Exhibit 4.5







                         ARIZONA PUBLIC SERVICE COMPANY

                                       TO

                              THE BANK OF NEW YORK

                                     Trustee



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


                                    Indenture

                          Dated as of November 15, 1996


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


                               (For Senior Notes)








         ..............................................................
    Certain Sections of this Indenture relating to Sections 310 through 318,
                 inclusive, of the Trust Indenture Act of 1939:

Trust Indenture
  Act Section                                                 Indenture Section

ss. 310 (a) (1)    .........................................  709
        (a) (2)    .........................................  709
        (a) (3)    .........................................  Not Applicable
        (a) (4)    .........................................  Not Applicable
        (b)        .........................................  708
                                                              710
ss. 311 (a)        .........................................  713
        (b)        .........................................  713
ss. 312 (a)        .........................................  801
                                                              802
        (b)        .........................................  802
        (c)        .........................................  802
ss. 313 (a)        .........................................  803
        (b)        .........................................  803
        (c)        .........................................  803
        (d)        .........................................  803
ss. 314 (a)        .........................................  804
        (a) (4)    .........................................  101
                                                              1104
        (b)        .........................................  1105
        (c) (1)    .........................................  102
        (c) (2)    .........................................  102
        (c) (3)    .........................................  Not Applicable
        (d)        .........................................  102
                   .........................................  404
        (e)        .........................................  102
ss. 315 (a)        .........................................  701
        (b)        .........................................  702
        (c)        .........................................  701
        (d)        .........................................  701
        (e)        .........................................  614
ss. 316 (a)        .........................................  101
        (a) (1)(A) .........................................  602
                                                              612
        (a) (1)(B) .........................................  613
        (a) (2)    .........................................  Not Applicable
        (b)        .........................................  608
        (c)        .........................................  104
ss. 317 (a) (1)    .........................................  603
        (a) (2)    .........................................  604
        (b)        .........................................  1103
ss. 318 (a)        .........................................  107

- -------------------
NOTE: This  reconciliation and tie shall not, for any purpose, be deemed to be a
part of the Indenture.

                                                               TABLE OF CONTENTS
                                   ----------

                                                                            PAGE
                                                                            ----
PARTIES
RECITALS OF THE COMPANY


                                   ARTICLE ONE

             DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION


                                                                                                    
SECTION 101.       Definitions:
                   Act.................................................................................  2
                   Affiliate...........................................................................  2
                   Authenticating Agent................................................................  2
                   Board of Directors..................................................................  2
                   Board Resolution....................................................................  2
                   Business Day........................................................................  2
                   Commission..........................................................................  2
                   Company.............................................................................  2
                   Company Request; Company Order......................................................  2
                   Corporate Trust Office..............................................................  2
                   Corporation.........................................................................  2
                   Covenant Defeasance.................................................................  3
                   Defaulted Interest..................................................................  3
                   Defeasance..........................................................................  3
                   Depositary..........................................................................  3
                   Event of Default....................................................................  3
                   Exchange Act........................................................................  3
                   Expiration Date.....................................................................  3
                   Expert..............................................................................  3
                   First Mortgage.....................................................................   3
                   First Mortgage Bonds................................................................  3
                   Global Note.........................................................................  3
                   Holder..............................................................................  3
                   Indenture...........................................................................  3
                   Interest............................................................................  3
                   Interest Payment Date...............................................................  3
                   Investment Company Act..............................................................  4
                   Maturity............................................................................  4
                   Mortgage Trustee....................................................................  4
                   Notes...............................................................................  4
                   Note Register; Note Registrar.......................................................  4
                   Notice of Default...................................................................  4
                   Officers' Certificate...............................................................  4
                   Opinion of Counsel..................................................................  4
                   Original Issue Discount Note........................................................  4
                   Outstanding.........................................................................  4
                   Paying Agent........................................................................  5
                   Person..............................................................................  5
                   Place of Payment....................................................................  5
                   Predecessor Note....................................................................  5
                   Redemption Date.....................................................................  5
                   Redemption Price....................................................................  6
                   Regular Record Date.................................................................  6
                   Release Date........................................................................  6
                   Responsible Officer.................................................................  6
                   Securities Act......................................................................  6
                   Senior Note First Mortgage Bonds....................................................  6
                   Special Record Date.................................................................  6
                   Stated Maturity.....................................................................  6
                   Subsidiary..........................................................................  6 



                                                                                                     
                   Trust Indenture Act.................................................................  6
                   Trustee.............................................................................  6
                   U.S. Government Obligation..........................................................  7
                   Vice President......................................................................  7
SECTION 102.  Compliance Certificates and Opinions.....................................................  7
SECTION 103.  Form of Documents Delivered to Trustee...................................................  7
SECTION 104.  Acts of Holders; Record Dates............................................................  8
SECTION 105.  Notices, Etc., to Trustee and Company.................................................... 10
SECTION 106.  Notice to Holders; Waiver................................................................ 10
SECTION 107.  Conflict with Trust Indenture Act........................................................ 11
SECTION 108.  Effect of Headings and Table of Contents................................................. 11
SECTION 109.  Successors and Assigns................................................................... 11
SECTION 110.  Separability Clause...................................................................... 11
SECTION 111.  Benefits of Indenture.................................................................... 11
SECTION 112.  Governing Law............................................................................ 11
SECTION 113.  Legal Holidays                                                                            12


                                            ARTICLE TWO

                                            NOTE FORMS

SECTION 201.  Forms Generally.......................................................................... 12
SECTION 202.  Form of Face of Note..................................................................... 12
SECTION 203.  Form of Reverse of Note.................................................................. 14
SECTION 204.  Form of Legend for Global Notes.......................................................... 18
SECTION 205.  Form of Trustee's Certificate of Authentication.......................................... 19

                                             ARTICLE THREE

                                             THE NOTES

SECTION 301.  Amount Unlimited; Issuable in Series..................................................... 19
SECTION 302.  Denominations............................................................................ 22
SECTION 303.  Execution, Authentication, Delivery and Dating........................................... 22
SECTION 304.  Temporary Notes.......................................................................... 24
SECTION 305.  Registration, Registration of Transfer and Exchange...................................... 24
SECTION 306.  Mutilated, Destroyed, Lost and Stolen Notes.............................................. 26
SECTION 307.  Payment of Interest; Interest Rights Preserved........................................... 26
SECTION 308.  Persons Deemed Owners.................................................................... 27
SECTION 309.  Cancellation............................................................................. 28
SECTION 310.  Computation of Interest.................................................................. 28
SECTION 311.  CUSIP Numbers                                                                             28



                                                                                                     
SECTION 312.  Payments on Senior Note First Mortgage Bonds............................................. 28

                                              ARTICLE FOUR

                                 SENIOR NOTE FIRST MORTGAGE BONDS

SECTION 401.  Acceptance of Senior Note First Mortgage Bonds........................................... 29
SECTION 402.  Terms of Senior Note First Mortgage Bonds................................................ 29
SECTION 403.  Senior Note First Mortgage bonds as Security for Notes................................... 29
SECTION 404.  Fair Value Certificate................................................................... 30
SECTION 405.  Senior Note First Mortgage Bonds Held by the Trustee..................................... 31
SECTION 406.  No Transfer of Senior Note First Mortgage bonds; Exception............................... 31
SECTION 407.  Delivery to the Company of all Senior Note First Mortgage bonds.......................... 31
SECTION 408.  Further Assurances....................................................................... 32
SECTION 409.  Exchange and Surrender of Senior Note First Mortgage bonds............................... 32

                                              ARTICLE FIVE

                                    SATISFACTION AND DISCHARGE

SECTION 501.  Satisfaction and Discharge of Indenture.................................................. 33
SECTION 502.  Application of Trust Money............................................................... 34

                                            ARTICLE SIX

                                             REMEDIES

SECTION 601.  Events of Default........................................................................ 34
SECTION 602.  Acceleration of Maturity; Rescission and Annulment....................................... 36
SECTION 603.  Collection of Indebtedness and Suits for
                       Enforcement by Trustee.......................................................... 37
SECTION 604.  Trustee May File Proofs of Claim......................................................... 37
SECTION 605.  Trustee May Enforce Claims Without Possession
                       of Notes........................................................................ 38
SECTION 606.  Application of Money Collected........................................................... 38
SECTION 607.  Limitation on Suits...................................................................... 38
SECTION 608.  Unconditional Right of Holders to Receive Principal,
                       Premium and Interest............................................................ 39
SECTION 609.  Restoration of Rights and Remedies....................................................... 39
SECTION 610.  Rights and Remedies Cumulative........................................................... 40
SECTION 611.  Delay or Omission Not Waiver............................................................. 40
SECTION 612.  Control by Holders....................................................................... 40
SECTION 613.  Waiver of Past Defaults.................................................................. 40
SECTION 614.  Undertaking for Costs.................................................................... 41
SECTION 615.  Waiver of Usury, Stay or Extension Laws.................................................. 41

                                           ARTICLE SEVEN

                                            THE TRUSTEE

SECTION 701.  Certain Duties and Responsibilities...................................................... 41
SECTION 702.  Notice of Defaults....................................................................... 42
SECTION 703.  Certain Rights of Trustee................................................................ 42
SECTION 704.  Not Responsible for Recitals or Issuance of Notes........................................ 43
SECTION 705.  May Hold Notes........................................................................... 43
SECTION 706.  Money Held in Trust...................................................................... 43
SECTION 707.  Compensation and Reimbursement........................................................... 44
SECTION 708.  Conflicting Interests.................................................................... 44
SECTION 709.  Corporate Trustee Required; Eligibility.................................................. 45
SECTION 710.  Resignation and Removal; Appointment of Successor........................................ 45
SECTION 711.  Acceptance of Appointment by Successor................................................... 46
SECTION 712.  Merger, Conversion, Consolidation or Succession
                        to Business.................................................................... 47
SECTION 713.  Preferential Collection of Claims Against Company........................................ 48



                                                                                                     
SECTION 714.  Appointment of Authenticating Agent...................................................... 48

                                           ARTICLE EIGHT

                         HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 801.  Company to Furnish Trustee Names and Addresses
                       of Holders...................................................................... 50
SECTION 802.  Preservation of Information; Communications
                       to Holders...................................................................... 50
SECTION 803.  Reports by Trustee....................................................................... 50
SECTION 804.  Reports by Company....................................................................... 51

                                           ARTICLE NINE

                       CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 901.  Company May Consolidate, Etc., Only on
                        Certain Terms.................................................................. 51
SECTION 902.  Successor Substituted.................................................................... 52

                                            ARTICLE TEN

                                      SUPPLEMENTAL INDENTURES

SECTION 1001.  Supplemental Indentures Without Consent of Holders...................................... 53
SECTION 1002.  Supplemental Indentures With Consent of Holders......................................... 54
SECTION 1003.  Execution of Supplemental Indentures.................................................... 55
SECTION 1004.  Effect of Supplemental Indentures....................................................... 55
SECTION 1005.  Conformity with Trust Indenture Act..................................................... 55
SECTION 1006.  Reference in Securities to Supplemental Indentures...................................... 55

                                          ARTICLE ELEVEN

                                             COVENANTS

SECTION 1101.  Payment of Principal, Premium and Interest.............................................. 56
SECTION 1102.  Maintenance of Office or Agency......................................................... 56
SECTION 1103.  Money for Notes Payments to Be Held in Trust............................................ 56
SECTION 1104.  Statement by Officers as to Default..................................................... 57
SECTION 1105.  Recording, Filing, etc.; Opinions of Counsel............................................ 58
SECTION 1106.  Existence............................................................................... 58
SECTION 1107.  Maintenance of Properties............................................................... 59
SECTION 1108.  Payment of Taxes and Other Claims....................................................... 59
SECTION 1109.  Waiver of Certain Covenants............................................................. 59
SECTION 1110.  Calculation of Original Issue Discount.................................................. 59

                                          ARTICLE TWELVE

                                        REDEMPTION OF NOTES

SECTION 1201.  Applicability of Article................................................................ 60
SECTION 1202.  Election to Redeem; Notice to Trustee................................................... 60
SECTION 1203.  Selection by Trustee of Notes to Be Redeemed............................................ 60
SECTION 1204.  Notice of Redemption.................................................................... 61
SECTION 1205.  Deposit of Redemption Price............................................................. 62
SECTION 1206.  Notes Payable on Redemption Date........................................................ 62
SECTION 1207.  Notes Redeemed in Part.................................................................. 62



                                         ARTICLE THIRTEEN

                                           SINKING FUNDS
                                                                                                     
SECTION 1301.  Applicability of Article................................................................ 63
SECTION 1302.  Satisfaction of Sinking Fund Payments with Notes........................................ 63
SECTION 1303.  Redemption of Notes for Sinking Fund.................................................... 63

                                         ARTICLE FOURTEEN

                                DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1401.  Company's Option to Effect Defeasance or
                       Covenant Defeasance............................................................. 64
SECTION 1402.  Defeasance and Discharge................................................................ 64
SECTION 1403.  Covenant Defeasance..................................................................... 65
SECTION 1404.  Conditions to Defeasance or Covenant Defeasance......................................... 65
SECTION 1405.  Deposited Money and U.S. Government Obligations
                    to Be Held in Trust; Miscellaneous Provisions...................................... 67
SECTION 1406.  Reinstatement........................................................................... 67

TESTIMONIUM
SIGNATURES AND SEALS
ACKNOWLEDGEMENTS

      INDENTURE,  dated as of November 15, 1996,  between Arizona Public Service
Company,  a corporation  duly organized and existing under the laws of the State
of Arizona  (herein called the  "Company"),  having its principal  office at 400
North Fifth Street, Phoenix, Arizona 85004, and The Bank of New York, a New York
banking corporation, as Trustee (herein called the "Trustee").


                             RECITALS OF THE COMPANY

      The  Company  has duly  authorized  the  execution  and  delivery  of this
Indenture  to provide  for the  issuance  from time to time of its Senior  Notes
(herein  called  the  "Notes"),  to be issued  in one or more  series as in this
Indenture provided.

   Subject to the provisions of Section 403 hereof, the Company may issue one or
more series of Senior Note First  Mortgage  Bonds (as  hereinafter  defined) and
deliver  such Senior Note First  Mortgage  Bonds to the Trustee to hold in trust
for the  benefit  of the  respective  Holders  from time to time of the  related
series  of  Notes,  or  require  the  Trustee  to  deliver  to the  Company  for
cancellation any and all Senior Note First Mortgage Bonds held by the Trustee.

      All things  necessary  to make this  Indenture  a valid  agreement  of the
Company, in accordance with its terms, have been done.

      NOW, THEREFORE, THIS INDENTURE WITNESSETH:

      For and in  consideration of the premises and the purchase of the Notes by
the Holders thereof,  it is mutually  agreed,  for the benefit of all Holders of
the Notes or of series thereof, as follows:


                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION


SECTION 101.  Definitions.

      For all purposes of this Indenture, except as otherwise expressly provided
or unless the context otherwise requires:

         (1) the terms  defined in this Article  have the  meanings  assigned to
them in this Article and include the plural as well as the singular;

         (2) all  other  terms  used  herein  which  are  defined  in the  Trust
Indenture  Act,  either  directly or by  reference  therein,  have the  meanings
assigned to them therein;

         (3) all accounting terms not otherwise defined herein have the meanings
assigned to them in accordance with generally  accepted  accounting  principles,
and, except as otherwise herein expressly provided, the term "generally accepted
accounting  principles"  with respect to any  computation  required or permitted
hereunder shall mean such accounting principles as are generally accepted in the
United States of America;

         (4)  unless  the  context  otherwise  requires,  any  reference  to  an
"Article" or a "Section" refers to an Article or a Section,  as the case may be,
of this Indenture; and

         (5) the words  "herein",  "hereof" and  "hereunder"  and other words of
similar  import  refer to this  Indenture  as a whole and not to any  particular
Article, Section or other subdivision.

      "Act", when used with respect to any Holder, has the meaning specified in
Section 104.

      "Affiliate"  of any  specified  Person means any other Person  directly or
indirectly  controlling  or  controlled  by or under  direct or indirect  common
control  with  such  specified  Person.  For the  purposes  of this  definition,
"control"  when used with  respect to any  specified  Person  means the power to
direct the  management  and  policies of such  Person,  directly or  indirectly,
whether  through the ownership of voting  securities,  by contract or otherwise;
and the terms  "controlling" and "controlled"  have meanings  correlative to the
foregoing.

      "Authenticating Agent" means any Person authorized by the Trustee pursuant
to Section 714 to act on behalf of the Trustee to  authenticate  Notes of one or
more series.

      "Board of Directors" means either the board of directors of the Company or
any duly authorized committee of that board.

      "Board Resolution" means a copy of a resolution certified by the Secretary
or an Assistant  Secretary  or  Associate  Secretary of the Company to have been
duly adopted by the Board of Directors and to be in full force and effect on the
date of such certification, and delivered to the Trustee.

      "Business Day", when used with respect to any Place of Payment, means each
Monday,  Tuesday,  Wednesday,  Thursday  and Friday  which is not a day on which
banking institutions in that Place of Payment are authorized or obligated by law
or executive order to close.

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

      "Company"  means the Person named as the "Company" in the first  paragraph
of this instrument  until a successor  Person shall have become such pursuant to
the applicable provisions of this Indenture, and thereafter "Company" shall mean
such successor Person.

      "Company  Request" or  "Company  Order"  means a written  request or order
signed  in the  name of the  Company  by its  Chairman  of the  Board,  its Vice
Chairman of the Board, its President or a Vice President,  and by its Treasurer,
an Assistant  Treasurer,  its Secretary,  an Assistant Secretary or an Associate
Secretary, and delivered to the Trustee.

      "Corporate  Trust  Office"  means the office of the Trustee in the City of
New York, New York at which at any particular  time its corporate trust business
shall be principally administered, which office at the date hereof is located at
101 Barclay Street, New York, New York 10286.

      "Corporation"  means  a  corporation,  association,  company,  joint-stock
company or business trust.
                                        2

      "Covenant Defeasance" has the meaning specified in Section 1403.

      "Defaulted Interest" has the meaning specified in Section 307.

      "Defeasance" has the meaning specified in Section 1402.

      "Depositary"  means, with respect to Notes of any series issuable in whole
or in part in the form of one or more Global Notes, a clearing agency registered
under the Exchange Act that is designated to act as Depositary for such Notes as
contemplated by Section 301.

      "Event of Default" has the meaning specified in Section 601.

      "Exchange Act" means the  Securities  Exchange Act of 1934 and any statute
successor thereto, in each case as amended from time to time.

      "Expiration Date" has the meaning specified in Section 104.

      "Expert"  means any officer of the Company  familiar with the terms of the
First Mortgage and this Indenture, any law firm, any investment banking firm, or
any other Person,  in each case that is appointed by Company Order, is an expert
in the applicable matter, and is satisfactory in the reasonable  judgment of the
Trustee.

      "First Mortgage" means the Mortgage and Deed of Trust, dated as of July 1,
1946, from the Company to The Bank of New York, as successor  trustee to Bank of
America National Trust and Savings Association, as supplemented and amended from
time to time.

      "First  Mortgage  Bonds"  means all  first  mortgage  bonds  issued by the
Company and outstanding  under the First Mortgage,  other than Senior Note First
Mortgage Bonds.

      "Global Note" means a Note that  evidences all or part of the Notes of any
series and bears the legend set forth in Section  204 (or such  legend as may be
specified as contemplated by Section 301 for such Notes).

      "Holder"  means a Person in whose  name a Note is  registered  in the Note
Register.

      "Indenture"  means this  instrument as  originally  executed and as it may
from  time  to  time  be  supplemented  or  amended  by one or  more  indentures
supplemental  hereto entered into pursuant to the applicable  provisions hereof,
including,  for all  purposes  of this  instrument  and  any  such  supplemental
indenture,  the  provisions  of the Trust  Indenture Act that are deemed to be a
part  of and  govern  this  instrument  and  any  such  supplemental  indenture,
respectively.  The term  "Indenture"  shall also include the terms of particular
series of Notes established as contemplated by Section 301.

      "independent", when applied to any accountant, appraiser, or other Expert,
shall mean such a Person who is in fact independent, selected by the Company and
approved by the Trustee in the exercise of reasonable care.

      "Interest",  when used with  respect to an Original  Issue  Discount  Note
which by its terms bears interest only after  Maturity,  means interest  payable
after Maturity.

      "Interest  Payment  Date",  when used with respect to any Note,  means the
Stated Maturity of an instalment of interest on such Note.
                                        3

      "Investment  Company Act" means the Investment Company Act of 1940 and any
statute successor thereto, in each case as amended from time to time.

      "Maturity",  when used with  respect to any Note,  means the date on which
the principal of such Note or an instalment of principal becomes due and payable
as therein or herein provided,  whether at the Stated Maturity or by declaration
of acceleration, call for redemption or otherwise.

      "Mortgage  Trustee"  means the Person serving as trustee at the time under
the First Mortgage.

      "Notes" has the meaning  stated in the first recital of this Indenture and
more  particularly  means any  Notes  authenticated  and  delivered  under  this
Indenture.

      "Note  Register"  and  "Note  Registrar"  have  the  respective   meanings
specified in Section 305.

      "Notice  of  Default"  means a  written  notice of the kind  specified  in
Section 601(4).

      "Officers'  Certificate" means a certificate signed by the Chairman of the
Board, a Vice Chairman of the Board,  the President or a Vice President,  and by
the  Treasurer,  an Assistant  Treasurer,  the  Controller,  the Secretary or an
Assistant  Secretary,  of the Company,  and delivered to the Trustee. One of the
officers signing an Officers'  Certificate  given pursuant to Section 1104 shall
be the principal executive, financial or accounting officer of the Company.

      "Opinion  of  Counsel"  means a written  opinion  of  counsel,  who may be
counsel  for the  Company,  or other  counsel  who  shall be  acceptable  to the
Trustee.

      "Original Issue Discount Note" means any Note which provides for an amount
less than the principal  amount thereof to be due and payable upon a declaration
of acceleration of the Maturity thereof pursuant to Section 602.

      "Outstanding",  when used with respect to Notes,  means, as of the date of
determination,  all Notes  theretofore  authenticated  and delivered  under this
Indenture, except:

         (1) Notes  theretofore  cancelled  by the Trustee or  delivered  to the
   Trustee for cancellation;

         (2) Notes for whose payment or redemption money in the necessary amount
   has been  theretofore  deposited  with the Trustee or any Paying Agent (other
   than the  Company)  in  trust or set  aside  and  segregated  in trust by the
   Company (if the Company shall act as its own Paying Agent) for the Holders of
   such Notes;  provided that, if such Notes are to be redeemed,  notice of such
   redemption  has been duly  given  pursuant  to this  Indenture  or  provision
   therefor satisfactory to the Trustee has been made;

         (3) Notes as to which Defeasance has been effected  pursuant to Section
   1402; and
                                        4

         (4) Notes  which have been paid  pursuant to Section 306 or in exchange
   for or in lieu of which other  Notes have been  authenticated  and  delivered
   pursuant  to this  Indenture,  other  than any such Notes in respect of which
   there shall have been presented to the Trustee proof  satisfactory to it that
   such Notes are held by a bona fide  purchaser  in whose  hands such Notes are
   valid obligations of the Company;

provided,  however,  that in  determining  whether the Holders of the  requisite
principal amount of the Outstanding Notes have given, made or taken any request,
demand,  authorization,  direction,  notice,  consent,  waiver  or other  action
hereunder as of any date, (A) the principal amount of an Original Issue Discount
Note  which  shall  be  deemed  to be  Outstanding  shall be the  amount  of the
principal  thereof  which  would  be  due  and  payable  as of  such  date  upon
acceleration  of the Maturity  thereof to such date pursuant to Section 602, (B)
if, as of such date, the principal  amount  payable at the Stated  Maturity of a
Note is not  determinable,  the  principal  amount of such Note  which  shall be
deemed to be  Outstanding  shall be the amount as  specified  or  determined  as
contemplated by Section 301, (C) the principal  amount of a Note  denominated in
one or more  foreign  currencies  or currency  units which shall be deemed to be
Outstanding shall be the U.S. dollar  equivalent,  determined as of such date in
the manner provided as  contemplated by Section 301, of the principal  amount of
such Note (or, in the case of a Note  described  in Clause (A) or (B) above,  of
the amount  determined as provided in such  Clause),  and (D) Notes owned by the
Company or any other  obligor upon the Notes or any  Affiliate of the Company or
of such other obligor  shall be  disregarded  and deemed not to be  Outstanding,
except that,  in  determining  whether the Trustee shall be protected in relying
upon any such request, demand, authorization, direction, notice, consent, waiver
or other  action,  only Notes  which the Trustee  actually  knows to be so owned
shall be so  disregarded.  Notes so owned which have been  pledged in good faith
may be regarded as Outstanding if the pledgee establishes to the satisfaction of
the Trustee the  pledgee's  right so to act with  respect to such Notes and that
the  pledgee  is not the  Company  or any  other  obligor  upon the Notes or any
Affiliate of the Company or of such other obligor.

      "Paying  Agent"  means any  Person  authorized  by the  Company to pay the
principal of or any premium or interest on any Notes on behalf of the Company.

      "Person" means any individual,  corporation,  partnership,  joint venture,
trust,  unincorporated  organization  or  government  or any agency or political
subdivision thereof.

      "Place of  Payment",  when used with  respect to the Notes of any  series,
means the place or places where the principal of and any premium and interest on
the Notes of that series are payable as  specified  as  contemplated  by Section
301.

      "Predecessor  Note" of any  particular  Note  means  every  previous  Note
evidencing  all or a  portion  of the  same  debt  as  that  evidenced  by  such
particular   Note;  and,  for  the  purposes  of  this   definition,   any  Note
authenticated  and  delivered  under Section 306 in exchange for or in lieu of a
mutilated,  destroyed,  lost or stolen Note shall be deemed to evidence the same
debt as the mutilated, destroyed, lost or stolen Note.

      "Redemption  Date",  when used with  respect  to any Note to be  redeemed,
means the date fixed for such redemption by or pursuant to this Indenture.
                                        5

      "Redemption  Price",  when used with  respect to any Note to be  redeemed,
means the price at which it is to be redeemed pursuant to this Indenture.

      "Regular  Record  Date" for the interest  payable on any Interest  Payment
Date on the Notes of any series  means the date  specified  for that  purpose as
contemplated by Section 301.

      "Release  Date" means the date as of which all First  Mortgage  Bonds have
been retired through payment,  redemption,  or otherwise at, before or after the
maturity thereof.

      "Responsible  Officer",  when used with respect to the Trustee,  means the
chairman or any  vice-chairman  of the board of  directors,  the chairman or any
vice-chairman of the executive committee of the board of directors, the chairman
of the trust committee,  the president,  any vice president,  the secretary, any
assistant secretary,  the treasurer,  any assistant treasurer,  the cashier, any
assistant  cashier,  any senior trust  officer,  any trust  officer or assistant
trust officer,  the controller or any assistant  controller or any other officer
of the Trustee  customarily  performing  functions similar to those performed by
any of  the  above  designated  officers  and  also  means,  with  respect  to a
particular  corporate  trust  matter,  any other  officer to whom such matter is
referred  because  of his  knowledge  of and  familiarity  with  the  particular
subject.

      "Securities  Act"  means  the  Securities  Act of  1933  and  any  statute
successor thereto, in each case as amended from time to time.

      "Senior  Note First  Mortgage  Bonds"  shall mean any bonds  issued by the
Company  under the First  Mortgage  and  delivered  to the  Trustee  pursuant to
Section 401 hereof.

      "Special  Record Date" for the payment of any Defaulted  Interest  means a
date fixed by the Trustee pursuant to Section 307.

      "Stated Maturity", when used with respect to any Note or any instalment of
principal thereof or interest thereon,  means the date specified in such Note as
the  fixed  date on which  the  principal  of such  Note or such  instalment  of
principal or interest is due and payable.

      "Subsidiary"  means a corporation more than 50% of the outstanding  voting
stock of which is owned,  directly  or  indirectly,  by the Company or by one or
more other  Subsidiaries,  or by the Company and one or more other Subsidiaries.
For the purposes of this definition, "voting stock" means stock which ordinarily
has voting power for the election of directors,  whether at all times or only so
long as no  senior  class  of stock  has such  voting  power  by  reason  of any
contingency.

      "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this instrument was executed;  provided,  however,  that in
the event the Trust  Indenture  Act of 1939 is amended  after such date,  "Trust
Indenture Act" means, to the extent  required by any such  amendment,  the Trust
Indenture Act of 1939 as so amended.

      "Trustee"  means the Person named as the "Trustee" in the first  paragraph
of this instrument until a successor  Trustee shall have become such pursuant to
the applicable provisions of this Indenture, and thereafter "Trustee" shall mean
or include each Person who
                                        6

is then a  Trustee  hereunder,  and if at any time  there is more  than one such
Person, "Trustee" as used with respect to the Notes of any series shall mean the
Trustee with respect to Notes of that series.

      "U.S. Government Obligation" has the meaning specified in Section 1404.

      "Vice  President",  when used with  respect to the Company or the Trustee,
means any vice  president,  whether or not  designated  by a number or a word or
words added before or after the title "vice president".


SECTION 102.  Compliance Certificates and Opinions.

      Upon any  application or request by the Company to the Trustee to take any
action under any provision of this  Indenture,  the Company shall furnish to the
Trustee  such  certificates  and  opinions  as may be  required  under the Trust
Indenture Act. Each such certificate or opinion shall be given in the form of an
Officers'  Certificate,  if to be  given by an  officer  of the  Company,  or an
Opinion  of  Counsel,  if to be given by  counsel,  and  shall  comply  with the
requirements of the Trust Indenture Act and any other  requirements set forth in
this Indenture.

      Every  certificate or opinion with respect to compliance  with a condition
or covenant provided for in this Indenture shall include,

         (1) a  statement  that each  individual  signing  such  certificate  or
opinion has read such covenant or condition and the definitions  herein relating
thereto;

         (2) a brief  statement as to the nature and scope of the examination or
investigation   upon  which  the  statements  or  opinions   contained  in  such
certificate or opinion are based;

         (3) a statement  that, in the opinion of each such  individual,  he has
made such  examination or investigation as is necessary to enable him to express
an informed  opinion as to whether or not such  covenant or  condition  has been
complied with; and

         (4) a statement as to whether,  in the opinion of each such individual,
such condition or covenant has been complied with.


SECTION 103.  Form of Documents Delivered to Trustee.

      In any case where  several  matters are  required to be  certified  by, or
covered by an opinion of, any specified  Person,  it is not  necessary  that all
such  matters  be  certified  by, or covered by the  opinion  of,  only one such
Person,  or that they be so certified or covered by only one  document,  but one
such Person may certify or give an opinion  with respect to some matters and one
or more other such Persons as to other matters,  and any such Person may certify
or give an opinion as to such matters in one or several documents.

      Any  certificate  or opinion of an  officer of the  Company  may be based,
insofar as it relates to legal  matters,  upon a  certificate  or opinion of, or
representations by, counsel,
                                        7

unless such officer  knows,  or in the exercise of reasonable  care should know,
that the certificate or opinion or  representations  with respect to the matters
upon  which  his  certificate  or  opinion  is  based  are  erroneous.  Any such
certificate or opinion of counsel may be based, insofar as it relates to factual
matters,  upon a certificate or opinion of, or representations by, an officer or
officers  of the  Company  stating  that the  information  with  respect to such
factual matters is in the possession of the Company,  unless such counsel knows,
or in the exercise of  reasonable  care should  know,  that the  certificate  or
opinion or representations with respect to such matters are erroneous.

      Where  any  Person  is  required  to  make,  give or  execute  two or more
applications,  requests, consents,  certificates,  statements, opinions or other
instruments  under this Indenture,  they may, but need not, be consolidated  and
form one instrument.


SECTION 104.  Acts of Holders; Record Dates.

      Any request, demand, authorization,  direction, notice, consent, waiver or
other action provided or permitted by this Indenture to be given,  made or taken
by Holders  may be  embodied  in and  evidenced  by one or more  instruments  of
substantially  similar  tenor  signed by such Holders in person or by agent duly
appointed in writing;  and, except as herein otherwise expressly provided,  such
action shall become  effective when such instrument or instruments are delivered
to the Trustee and, where it is hereby expressly required,  to the Company. Such
instrument  or  instruments  (and the  action  embodied  therein  and  evidenced
thereby) are herein  sometimes  referred to as the "Act" of the Holders  signing
such instrument or instruments.  Proof of execution of any such instrument or of
a writing  appointing any such agent shall be sufficient for any purpose of this
Indenture  and (subject to Section 701)  conclusive  in favor of the Trustee and
the Company, if made in the manner provided in this Section.

      The fact and date of the execution by any Person of any such instrument or
writing may be proved by the  affidavit  of a witness of such  execution or by a
certificate  of a notary  public  or  other  officer  authorized  by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him the execution thereof. Where such execution is by
a  signer  acting  in a  capacity  other  than  his  individual  capacity,  such
certificate  or  affidavit  shall  also  constitute   sufficient  proof  of  his
authority. The fact and date of the execution of any such instrument or writing,
or the  authority of the Person  executing  the same,  may also be proved in any
other manner which the Trustee deems sufficient.

      The ownership of Notes shall be proved by the Note Register.

      Any request, demand, authorization,  direction, notice, consent, waiver or
other Act of the Holder of any Note shall bind every  future  Holder of the same
Note and the Holder of every  Note  issued  upon the  registration  of  transfer
thereof or in exchange  therefor or in lieu thereof in respect of anything done,
omitted  or  suffered  to be done by the  Trustee  or the  Company  in  reliance
thereon, whether or not notation of such action is made upon such Note.
                                        8

      The  Company  may  set  any  day as a  record  date  for  the  purpose  of
determining  the Holders of  Outstanding  Notes of any series  entitled to give,
make or take any request,  demand,  authorization,  direction,  notice, consent,
waiver or other action provided or permitted by this Indenture to be given, made
or taken by Holders of Notes of such series,  provided  that the Company may not
set a record date for, and the provisions of this paragraph shall not apply with
respect  to,  the  giving or  making  of any  notice,  declaration,  request  or
direction referred to in the next paragraph.  If any record date is set pursuant
to this  paragraph,  the Holders of Outstanding  Notes of the relevant series on
such record date, and no other Holders,  shall be entitled to take or revoke the
relevant  action,  whether or not such Holders  remain Holders after such record
date;  provided that no such action shall be effective hereunder unless taken on
or prior to the applicable Expiration Date by Holders of the requisite principal
amount of Outstanding Notes of such series on such record date.  Nothing in this
paragraph  shall be  construed  to prevent the Company from setting a new record
date for any action for which a record date has previously  been set pursuant to
this paragraph (whereupon the record date previously set shall automatically and
with no action by any Person be cancelled and of no effect), and nothing in this
paragraph  shall be construed to render  ineffective any action taken by Holders
of the requisite principal amount of Outstanding Notes of the relevant series on
the date such action is taken. Promptly after any record date is set pursuant to
this  paragraph,  the Company,  at its own  expense,  shall cause notice of such
record date, the proposed  action by Holders and the applicable  Expiration Date
to be  given  to the  Trustee  in  writing  and to each  Holder  of Notes of the
relevant series in the manner set forth in Section 106.

      The  Trustee  may  set  any  day as a  record  date  for  the  purpose  of
determining  the Holders of Outstanding  Notes of any series entitled to join in
the  giving or making of (i) any  Notice of  Default,  (ii) any  declaration  of
acceleration  referred  to in  Section  602,  (iii)  any  request  to  institute
proceedings  referred to in Section 607(2) or (iv) any direction  referred to in
Section 612, in each case with  respect to Notes of such  series.  If any record
date is set pursuant to this paragraph, the Holders of Outstanding Notes of such
series on such record date, and no other  Holders,  shall be entitled to join in
such notice, declaration, request or direction or to revoke the same, whether or
not such Holders  remain  Holders after such record date;  provided that no such
action shall be effective  hereunder  unless taken on or prior to the applicable
Expiration  Date by Holders of the  requisite  principal  amount of  Outstanding
Notes of such series on such record  date.  Nothing in this  paragraph  shall be
construed  to prevent the Trustee  from setting a new record date for any action
for which a record  date has  previously  been set  pursuant  to this  paragraph
(whereupon the record date previously set shall automatically and with no action
by any Person be  cancelled  and of no effect),  and  nothing in this  paragraph
shall be  construed  to render  ineffective  any action  taken by Holders of the
requisite  principal  amount of Outstanding  Notes of the relevant series on the
date such action is taken.  Promptly  after any record  date is set  pursuant to
this paragraph,  the Trustee,  at the Company's  expense,  shall cause notice of
such record date, the proposed  action by Holders and the applicable  Expiration
Date to be given to the  Company in writing  and to each  Holder of Notes of the
relevant series in the manner set forth in Section 106.

      With  respect to any record date set pursuant to this  Section,  the party
hereto which sets such record  dates may  designate  any day as the  "Expiration
Date" and from time to time may change  the  Expiration  Date to any  earlier or
later day;  provided that no such change shall be effective unless notice of the
proposed new Expiration Date is given to the other
                                        9

party hereto in writing,  and to each Holder of Notes of the relevant  series in
the manner  set forth in Section  106,  on or prior to the  existing  Expiration
Date. If an Expiration  Date is not  designated  with respect to any record date
set pursuant to this Section,  the party hereto which set such record date shall
be deemed to have  initially  designated the 180th day after such record date as
the  Expiration  Date with respect  thereto,  subject to its right to change the
Expiration Date as provided in this paragraph. Notwithstanding the foregoing, no
Expiration  Date shall be later than the 180th day after the  applicable  record
date.

      Without  limiting the foregoing,  a Holder entitled  hereunder to take any
action hereunder with regard to any particular Note may do so with regard to all
or any  part  of the  principal  amount  of such  Note  or by one or  more  duly
appointed  agents  each of which may do so  pursuant  to such  appointment  with
regard to all or any part of such principal amount.


SECTION 105.  Notices, Etc., to Trustee and Company.

      Any request, demand, authorization,  direction, notice, consent, waiver or
Act of Holders or other  document  provided or permitted by this Indenture to be
made upon, given or furnished to, or filed with,

         (1) the Trustee by any Holder or by the Company shall be sufficient for
every purpose hereunder if made, given, furnished or filed in writing to or with
the  Trustee  at  its  Corporate  Trust  Office,  Attention:  Corporate  Trustee
Administration, or

         (2) the Company by the Trustee or by any Holder shall be sufficient for
every purpose  hereunder  (unless  otherwise  herein  expressly  provided) if in
writing and mailed,  first-class postage prepaid, to the Company addressed to it
at the address of its principal  office specified in the first paragraph of this
instrument  or at any other  address  previously  furnished  in  writing  to the
Trustee by the Company.

SECTION 106.  Notice to Holders; Waiver.

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

      In case by reason of the  suspension  of regular mail service or by reason
of any other cause it shall be  impracticable  to give such notice by mail, then
such  notification  as shall be made  with the  approval  of the  Trustee  shall
constitute a sufficient notification for every purpose hereunder.
                                       10

SECTION 107.  Conflict with Trust Indenture Act.

      If any provision hereof limits, qualifies or conflicts with a provision of
the Trust  Indenture  Act which is  required  under such Act to be a part of and
govern this Indenture,  the latter provision shall control.  If any provision of
this  Indenture  modifies or excludes any  provision of the Trust  Indenture Act
which may be so modified or excluded,  the latter  provision  shall be deemed to
apply to this Indenture as so modified or to be excluded, as the case may be.


SECTION 108.  Effect of Headings and Table of Contents.

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


SECTION 109.  Successors and Assigns.

      All covenants and  agreements in this  Indenture by the Company shall bind
its successors and assigns, whether so expressed or not.


SECTION 110.  Separability Clause.

      In case any provision in this  Indenture or in the Notes shall be invalid,
illegal or  unenforceable,  the  validity,  legality and  enforceability  of the
remaining provisions shall not in any way be affected or impaired thereby.


SECTION 111.  Benefits of Indenture.

      Nothing in this Indenture or in the Notes, express or implied,  shall give
to any Person,  other than the parties hereto and their successors hereunder and
the Holders,  any benefit or any legal or equitable right, remedy or claim under
this Indenture.


SECTION 112.  Governing Law.

      This  Indenture  and the  Notes  shall be  governed  by and  construed  in
accordance with the law of the State of New York, without regard to conflicts of
laws principles thereof.
                                       11

SECTION 113.  Legal Holidays.

      In any case where any Interest  Payment  Date,  Redemption  Date or Stated
Maturity of any Note shall not be a Business  Day at any Place of Payment,  then
(notwithstanding  any other  provision of this  Indenture or of the Notes (other
than a provision of any Note which specifically states that such provision shall
apply in lieu of this  Section))  payment of interest or principal (and premium,
if any) need not be made at such Place of Payment on such date,  but may be made
on the next succeeding Business Day at such Place of Payment with the same force
and effect as if made on the Interest Payment Date or Redemption Date, or at the
Stated Maturity.


                                   ARTICLE TWO

                                   NOTE FORMS


SECTION 201.  Forms Generally.

      The Notes of each series shall be in  substantially  the form set forth in
this Article,  or in such other form as shall be established by or pursuant to a
Board Resolution or in one or more indentures  supplemental hereto, in each case
with such appropriate insertions, omissions,  substitutions and other variations
as are  required or  permitted  by this  Indenture,  and may have such  letters,
numbers or other marks of identification and such legends or endorsements placed
thereon as may be required to comply with the rules of any  securities  exchange
or Depositary therefor or as may,  consistently  herewith,  be determined by the
officers executing such Notes, as evidenced by their execution  thereof.  If the
form of Notes of any series is  established  by action taken pursuant to a Board
Resolution, a copy of an appropriate record of such action shall be certified by
the  Secretary  or an Assistant  Secretary  of the Company and  delivered to the
Trustee at or prior to the delivery of the Company Order contemplated by Section
303 for the authentication and delivery of such Notes.

      The definitive  Notes shall be printed,  lithographed or engraved on steel
engraved  borders or may be produced in any other  manner,  all as determined by
the officers  executing  such Notes,  as  evidenced  by their  execution of such
Notes.


SECTION 202.  Form of Face of Note.

      [Insert  any  legend  required  by  the  Internal  Revenue  Code  and  the
regulations thereunder.]

                         ARIZONA PUBLIC SERVICE COMPANY

               ..................................................

No. .........                                                         $ ........
                                                                 CUSIP No.______
                                       12

      Arizona Public Service Company,  a corporation duly organized and existing
under the laws of Arizona (herein called the "Company",  which term includes any
successor  Person  under  the  Indenture  hereinafter  referred  to),  for value
received,          hereby          promises          to          pay          to
 ...............................................,   or  registered  assigns,  the
principal    sum   of    ......................................    Dollars    on
 ........................................................ [if the Note is to bear
interest  prior  to  Maturity,  insert  _ ,  and to pay  interest  thereon  from
 .............  or from the most recent  Interest  Payment Date to which interest
has  been  paid  or  duly  provided  for,  semi-annually  on  ............   and
 ............ in each year, commencing ........., at the rate of ....% per annum,
until the principal hereof is paid or made available for payment [if applicable,
insert _ , provided that any principal and premium,  and any such  instalment of
interest, which is overdue shall bear interest at the rate of ...% per annum (to
the extent that the payment of such interest shall be legally enforceable), from
the  dates  such  amounts  are due  until  they are paid or made  available  for
payment, and such interest shall be payable on demand]. The interest so payable,
and punctually paid or duly provided for, on any Interest  Payment Date will, as
provided  in such  Indenture,  be paid to the Person in whose name this Note (or
one or more  Predecessor  Notes) is  registered  at the close of business on the
Regular  Record Date for such  interest,  which shall be the .......  or .......
(whether  or not a  Business  Day),  as the case  may be,  next  preceding  such
Interest Payment Date. Any such interest not so punctually paid or duly provided
for will forthwith cease to be payable to the Holder on such Regular Record Date
and may  either be paid to the  Person  in whose  name this Note (or one or more
Predecessor  Notes) is registered  at the close of business on a Special  Record
Date for the  payment of such  Defaulted  Interest  to be fixed by the  Trustee,
notice  whereof  shall be given to Holders of Notes of this series not less than
10 days prior to such Special  Record Date,  or be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities  exchange
on which the Notes of this series may be listed,  and upon such notice as may be
required by such exchange, all as more fully provided in said Indenture].

[If the Note is not to bear interest  prior to Maturity,  insert _ The principal
of this Note shall not bear interest  except in the case of a default in payment
of principal upon  acceleration,  upon  redemption or at Stated  Maturity and in
such case the overdue  principal and any overdue  premium shall bear interest at
the rate of ....% per annum (to the extent  that the  payment  of such  interest
shall be legally  enforceable),  from the dates such  amounts are due until they
are paid or made  available  for payment.  Interest on any overdue  principal or
premium shall be payable on demand.  Any such  interest on overdue  principal or
premium  which is not paid on demand shall bear  interest at the rate of ......%
per annum (to the extent that the payment of such interest on interest  shall be
legally enforceable),  from the date of such demand until the amount so demanded
is paid or made available for payment.
Interest on any overdue interest shall be payable on demand.]

      Payment of the  principal  of (and  premium,  if any) and [if  applicable,
insert _ any such] interest on this Note will be made at the office or agency of
the  Company  maintained  for that  purpose  in  ............,  in such  coin or
currency  of the  United  States of  America  as at the time of payment is legal
tender for  payment  of public  and  private  debts [if  applicable,  insert _ ;
provided,  however, that at the option of the Company payment of interest may be
made by check  mailed to the  address  of the  Person  entitled  thereto as such
address shall appear in the Note Register].
                                       13

      Reference is hereby made to the further  provisions of this Note set forth
on the reverse hereof,  which further provisions shall for all purposes have the
same effect as if set forth at this place.

      Unless the certificate of  authentication  hereon has been executed by the
Trustee referred to on the reverse hereof by manual  signature,  this Note shall
not be entitled to any benefit under the Indenture or be valid or obligatory for
any purpose.

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



                                                  ARIZONA PUBLIC SERVICE COMPANY

                                                    By..........................

Attest:

 ......................


SECTION 203.  Form of Reverse of Note.

      This Note is one of a duly  authorized  issue of securities of the Company
(herein called the "Notes"), issued and to be issued in one or more series under
an  Indenture,  dated as of November  15, 1996 (herein  called the  "Indenture",
which term shall have the meaning  assigned to it in such  instrument),  between
the Company and The Bank of New York, as Trustee  (herein  called the "Trustee",
which term includes any successor trustee under the Indenture), and reference is
hereby  made  to  the  Indenture  for a  statement  of  the  respective  rights,
limitations  of rights,  duties and  immunities  thereunder of the Company,  the
Trustee  and the Holders of the Notes and of the terms upon which the Notes are,
and are to be,  authenticated  and  delivered.  This  Note is one of the  series
designated  on the face hereof [if  applicable,  insert _ , limited in aggregate
principal amount to $...........].

   [If the Note is  issued  before  the  Release  Date,  insert  __ Prior to the
Release  Date (as  hereinafter  defined),  this  Note will be  secured  by First
Mortgage  Bonds,  Senior Note Series  .......  (the "Senior Note Series  .......
Bonds")  delivered  by the Company to the Trustee for the benefit of the Holders
of the series of Notes of which this Note is a part,  issued  under the Mortgage
and Deed of Trust, dated as of July 1, 1946, from the Company to The Bank of New
York, as successor trustee (the "Mortgage Trustee"), as supplemented and amended
(the  "First  Mortgage").  Reference  is  made  to  the  First  Mortgage  for  a
description  of property  mortgaged  and  pledged,  the nature and extent of the
security,  the rights of the holders of the first mortgage bonds under the First
Mortgage  and of the  Mortgage  Trustee  in  respect  thereof,  the  duties  and
immunities of the Mortgage  Trustee and the terms and conditions  upon which the
Senior Note Series ......  Bonds are secured and the  circumstances  under which
additional first mortgage bonds may be issued.
                                       14

   FROM AND AFTER SUCH TIME AS ALL FIRST  MORTGAGE BONDS (OTHER THAN SENIOR NOTE
FIRST  MORTGAGE  BONDS,  AS SUCH TERM IS  DEFINED IN THE  INDENTURE,)  HAVE BEEN
RETIRED  THROUGH  PAYMENT,  REDEMPTION  OR  OTHERWISE  AT,  BEFORE  OR AFTER THE
MATURITY  THEREOF (THE "RELEASE  DATE"),  THE SENIOR NOTE FIRST  MORTGAGE  BONDS
SHALL CEASE TO SECURE THE NOTES IN ANY MANNER.]

      [If  applicable,  insert  _ The  Notes  of  this  series  are  subject  to
redemption upon not less than 30 days' notice by mail, [if applicable,  insert _
(1) on ...........  in any year commencing with the year ......  and ending with
the year  ......  through  operation  of the  sinking  fund for this series at a
Redemption Price equal to 100% of the principal amount, and (2)] at any time [if
applicable,  insert _ on or after  ..........,  19..], as a whole or in part, at
the election of the Company,  at the following  Redemption  Prices (expressed as
percen- tages of the principal amount): If redeemed [if applicable,  insert _ on
or before  ...............,  ...%, and if redeemed]  during the 12-month  period
beginning ............. of the years indicated,



Year          Redemption                Year                       Redemption
- ----            Price                   ----                         Price
              ----------                                           ----------







and  thereafter at a Redemption  Price equal to .....% of the principal  amount,
together in the case of any such  redemption [if  applicable,  insert _ (whether
through  operation of the sinking fund or otherwise)]  with accrued  interest to
the Redemption  Date, but interest  installments  whose Stated Maturity is on or
prior to such  Redemption  Date will be payable to the Holders of such Notes, or
one or more  Predecessor  Notes,  of  record  at the  close of  business  on the
relevant  Record Dates  referred to on the face  hereof,  all as provided in the
Indenture.]

      [If  applicable,  insert  _ The  Notes  of  this  series  are  subject  to
redemption  upon not less than 30 days' notice by mail, (1) on  ............  in
any year  commencing  with the year ....  and ending with the year ....  through
operation  of the  sinking  fund for this  series at the  Redemption  Prices for
redemption  through  operation of the sinking fund  (expressed as percentages of
the  principal  amount)  set forth in the table  below,  and (2) at any time [if
applicable,  insert _ on or after  ............],  as a whole or in part, at the
election of the Company, at the Redemption Prices for redemption  otherwise than
through operation of the sinking fund (expressed as percentages of the principal
amount) set forth in the table below:  If redeemed  during the  12-month  period
beginning ............ of the years indicated,
                                       15


Year            Redemption Price                       Redemption Price For
- ----             For Redemption                        Redemption Otherwise
               Through Operation                      Than Through Operation
                     of the                             of the Sinking Fund
                  Sinking Fund                        ----------------------
               -----------------






and  thereafter at a Redemption  Price equal to .....% of the principal  amount,
together in the case of any such redemption  (whether  through  operation of the
sinking fund or otherwise)  with accrued  interest to the  Redemption  Date, but
interest  installments  whose Stated  Maturity is on or prior to such Redemption
Date will be payable to the  Holders of such Notes,  or one or more  Predecessor
Notes,  of record at the close of business on the relevant Record Dates referred
to on the face hereof, all as provided in the Indenture.]

      [If applicable,  insert _ Notwithstanding  the foregoing,  the Company may
not, prior to .............,  redeem any Notes of this series as contemplated by
[if applicable, insert _ Clause (2) of] the preceding paragraph as a part of, or
in  anticipation  of, any refunding  operation by the  application,  directly or
indirectly,   of  moneys  borrowed  having  an  interest  cost  to  the  Company
(calculated in accordance with generally  accepted  financial  practice) of less
than .....% per annum.]

      [If applicable, insert _ The sinking fund for this series provides for the
redemption on  ............  in each year  beginning  with the year .......  and
ending  with  the  year  ......  of  [if  applicable,  insert  _ not  less  than
$..........  ("mandatory sinking fund") and not more than] $.........  aggregate
principal  amount of Notes of this  series.  Notes of this  series  acquired  or
redeemed  by the  Company  otherwise  than  through  [if  applicable,  insert  _
mandatory]  sinking  fund  payments  may  be  credited  against  subsequent  [if
applicable,  insert _ mandatory]  sinking fund payments otherwise required to be
made [if applicable, insert _ , in the inverse order in which they become due].]

      [If the Note is subject to redemption  of any kind,  insert _ In the event
of  redemption of this Note in part only, a new Note or Notes of this series and
of like tenor for the  unredeemed  portion  hereof will be issued in the name of
the Holder hereof upon the cancellation hereof.]

      [If applicable,  insert _ The Indenture contains provisions for defeasance
at any time of [the entire indebtedness of this Note] [or] [certain  restrictive
covenants and Events of Default with respect to this Note] [, in each case] upon
compliance with certain conditions set forth in the Indenture.]

      [If the Note is not an Original Issue Discount Note,  insert _ If an Event
of Default with  respect to Notes of this series shall occur and be  continuing,
the principal of the Notes of
                                       16

this  series may be  declared  due and payable in the manner and with the effect
provided in the Indenture.]

      [If the Note is an Original Issue  Discount Note,  insert _ If an Event of
Default with respect to Notes of this series shall occur and be  continuing,  an
amount of  principal of the Notes of this series may be declared due and payable
in the manner and with the effect  provided in the Indenture.  Such amount shall
be equal to _ insert formula for determining the amount. Upon payment (i) of the
amount of  principal  so  declared  due and  payable and (ii) of interest on any
overdue  principal,  premium and  interest  (in each case to the extent that the
payment of such  interest  shall be legally  enforceable),  all of the Company's
obligations  in  respect of the  payment of the  principal  of and  premium  and
interest, if any, on the Notes of this series shall terminate.]

      [If the Note is issued  before the Release  Date,  insert _ If an Event of
Default with respect to Notes of this series shall occur and be continuing,  the
principal  of the Notes may be  declared  due and payable in the manner and with
the effect provided in the Indenture and, upon such declaration, the Trustee can
demand the  acceleration  of the payment of  principal of the Senior Note Series
 ...... Bonds as provided in the Indenture.]

      The Indenture permits,  with certain  exceptions as therein provided,  the
amendment  thereof and the  modification  of the rights and  obligations  of the
Company and the rights of the Holders of the Notes of each series to be affected
under the  Indenture at any time by the Company and the Trustee with the consent
of the  Holders  of a  majority  in  principal  amount  of the Notes at the time
Outstanding  of  each  series  to  be  affected.  The  Indenture  also  contains
provisions  permitting the Holders of specified  percentages in principal amount
of the Notes of each series at the time Outstanding, on behalf of the Holders of
all Notes of such  series,  to waive  compliance  by the  Company  with  certain
provisions of the  Indenture  and certain past defaults  under the Indenture and
their consequences.  Any such consent or waiver by the Holder of this Note shall
be conclusive  and binding upon such Holder and upon all future  Holders of this
Note and of any Note  issued  upon the  registration  of  transfer  hereof or in
exchange therefor or in lieu hereof,  whether or not notation of such consent or
waiver is made upon this Note.

      As provided in and subject to the provisions of the Indenture,  the Holder
of this Note shall not have the right to institute any  proceeding  with respect
to the  Indenture  or for the  appointment  of a receiver  or trustee or for any
other  remedy  thereunder,  unless such Holder shall have  previously  given the
Trustee  written  notice of a  continuing  Event of Default  with respect to the
Notes of this series,  the Holders of not less than 25% in  principal  amount of
the Notes of this series at the time Outstanding shall have made written request
to the Trustee to institute  proceedings  in respect of such Event of Default as
Trustee and offered the Trustee reasonable indemnity,  and the Trustee shall not
have  received  from the Holders of a majority in  principal  amount of Notes of
this series at the time Outstanding a direction  inconsistent with such request,
and shall  have  failed to  institute  any such  proceeding,  for 60 days  after
receipt of such notice, request and offer of indemnity.  The foregoing shall not
apply to any suit  instituted by the Holder of this Note for the  enforcement of
any payment of  principal  hereof or any premium or interest  hereon on or after
the respective due dates expressed herein.
                                       17

      No reference  herein to the  Indenture and no provision of this Note or of
the  Indenture  shall alter or impair the  obligation  of the Company,  which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Note at the times,  place and rate, and in the coin or currency,  herein
prescribed.

      As provided in the  Indenture and subject to certain  limitations  therein
set forth,  the transfer of this Note is registrable in the Note Register,  upon
surrender of this Note for  registration  of transfer at the office or agency of
the Company in any place where the  principal of and any premium and interest on
this Note are payable,  duly endorsed by, or accompanied by a written instrument
of transfer in form  satisfactory  to the  Company and the Note  Registrar  duly
executed by, the Holder hereof or his attorney duly  authorized in writing,  and
thereupon one or more new Notes of this series and of like tenor,  of authorized
denominations and for the same aggregate principal amount, will be issued to the
designated transferee or transferees.

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

      No service charge shall be made for any such  registration  of transfer or
exchange,  but the Company may require  payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

      Prior to due presentment of this Note for  registration  of transfer,  the
Company,  the  Trustee and any agent of the Company or the Trustee may treat the
Person in whose  name  this  Note is  registered  as the  owner  hereof  for all
purposes,  whether or not this Note be overdue,  and neither  the  Company,  the
Trustee nor any such agent shall be affected by notice to the contrary.

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


SECTION 204.  Form of Legend for Global Notes.

      Unless  otherwise  specified as  contemplated by Section 301 for the Notes
evidenced thereby, every Global Note authenticated and delivered hereunder shall
bear a legend in substantially the following form:

THIS NOTE IS A GLOBAL  NOTE  WITHIN  THE  MEANING OF THE  INDENTURE  HEREINAFTER
REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE  THEREOF.
THIS NOTE MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A NOTE REGISTERED, AND NO
TRANSFER OF THIS NOTE IN WHOLE OR IN PART MAY BE REGISTERED,  IN THE NAME OF ANY
PERSON OTHER THAN SUCH  DEPOSITARY OR A NOMINEE  THEREOF,  EXCEPT IN THE LIMITED
CIRCUMSTANCES DESCRIBED IN THE INDENTURE.
                                       18

SECTION 205.  Form of Trustee's Certificate of Authentication.

      The Trustee's certificates of authentication shall be in substantially the
following form:

                        CERTIFICATION OF AUTHENTICATION

      This is one of the Notes of the series  designated  therein referred to in
the within-mentioned Indenture.


Dated:                                                     THE BANK OF NEW YORK,
                                                                      As Trustee


                                                    By..........................
                                                            Authorized Signatory


                                  ARTICLE THREE

                                    THE NOTES


SECTION 301.  Amount Unlimited; Issuable in Series.

      The aggregate  principal  amount of Notes which may be  authenticated  and
delivered under this Indenture is unlimited.

      The Notes may be issued in one or more series.  There shall be established
by or pursuant to a Board  Resolution and, subject to Section 303, set forth, or
determined in the manner provided, in an Officers'  Certificate,  or established
in one or more indentures supplemental hereto, prior to the issuance of Notes of
any series,

         (1) the title of the Notes of the series (which shall  distinguish  the
   Notes of the series from Notes of any other series);

         (2) any limit upon the aggregate  principal  amount of the Notes of the
   series which may be authenticated  and delivered under this Indenture (except
   for Notes authenticated and delivered upon registration of transfer of, or in
   exchange  for, or in lieu of,  other Notes of the series  pursuant to Section
   304,  305,  306,  1006 or 1207 and except for any Notes  which,  pursuant  to
   Section  303,  are  deemed  never to have been  authenticated  and  delivered
   hereunder);

         (3) the Person to whom any  interest  on a Note of the series  shall be
   payable,  if other  than the  Person in whose  name that Note (or one or more
   Predecessor  Notes) is  registered  at the close of  business  on the Regular
   Record Date for such interest;

         (4) the date or dates on which the principal of any Notes of the series
   is payable;

         (5) the rate or  rates at which  any  Notes of the  series  shall  bear
   interest,  if any,  the date or dates  from  which  any such  interest  shall
   accrue, the Interest Payment Dates on
                                       19

   which  any  such  interest   shall  be  payable,   the  manner  (if  any)  of
   determination  of such Interest Payment Dates and the Regular Record Date for
   any such interest payable on any Interest Payment Date;

         (6) the right,  if any, to extend the interest  payment periods and the
   duration of such extension;

         (7) the place or places  where the  principal  of and any  premium  and
   interest on any Notes of the series shall be payable;

         (8) the period or periods  within  which,  the price or prices at which
   and the terms and  conditions  upon  which  any  Notes of the  series  may be
   redeemed,  in whole or in part,  at the option of the  Company  and, if other
   than by a Board  Resolution,  the manner in which any election by the Company
   to redeem the Notes shall be evidenced;

         (9) the  obligation,  if any, of the Company to redeem or purchase  any
   Notes of the series  pursuant to any sinking fund or analogous  provisions or
   at the option of the Holder  thereof and the period or periods  within which,
   the price or prices at which  and the  terms and  conditions  upon  which any
   Notes of the series  shall be  redeemed  or  purchased,  in whole or in part,
   pursuant to such obligation;

         (10) if other than  denominations  of $1,000 and any integral  multiple
   thereof,  the  denominations  in  which  any  Notes  of the  series  shall be
   issuable;

         (11) if the amount of  principal  of or any  premium or interest on any
   Notes of the series may be determined  with reference to an index or pursuant
   to a formula, the manner in which such amounts shall be determined;

         (12) if other than the  currency of the United  States of America,  the
   currency,  currencies  or  currency  units in which the  principal  of or any
   premium  or  interest  on any Notes of the series  shall be  payable  and the
   manner of determining  the  equivalent  thereof in the currency of the United
   States of America for any purpose,  including for purposes of the  definition
   of "Outstanding" in Section 101;

         (13) if the principal of or any premium or interest on any Notes of the
   series  is to be  payable,  at the  election  of the  Company  or the  Holder
   thereof, in one or more currencies or currency units other than that or those
   in which such Notes are stated to be payable,  the  currency,  currencies  or
   currency  units in which the  principal of or any premium or interest on such
   Notes as to which such election is made shall be payable,  the periods within
   which and the terms and conditions upon which such election is to be made and
   the  amount  so  payable  (or the  manner  in  which  such  amount  shall  be
   determined);

         (14) if other than the entire principal amount thereof,  the portion of
   the  principal  amount of any Notes of the series which shall be payable upon
   declaration of acceleration of the Maturity thereof pursuant to Section 602;

         (15) if the  principal  amount  payable at the Stated  Maturity  of any
   Notes of the  series  will not be  determinable  as of any one or more  dates
   prior to the Stated Maturity,
                                       20

   the   amount    which   shall  be deemed to be the  principal  amount of such
   Notes as of any such date for any purpose thereunder or hereunder,  including
   the principal amount thereof which shall be due and payable upon any Maturity
   other than the Stated  Maturity or which shall be deemed to be Outstanding as
   of any date prior to the Stated Maturity (or, in any such case, the manner in
   which such amount deemed to be the principal amount shall be determined);

         (16) if  applicable,  that  the  Notes of the  series,  in whole or any
   specified part, shall be defeasible  pursuant to Section 1402 or Section 1403
   or both such Sections and, if other than by a Board Resolution, the manner in
   which any election by the Company to defease such Notes shall be evidenced;

         (17) if  applicable,  that any Notes of the series shall be issuable in
   whole or in part in the form of one or more  Global  Notes and, in such case,
   the respective  Depositaries for such Global Notes, the form of any legend or
   legends  which  shall be borne by any such  Global  Note in addition to or in
   lieu of that set forth in Section 204 and any circumstances in addition to or
   in lieu of those set forth in Clause (2) of the last paragraph of Section 305
   in which any such Global Note may be  exchanged in whole or in part for Notes
   registered,  and any  transfer of such Global Note in whole or in part may be
   registered,  in the name or names of Persons  other than the  Depositary  for
   such Global Note or a nominee thereof;

         (18) if any Notes of the series  shall be issued  prior to the  Release
   Date, the designation of the series of Senior Note First Mortgage Bonds to be
   delivered  to the Trustee in  connection  with the issuance of such series of
   Notes;

         (19) any addition to or change in the Events of Default  which  applies
   to any Notes of the series and any change in the right of the  Trustee or the
   requisite  Holders of such Notes to declare the principal  amount thereof due
   and payable pursuant to Section 602;

         (20) any  addition to or change in the  covenants  set forth in Article
   Eleven which applies to Notes of the series; and

         (21)  any  other  terms  of  the  series  (which  terms  shall  not  be
   inconsistent  with the provisions of this  Indenture,  except as permitted by
   Section 1001(5)).

      All Notes of any one series shall be substantially  identical except as to
denomination and except as may otherwise be provided in or pursuant to the Board
Resolution  referred  to above  and  (subject  to  Section  303) set  forth,  or
determined  in the manner  provided,  in the Officers'  Certificate  referred to
above or in any such indenture supplemental hereto.

      If any of the terms of the series are established by action taken pursuant
to a Board Resolution,  a copy of an appropriate  record of such action shall be
certified  by  the  Secretary  or an  Assistant  Secretary  of the  Company  and
delivered  to  the  Trustee  at or  prior  to  the  delivery  of  the  Officers'
Certificate setting forth the terms of the series.
                                       21

SECTION 302.  Denominations.

      The Notes of each series shall be issuable only in fully  registered  form
without  coupons  and  only in such  denominations  as  shall  be  specified  as
contemplated  by Section 301. In the absence of any such specified  denomination
with  respect  to the Notes of any  series,  the Notes of such  series  shall be
issuable in denominations of $1,000 and any integral multiple thereof.


SECTION 303.  Execution, Authentication, Delivery and Dating.

      Unless  otherwise  provided as contemplated by Section 301 with respect to
any series of Notes, the Notes shall be executed on behalf of the Company by its
Chairman of the Board,  its Vice Chairman of the Board,  its President or one of
its Vice  Presidents,  under its  corporate  seal affixed  thereto or reproduced
thereon  attested by its  Secretary  or one of its  Assistant  Secretaries.  The
signature of any of these officers on the Notes may be manual or facsimile.

      Notes bearing the manual or facsimile  signatures of individuals  who were
at any  time  the  proper  officers  of the  Company  shall  bind  the  Company,
notwithstanding  that such  individuals  or any of them have ceased to hold such
offices prior to the  authentication  and delivery of such Notes or did not hold
such offices at the date of such Notes.

      At any time and from time to time after the execution and delivery of this
Indenture,  the Company may deliver Notes of any series  executed by the Company
to the  Trustee  for  authentication,  together  with a  Company  Order  for the
authentication  and  delivery of such Notes and,  if prior to the Release  Date,
Senior Note First Mortgage Bonds of a series of Senior Note First Mortgage Bonds
conforming to the  requirements of Sections 401 and 402 hereof,  and the Trustee
in accordance with the Company Order shall  authenticate and deliver such Notes.
In  authenticating  such Notes,  and accepting the  additional  responsibilities
under this Indenture in relation to such Notes, the Trustee shall be entitled to
receive,  and (subject to Section 701) shall be fully protected in relying upon,
(1) if prior to the  Release  Date,  the  certificate  of an Expert  meeting the
requirements of Section 404(a) hereof and a series of Senior Note First Mortgage
Bonds  meeting the  requirements  of Section  403 hereof,  and (2) an Opinion of
Counsel stating,

         (A) if the form of such Notes has been  established  by or  pursuant to
   Board Resolution or in a supplemental  indenture as permitted by Section 201,
   that such form has been duly  authorized  by the Company and  established  in
   conformity with the provisions of this Indenture;

         (B) if the terms of such Notes have been duly authorized by the Company
   and  established  by or pursuant  to Board  Resolution  or in a  supplemental
   indenture as permitted by Section 301, that such terms have been  established
   in conformity with the provisions of this Indenture;

         (C) that such Notes,  when  authenticated  and delivered by the Trustee
   and  issued by the  Company  in the  manner  and  subject  to any  conditions
   specified  in such  Opinion of Counsel,  will have been duly issued under the
   Indenture and will constitute  valid and legally  binding  obligations of the
   Company,  entitled to the benefits provided by the Indenture, and enforceable
   in  accordance  with  their  terms,  subject to (a)  bankruptcy,  insolvency,
   fraudulent transfer, reorganization, moratorium and similar laws of general
                                       22

   applicability   relating   to  or  affecting creditors' rights and to general
   equity  principles,  (b) the  necessity  for  compliance  with the  statutory
   procedural  rights governing the exercise of remedies by a secured  creditor,
   and (c) the qualification that certain waivers,  proecedures,  remedies,  and
   other provisions of such Notes and this Indenture may be unenforceable  under
   or limited by the laws of the State of Arizona; and

         (D) if prior to the Release Date,  that the Senior Note First  Mortgage
   Bonds of the  related  series of  Senior  Note  First  Mortgage  Bonds  being
   delivered  to the Trustee in  connection  with the issuance of such series of
   Notes  have  been  duly  authorized,  executed,  authenticated,  issued,  and
   delivered,  constitute  valid and legally binding  obligations of the Company
   entitled to the benefits and security provided by the First Mortgage,  except
   as the  same  may be  limited  by (a)  general  principles  of  equity  or by
   bankruptcy,  insolvency,  reorganization,  arrangement,  moratorium, or other
   laws or equitable  principles  relating to or affecting  the  enforcement  of
   creditors'  rights  generally or the enforcement of the security  provided by
   the First  Mortgage,  (b) the  necessity  for  compliance  with the statutory
   procedural  requirements  governing  the  exercise  of  remedies by a secured
   creditor,  and  (c)  the  qualification  that  certain  waivers,  procedures,
   remedies,  and other  provisions of the Senior Note First  Mortgage Bonds and
   the First  Mortgage may be  unenforceable  under or limited by the law of the
   State of Arizona; and that such Senior Note First Mortgage Bonds are entitled
   to the benefits provided by the First Mortgage, equally and ratably, with all
   First  Mortgage  Bonds and other  Senior Note First  Mortgage  Bonds (if any)
   outstanding thereunder, except as to sinking fund provisions; and

         (E) that the Company's  execution and delivery of this Indenture,  such
   Notes,  such First  Mortgage,  and any such Senior Note First  Mortgage Bonds
   have been duly authorized by the Arizona Corporation  Commission (the "ACC"),
   the  ACC  had  jurisdiction  in  the  premises,   and  no  further  approval,
   authorization,  or consent of any other  public board or body is necessary to
   the validity of such  execution and delivery of this  Indenture,  such Notes,
   such First Mortgage, and any such Senior Note First Mortgage Bonds, except as
   may be required  under state  securities  or blue sky laws,  as to which laws
   such counsel shall not be required to express an opinion.

If such  form or terms  have  been so  established,  the  Trustee  shall  not be
required to authenticate  such Notes if the issue of such Notes pursuant to this
Indenture will affect the Trustee's own rights,  duties or immunities  under the
Notes  and this  Indenture  or  otherwise  in a manner  which is not  reasonably
acceptable to the Trustee.

      Notwithstanding  the  provisions  of  Section  301  and of  the  preceding
paragraph, if all Notes of a series are not to be originally issued at one time,
it shall  not be  necessary  to  deliver  the  Officers'  Certificate  otherwise
required  pursuant to Section  301 or the  Company  Order and Opinion of Counsel
otherwise  required  pursuant  to such  preceding  paragraph  at or prior to the
authentication of each Note of such series if such documents are delivered at or
prior to the  authentication  upon  original  issuance of the first Note of such
series to be issued.

      Each Note shall be dated the date of its authentication.

      No Note shall be entitled to any benefit under this  Indenture or be valid
or obligatory for any purpose unless there appears on such Note a certificate of
authentication  substantially  in the form  provided for herein  executed by the
Trustee by manual  signature of an authorized  signatory,  and such  certificate
upon any Note shall be conclusive  evidence,  and the only  evidence,  that such
Note has been duly authenticated and delivered hereunder.
                                       23

Notwithstanding  the foregoing,  if any Note shall have been  authenticated  and
delivered  hereunder  but never issued and sold by the Company,  and the Company
shall deliver such Note to the Trustee for  cancellation  as provided in Section
309, for all purposes of this  Indenture such Note shall be deemed never to have
been  authenticated  and delivered  hereunder and shall never be entitled to the
benefits of this Indenture.


SECTION 304.  Temporary Notes.

      Pending the preparation of definitive Notes of any series, the Company may
execute,  and upon Company  Order the Trustee  shall  authenticate  and deliver,
temporary Notes which are printed,  lithographed,  typewritten,  mimeographed or
otherwise produced, in any authorized  denomination,  substantially of the tenor
of the  definitive  Notes  in lieu of  which  they  are  issued  and  with  such
appropriate  insertions,  omissions,  substitutions  and other variations as the
officers executing such Notes may determine,  as evidenced by their execution of
such Notes.

      If  temporary  Notes of any  series are  issued,  the  Company  will cause
definitive Notes of that series to be prepared without unreasonable delay. After
the preparation of definitive Notes of such series,  the temporary Notes of such
series shall be exchangeable  for definitive Notes of such series upon surrender
of the temporary  Notes of such series at the office or agency of the Company in
a Place of Payment for that series, without charge to the Holder. Upon surrender
for  cancellation of any one or more temporary Notes of any series,  the Company
shall  execute  and the  Trustee  shall  authenticate  and  deliver in  exchange
therefor  one or more  definitive  Notes of the same series,  of any  authorized
denominations  and of like  tenor  and  aggregate  principal  amount.  Until  so
exchanged,  the temporary  Notes of any series shall in all respects be entitled
to the same benefits under this Indenture as definitive Notes of such series and
tenor.


SECTION 305.  Registration, Registration of Transfer and Exchange.

      The Company  shall cause to be kept at the  Corporate  Trust Office of the
Trustee a  register  (the  register  maintained  in such  office or in any other
office or agency of the  Company in a Place of Payment  being  herein  sometimes
referred  to as the  "Note  Register")  in  which,  subject  to such  reasonable
regulations as it may prescribe,  the Company shall provide for the registration
of Notes and of  transfers  of Notes.  The  Trustee  is hereby  appointed  "Note
Registrar" for the purpose of registering Notes and transfers of Notes as herein
provided.

      Upon surrender for registration of transfer of any Note of a series at the
office or agency of the  Company  in a Place of  Payment  for that  series,  the
Company shall execute,  and the Trustee shall  authenticate and deliver,  in the
name of the designated  transferee or transferees,  one or more new Notes of the
same series,  of any  authorized  denominations  and of like tenor and aggregate
principal amount.

      At the option of the  Holder,  Notes of any series  may be  exchanged  for
other Notes of the same  series,  of any  authorized  denominations  and of like
tenor  and  aggregate  principal  amount,  upon  surrender  of the  Notes  to be
exchanged at such office or agency.  Whenever any Notes are so  surrendered  for
exchange,  the Company shall  execute,  and the Trustee shall  authenticate  and
deliver, the Notes which the Holder making the exchange is entitled to receive.
                                       24

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

      Every Note presented or surrendered  for  registration  of transfer or for
exchange  shall (if so required by the Company or the Trustee) be duly endorsed,
or be accompanied by a written  instrument of transfer in form  satisfactory  to
the Company and the Note Registrar  duly executed,  by the Holder thereof or his
attorney duly authorized in writing.

      No  service  charge  shall be made for any  registration  of  transfer  or
exchange of Notes,  but the Company may require  payment of a sum  sufficient to
cover any tax or other  governmental  charge  that may be imposed in  connection
with any  registration  of transfer or exchange of Notes,  other than  exchanges
pursuant to Section 304, 1006 or 1207 not involving any transfer.

      If the Notes of any series (or of any series and  specified  tenor) are to
be  redeemed,  the Company  shall not be  required  (A) to issue,  register  the
transfer  of or  exchange  any  Notes  of that  series  (or of that  series  and
specified tenor, as the case may be) during a period beginning at the opening of
business 15 days before the day of the mailing of a notice of  redemption of any
such Notes  selected for  redemption  and ending at the close of business on the
day of such mailing,  or (B) to register the transfer of or exchange any Note so
selected for redemption in whole or in part,  except the  unredeemed  portion of
any Note being redeemed in part.

      The  provisions of Clauses (1), (2), (3) and (4) below shall apply only to
Global Notes:

         (1) Each  Global  Note  authenticated  under  this  Indenture  shall be
   registered in the name of the Depositary designated for such Global Note or a
   nominee  thereof and  delivered to such  Depositary  or a nominee  thereof or
   custodian therefor,  and each such Global Note shall constitute a single Note
   for all purposes of this Indenture.

         (2)  Notwithstanding  any other provision in this Indenture,  no Global
   Note  may be  exchanged  in whole or in part  for  Notes  registered,  and no
   transfer of a Global Note in whole or in part may be registered,  in the name
   of any Person  other than the  Depositary  for such  Global Note or a nominee
   thereof  unless (A) such  Depositary  (i) has notified the Company that it is
   unwilling  or unable to continue as  Depositary  for such Global Note or (ii)
   has ceased to be a clearing  agency  registered  under the Exchange  Act, (B)
   there shall have  occurred and be continuing an Event of Default with respect
   to such Global Note or (C) there shall exist such  circumstances,  if any, in
   addition  to or in lieu of the  foregoing  as have  been  specified  for this
   purpose as contemplated by Section 301.

         (3)  Subject to Clause (2) above,  any  exchange  of a Global  Note for
   other Notes may be made in whole or in part, and all Notes issued in exchange
   for a Global Note or any portion thereof shall be registered in such names as
   the Depositary for such Global Note shall direct.

         (4)  Every  Note  authenticated  and  delivered  upon  registration  of
   transfer  of, or in exchange  for or in lieu of, a Global Note or any portion
   thereof, whether pursuant to this
                                       25

   Section,    Section   304,   306,  1006  or  1207 or  otherwise,   shall   be
   authenticated  and  delivered  in the form of,  and shall be, a Global  Note,
   unless  such  Note is  registered  in the  name of a  Person  other  than the
   Depositary for such Global Note or a nominee thereof.


SECTION 306.  Mutilated, Destroyed, Lost and Stolen Notes.

      If any mutilated  Note is  surrendered  to the Trustee,  the Company shall
execute and the Trustee shall  authenticate  and deliver in exchange  therefor a
new Note of the same series and of like tenor and principal amount and bearing a
number not contemporaneously outstanding.

      If there shall be delivered to the Company and the Trustee (i) evidence to
their  satisfaction of the destruction,  loss or theft of any Note and (ii) such
security  or  indemnity  as may be required by them to save each of them and any
agent of either of them harmless,  then, in the absence of notice to the Company
or the Trustee that such Note has been  acquired by a bona fide  purchaser,  the
Company shall execute and the Trustee shall authenticate and deliver, in lieu of
any such  destroyed,  lost or stolen  Note, a new Note of the same series and of
like  tenor and  principal  amount and  bearing a number  not  contemporaneously
outstanding.

      In case any such mutilated,  destroyed,  lost or stolen Note has become or
is about to become due and payable,  the Company in its discretion may,  instead
of issuing a new Note, pay such Note.

      Upon the  issuance  of any new Note under this  Section,  the  Company may
require the payment of a sum  sufficient to cover any tax or other  governmental
charge that may be imposed in relation thereto and any other expenses (including
the fees and expenses of the Trustee) connected therewith.

      Every new Note of any series  issued  pursuant to this  Section in lieu of
any  destroyed,  lost or stolen Note shall  constitute  an  original  additional
contractual  obligation of the Company,  whether or not the  destroyed,  lost or
stolen Note shall be at any time enforceable by anyone, and shall be entitled to
all the benefits of this Indenture equally and proportionately  with any and all
other Notes of that series duly issued hereunder.

      The  provisions of this Section are  exclusive and shall  preclude (to the
extent lawful) all other rights and remedies with respect to the  replacement or
payment of mutilated, destroyed, lost or stolen Notes.


SECTION 307.  Payment of Interest; Interest Rights Preserved.

      Except as otherwise  provided as  contemplated by Section 301 with respect
to any series of Notes, interest on any Note which is payable, and is punctually
paid or duly  provided  for, on any  Interest  Payment Date shall be paid to the
Person in whose name that Note (or one or more Predecessor  Notes) is registered
at the close of business on the Regular Record Date for such interest.
                                       26

      Any  interest  on any  Note of any  series  which is  payable,  but is not
punctually  paid or duly  provided  for, on any  Interest  Payment  Date (herein
called  "Defaulted  Interest") shall forthwith cease to be payable to the Holder
on the relevant  Regular  Record Date by virtue of having been such Holder,  and
such  Defaulted  Interest  may be paid by the  Company,  at its election in each
case, as provided in Clause (1) or (2) below:

         (1) The Company may elect to make payment of any Defaulted  Interest to
   the  Persons in whose  names the Notes of such  series  (or their  respective
   Predecessor  Notes)  are  registered  at the close of  business  on a Special
   Record Date for the payment of such Defaulted Interest,  which shall be fixed
   in the following  manner.  The Company shall notify the Trustee in writing of
   the amount of  Defaulted  Interest  proposed  to be paid on each Note of such
   series and the date of the proposed payment, and at the same time the Company
   shall  deposit  with the  Trustee an amount of money  equal to the  aggregate
   amount  proposed  to be paid in respect of such  Defaulted  Interest or shall
   make  arrangements  satisfactory to the Trustee for such deposit prior to the
   date of the proposed  payment,  such money when deposited to be held in trust
   for the benefit of the Persons entitled to such Defaulted Interest as in this
   Clause  provided.  Thereupon the Trustee shall fix a Special  Record Date for
   the payment of such  Defaulted  Interest which shall be not more than 15 days
   and not less than 10 days prior to the date of the  proposed  payment and not
   less than 10 days  after the  receipt  by the  Trustee  of the  notice of the
   proposed  payment.  The  Trustee  shall  promptly  notify the Company of such
   Special Record Date and, in the name and at the expense of the Company, shall
   cause  notice of the  proposed  payment of such  Defaulted  Interest  and the
   Special  Record  Date  therefor  to be given to each  Holder of Notes of such
   series in the manner set forth in Section 106, not less than 10 days prior to
   such Special  Record Date.  Notice of the proposed  payment of such Defaulted
   Interest and the Special  Record Date  therefor  having been so mailed,  such
   Defaulted  Interest  shall be paid to the Persons in whose names the Notes of
   such series (or their  respective  Predecessor  Notes) are  registered at the
   close of business on such Special  Record Date and shall no longer be payable
   pursuant to the following Clause (2).

         (2) The Company may make payment of any Defaulted Interest on the Notes
   of  any  series  in  any  other  lawful  manner  not  inconsistent  with  the
   requirements  of any  securities  exchange on which such Notes may be listed,
   and upon such notice as may be required by such  exchange,  if,  after notice
   given by the Company to the Trustee of the proposed  payment pursuant to this
   Clause, such manner of payment shall be deemed practicable by the Trustee.

      Subject to the foregoing  provisions of this Section,  each Note delivered
under this Indenture upon  registration  of transfer of or in exchange for or in
lieu of any other Note shall  carry the rights to  interest  accrued and unpaid,
and to accrue, which were carried by such other Note.


SECTION 308.  Persons Deemed Owners.

      Prior to due  presentment  of a Note for  registration  of  transfer,  the
Company,  the  Trustee and any agent of the Company or the Trustee may treat the
Person in whose name such Note is  registered  as the owner of such Note for the
purpose of receiving payment of
                                       27

principal  of and any premium and  (subject to Section 307) any interest on such
Note and for all other purposes whatsoever, whether or not such Note be overdue,
and neither the Company, the Trustee nor any agent of the Company or the Trustee
shall be affected by notice to the contrary.


SECTION 309.  Cancellation.

      All Notes surrendered for payment, redemption, registration of transfer or
exchange or for credit against any sinking fund payment shall, if surrendered to
any Person  other than the  Trustee,  be  delivered  to the Trustee and shall be
promptly cancelled by it. The Company may at any time deliver to the Trustee for
cancellation any Notes previously  authenticated  and delivered  hereunder which
the Company may have acquired in any manner  whatsoever,  and may deliver to the
Trustee (or to any other Person for  delivery to the  Trustee) for  cancellation
any Notes  previously  authenticated  hereunder which the Company has not issued
and sold, and all Notes so delivered shall be promptly cancelled by the Trustee.
No  Notes  shall  be  authenticated  in lieu  of or in  exchange  for any  Notes
cancelled as provided in this  Section,  except as  expressly  permitted by this
Indenture.  All  cancelled  Notes held by the  Trustee  shall be  disposed of as
directed by a Company Order;  provided,  however,  that the Trustee shall not be
required to destroy such cancelled Notes.


SECTION 310.  Computation of Interest.

      Except as otherwise  specified as contemplated by Section 301 for Notes of
any series,  interest on the Notes of each series shall be computed on the basis
of a 360-day year of twelve 30-day months.


SECTION 311.  CUSIP Numbers.

         The  Company  in issuing  the Notes may use  "CUSIP"  numbers  (if then
generally in use),  and, if so, the Trustee shall use "CUSIP" numbers in notices
of  redemption as a  convenience  to Holders;  provided that any such notice may
state  that no  representation  is made as to the  correctness  of such  numbers
either as printed on the Notes or as contained in any notice of a redemption and
that reliance may be placed only on the other identification  numbers printed on
the Notes,  and any such  redemption  shall not be  affected by any defect in or
omission of such numbers.


SECTION 312.   Payments on Senior Note First Mortgage Bonds.

      Subject to Article Five and Article Fourteen hereof,  all payments made by
the Company to the Trustee on a series of Senior Note First Mortgage Bonds shall
be applied by the Trustee to pay, when due,  principal of, premium,  if any, and
interest  on the related  series of Notes and,  to the extent so applied,  shall
satisfy the Company's  obligations  on such Notes.  The Company shall pay to the
Trustee  principal of, premium,  if any, and interest on a series of Senior Note
First Mortgage Bonds in a manner and at a time that will enable the
                                       28

Trustee to make payments when due, of the  principal  of,  premium,  if any, and
interest on the related series of Notes.


                                  ARTICLE FOUR

                        SENIOR NOTE FIRST MORTGAGE BONDS

SECTION 401.  Acceptance of Senior Note First Mortgage Bonds.

         At or prior to the time of issuance of a series of Notes  hereunder  at
any time prior to the Release Date, the Company shall deliver to the Trustee for
the benefit of the Holders of the Notes as described in Section 403 hereof,  and
the Trustee shall accept therefor,  Senior Note First Mortgage Bonds of a series
of Senior Note First  Mortgage Bonds not  theretofore  delivered to the Trustee,
registered  in the name of the Trustee and  conforming  to the  requirements  of
Section 402 hereof.


SECTION 402.  Terms of Senior Note First Mortgage Bonds.

         Each  series of Senior  Note  First  Mortgage  bonds  delivered  to the
Trustee  pursuant  to Section  401  hereof  shall have the same rate or rates of
interest (or interest  calculated in the same manner),  interest  payment dates,
maturity and redemption provisions, and shall be in the same aggregate principal
amount, as the related series of Notes being issued.


SECTION 403.  Senior Note First Mortgage Bonds as Security for Notes.

         Until the Release Date and subject to Article Five and Article Fourteen
hereof,  Senior  Note First  Mortgage  Bonds  delivered  to the  Trustee for the
benefit of the Holders of a related  series of Notes shall serve as security for
any and all  obligations  of the  Company  under such  related  series of Notes,
including,  but not limited to (1) the full and prompt  payment of the principal
and  premium,  if any,  on such Notes when and as the same shall  become due and
payable in accordance  with the terms and  provisions  of this  Indenture or the
Notes either at the Stated Maturity  thereof,  upon acceleration of the maturity
thereof or upon redemption,  and (2) the full and prompt payment of any interest
on such Notes when and as the same shall  become due and  payable in  accordance
with the terms and provisions of this Indenture or the Notes.

         Notwithstanding  anything in this  Indenture to the contrary,  from and
after the Release  Date,  the  obligation  of the Company to make  payment  with
respect to the principal of and premium, if any, and interest on the Senior Note
First Mortgage Bonds shall be deemed satisfied and discharged as provided in the
supplemental  trust indenture or indentures to the First Mortgage  creating such
Senior First Mortgage Bonds and the Senior Note First Mortgage Bonds shall cease
to secure in any manner Notes theretofore or subsequently issued. From and after
the Release Date, all Notes,  whether theretofore or subsequently  issued, shall
be unsecured,  and any  conditions to the issuance of Notes that refer or relate
to Senior Note First Mortgage Bonds or the First Mortgage shall be inapplicable.
Following  the Release Date,  the Company  shall cause the First  Mortgage to be
closed and the
                                       29

Company shall not issue any additional First Mortgage Bonds or Senior Note First
Mortgage Bonds under the First Mortgage. Notice of the occurrence of the Release
Date  shall be given by the  Trustee  to the  Holders of the Notes in the manner
provided  for in Section  106  hereof  not later than 30 days after the  Company
notifies the Trustee of the occurrence of the Release Date.


SECTION 404.  Fair Value Certificate.

         (a) Upon the  delivery  by the  Company to the  Trustee of Senior  Note
First  Mortgage  Bonds  pursuant  to  Section  401  hereof,  the  Company  shall
simultaneously  therewith  deliver to the Trustee a certificate of an Expert (1)
stating  that it is  familiar  with the  provisions  of such  Senior  Note First
Mortgage Bonds and of this  Indenture;  (2)  identifying  such Senior Note First
Mortgage  Bonds;  (3)  identifying  the  Notes  being  issued  contemporaneously
therewith  and (4)  stating  the fair value to the  Company of such  Senior Note
First Mortgage  Bonds. If the fair value to the Company of the Senior Note First
Mortgage  Bonds so delivered,  as described in the  certificate  to be delivered
pursuant to this Section 404(a), both (l) is equal to or exceeds (A) $25,000 and
(B) 1% of the principal amount of the Notes  outstanding at the date of delivery
of such Senior Note First Mortgage Bonds and (2) together with the fair value to
the Company, as described in the certificates delivered pursuant to this Section
404(a),  of all other Senior Note First Mortgage Bonds  delivered to the Trustee
since the commencement of the then current calendar year, is equal to or exceeds
10% of the principal amount of the Notes  outstanding at the date of delivery of
such Senior Note First Mortgage  Bonds,  then the  certificate  required by this
Section 404(a) shall (1) be delivered by an independent Expert and (2) shall, in
addition  to the  certifications  described  above,  state the fair value to the
Company of all  Senior  Note  First  Mortgage  Bonds  delivered  to the  Trustee
pursuant to Section 401 hereof since the  commencement  of the then current year
as to which a certificate was not delivered by an independent Expert.

         (b) If Senior Note First Mortgage Bonds are delivered or surrendered to
the  Company  pursuant  to  Section  407  or  409  hereof,   the  Company  shall
simultaneously  therewith  deliver to the Trustee a certificate of an Expert (1)
stating  that it is  familiar  with the  provisions  of such  Senior  Note First
Mortgage Bonds and of this  Indenture,  (2)  identifying  such Senior Note First
Mortgage Bonds,  (3) if applicable,  identifying  the Notes,  the payment of the
interest on and principal of which has been  discharged  hereunder,  (4) stating
that such  delivery or surrender  will not impair the lien of this  Indenture in
contravention  of the  provisions  of this  Indenture.  If, prior to the Release
Date,  the fair value of the Senior Note First  Mortgage  Bonds so delivered and
surrendered,  as described in the  certificate to be delivered  pursuant to this
Section  404(b),  both (l) is equal to or exceeds  (A) $25,000 and (B) 1% of the
principal  amount of the Notes  outstanding at the date of delivery or surrender
of such Senior Note First  Mortgage  Bonds and (2) together with the fair value,
as described in the certificates  delivered  pursuant to this Section 404(b), of
all other  Senior  Note  First  Mortgage  Bonds  released  from the lien of this
Indenture since the  commencement of the then current calendar year, is equal to
or exceeds 10% of the principal  amount of the Notes  outstanding at the date of
delivery  or  surrender  of such  Senior  Note First  Mortgage  Bonds,  then the
certificate required by this Section 404(b) shall be delivered by an independent
Expert.
                                       30

         If, in connection  with a delivery or surrender of  outstanding  Senior
Note First  Mortgage Bonds provided for in subsection (a) or (b) of this Section
404,  as the case may be,  the  Company  provides  to the  trustee an Opinion of
Counsel stating that the certificate  described by the applicable  subsection is
not  required by law,  such  certificate  shall not be required to be  delivered
hereunder in connection with such delivery or surrender.


SECTION 405.  Senior Note First Mortgage Bonds Held by the Trustee.

         The Trustee,  as a Holder of Senior Note First  Mortgage  Bonds,  shall
attend a meeting of holders of First  Mortgage Bonds under the First Mortgage as
to which it receives due notice,  or, at its option,  shall deliver its proxy in
connection  therewith.  Either at such  meeting,  or otherwise  where consent of
holders  of First  Mortgage  Bonds  issued  under the First  Mortgage  is sought
without a meeting,  the Trustee shall vote all of the Senior Note First Mortgage
Bonds held by it, or shall consent or withhold its consent with respect thereto,
as directed by the  Holders of not less than a majority in  aggregate  principal
amount of the Outstanding Notes;  provided,  however, that the Trustee shall not
vote as such holder of a particular  series of Senior Note First  Mortgage Bonds
in favor of, or give its consent to, any action which, in the Trustee's opinion,
would  materially  adversely  affect such  series of Senior Note First  Mortgage
Bonds in a manner not shared  generally by all other Senior Note First  Mortgage
Bonds,  except  upon  notification  by the Trustee to the Holders of the related
series of Outstanding  Notes of such proposal and consent thereto of the holders
of not less than a majority in  aggregate  principal  amount of the  Outstanding
Notes of such series.


SECTION 406.  No Transfer of Senior Note First Mortgage Bonds; Exception.

         Except as required to effect an assignment to a successor trustee under
this  Indenture  or pursuant  to Section 407 or Section 409 hereof,  the Trustee
shall not sell,  assign or transfer the Senior Note First Mortgage Bonds and the
Company shall issue stop transfer  instructions to the Mortgage  Trustee and any
transfer agent under the First Mortgage to effect  compliance  with this Section
406.


SECTION 407.  Delivery to the Company of all Senior Note First Mortgage Bonds.

         When the  obligation of the Company to make payment with respect to the
principal of and premium, if any, and interest on the Senior Note First Mortgage
Bonds shall be satisfied or deemed  satisfied  pursuant to Section 403,  Section
501 or Article Fourteen hereof,  the Trustee shall,  upon written request of the
Company and receipt of the certificate of the Expert described in Section 404(b)
hereof (if such certificate is then required by Section 404(b) hereof),  deliver
to the Company  without  charge  therefor all of the Senior Note First  Mortgage
Bonds, together with such appropriate  instruments of transfer or release as may
be reasonably  requested by the Company.  All Senior Note First  Mortgage  Bonds
delivered to the Company in accordance  with this Section 407 shall be delivered
by the Company to the First Mortgage Trustee for cancellation.
                                       31

SECTION 408.  Further Assurances.

         The Company, at its own expense,  shall do such further lawful acts and
things,  and execute  and  deliver  such  additional  conveyances,  assignments,
assurances,   agreements,  financing  statements  and  instruments,  as  may  be
necessary in order to further assign, assure, perfect and confirm to the Trustee
its  security  interest  in  the  Senior  Note  First  Mortgage  Bonds  and  for
maintaining, protecting and preserving such security interest.


SECTION 409.  Exchange and Surrender of Senior Note First Mortgage Bonds.

         At any time upon receipt of a Company Order at the written direction of
the  Company,  the  Trustee  shall  surrender  to the Company all or part of the
Senior  Note First  Mortgage  Bonds in exchange  for Senior Note First  Mortgage
Bonds equal in aggregate  principal amounts to, in different  denominations than
but of the same  series and with all other terms  identical  to, the Senior Note
First Mortgage Bonds so surrendered to the Company.  In addition,  at any time a
Note shall  cease to be entitled  to any lien,  benefit or  security  under this
Indenture  pursuant to Section 501 or Article Fourteen hereof, the Trustee shall
surrender an equal  principal  amount of Senior Note First Mortgage Bonds of the
related series to the Company for cancellation. The Trustee shall, together with
such Senior Note First Mortgage Bonds,  deliver to the Company such  appropriate
instruments of transfer or release as the Company may reasonably request.  Prior
to the surrender required by this paragraph,  the Trustee shall receive from the
Company the  following,  and  (subject  to Section  701  hereof)  shall be fully
protected  in  relying  upon,  (a) an  Officer's  Certificate  stating  (i)  the
aggregate  outstanding  principal amount of the Senior Note First Mortgage bonds
of the series surrendered by the Trustee, after giving effect to such surrender,
(ii) the aggregate  Outstanding principal amount of the related series of Notes,
(iii) that the surrender of the Senior Note First Mortgage Bonds will not result
in any  default  under  this  Indenture,  and (iv) that any  Senior  Note  First
Mortgage  Bonds to be received in  exchange  for the Senior Note First  Mortgage
Bonds being surrendered comply with the provisions of this Section.

         The Company  shall not be permitted to cause the  surrender or exchange
of all or any part of a series of Senior Note First Mortgage Bonds  contemplated
in this Section, if, after such surrender or exchange, the aggregate outstanding
principal  amount of the  related  series of Notes  would  exceed the  aggregate
outstanding  principal amount of such series of Senior Note First Mortgage Bonds
held by the  Trustee.  Any Senior  Note First  Mortgage  Bonds  received  by the
Company  pursuant to this Section 409 shall be delivered to the Mortgage Trustee
for cancellation.
                                       32

                                  ARTICLE FIVE

                           SATISFACTION AND DISCHARGE


SECTION 501.  Satisfaction and Discharge of Indenture.

      This  Indenture  shall upon Company  Request cease to be of further effect
(except as to any surviving  rights of  registration  of transfer or exchange of
Notes herein  expressly  provided for),  and the Trustee,  at the expense of the
Company,  shall  execute  proper  instruments  acknowledging   satisfaction  and
discharge of this Indenture, when

      (1)   either

            (A) all Notes  theretofore  authenticated  and delivered (other than
      (i) Notes  which have been  destroyed,  lost or stolen and which have been
      replaced  or paid as  provided  in  Section  306 and (ii)  Notes for whose
      payment money has  theretofore  been  deposited in trust or segregated and
      held in trust by the  Company  and  thereafter  repaid to the  Company  or
      discharged  from such  trust,  as  provided  in  Section  1103)  have been
      delivered to the Trustee for cancellation; or

            (B) all such Notes not  theretofore  delivered  to the  Trustee  for
      cancellation

                  (i) have become due and payable, or

                  (ii) will  become  due and  payable at their  Stated  Maturity
            within one year, or

                  (iii) are to be called  for  redemption  within one year under
            arrangements satisfactory to the Trustee for the giving of notice of
            redemption  by the Trustee in the name,  and at the expense,  of the
            Company,

      and the Company, in the case of (i), (ii) or (iii) above, has deposited or
      caused to be  deposited  with the  Trustee as trust funds in trust for the
      purpose  money in an amount  sufficient  to pay and  discharge  the entire
      indebtedness  on such Notes not  theretofore  delivered to the Trustee for
      cancellation,  for  principal  and any premium and interest to the date of
      such  deposit (in the case of Notes which have become due and  payable) or
      to the Stated Maturity or Redemption Date, as the case may be;

      (2) the  Company  has paid or  caused to be paid all  other  sums  payable
   hereunder by the Company; and

      (3) the Company has delivered to the Trustee an Officers'  Certificate and
   an  Opinion   of   Counsel,  each  stating   that  all  conditions  precedent
   herein  provided  for  relating  to  the  satisfaction  and discharge of this
   Indenture have been complied with.

      Notwithstanding  the  satisfaction  and discharge of this  Indenture,  the
obligations of the Company to the Trustee under Section 707, the  obligations of
the Company to any  Authenticating  Agent under  Section 714 and, if money shall
have been deposited with the Trustee
                                       33

pursuant to subclause (B) of Clause (1) of this Section,  the obligations of the
Trustee under Section 502 and the last paragraph of Section 1103 shall survive.

      If the Notes are deemed paid and  discharged  pursuant to this Section 501
or defeased pursuant to Article Fourteen,  the obligation of the Company to make
payment  with respect to the  principal of and premium,  if any, and interest on
the Senior Note First  Mortgage  Bonds shall be  satisfied  and  discharged,  as
provided in the supplemental trust indenture or indentures to the First Mortgage
creating  such  Senior  Note  First  Mortgage  Bonds and the  Senior  Note First
Mortgage Bonds shall cease to secure the Notes in any manner.

      If the Company  shall have paid or caused to be paid the  principal of and
premium,  if any,  and  interest  on any Note,  as and when the same  shall have
become due and payable or the Company  shall have  delivered  to the Trustee for
cancellation  any outstanding  Note, such Note shall cease to be entitled to any
lien,  benefit  or  security  under  this  Indenture.  Upon a Note of any series
ceasing to be entitled to any lien,  benefit or security  under this  Indenture,
the  obligation  of the Company to make payment with respect to principal of and
premium,  if any,  and interest on a principal  amount of the related  series of
Senior  Note First  Mortgage  Bonds equal to the  principal  amount of such Note
shall be satisfied and  discharged  and such portion of the principal  amount of
such  Senior  Note First  Mortgage  Bonds shall cease to secure the Notes in any
manner.


SECTION 502.  Application of Trust Money.

      Subject to the provisions of the last paragraph of Section 1103, all money
deposited  with the  Trustee  pursuant to Section 501 shall be held in trust and
applied  by it,  in  accordance  with  the  provisions  of the  Notes  and  this
Indenture,  to  the  payment,  either  directly  or  through  any  Paying  Agent
(including  the  Company  acting as its own  Paying  Agent) as the  Trustee  may
determine, to the Persons entitled thereto, of the principal and any premium and
interest for whose payment such money has been deposited with the Trustee.


                                   ARTICLE SIX

                                    REMEDIES


SECTION 601.  Events of Default.

      "Event of  Default",  wherever  used herein  with  respect to Notes of any
series,  means any one of the  following  events  (whatever  the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body):

         (1) default in the payment of any interest upon any Note of that series
   when it becomes due and payable, and continuance of such default for a period
   of 60 days; or
                                       34

         (2)  default in the payment of the  principal  of or any premium on any
   Note of that series at its  Maturity  and  continuance  of such default for 5
   days; or

         (3) default in the deposit of any sinking fund payment, when and as due
   by the terms of a Note of that series and  continuance  of such default for 5
   days; or

         (4) default in the performance,  or breach, of any covenant or warranty
   of the Company in this Indenture (other than a covenant or warranty a default
   in  whose   performance   or  whose  breach  is  elsewhere  in  this  Section
   specifically  dealt  with  or  which  has  expressly  been  included  in this
   Indenture  solely for the benefit of series of Notes other than that series),
   and continuance of such default or breach for a period of 90 days after there
   has been  given,  by  registered  or  certified  mail,  to the Company by the
   Trustee or to the  Company  and the  Trustee by the  Holders of a majority in
   principal  amount of the  Outstanding  Notes of that series a written  notice
   specifying such default or breach and requiring it to be remedied and stating
   that such notice is a "Notice of Default" hereunder; or

         (5) prior to the  Release  Date,  a Default  (as  defined  in the First
   Mortgage)  has occurred and is  continuing,  and the  Mortgage  Trustee,  the
   Company  or Holders of at least 25% in  principal  amount of the  outstanding
   Notes shall have given written notice thereof to the Trustee;

         (6) the entry by a court having  jurisdiction  in the premises of (A) a
   decree or order for relief in respect of the Company in an  involuntary  case
   or proceeding under any applicable  Federal or State bankruptcy,  insolvency,
   reorganization  or other  similar law or (B) a decree or order  adjudging the
   Company a bankrupt or  insolvent,  or approving as properly  filed a petition
   seeking  reorganization,  arrangement,  adjustment  or  composition  of or in
   respect  of the  Company  under  any  applicable  Federal  or State  law,  or
   appointing a custodian, receiver, liquidator, assignee, trustee, sequestrator
   or other similar  official of the Company or of any  substantial  part of its
   property,  or ordering the winding up or liquidation of its affairs,  and the
   continuance  of any such decree or order for relief or any such other  decree
   or order unstayed and in effect for a period of 90 consecutive days;

         (7) the  commencement  by the Company of a voluntary case or proceeding
   under any applicable Federal or State bankruptcy, insolvency,  reorganization
   or other similar law or of any other case or  proceeding to be  adjudicated a
   bankrupt or insolvent, or the consent by it to the entry of a decree or order
   for relief in respect of the  Company in an  involuntary  case or  proceeding
   under any applicable Federal or State bankruptcy, insolvency,  reorganization
   or other similar law or to the  commencement  of any bankruptcy or insolvency
   case or proceeding against it, or the filing by it of a petition or answer or
   consent  seeking  reorganization  or relief under any  applicable  Federal or
   State law,  or the  consent by it to the  filing of such  petition  or to the
   appointment  of or taking  possession by a custodian,  receiver,  liquidator,
   assignee,  trustee,  sequestrator or other similar official of the Company or
   of any substantial part of its property, or the making by it of an assignment
   for the  benefit  of  creditors,  or the  admission  by it in  writing of its
   inability  to pay its debts  generally  as they  become due, or the taking of
   corporate action by the Company in furtherance of any such action; or

         (8) any other Event of Default  provided  with respect to Notes of that
   series.
                                       35

SECTION 602.  Acceleration of Maturity; Rescission and Annulment.

      If an Event of  Default  (other  than an Event  of  Default  specified  in
Section  601(6)  or  601(7))  with  respect  to Notes of any  series at the time
Outstanding occurs and is continuing, then in every such case the Trustee or the
Holders of a  majority  in  principal  amount of the  Outstanding  Notes of that
series may declare the principal  amount of all the Notes of that series (or, if
any Notes of that series are Original Issue Discount Notes,  such portion of the
principal  amount of such Notes as may be specified by the terms  thereof) to be
due and payable  immediately,  by a notice in writing to the Company (and to the
Trustee  if given by  Holders),  and upon any such  declaration  such  principal
amount (or specified  amount) shall become  immediately  due and payable.  If an
Event of Default  specified in Section 601(6) or 601(7) with respect to Notes of
any series at the time Outstanding occurs, the principal amount of all the Notes
of that  series (or, if any Notes of that  series are  Original  Issue  Discount
Notes, such portion of the principal amount of such Notes as may be specified by
the terms thereof)  shall  automatically,  and without any  declaration or other
action on the part of the  Trustee or any  Holder,  become  immediately  due and
payable. Upon such Notes becoming immediately due and payable, by declaration or
otherwise,  pursuant to any of the foregoing provisions of this Section 602, the
Trustee shall  immediately  file with the Mortgage  Trustee a written demand for
the  acceleration  of the payment of principal of all Senior Note First Mortgage
Bonds  relating to such series of  outstanding  Notes pursuant to the applicable
provisions of the supplemental  indenture to the First Mortgage relating to such
Senior Note First Mortgage Bonds.

      At any time after such a declaration of acceleration with respect to Notes
of any series has been made and before a judgment  or decree for  payment of the
money due has been  obtained  by the  Trustee  as  hereinafter  in this  Article
provided,  and prior to the receipt by the Trustee from the Mortgage  Trustee of
an  irrevocable,   valid  and  unconditional   notice  to  the  Trustee  of  the
acceleration of the payment of principal, by declaration or otherwise, of all of
the Senior Note First  Mortgage  Bonds  relating  to such  series of Notes,  the
related Event of Default and its consequences (including,  if given, the written
demand for the  acceleration of the payment of principal of all such Senior Note
First Mortgage Bonds) will be  automatically  waived,  resulting in an automatic
rescission and annulment of the acceleration of the Notes if

      (1) the Company has paid or deposited with the Trustee a sum sufficient to
pay

            (A) all overdue interest on all Notes of that series,

            (B) the  principal  of (and  premium,  if any, on) any Notes of that
      series  which  have  become  due  otherwise  than by such  declaration  of
      acceleration  and any  interest  thereon  at the rate or rates  prescribed
      therefor in such Notes,

            (C) to the extent that payment of such interest is lawful,  interest
      upon  overdue  interest at the rate or rates  prescribed  therefor in such
      Notes, and

            (D) all sums  paid or  advanced  by the  Trustee  hereunder  and the
      reasonable  compensation,  expenses,  disbursements  and  advances  of the
      Trustee, its agents and counsel;

   and
                                       36

         (2) all Events of Default with  respect to Notes of that series,  other
   than the  non-payment  of the  principal  of Notes of that series  which have
   become  due  solely by such  declaration  of  acceleration,  have been  cured
   (including  any Defaults (as defined in the First  Mortgage)  under the First
   Mortgage,  as  evidenced by notice  thereof  received by the Trustee from the
   Mortgage  Trustee)  or waived as  provided  in Section 613 or under the First
   Mortgage.

No such  rescission  shall  affect  any  subsequent  default or impair any right
consequent thereon.


SECTION 603.  Collection of Indebtedness and Suits for Enforcement by Trustee.

         The Company covenants that if

         (1)  default is made in the  payment of any  interest  on any Note when
   such interest becomes due and payable and such default continues for a period
   of 60 days, or

         (2) default is made in the payment of the principal of (or premium,  if
   any, on) any Note at the Maturity  thereof and such default  continues  for a
   period of 5 days,

the Company will, upon demand of the Trustee,  pay to it, for the benefit of the
Holders of such Notes,  the whole  amount then due and payable on such Notes for
principal  and any premium and interest  and, to the extent that payment of such
interest  shall be legally  enforceable,  interest on any overdue  principal and
premium and on any overdue interest, at the rate or rates prescribed therefor in
such Notes, and, in addition thereto, such further amount as shall be sufficient
to cover  the  costs  and  expenses  of  collection,  including  the  reasonable
compensation,  expenses,  disbursements and advances of the Trustee,  its agents
and counsel.

      If an Event of Default with  respect to Notes of any series  occurs and is
continuing, the Trustee may in its discretion proceed to protect and enforce its
rights  (including,  prior to the Release Date,  any rights that the Trustee may
have as a holder of Senior Note First Mortgage  Bonds of the series  relating to
the series of such  Notes) and the rights of the Holders of Notes of such series
by  such  appropriate  judicial  proceedings  as the  Trustee  shall  deem  most
effectual  to protect  and  enforce any such  rights,  whether for the  specific
enforcement  of any  covenant or  agreement  in this  Indenture or in aid of the
exercise of any power granted herein, or to enforce any other proper remedy.


SECTION 604.  Trustee May File Proofs of Claim.

      In case of any judicial  proceeding  relative to the Company (or any other
obligor upon the Notes),  its property or its  creditors,  the Trustee  shall be
entitled and empowered, by intervention in such proceeding or otherwise, to take
any and all actions  authorized  under the Trust  Indenture Act in order to have
claims of the Holders and the Trustee (including, prior to the Release Date, any
claims of the Trustee as holder of Senior Note First Mortgage  Bonds) allowed in
any such proceeding.  In particular,  the Trustee shall be authorized to collect
and  receive any moneys or other  property  payable or  deliverable  on any such
claims  and to  distribute  the same;  and any  custodian,  receiver,  assignee,
trustee,  liquidator,  seque-strator  or  other  similar  official  in any  such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee  and, in the event that the Trustee  shall  consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount
                                       37

due it for the reasonable compensation,  expenses, disbursements and advances of
the Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 707.

      No provision of this Indenture shall be deemed to authorize the Trustee to
authorize  or  consent to or accept or adopt on behalf of any Holder any plan of
reorganization,  arrangement,  adjustment or composition  affecting the Notes or
the rights of any Holder  thereof or to authorize the Trustee to vote in respect
of the claim of any Holder in any such proceeding;  provided,  however, that the
Trustee  may, on behalf of the  Holders,  vote for the  election of a trustee in
bankruptcy or similar  official and be a member of a creditors' or other similar
committee.


SECTION 605.  Trustee May Enforce Claims Without Possession of Notes.

      All rights of action and claims  under this  Indenture or the Notes may be
prosecuted  and  enforced by the Trustee  without the  possession  of any of the
Notes or the production thereof in any proceeding relating thereto, and any such
proceeding instituted by the Trustee shall be brought in its own name as trustee
of an express trust, and any recovery of judgment shall, after provision for the
payment of the reasonable compensation,  expenses, disbursements and advances of
the Trustee,  its agents and counsel,  be for the ratable benefit of the Holders
of the Notes in respect of which such judgment has been recovered.


SECTION 606.  Application of Money Collected.

      Any money  collected  by the  Trustee  pursuant to this  Article  shall be
applied in the following  order,  at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any premium
or interest,  upon  presentation  of the Notes and the  notation  thereon of the
payment if only partially paid and upon surrender thereof if fully paid:

      FIRST:  To the payment of all amounts due the Trustee under Section 707;

      SECOND: To the payment of the amounts then due and unpaid for principal of
   and any  premium  and  interest  on the Notes in  respect of which or for the
   benefit of which such money has been collected,  ratably,  without preference
   or  priority  of any kind,  according  to the amounts due and payable on such
   Notes for principal and any premium and interest, respectively; and

      THIRD: To the payment of the balance,  if any, to the Company or any other
   Person or Persons legally entitled thereto.


SECTION 607.  Limitation on Suits.

      No Holder of any Note of any series shall have any right to institute  any
proceeding,  judicial or otherwise,  with respect to this Indenture,  or for the
appointment of a receiver or trustee, or for any other remedy hereunder, unless
                                       38

         (1) such Holder has previously given written notice to the Trustee of a
   continuing Event of Default with respect to the Notes of that series;

         (2) the  Holders  of not  less  than  25% in  principal  amount  of the
   Outstanding  Notes of that  series  shall  have made  written  request to the
   Trustee to institute  proceedings  in respect of such Event of Default in its
   own name as Trustee hereunder;

         (3) such  Holder or  Holders  have  offered to the  Trustee  reasonable
   indemnity  against  the costs,  expenses  and  liabilities  to be incurred in
   compliance with such request;

         (4) the Trustee for 60 days after its receipt of such  notice,  request
   and offer of indemnity has failed to institute any such proceeding; and

         (5) no direction  inconsistent with such written request has been given
   to the  Trustee  during  such  60-day  period by the Holders of a majority in
   principal amount of the Outstanding Notes of that series;

it being  understood and intended that no one or more of such Holders shall have
any right in any manner  whatever by virtue of, or by availing of, any provision
of this  Indenture to affect,  disturb or  prejudice  the rights of any other of
such Holders,  or to obtain or to seek to obtain priority or preference over any
other of such  Holders or to enforce any right under this  Indenture,  except in
the manner herein  provided and for the equal and ratable benefit of all of such
Holders.


SECTION 608.  Unconditional Right of Holders to Receive Principal,
   Premium and Interest.

      Notwithstanding  any other provision in this Indenture,  the Holder of any
Note shall have the  right,  which is  absolute  and  unconditional,  to receive
payment of the  principal  of and any  premium  and  (subject  to  Section  307)
interest on such Note on the respective Stated Maturities expressed in such Note
(or, in the case of redemption,  on the  Redemption  Date) and to institute suit
for the  enforcement of any such payment,  and such rights shall not be impaired
without the consent of such Holder.


SECTION 609.  Restoration of Rights and Remedies.

      If the Trustee or any Holder has  instituted any proceeding to enforce any
right or remedy under this Indenture and such  proceeding has been  discontinued
or abandoned for any reason, or has been determined  adversely to the Trustee or
to such Holder,  then and in every such case,  subject to any  determination  in
such  proceeding,  the  Company,  the Trustee and the Holders  shall be restored
severally and  respectively to their former  positions  hereunder and thereafter
all rights and remedies of the Trustee and the Holders shall  continue as though
no such proceeding had been instituted.
                                       39

SECTION 610.  Rights and Remedies Cumulative.

      Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Notes in the last paragraph of Section 306,
no right or remedy  herein  conferred  upon or reserved to the Trustee or to the
Holders is intended  to be  exclusive  of any other  right or remedy,  and every
right and remedy shall,  to the extent  permitted by law, be  cumulative  and in
addition to every other right and remedy  given  hereunder  or now or  hereafter
existing at law or in equity or  otherwise.  The  assertion or employment of any
right or remedy  hereunder,  or  otherwise,  shall not  prevent  the  concurrent
assertion or employment of any other appropriate right or remedy.


SECTION 611.  Delay or Omission Not Waiver.

      No delay or  omission  of the  Trustee  or of any  Holder  of any Notes to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or  constitute  a waiver of any such Event of Default or an
acquiescence therein.  Every right and remedy given by this Article or by law to
the Trustee or to the Holders may be exercised  from time to time,  and as often
as may be deemed  expedient,  by the Trustee or by the Holders,  as the case may
be.


SECTION 612.  Control by Holders.

      The Holders of a majority in principal amount of the Outstanding  Notes of
any  series  shall  have the  right to  direct  the  time,  method  and place of
conducting any proceeding for any remedy available to the Trustee, or exercising
any trust or power  conferred on the Trustee,  with respect to the Notes of such
series, provided that

         (1) such  direction  shall not be in  conflict  with any rule of law or
   with this Indenture,

         (2) the Trustee may take any other action  deemed proper by the Trustee
   which is not inconsistent with such direction, and

         (3) subject to the  provisions  of Section 701, the Trustee  shall have
   the right to  decline  to follow any such  direction  if the  Trustee in good
   faith shall, by a Responsible  Officer or Officers of the Trustee,  determine
   that the  proceeding  so  directed  would  involve  the  Trustee in  personal
   liability.


SECTION 613.  Waiver of Past Defaults.

      The  Holders  of not less  than a  majority  in  principal  amount  of the
Outstanding Notes of any series may on behalf of the Holders of all the Notes of
such series waive any past default hereunder with respect to such series and its
consequences, except a default

         (1) in the  payment of the  principal  of or any premium or interest on
   any Note of such series, or
                                       40

         (2) in respect of a covenant or provision  hereof  which under  Article
   Ten cannot be modified  or amended  without the consent of the Holder of each
   Outstanding Note of such series affected.

      Upon any such waiver,  such default shall cease to exist, and any Event of
Default arising  therefrom shall be deemed to have been cured, for every purpose
of this  Indenture;  but no such waiver shall extend to any  subsequent or other
default or impair any right consequent thereon.


SECTION 614.  Undertaking for Costs.

      In any  suit  for the  enforcement  of any  right  or  remedy  under  this
Indenture,  or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit to
file an  undertaking to pay the costs of such suit, and may assess costs against
any such party  litigant,  in the manner and to the extent provided in the Trust
Indenture  Act;  provided that neither this Section nor the Trust  Indenture Act
shall be deemed to authorize any court to require such an undertaking or to make
such an assessment in any suit instituted by the Company or the Trustee.


SECTION 615.  Waiver of Usury, Stay or Extension Laws.

      The Company  covenants  (to the extent that it may lawfully do so) that it
will not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or  advantage  of, any usury,  stay or  extension  law wherever
enacted,  now or at any time hereafter in force,  which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and  covenants  that it will not hinder,  delay or impede the  execution  of any
power herein granted to the Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.


                                  ARTICLE SEVEN

                                   THE TRUSTEE


SECTION 701.  Certain Duties and Responsibilities.

      The duties and responsibilities of the Trustee shall be as provided by the
Trust Indenture Act, and no implied  covenants or obligations shall be read into
the Indenture against the Trustee.  The phrase "default (as such term is defined
in such  indenture)"  as it appears in Section  315 of the Trust  Indenture  Act
shall mean an Event of Default  with  respect to a series of Notes  which  shall
have occurred and is continuing.  Notwithstanding the foregoing, no provision of
this  Indenture  shall  require  the  Trustee to expend or risk its own funds or
otherwise incur any financial  liability in the performance of any of its duties
hereunder,  or in the exercise of any of its rights or powers,  if it shall have
reasonable  grounds  for  believing  that  repayment  of such funds or  adequate
indemnity  against  such risk or  liability  is not  reasonably  assured  to it.
Whether or not therein expressly so provided,  every provision of this Indenture
relating to the conduct or affecting the liability of or affording protection to
the Trustee shall be subject to the provisions of this Section.
                                       41

SECTION 702.  Notice of Defaults.

      If a default  occurs  hereunder  with respect to Notes of any series,  the
Trustee  shall give the Holders of Notes of such series  notice of such  default
known to the Trustee as and to the extent  provided by the Trust  Indenture Act;
provided, however, that in the case of any default of the character specified in
Section  601(4) with respect to Notes of such series,  no such notice to Holders
shall be given  until at least 30 days  after the  occurrence  thereof.  For the
purpose of this Section,  the term "default"  means any event which is, or after
notice or lapse of time or both would  become,  an Event of Default with respect
to Notes of such series.


SECTION 703.  Certain Rights of Trustee.

      Subject to the provisions of Section 701:

         (1) the Trustee may rely and shall be protected in acting or refraining
   from acting upon any resolution, certificate, statement, instrument, opinion,
   report, notice, request,  direction,  consent, order, bond, debenture,  note,
   other evidence of indebtedness  or other paper or document  believed by it to
   be  genuine  and to have been  signed or  presented  by the  proper  party or
   parties;

         (2) any request or direction of the Company  mentioned  herein shall be
   sufficiently  evidenced  by a  Company  Request  or  Company  Order,  and any
   resolution  of the Board of Directors  shall be  sufficiently  evidenced by a
   Board Resolution;

         (3) whenever in the  administration of this Indenture the Trustee shall
   deem it  desirable  that a matter be proved or  established  prior to taking,
   suffering  or  omitting  any action  hereunder,  the  Trustee  (unless  other
   evidence be herein specifically  prescribed) may, in the absence of bad faith
   on its part, rely upon an Officers' Certificate;

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

         (5) the Trustee  shall be under no  obligation  to exercise  any of the
   rights or powers  vested in it by this  Indenture at the request or direction
   of any of the Holders  pursuant to this Indenture,  unless such Holders shall
   have  offered to the Trustee  reasonable  security or  indemnity  against the
   costs,  expenses and liabilities  which might be incurred by it in compliance
   with such request or direction;

         (6) the Trustee shall not be bound to make any  investigation  into the
   facts  or  matters  stated  in  any   resolution,   certificate,   statement,
   instrument,  opinion,  report, notice,  request,  direction,  consent, order,
   bond,  debenture,  note,  other  evidence of  indebtedness  or other paper or
   document,  but the Trustee, in its discretion,  may make such further inquiry
   or  investigation  into such facts or matters as it may see fit,  and, if the
   Trustee shall  determine to make such further  inquiry or  investigation,  it
   shall be entitled to examine the books,  records and premises of the Company,
   personally or by agent or attorney;
                                       42

         (7) the Trustee may  execute any of the trusts or powers  hereunder  or
   perform  any duties  hereunder  either  directly  or by or through  agents or
   attorneys  and the Trustee  shall not be  responsible  for any  misconduct or
   negligence on the part of any agent or attorney appointed with due care by it
   hereunder; and

         (8) except as other provided in Section  601(4),  the Trustee shall not
   be charged with  knowledge of any default or Event of Default  unless  either
   (i) a  Responsible  Officer of the Trustee  assigned to the  Corporate  Trust
   Department  of the Trustee (or any  successor  division or  department of the
   Trustee) shall have actual  knowledge of the default or Event of Default,  or
   (ii) written notice of such default or Event of Default shall have been given
   to the  Trustee  by the  Company,  any other  obligor  on the Notes or by any
   Holder  of such  Notes or, in the case of an Event of  Default  described  in
   Section  601(5)  by the  Mortgage  Trustee  or  Holders  of at  least  25% in
   principal amount of the Outstanding Notes.


SECTION 704.  Not Responsible for Recitals or Issuance of Notes.

      The  recitals  contained  herein  and in the Notes,  except the  Trustee's
certificates of authentication, shall be taken as the statements of the Company,
and neither the Trustee nor any Authenticating  Agent assumes any responsibility
for their  correctness.  The Trustee makes no representations as to the validity
or sufficiency  of this  Indenture or of the Notes or as to the value,  title or
validity of any Senior Note First Mortgage Bonds or other securities at any time
pledged or deposited  with the Trustee  hereunder or as to the security  offered
thereby or hereby.  Neither the Trustee  nor any  Authenticating  Agent shall be
accountable  for the use or  application by the Company of Notes or the proceeds
thereof or of any moneys paid to the Company  under any  provision  hereof.  The
Trustee shall not be  responsible  for recording or filing this  Indenture,  any
indenture  supplemented hereto or any financing or continuation statement in any
public office or elsewhere at any time or times.


SECTION 705.  May Hold Notes.

      The  Trustee,  any  Authenticating  Agent,  any  Paying  Agent,  any  Note
Registrar  or any other agent of the  Company,  in its  individual  or any other
capacity,  may become the owner or pledgee of Notes and, subject to Sections 608
and 613, may otherwise  deal with the Company with the same rights it would have
if it were not Trustee,  Authenticating  Agent,  Paying Agent, Note Registrar or
such other agent.


SECTION 706.  Money Held in Trust.

      Money held by the Trustee in trust  hereunder need not be segregated  from
other funds except to the extent  required by law. The Trustee shall be under no
liability for interest on any money received by it hereunder except as otherwise
agreed in writing with the Company.
                                       43

SECTION 707.  Compensation and Reimbursement.

      The Company agrees

         (1) to pay to the Trustee from time to time such  compensation as shall
   be agreed to in writing  between the Company and the Trustee for all services
   rendered  by it  hereunder  (which  compensation  shall not be limited by any
   provision  of law in regard to the  compensation  of a trustee  of an express
   trust);

         (2) except as otherwise  expressly  provided  herein,  to reimburse the
   Trustee  upon its  request for all  reasonable  expenses,  disbursements  and
   advances  incurred or made by the Trustee in accordance with any provision of
   this Indenture  (including the reasonable  compensation  and the expenses and
   disbursements   of  its  agents  and  counsel),   except  any  such  expense,
   disbursement  or  advance as may be  attributable  to its  negligence  or bad
   faith; and

         (3) to indemnify the Trustee for, and to hold it harmless against,  any
   loss,  liability or expense incurred  without  negligence or bad faith on its
   part,  arising out of or in connection with the acceptance or  administration
   of the trust or  trusts  hereunder,  including  the  costs  and  expenses  of
   defending  itself  against  any claim or  liability  in  connection  with the
   exercise or performance of any of its powers or duties hereunder.

      The  Trustee  shall have a lien prior to the Notes upon all  property  and
funds held by it hereunder  for any amount owing it or any  predecessor  Trustee
pursuant to this Section 707, except with respect to funds held in trust for the
benefit of the Holders of particular Notes.

      Without limiting any rights available to the Trustee under applicable law,
when the Trustee incurs expenses or renders services in connection with an Event
of  Default  specified  in  Section  601(6)  or  Section  601(7),  the  expenses
(including  the  reasonable  charges  and  expenses  of  its  counsel)  and  the
compensation   for  the  services  are  intended  to   constitute   expenses  of
administration  under any applicable Federal or State bankruptcy,  insolvency or
other similar law.

      The  provisions  of this Section  shall  survive the  termination  of this
Indenture.


SECTION 708.  Conflicting Interests.

      If the  Trustee has or shall  acquire a  conflicting  interest  within the
meaning of the Trust  Indenture  Act, the Trustee  shall either  eliminate  such
interest or resign,  to the extent and in the manner provided by, and subject to
the provisions  of, the Trust  Indenture Act and this  Indenture.  To the extent
permitted  by such Act,  the Trustee  shall not be deemed to have a  conflicting
interest by virtue of being a trustee under this Indenture with respect to Notes
of more than one series.
                                       44

SECTION 709.  Corporate Trustee Required; Eligibility.

      There  shall at all  times be one (and only one)  Trustee  hereunder  with
respect to the Notes of each series, which may be Trustee hereunder for Notes of
one or more  other  series.  Each  Trustee  shall be a Person  that is  eligible
pursuant to the Trust  Indenture  Act to act as such and has a combined  capital
and surplus of at least  $50,000,000.  If any such Person  publishes  reports of
condition  at least  annually,  pursuant  to law or to the  requirements  of its
supervising or examining authority, then for the purposes of this Section and to
the extent  permitted  by the Trust  Indenture  Act,  the  combined  capital and
surplus of such Person shall be deemed to be its combined capital and surplus as
set forth in its most recent  report of condition so  published.  If at any time
the Trustee  with  respect to the Notes of any series shall cease to be eligible
in accordance with the provisions of this Section,  it shall resign  immediately
in the manner and with the effect hereinafter specified in this Article.


SECTION 710.  Resignation and Removal; Appointment of Successor.

      No resignation or removal of the Trustee and no appointment of a successor
Trustee  pursuant to this Article shall become effective until the acceptance of
appointment  by  the  successor   Trustee  in  accordance  with  the  applicable
requirements of Section 711.

      The  Trustee  may  resign at any time with  respect to the Notes of one or
more series by giving written  notice thereof to the Company.  If the instrument
of acceptance by a successor Trustee required by Section 711 shall not have been
delivered  to the  Trustee  within 30 days  after the  giving of such  notice of
resignation,   the  resigning  Trustee  may  petition  any  court  of  competent
jurisdiction  for the  appointment  of a successor  Trustee  with respect to the
Notes of such series.

      The  Trustee  may be removed at any time with  respect to the Notes of any
series  by  Act  of  the  Holders  of a  majority  in  principal  amount  of the
Outstanding Notes of such series, delivered to the Trustee and to the Company.

      If at any time:

         (1) the  Trustee  shall fail to comply with  Section 708 after  written
   request  therefor  by the  Company  or by any Holder who has been a bona fide
   Holder of a Note for at least six months, or

         (2) the Trustee shall cease to be eligible  under Section 709 and shall
   fail to resign after written  request  therefor by the Company or by any such
   Holder, or

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

then,  in any such case,  (A) the Company by a Board  Resolution  may remove the
Trustee with respect to all Notes, or (B) subject to Section 614, any Holder who
has been a bona
                                       45

fide  Holder of a Note for at least six months may, on behalf of himself and all
others similarly situated,  petition any court of competent jurisdiction for the
removal  of the  Trustee  with  respect  to all Notes and the  appointment  of a
successor Trustee or Trustees.

      If the Trustee shall resign,  be removed or become incapable of acting, or
if a vacancy shall occur in the office of Trustee for any cause, with respect to
the Notes of one or more  series,  the  Company,  by a Board  Resolution,  shall
promptly  appoint a successor  Trustee or Trustees  with respect to the Notes of
that or those series (it being understood that any such successor Trustee may be
appointed  with  respect  to the Notes of one or more or all of such  series and
that at any time there  shall be only one Trustee  with  respect to the Notes of
any  particular  series) and shall comply with the  applicable  requirements  of
Section  711.  If,   within  one  year  after  such   resignation,   removal  or
incapability,  or the  occurrence  of such  vacancy,  a successor  Trustee  with
respect to the Notes of any series shall be appointed by Act of the Holders of a
majority in principal  amount of the Outstanding  Notes of such series delivered
to the Company and the  retiring  Trustee,  the  successor  Trustee so appointed
shall,  forthwith upon its acceptance of such appointment in accordance with the
applicable  requirements  of Section  711,  become the  successor  Trustee  with
respect to the Notes of such series and to that extent  supersede  the successor
Trustee  appointed by the Company.  If no successor  Trustee with respect to the
Notes of any series  shall have been so  appointed by the Company or the Holders
and accepted  appointment in the manner  required by Section 711, any Holder who
has been a bona fide  Holder of a Note of such  series  for at least six  months
may, on behalf of himself and all others similarly situated,  petition any court
of  competent  jurisdiction  for the  appointment  of a successor  Trustee  with
respect to the Notes of such series.

      The Company shall give notice of each  resignation and each removal of the
Trustee  with  respect  to the Notes of any  series  and each  appointment  of a
successor  Trustee  with  respect to the Notes of any  series to all  Holders of
Notes of such series in the manner  provided in Section  106.  Each notice shall
include  the name of the  successor  Trustee  with  respect to the Notes of such
series and the address of its Corporate Trust Office.


SECTION 711.  Acceptance of Appointment by Successor.

      In case of the appointment  hereunder of a successor  Trustee with respect
to  all  Notes,  every  such  successor  Trustee  so  appointed  shall  execute,
acknowledge and deliver to the Company and to the retiring Trustee an instrument
accepting  such  appointment,  and thereupon the  resignation  or removal of the
retiring Trustee shall become effective and such successor Trustee,  without any
further  act,  deed or  conveyance,  shall  become  vested  with all the rights,
powers,  trusts and duties of the retiring Trustee,  including rights, title and
interest in the Senior  Note First  Mortgage  Bonds;  but, on the request of the
Company or the successor  Trustee,  such retiring Trustee shall, upon payment of
its charges,  execute and deliver an instrument  transferring  to such successor
Trustee all the rights, powers and trusts of the retiring Trustee and shall duly
assign,  transfer and deliver to such  successor  Trustee all property and money
held by such retiring Trustee hereunder.

      In case of the appointment  hereunder of a successor  Trustee with respect
to the Notes of one or more (but not all)  series,  the  Company,  the  retiring
Trustee  and each  successor  Trustee  with  respect to the Notes of one or more
series shall execute and deliver an
                                       46

indenture  supplemental  hereto wherein each successor Trustee shall accept such
appointment and which (1) shall contain such provisions as shall be necessary or
desirable to transfer and confirm to, and to vest in, each successor Trustee all
the rights,  powers,  trusts and duties of the retiring  Trustee with respect to
the Notes of that or those  series to which the  appointment  of such  successor
Trustee relates, (2) if the retiring Trustee is not retiring with respect to all
Notes,  shall contain such provisions as shall be deemed  necessary or desirable
to confirm  that all the  rights,  powers,  trusts  and  duties of the  retiring
Trustee  with  respect  to the  Notes of that or those  series  as to which  the
retiring  Trustee is not  retiring  shall  continue to be vested in the retiring
Trustee,  and (3) shall add to or change any of the provisions of this Indenture
as shall be necessary to provide for or  facilitate  the  administration  of the
trusts  hereunder by more than one  Trustee,  it being  understood  that nothing
herein  or  in  such  supplemental  indenture  shall  constitute  such  Trustees
co-trustees  of the same trust and that each such Trustee  shall be trustee of a
trust or trusts hereunder  separate and apart from any trust or trusts hereunder
administered  by any other such Trustee;  and upon the execution and delivery of
such  supplemental  indenture the resignation or removal of the retiring Trustee
shall become  effective to the extent  provided  therein and each such successor
Trustee,  without any further act, deed or conveyance,  shall become vested with
all the rights,  powers,  trusts and duties of the retiring Trustee with respect
to the Notes of that or those series to which the  appointment of such successor
Trustee relates;  but, on request of the Company or any successor Trustee,  such
retiring  Trustee  shall duly  assign,  transfer  and deliver to such  successor
Trustee all  property and money held by such  retiring  Trustee  hereunder  with
respect to the Notes of that or those  series to which the  appointment  of such
successor Trustee relates.

      Upon request of any such successor Trustee,  the Company shall execute any
and all  instruments  for more fully and certainly  vesting in and confirming to
such  successor  Trustee all such rights,  powers and trusts  referred to in the
first or second preceding paragraph, as the case may be.

      No successor  Trustee shall accept its  appointment  unless at the time of
such  acceptance  such  successor  Trustee shall be qualified and eligible under
this Article.


SECTION 712.  Merger, Conversion, Consolidation or Succession to Business.

      Any corporation  into which the Trustee may be merged or converted or with
which it may be  consolidated,  or any  corporation  resulting  from any merger,
conversion  or  consolidation  to which  the  Trustee  shall be a party,  or any
corporation  succeeding to all or substantially all the corporate trust business
of the Trustee,  shall be the successor of the Trustee hereunder,  provided such
corporation  shall be  otherwise  qualified  and  eligible  under this  Article,
without the  execution  or filing of any paper or any further act on the part of
any of the parties hereto. In case any Notes shall have been authenticated,  but
not  delivered,  by the  Trustee  then  in  office,  any  successor  by  merger,
conversion  or  consolidation  to such  authenticating  Trustee  may adopt  such
authentication and deliver the Notes so authenticated with the same effect as if
such successor Trustee had itself authenticated such Notes.
                                       47

SECTION 713.  Preferential Collection of Claims Against Company.

      If and when the  Trustee  shall be or become a creditor of the Company (or
any  other  obligor  upon  the  Notes),  the  Trustee  shall be  subject  to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company (or any such other obligor).


SECTION 714.  Appointment of Authenticating Agent.

      The Trustee may appoint an Authenticating  Agent or Agents with respect to
one or more series of Notes which  shall be  authorized  to act on behalf of the
Trustee to authenticate Notes of such series issued upon exchange,  registration
of transfer or partial  redemption thereof or pursuant to Section 306, and Notes
so  authenticated  shall be entitled to the benefits of this Indenture and shall
be valid and  obligatory  for all  purposes as if  authenticated  by the Trustee
hereunder.  Wherever  reference is made in this Indenture to the  authentication
and  delivery  of  Notes  by  the  Trustee  or  the  Trustee's   certificate  of
authentication,  such reference  shall be deemed to include  authentication  and
delivery on behalf of the Trustee by an  Authenticating  Agent and a certificate
of authentication  executed on behalf of the Trustee by an Authenticating Agent.
Each  Authenticating  Agent shall be  acceptable to the Company and shall at all
times be a corporation organized and doing business under the laws of the United
States of America,  any State  thereof or the District of  Columbia,  authorized
under such laws to act as  Authenticating  Agent,  having a combined capital and
surplus of not less than  $50,000,000  and subject to supervision or examination
by Federal or State authority. If such Authenticating Agent publishes reports of
condition  at least  annually,  pursuant to law or to the  requirements  of said
supervising or examining  authority,  then for the purposes of this Section, the
combined capital and surplus of such Authenticating  Agent shall be deemed to be
its  combined  capital  and  surplus as set forth in its most  recent  report of
condition so published. If at any time an Authenticating Agent shall cease to be
eligible in accordance with the provisions of this Section,  such Authenticating
Agent shall resign  immediately  in the manner and with the effect  specified in
this Section.

      Any  corporation  into  which an  Authenticating  Agent  may be  merged or
converted or with which it may be  consolidated,  or any  corporation  resulting
from any merger,  conversion or consolidation to which such Authenticating Agent
shall be a party,  or any  corporation  succeeding  to the  corporate  agency or
corporate  trust business of an  Authenticating  Agent,  shall continue to be an
Authenticating  Agent,  provided such  corporation  shall be otherwise  eligible
under this Section,  without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

      An  Authenticating  Agent may resign at any time by giving  written notice
thereof to the Trustee and to the Company. The Trustee may at any time terminate
the agency of an  Authenticating  Agent by giving written notice thereof to such
Authenticating  Agent  and to the  Company.  Upon  receiving  such a  notice  of
resignation  or  upon  such  a  termination,   or  in  case  at  any  time  such
Authenticating  Agent  shall  cease  to  be  eligible  in  accordance  with  the
provisions of this Section,  the Trustee may appoint a successor  Authenticating
Agent  which  shall be  acceptable  to the Company and shall give notice of such
appointment in the manner provided in Section 106 to all Holders of Notes of the
series with respect to which such Authenticating Agent will serve. Any successor
Authenticating  Agent upon acceptance of its appointment  hereunder shall become
vested with all the rights, powers and duties of its
                                       48

predecessor   hereunder,   with  like  effect  as  if  originally  named  as  an
Authenticating  Agent.  No  successor  Authenticating  Agent shall be  appointed
unless eligible under the provisions of this Section.

      The Company agrees to pay to each  Authenticating  Agent from time to time
reasonable compensation for its services under this Section.

      If an  appointment  with respect to one or more series is made pursuant to
this Section, the Notes of such series may have endorsed thereon, in addition to
the Trustee's  certificate  of  authentication,  an  alternative  certificate of
authentication in the following form:

      This is one of the Notes of the series  designated  therein referred to in
the within-mentioned Indenture.


                                                           THE BANK OF NEW YORK,
                                                                      As Trustee



                                                  By............................
                                                         As Authenticating Agent



                                                  By............................
                                                              Authorized Officer
                                       49

                                  ARTICLE EIGHT

                HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY


SECTION 801.  Company to Furnish Trustee Names and Addresses of Holders.

      The Company will furnish or cause to be furnished to the Trustee

         (1) fifteen days after each Regular  Record Date, a list,  in such form
   as the Trustee may  reasonably  require,  of the names and  addresses  of the
   Holders of Notes of each series as of such Regular Record Date, and

         (2) at such other times as the  Trustee may request in writing,  within
   30 days after the  receipt  by the  Company  of any such  request,  a list of
   similar form and content as of a date not more than 15 days prior to the time
   such list is furnished;

excluding from any such list names and addresses  received by the Trustee in its
capacity as Note Registrar.


SECTION 802.  Preservation of Information; Communications to Holders.

      The  Trustee  shall  preserve,  in as  current  a  form  as is  reasonably
practicable,  the names and  addresses  of Holders  contained in the most recent
list  furnished  to the  Trustee as  provided  in Section  801 and the names and
addresses of Holders  received by the Trustee in its capacity as Note Registrar.
The Trustee may destroy any list furnished to it as provided in Section 801 upon
receipt of a new list so furnished.

      The rights of Holders to  communicate  with other  Holders with respect to
their rights  under this  Indenture  or under the Notes,  and the  corresponding
rights  and  privileges  of the  Trustee,  shall  be as  provided  by the  Trust
Indenture Act.

      Every Holder of Notes, by receiving and holding the same,  agrees with the
Company and the Trustee  that  neither the Company nor the Trustee nor any agent
of either of them  shall be held  accountable  by  reason of any  disclosure  of
information  as to names and  addresses  of Holders  made  pursuant to the Trust
Indenture Act.


SECTION 803.  Reports by Trustee.

      The Trustee shall transmit to Holders such reports  concerning the Trustee
and its actions  under this  Indenture as may be required  pursuant to the Trust
Indenture  Act at the times and in the  manner  provided  pursuant  thereto.  If
required by Section 313(a) of the Trust Indenture Act, the Trustee shall, within
sixty days after each May 15  following  the date of this  Indenture  deliver to
Holders  a brief  report,  dated  as of such  May 15,  which  complies  with the
provisions of such Section 313(a).
                                       50

      A copy of each such  report  shall,  at the time of such  transmission  to
Holders,  be filed by the Trustee with each stock  exchange upon which any Notes
are listed, with the Commission and with the Company.  The Company will promptly
notify the Trustee when any Notes are listed on any stock exchange.


SECTION 804.  Reports by Company.

      The Company shall file with the Trustee and the  Commission,  and transmit
to Holders,  such information,  documents and other reports,  and such summaries
thereof, as may be required pursuant to the Trust Indenture Act at the times and
in the manner provided pursuant to such Act; provided that any such information,
documents  or reports  required  to be filed  with the  Commission  pursuant  to
Section 13 or 15(d) of the Exchange  Act shall be filed with the Trustee  within
15 days after the same is so required to be filed with the Commission.


                                  ARTICLE NINE

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE


SECTION 901.  Company May Consolidate, Etc., Only on Certain Terms.

      The Company shall not  consolidate  with or merge into any other Person or
convey, transfer or lease its properties and assets substantially as an entirety
to any Person,  and the Company shall not permit any Person to consolidate  with
or merge into the Company or convey, transfer or lease its properties and assets
substantially as an entirety to the Company, unless:

         (1) in case the Company  shall  consolidate  with or merge into another
   Person or convey,  transfer or lease its properties and assets  substantially
   as an entirety to any Person, the Person formed by such consolidation or into
   which the Company is merged or the Person  which  acquires by  conveyance  or
   transfer,  or  which  leases,  the  properties  and  assets  of  the  Company
   substantially   as  an  entirety   shall  be  a   corporation,   partnership,
   unincorporated organization or trust, shall be organized and validly existing
   under the laws of the  United  States of  America,  any State  thereof or the
   District  of  Columbia  and  (a)  shall  expressly  assume,  by an  indenture
   supplemental  hereto,   executed  and  delivered  to  the  Trustee,  in  form
   satisfactory to the Trustee, the due and punctual payment of the principal of
   and any  premium  and  interest  on all the  Notes  and  the  performance  or
   observance of every  covenant of this Indenture on the part of the Company to
   be  performed  or observed  (b) if such  consolidation,  merger,  conveyance,
   transfer,  or lease occurs prior to the Release Date, shall expressly assume,
   by an indenture supplemental to the First Mortgage, executed and delivered to
   the Trustee and the Mortgage Trustee, in form satisfactory to the Trustee and
   the Mortgage  Trustee,  the due and punctual  payment of the principal of and
   any premium and interest on all of the Senior Note First  Mortgage  Bonds and
   the  performance  of every  covenant of the First Mortgage on the part of the
   Company to be performed or observed.  For purposes of this Article Nine,  the
   phrase "assets  substantially  as an entirety"  shall mean 50% or more of the
   total assets of the 
                                       51

   Company  as  shown  on  the  consolidated  balance sheet of the Company as of
   the end of the calendar  year  immediately  preceding  the day of the year in
   which such  determination is made and nothing in this Indenture shall prevent
   or hinder the Company  from  conveying,  transferring  or leasing  during any
   calendar year (in one transaction or a series of transactions)  less than 50%
   of the amount of its total assets as shown on the consolidated  balance sheet
   of the Company as of the end of the immediately preceding calendar year;

         (2)  immediately  after giving effect to such  transaction and treating
   any indebtedness which becomes an obligation of the Company or any Subsidiary
   as a result of such  transaction  as having  been  incurred by the Company or
   such Subsidiary at the time of such transaction,  no Event of Default, and no
   event which,  after notice or lapse of time or both, would become an Event of
   Default, shall have happened and be continuing;

         (3) if,  as a  result  of any  such  consolidation  or  merger  or such
   conveyance,  transfer or lease,  properties  or assets of the  Company  would
   become  subject to a  mortgage,  pledge,  lien,  security  interest  or other
   encumbrance  which would not be permitted by this  Indenture,  the Company or
   such successor  Person, as the case may be, shall take such steps as shall be
   necessary  effectively to secure the Notes equally and ratably with (or prior
   to) all indebtedness secured thereby; and

         (4) the Company has  delivered to the Trustee an Officers'  Certificate
   and an Opinion of Counsel,  each  stating  that such  consolidation,  merger,
   conveyance, transfer or lease and, if a supplemental indenture is required in
   connection with such  transaction,  such  supplemental  indenture comply with
   this Article and that all conditions  precedent  herein provided for relating
   to such transaction have been complied with.


SECTION 902.  Successor Substituted.

      Upon any consolidation of the Company with, or merger of the Company into,
any other  Person or any  conveyance,  transfer or lease of the  properties  and
assets of the Company  substantially  as an entirety in accordance  with Section
901, the successor Person formed by such consolidation or into which the Company
is merged or to which such  conveyance,  transfer or lease is made shall succeed
to, and be  substituted  for,  and may  exercise  every  right and power of, the
Company under this Indenture  with the same effect as if such  successor  Person
had been named as the Company herein,  and  thereafter,  except in the case of a
lease, the predecessor Person shall be relieved of all obligations and covenants
under this Indenture and the Notes.
                                       52

                                   ARTICLE TEN

                             SUPPLEMENTAL INDENTURES


SECTION 1001.  Supplemental Indentures Without Consent of Holders.

      Without the consent of any Holders,  the  Company,  when  authorized  by a
Board Resolution,  and the Trustee, at any time and from time to time, may enter
into one or more indentures  supplemental  hereto,  in form  satisfactory to the
Trustee, for any of the following purposes:

         (1) to evidence the succession of another Person to the Company and the
   assumption by any such  successor of the covenants of the Company  herein and
   in the Notes; or

         (2) to add to the  covenants  of the  Company  for the  benefit  of the
   Holders of all or any series of Notes  (and if such  covenants  are to be for
   the benefit of less than all series of Notes, stating that such covenants are
   expressly  being  included  solely  for the  benefit  of such  series)  or to
   surrender any right or power herein conferred upon the Company; or

         (3) to add any  additional  Events of  Default  for the  benefit of the
   Holders  of all or any  series  of Notes  (and if such  additional  Events of
   Default are to be for the  benefit of less than all series of Notes,  stating
   that such  additional  Events of Default are expressly  being included solely
   for the benefit of such series); or

         (4) to add to or change any of the provisions of this Indenture to such
   extent as shall be necessary to permit or facilitate the issuance of Notes in
   bearer form,  registrable  or not  registrable  as to principal,  and with or
   without interest coupons, or to permit or facilitate the issuance of Notes in
   uncertificated form; or

         (5) to add  to,  change  or  eliminate  any of the  provisions  of this
   Indenture in respect of one or more series of Notes,  provided  that any such
   addition,  change or  elimination  (A) shall neither (i) apply to any Note of
   any series created prior to the execution of such supplemental  indenture and
   entitled to the benefit of such  provision  nor (ii) modify the rights of the
   Holder of any such Note with  respect to such  provision  or (B) shall become
   effective only when there is no such Note Outstanding; or

         (6) to secure the Notes; or

         (7) to establish  the form or terms of Notes of any series as permitted
   by Sections 201 and 301; or

         (8) to evidence and provide for the acceptance of appointment hereunder
   by a successor Trustee with respect to the Notes of one or more series and to
   add to or  change  any of the  provisions  of  this  Indenture  as  shall  be
   necessary  to provide  for or  facilitate  the  administration  of the trusts
   hereunder by more than one Trustee,  pursuant to the  requirements of Section
   711; or
                                       53

         (9) to cure any  ambiguity,  to correct  or  supplement  any  provision
   herein  which may be  defective  or  inconsistent  with any  other  provision
   herein,  or to make any other provisions with respect to matters or questions
   arising  under this  Indenture,  provided  that such action  pursuant to this
   Clause (9) shall not  adversely  affect the interests of the Holders of Notes
   of any series in any material respect.


SECTION 1002.  Supplemental Indentures With Consent of Holders.

      With the consent of the Holders of a majority in  principal  amount of the
Outstanding Notes of each series affected by such supplemental indenture, by Act
of said  Holders  delivered to the Company and the  Trustee,  the Company,  when
authorized by a Board Resolution, and the Trustee may enter into an indenture or
indentures  supplemental  hereto for the purpose of adding any  provisions to or
changing in any manner or eliminating any of the provisions of this Indenture or
of  modifying  in any manner the rights of the  Holders of Notes of such  series
under this Indenture;  provided,  however,  that no such supplemental  indenture
shall,  without  the  consent of the Holder of each  Outstanding  Note  affected
thereby,

         (1) change the Stated  Maturity of the principal of, or any  instalment
   of  principal  of or interest on, any Note,  or reduce the  principal  amount
   thereof or the rate of  interest  thereon  or any  premium  payable  upon the
   redemption  thereof,  or reduce the amount of the  principal  of an  Original
   Issue  Discount  Note or any other Note which would be due and payable upon a
   declaration of acceleration of the Maturity  thereof pursuant to Section 602,
   or change any Place of Payment where,  or the coin or currency in which,  any
   Note or any premium or interest  thereon is payable,  or impair the  interest
   hereunder of the Trustee in the Senior Note First Mortgage  Bonds,  or impair
   the right to  institute  suit for the  enforcement  of any such payment on or
   after the Stated Maturity thereof (or, in the case of redemption, on or after
   the  Redemption  Date),  or prior to the Release  Date,  impair the  interest
   hereunder of the Trustee in the Senior Note First Mortgage Bonds,  reduce the
   principal  amount of any  series of Senior  Note First  Mortgage  Bonds to an
   amount less than the principal amount of the related series of Notes or alter
   the payment  provisions of such Senior Note First  Mortgage Bonds in a manner
   adverse to the Holders of the Notes, or

         (2) reduce the percentage in principal amount of the Outstanding  Notes
   of any  series,  the  consent  of  whose  Holders  is  required  for any such
   supplemental  indenture,  or the consent of whose Holders is required for any
   waiver (of  compliance  with certain  provisions of this Indenture or certain
   defaults hereunder and their consequences) provided for in this Indenture, or

         (3)  modify  any of the  provisions  of this  Section,  Section  613 or
   Section  1108,  except to increase  any such  percentage  or to provide  that
   certain  other  provisions  of this  Indenture  cannot be  modified or waived
   without the consent of the Holder of each Outstanding Note affected  thereby;
   provided,  however,  that this  clause  shall not be  deemed to  require  the
   consent of any Holder  with  respect  to  changes in the  references  to "the
   Trustee" and  concomitant  changes in this Section and Section  1108,  or the
   deletion of this proviso, in accordance with the requirements of Sections 711
   and 1001(8).
                                       54

A  supplemental  indenture  which  changes or  eliminates  any covenant or other
provision of this  Indenture  which has expressly  been included  solely for the
benefit of one or more particular  series of Notes, or which modifies the rights
of the Holders of Notes of such series  with  respect to such  covenant or other
provision,  shall be deemed not to affect the rights under this Indenture of the
Holders of Notes of any other series.

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


SECTION 1003.  Execution of Supplemental Indentures.

      In  executing,   or  accepting  the  additional  trusts  created  by,  any
supplemental indenture permitted by this Article or the modifications thereby of
the trusts created by this Indenture,  the Trustee shall be entitled to receive,
and  (subject  to Section  701) shall be fully  protected  in relying  upon,  an
Opinion of Counsel stating that the execution of such supplemental  indenture is
authorized  or  permitted by this  Indenture.  The Trustee may, but shall not be
obligated  to,  enter into any such  supplemental  indenture  which  affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.


SECTION 1004.  Effect of Supplemental Indentures.

      Upon the execution of any supplemental  indenture under this Article, this
Indenture  shall be  modified in  accordance  therewith,  and such  supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Notes theretofore or thereafter  authenticated and delivered  hereunder shall
be bound thereby.


SECTION 1005.  Conformity with Trust Indenture Act.

      Every  supplemental  indenture  executed  pursuant to this  Article  shall
conform to the requirements of the Trust Indenture Act.


SECTION 1006.  Reference in Notes to Supplemental Indentures.

      Notes of any series authenticated and delivered after the execution of any
supplemental  indenture  pursuant to this  Article may, and shall if required by
the  Trustee,  bear a notation in form  approved by the Trustee as to any matter
provided for in such supplemental  indenture. If the Company shall so determine,
new Notes of any series so modified as to conform, in the opinion of the Trustee
and the Company, to any such supplemental indenture may be prepared and executed
by the Company and  authenticated  and  delivered by the Trustee in exchange for
Outstanding Notes of such series.
                                       55

                                 ARTICLE ELEVEN

                                    COVENANTS


SECTION 1101.  Payment of Principal, Premium and Interest.

      The Company  covenants  and agrees for the benefit of each series of Notes
that it will  duly and  punctually  pay the  principal  of and any  premium  and
interest on the Notes of that series in  accordance  with the terms of the Notes
and this Indenture.


SECTION 1102.  Maintenance of Office or Agency.

      The Company will maintain in each Place of Payment for any series of Notes
an office or agency where Notes of that series may be  presented or  surrendered
for payment,  where Notes of that series may be surrendered for  registration of
transfer  or  exchange  and where  notices and demands to or upon the Company in
respect  of the Notes of that  series  and this  Indenture  may be  served.  The
Company will give prompt written notice to the Trustee of the location,  and any
change in the  location,  of such  office or agency.  If at any time the Company
shall  fail to  maintain  any such  required  office or agency or shall  fail to
furnish the Trustee with the address thereof,  such  presentations,  surrenders,
notices and demands may be made or served at the  Corporate  Trust Office of the
Trustee, and the Company hereby appoints the Trustee as its agent to receive all
such presentations, surrenders, notices and demands.

      The Company may also from time to time designate one or more other offices
or  agencies  where  the  Notes  of one or  more  series  may  be  presented  or
surrendered  for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall in
any manner relieve the Company of its obligation to maintain an office or agency
in each Place of Payment for Notes of any series for such purposes.  The Company
will give  prompt  written  notice to the  Trustee  of any such  designation  or
rescission and of any change in the location of any such other office or agency.


SECTION 1103.  Money for Notes Payments to Be Held in Trust.

      If the Company  shall at any time act as its own Paying Agent with respect
to any series of Notes,  it will, on or before each due date of the principal of
or any  premium or interest on any of the Notes of that  series,  segregate  and
hold in trust for the benefit of the Persons  entitled  thereto a sum sufficient
to pay the  principal  and any premium and  interest so becoming  due until such
sums shall be paid to such Persons or otherwise  disposed of as herein  provided
and will promptly notify the Trustee of its action or failure so to act.

      Whenever the Company  shall have one or more Paying  Agents for any series
of Notes, it will,  prior to each due date of the principal of or any premium or
interest  on any  Notes  of  that  series,  deposit  with a  Paying  Agent a sum
sufficient to pay such amount, such sum
                                       56

to be held as provided by the Trust Indenture Act, and (unless such Paying Agent
is the Trustee) the Company  will  promptly  notify the Trustee of its action or
failure so to act.

      The  Company  will cause each  Paying  Agent for any series of Notes other
than the Trustee to execute and  deliver to the Trustee an  instrument  in which
such Paying Agent shall agree with the  Trustee,  subject to the  provisions  of
this Section,  that such Paying Agent will (1) comply with the provisions of the
Trust  Indenture  Act  applicable  to it as a Paying  Agent and (2)  during  the
continuance  of any default by the Company (or any other  obligor upon the Notes
of that  series)  in the  making of any  payment in respect of the Notes of that
series,  upon the written  request of the Trustee,  forthwith pay to the Trustee
all sums held in trust by such Paying  Agent for payment in respect of the Notes
of that series.

      The Company may at any time, for the purpose of obtaining the satisfaction
and  discharge of this  Indenture or for any other  purpose,  pay, or by Company
Order  direct any Paying  Agent to pay, to the Trustee all sums held in trust by
the Company or such Paying  Agent,  such sums to be held by the Trustee upon the
same  trusts as those  upon  which  such sums were held by the  Company  or such
Paying Agent;  and,  upon such payment by any Paying Agent to the Trustee,  such
Paying Agent shall be released from all further  liability  with respect to such
money.

      Any money  deposited with the Trustee or any Paying Agent, or then held by
the  Company,  in trust for the  payment of the  principal  of or any premium or
interest on any Note of any series and  remaining  unclaimed for two years after
such principal,  premium or interest has become due and payable shall be paid to
the  Company  on  Company  Request,  or (if then held by the  Company)  shall be
discharged from such trust; and the Holder of such Note shall thereafter,  as an
unsecured  general creditor,  look only to the Company for payment thereof,  and
all  liability  of the Trustee or such Paying  Agent with  respect to such trust
money,  and all  liability of the Company as trustee  thereof,  shall  thereupon
cease;  provided,  however,  that the Trustee or such Paying Agent, before being
required to make any such repayment,  may at the expense of the Company cause to
be published once, in a newspaper published in the English language, customarily
published  on each  Business  Day and of general  circulation  in the Borough of
Manhattan,  The City of New York,  New York,  notice  that  such  money  remains
unclaimed and that, after a date specified therein, which shall not be less than
30 days from the date of such  publication,  any unclaimed balance of such money
then remaining will be repaid to the Company.


SECTION 1104.  Statement by Officers as to Default.

      The Company will deliver to the Trustee,  within 120 days after the end of
each fiscal year of the  Company  ending  after the date  hereof,  an  Officers'
Certificate, stating whether or not to the best knowledge of the signers thereof
the Company is in default in the performance and observance of any of the terms,
provisions  and conditions of this  Indenture  (without  regard to any period of
grace or requirement of notice provided  hereunder) and, if the Company shall be
in default,  specifying  all such defaults and the nature and status  thereof of
which they may have knowledge.
                                       57

SECTION 1105.  Recording, Filing, etc.; Opinions of Counsel.

      The Company will cause this Indenture, any indentures supplemental to this
Indenture,  and any financing or continuation statements to be promptly recorded
and filed and rerecorded and refiled in such a manner and in such places, as may
be required by law in order fully to preserve,  protect and perfect the security
of the Holders and all rights of the Trustee, and shall deliver to the Trustee:

    (a) promptly  after the execution and delivery of this  Indenture and of any
indenture  supplemental  to this  Indenture  but prior to the Release  Date,  an
Opinion of Counsel  either  stating that,  in the opinion of such counsel,  this
Indenture or such  supplemental  indenture  and any  financing  or  continuation
statements have been properly  recorded and filed so as to make effective and to
perfect the  security  interest  of the  Trustee  intended to be created by this
Indenture  for the benefit of the  Holders  from time to time in the Senior Note
First Mortgage Bonds, and reciting the details of such action,  or stating that,
in the opinion of such  counsel,  no such action is necessary to perfect or make
such  security  interest  effective  and  stating  what,  if any,  action of the
foregoing  character may reasonably be expected to become necessary prior to the
next succeeding November 1 to maintain,  perfect and make such security interest
effective; and

           (b) on or before  November 1 of each  year,  beginning  in 1997,  and
prior to the Release  Date,  an Opinion of Counsel  either  stating  that in the
opinion of such counsel  such action has been taken,  since the date of the most
recent  Opinion of Counsel  furnished  pursuant to this  Section  1105(b) or the
first Opinion of Counsel furnished pursuant to Section 1105(a),  with respect to
the  recording,  filing,  rerecording,  or  refiling  of  this  Indenture,  each
supplemental  indenture  and any  financing or  continuation  statements,  as is
necessary to maintain and perfect the security  interest of the Trustee intended
to be created by this Indenture for the benefit of the Holders from time to time
of the Notes in the Senior Note First Mortgage  Bonds,  and reciting the details
of such action, or stating that in the opinion of such counsel no such action is
necessary to maintain and perfect such  security  interest and stating  what, if
any,  action of the  foregoing  character  may  reasonably be expected to become
necessary prior to the next succeeding November 1 to maintain,  perfect and make
such security interest effective.


SECTION 1106.  Existence.

      Subject  to  Article  Nine,  the  Company  will do or cause to be done all
things  necessary to preserve  and keep in full force and effect its  existence,
rights (charter and statutory) and corporate franchises; provided, however, that
the Company shall not be required to preserve any such right or franchise if the
Board of Directors  shall determine that the  preservation  thereof is no longer
desirable  in the  conduct  of the  business  of the  Company  and that the loss
thereof is not disadvantageous in any material respect to the Holders.
                                       58

SECTION 1107.  Maintenance of Properties.

      Subject to Article  Nine,  the Company will cause all  properties  used or
useful in the conduct of its  business or the business of any  Subsidiary  to be
maintained  and kept in good  condition,  repair and working  order and supplied
with all necessary  equipment  and will cause to be made all necessary  repairs,
renewals,  replacements,  betterments and  improvements  thereof,  all as in the
judgment of the  Company may be  necessary  so that the  business  carried on in
connection therewith may be properly and advantageously  conducted at all times;
provided,  however,  that nothing in this Section shall prevent the Company from
discontinuing  the operation or  maintenance  of any of such  properties if such
discontinuance  is, in the judgment of the Company,  desirable in the conduct of
its business or the business of any  Subsidiary and not  disadvantageous  in any
material respect to the Holders.


SECTION 1108.  Payment of Taxes and Other Claims.

      The  Company  will pay or  discharge  or  cause to be paid or  discharged,
before  the  same  shall  become  delinquent,  (1) all  taxes,  assessments  and
governmental  charges  levied or imposed upon the Company or any  Subsidiary  or
upon the income,  profits or property of the Company or any Subsidiary,  and (2)
all lawful claims for labor,  materials and supplies which, if unpaid,  might by
law become a lien upon the property of the Company or any Subsidiary;  provided,
however,  that the Company shall not be required to pay or discharge or cause to
be paid or discharged  any such tax,  assessment,  charge or claim whose amount,
applicability  or  validity  is being  contested  in good  faith by  appropriate
proceedings.


SECTION 1109.  Waiver of Certain Covenants.

      Except as otherwise  specified as contemplated by Section 301 for Notes of
such series,  the Company may, with respect to the Notes of any series,  omit in
any  particular  instance to comply with any term,  provision or  condition  set
forth in any covenant provided  pursuant to Section 301(20),  1001(2) or 1001(7)
for the benefit of the Holders of such series or in any of Sections 1107 through
1108 if  before  the time for such  compliance  the  Holders  of a  majority  in
principal  amount of the Outstanding  Notes of such series shall, by Act of such
Holders,  either  waive such  compliance  in such  instance or  generally  waive
compliance  with such term,  provision  or  condition,  but no such waiver shall
extend to or affect such term,  provision or  condition  except to the extent so
expressly waived, and, until such waiver shall become effective, the obligations
of the  Company  and the  duties of the  Trustee  in  respect  of any such term,
provision or condition shall remain in full force and effect.


SECTION 1110.  Calculation of Original Issue Discount.

   The Company shall file with the Trustee  promptly at the end of each calendar
year  a  written  notice  specifying  the  amount  of  original  issue  discount
(including daily rates and accrual  periods) accrued on Outstanding  Notes as of
the end of such year.
                                       59

                                 ARTICLE TWELVE

                               REDEMPTION OF NOTES


SECTION 1201.  Applicability of Article.

      Notes of any series which are  redeemable  before  their  Stated  Maturity
shall be  redeemable  in  accordance  with their terms and (except as  otherwise
specified as contemplated by Section 301 for such Notes) in accordance with this
Article.


SECTION 1202.  Election to Redeem; Notice to Trustee.

      The  election of the Company to redeem any Notes shall be  evidenced  by a
Board  Resolution or in another manner  specified as contemplated by Section 301
for such Notes.  In case of any  redemption at the election of the Company,  the
Company  shall,  at least  60 days  prior to the  Redemption  Date  fixed by the
Company (unless a shorter notice shall be  satisfactory to the Trustee),  notify
the Trustee of such  Redemption  Date, of the principal  amount of Notes of such
series  to be  redeemed  and,  if  applicable,  of the  tenor of the Notes to be
redeemed.  In the case of any redemption of Notes (a) prior to the expiration of
any  restriction  on such  redemption  provided  in the  terms of such  Notes or
elsewhere in this Indenture, or (b) pursuant to an election of the Company which
is subject to a condition  specified  in the terms of such Notes or elsewhere in
this  Indenture,  the  Company  shall  furnish  the  Trustee  with an  Officers'
Certificate evidencing compliance with such restriction or condition.


SECTION 1203.  Selection by Trustee of Notes to Be Redeemed.

      If less than all the Notes of any series are to be  redeemed  (unless  all
the Notes of such series and of a  specified  tenor are to be redeemed or unless
such redemption affects only a single Note), the particular Notes to be redeemed
shall be  selected  not more than 60 days  prior to the  Redemption  Date by the
Trustee,  from the  Outstanding  Notes of such series not previously  called for
redemption,  by such method as the Trustee shall deem fair and  appropriate  and
which may provide for the selection for redemption of a portion of the principal
amount of any Note of such series,  provided that the unredeemed  portion of the
principal amount of any Note shall be in an authorized denomination (which shall
not be less than the minimum  authorized  denomination)  for such Note.  If less
than all the Notes of such  series and of a  specified  tenor are to be redeemed
(unless such redemption  affects only a single Note), the particular Notes to be
redeemed shall be selected not more than 60 days prior to the Redemption Date by
the Trustee,  from the Outstanding  Notes of such series and specified tenor not
previously called for redemption in accordance with the preceding sentence.

      The  Trustee  shall  promptly  notify the  Company in writing of the Notes
selected  for  redemption  as aforesaid  and, in case of any Notes  selected for
partial redemption as aforesaid, the principal amount thereof to be redeemed.
                                       60


      The  provisions  of the two  preceding  paragraphs  shall not  apply  with
respect to any redemption  affecting only a single Note, whether such Note is to
be redeemed in whole or in part. In the case of any such redemption in part, the
unredeemed portion of the principal amount of the Note shall be in an authorized
denomination (which shall not be less than the minimum authorized  denomination)
for such Note.

      For all purposes of this Indenture, unless the context otherwise requires,
all provisions  relating to the redemption of Notes shall relate, in the case of
any  Notes  redeemed  or to be  redeemed  only in part,  to the  portion  of the
principal amount of such Notes which has been or is to be redeemed.


SECTION 1204.  Notice of Redemption.

      Notice of redemption shall be given by first-class mail,  postage prepaid,
mailed not less than 30 nor more than 60 days prior to the  Redemption  Date, to
each  Holder  of Notes to be  redeemed,  at his  address  appearing  in the Note
Register.

      All  notices  of  redemption  shall  identify  the  Notes  to be  redeemed
(including CUSIP number) and shall state:

      (1) the Redemption Date,

      (2) the Redemption Price,

      (3) if  less  than  all  the  Outstanding  Notes  of any  series  and of a
   specified tenor consisting of more than a single Note are to be redeemed, the
   identification (and, in the case of partial redemption of any such Notes, the
   principal  amounts) of the particular  Notes to be redeemed and, if less than
   all the Outstanding  Notes of any series and of a specified tenor  consisting
   of a single Note are to be redeemed,  the principal  amount of the particular
   Note to be redeemed,

      (4) that on the Redemption  Date the Redemption  Price will become due and
   payable upon each such Note to be redeemed and, if applicable,  that interest
   thereon will cease to accrue on and after said date,

      (5) the place or places  where  each  such Note is to be  surrendered  for
   payment of the Redemption Price, and

      (6) that the redemption is for a sinking fund, if such is the case.

      Notice  of  redemption  of Notes to be  redeemed  at the  election  of the
   Company  shall be given by the Company or, at the Company's  request,  by the
   Trustee  in  the  name  and at  the  expense  of the  Company  and  shall  be
   irrevocable.
                                       61

SECTION 1205.  Deposit of Redemption Price.

      Prior to any  Redemption  Date, the Company shall deposit with the Trustee
or with a Paying  Agent (or, if the  Company is acting as its own Paying  Agent,
segregate  and hold in trust as  provided  in  Section  1103) an amount of money
sufficient to pay the Redemption  Price of, and (except if the  Redemption  Date
shall be an Interest  Payment Date) accrued interest on, all the Notes which are
to be redeemed on that date.


SECTION 1206.  Notes Payable on Redemption Date.

      Notice of redemption  having been given as  aforesaid,  the Notes so to be
redeemed shall, on the Redemption Date, become due and payable at the Redemption
Price therein specified,  and from and after such date (unless the Company shall
default in the payment of the Redemption Price and accrued  interest) such Notes
shall cease to bear interest.  Upon surrender of any such Note for redemption in
accordance  with said  notice,  such Note  shall be paid by the  Company  at the
Redemption  Price,  together  with  accrued  interest  to the  Redemption  Date;
provided,  however,  that, unless otherwise specified as contemplated by Section
301,  installments  of  interest  whose  Stated  Maturity  is on or prior to the
Redemption  Date will be payable to the  Holders of such  Notes,  or one or more
Predecessor  Notes,  registered as such at the close of business on the relevant
Record Dates according to their terms and the provisions of Section 307.

      If any Note  called  for  redemption  shall not be so paid upon  surrender
thereof for  redemption,  the principal and any premium shall,  until paid, bear
interest from the Redemption Date at the rate prescribed therefor in the Note.


SECTION 1207.  Notes Redeemed in Part.

      Any Note which is to be redeemed  only in part shall be  surrendered  at a
Place of Payment therefor (with, if the Company or the Trustee so requires,  due
endorsement by, or a written  instrument of transfer in form satisfactory to the
Company and the Trustee  duly  executed  by, the Holder  thereof or his attorney
duly  authorized  in writing),  and the Company shall  execute,  and the Trustee
shall  authenticate  and  deliver  to the  Holder of such Note  without  service
charge,  a new  Note or  Notes  of the same  series  and of like  tenor,  of any
authorized  denomination  as requested by such  Holder,  in aggregate  principal
amount equal to and in exchange for the  unredeemed  portion of the principal of
the Note so surrendered.
                                       62

                                ARTICLE THIRTEEN

                                  SINKING FUNDS


SECTION 1301.  Applicability of Article.

      The provisions of this Article shall be applicable to any sinking fund for
the  retirement  of  Notes  of any  series  except  as  otherwise  specified  as
contemplated by Section 301 for such Notes.

      The minimum  amount of any sinking fund payment  provided for by the terms
of any Notes is herein  referred to as a "mandatory  sinking fund payment",  and
any payment in excess of such minimum  amount  provided for by the terms of such
Notes is herein referred to as an "optional  sinking fund payment".  If provided
for by the terms of any Notes,  the cash amount of any sinking  fund payment may
be subject to reduction as provided in Section  1302.  Each sinking fund payment
shall be applied to the redemption of Notes as provided for by the terms of such
Notes.


SECTION 1302.  Satisfaction of Sinking Fund Payments with Notes.

      The Company (1) may deliver  Outstanding Notes of a series (other than any
previously  called  for  redemption)  and (2) may  apply as a credit  Notes of a
series which have been redeemed  either at the election of the Company  pursuant
to the terms of such Notes or through  the  application  of  permitted  optional
sinking  fund  payments  pursuant  to the terms of such  Notes,  in each case in
satisfaction  of all or any part of any sinking fund payment with respect to any
Notes of such series  required to be made pursuant to the terms of such Notes as
and to the extent  provided  for by the terms of such Notes;  provided  that the
Notes to be so credited have not been previously so credited. The Notes to be so
credited  shall be received  and credited for such purpose by the Trustee at the
Redemption  Price,  as specified in the Notes so to be redeemed,  for redemption
through  operation  of the  sinking  fund and the  amount of such  sinking  fund
payment shall be reduced accordingly.


SECTION 1303.  Redemption of Notes for Sinking Fund.

      Not less than 60 days  prior to each  sinking  fund  payment  date for any
Notes,  the  Company  will  deliver  to the  Trustee  an  Officers'  Certificate
specifying  the amount of the next  ensuing  sinking fund payment for such Notes
pursuant to the terms of such Notes, the portion thereof, if any, which is to be
satisfied  by payment of cash and the portion  thereof,  if any,  which is to be
satisfied by delivering and crediting Notes pursuant to Section 1302 and stating
the basis  for such  credit  and that such  Notes  have not been  previously  so
credited and will also deliver to the Trustee any Notes to be so delivered.  Not
less than 30 days prior to each such  sinking  fund  payment  date,  the Trustee
shall select the Notes to be redeemed upon such sinking fund payment date in the
manner  specified in Section 1203 and cause notice of the redemption  thereof to
be given in the name of and at the expense of the Company in the manner provided
in Section 1204. Such notice having been duly given, the
                                       63

redemption  of such Notes shall be made upon the terms and in the manner  stated
in Sections 1206 and 1207.


                                ARTICLE FOURTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE


SECTION 1401.  Company's Option to Effect Defeasance or Covenant Defeasance.

      The Company may elect,  at its option at any time, to have Section 1402 or
Section  1403  applied to any Notes or any series of Notes,  as the case may be,
designated  pursuant to Section 301 as being defeasible pursuant to such Section
1402 or 1403, in accordance with any applicable  requirements  provided pursuant
to Section 301 and upon  compliance  with the conditions set forth below in this
Article.  Any such  election  shall be  evidenced  by a Board  Resolution  or in
another manner specified as contemplated by Section 301 for such Notes.


SECTION 1402.  Defeasance and Discharge.

      Upon the  Company's  exercise of its option (if any) to have this  Section
applied  to any Notes or any series of Notes,  as the case may be,  the  Company
shall be deemed to have been  discharged  from its  obligations  with respect to
such Notes as provided in this Section on and after the date the  conditions set
forth in Section 1404 are satisfied  (hereinafter  called  "Defeasance") and the
obligation  of the Company to make payment with respect to the  principal of and
premium,  if may, and interest on the Senior Notes First Mortgage Bonds shall be
satisfied and  discharged,  as provided in the  supplemental  trust indenture or
indentures to the First Mortgage  creating such Senior Note First Mortgage Bonds
and the Senior Note First  Mortgage Bonds shall cease to secure the Notes in any
manner. For this purpose, such Defeasance means that the Company shall be deemed
to have paid and  discharged the entire  indebtedness  represented by such Notes
and to have  satisfied  all its  other  obligations  under  such  Notes and this
Indenture  insofar as such Notes are concerned (and the Trustee,  at the expense
of the  Company,  shall  execute  proper  instruments  acknowledging  the same),
subject to the  following  which shall  survive  until  otherwise  terminated or
discharged hereunder: (1) the rights of Holders of such Notes to receive, solely
from the trust fund  described  in  Section  1404 and as more fully set forth in
such  Section,  payments  in respect of the  principal  of and any  premium  and
interest on such Notes when payments are due, (2) the Company's obligations with
respect to such Notes  under  Sections  304,  305,  306,  1102 and 1103 and with
respect to the Trustee under Section 707, (3) the rights, powers, trusts, duties
and  immunities  of the  Trustee  hereunder  and (4) this  Article.  Subject  to
compliance  with this  Article,  the Company may exercise its option (if any) to
have this Section applied to any Notes notwithstanding the prior exercise of its
option (if any) to have Section 1403 applied to such Notes. 
                                       64

SECTION 1403.  Covenant Defeasance.

      Upon the  Company's  exercise of its option (if any) to have this  Section
applied to any Notes or any series of Notes, as the case may be, (1) the Company
shall be released  from its  obligations  under  Section  901(3),  Sections 1107
through 1108, inclusive, and any covenants provided pursuant to Section 301(20),
1001(2),  1001(6) or 1001(7)  and 601(8) for the  benefit of the Holders of such
Notes and (2) the  occurrence  of any event  specified in Sections  601(4) (with
respect to any of Section 901(3), Sections 1107 through 1108, inclusive, and any
such  covenants  provided  pursuant  to  Section  301(20),  1001(2),  1001(6) or
1001(7))  and 601(8)  shall be deemed not to be or result in an Event of Default
with respect to such Notes as provided in this Section on and after the date the
conditions set forth in Section 1404 are satisfied (hereinafter called "Covenant
Defeasance").  For this  purpose,  such  Covenant  Defeasance  means that,  with
respect to such  Notes,  the  Company  may omit to comply with and shall have no
liability in respect of any term,  condition or limitation set forth in any such
specified  Section (to the extent so specified  in the case of Section  601(4)),
whether  directly or indirectly by reason of any reference  elsewhere  herein to
any such Section or by reason of any  reference in any such Section to any other
provision  herein or in any other document,  but the remainder of this Indenture
and such Notes shall be unaffected thereby.


SECTION 1404.  Conditions to Defeasance or Covenant Defeasance.

      The following  shall be the conditions to the  application of Section 1402
or Section 1403 to any Notes or any series of Notes, as the case may be:

         (1) The  Company  shall  irrevocably  have  deposited  or  caused to be
   deposited  with the Trustee as trust funds in trust for the purpose of making
   the following payments,  specifically  pledged as security for, and dedicated
   solely to, the benefit of the Holders of such Notes,  (A) money in an amount,
   or (B) U.S.  Government  Obligations  which through the scheduled  payment of
   principal and interest in respect thereof in accordance with their terms will
   provide, not later than one day before the due date of any payment,  money in
   an amount,  or (C) a combination  thereof,  in each case  sufficient,  in the
   opinion of a nationally  recognized  firm of independent  public  accountants
   expressed in a written certification thereof delivered to the Trustee, to pay
   and  discharge,  and  which  shall  be  applied  by the  Trustee  to pay  and
   discharge, the principal of and any premium and interest on such Notes on the
   respective Stated  Maturities or on any Redemption Date established  pursuant
   to clause (9) below,  in accordance with the terms of this Indenture and such
   Notes. As used herein,  "U.S.  Government  Obligation" means (x) any security
   which is (i) a direct  obligation  of the United  States of  America  for the
   payment of which the full faith and credit of the United States of America is
   pledged or (ii) an  obligation  of a Person  controlled  or supervised by and
   acting as an agency or  instrumentality  of the United  States of America the
   payment  of which is  unconditionally  guaranteed  as a full faith and credit
   obligation  by the United  States of  America,  which,  in either case (i) or
   (ii), is not callable or redeemable at the option of the issuer thereof,  and
   (y) any depositary receipt issued by a bank (as defined in Section 3(a)(2) of
   the Notes Act) as custodian  with respect to any U.S.  Government  Obligation
   which is  specified in Clause (x) above and held by such bank for the account
   of the holder of such  depositary  receipt,  or with  respect to any specific
   payment of principal of or interest on any U.S.
                                       65

   Government   Obligation   which  is  so  specified   and held,  provided that
   (except as  required by law) such  custodian  is not  authorized  to make any
   deduction  from the amount payable to the holder of such  depositary  receipt
   from any amount  received by the custodian in respect of the U.S.  Government
   Obligation or the specific payment of principal or interest evidenced by such
   depositary receipt.

         (2) In the event of an election to have Section 1402 apply to any Notes
   or any series of Notes,  as the case may be, the Company shall have delivered
   to the  Trustee  an  Opinion  of Counsel  stating  that (A) the  Company  has
   received from, or there has been published by, the Internal Revenue Service a
   ruling or (B) since the date of this  instrument,  there has been a change in
   the  applicable  Federal  income  tax law,  in either  case (A) or (B) to the
   effect that,  and based thereon such opinion shall confirm that,  the Holders
   of such Notes will not recognize gain or loss for Federal income tax purposes
   as a result of the deposit,  Defeasance  and  discharge  to be effected  with
   respect to such  Notes and will be subject to Federal  income tax on the same
   amount, in the same manner and at the same times as would be the case if such
   deposit, Defeasance and discharge were not to occur.

         (3) In the event of an election to have Section 1403 apply to any Notes
   or any series of Notes,  as the case may be, the Company shall have delivered
   to the  Trustee an Opinion of Counsel to the effect  that the Holders of such
   Notes will not  recognize  gain or loss for Federal  income tax purposes as a
   result of the deposit and Covenant  Defeasance to be effected with respect to
   such Notes and will be subject to Federal  income tax on the same amount,  in
   the same  manner and at the same  times as would be the case if such  deposit
   and Covenant Defeasance were not to occur.

         (4) The  Company  shall have  delivered  to the  Trustee  an  Officers'
   Certificate  to the effect that neither such Notes nor any other Notes of the
   same series, if then listed on any securities exchange, will be delisted as a
   result of such deposit.

         (5) No event  which is, or after  notice or lapse of time or both would
   become,  an Event of Default  with  respect to such Notes or any other  Notes
   shall have  occurred and be  continuing  at the time of such deposit or, with
   regard to any such event specified in Sections 601(6) and (7), at any time on
   or prior to the 90th day after the date of such deposit (it being  understood
   that this condition shall not be deemed satisfied until after such 90th day).

         (6) Such Defeasance or Covenant  Defeasance shall not cause the Trustee
   to have a conflicting  interest within the meaning of the Trust Indenture Act
   (assuming all Notes are in default within the meaning of such Act).

         (7) Such Defeasance or Covenant Defeasance shall not result in a breach
   or  violation  of, or  constitute  a default  under,  any other  agreement or
   instrument to which the Company is a party or by which it is bound.

         (8) Such  Defeasance  or  Covenant  Defeasance  shall not result in the
   trust arising from such deposit constituting an investment company within the
   meaning of the  Investment  Company Act unless such trust shall be registered
   under such Act or exempt from registration thereunder.
                                       66

         (9) If the Notes are to be  redeemed  prior to Stated  Maturity  (other
   than from mandatory sinking fund payments or analogous  payments),  notice of
   such  redemption  shall have been duly given  pursuant to this  Indenture  or
   provision therefor satisfactory to the Trustee shall have been made.

         (10) The  Company  shall have  delivered  to the  Trustee an  Officers'
   Certificate  and an Opinion of  Counsel,  each  stating  that all  conditions
   precedent with respect to such  Defeasance or Covenant  Defeasance  have been
   complied with.


SECTION 1405.  Deposited Money and U.S. Government Obligations to Be
   Held in Trust; Miscellaneous Provisions.

      Subject to the provisions of the last paragraph of Section 1103, all money
and U.S. Government  Obligations (including the proceeds thereof) deposited with
the Trustee  pursuant  to Section  1404 in respect of any Notes shall be held in
trust and applied by the Trustee,  in  accordance  with the  provisions  of such
Notes and this  Indenture,  to the payment,  either directly or through any such
Paying  Agent  (including  the  Company  acting as its own Paying  Agent) as the
Trustee may  determine,  to the  Holders of such  Notes,  of all sums due and to
become due thereon in respect of  principal  and any premium and  interest,  but
money so held in trust need not be  segregated  from other  funds  except to the
extent required by law.

      The Company shall pay and  indemnify  the Trustee  against any tax, fee or
other  charge  imposed on or assessed  against the U.S.  Government  Obligations
deposited  pursuant to Section 1404 or the  principal  and interest  received in
respect thereof other than any such tax, fee or other charge which by law is for
the account of the Holders of Outstanding Notes.

      Anything  in this  Article to the  contrary  notwithstanding,  the Trustee
shall  deliver or pay to the Company from time to time upon Company  Request any
money or U.S. Government Obligations held by it as provided in Section 1404 with
respect to any Notes which,  in the opinion of a nationally  recognized  firm of
independent  public  accountants  expressed in a written  certification  thereof
delivered to the Trustee,  are in excess of the amount  thereof which would then
be required to be deposited to effect the Defeasance or Covenant Defeasance,  as
the case may be, with respect to such Notes.


SECTION 1406.  Reinstatement.

      If the  Trustee  or the  Paying  Agent is  unable  to apply  any  money in
accordance with this Article with respect to any Notes by reason of any order or
judgment  of any  court or  governmental  authority  enjoining,  restraining  or
otherwise  prohibiting  such  application,   then  the  obligations  under  this
Indenture and such Notes from which the Company has been  discharged or released
pursuant to Section  1402 or 1403 shall be revived and  reinstated  as though no
deposit had occurred pursuant to this Article with respect to such Notes,  until
such time as the Trustee or Paying Agent is permitted to apply all money held in
trust  pursuant to Section  1405 with respect to such Notes in  accordance  with
this  Article;  provided,  however,  that if the  Company  makes any  payment of
principal  of or any  premium  or  interest  on any  such  Note  following  such
reinstatement of its obligations, the Company
                                       67

shall be  subrogated  to the  rights  (if any) of the  Holders  of such Notes to
receive such payment from the money so held in trust.



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


      This  instrument  may be executed in any number of  counterparts,  each of
which so executed shall be deemed to be an original,  but all such  counterparts
shall together constitute but one and the same instrument.

      IN WITNESS  WHEREOF,  the parties  hereto have caused this Indenture to be
duly executed,  and their respective  corporate seals to be hereunto affixed and
attested, all as of the day and year first above written.



                                                  ARIZONA PUBLIC SERVICE COMPANY


                                           By         Nancy E. Newquist
                                             ...................................
                                                         Treasurer

Attest:

Betsy A. Pregulman
 ............................
Associate Secretary


                                           THE BANK OF NEW YORK, as Trustee


                                           By           Walter N. Gitlin
                                             ...................................
                                                         Vice President

Attest:

Robert E. Patterson
 ............................
Assistant Vice President
                                       68

STATE OF ARIZONA           )
                           )  ss.:
COUNTY OF MARICOPA         )


      On the 21st day of November  before me personally  came Nancy E. Newquist,
to me  known,  who,  being  by me duly  sworn,  did  depose  and say that she is
Treasurer of Arizona Public Service Company,  one of the corporations  described
in and which executed the foregoing instrument;  that she knows the seal of said
corporation;  that the seal affixed to said  instrument is such corporate  seal;
that  it was so  affixed  by  authority  of  the  Board  of  Directors  of  said
corporation; and that she signed her name thereto by like authority.


                                             Maria R. Marrs
                                           .....................................

                                           My Commission Expires July 21, 1998
                                                                ................

STATE OF NEW YORK          )
                           )  ss.:
COUNTY OF NEW YORK         )


      On the 20th day of November,  before me personally  came Walter N. Gitlin,
to me known,  who,  being by me duly  sworn,  did depose and say that he is Vice
President  of The Bank of New York,  one of the  corporations  described  in and
which  executed  the  foregoing  instrument;  that  he  knows  the  seal of said
corporation;  that the seal affixed to said  instrument is such corporate  seal;
that  it was so  affixed  by  authority  of  the  Board  of  Directors  of  said
corporation; and that he signed his name thereto by like authority.


                                             William J. Cassels
                                           .....................................

                                           My Commission Expires  May 16, 1998
                                                                ................
                                             
                                       69