemption  thereof,
without the consent of the holder of each  Debenture  so affected or (ii) reduce
the  aforesaid  percentage of  Debentures,  the holders of which are required to
consent to any such supplemental  indenture,  without the consent of the holders
of each  Debenture  (and, in the case of any series of Debentures  held as trust
assets of an AES Trust and with  respect  to which a Security  Exchange  has not
theretofore  occurred,  such consent of the holders of the Preferred  Securities
and the  Common  Securities  of such AES  Trust  as may be  required  under  the
Declaration of Trust of such AES Trust) then  outstanding and affected  thereby.
The Indenture also contains  provisions  permitting the Holders of a majority in
aggregate principal amount of the Debentures of a series at the time outstanding
affected thereby (subject, in the case of any series of Debentures held as trust
assets of an AES Trust and with respect to which a  Securities  Exchange has not
theretofore  occurred,  to such consent of holders of Preferred  Securities  and
Common  Securities of such AES Trust as may be required under the Declaration of
Trust of such AES  Trust),  on behalf of the Holders of the  Debentures  of such
series, to waive any past default in the



                                       43


performance of any of the covenants  contained in the Indenture,  or established
pursuant to the  Indenture  with respect to such series,  and its  consequences,
except a default in the  payment of the  principal  of or  premium,  if any,  or
interest on any of the Debentures of such series.  Any such consent or waiver by
the  registered  Holder of this  Debenture  (unless  revoked as  provided in the
Indenture)  shall be conclusive and binding upon such Holder and upon all future
Holders and owners of this  Debenture  and of any  Debenture  issued in exchange
herefor or in place hereof  (whether by  registration of transfer or otherwise),
irrespective  of whether or not any  notation of such  consent or waiver is made
upon this Debenture.

         Subject to Section 13.12 of the Indenture,  no reference  herein to the
Indenture (other than such Section) and no provision of this Debenture or of the
Indenture shall alter or impair the obligation of the Company, which is absolute
and unconditional,  to pay the principal of and premium, if any, and interest on
this  Debenture  at the time and  place  at the  rate  and in the  money  herein
prescribed.

         So long as the  Company is not in default in the payment of interest on
the Debentures, the Company shall have the right, at any time during the term of
the Debentures,  from time to time to extend the interest payment period of such
Debentures for up to 20 consecutive  quarterly  interest  periods (the "EXTENDED
INTEREST PAYMENT PERIOD"),  at the end of which period the Company shall pay all
interest then accrued and unpaid  (together with interest thereon at the rate of
5.50% per annum to the extent permitted by applicable law, compounded  quarterly
("COMPOUNDED INTEREST"));  provided that no Extended Interest Payment Period may
extend  beyond the date of maturity or any  redemption  date of the  Debentures.
During such Extended  Interest  Payment  Period the Company shall not declare or
pay any  dividend on, or redeem,  purchase,  acquire or make a  distribution  or
liquidation payment with respect to, any of its common stock or preferred stock,
or make any guarantee payments with respect thereto, provided that the foregoing
will not apply to any stock  dividends,  paid by the  Company  in Common  Stock.
Prior to the  termination  of any such Extended  Interest  Payment  Period,  the
Company may pay all or any portion of the interest  accrued on the Debentures on
any Interest  Payment  Date to holders of record on the regular  record date for
such  Interest  Payment Date or from time to time further  extend such  Extended
Interest  Payment  Period,  provided  that such  Period  together  with all such
further  extensions  thereof shall not exceed 20 consecutive  quarterly interest
periods.  At the  termination of any such Extended  Interest  Payment Period and
upon the payment of all  accrued and unpaid  interest  then due,  together  with
Compounded  Interest,  the Company may select a new  Extended  Interest  Payment
Period,  subject to the foregoing  requirements.  No interest on this  Debenture
shall be due and payable during an Extended  Interest Payment Period,  except at
the end thereof.  At the end of the Extended Interest Payment Period the Company
shall pay all  interest  accrued  and  unpaid on the  Debentures  including  any
Compounded



                                       44


Interest  which shall be payable to the holders of the Debentures in whose names
the Debentures are registered in the Debenture register on the first record date
after the end of the Extended Interest Payment Period.

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

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

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

         The  Holder of any  Debenture  has the right,  exercisable  at any time
through the close of business  (New York time) on September 30, 2012 (or, in the
case of a Debenture called for redemption, prior to the close of business on the
Business  Day  prior to the  corresponding  redemption  date),  to  convert  the
principal amount thereof (or any portion thereof that is an integral multiple of
$50) into shares of Common Stock at the initial conversion rate of 0.8914 shares
of Common Stock



                                       45


for each  Debenture  (equivalent  to a  Conversion  Price of $56.09 per share of
Common Stock), subject to adjustment under certain circumstances.

         To  convert  a  Debenture,  a  Holder  must  (a)  complete  and  sign a
conversion notice  substantially in the form attached hereto,  (b) surrender the
Debenture  to a  Conversion  Agent,  (c)  furnish  appropriate  endorsements  or
transfer  documents if required by the Conversion Agent and (d) pay any transfer
or similar tax, if required.  If a Debenture is surrendered for conversion after
the close of business on any regular  record date for payment of a  Distribution
and before the  opening of business on the  corresponding  Distribution  payment
date, then,  notwithstanding  such conversion,  the Distribution payable on such
Distribution  payment  date will be paid in cash to the person in whose name the
Debenture is registered at the close of business on such record date, and (other
than a  Debenture  or a  portion  of a  Debenture  called  for  redemption  on a
redemption  date  occurring  after  such  record  date  and on or  prior to such
Distribution  payment date) when so surrendered  for  conversion,  the Debenture
must be accompanied by payment of an amount equal to the Distribution payable on
such Distribution payment date. The number of shares issuable upon conversion of
a Debenture is  determined  by dividing the  principal  amount of the  Debenture
converted  by the  Conversion  Price  in  effect  on  the  Conversion  Date.  No
fractional  shares will be issued upon  conversion but a cash adjustment will be
made for any  fractional  interest.  The  outstanding  principal  amount  of any
Debenture  shall be  reduced  by the  portion of the  principal  amount  thereof
converted into shares of Common Stock.

         [If  CERTIFICATED  DEBENTURES  -- The  Debentures  of this  series  are
issuable only in registered form without coupons in denominations of $50 and any
integral  multiple  thereto.] [If GLOBAL  DEBENTURE -- This Global  Debenture is
exchangeable   for   Debentures  in  definitive   form  under  certain   limited
circumstances  set forth in the  Indenture.  Debentures of this series so issued
are issuable only in registered form without coupons in  denominations of $50 or
any  integral  multiple  thereof.] As provided in the  Indenture  and subject to
certain  limitations  [If GLOBAL  DEBENTURE  -- herein  and]  therein set forth,
Debentures  of this series [If GLOBAL  DEBENTURE -- so issued] are  exchangeable
for a like  aggregate  principal  amount  of  Debentures  of  this  series  of a
different authorized  denomination,  as requested by the Holder surrendering the
same.

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



                                       46


                          [FORM OF ELECTION TO CONVERT]
                               ELECTION TO CONVERT


To: The AES Corporation

         The undersigned  owner of this Debenture hereby  irrevocably  exercises
the option to convert this  Debenture,  or the portion  below  designated,  into
Common  Stock  of THE AES  CORPORATION,  in  accordance  with  the  terms of the
Indenture  referred to in this  Debenture,  and directs that the shares issuable
and  deliverable  upon  conversion,  together  with  any  check in  payment  for
fractional  shares,  be issued in the name of and delivered to the  undersigned,
unless a different name has been indicated in the  assignment  below.  If shares
are to be  issued  in the  name of a person  other  than  the  undersigned,  the
undersigned will pay all transfer taxes payable with respect thereto.

Date: _________, ____

         in whole                     Portions of Debenture to be converted ($50
                                      or integral multiples thereof):
                                      $__________


                                -------------------------------
                                Signature (for conversion only)

                                      Please Print or Typewrite Name and
                                      Address, Including Zip Code, and Social
                                      Security or Other Identifying Number

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

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

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

                                            Signature Guarantee:1____
- -------------------
1    Signature must be guaranteed by an "eligible guarantor institution" that is
     a bank,  stockbroker,  savings and loan association or credit union meeting
     the  requirements  of the  Conversion  Agent,  which  requirements  include
     membership of  participation  in the Securities  Transfer Agents  Medallion
     Program  ("STAMP") or such other  "signature  guarantee  program" as may be
     determined by the Conversion Agent in addition to, or in substitution  for,
     STAMP,  all in accordance  with the Securities and Exchange Act of 1934, as
     amended.



                                       47


                                   ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Debenture to:

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

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

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


        (Insert assignee's social security or tax identification number)


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

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

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

- --------------------------------------------------------------------------------
                    (Insert address and zip code of assignee)

and irrevocably appoints _______________________________________________________

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

___________________________________________________ agent to transfer
this Debenture on the books of the Trust.  The agent may  substitute  another to
act for him or her.

Date:_______________________________________

Signature:_________________________________________
         (Sign exactly as your name appears on the other side of this Debenture)

Signature
Guarantee2:_________________________________________________





- -------------------
2    Signature must be guaranteed by an "eligible guarantor institution" that is
     a bank,  stockbroker,  savings and loan association or credit union meeting
     the  requirements  of the  Conversion  Agent,  which  requirements  include
     membership of  participation  in the Securities  Transfer Agents  Medallion
     Program  ("STAMP") or such other  "signature  guarantee  program" as may be
     determined by the Conversion Agent in addition to, or in substitution  for,
     STAMP,  all in accordance  with the Securities and Exchange Act of 1934, as
     amended.



                                       48


                       FORM OF CERTIFICATE TO BE DELIVERED
              IN CONNECTION WITH (I) TRANSFERS OF INTERESTS IN THE
                   TEMPORARY REGULATION S GLOBAL DEBENTURE AND
                 (II) TRANSFERS OF INTEREST TO NON-U.S. PERSONS


The First National Bank of Chicago
One First National Plaza, Suite 0126
Chicago, Illinois 60670-0126

Attention: Corporate Trust Administration

              Re:  The AES Corporation (the "Company")
                   Series 5.50% Debentures

Dear Sirs or Mesdames:

         In  connection  with our  proposed  sale of the number of Series  5.50%
Debentures  designated  below, the undersigned owner confirms that such sale has
been  effected  pursuant  to and in  accordance  with  Regulation  S  under  the
Securities Act of 1933, as amended, and, accordingly, represents that:

         (1) the offer of the Series 5.50%  Debentures  was not made to a person
in the United States;

         (2) at the  time the buy  order  was  originated,  the  transferee  was
outside the United States or we and any person  acting on our behalf  reasonably
believed that the transferee was outside the United States;

         (3) no  directed  selling  efforts  have been made by us in the  United
States in  contravention  of the  requirements  of Rule 903(b) or Rule 904(b) of
Regulation S, as applicable; and

         (4) the  transaction  is not  part of a plan or  scheme  to  evade  the
registration requirements of the U.S. Securities Act of 1933.



                                       49



         You and the  Company  are  entitled  to rely upon this  letter  and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any  administrative  or legal  proceedings  or  official  inquiry  with
respect to the matters covered hereby.  Terms used in this  certificate have the
meanings set forth in Regulation S.

         Date: ___________, ____


                                            Very truly yours,

                                            [Name of Transferor]


                                            By: 
                                               ----------------------
                                               Authorized Signature


                                            Number of Series 5.50% Debentures to
                                              be sold:


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


                                            Please Print or  Typewrite  Name and
                                            Address,  Including  Zip  Code,  and
                                            Social Security or Other Identifying
                                            Number:

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

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

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



                                       50


                           ACCREDITED INVESTOR LETTER

                   , 199



The First National Bank of
 Chicago
One First National Plaza
Chicago, Illinois 60670-0126

Dear Sirs:

         In connection with our proposed  transfer of 5.50% Junior  Subordinated
Debentures due 2012 described  below (the  "Debentures")  of The AES Corporation
(the "Issuer"), we confirm that:

         1.   We have received a copy of the Offering  Memorandum (the "Offering
              Memorandum"),  dated October 24, 1997,  relating to the Debentures
              and the  undersigned  agrees  to be bound by,  and not to  resell,
              pledge or otherwise  transfer the Debentures  except in compliance
              with, such  restrictions  and conditions and the Securities Act of
              1933, as amended (the "Securities Act").

         2.   We understand  that any  subsequent  transfer of the Debentures is
              subject to certain  restrictions  and  conditions set forth in the
              Indenture as amended by the second supplemental indenture relating
              to the Debentures and the  undersigned  agrees to be bound by, and
              not to resell,  pledge or otherwise transfer the Debentures except
              in compliance  with,  such  restrictions  and  conditions  and the
              Securities Act of 1933, as amended (the "Securities Act").

         3.   We understand  that the offer and the sale of the  Debentures  has
              not  been  registered  under  the  Securities  Act,  and  that the
              Debentures  may not be offered or sold except as  permitted in the
              following  sentence.  We agree, on our own behalf and on behalf of
              any accounts for which we are acting as hereinafter  stated,  that
              if we should sell any  Debentures or Common Stock  (together,  the
              "Securities")  prior  to  the  expiration  of the  holding  period
              applicable  to sales of the security  evidenced  hereby under Rule
              144(k) under the Securities Act (or any successor  provision),  we
              will do so only (A) to The AES Corporation  (the "Company") or any
              subsidiary  thereof,  (B) inside the United  States in  accordance
              with Rule 144A under the Securities Act to a



                                       51



              "qualified  institutional buyer" (as defined therein),  (C) inside
              the United States to an  institutional  "accredited  investor" (as
              defined  below)  that,  prior to such  transfer,  furnishes to the
              Trustee a signed letter  containing  certain  representations  and
              agreements  relating  to  the  restrictions  on  transfer  of  the
              Debenture  (the  form of which  letter  can be  obtained  from the
              Trustee) and, if such transfer is in respect of Debenture  with an
              aggregate liquidation preference of less than $250,000, an opinion
              of counsel  acceptable  to the  Company  that such  transfer is in
              compliance  with the Securities Act, (D) outside the United States
              in  accordance  with the Rule 904  under  the  Securities  Act (E)
              pursuant to the exemption from  registration  provided by Rule 144
              under the  Securities  Act (if  available)  or (F)  pursuant to an
              effective  registration statement under the Securities Act, and we
              further  agree to  provide  to any  person  purchasing  any of the
              Debenture from us a notice advising such purchaser that resales of
              the Debenture are restricted as stated herein.

         4.   We understand  that, on any proposed resale of any Securities,  we
              will be  required  to furnish to the Issuer and the  Trustee  such
              certifications, legal opinions and other information as the Issuer
              and the  Trustee  may  reasonably  require  to  confirm  that  the
              proposed sale complies with the foregoing restrictions. We further
              understand that the Securities  purchased by us will bear a legend
              to the foregoing effect.

         5.   We are a institutional  "accredited  investor" (as defined in rule
              501(a)(1),  (2), (3) or (7) of  Regulation D under the  Securities
              Act) and have such  knowledge  and  experience  in  financial  and
              business  matters as to be capable  of  evaluating  the merits and
              risks of our  investment in the Preferred  Securities,  and we and
              any  accounts  for which we are  acting  are each able to bear the
              economic risks of our or their investment.

         6.   We are acquiring the Debenture purchased by us for our own account
              for  one or more  accounts  (each  of  which  is an  institutional
              "accredited  investor")  as to  each of  which  we  exercise  sole
              investment discretion.

         The Issuer and the  Trustee  are  entitled to rely upon this letter and
are  irrevocably  authorized  to  produce  this  letter or a copy  hereof to any
interested party in any  administrative or legal proceedings or official inquiry
with respect to the matters covered hereby.



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                                                     Very truly yours,


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



                                       53



                                    ARTICLE 7
                    ORIGINAL ISSUE OF SERIES 5.50% DEBENTURES

         SECTION 7.01. Except as provided in Section 1.01 and this Section 7.01,
Series 5.50% Debentures in the aggregate  principal amount equal to $309,278,400
may, upon execution of this Second  Supplemental  Indenture,  be executed by the
Company and delivered to the Trustee for  authentication,  and the Trustee shall
thereupon  authenticate  and make  available for delivery said  Debentures to or
upon the written order of the Company, signed by its Chairman, its President, or
any Vice  President  and its  Treasurer or an Assistant  Treasurer,  without any
further  action by the Company.  Upon exercise of the  overallotment  option set
forth in the Underwriting  Agreement,  additional Series 5.50% Debentures in the
aggregate  principal  amount of up to $46,391,800 may be executed by the Company
and delivered to the Trustee for authentication, and the Trustee shall thereupon
authenticate  and make  available  for  delivery  said Series  5.50%  Debentures
executed  as  aforesaid  by the  Company,  to or upon the  written  order of the
Company,  which  order shall be  accompanied  by  evidence  satisfactory  to the
Trustee that the overallotment option has been exercised.



                                    ARTICLE 8
                            MISCELLANEOUS PROVISIONS

         SECTION  8.01.  Except as otherwise  expressly  provided in this Second
Supplemental  Indenture  or in the form of Series  5.50%  Debenture or otherwise
clearly  required by the context hereof or thereof,  all terms used herein or in
said form of Series 5.50% Debenture that are defined in the Indenture shall have
the several meanings respectively assigned to them thereby.

         SECTION  8.02.  The   Indenture,   as   supplemented   by  this  Second
Supplemental Indenture,  is in all respects ratified and confirmed.  This Second
Supplemental  Indenture  shall be deemed part of the Indenture in the manner and
to the extent herein and therein provided.

         SECTION 8.03. The recitals herein contained are made by the Company and
not  by  the  Trustee,  and  the  Trustee  assumes  no  responsibility  for  the
correctness  thereof.  The Trustee makes no representation as to the validity or
sufficiency of this Second Supplemental Indenture.

         SECTION 8.04. 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.



                                       54


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


                                            THE AES CORPORATION


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

Attest:



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

                                            THE FIRST NATIONAL BANK OF
                                              CHICAGO, as Trustee


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


Attest:



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



                                       55