PUBLIC SERVICE CO OF COLORADO
8-K, 1998-05-14
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    --------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                                    --------


Date of report (Date of earliest event reported):    MAY 6, 1998
                                                 ----------------------------


                     PUBLIC SERVICE COMPANY OF COLORADO
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in Charter)



     Colorado                        1-3280                      84-0296600
- --------------------------------------------------------------------------------
(State or Other Jurisdiction      (Commission                   (IRS Employer
of Incorporation)                 File Number)               Identification No.)


1225 17th Street, Suite 900, Denver, Colorado                    80202-5533
- --------------------------------------------------------------------------------
(Address of Principal Executive Offices)                         (Zip Code)


Registrant's telephone number, including area code    (303) 571-7511
                                                  ------------------------------


- --------------------------------------------------------------------------------
(Former Name or Former Address, if Changed Since Last Report)

<PAGE>

ITEM 5.   OTHER EVENTS.

          Public Service Company of Colorado (the "Registrant") is filing
herewith the following exhibits in connection with the offering by PSCO Capital
Trust I of 7,760,000 7.60% Trust Originated Preferred Securities pursuant to the
registration statement of the Registrant and PSCO Capital Trust I on Form S-3,
as amended (File No. 333-47485) filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended.

                              INDEX TO EXHIBITS
                                       
EXHIBIT
NUMBER                          EXHIBIT

  1.1          Underwriting Agreement, dated as of May 6, 1998, between the
               Registrant and Merrill Lynch & Co, Merrill Lynch, Pierce, Fenner
               & Smith Incorporated, A.G. Edwards & Sons, Inc., Morgan Stanley &
               Co. Incorporated and PaineWebber Incorporated, as representatives
               of the several underwriters named therein.

  4.1          Amended and Restated Declaration of Trust of PSCO Capital Trust
               I, dated as of May 11, 1998.

  4.2          Indenture, dated as of May 1, 1998, between the Registrant and
               The Bank of New York.

  4.3          First Supplemental Indenture, dated as of May 11, 1998, between
               the Registrant and The Bank of New York.

  4.4          Preferred Securities Guarantee Agreement, dated as of May 11,
               1998 between the Registrant and The Bank of New York.

  8.1          Tax Opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., dated as
               of May 11, 1998.


                                       2
<PAGE>

                                   SIGNATURE

          Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                       PUBLIC SERVICE COMPANY OF COLORADO



Dated: May 13, 1998                    By: /s/ Brian P. Jackson
                                          ---------------------------------
                                          Name:  Brian P. Jackson
                                          Title: Senior Vice President and
                                                 Chief Financial Officer


                                       3
<PAGE>

                                EXHIBIT INDEX


EXHIBIT
NUMBER                       DESCRIPTION
- --------                     -----------
  1.1          Underwriting Agreement, dated as of May 6, 1998, between the
               Registrant and Merrill Lynch & Co, Merrill Lynch, Pierce, Fenner
               & Smith Incorporated, A.G. Edwards & Sons, Inc., Morgan Stanley &
               Co. Incorporated and PaineWebber Incorporated, as representatives
               of the several underwriters named therein.

  4.1          Amended and Restated Declaration of Trust of PSCO Capital Trust
               I, dated as of May 11, 1998.

  4.2          Indenture, dated as of May 1, 1998, between the Registrant and
               The Bank of New York.

  4.3          First Supplemental Indenture, dated as of May 11, 1998, between
               the Registrant and The Bank of New York.

  4.4          Preferred Securities Guarantee Agreement, dated as of May 11,
               1998 between the Registrant and The Bank of New York.

  8.1          Tax Opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., dated as
               of May 11, 1998.


                                       4

<PAGE>

                                          
                                PSCO CAPITAL TRUST I
                       (a Delaware statutory business trust)
                                          
                         PUBLIC SERVICE COMPANY OF COLORADO
                              (a Colorado corporation)
                                          
                                  7,760,000 Shares
                                          
                       TRUST ORIGINATED PREFERRED SECURITIES
                                          
                                          
                               UNDERWRITING AGREEMENT
                                          
DATED:  MAY 6, 1998
                                          
                                          
<PAGE>
                                          
                                          
                                PSCO CAPITAL TRUST I
                       (a Delaware statutory business trust)
                                          
                         PUBLIC SERVICE COMPANY OF COLORADO
                              (a Colorado corporation)
                                          
                                  7,760,000 Shares
                                          
           7.60% Trust Originated Preferred Securities (SM) ("TOPrS-SM-")
                                          
                                          
                                          
                                          
                               Underwriting Agreement
                                                                              
                                                                    May 6, 1998

MERRILL LYNCH & CO.,

Merrill Lynch, Pierce, Fenner & Smith
       Incorporated
  A.G. Edwards & Sons, Inc.
  Morgan Stanley & Co. Incorporated
  PaineWebber Incorporated
  as representatives (the "Representatives")
  of the several Underwriters
  c/o Merrill Lynch & Co.
      Merrill Lynch, Pierce, Fenner & Smith
              Incorporated
North Tower
World Financial Center
New York, New York  10281-1209

Ladies and Gentlemen:

              PSCO CAPITAL TRUST I, a Delaware statutory business trust (the 
"Trust"), and PUBLIC SERVICE COMPANY OF COLORADO, a Colorado corporation 
("PSCo"), propose, subject to the terms and conditions stated herein, that 
the Trust issue and sell to Merrill Lynch & Co., Merrill Lynch, Pierce, 
Fenner & Smith Incorporated ("Merrill Lynch"), A.G. Edwards & Sons, Inc., 
Morgan Stanley & Co. Incorporated, PaineWebber Incorporated and each of the 
other Underwriters named in Schedule I hereto (collectively, the 
"Underwriters," which term shall also include any underwriter substituted as 
hereinafter provided in Section 10 hereof) 7,760,000 7.60% Trust Originated 
Preferred Securities (liquidation amount $25 per security), representing 


- ------------------
SM     "Trust Originated Preferred Securities" and "TOPrS" are service marks of
       Merrill Lynch & Co., Inc.

<PAGE>

                                      -2-


preferred undivided beneficial interests in the assets of the Trust (the 
"Preferred Securities"), guaranteed by PSCo as to the payment of 
distributions and payments upon liquidation or redemption, and benefiting 
from certain additional undertakings of PSCo to the extent set forth in (i) 
the Guarantee Agreement between PSCo and The Bank of New York, as trustee 
thereunder (the "Guarantee Trustee"), to be dated as of the Time of Delivery 
(as defined in Section 2 hereof) (the "Guarantee"), (ii) PSCo's 7.60% 
Deferrable Interest Subordinated Debentures (the "Subordinated Debentures"), 
to be executed at the Time of Delivery, (iii) the Indenture between PSCo and 
The Bank of New York, as trustee thereunder (the "Debenture Trustee"), dated 
as of May 1, 1998, to be supplemented by the First Supplemental Indenture 
thereto relating to the Subordinated Debentures (collectively, the 
"Indenture") and (iv) the declaration of trust between PSCo, as depositor, 
and the trustees named therein (as amended and restated from time to time, 
the "Declaration").

              Concurrently with the issuance of the Preferred Securities and 
PSCo's investment in the common securities of the Trust (the "Common 
Securities") representing undivided beneficial interests in the assets of the 
Trust, the Trust will loan the proceeds thereof to PSCo and, to evidence such 
loan, PSCo will issue and deliver to the Trust the Subordinated Debentures, 
which will be issued under the Indenture.

          SECTION 1.        REPRESENTATIONS AND WARRANTIES.

                    (a)  REPRESENTATIONS AND WARRANTIES BY THE TRUST AND 
PSCO.  Each of the Trust and PSCo, jointly and severally, represents and 
warrants to each Underwriter as of the date hereof, as of the Time of 
Delivery referred to in Section 2(d) hereof, and agrees with each Underwriter 
as follows:

      (i)      REGISTRATION STATEMENT FILING.  A registration 
     statement on Form S-3 (File No. 333-47485), as amended by 
     pre-effective amendment no. 1 thereto, in respect of, among 
     other things, the Preferred Securities, the Guarantee and the 
     Subordinated Debentures (collectively, the "Registered 
     Securities") has been filed with the Securities and Exchange 
     Commission (the "Commission") pursuant to Rule 415 under the 
     Securities Act of 1933, as amended (the "Act"), and delivered 
     to the Representatives; such registration statement and any 
     post-effective amendment thereto, each in the form heretofore 
     delivered to the Representatives, have been declared effective 
     by the Commission in such form; and no stop order suspending 
     the effec-

<PAGE>

                                      -3-

     tiveness of such registration statement has been 
     issued and no proceeding for that purpose has been initiated 
     or, to the knowledge of PSCo and the Trust, threatened by the 
     Commission (any preliminary prospectus included in such 
     registration statement or thereafter filed with the Commission 
     pursuant to Rule 424(a) of the rules and regulations of the 
     Commission under the Act is referred to herein as a 
     "Preliminary Prospectus"; the various parts of such 
     registration statement, including (i) all exhibits thereto, 
     (ii) if applicable, the information contained in the form of 
     prospectus filed with the Commission pursuant to Rule 424(b) 
     under the Act in accordance with Section 5(a) hereof and 
     deemed by virtue of Rule 430A under the Act to be a part of 
     the registration statement at the time it was declared 
     effective and (iii) the documents incorporated by reference in 
     the prospectus contained in the registration statement at the 
     time such part of such registration statement became 
     effective, each as amended at the time such part of such 
     registration statement became effective, are referred to 
     herein collectively as the "Registration Statement"; the final 
     prospectus, as supplemented by the related prospectus 
     supplement, in the form first filed with respect to the 
     Preferred Securities pursuant to Rule 424(b) under the Act, is 
     referred to herein collectively as the "Prospectus"; any 
     reference herein to any Preliminary Prospectus or the 
     Prospectus shall be deemed to refer to and include the 
     documents incorporated by reference therein pursuant to Item 
     12 of Form S-3 under the Act, as of the date of such 
     Preliminary Prospectus or Prospectus, as the case may be; and 
     any reference to any amendment or supplement to any 
     Preliminary Prospectus or the Prospectus shall be deemed to 
     refer to and include any documents filed after the date of 
     such Preliminary Prospectus or Prospectus, as the case may be, 
     under the Securities Exchange Act of 1934, as amended (the 
     "Exchange Act"), and incorporated by reference in such 
     Preliminary Prospectus or Prospectus, as the case may be; and 
     any reference to any amendment to the Registration Statement 
     shall be deemed to refer to and include PSCo's most recent 
     annual report on Form 10-K (the "Form 10-K"), quarterly 
     reports on Form 10-Q or current reports on Form 8-K, if any, 
     filed pursuant to Section 13 or 15(d) of the Exchange Act 
     after the effective date of the Registration Statement that is 
     incorporated by reference in the Registration Statement (the 
     Form 10-K, the quarterly reports on form 10-Q and any current 
     reports on Form 8-K are referred to herein collectively as the 
     "Exchange Act Filings")).

<PAGE>

                                      -4-

               No order preventing or suspending the use of any 
     Preliminary Prospectus has been issued by the Commission, and each 
     Preliminary Prospectus, at the time of filing thereof, conformed in 
     all material respects to the requirements of the Act and the rules 
     and regulations of the Commission thereunder (the "1933 Act 
     Regulations"), and did not contain an untrue statement of a 
     material fact or omit to state a material fact required to be 
     stated therein or necessary to make the statements therein, in the 
     light of the circumstances under which they were made, not 
     misleading; provided, however, that this representation and 
     warranty shall not apply to any statements or omissions made in 
     reliance upon and in conformity with information furnished in 
     writing to the Trust or PSCo by any Underwriter through Merrill 
     Lynch expressly for use therein.
     
      (ii)     INCORPORATED DOCUMENTS.  The documents incorporated or 
     deemed to be incorporated by reference in the Prospectus, when they 
     were or hereafter are filed with the Commission, complied and will 
     comply in all material respects with the requirements of the 
     Exchange Act and the rules and regulations of the Commission 
     thereunder (the "1934 Act Regulations"), and none of such documents 
     contained an untrue statement of a material fact or omitted to 
     state a material fact required to be stated therein or necessary to 
     make the statements therein, in the light of the circumstances 
     under which they were made, not misleading; and any further 
     documents so filed and incorporated by reference in the Prospectus 
     or any further amendment or supplement thereto, when such documents 
     are filed with the Commission, as the case may be, will conform in 
     all material respects to the requirements of the Exchange Act and 
     the 1934 Act Regulations and will not contain an untrue statement 
     of a material fact or omit to state a material fact required to be 
     stated therein or necessary to make the statements therein, in the 
     light of the circumstances under which they were made, not 
     misleading.
     
      (iii)    COMPLIANCE WITH REGISTRATION REQUIREMENTS.  The 
     Registration Statement complies, and the Prospectus and any further 
     amendments or supplements to the Registration Statement or the 
     Prospectus will comply, in all material respects with the 
     requirements of the Act and the Trust Indenture Act of 1939, as 
     amended (the "TIA"), and the rules and regulations of the 
     Commission thereunder and do not and will not (i) as of the 
     applicable effective date as to the Registration Statement and any 
     amendment thereto 

<PAGE>

                                      -5-

     and (ii) as of the applicable filing date and as of the date 
     hereof as to the Prospectus and any amendment or supplement 
     thereto, contain an untrue statement of a material fact 
     or omit to state a material fact required to be stated therein or 
     necessary to make the statements therein not misleading; provided, 
     however, that this representation and warranty shall not apply to 
     (a) any statements or omissions made in reliance upon and in 
     conformity with information furnished in writing to the Trust or 
     PSCo by any Underwriter through Merrill Lynch expressly for use 
     therein or (b) that part of the Registration Statement which shall 
     constitute the Statement of Eligibility (Form T-1) under the TIA.
     
      (iv)     FINANCIAL STATEMENTS.  The financial statements included 
     in the Registration Statement and the Prospectuses, together with 
     the related schedules and notes, present fairly the financial 
     position of PSCo and its consolidated subsidiaries at the dates 
     indicated and the statement of operations, stockholders' equity and 
     cash flows of PSCo and its consolidated subsidiaries for the 
     periods specified; and, except as otherwise stated in the 
     Registration Statement, such financial statements have been 
     prepared in conformity with generally accepted accounting 
     principles ("GAAP") applied on a consistent basis during the 
     periods involved.  The supporting schedules, if any, included in 
     the Registration Statement present fairly in accordance with GAAP 
     the information required to be stated therein.
     
      (v)      INDEPENDENT ACCOUNTANTS.  Arthur Andersen LLP are 
     independent public accountants with respect to PSCo as required by 
     the Act and the 1933 Act Regulations.
     
      (vi)     NO MATERIAL ADVERSE CHANGE IN BUSINESS.  Since the 
     respective dates as of which information is given in the 
     Registration Statement and the Prospectus, except as otherwise 
     stated therein, (A) there has been no material adverse change in 
     the business, property or condition, financial or otherwise, of 
     PSCo and its subsidiaries considered as one enterprise, whether or 
     not arising in the ordinary course of business (a "Material Adverse 
     Effect"), (B) there have been no transactions entered into by PSCo 
     or any of its subsidiaries, other than those in the ordinary course 
     of business, which are material with respect to PSCo and its 
     subsidiaries, considered as one enterprise and (C) except for 
     regular dividends on PSCo's common stock, par value $.01 per share 
     (the "Common Stock") and 

<PAGE>

                                      -6-

     PSCo's preferred stock, in amounts per share that are 
     consistent with past practice, there has been no dividend 
     or distribution of any kind declared, paid or made by PSCo 
     on any class of its capital stock.
     
      (vii)    GOOD STANDING OF THE TRUST.  The Trust has been duly 
     created and is validly existing as a statutory business trust in 
     good standing under the Business Trust Act of the State of Delaware 
     (the "Delaware Business Trust Act") with the trust power and 
     authority to own property and conduct its business as described in 
     the Prospectus, and has conducted and will conduct no business 
     other than the transactions contemplated by this Agreement and 
     described in the Prospectus; the Trust is not a party to or bound 
     by any agreement or instrument other than this Agreement, the 
     Declaration and the agreements and instruments contemplated by the 
     Declaration and described in the Prospectus; the Trust has no 
     liabilities or obligations other than those arising out of the 
     transactions contemplated by this Agreement and the Declaration and 
     described in the Prospectus; the Trust is not a party to or subject 
     to any action, suit or proceeding of any nature; and the Trust is 
     and will, under current law, be classified for United States 
     federal income tax purposes as a grantor trust and not as an 
     association taxable as a corporation.
     
      (viii)   GOOD STANDING OF PSCO.  PSCo has been duly incorporated 
     and is validly existing as a corporation in good standing under the 
     laws of the State of Colorado, with due corporate authority to own 
     and operate its properties and conduct its business as described in 
     the Prospectus and to enter into and perform its obligations under 
     this Agreement; and PSCo is duly qualified as a foreign corporation 
     to transact business and is in good standing in each other 
     jurisdiction in which such qualification is required, whether by 
     reason of the ownership or leasing of property or the conduct of 
     business, except where the failure so to qualify or to be in good 
     standing would not result in a Material Adverse Effect.
     
      (ix)     GOOD STANDING OF SUBSIDIARIES.  Each "significant 
     subsidiary" (as such term is defined in Rule 1-02 of Regulation S-X 
     promulgated under the Act) of PSCo (each a "Significant Subsidiary" 
     and, collectively, the "Significant Subsidiaries") has been duly 
     organized and is validly existing as a corporation in good standing 
     under the laws of the jurisdiction of its incorporation, has 
     corporate power and authority to own, lease and oper-

<PAGE>
                                      -7-

     ate its properties and to conduct its business as described in the 
     Prospectus and is duly qualified as a foreign corporation to 
     transact business and is in good standing in each jurisdiction in 
     which such qualification is required, whether by reason of the 
     ownership or leasing of property or the conduct of business, except 
     where the failure to so qualify or be in good standing would not 
     have a material adverse effect on the business, property, condition 
     (financial or otherwise) or results of operations of PSCo and its 
     subsidiaries, considered as a whole.  Except as otherwise stated in 
     the Registration Statement and the Prospectus, all of the issued 
     and outstanding capital stock of each Significant Subsidiary has 
     been duly authorized and is validly issued, fully paid and 
     non-assessable and is owned by PSCo, directly or through 
     subsidiaries, free and clear of any security interest, mortgage, 
     pledge, lien, encumbrance, claim or equity.  None of the 
     outstanding shares of capital stock of any Significant Subsidiary 
     was issued in violation of preemptive or other similar rights of 
     any securityholder of such Significant Subsidiary.
     
      (x)      ABSENCE OF CONFLICTS BY THE TRUST.  The issuance and sale 
     of the Preferred Securities and the Common Securities by the Trust, 
     the compliance by the Trust with all of the provisions of this 
     Agreement, the purchase of the Subordinated Debentures by the Trust 
     from PSCo, the distribution of the Subordinated Debentures upon the 
     liquidation of the Trust in the circumstances contemplated by the 
     Declaration and described in the Prospectus, and the consummation 
     by the Trust of the transactions contemplated herein and in the 
     Declaration, will not conflict with or result in a breach or 
     violation of any of the terms or provisions of, or constitute a 
     default under, any agreement or instrument to which the Trust is a 
     party or by which the Trust is bound or to which any of the 
     property or assets of the Trust is subject, nor will such action 
     result in any violation of the provisions of the Declaration or any 
     statute or any order, rule or regulation of any court or 
     governmental agency or body having jurisdiction over the Trust or 
     any of its properties.
     
      (xi)     ABSENCE OF DEFAULTS AND CONFLICTS BY PSCo.  Neither PSCo 
     nor any of its subsidiaries is in violation of its charter or 
     by-laws or in default in the performance or observance of any 
     obligation, agreement, covenant or condition contained in any 
     contract, indenture, mortgage, deed of trust, loan or credit 
     agreement, note, lease or 

<PAGE>

                                      -8-

     other agreement or instrument to which PSCo or any of its 
     subsidiaries is a party or by which it or any of them may 
     be bound, or to which any of the property or assets of 
     PSCo or any subsidiary is subject except for such defaults that 
     would not result in a Material Adverse Effect.  The issuance and 
     sale of the Preferred Securities and the Common Securities by the 
     Trust, the issuance by PSCo of the Subordinated Debentures and the 
     Guarantee, the compliance by PSCo and the Trust with all of the 
     provisions of this Agreement, the execution, delivery and 
     performance by PSCo of the Declaration, the Guarantee, the 
     Indenture and the Subordinated Debentures (collectively, the "PSCo 
     Agreements"), the distribution of the Subordinated Debentures upon 
     the liquidation of the Trust in the circumstances contemplated by 
     the Declaration and described in the Prospectus, and the 
     consummation of the transactions herein and therein contemplated, 
     will not conflict with or result in a breach or violation of any of 
     the terms or provisions of, or constitute a default under, any 
     indenture, mortgage, deed of trust, loan agreement or other 
     agreement or instrument to which PSCo is a party or by which PSCo 
     is bound or to which any of the property or assets of PSCo is 
     subject, nor will such action result in any violation of the 
     provisions of the charter or by-laws of PSCo or any statute or any 
     order, rule or regulation of any court or governmental agency or 
     body having jurisdiction over PSCo or any of its properties.
     
      (xii)    AUTHORIZATION AND DESCRIPTION OF COMMON SECURITIES.  The 
     Common Securities have been duly authorized by the Declaration and, 
     when issued and delivered by the Trust to PSCo against payment 
     therefor as described in the Registration Statement and Prospectus, 
     will be validly issued and (subject to the terms of the 
     Declaration) fully paid and non-assessable undivided beneficial 
     interests in the assets of the Trust and will conform in all 
     material respects to the statements relating thereto contained in 
     the Prospectus; the issuance of the Common Securities is not 
     subject to preemptive or other similar rights; and at the Time of 
     Delivery all of the issued and outstanding Common Securities of the 
     Trust will be directly owned by PSCo free and clear of any security 
     interest, mortgage, pledge, lien, encumbrance, claim or equity.
     
      (xiii)   AUTHORIZATION OF UNDERWRITING AGREEMENT.  This Agreement 
     has been duly authorized, executed and delivered by each of PSCo 
     and the Trust.

<PAGE>

                                      -9-

      (xiii)   AUTHORIZATION OF DECLARATION.  The Declaration has been 
     duly authorized by PSCo and, at the Time of Delivery, will have 
     been duly executed and delivered by PSCo and, assuming due 
     authorization, execution and delivery of the Declaration by the 
     Trustees, the Declaration will be a valid and binding obligation 
     enforceable in accordance with its terms except to the extent that 
     enforcement thereof may be limited by bankruptcy, insolvency or 
     reorganization laws relating to or affecting the enforcement of 
     creditors' rights and by general equity principles, and will 
     conform in all material respects to the statements relating thereto 
     contained in the Prospectus; and at the effective date of the 
     Registration Statement, the Declaration was or will have been duly 
     qualified under the TIA.
     
      (xv)     AUTHORIZATION OF GUARANTEE AGREEMENT.  The Guarantee 
     Agreement has been duly authorized by PSCo and, at the Time of 
     Delivery, will have been duly executed and delivered by PSCo and, 
     assuming due authorization, execution and delivery of the Guarantee 
     by the Guarantee Trustee, will constitute a valid and binding 
     obligation of PSCo enforceable in accordance with its terms except 
     to the extent that enforcement thereof may be limited by 
     bankruptcy, insolvency or reorganization laws relating to or 
     affecting the enforcement of creditors' rights and by general 
     equity principles, and the Guarantee and the Guarantee Agreement 
     will conform in all material respects to the statements relating 
     thereto contained in the Prospectus; and at the effective date of 
     the Registration Statement the Guarantee Agreement was or will have 
     been duly qualified under the TIA.
     
      (xvi)    AUTHORIZATION AND DESCRIPTION OF PREFERRED SECURITIES.  
     The Preferred Securities have been duly authorized by the 
     Declaration and, when issued and delivered pursuant to this 
     Agreement, will be validly issued and (subject to the terms of the 
     Declaration) fully paid and non-assessable undivided beneficial 
     interests in the Trust, will be entitled to the benefits of the 
     Declaration and will conform in all material respects to the 
     statements relating thereto contained in the Prospectus; the 
     issuance of the Preferred Securities is not subject to preemptive 
     or other similar rights.
     
      (xvii)   AUTHORIZATION OF THE INDENTURE.  The Indenture has been 
     duly authorized by PSCo and, at the Time of Delivery, will have 
     been duly executed and delivered by PSCo and, assuming due 
     authorization, execution and delivery by 

<PAGE>

                                      -10-

     the Indenture Trustee, will constitute a valid and binding agreement
     of PSCo enforceable in accordance with its terms except to the extent
     that enforcement thereof may be limited by bankruptcy, insolvency or
     reorganization laws relating to or affecting the enforcement of creditors'
     rights and by general equity principles, and will conform in all material 
     respects to the statements relating thereto contained in the Prospectus;
     and at the effective date of the Registration Statement, the Indenture
     was or will have been duly qualified under the TIA.
     
      (xviii)  AUTHORIZATION AND DESCRIPTION OF SUBORDINATED DEBENTURES. 
     The Subordinated Debentures have been duly authorized by PSCo 
     and, at the Time of Delivery, will have been duly executed 
     by PSCo and, when authenticated in the manner provided for in the 
     Indenture and delivered against payment therefor as described in 
     the Prospectus, will constitute valid and binding obligations of 
     PSCo enforceable in accordance with their terms except to the 
     extent that enforcement thereof may be limited by bankruptcy, 
     insolvency or reorganization laws relating to or affecting the 
     enforcement of creditors' rights and by general equity principles; 
     will be in the form contemplated by, and entitled to the benefits 
     of, the Indenture; and will conform in all material respects to the 
     statements relating thereto contained in the Prospectus.
     
      (xix)    INVESTMENT COMPANY ACT.  Neither PSCo nor the Trust is, 
     and upon the issuance and sale of the Preferred Securities as 
     herein contemplated and the application of the proceeds therefrom 
     as described in the Prospectus will not be, an "investment company" 
     or an entity "controlled" by an "investment company" as such terms 
     are defined in the Investment Company Act of 1940, as amended (the 
     "1940 Act").
     
      (xx)     ABSENCE OF FURTHER REQUIREMENTS.  No consent, approval, 
     authorization, order, registration or qualification of or with any 
     court or governmental agency or body having jurisdiction over the 
     Trust or PSCo or any of their properties is required for the 
     issuance and sale of the Preferred Securities and Common Securities 
     by the Trust, the issuance by PSCo of the Subordinated Debentures 
     and the Guarantee, the purchase of the Subordinated Debentures by 
     the Trust from PSCo, the distribution of the Subordinated 
     Debentures upon the liquidation of the Trust in the circumstances 
     contemplated by the Declaration and described in the Prospectus, 
     the execution, delivery and 

<PAGE>

                                      -11-

     performance by PSCo of the PSCo Agreements, or the consummation of the
     transactions contemplated herein or therein, except the registration of the
     Registered Securities under the Act, registration of the Preferred
     Securities under the Exchange Act, the qualification of the Declaration,
     the Indenture and the Guarantee under the TIA, the filing of an 
     application with and receipt of an order from, the Public Utilities 
     Commission of the State of Colorado (the "Colorado Commission") and 
     the Commission under the Public Utility Holding Company Act of 
     1935, as amended (the "1935 Act"), with respect to the transaction 
     contemplated by the PSCo Agreements and such consents, approvals, 
     authorizations, registrations or qualifications as may be required 
     under state securities or Blue Sky laws in connection with the 
     issuance and sale, as the case may be, of the Registered Securities.
     
      (xxi)    FRANCHISES.  The franchises held by PSCo and its 
     subsidiaries, together with the applicable Certificates of 
     Convenience and Necessity issued by the Colorado Commission, give 
     PSCo and such subsidiaries all necessary authority for the 
     maintenance and operation of their respective properties and 
     business as now conducted, and are free from burdensome 
     restrictions or conditions of an unusual character;

                    (b)  OFFICER'S CERTIFICATES.  Any certificate signed by 
any officer of PSCo or the Trust delivered to the Representatives or to 
counsel for the Underwriters shall be deemed a representation and warranty by 
PSCo and by the Trust to each Underwriter as to the matters covered thereby.

          SECTION 2.     SALE AND DELIVERY TO UNDERWRITERS; CLOSING.

                    (a)  PREFERRED SECURITIES.  Subject to the terms and 
conditions herein set forth, the Trust agrees to issue and sell to each of 
the Underwriters, and each of the Underwriters agrees, severally and not 
jointly, to purchase, at a purchase price per share of $25.00 per Preferred 
Security, the number of Preferred Securities set forth opposite the name of 
such Underwriter in Schedule I hereto, plus any additional Preferred 
Securities which such Underwriter may become obligated to purchase pursuant 
to the provisions of Section 10 hereof.

                    (b)  PAYMENT.  As compensation to the Underwriters for 
their commitments hereunder, and in view of the fact that the proceeds of the 
sale of the Preferred Securities will be 

<PAGE>
                                      -12-

used by the Trust to purchase the Subordinated Debentures of PSCo, PSCo 
hereby agrees to pay at the Time of Delivery to Merrill Lynch, for the 
accounts of the several Underwriters, an amount equal to $0.7875 per share 
for the Preferred Securities, except that such commission will be $0.50 per 
Preferred Security sold to certain institutions by wire transfer of 
immediately available funds.

                    (c)  OFFERING OF SECURITIES.  Upon the authorization by 
the Representatives of the release of the Preferred Securities, the several 
Underwriters propose to offer the Preferred Securities for sale upon the 
terms and conditions set forth in the Prospectus.

                    (d)  CLOSING.  The Preferred Securities to be purchased 
by each Underwriter hereunder will be represented by a global certificate or 
certificates in book-entry form which will be deposited by or on behalf of 
the Trust with The Depository Trust Company ("DTC") or its designated 
custodian and registered in the name of Cede & Co., as nominee of DTC.  The 
Trust will deliver the Preferred Securities to Merrill Lynch, for the account 
of each Underwriter, against payment by or on behalf of such Underwriter of 
the purchase price therefor by wire transfer of immediately available funds 
to the Trust, by causing DTC to credit the Preferred Securities to the 
account of Merrill Lynch at DTC.  The time, date and location of such 
delivery and payment (the "Time of Delivery") shall be 10:00 a.m., New York 
time, on May 11, 1998, or at such other time, date and location as the 
Representatives, the Trust and PSCo may agree upon in writing at LeBoeuf, 
Lamb, Greene & MacRae, L.L.P., 125 West 55th Street, New York, New York 10019.

                    At the Time of Delivery, PSCo will pay, or cause to be 
paid, the compensation payable to the Underwriters under Section 2 hereof by 
wire transfer of immediately available funds to Merrill Lynch, on behalf of 
the Underwriters.

         SECTION 3.      COVENANTS OF PSCO AND THE TRUST.  Each of the Trust 
and PSCo, jointly and severally, agrees with each of the Underwriters:

          (a)  COMPLIANCE WITH SECURITIES REGULATIONS AND COMMISSION 
     REQUESTS. To prepare the Prospectus in a form approved by the 
     Representatives and to file such Prospectus pursuant to Rule 424(b) 
     under the Act within the time prescribed under Rule 424(b) or Rule 
     430A(a)(3), as the case may be, under the Act; to make no further 
     amendment or supplement to the Registration Statement or the 
     Prospectus 

<PAGE>

                                      -13-

     prior to the Time of Delivery to which the Representatives reasonably 
     object promptly after reasonable notice thereof; to advise the 
     Representatives, promptly after it receives notice thereof, of the 
     time when any amendment to the Registration Statement has been 
     filed or becomes effective or any supplement to the Prospectus 
     or any amended Prospectus has been filed and to furnish the 
     Representatives with copies thereof; in the case of PSCo, prior 
     to the termination of the offering of the Preferred Securities, 
     to file promptly all reports and any definitive proxy or 
     information statements required to be filed with the Commission 
     pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act; 
     to advise the Representatives, promptly after it receives notice 
     thereof, of the issuance by the Commission of any stop order or of 
     any order preventing or suspending the use of any Preliminary 
     Prospectus or Prospectus, of the suspension of the qualification of 
     the Registered Securities for offering or sale in any jurisdiction, 
     of the initiation or threatening of any proceeding for any such 
     purpose, or of any request by the Commission for the amending or 
     supplementing of the Registration Statement or Prospectus or for 
     additional information; and, in the event of the issuance of any 
     stop order or of any order preventing or suspending the use of any 
     prospectus relating to the Registered Securities or suspending any 
     such qualification, to use promptly its best efforts to obtain its 
     withdrawal.
     
          (b)  BLUE SKY QUALIFICATION.  To use its best efforts, in 
     cooperation with the Underwriters, to qualify the Registered 
     Securities for offering and sale under the securities laws of such 
     jurisdictions of the United States as the Representatives may 
     designate and to comply with such laws so as to permit the 
     continuance of sales and dealings therein in such jurisdictions for 
     as long as may be necessary to complete the distribution of the 
     Preferred Securities, provided that in connection therewith neither 
     the Trust nor PSCo shall be required to qualify as a foreign 
     corporation or to file a general consent to service of process in 
     any jurisdiction.
     
          (c)  DELIVERY OF PROSPECTUSES.  To furnish the Underwriters 
     with copies of the Prospectus in such quantities as the 
     Representatives may reasonably request, and, if the delivery of a 
     prospectus is required in connection with the offering or sale of 
     the Preferred Securities and if at such time any event shall have 
     occurred as a result of which the Prospectus as then amended or 
     supplemented would 

<PAGE>

                                      -14-

     contain an untrue statement of a material fact or omit to 
     state any material fact necessary in order to make the 
     statements therein, in the light of the circumstances under which 
     they were made when such Prospectus is delivered, not misleading, 
     or, if or any other reason it shall be necessary during such period 
     to amend or supplement the Prospectus or to file under the Exchange 
     Act any document incorporated by reference in the Prospectus in 
     order to comply with the Act or the Exchange Act, to notify the 
     Representatives and upon the request of the Representatives to file 
     such document and to prepare and furnish without charge to each 
     Underwriter and to any dealer in securities as many copies as the 
     Representatives may reasonably request of an amended Prospectus or 
     a supplement to the Prospectus which will correct such statement or 
     omission or effect such compliance.
     
          (d)  RULE 158.  The Trust will make generally available to its 
     security holders as soon as practicable, an earnings statement of 
     PSCo (in form complying with the provisions of Rule 158 under the 
     Act) covering the 12-month period beginning not later than the 
     first day of PSCo's fiscal quarter next following the effective 
     date (as defined in Rule 158) of the Registration Statement.
     
          (e)  RESTRICTION ON SALE OF SECURITIES.  During a period of 30 
     days from the date of the Prospectus, PSCo will not, without the 
     prior written consent of Merrill Lynch, (i) directly or indirectly, 
     offer, pledge, sell, contract to sell, sell any option or contract 
     to purchase, purchase any option or contract to sell, grant any 
     option, right or warrant to purchase or otherwise transfer or 
     dispose of any Preferred Securities, any other preferred beneficial 
     interests in any trust or any securities which are substantially 
     similar to the Subordinated Debentures, the Guarantee or the 
     Preferred Securities, or any securities convertible into or 
     exchangeable for or representing the right to receive any of the 
     afore-mentioned securities (other than the Preferred Securities and 
     Subordinated Debentures issued pursuant to this Agreement) or file 
     a registration statement under the Act with respect to the 
     foregoing or (ii) enter into any swap or any other agreement or any 
     transaction that transfers, in whole or in part, directly or 
     indirectly, the economic consequence of ownership of the Preferred 
     Securities, whether any such swap or transaction described in 
     clause (i) or (ii) above is to be settled by delivery of Preferred 
     Securities or such other securities, in cash or otherwise.

<PAGE>

                                      -15-

          (f)  REPORTING REQUIREMENTS.  PSCo, during the period when the 
     Prospectus is required to be delivered under the 1933 Act or the 
     1934 Act, will file all documents required to be filed with the 
     Commission pursuant to the 1934 Act within the time periods 
     required by the 1934 Act and the 1934 Act Regulations.
     
          (g)  ISSUANCE OF GUARANTEE AND SUBORDINATED DEBENTURES.  In 
     the case of PSCo, to issue the Guarantee and the Subordinated 
     Debentures concurrently with the issuance and sale of the Preferred 
     Securities as contemplated herein.
     
          (h)  LISTING.  To use their best efforts to list, subject to 
     notice of issuance, (i) the Preferred Securities and (ii) upon any 
     distribution upon the liquidation of the Trust to holders of the 
     Preferred Securities, the Subordinated Debentures, in each case on 
     the New York Stock Exchange.
     
          (i)  DELIVERY OF REGISTRATION STATEMENTS.  To the extent not 
     previously so furnished, to furnish to Merrill Lynch two signed 
     copies of the Registration Statement, as initially filed with the 
     Commission, of all amendments thereto, and of all documents 
     incorporated by reference therein (including all exhibits filed 
     therewith, other than exhibits which have previously been furnished 
     to you), two signed copies of each consent and certificate of 
     independent accountants and of each other person who by his 
     profession gives authority to statements made by him and who is 
     named in the Registration Statement as having prepared, certified 
     or reviewed any part thereof, and to furnish to you sufficient 
     unsigned copies of the foregoing (other than exhibits, including 
     consents filed as exhibits, to the Registration Statement) as you 
     may reasonably request for distribution.
     
          (j)  USE OF PROCEEDS.  To apply the net proceeds from the sale 
     of the Securities in the manner set forth in the Prospectus.
     
          SECTION 4.     PAYMENT OF EXPENSES.  
     
                    (a)  EXPENSES.  The Trust and PSCo, jointly and 
severally, covenant and agree with the several Underwriters that they will 
pay the following: (i) the fees, disbursements and expenses of the Trust's 
and PSCo's counsel and accountants in connection with the registration of the 
Registered Securities 

<PAGE>

                                      -16-

under the Act and all other expenses in connection with the preparation, 
printing and filing of the Registration Statement, any Preliminary Prospectus 
and the Prospectus and any amendments and supplements thereto and the mailing 
and delivering of copies thereof to the Underwriters and dealers; (ii) the 
cost of printing or producing any Agreement Among Underwriters, this 
Agreement, the Blue Sky and Legal Investment Memoranda and any other 
documents in connection with the offering, purchase, sale and delivery of the 
Registered Securities; (iii) all expenses in connection with the 
qualification of the Registered Securities for offering and sale under state 
securities laws as provided in Section 3(b) hereof, including the fees and 
disbursements of counsel for the Underwriters in connection with such 
qualification and in connection with the Blue Sky and Legal Investment 
Memoranda; (iv) any fees charged by Standard & Poor's Ratings Services, 
Moody's Investors Service, Inc. or Duff & Phelps Credit Rating Co. (each, a 
"Rating Agency") for rating the Preferred Securities; (v) the costs and 
charges of the transfer agent or registrar; (vi) the costs of any depository 
arrangements for the Preferred Securities with DTC or any successor 
depository; (vii) all fees and reasonable expenses of the Trustees, the 
Debenture Trustee and the Guarantee Trustee and any agent thereof and the 
fees and disbursements of their counsel; (viii) all fees and expenses in 
connection with the listing of the Preferred Securities and, if applicable, 
the Subordinated Debentures on the New York Stock Exchange and the cost of 
registering the Preferred Securities under Section 12 of the Exchange Act; 
(ix) the printing of the Preferred Securities and the Subordinated Debentures 
in certificated form, if required; and (x) all other costs and expenses 
incident to the performance of obligations hereunder which are not otherwise 
specifically provided for in this Section.  It is understood, however, that, 
except as provided in this Section, Section 8 and Section 12 hereof, the 
Underwriters will pay all of their own costs and expenses, including the fees 
of their counsel, stock transfer taxes on resale of any of the Preferred 
Securities by them, and any advertising expenses connected with any offers 
they may make.

                    (b)  TERMINATION OF AGREEMENT.  If this Agreement is 
terminated by the Representatives in accordance with the provisions of 
Section 5 or Section 9(a)(i) hereof, PSCo and the Trust, jointly and 
severally, shall reimburse the Underwriters for all of their out-of-pocket 
expenses, including the reasonable fees and disbursements of counsel for the 
Underwriters.

          SECTION 5.     CONDITIONS OF UNDERWRITERS' OBLIGATIONS.  The 
obligations of the Underwriters hereunder are subject to 

<PAGE>
                                      -17-

the accuracy of the representations and warranties of the Trust and PSCo 
contained in Section 1 hereof or in certificate of any officer of PSCo or any 
trustee of the Trust delivered pursuant to the provisions hereof, to the 
performance by PSCo and the Trust of their covenants and other obligations 
hereunder, and to the following additional conditions:

          (a)  EFFECTIVENESS OF REGISTRATION STATEMENT.  The Prospectus 
     shall have been filed with the Commission pursuant to Rule 424(b) 
     and Rule 430A(a)(3), if applicable, within the applicable time 
     period prescribed for such filing by the rules and regulations 
     under the Act and in accordance with Section 5(a) hereof; and no 
     stop order suspending the effectiveness of the Registration 
     Statement or any part thereof shall have been issued and no 
     proceeding for that purpose shall have been initiated or threatened 
     by the Commission.
     
          (b)  ORDER OF COLORADO COMMISSION.  At the Time of Delivery, 
     the order of the Colorado Commission authorizing and approving the 
     issuance and sale of the Registered Securities shall be final and 
     in full force and effect and the time for appeal therefrom or 
     review thereof or intervention with respect thereto shall have 
     expired.
     
          (c)  OPINION OF COUNSEL FOR UNDERWRITERS.  Cahill Gordon & 
     Reindel, counsel for the Underwriters, shall have furnished to the 
     Representatives their written opinion, dated the Time of Delivery, 
     with respect to the matters referred to in clauses (ii), (iii), 
     (iv), (vii), (viii) and (xii) of Section 5(d) hereof and such 
     related matters as you may request (it being understood that such 
     counsel may rely as to all matters of Colorado law and legal 
     conclusions based thereon upon the opinion of counsel for PSCo 
     referred to in Section 5(d) hereof and as to all matters of 
     Delaware law and legal conclusions based thereon upon the opinion 
     of counsel referred to in Section 5(e) hereof); and such counsel 
     shall have received such papers and information as they may 
     reasonably request to enable them to pass upon such matters.
     
          (d)  OPINION OF COUNSEL FOR COMPANY.  LeBoeuf, Lamb, Greene & 
     MacRae, L.L.P., counsel for PSCo and the Trust shall have furnished 
     to the Representatives their written opinion, dated the Time of 
     Delivery, in form and substance satisfactory to the Representatives,
     to the effect that:

<PAGE>

                                      -18-

      (i)  PSCo has been duly incorporated and is validly 
     existing as a corporation in good standing under the laws of 
     the State of Colorado, with corporate power and authority to 
     own its properties and conduct its business as described in 
     the Prospectus.  To the best of our knowledge, PSCo is duly 
     qualified as a foreign corporation to transact business and is 
     in good standing in each jurisdiction in which such 
     qualification is required, except where the failure to so 
     qualify or be in good standing would not have a material 
     adverse effect on the business, properties or operations of 
     PSCo and its subsidiaries considered as one enterprise;
     
      (ii)     The PSCo Agreements each have been duly authorized, 
     executed and delivered by PSCo and constitute valid 
     instruments or obligations, as the case may be, legally 
     binding upon and enforceable against PSCo (except as limited 
     by bankruptcy, insolvency or other laws or equitable 
     principles affecting creditors' rights generally); and the 
     Subordinated Debentures are entitled to the benefits provided 
     by the Indenture;
     
      (iii)    This Agreement has been duly authorized, executed 
     and delivered by PSCo and the Trust;
     
      (iv)     The Declaration, the Indenture and the Guarantee 
     have been duly qualified under the TIA;
     
      (v)      The issuance and sale of the Preferred Securities and
     the Common Securities by the Trust, the compliance by the Trust 
     with all of the provisions of this Agreement, the purchase of 
     the Subordinated Debentures by the Trust from PSCo, the 
     distribution of the Subordinated Debentures upon the 
     liquidation of the Trust in the circumstances contemplated by 
     the Declaration and described in the Prospectus, and the 
     consummation of the transactions contemplated herein and in 
     the Declaration, will not conflict with or result in a breach 
     or violation of any of the terms or provisions of, or 
     constitute a default under, any agreement or instrument known 
     to such counsel to which the Trust is a party or by which the 
     Trust is bound or to which any of the property or assets of 
     the Trust is subject, nor will such action result in any 
     violation of the provisions of the Declaration or any statute 
     or any order, rule or regulation known to 

<PAGE>
                                      -19-

     such counsel of any court or government agency or body having
     jurisdiction over the Trust or any of its properties;
     
      (vi)     The issuance and sale of the Preferred Securities 
     and the Common Securities by the Trust, the issuance by PSCo 
     of the Guarantee and the Subordinated Debentures, the 
     compliance by PSCo and the Trust with all of the provisions of 
     this Agreement, the execution, delivery and performance by 
     PSCo of the PSCo Agreement, the distribution of the 
     Subordinated Debentures upon the liquidation of the Trust in 
     the circumstances contemplated by the Declaration and 
     described in the Prospectus (including the use of the proceeds 
     by PSCo to redeem its outstanding preferred stock) and the 
     consummation of the transactions herein and therein 
     contemplated, will not conflict with or result in a breach or 
     violation of any of the terms or provisions of, or constitute 
     a default under, any agreement or instrument known to such 
     counsel to which PSCo is a party or by which PSCo is bound or 
     to which any of the property or assets of PSCo is subject, nor 
     will such action result in any violation of the provisions of 
     the charter or by-laws of PSCo or any statute or any order, 
     rule or regulation known to such counsel of any court or 
     governmental agency or body having jurisdiction over PSCo or 
     any of its properties;
     
      (vii)    The Registered Securities conform as to legal 
     matters to the statements concerning them in the Prospectus; 
     and the summaries of the PSCo Agreements contained in the 
     Prospectus constitute correct summaries thereof in all 
     material respects for use therein;
     
      (viii)   The statements set forth in the Prospectus under the 
     captions "Description of the Preferred Securities of the 
     Trust," "Certain Terms of the Preferred Securities," 
     "Description of the Preferred Securities Guarantee," 
     "Description of the Debt Securities," insofar as it relates to 
     the Subordinated Debt Securities and "Certain Terms of the 
     Subordinated Debentures," insofar as they constitute summaries 
     or matters of law or legal conclusions, fairly present the 
     information set forth therein;

<PAGE>
                                      -20-

      (ix)     The statements in PSCo's Annual Report on Form 10-K for
     the fiscal year ended December 31, 1997, incorporated by reference 
     into the Prospectus, under the heading "Character of 
     Ownership" in Item 2. Properties, and insofar as they are, or 
     refer to, statements of law or legal conclusions, have been 
     prepared or reviewed by us and are correct in all material 
     respects and fairly present the information purported to be 
     given;
     
      (x)      To the best of our knowledge, neither PSCo nor any 
     subsidiary is in violation of its charter or by-laws and no 
     default by PSCo or any subsidiary exists in the due 
     performance or observance of any material contract, indenture, 
     mortgage, loan agreement, note, lease or other agreement or 
     instrument;
     
      (xi)     The documents incorporated by reference in the 
     Prospectus or any further amendment or supplement thereto made 
     by the Trust or PSCo prior to the Time of Delivery (other than 
     the financial statements and related schedules therein, as to 
     which such counsel need express no opinion), when they were 
     filed with the Commission, complied as to form in all material 
     respects with the requirements of the Exchange Act and the 
     1934 Act Regulations;
     
      (xii)    The Registration Statement is effective under the 
     Act and, to the best of our knowledge, no proceedings for a 
     stop order have been instituted or are pending or threatened 
     under Section 8(d) of the Act.  The Registration Statement and 
     the Prospectus and any further amendments and supplements 
     thereto made by the Trust or PSCo prior to the Time of 
     Delivery (other than the financial statements (including the 
     notes thereto) and related schedules and other financial or 
     statistical data contained or incorporated by reference 
     therein, as to which such counsel need express no opinion) 
     comply as to form in all material respects with the 
     requirements of the Act and the TIA and the rules and 
     regulations thereunder;
     
      (xiii)   Neither the Trust nor PSCo is, and upon the issuance 
     and sale of the Preferred Securities as contemplated by this 
     Agreement and the application of the proceeds therefrom as 
     described in the Prospectus will not be, an "investment 
     company" or an entity "controlled" by an "investment company" 
     required to 

<PAGE>
                                      -21-

     be registered under the Investment Company Act of 1940, as amended;

      (xiv)    The statements made in the Prospectus under the caption 
     "United States Taxation," to the extent they constitute matters of 
     law or legal conclusions, have been reviewed by such counsel and 
     are accurate, complete and correct in all material respects and 
     fairly present the information set forth therein; and

      (xv)     To the extent required by law, the issuance and sale 
     of the Preferred Securities, the Common Securities, the 
     Subordinated Debentures and the Guarantee have been duly 
     authorized and approved by an order of The Public Utilities 
     Commission of the State of Colorado, and by an order of the 
     Securities and Exchange Commission under the Public Utility 
     Holding Company Act of 1935, as amended, and each such order 
     is final and in full force and effect on the date hereof, the 
     time for appeal therefrom or review thereof or intervention 
     with respect thereto having expired; no further approval, 
     authorization, consent or other order of any public board or 
     body is legally required (other than in connection or 
     compliance with the provisions of the securities laws of any 
     jurisdiction) for the issuance and sale by the Trust of the 
     Preferred Securities and the Common Securities and the 
     issuance and sale by PSCo of the Subordinated Debentures and 
     the Guarantee pursuant to this Agreement.
     
          Such counsel shall state that it does not know of any legal or 
     governmental proceeding (pending or threatened) required to be 
     described in the Registration Statement or Prospectus, as amended 
     or supplemented to the date hereof, which is not described as 
     required, nor of any contract or document of a character required 
     to be described in the Registration Statement or the Prospectus, as 
     amended or supplemented to the date hereof, or to be filed as an 
     exhibit to the Registration Statement which is not described or 
     filed as required.
     
          Such counsel shall also state that in connection with their 
     opinion, they have participated in discussions with officers and 
     representatives of PSCo, in certain of which your representatives 
     and counsel also participated and at which the affairs of PSCo and 
     the contents of the Registration Statement and the Prospectus were 
     discussed.

<PAGE>
                                      -22-

     There is no assurance that all possible material facts as to PSCo 
     were disclosed to such counsel or that such counsel's familiarity 
     with PSCo or the operations in which it is engaged is such that 
     such counsel have necessarily recognized the materiality of such 
     facts as were disclosed, and such counsel have to a large extent 
     relied upon statements of officers and representatives of PSCo as 
     to the materiality of those facts disclosed to such counsel.  Such 
     counsel are not passing upon and do not assume any responsibility 
     for the accuracy, completeness or fairness of the statements 
     contained in the Registration Statement and the Prospectus except 
     to the limited extent referred to in paragraphs (vii), (viii), 
     (ix), and (xiv) above.  Subject to the foregoing, and to the other 
     limitations and qualifications expressed in this letter, such 
     counsel may state that nothing has come to its attention that would 
     lead such counsel to believe that the Registration Statement, when 
     it became effective or on the date of this Agreement, contained an 
     untrue statement of a material fact or omitted to state a material 
     fact required to be stated therein or necessary to make the 
     statements therein not misleading, or that, at the date the 
     Prospectus Supplement was filed with the Securities and Exchange 
     Commission, the Prospectus included, or, at the date hereof, the 
     Prospectus, as it may have been amended or supplemented, includes 
     an untrue statement of a material fact or omitted, or omits, to 
     state a material fact necessary in order to make the statements 
     therein, in the light of the circumstances under which they were 
     made, not misleading; provided that such counsel need not express 
     any belief as to the financial statements (including the notes 
     thereto) and related schedules or other financial or statistical 
     data contained or incorporated by reference in the Registration 
     Statement or the Prospectus, or any amendment or supplement 
     thereto, as to any information contained therein furnished to the 
     Company in writing by any Underwriter through Merrill Lynch 
     expressly for use therein or as to the Statements of Eligibility 
     (Form T-1).

          (e)  OPINION OF COUNSEL FOR TRUST.  Richards, Layton & Finger, 
     P.A., special Delaware counsel for the Trust and PSCo, shall have 
     furnished to the Representatives their written opinion, dated the 
     Time of Delivery, in form and substance satisfactory to the 
     Representatives, to the effect that:

        (i) The Trust has been duly created and is validly existing 
     in good standing as a business trust 

<PAGE>
                                      -23-

     under the Delaware Business Trust Act, and all filings required
     under the laws of the State of Delaware with respect to the creation
     and valid existence of the Trust as a business trust have been made;
     
      (ii)     Under the Delaware Business Trust Act and the 
     Declaration, the Trust has the trust power and authority to own 
     property and conduct its business as described in the Prospectus;
     
      (iii)    Under the Delaware Business Trust Act and the 
     Declaration, the Trust has the trust power and authority (a) 
     to execute and deliver, and to perform its obligations under, 
     this Agreement and (b) to issue and perform its obligations 
     under the Preferred Securities and the Common Securities;
     
      (iv)     Under the Delaware Business Trust Act and the 
     Declaration, the execution and delivery by the Trust of this 
     Agreement, and the performance by the Trust of its obligations 
     hereunder, have been duly authorized by all necessary trust 
     action on the part of the Trust;
     
      (v)      The Declaration constitutes a legal, valid and binding 
     obligation of PSCo and the Trustees, enforceable against PSCo 
     and the Trustees, in accordance with its terms, subject, as to 
     enforcement, to the effect upon the Declaration of (a) 
     bankruptcy, insolvency, moratorium, receivership, liquidation, 
     fraudulent transfer or conveyance, reorganization and other 
     similar laws relating to or affecting the remedies and rights 
     of creditors, (b) principles of equity, including applicable 
     law relating to fiduciary duties (regardless of whether 
     considered or applied in a proceeding in equity or at law) and 
     (c) the effect of applicable public policy on the 
     enforceability of provisions relating to indemnification or 
     contribution;
     
      (vi)     The Preferred Securities have been duly authorized 
     by the Declaration and are duly and validly issued and, subject 
     to the qualifications set forth herein, fully paid and non-assessable 
     undivided beneficial interests in the assets of the Trust; the 
     holders of the Preferred Securities, as beneficial owners of the Trust 
     (the "Securityholders"), are entitled to the same limitation of personal 
     liability 

<PAGE>
                                      -24-

     extended to stockholders of private corporations for profit 
     organized under the General Corporation Law of the State of 
     Delaware; and provided that such counsel may note that the 
     Securityholders may be obligated, pursuant to the Declaration, to 
     (a) provide indemnity and/or security in connection with and pay a 
     sum sufficient to cover any taxes or governmental charges arising 
     from transfers or exchanges of Preferred Securities certificates 
     and the issuance of replacement Preferred Securities certificates 
     and (b) provide security and/or indemnity in connection with 
     requests of or directions to the Property Trustee (as defined in 
     the Declaration) to exercise its rights and powers under the 
     Declaration; and under the Delaware Business Trust Act and the 
     Declaration, the issuance of the Preferred Securities is not 
     subject to preemptive or other similar rights;
     
      (vii)    the Common Securities have been duly authorized by the 
     Declaration and are duly and validly issued and fully paid 
     undivided beneficial interests in the assets of the Trust; and 
     under the Delaware Business Trust Act and the Declaration, the 
     issuance of the Common Securities is not subject to preemptive or 
     other similar rights;
     
      (viii)   The issuance and sale by the Trust of the Preferred 
     Securities and the Common Securities, the execution, delivery and 
     performance by the Trust of this Agreement, the consummation by the 
     Trust of the transactions contemplated herein and the compliance by 
     the Trust with its obligations hereunder do not violate (a) any of 
     the provisions of the Certificate of Trust of the Trust or the 
     Declaration or (b) any applicable Delaware law or Delaware 
     administrative regulation;
     
      (ix)     Assuming that the Trust derives no income from or 
     connected with sources within the State of Delaware and has no 
     assets, activities (other than having a Delaware trustee as 
     required by the Delaware Business Trust Act and the filing of 
     documents with the Secretary of State of the State of Delaware) or 
     employees in the State of Delaware, no authorization, approval, 
     consent or order of any Delaware court or Delaware governmental 
     authority or Delaware agency is required to be obtained by the 
     Trust solely as a result of the issuance and sale of the Preferred 
     Secu-

     <PAGE>
                                      -25-

     rities, the consummation by the Trust of the transactions contemplated 
     herein or the compliance by the Trust of its obligations hereunder; and

      (x) Assuming that the Trust derives no income from or 
     connected with sources within the State of Delaware and has no 
     assets, activities (other than having a Delaware trustee as 
     required by the Delaware Business Trust Act and the filing of 
     documents with the Secretary of State of the State of 
     Delaware) or employees in the State of Delaware, and assuming 
     that the Trust is treated as a grantor trust for federal 
     income tax purposes, the Securityholders (other than those 
     holders of the Preferred Securities who reside or are 
     domiciled in the State of Delaware) will have no liability for 
     income taxes imposed by the State of Delaware solely as a 
     result of their participation in the Trust, and the Trust will 
     not be liable for any income tax imposed by the State of 
     Delaware (in rendering the opinions, such counsel need express 
     no opinion concerning the securities laws of the State of 
     Delaware).
     
          (f)  OFFICERS' CERTIFICATE.  At the Time of Delivery, there 
     shall not have been, since the date hereof or since the respective 
     dates as of which information is given in the Prospectus, any 
     material adverse change in the business, property or condition, 
     financial or otherwise, of PSCo and its subsidiaries, considered as 
     one enterprise, whether or not arising in the ordinary course of 
     business, and the Representatives shall have received a certificate 
     of the President or a Vice President of PSCo and of the chief 
     financial officer, chief accounting officer or Treasurer of PSCo, 
     dated as of the Time of Delivery, to the effect that (i) there has 
     been no such material adverse change, (ii) the representations and 
     warranties in Section 1(a) hereof are true and correct with the 
     same force and effect as though expressly made at and as of the 
     Time of Delivery, (iii) PSCo has complied with all agreements and 
     satisfied all conditions on its part to be performed or satisfied 
     at or prior to the Time of Delivery, and (iv) no stop order 
     suspending the effectiveness of the Registration Statement has been 
     issued and no proceedings for that purpose have been instituted or 
     are pending or are contemplated by the Commission.
     
          (g)  ACCOUNTANT'S COMFORT LETTER.  On the date of this 
     Agreement, Arthur Andersen LLP shall have furnished 
     
<PAGE>
                                      -26-
     
     to the Representatives a letter, dated the date of this Agreement, 
     in form and substance satisfactory to the Representatives, to the 
     effect that:

      (i)      they are independent public accountants with respect to 
     PSCo and its subsidiaries within the meaning of the Act and 
     the applicable published rules and regulations thereunder (the 
     "Act Regulations");
     
      (ii)     in their opinion, the audited consolidated financial 
     statements and financial statement schedule(s) incorporated by 
     reference in the Registration Statement and the Prospectus and 
     included in the Form 10-K comply as to form in all material 
     respects with the applicable accounting requirements of the 
     Act, the Act Regulations, the Exchange Act and the applicable 
     published rules and regulations thereunder (the "Exchange Act 
     Regulations");
     
      (iii)    on the basis of (1) the performance of the 
     procedures specified by the American Institute of Certified 
     Public Accountants for a review of interim financial 
     information as described in Statement on Auditing Standards 
     No. 71, Interim Financial Information, on the unaudited 
     consolidated balance sheets, the unaudited consolidated 
     statements of income and retained earnings, and the unaudited 
     consolidated statements of cash flows, of PSCo and its 
     subsidiaries included in PSCo's quarterly reports on Form 10-Q 
     filed with the Commission under Section 13 of the Exchange Act 
     (the "Form 10-Q's") subsequent to the Form 10-K, (2) a reading 
     of the latest available unaudited financial statements of 
     PSCo, (3) a reading of the minutes of the Annual Meeting of 
     Shareholders and the latest minutes of Meetings of the Board 
     of Directors of PSCo as set forth in the minute books for the 
     current year and certain draft resolutions for subsequent 
     meetings and (4) inquiries of the officers of PSCo who have 
     responsibility for financial and accounting matters (it being 
     understood that the foregoing procedures do not constitute an 
     audit made in accordance with generally accepted auditing 
     standards and would not necessarily reveal matters of 
     significance with respect to the comments made in such letter, 
     and accordingly that Arthur Andersen LLP makes no 
     representation as to the sufficiency of such procedures for 
     the purposes of the several Underwriters), nothing has come to 
     their attention which 

<PAGE>
                                      -27-

     caused them to believe that (A) any material modifications should 
     be made to the unaudited consolidated financial statements included 
     in the Form 10-Q's for them to be in conformity with generally 
     accepted accounting principles; (B) the unaudited consolidated 
     financial statements included in the Form 10-Q's do not comply as 
     to form in all material respects with the applicable accounting 
     requirements of the Exchange Act as they apply to Form 10-Q and 
     Exchange Act Regulations or (C) at the date of the latest available 
     consolidated financial statements and at a specified date not more 
     than three business days prior to the date of such letter, there 
     was any change in the consolidated capital stock or increase in the 
     consolidated long-term debt of PSCo or any decrease in the 
     consolidated net assets or shareholders' equity of PSCo, in each 
     case as compared with the amounts shown on the most recent 
     consolidated balance sheet of PSCo incorporated by reference in the 
     Registration Statement and the Prospectus or, during the period 
     from the date of such balance sheet to a specified date not more 
     than three business days prior to the date of such letter, upon 
     inquiries of the appropriate officers of PSCo, there were any 
     decreases, as compared with the corresponding period in the 
     preceding year, in consolidated operating revenues or consolidated 
     net income of PSCo, except in each such case as set forth in or 
     contemplated by the Registration Statement and the Prospectus or 
     except for such exceptions enumerated in such letter as shall have 
     been agreed to by the Representatives and PSCo; and
     
      (iv)     In addition to the audits referred to in their report 
     appearing in the Form 10-K incorporated by reference in the 
     Registration Statement and the Prospectus, and the limited 
     procedures referred to in clause (iii) above, they have carried out 
     certain other specified procedures, not constituting an audit, with 
     respect to certain amounts, percentages and financial information 
     which are included or incorporated by reference in the Registration 
     Statement and the Prospectus and which are specified by the 
     Representatives, and have found such amounts, percentages and 
     financial information to be in agreement with the relevant 
     accounting, financial and other records of PSCo and its 
     subsidiaries identified in such letter, provided that said letter 
     may vary from the 

<PAGE>

                                      -28-

     requirements specified above in such manner as you may deem not to 
     be material or as may be acceptable to the Representatives with the 
     consent of Underwriters who have agreed to purchase in the 
     aggregate 50% or more of the Preferred Securities.

          (h)  BRING-DOWN COMFORT LETTER.  At the Time of Delivery, the 
     Representatives shall have received from Arthur Andersen LLP a 
     letter, dated as of the Time of Delivery, to the effect that they 
     reaffirm the statements made in the letter furnished pursuant to 
     subsection (g) of this Section, except that the specified date 
     referred to shall be a date not more than three business days prior 
     to the Time of Delivery.
     
          (i)  MAINTENANCE OF RATING.  At the Time of Delivery, the 
     Preferred Securities shall be rated at least Baa1 by Moody's 
     Investor's Service ("Moody's") and BBB+ by Standard & Poor's 
     Ratings Group ("S&P"), a division of McGraw-Hill, Inc., and PSCo 
     shall have delivered to the Representatives a letter dated the Time 
     of Delivery, from each such rating agency, or other evidence 
     satisfactory to the Representatives, confirming that the Preferred 
     Securities have such ratings; and since the date of this Agreement, 
     there shall not have occurred a downgrading in the rating assigned 
     to the Preferred Securities or any of PSCo's other securities by 
     S&P or Moody's, and neither S&P nor Moody's shall have publicly 
     announced that it has under surveillance or review its rating of 
     the Preferred Securities or any of PSCo's other securities, other 
     than any downgrading in the rating assigned to any or all series of 
     PSCo's outstanding preferred stock by Moody's from Baa1 to Baa2.
     
          (j)  EXECUTION OF AGREEMENTS.  The Declaration, the Guarantee 
     and the Indenture shall have been executed and delivered, in each 
     case in a form reasonably satisfactory to the Representatives.
     
          (k)  APPROVAL OF LISTING.  The Preferred Securities shall have 
     been duly listed, subject to official notice of issuance, on the 
     New York Stock Exchange.
     
          (l)  ADDITIONAL DOCUMENTS.  At the Time of Delivery, counsel 
     for the Underwriters shall have been furnished with such documents 
     and opinions as they may require for the purpose of enabling them 
     to pass upon the issuance and sale of the Preferred Securities as 
     herein contemplated, 
     
<PAGE>
                                      -29-

     or in order to evidence the accuracy of any of the representations 
     or warranties, or the fulfillment of any of the conditions, herein 
     contained; and all proceedings taken by PSCo in connection with the 
     issuance and sale of the Preferred Securities as herein 
     contemplated shall be satisfactory in form and substance to the 
     Representatives and counsel for the Underwriters.
     
          (m)  TERMINATION OF AGREEMENT.  If any condition specified in 
     this Section shall not have been fulfilled when and as required to 
     be fulfilled, this Agreement may be terminated by the 
     Representatives by notice to PSCo at any time at or prior to the 
     Time of Delivery, and such termination shall be without liability 
     of any party to any other party except as provided in Section 4 and 
     except that Sections 1, 6, 7 and 8 shall survive any such 
     termination and remain in full force and effect.

          SECTION 6.   INDEMNIFICATION AND CONTRIBUTION.

                    (a)  INDEMNIFICATION OF UNDERWRITERS.  The Trust and 
PSCo, jointly and severally, agree to indemnify and hold harmless each 
Underwriter and each person, if any, who controls any Underwriter within the 
meaning of Section 15 of the Act or Section 20 of the 1934 Act, as follows:

      (i)      against any and all loss, liability, claim, damage and 
     expense whatsoever, as incurred, arising out of any untrue 
     statement or alleged untrue statement of a material fact contained 
     in the Registration Statement (or any amendment thereto), or the 
     omission or alleged omission therefrom of a material fact required 
     to be stated therein or necessary to make the statements therein 
     not misleading or arising out of any untrue statement or alleged 
     untrue statement of a material fact contained in any Preliminary 
     Prospectus or the Prospectus (or any amendment or supplement 
     thereto) or the omission or alleged omission therefrom of a 
     material fact necessary in order to make the statements therein, in 
     the light of the circumstances under which they were made, not 
     misleading; 
     
      (ii)     against any and all loss, liability, claim, damage and 
     expense whatsoever, as incurred, to the extent of the aggregate 
     amount paid in settlement of any litigation, or any investigation 
     or proceeding by any governmental agency or body, commenced or 
     threatened, or of any claim whatsoever based upon any such untrue 
     statement or omission or any alleged untrue statement or omission, 
     if such 

<PAGE>
                                      -30-

     settlement is effected with the written consent of the Trust and PSCo; and
     
      (iii)    against any and all expense whatsoever, as incurred 
     (including the fees and disbursements of counsel chosen by Merrill 
     Lynch), reasonably incurred in investigating, preparing or 
     defending against any litigation, or any investigation or 
     proceeding by any governmental agency or body commenced or 
     threatened, or any claim whatsoever based upon any such untrue 
     statement or omission, or any such alleged untrue statement or 
     omission, to the extent that any such expense is not paid under (i) 
     or (ii) above;
     
PROVIDED, HOWEVER, that this indemnity agreement shall not apply to any loss, 
liability, claim, damage or expense to the extent arising out of any untrue 
statement or omission or alleged untrue statement or omission made in 
reliance upon and in conformity with written information furnished to PSCo by 
any Underwriter through Merrill Lynch expressly for use in the Registration 
Statement (or any amendment thereto) or the Prospectus (or any amendment or 
supplement thereto).

                    The Trust and PSCo shall not be liable for indemnity 
under this Section 6(a) with respect to any Preliminary Prospectus to the 
extent that any such loss, claim, damage or liability of such Underwriter 
results solely from the fact that such Underwriter sold Preferred Securities 
to a person to whom it is established that there was not sent or given, at or 
prior to the written confirmation of such sale, a copy of the Prospectus 
(excluding documents incorporated by reference) in any case where such 
delivery is required by the Act, if the Trust and PSCo has previously 
furnished to the Underwriters the copies thereof in compliance with this 
Agreement, and the loss, claim, damage or liability of such Underwriter 
results from an untrue statement or omission of a material fact contained in 
the Preliminary Prospectus that was corrected in the Prospectus.

                    (b)  INDEMNIFICATION OF COMPANY, DIRECTORS AND OFFICERS.  
Each Underwriter severally agrees that it will indemnify and hold harmless 
the Trust and PSCo, their directors, and each of their officers who signed 
the Registration Statement and each person, if any, who controls them within 
the meaning of Section 15 of the Act or Section 20 of the 1934 Act to the 
same extent as the indemnity agreement set forth in Section 6(a) hereof, but 
only with respect to statements or omissions made in the Registration 
Statement, any Preliminary Prospectus or the Prospectus, or any amendment or 
supplement thereto, in re-

<PAGE>
                                      -31-

liance upon and in conformity with written information furnished to the Trust 
or PSCo by such Underwriter through Merrill Lynch expressly for use in the 
Registration Statement, such Preliminary Prospectus, or the Prospectus, or 
any amendment or supplement thereto.

                    (c)  ACTION AGAINST PARTIES; NOTIFICATION.  Each 
indemnified party shall give notice as promptly as reasonably practicable to 
each indemnifying party of any action commenced against it in respect of 
which indemnity may be sought hereunder, but failure to so notify an 
indemnifying party shall not relieve such indemnifying party from any 
liability hereunder to the extent it is not materially prejudiced as a result 
thereof and in any event shall not relieve it from any liability which it may 
have otherwise than on account of this indemnity agreement.  In the case of 
parties indemnified pursuant to Section 6(a) above, counsel to the 
indemnified parties shall be selected by Merrill Lynch, and, in the case of 
parties indemnified pursuant to Section 6(b) above, counsel to the 
indemnified parties shall be selected by PSCo, in each case reasonably 
acceptable to the indemnifying party.  An indemnifying party may participate 
at its own expense in the defense of any such action; provided, however, that 
counsel to the indemnifying party shall not (except with the consent of the 
indemnified party) also be counsel to the indemnified party.  In no event 
shall the indemnifying parties be liable for fees and expenses of more than 
one counsel (in addition to any local counsel) separate from their own 
counsel for all indemnified parties in connection with any one action or 
separate but similar or related actions in the same jurisdiction arising out 
of the same general allegations or circumstances.  No indemnifying party 
shall, without the prior written consent of the indemnified parties, settle 
or compromise or consent to the entry of any judgment with respect to any 
litigation, or any investigation or proceeding by any governmental agency or 
body, commenced or threatened, or any claim whatsoever in respect of which 
indemnification or contribution could be sought under this Section 6 hereof 
(whether or not the indemnified parties are actual or potential parties 
thereto), unless such settlement, compromise or consent (i) includes an 
unconditional release of each indemnified party from all liability arising 
out of such litigation, investigation, proceeding or claim and (ii) does not 
include a statement as to or an admission of fault, culpability or a failure 
to act by or on behalf of any indemnified party.

                    (d)  SETTLEMENT WITHOUT CONSENT IF FAILURE TO REIMBURSE.  
If at any time an indemnified party shall have requested an indemnifying 
party to reimburse the indemnified 

<PAGE>
                                     -32-

party for fees and expenses of counsel, such indemnifying party agrees that 
it shall be liable for any settlement of the nature contemplated by Section 
6(a)(ii) effected without its written consent if (i) such settlement is 
entered into more than 45 days after receipt by such indemnifying party of 
the aforesaid request, (ii) such indemnifying party shall have received 
notice of the terms of such settlement at least 30 days prior to such 
settlement being entered into and (iii) such indemnifying party shall not 
have reimbursed such indemnified party in accordance with such request prior 
to the date of such settlement.

          SECTION 7.     CONTRIBUTION.  If the indemnification provided for 
in Section 6 hereof is for any reason unavailable to or insufficient to hold 
harmless an indemnified party in respect of any losses, liabilities, claims, 
damages or expenses referred to therein; then each indemnifying party shall 
contribute to the aggregate amount of such losses, liabilities, claims, 
damages and expenses incurred by such indemnified party, as incurred, (i) in 
such proportion as is appropriate to reflect the relative benefits received 
by PSCo and the Trust on the one hand and the Underwriters on the other hand 
from the offering of the Preferred Securities pursuant to this Agreement or 
(ii) if the allocation provided by clause (i) is not permitted by applicable 
law, in such proportion as is appropriate to reflect not only the relative 
benefits referred to in clause (i) above but also the relative fault of PSCo 
and the Trust on the one hand and of the Underwriters on the other hand in 
connection with the statements or omissions, which resulted in such losses, 
liabilities, claims, damages or expenses, as well as any other relevant 
equitable considerations.

                    The relative benefits received by PSCo and the Trust on 
the one hand and the Underwriters on the other hand in connection with the 
offering of the Preferred Securities pursuant to this Agreement shall be 
deemed to be in the same respective proportions as the total net proceeds 
from the offering of the Preferred Securities pursuant to this Agreement 
(before deducting expenses) received by PSCo and the total underwriting 
discount received by the Underwriters, in each case as set forth on the cover 
of the Prospectus, bear to the aggregate initial public offering price of the 
Preferred Securities as set forth on such cover.

                    The relative fault of PSCo and the Trust on the one hand 
and the Underwriters on the other hand shall be determined by reference to, 
among other things, whether any such untrue or alleged untrue statement of a 
material fact or omission or al-

<PAGE>
                                     -33-

leged omission to state a material fact relates to information supplied by 
PSCo or by the Underwriters and the parties' relative intent, knowledge, 
access to information and opportunity to correct or prevent such statement or 
omission.

                    PSCo, the Trust and the Underwriters agree that it would 
not be just and equitable if contribution pursuant to this Section 7 were 
determined by pro rata allocation (even if the Underwriters were treated as 
one entity for such purpose) or by any other method of allocation which does 
not take account of the equitable considerations referred to above in this 
Section 7.  The aggregate amount of losses, liabilities, claims, damages and 
expenses incurred by an indemnified party and referred to above in this 
Section 7 shall be deemed to include any legal or other expenses reasonably 
incurred by such indemnified party in investigating, preparing or defending 
against any litigation, or any investigation or proceeding by any 
governmental agency or body, commenced or threatened, or any claim whatsoever 
based upon any such untrue or alleged untrue statement or omission or alleged 
omission.

                    Notwithstanding the provisions of this Section 7, no 
Underwriter shall be required to contribute any amount in excess of the 
amount by which the total price at which the Preferred Securities 
underwritten by it and distributed to the public were offered to the public 
exceeds the amount of any damages which such Underwriter has otherwise been 
required to pay by reason of any such untrue or alleged untrue statement or 
omission or alleged omission.

                    No person guilty of fraudulent misrepresentation (within 
the meaning of Section 11(f) of the 1933 Act) shall be entitled to 
contribution from any person who was not guilty of such fraudulent 
misrepresentation.

                    For purposes of this Section 7, each person, if any, who 
controls an Underwriter within the meaning of Section 15 of the 1933 Act or 
Section 20 of the 1934 Act shall have the same rights to contribution as such 
Underwriter, and each director of PSCo, each officer of PSCo and the Trustee 
of the Trust who signed the Registration Statement, and each person, if any, 
who controls the Company or the Trust within the meaning of Section 15 of the 
1933 Act or Section 20 of the 1934 Act shall have the same rights to 
contribution as PSCo. The Underwriters' respective obligations to contribute 
pursuant to this Section 7 are several in proportion to the number of 
Preferred Securities set forth opposite their respective names in Schedule A 
hereto and not joint.

<PAGE>
                                      -34-

          SECTION 8.     REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO 
SURVIVE DELIVERY.  All representations, warranties and agreements contained 
in this Agreement or in certificates of officers of PSCo submitted pursuant 
hereto shall remain operative and in full force and effect, regardless of any 
investigation made by or on behalf of any Underwriter or controlling person, 
or by or on behalf of PSCo, and shall survive delivery of the Preferred 
Securities to the Underwriters.

          SECTION 9.     TERMINATION OF AGREEMENT.

                    (a)  TERMINATION; GENERAL.  The Representatives may 
terminate this Agreement, by notice to PSCo, at any time at or prior to the 
Time of Delivery, (i) if there has been, since the time of execution of this 
Agreement or since the respective dates as of which information is given in 
the Prospectus, any material adverse change in the business, property or 
condition, financial or otherwise, of PSCo and its subsidiaries, considered 
as one enterprise, whether or not arising in the ordinary course of business, 
or (ii) if there has occurred any material adverse change in the financial 
markets in the United States, any outbreak of hostilities or escalation 
thereof or other calamity or crisis or any change or development involving a 
prospective change in national or international political, financial or 
economic conditions, in each case the effect of which is such as to make it, 
in the judgment of the Representatives, impracticable to market the Preferred 
Securities or to enforce contracts for the sale of the Preferred Securities, 
or (iii) if trading in any securities of PSCo has been suspended or 
materially limited by the Commission or the New York Stock Exchange, or if 
trading generally on the New York Stock Exchange has been suspended or 
materially limited, or minimum or maximum prices for trading have been fixed, 
or maximum ranges for prices have been required, by such exchange or by order 
of the Commission, or any other governmental authority, or (iv) if a banking 
moratorium has been declared by either Federal or New York authorities.

                    (b)  LIABILITIES.  If this Agreement is terminated 
pursuant to this Section, such termination shall be without liability of any 
party to any other party except as provided in Section 4 hereof, and provided 
further that Sections 1, 6, 7 and 8 shall survive such termination and remain 
in full force and effect.

          SECTION 10.    DEFAULT BY ONE OR MORE OF THE UNDERWRITERS.  If any 
Underwriter or Underwriters shall fail or refuse at the Time of Delivery 
(otherwise than for some reason suffi-

<PAGE>

cient to justify, in accordance with the provisions hereof, the cancellation 
or termination of its or their obligations hereunder) to purchase and pay for 
the Preferred Securities which it or they have agreed to purchase as provided 
in paragraph 4 hereof (the "Defaulted Securities"), and:

          (a)  if the aggregate principal amount of the Defaulted 
     Securities does not exceed 10% of the aggregate principal amount of 
     the Preferred Securities, the remaining Underwriters (the 
     "Non-Defaulting Underwriters") shall have the right, within a 
     period of 24 hours thereafter, to make arrangements for one or more 
     of the Non-Defaulting Underwriters, or any other purchasers 
     acceptable to PSCo, to purchase all, but not less than all, of the 
     Defaulted Securities in such principal amounts as may be agreed 
     upon and upon the terms herein set forth; if, however, during such 
     24 hour period the Non-Defaulting Underwriters shall not have 
     completed such arrangements for the purchase of all the Defaulted 
     Securities, then the Non-Defaulting Underwriters shall be obligated 
     to purchase and pay for the Defaulted Securities in proportion to 
     their respective original purchase commitments hereunder (based 
     upon the ratio that each of their respective original purchase 
     commitments bears to the aggregate original purchase commitment of 
     the Non-Defaulting Underwriters); or
     
          (b)  if the aggregate principal amount of the Defaulted 
     Securities exceeds 10% of the aggregate principal amount of the 
     Preferred Securities, the Non-Defaulting Underwriters shall have 
     the right, within a period of 24 hours thereafter, to make 
     arrangements for one or more of the Non-Defaulting Underwriters, or 
     any other purchasers acceptable to PSCo, to purchase the Defaulted 
     Securities in such principal amounts as may be agreed upon and upon 
     the terms herein set forth; if, however, during such 24 hour period 
     the Non-Defaulting Underwriters shall not have completed such 
     arrangements for the purchase of all the Defaulted Securities, then 
     PSCo may, within a further period of 24 hours, make arrangements 
     with one or more other members of the National Association of 
     Securities Dealers, Inc., satisfactory to the Non-Defaulting 
     Underwriters, to purchase and pay for, upon the terms herein set 
     forth, Defaulted Securities for the purchase of which no 
     arrangements shall have been made by the Non-Defaulting 
     Underwriters.  In the event that neither the Non-Defaulting 
     Underwriters nor PSCo has arranged for the purchase of the 
     Defaulted Securities as above provided, then this Agreement shall 
     terminate.

<PAGE>
                                      -36-

                    No action taken by PSCo or the Non-Defaulting 
Underwriters under this Section 9 shall relieve any defaulting Underwriter of 
liability in respect of its default hereunder.

                    In the event that the sale and delivery of all or any 
principal amount of the Preferred Securities shall be effected as provided in 
clause (a) or (b) above, (a) either PSCo or the Representatives shall have 
the right to postpone the Time of Delivery until the fifth business day after 
the Time of Delivery originally specified in Section 2 hereof or such other 
time as PSCo and the Representatives (or the representative of the 
Non-Defaulting Underwriters and the substituted purchasers, if any, if the 
Representatives shall be in default) shall agree, (b) PSCo shall promptly 
prepare and file with the Commission any amendments or supplements to the 
Prospectus which may thereby be made necessary and (c) the respective 
principal amounts of Preferred Securities to be purchased by the 
Non-Defaulting Underwriters or substituted purchasers shall be taken as the 
basis of their respective purchase commitments hereunder.

          SECTION 11.    NOTICES.  All notices and other communications 
hereunder shall be in writing and shall be deemed to have been duly given if 
mailed or transmitted by any standard form of telecommunication.  Notices to 
the Underwriters shall be directed to the Representatives c/o Merrill Lynch 
at North Tower, World Financial Center, New York, New York 10281-1201, 
attention of: Robert Craig) (telecopy number: 212-449-8636); and notices to 
PSCo or the Trust shall be directed to it at 1225 17th Street, Suite 900, 
Denver, Colorado 80507-5533, Attention:  Brian P. Jackson (telecopy number: 
303-294-2976).

          SECTION 12.    PARTIES.  This Agreement shall each inure to the 
benefit of and be binding upon the Underwriters and PSCo and their respective 
successors.  Nothing expressed or mentioned in this Agreement is intended or 
shall be construed to give any person, firm or corporation, other than the 
Underwriters and PSCo and their respective successors and the controlling 
persons and officers and directors referred to in Sections 6 and 7 and their 
heirs and legal representatives, any legal or equitable right, remedy or 
claim under or in respect of this Agreement or any provision herein 
contained.  This Agreement and all conditions and provisions hereof are 
intended to be for the sole and exclusive benefit of the Underwriters and 
PSCo and their respective successors, and said controlling persons and 
officers and directors and their heirs and legal representatives, and for the 
benefit of no other person, firm or corporation. No purchaser of Preferred 
Securities from any 

<PAGE>
                                      -37-

Underwriter shall be deemed to be a successor by reason merely of such 
purchase.

          SECTION 13.    GOVERNING LAW AND TIME.  THIS AGREEMENT SHALL BE 
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW 
YORK. SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

          SECTION 14.    EFFECT OF HEADINGS.  The Article and Section 
headings herein are for convenience only and shall not affect the 
construction hereof.

<PAGE>
                                      -38-

                    If the foregoing is in accordance with your understanding 
of our agreement, please sign and return to PSCo a counterpart hereof, 
whereupon this instrument, along with all counterparts, will become a binding 
agreement between the Underwriters and PSCo in accordance with its terms.

                                   Very truly yours,

                                   PSCO CAPITAL TRUST I

                                   By: Public Service Company
                                       of Colorado, as Depositor

                                   By: /s/ N.E. Felker
                                       ---------------------------------
                                       Name:
                                       Title: 

                                   PUBLIC SERVICE COMPANY OF COLORADO

                                   By: /s/ James D. Steinhilper
                                       ---------------------------------
                                       Name: James D. Steinhilper
                                       Title: Treasurer and Director of Finance

CONFIRMED AND ACCEPTED,
as of the date first above written:

MERRILL LYNCH & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
               INCORPORATED
A.G. EDWARDS & SONS, INC.
MORGAN STANLEY & CO. INCORPORATED
PAINEWEBBER INCORPORATED

By: MERRILL LYNCH, PIERCE, FENNER & SMITH
            INCORPORATED

By            /s/ Roger Craig
   ---------------------------------------
            Authorized Signatory

For itself and as Representatives of the other Underwriters named in Schedule 
A hereto.

<PAGE>

                                     SCHEDULE I

<TABLE>
<CAPTION>
                                                            Total Number of
          Name of Underwriter                         Securities to Be Purchased
          -------------------                         --------------------------
 <S>                                                  <C>
 Merrill Lynch, Pierce, Fenner
   & Smith Incorporated.................                              1,365,000
 A.G. Edwards & Sons Inc. ..............                              1,365,000
 Morgan Stanley & Co. 
   Incorporated.........................                              1,365,000
 PaineWebber Incorporated...............                              1,365,000
 Advest, Inc. ..........................                                100,000
 BT Alex. Brown Incorporated............                                100,000
 Robert W. Baird & Co.
   Incorporated.........................                                100,000
 Bear, Stearns & Co. Inc. ..............                                100,000
 J.C. Bradford & Co. ...................                                100,000
 CIBC Oppenheimer Corp. ................                                100,000
 Cowen & Company........................                                100,000
 Dain Rauscher Wessels..................                                100,000
 Donaldson, Lufkin & Jenrette 
   Securities Corporation...............                                100,000
 EVEREN Securities, Inc. ...............                                100,000
 Fahnestock & Co. Inc. .................                                100,000
 Legg Mason Wood Walker,
   Incorporated.........................                                100,000
 McDonald & Company Securities, Inc. ...                                100,000
 Morgan Keegan & Company,
   Inc. ................................                                100,000
 Olde & Co., Incorporated...............                                100,000
 Piper Jaffray Inc. ....................                                100,000
 Raymond James & Associates, 
   Inc. ................................                                100,000
 The Robinson-Humphrey Company,
   LLC..................................                                100,000
 Stifel, Nicolaus & Company,
   Incorporated.........................                                100,000
 Stone & Youngberg......................                                100,000
 TD Securities (USA) Inc. ..............                                100,000
 Tucker Anthony Incorporated............                                100,000
 Wheat First Securities,
   Inc. ................................                                100,000
                                                                      ---------
       Total............................                              7,760,000
                                                                      ---------
                                                                      ---------
</TABLE>

<PAGE>





                              AMENDED AND RESTATED
                 DECLARATION OF TRUST FOR PSCO CAPITAL TRUST I
                                      among

                       PUBLIC SERVICE COMPANY OF COLORADO
                                 (as Depositor)

                              THE BANK OF NEW YORK
                              (as Property Trustee)

                         THE BANK OF NEW YORK (DELAWARE)
                              (as Delaware Trustee)

                                       and

                    THE ADMINISTRATIVE TRUSTEE NAMED HEREIN



                            Dated as of May 11, 1998

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                           <C>
ARTICLE I

     Defined Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
     Section 1.01.  Definitions. . . . . . . . . . . . . . . . . . . . . . . . 1

ARTICLE II

     Continuation of the Trust . . . . . . . . . . . . . . . . . . . . . . . . 8
     Section 2.01.  Name . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     Section 2.02.  Office of the Delaware Trustee; Principal Place of
                     Business. . . . . . . . . . . . . . . . . . . . . . . . . 8
     Section 2.03.  Initial Contribution of Trust Property; Expenses of
                     the Trust . . . . . . . . . . . . . . . . . . . . . . . . 9
     Section 2.04.  Issuance of the Trust Securities . . . . . . . . . . . . .10
     Section 2.05.  Purchase of Debentures . . . . . . . . . . . . . . . . . .10
     Section 2.06.  Declaration. . . . . . . . . . . . . . . . . . . . . . . .10
     Section 2.07.  Authorization to Enter into Certain Transactions . . . . .11
     Section 2.08.  Assets of Trust. . . . . . . . . . . . . . . . . . . . . .15
     Section 2.09.  Title to Trust Property. . . . . . . . . . . . . . . . . .15

ARTICLE III

     Payment Account . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
     Section 3.01.  Payment Account. . . . . . . . . . . . . . . . . . . . . .15

ARTICLE IV

     Distributions; Redemption . . . . . . . . . . . . . . . . . . . . . . . .16
     Section 4.01.  Distributions. . . . . . . . . . . . . . . . . . . . . . .16
     Section 4.02.  Redemption . . . . . . . . . . . . . . . . . . . . . . . .17
     Section 4.03.  Subordination of Common Securities . . . . . . . . . . . .18
     Section 4.04.  Payment Procedures . . . . . . . . . . . . . . . . . . . .19
     Section 4.05.  Tax Returns and Reports. . . . . . . . . . . . . . . . . .19
     Section 4.06.  Payments under Indenture . . . . . . . . . . . . . . . . .19

ARTICLE V

     Trust Securities Certificates . . . . . . . . . . . . . . . . . . . . . .20
     Section 5.01.  Initial Ownership. . . . . . . . . . . . . . . . . . . . .20
     Section 5.02.  The Trust Securities Certificates. . . . . . . . . . . . .20
     Section 5.03.  Delivery of Trust Securities Certificates. . . . . . . . .20
     Section 5.04.  Registration of Transfer and Exchange of Preferred
                     Securities Certificates . . . . . . . . . . . . . . . . .20


                                       -i-
<PAGE>

     Section 5.05.  Mutilated, Destroyed, Lost or Stolen Trust Securities
                     Certificates. . . . . . . . . . . . . . . . . . . . . . .21
     Section 5.06.  Persons Deemed Securityholders . . . . . . . . . . . . . .21
     Section 5.07.  Access to List of Securityholders' Names and Addresses . .22
     Section 5.08.  Maintenance of Office or Agency. . . . . . . . . . . . . .22
     Section 5.09.  Appointment of Paying Agent. . . . . . . . . . . . . . . .22
     Section 5.10.  Transfer of Securities . . . . . . . . . . . . . . . . . .23
     Section 5.11.  Book-Entry Preferred Securities Certificates; Common
                     Securities Certificate. . . . . . . . . . . . . . . . . .23
     Section 5.12.  Definitive Preferred Securities Certificates . . . . . . .23
     Section 5.13.  Rights of Securityholders. . . . . . . . . . . . . . . . .24

ARTICLE VI

     Acts of Securityholders; Meetings; Voting . . . . . . . . . . . . . . . .24
     Section 6.01.  Limitations on Voting Rights . . . . . . . . . . . . . . .24
     Section 6.02.  Notice of Meetings . . . . . . . . . . . . . . . . . . . .25
     Section 6.03.  Meetings of Preferred Securityholders. . . . . . . . . . .25
     Section 6.04.  Voting Rights. . . . . . . . . . . . . . . . . . . . . . .26
     Section 6.05.  Proxies, etc . . . . . . . . . . . . . . . . . . . . . . .26
     Section 6.06.  Securityholder Action by Written Consent . . . . . . . . .26
     Section 6.07.  Record Date for Voting and Other Purposes. . . . . . . . .26
     Section 6.08.  Acts of Securityholders. . . . . . . . . . . . . . . . . .26
     Section 6.09.  Inspection of Records. . . . . . . . . . . . . . . . . . .27

ARTICLE VII

     The Trustees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
     Section 7.01.  Certain Duties and Responsibilities. . . . . . . . . . . .27
     Section 7.02.  Notice of Defaults; Direct Action by Securityholders . . .28
     Section 7.03.  Certain Rights of Property Trustee . . . . . . . . . . . .29
     Section 7.04.  Not Responsible for Recitals or Issuance of Securities . .30
     Section 7.05.  May Hold Securities. . . . . . . . . . . . . . . . . . . .30
     Section 7.06.  Compensation; Indemnity; Fees. . . . . . . . . . . . . . .30
     Section 7.07.  Corporate Property Trustee Required; Eligibility of
                     Trustees. . . . . . . . . . . . . . . . . . . . . . . . .32
     Section 7.08.  Conflicting Interests. . . . . . . . . . . . . . . . . . .33
     Section 7.09.  Co-Trustees and Separate Trustee . . . . . . . . . . . . .33
     Section 7.10.  Resignation and Removal; Appointment of Successor. . . . .34
     Section 7.11.  Acceptance of Appointment by Successor . . . . . . . . . .36
     Section 7.12.  Merger, Conversion, Consolidation or Succession to
                     Business. . . . . . . . . . . . . . . . . . . . . . . . .36
     Section 7.13.  Preferential Collection of Claims Against Depositor or
                     Trust . . . . . . . . . . . . . . . . . . . . . . . . . .36
     Section 7.14.  Reports by Property Trustee. . . . . . . . . . . . . . . .37
     Section 7.15.  Reports to the Property Trustee. . . . . . . . . . . . . .37
     Section 7.16.  Evidence of Compliance with Conditions Precedent . . . . .37


                                      -ii-
<PAGE>

     Section 7.17.  Statements Required in Officers' Certificate and
                     Opinion of Counsel. . . . . . . . . . . . . . . . . . . .37
     Section 7.18.  Number of Trustees . . . . . . . . . . . . . . . . . . . .38
     Section 7.19.  Delegation of Power. . . . . . . . . . . . . . . . . . . .38
     Section 7.20.  Voting . . . . . . . . . . . . . . . . . . . . . . . . . .38

ARTICLE VIII

     Dissolution and Liquidation . . . . . . . . . . . . . . . . . . . . . . .39
     Section 8.01.  Dissolution Upon Expiration Date . . . . . . . . . . . . .39
     Section 8.02.  Early Dissolution. . . . . . . . . . . . . . . . . . . . .39
     Section 8.03.  Dissolution. . . . . . . . . . . . . . . . . . . . . . . .39
     Section 8.04.  Liquidation. . . . . . . . . . . . . . . . . . . . . . . .39

ARTICLE IX

     Mergers, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
     Section 9.01.  Mergers, Consolidations, Amalgamations or Replacements
                     of the Trust. . . . . . . . . . . . . . . . . . . . . . .41

ARTICLE X

     Miscellaneous Provisions. . . . . . . . . . . . . . . . . . . . . . . . .42
     Section 10.01.  Limitation of Rights of Securityholders . . . . . . . . .42
     Section 10.02.  Amendment . . . . . . . . . . . . . . . . . . . . . . . .42
     Section 10.03.  Severability. . . . . . . . . . . . . . . . . . . . . . .43
     Section 10.04.  Fiscal Year . . . . . . . . . . . . . . . . . . . . . . .43
     Section 10.05.  Certain Accounting Matters. . . . . . . . . . . . . . . .43
     Section 10.06.  Governing Law . . . . . . . . . . . . . . . . . . . . . .43
     Section 10.07.  Payments Due on Non-Business Day. . . . . . . . . . . . .44
     Section 10.08.  Successors and Assigns. . . . . . . . . . . . . . . . . .44
     Section 10.09.  Headings. . . . . . . . . . . . . . . . . . . . . . . . .44
     Section 10.10.  Reports, Notices and Demands. . . . . . . . . . . . . . .44
     Section 10.11.  Agreement Not to Petition . . . . . . . . . . . . . . . .45
     Section 10.12.  Trust Indenture Act; Conflict with Trust Indenture Act. .45
     Section 10.13.  Acceptance of Terms of Declaration, Guarantee and
                     Indenture . . . . . . . . . . . . . . . . . . . . . . . .45

ARTICLE XI

     Representations of Property Trustee and Delaware Trustee. . . . . . . . .46
     Section 11.01.  Representations and Warranties of Property Trustee. . . .46
     Section 11.02.  Representations and Warranties of Delaware Trustee. . . .46
</TABLE>

                                      -iii-
<PAGE>

                              PSCO Capital Trust I

           Certain Sections of this Declaration of Trust relating to
                         Sections 310 through 318 of the

                           Trust Indenture Act of 1939

<TABLE>
<CAPTION>
Trust Indenture                                             Declaration of Trust
  Act Section                                                     Section
  -----------                                                     -------
<S>                                                                       <C>
Sections 310 (a)(1). . . . . . . . . . . . . . . . . . . . . . . . . . .   7.07
             (a)(2). . . . . . . . . . . . . . . . . . . . . . . . . . .   7.07
             (a)(3). . . . . . . . . . . . . . . . . . . . . . . . . . .   7.09
             (a)(4). . . . . . . . . . . . . . . . . . . . . . . .  2.07(a)(ii)
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7.08
Sections 311 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.13
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.13
Sections 312 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.07
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.07
             (c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.07
Sections 313 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.14
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.14
             (c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.14
             (d) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.14
Sections 314 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7.15
             (b) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (c)(1). . . . . . . . . . . . . . . . . . . . . . . .   7.16, 7.17
             (c)(2). . . . . . . . . . . . . . . . . . . . . . . .   7.16, 7.17
             (c)(3). . . . . . . . . . . . . . . . . . . . . . . Not Applicable
             (d) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.17
Sections 315 (a) . . . . . . . . . . . . . . . . . . . . . .   7.01(a), 7.03(a)
             (b) . . . . . . . . . . . . . . . . . . . . . . . . .  7.02, 10.08
             (c) . . . . . . . . . . . . . . . . . . . . . . . . . . .  7.01(a)
             (d) . . . . . . . . . . . . . . . . . . . . . . . . .   7.01, 7.03
             (e) . . . . . . . . . . . . . . . . . . . . . . . . Not Applicable
Sections 316 (a) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (a)(1)(A) . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (a)(1)(B) . . . . . . . . . . . . . . . . . . . . . Not Applicable
             (a)(2). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (b) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (c) . . . . . . . . . . . . . . . . . . . . . . . . Not Applicable


                                      -iv-
<PAGE>

Sections 317 (a)(1). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
             (a)(2). . . . . . . . . . . . . . . . . . . . . . . Not Applicable
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.09
Sections 318 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.10
</TABLE>

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

Note:  This reconciliation and tie sheet shall not, for any purpose, be deemed
       to be a part of the Declaration of Trust.


                                       -v-
<PAGE>

     AMENDED AND RESTATED DECLARATION of PSCO Capital Trust I (the "Trust"),
dated as of May 11, 1998 among (i) Public Service Company of Colorado, a
Colorado corporation (the "Depositor"), (ii) The Bank of New York, a New York
banking corporation, as trustee (the "Property Trustee"), (iii) The Bank of New
York (Delaware), whose address in Delaware is White Clay Center, Route 273,
Newark, Delaware 19711, as Delaware trustee (the "Delaware Trustee"), (iv) Nancy
Felker, an individual whose address is 1225 17th Street, Suite 600, Denver,
Colorado 80502-5533 (the "Administrative Trustee") (the Property Trustee, the
Delaware Trustee and the Administrative Trustee are referred to collectively as
the "Trustees"), and (v) the several Holders, as hereinafter defined.

                                   WITNESSETH:

     WHEREAS, the Depositor, the Property Trustee, the Delaware Trustee and the
Administrative Trustee have heretofore duly declared and established a business
trust pursuant to the Delaware Business Trust Act by entering into a Declaration
of Trust, dated as of February 27, 1998 (the "Original Declaration"), and by
executing and filing with the Secretary of State of the State of Delaware a
Certificate of Trust on February 27, 1998, a form of which is attached hereto as
Exhibit A; and

     WHEREAS, the Depositor, the Property Trustee, the Delaware Trustee and the
Administrative Trustee desire to amend and restate the Original Declaration in
its entirety as set forth herein to provide for, among other things, (i) the
issuance of the Common Securities, as hereinafter defined, by the Trust to the
Depositor, (ii) the issuance and sale of one series of the Preferred Securities,
as hereinafter defined, by the Trust pursuant to the Underwriting Agreement, as
hereinafter defined, and (iii) the acquisition by the Trust from the Depositor
of the Debentures, as hereinafter defined.

     NOW, THEREFORE, in consideration of the agreements and obligations set
forth herein and for other good and valuable consideration, the sufficiency of
which is hereby acknowledged, each party, for the benefit of the other party and
for the benefit of the Securityholders, as hereinafter defined, hereby amends
and restates the Original Declaration in its entirety and agrees as follows:

                                    ARTICLE I

                                  Defined Terms

     Section 1.01.  Definitions.  For all purposes of this Declaration, except
as otherwise expressly provided or unless the context otherwise requires:

          (a) each term defined in this Article I has the meaning assigned to it
in this Article I and includes the plural as well as the singular;

          (b) each of the other terms used herein that is defined in the Trust
Indenture Act, either directly or by reference therein, has the meaning assigned
to it therein;
<PAGE>

          (c) 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 Declaration; and

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

     "Act" has the meaning specified in Section 6.08.

     "Administrative Trustee" means the individual identified as the
"Administrative Trustee" in the preamble to this Declaration, solely in his/her
capacity as Administrative Trustee of the Trust and not in his/her individual
capacity, or such Administrative Trustee's successor in interest in such
capacity, or any successor trustee appointed as herein provided.

     "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.

     "Bankruptcy Event" means, with respect to any Person, the occurrence of any
of the following events:

          (a) Such Person, pursuant to or within the meaning of any Bankruptcy
Law:

               (i) commences a voluntary case or proceeding;

               (ii) consents to the entry of an order for relief against it in
an involuntary case or proceeding;

               (iii) consents to the appointment of a Custodian of it or for all
or substantially all of its property, and such Custodian is not discharged
within 60 days;

               (iv) makes a general assignment for the benefit of its creditors;
or

               (v) admits in writing its inability to pay its debts generally as
they become due; or

          (b) A court of competent jurisdiction enters an order or decree under
any Bankruptcy Law that:

               (i) is for relief against such Person in an involuntary case or
proceeding;

               (ii) appoints a Custodian of such Person for all or substantially
all of its properties; or


                                       -2-
<PAGE>

               (iii) orders the liquidation of such Person,

 and in each case the order or decree remains unstayed and in effect for 60
days.

     "Bankruptcy Laws" means Title 11 of the United States Code, or similar
federal or state law for the relief of debtors.

     "Board Resolution" means (i) a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Depositor to have been duly adopted
by the Depositor's Board of Directors or a committee established thereby and to
be in full force and effect on the date of such certification or (ii) a
certificate signed by the authorized officer or officers of the Depositor to
whom the Depositor's Board of Directors or a committee established thereby has
delegated its authority, and in each case, delivered to the Trustees.

     "Book-Entry Preferred Securities Certificates" means certificates
representing Preferred Securities issued in global, fully registered form with
the Clearing Agency as described in Section 5.11.

     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
which is not a day on which banking institutions in The City of New York or the
State of Colorado are authorized or obligated by law, regulation or executive
order to close.

     "Clearing Agency" means an organization registered as a "clearing agency"
pursuant to Section 17A of the Securities Exchange Act of 1934, as amended, and
the rules and regulations promulgated thereunder.  The Depository Trust Company
will be the initial Clearing Agency.

     "Closing Date" means the Time of Delivery as defined in the Underwriting
Agreement, which date is also the date of execution and delivery of this
Declaration.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted, created under the Securities Exchange Act of 1934, as amended,
or, if at any time after the execution of this Declaration 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.

     "Common Security" means an undivided beneficial interest in the assets of
the Trust, having a Liquidation Amount of $25 and having the rights provided
therefor in this Declaration, including the right to receive Distributions and a
Liquidation Distribution as provided herein.

     "Common Securities Certificate" means a certificate evidencing ownership of
Common Securities, substantially in the form attached hereto as Exhibit B.


                                       -3-
<PAGE>

     "Company Indemnified Person" means the Administrative Trustee or any
Affiliate, agent or representative thereof.

     "Corporate Trust Office" means the principal corporate office of the
Property Trustee located in New York which at the date hereof is 101 Barclay
Street, Floor 21 West, New York, New York.

     "Creditor" has the meaning specified in Section 2.03(d).

     "Custodian" means any receiver, trustee, assignee, liquidator,
sequestrator, custodian or similar official under any Bankruptcy Law.

     "Debenture Event of Default" means an "Event of Default" as defined in the
Indenture with respect to the Debentures.

     "Debenture Redemption Date" means "Redemption Date" as defined in the
Indenture with respect to the Debentures.

     "Debenture Trustee" means The Bank of New York, a New York banking
corporation, in its capacity as trustee under the Indenture, or any successor
thereto appointed in accordance with the terms and provisions of the Indenture.

     "Debentures" means the Depositor's 7.60% Deferrable Interest Subordinated
Debentures due 2038 issued pursuant to the Indenture.

     "Declaration" means this Amended and Restated Declaration, as the same may
be modified, amended or supplemented in accordance with the applicable
provisions hereof, including all exhibits hereto, including, for all purposes of
this Declaration and any such modification, amendment or supplement, the
provisions of the Trust Indenture Act that are deemed to be a part of and govern
this Declaration and any such modification, amendment or supplement,
respectively.

     "Definitive Preferred Securities Certificates" means certificates
representing Preferred Securities issued in certificated, fully registered form
as described in Section 5.12.

     "Delaware Business Trust Act" means Chapter 38 of Title 12 of the Delaware
Code, 12 Del.  C.  ss.  3801, et seq., as it may be amended from time to time.

     "Delaware Trustee" means the entity identified as the "Delaware Trustee" in
the preamble to this Declaration solely in its capacity as Delaware Trustee of
the Trust and not in its individual capacity, or its successor in interest in
such capacity, or any successor Delaware Trustee appointed as herein provided.

     "Depositor" has the meaning specified in the preamble to this Declaration.


                                       -4-
<PAGE>

     "Distribution Date" has the meaning specified in Section 4.01(a).

     "Distributions" means amounts payable in respect of the Trust Securities as
provided in Section 4.01.

     "Event of Default" means the occurrence of a Debenture Event of Default
(whatever the reason for such Event of Default and whether it shall be voluntary
or involuntary or be effected by operation of law or pursuant to any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body).

     "Expiration Date" has the meaning specified in Section 8.01.

     "Extension Period" means the period or periods in which pursuant to the
Indenture payments of interest on the Debentures are deferred by extending the
interest payment periods thereof.

     "Guarantee" means the Preferred Securities Guarantee Agreement executed and
delivered by the Depositor to The Bank of New York, a New York banking
corporation, as trustee thereunder, contemporaneously with the execution and
delivery of this Declaration, for the benefit of the Holders of the Preferred
Securities, as amended from time, to time.

     "Indenture" means the Indenture, dated as of May 1, 1998 between the
Depositor and the Debenture Trustee, as trustee thereunder, as amended or
supplemented from time to time, providing for the issuance of Subordinated Debt
Securities of the Depositor.

     "Investment Company" means any company subject to the 1940 Act.

     "Lien" means any lien, pledge, charge, encumbrance, mortgage, deed of
trust, adverse ownership interest, hypothecation, assignment, security interest
or preference, priority or other security agreement or preferential arrangement
of any kind or nature whatsoever.

     "Like Amount" means (a) with respect to a redemption of Trust Securities,
Trust Securities having an aggregate Liquidation Amount equal to the principal
amount of Debentures to be paid in accordance with the Indenture and (b) with
respect to a distribution of Debentures to Holders of Trust Securities in
connection with a dissolution and liquidation of the Trust, Debentures having a
principal amount equal to the aggregate Liquidation Amount of the Trust
Securities in exchange for which such Debentures are distributed.

     "Liquidation Amount" means the stated amount of $25 per Trust Security.

     "Liquidation Date" means the date on which Debentures are to be distributed
to Holders of Trust Securities in connection with a dissolution and liquidation
of the Trust pursuant to Section 8.04(a).

     "Liquidation Distribution" has the meaning specified in Section 8.04(d).


                                       -5-
<PAGE>

     "1940 Act" means the Investment Company Act of 1940, as amended.

     "Officers' Certificate" means a certificate signed by the Chairman, the
President or any Senior or Executive Vice President, and the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Depositor.

     "Opinion of Counsel" means a written opinion of counsel, who may be counsel
for the Trust, the Property Trustee or the Depositor or an Affiliate of the
Depositor, but not an employee of any thereof, and who shall be acceptable to
the Property Trustee.

     "Original Declaration" has the meaning specified in the recitals to this
Declaration.

     "Outstanding", when used with respect to Trust Securities, means, as of the
date of determination, all Trust Securities theretofore executed and delivered
under this Declaration, except:

          (a) Trust Securities theretofore cancelled by the Administrative
Trustee or delivered to the Administrative Trustee for cancellation;

          (b) Trust Securities for whose redemption money in the necessary
amount has been theretofore deposited with the Property Trustee or any Paying
Agent for the Holders of such Trust Securities; provided that, if such Trust
Securities are to be redeemed, notice of such redemption has been duly given
pursuant to this Declaration;

          (c) Trust Securities which have been paid or in exchange for or in
lieu of which other Trust Securities have been executed and delivered pursuant
to Section 5.05, other than any such Trust Securities in respect of which there
shall have been presented to the Property Trustee proof satisfactory to it that
such Trust Securities are held by a bona fide purchaser; and

          (d) as provided in Section 8.04(c);

provided, however, that in determining whether the Holders of the requisite
Liquidation Amount of the Outstanding Preferred Securities have given any
request, demand, authorization, direction, notice, consent or waiver hereunder,
Preferred Securities owned by the Depositor, any Trustee or any Affiliate of the
Depositor or any Trustee shall be disregarded and deemed not to be Outstanding,
except that (a) in determining whether any Trustee shall be protected in relying
upon any such request, demand, authorization, direction, notice, consent or
waiver, only Preferred Securities which such Trustee actually knows to be so
owned shall be so disregarded and (b) the foregoing shall not apply at any time
when all of the Outstanding Preferred Securities are owned by the Depositor, one
or more of the Trustees and/or any such Affiliate.  Preferred Securities so
owned which have been pledged in good faith may be regarded as Outstanding if
the pledgee establishes to the satisfaction of the Administrative Trustee the
pledgee's right so to act with respect to such Preferred Securities and that the
pledgee is not the Depositor or any Affiliate of the Depositor.


                                       -6-
<PAGE>

     "Paying Agent" means the Property Trustee and any co-paying agent appointed
pursuant to Section 5.09.

     "Payment Account" means a segregated non-interest-bearing corporate trust
account maintained by the Property Trustee in its trust department for the
benefit of the Securityholders in which all amounts paid to the Property Trustee
in respect of the Debentures or the Guarantee will be held and from which the
Property Trustee or such other Paying Agent shall make payments to the
Securityholders in accordance with Article 4.

     "Person" means any individual, corporation, partnership, limited liability
company, joint venture, association, joint-stock company, trust, unincorporated
organization, government or any agency or political subdivision thereof or any
other entity.

     "Preferred Security" means a preferred security issued by the Trust,
constituting an undivided beneficial interest in the assets of the Trust, having
a Liquidation Amount of $25 and having rights provided therefor in this
Declaration, including the right to receive Distributions and a Liquidation
Distribution as provided herein.

     "Preferred Securities Certificate" means a certificate evidencing ownership
of one or more Preferred Securities, substantially in the form attached hereto
as Exhibit C.

     "Pricing Agreement" means any pricing agreement between the Trust, the
Depositor and the underwriters named therein with respect to the offer and sale
of the Preferred Securities.

     "Property Trustee" means the commercial bank or trust company identified as
the "Property Trustee" in the preamble to this Declaration solely in its
capacity as Property Trustee of the Trust and not in its individual capacity, or
its successor in interest in such capacity, or any successor Property Trustee
appointed as herein provided.

     "Redemption Date" means, with respect to any Trust Security to be redeemed,
the date fixed for such redemption by or pursuant to this Declaration; provided
that each Debenture Redemption Date and the stated maturity of the Debentures
shall be a Redemption Date for a Like Amount of Trust Securities.

     "Redemption Price" means, with respect to any Trust Security, the
Liquidation Amount of such Trust Security, plus accumulated and unpaid
Distributions thereon to the Redemption Date.

     "Securities Register" and "Securities Registrar" have the respective
meanings specified in Section 5.04.

     "Securityholder" or "Holder" means a Person in whose name a Trust Security
or Securities is registered in the Securities Register; any such Person is a
beneficial owner within the meaning of the Delaware Business Trust Act.

     "Successor Securities" has the meaning specified in Section 9.01.


                                       -7-
<PAGE>

     "Trust" means the Delaware business trust created pursuant to the Original
Declaration and continued hereby and identified on the cover page to this
Declaration.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this Declaration 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.

     "Trust Property" means (a) the Debentures, (b) any cash on deposit in, or
owing to, the Payment Account and (c) all proceeds and rights in respect of the
foregoing and any other property and assets for the time being held or deemed to
be held by the Property Trustee pursuant to the trusts of this Declaration.

     "Trust Security" means any one of the Common Securities or the Preferred
Securities.

     "Trust Securities Certificate" means any one of the Common Securities
Certificates or the Preferred Securities Certificates.

     "Underwriting Agreement" means the Underwriting Agreement, dated May 6,
1998 among the Trust, the Depositor and the Underwriters named therein.

                                   ARTICLE II

                            Continuation of the Trust

     Section 2.01.  Name.  The Trust continued hereby shall be known as "PSCO
Capital Trust I" as such name may be modified from time to time by the
Administrative Trustee following written notice to the Holders of Trust
Securities and the other Trustees, in which name the Trustees may conduct the
business of the Trust, make and execute contracts and other instruments on
behalf of the Trust and sue and be sued.

     Section 2.02.  Office of the Delaware Trustee; Principal Place of Business.
The address of the Delaware Trustee in the State of Delaware is White Clay
Center, Route 273, Newark, Delaware 19711 or such other address in the State of
Delaware as the Delaware Trustee may designate by written notice to the
Securityholders and the Depositor.  The principal place of business of the Trust
is c/o Public Service Company of Colorado, 1225 17th Street, Denver, Colorado
80202.

     Section 2.03.  Initial Contribution of Trust Property; Expenses of the
Trust.

     (a) The Property Trustee acknowledges receipt in trust from the Depositor
in connection with the Original Declaration of the sum of $10, which constituted
the initial Trust Property.

     (b) The Depositor shall be responsible for and shall pay for all
obligations (other than with respect to the Trust Securities) and all costs and
expenses of the Trust (including, but not limited


                                       -8-
<PAGE>

to, costs and expenses relating to the organization of the Trust, the issuance
and sale of the Preferred Securities, the fees and expenses (including
reasonable counsel fees and expenses) of the Trustees as provided in Section
7.06, the costs and expenses of accountants, attorneys, statistical or
bookkeeping services, expenses for printing and engraving and computing or
accounting equipment, Paying Agent(s), Securities Registrar, duplication, travel
and telephone and other telecommunications expenses and costs and expenses
incurred in connection with the disposition of the Trust Property).

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

     (d) The Depositor's obligations under this Section 2.03 shall be for the
benefit of, and shall be enforceable by, the Property Trustee and any Person to
whom any such obligations, costs, expenses and taxes are owed (a "Creditor")
whether or not such Creditor has received notice hereof.  The Property Trustee
and any such Creditor may enforce the Depositor's obligations under this Section
2.03 directly against the Depositor and the Depositor irrevocably waives any
right or remedy to require that the Property Trustee or any such Creditor take
any action against the Trust or any other Person before proceeding against the
Depositor.  The Depositor agrees to execute such additional agreements as may be
necessary or desirable in order to give full effect to the provisions of this
Section 2.03.

     (e) The Depositor shall make no claim upon the Trust Property for the
payment of such expenses.

     (f) Except as expressly set forth in this Declaration, the Debentures, the
Guarantee and the terms of the Preferred Securities, the Depositor shall not be
personally liable for the return of any portion of the capital contributions (or
any return thereon) of the Holders of the Preferred Securities which shall be
made solely from the Trust Property, and shall not be required to pay to the
Trust or to any Holder of Preferred Securities any deficit upon dissolution of
the Trust or otherwise.


     Section 2.04.  Issuance of the Trust Securities.

     (a) The Trust may issue only one series of Preferred Securities and one
series of Common Securities.

     (b) The Depositor, on behalf of the Trust and pursuant to the Original
Declaration, executed and delivered the Underwriting Agreement and the Pricing
Agreement.  Contemporaneously with the execution and delivery of this
Declaration, the Administrative Trustee, on behalf of the Trust, shall execute
in accordance with Section 5.02 and deliver to the Underwriters named in the
Underwriting Agreement one or more Book-Entry Preferred Securities Certificates,
registered in the name of the nominee of the initial Clearing Agency,
representing


                                       -9-
<PAGE>

Seven Million, Seven Hundred Sixty Thousand (7,760,000) Preferred Securities
having an aggregate Liquidation Amount of $194,000,000, against receipt by the
Property Trustee of the aggregate purchase price of such Preferred Securities of
$194,000,000, which amount the Administrative Trustee shall promptly deliver to
the Property Trustee.  Contemporaneously therewith, the Administrative Trustee,
on behalf of the Trust, shall execute in accordance with Section 5.02 and
deliver to the Depositor a Common Securities Certificate, registered in the name
of the Depositor, representing Two Hundred Forty Thousand (240,000) Common
Securities having an aggregate Liquidation Amount of $6,000,000, and in
satisfaction of the purchase price of such Common Securities the Depositor shall
deliver to the Property Trustee the sum of $6,000,000.

     Section 2.05.  Purchase of Debentures.  Contemporaneously with the
execution and delivery of this Declaration (i) the Administrative Trustee, on
behalf of the Trust, shall purchase $200,000,000 aggregate principal amount of
Debentures from the Depositor, registered in the name of the Property Trustee on
behalf of the Securityholders and the Trust and (ii) in satisfaction of the
purchase price for such Debentures, the Property Trustee, on behalf of the
Trust, shall deliver to the Depositor the sum of $200,000,000.

     Section 2.06.  Declaration.

     (a) The exclusive purposes and functions of the Trust are (1) to issue and
sell Trust Securities and use the gross proceeds from such sale to acquire the
Debentures, (2) to maintain the status of the Trust as a grantor trust for
United States Federal income tax purposes, and (3) except as otherwise limited
herein, to engage in only those activities necessary, appropriate, convenient or
incidental thereto.  The Depositor hereby appoints the Trustees as trustees of
the Trust, to have all the rights, powers and duties to the extent set forth
herein, and the Trustees hereby accept such appointment.  The Property Trustee
hereby declares that it will hold the Trust Property in trust upon and subject
to the conditions set forth herein for the benefit of the Securityholders.  The
Administrative Trustee shall have all rights, powers and duties set forth
herein.  The Delaware Trustee shall not be entitled to exercise any powers, nor
shall the Delaware Trustee have any of the duties and responsibilities of the
Property Trustee or the Administrative Trustee set forth herein.  The Delaware
Trustee shall be one of the Trustees of the Trust for the sole and limited
purpose of fulfilling the requirements of Section 3807 of the Delaware Business
Trust Act.

     (b) The Trust will be classified as a grantor trust for United States
federal income tax purposes under Subpart E of Subchapter J of the Code,
pursuant to which the Holders of the Preferred Securities and the Common
Securities will be the owners of the Trust for United States federal income tax
purposes, and such Holders will include directly in their gross income the
income, gain, deduction or loss of the Trust as if the Trust did not exist.  By
the acceptance of this Trust neither the Trustees, the Depositor nor the owners
of the Preferred Securities or Common Securities will take any position for
United States federal income tax purposes which is contrary to the
classification of the Trust as a grantor trust.


                                      -10-
<PAGE>

     Section 2.07.  Authorization to Enter into Certain Transactions.

     (a) The Trustees shall conduct the affairs of the Trust in accordance with
the terms of this Declaration.  Subject to the limitations set forth in
paragraph (b) of this Section, and in accordance with the following provisions
(i) and (ii), the Trustees shall have the authority to enter into all
transactions and agreements determined by the Trustees to be appropriate in
exercising the authority, express or implied, otherwise granted to the Trustees
under this Declaration, and to perform all acts in furtherance thereof,
including without limitation, the following:

          (i)  As among the Trustees, the Administrative Trustee shall have the
     power and authority to act on behalf of the Trust with respect to the
     following matters:

               (A) executing and delivering the Trust Securities on behalf of
          the Trust;

               (B) causing the Trust to enter into, and executing, delivering
          and performing on behalf of the Trust, such agreements as, in the
          Administrative Trustee's opinion, may be necessary or desirable in
          connection with the purposes and function of the Trust, including the
          appointment of a depository and registrar as well as any successor
          thereto;

               (C) assisting in registering the Preferred Securities under the
          Securities Act of 1933, as amended, under the Securities Exchange Act
          of 1934, as amended, and under state securities or blue sky laws, and
          qualifying this Declaration as a trust indenture under the Trust
          Indenture Act;

               (D) assisting in the listing of the Preferred Securities upon
          such securities exchange or exchanges as the Depositor shall determine
          and the registration of the Preferred Securities under the Securities
          Exchange Act of 1934, as amended, and the preparation and filing of
          all periodic and other reports and other documents pursuant to the
          foregoing;

               (E) acquiring the Debentures with the proceeds of the sale of the
          Preferred Securities and the Common Securities; PROVIDED, HOWEVER,
          that the Administrative Trustee shall cause legal title to the
          Debentures to be held of record in the name of the Property Trustee
          for the benefit of the Holders of the Preferred Securities, the Holder
          of Common Securities and the Trust;

               (F) to the extent provided in this Declaration, terminating and
          liquidating the Trust and preparing, executing and filing the
          certificate of cancellation with the Secretary of State of the State
          of Delaware;

               (G) sending notices or assisting the Property Trustee in sending
          notices and other information regarding the Trust Securities and the
          Debentures to Securityholders in accordance with this Declaration;


                                      -11-
<PAGE>

               (H) employing or otherwise engaging employees and agents (who may
          be designated as officers with titles) and managers, contractors,
          advisors, and consultants and paying reasonable compensation for the
          services provided by such Persons;

               (I) causing the Trust to comply with the Trust's obligations
          under the Trust Indenture Act;

               (J) incurring expenses that are necessary, appropriate,
          convenient or incidental to carry out any of the purposes of the
          Trust;

               (K) taking all action that may be necessary or appropriate for
          the preservation and the continuation of the Trust's valid existence,
          rights, franchises and privileges as a statutory business trust under
          the laws of the State of Delaware and of each other jurisdiction in
          which such existence is necessary to protect the limited liability of
          the Holders of the Preferred Securities or to enable the Trust to
          effect the purposes for which the Trust was created;

               (L) taking all action necessary to cause all applicable tax
          returns and tax information reports that are required to be filed with
          respect to the Trust to be duly prepared and filed by the
          Administrative Trustee, on behalf of the Trust;

               (M) taking all actions and performing such duties as may be
          required of the Administrative Trustee pursuant to the terms of this
          Declaration; and

               (N) taking any action incidental to the foregoing as the
          Administrative Trustee may from time to time determine is necessary or
          advisable to give effect to the terms of this Declaration for the
          benefit of the Securityholders (without consideration of the effect of
          any such action on any particular Securityholder).

          Any expenses incurred by the Administrative Trustee pursuant to this
Section 2.07 shall be reimbursed by the Depositor.

          (ii) As among the Trustees, the Property Trustee shall have the power,
     duty and authority to act on behalf of the Trust with respect to the
     following matters:

               (A) establishing and maintaining the Payment Account and
          appointing Paying Agents (subject to Section 5.09);

               (B) receiving payment of the purchase price of the Trust
          Securities;

               (C) receiving and holding the Debentures;

               (D) collecting interest and principal payments on the Debentures
          and depositing them in the Payment Account;


                                      -12-
<PAGE>

               (E) making Distributions and other payments to the
          Securityholders in respect of the Trust Securities;

               (F) exercising all of the rights, powers and privileges of a
          holder of the Debentures;

               (G) sending notices of defaults, redemptions, Extension Periods,
          liquidations and other information regarding the Trust Securities and
          the Debentures to the Securityholders in accordance with this
          Declaration;

               (H) to the extent provided in this Declaration, terminating and
          liquidating the Trust, including distributing the Trust Property in
          accordance with the terms of this Declaration, and preparing,
          executing and filing the certificate of cancellation with the
          Secretary of State of the State of Delaware;

               (I) taking all action and performing such duties as may be
          required of the Property Trustee pursuant to the terms of this
          Declaration;

               (J) after an Event of Default, taking any action incidental to
          the foregoing as the Property Trustee may from time to time determine
          is necessary or advisable to give effect to the terms of this
          Declaration and protect and conserve the Trust Property for the
          benefit of the Securityholders (without consideration of the effect of
          any such action on any particular Securityholder); and

               (K) registering transfers and exchanges of the Preferred
          Securities in accordance with this Declaration (but only if at such
          time the Property Trustee shall be the Securities Registrar).

     (b) So long as this Declaration remains in effect, the Trust (or the
Trustees acting on behalf of the Trust) shall not undertake any business,
activities or transaction except as expressly provided herein or contemplated
hereby.  In particular, the Trustees acting on behalf of the Trust shall not (i)
acquire any assets or investments (other than the Debentures), reinvest the
proceeds derived from investments, possess any power or otherwise act in such a
way as to vary the Trust Property or engage in any activities not authorized by
this Declaration, (ii) sell, assign, transfer, exchange, mortgage, pledge, set-
off or otherwise dispose of any of the Trust Property or interests therein,
including to Securityholders, except as expressly provided herein, (iii) take
any action that would cause the Trust to fail or cease to qualify as a grantor
trust for United States Federal income tax purposes, (iv) incur any indebtedness
for borrowed money or issue any other debt, (v) issue any securities or other
evidences of beneficial ownership of, or beneficial interests in, the Trust
other than the Trust Securities, or (vi) take or consent to any action that
would result in the placement of a Lien on any of the Trust Property.  The
Administrative Trustee shall defend all claims and demands of all Persons at any
time claiming any Lien on any of the Trust Property adverse to the interest of
the Trust or the Securityholders in their capacity as Securityholders.


                                      -13-
<PAGE>

     (c) In connection with the issue and sale of the Preferred Securities, the
Depositor shall have the right and responsibility to assist the Trust with
respect to, or effect on behalf of the Trust, the following (and any actions
taken by the Depositor in furtherance of the following prior to the date of this
Declaration are hereby ratified and confirmed in all respects):

          (i)   preparing for filing, filing with the Commission and executing
     on behalf of the Trust a registration statement on Form S-3 in relation to
     the Preferred Securities, including any amendments thereto;

          (ii)  determining the States in which to take appropriate action to
     qualify or register for sale all or part of the Preferred Securities and
     doing any and all such acts, other than actions which must be taken by or
     on behalf of the Trust, and advising the Trustees of actions they must take
     on behalf of the Trust, and preparing for execution and filing any
     documents to be executed and filed by the Trust or on behalf of the Trust,
     as the Depositor deems necessary or advisable in order to comply with the
     applicable laws of any such States;

          (iii) preparing for filing, filing and executing on behalf of the
     Trust an application to the New York Stock Exchange or any other national
     stock exchange or The Nasdaq National Market for listing upon notice of
     issuance of any Preferred Securities, and preparing for filing, filing and
     executing on behalf of the Trust all other applications, statements,
     certificates, agreements and other instruments as shall be necessary for
     such listing;

          (iv)  preparing for filing, filing with the Commission and executing 
     on behalf of the Trust a registration statement on Form 8-A relating to 
     the registration of the Preferred Securities under Section 12(b) or 12(g)
     of the Securities Exchange Act of 1934, as amended, including any 
     amendments thereto;

          (v)   negotiating the terms of, executing, delivering and performing
     the Underwriting Agreement and any Pricing Agreement providing for the sale
     of the Preferred Securities; and

          (vi)  taking any other actions necessary or desirable to carry out any
     of the foregoing activities.

     (d) Notwithstanding anything herein to the contrary, the Administrative
Trustee is authorized and directed to conduct the affairs of the Trust and to
operate the Trust so that (i) the Trust will not be deemed to be an Investment
Company required to be registered under the 1940 Act, or taxed as a corporation
or a partnership for United States Federal income tax purposes; (ii) the Trust
will qualify as a grantor trust for United States Federal income tax purposes;
and (iii) the Debentures will be treated as indebtedness of the Depositor for
United States Federal income tax purposes.  In this connection, the Depositor
and the Administrative Trustee are authorized to take any action, not
inconsistent with applicable law, the Certificate of Trust, as


                                      -14-
<PAGE>

amended from time to time, or this Declaration, that each of the Depositor and
the Administrative Trustee determines in their discretion to be necessary or
desirable for such purposes.

     Section 2.08.  Assets of Trust.  The assets of the Trust shall consist of
the Trust Property.

     Section 2.09.  Title to Trust Property.  Legal title to all Trust Property
shall be vested at all times in the Property Trustee (in its capacity as such)
and shall be held and administered by the Property Trustee for the benefit of
the Securityholders and the Trust in accordance with this Declaration.

                                   ARTICLE III

                                 Payment Account

     Section 3.01  Payment Account.

     (a) On or prior to the Closing Date, the Property Trustee shall establish
the Payment Account.  All monies and other property deposited or held from time
to time in the Payment Account shall be held by the Property Trustee for the
exclusive benefit of the Securityholders.  The Property Trustee shall have
exclusive control of the Payment Account for the purpose of making deposits in
and withdrawals from the Payment Account in accordance with this Declaration;
provided that any Paying Agent shall have the right of withdrawal with respect
to the Payment Account solely for the purpose of making the payments
contemplated under Article 4.

     (b) The Property Trustee shall deposit in the Payment Account, promptly
upon receipt, all payments of principal of or interest on the Debentures and any
amounts paid to the Property Trustee pursuant to the Guarantee.  Amounts held in
the Payment Account shall not be invested pending distribution thereof.

                                   ARTICLE IV

                            Distributions; Redemption

     Section 4.01.  Distributions.

     (a) Distributions on the Trust Securities shall be cumulative, and will
accumulate whether or not there are funds of the Trust available for the payment
of Distributions.  Distributions shall accumulate from May 11, 1998 and, except
during an Extension Period for the Debentures pursuant to the Indenture, shall
be payable quarterly in arrears on March 31, June 30, September 30 and December
31 of each year, commencing on June 30, 1998.  If any date on which
Distributions are otherwise payable on the Trust Securities is not a Business
Day, then the payment of such Distributions shall be made on the next succeeding
day which is a Business Day (and without any interest or other payment in
respect of any such delay), except that, if such Business Day is in the next
succeeding calendar year, payment of such Distributions shall be made on the
immediately preceding Business Day, in each case with the same force and effect
as if made


                                      -15-
<PAGE>

on such date (each date on which Distributions are payable in accordance with
this Section 4.01(a) is referred to as a "Distribution Date").

     Within two Business Days after receipt by the Property Trustee of notice of
an Extension Period pursuant to the Indenture, the Property Trustee shall give
notice thereof to the Securityholders by first class mail, postage prepaid.

     (b) The Trust Securities represent undivided beneficial interests in the
Trust Property, and, subject to Sections 4.03 and 4.06 hereof, all Distributions
will be made pro rata on each of the Trust Securities.  Distributions on the
Trust Securities shall be payable at a rate of 7.60% per annum of the
Liquidation Amount of the Trust Securities.  The amount of Distributions payable
for any full quarterly period shall be computed on the basis of a 360-day year
of twelve 30-day months, and for any period shorter than a full quarterly
Distribution period for which Distributions are computed, Distributions will be
computed based on the actual number of days elapsed per 90-day quarter.  During
an Extension Period for the Debentures, the rate per annum at which
Distributions on the Trust Securities accumulate shall be increased by an amount
such that the aggregate amount of Distributions that accumulate on all Trust
Securities during any such Extension Period is equal to the aggregate amount of
interest (including interest payable on unpaid interest at the rate per annum
set forth above, compounded quarterly, to the extent permitted by applicable
law) that accrues during any such Extension Period on the Debentures.

     (c) Distributions on the Trust Securities shall be made from the Payment
Account by the Property Trustee or any Paying Agent and shall be payable on each
Distribution Date only to the extent that the Trust has funds then available in
the Payment Account for the payment of such Distributions.

     (d) Distributions on the Trust Securities on each Distribution Date shall
be payable to the Holders thereof as they appear on the Securities Register for
the Trust Securities on the relevant record date, which shall be one Business
Day prior to such Distribution Date; provided, however, that in the event that
the Preferred Securities are not in book-entry-only form, the relevant record
date shall be the 15th day of the last month of each calendar quarter, whether
or not a Business Day.

     Section 4.02.  Redemption.

     (a) Upon receipt by the Trust of a notice of redemption of Debentures, the
Trust will call for redemption a Like Amount of Trust Securities at the
Redemption Price on the Debenture Redemption Date and will call for redemption
all Outstanding Trust Securities on the stated maturity date of the Debentures.

     (b) Notice of redemption shall be given by the Property Trustee 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 Trust Securities to be redeemed, at
such Holder's address appearing in the Securities Register.  All notices of
redemption shall state:


                                      -16-
<PAGE>

          (i)   the Redemption Date;

          (ii)  the Redemption Price;

          (iii) the CUSIP number;

          (iv)  the place or places where Trust Securities Certificates are to
     be surrendered for payment of the Redemption Price;

          (v)   that on the Redemption Date the Redemption Price will become
     payable upon each such Trust Security to be redeemed and that Distributions
     thereon will cease to accumulate on and after such date; and

          (vi)  if less than all of the Outstanding Trust Securities are to be
     redeemed, the identification and total Liquidation Amount of the particular
     Trust Securities to be redeemed.

     (c) The Trust Securities redeemed on each Redemption Date shall be redeemed
at the Redemption Price with the proceeds from the contemporaneous redemption or
payment at maturity of Debentures.  Redemptions of the Trust Securities shall be
made and the Redemption Price shall be payable on each Redemption Date only to
the extent that the Trust has funds then available in the Payment Account for
the payment of such Redemption Price.

     (d) If the Trust, by action of the Property Trustee, gives a notice of
redemption in respect of any Trust Securities, then, on the Redemption Date,
subject to Section 4.02(c), the Property Trustee will irrevocably deposit with
the Paying Agent funds sufficient to pay the Redemption Price for the Trust
Securities being redeemed on such date and will give the Paying Agent
irrevocable instructions and authority to pay the Redemption Price to the
Holders of such Trust Securities upon surrender of their Trust Securities
Certificates.  Notwithstanding the foregoing, Distributions payable on or prior
to the Redemption Date for any Trust Securities called for redemption shall be
payable to the Holders of such Trust Securities as they appear on the Securities
Register for the Trust Securities on the record dates for the related
Distribution Dates.  If notice of redemption shall have been given and funds
irrevocably deposited as required, then upon the date of such deposit, all
rights of Securityholders holding Trust Securities so called for redemption will
cease, except the right of such Securityholders to receive the Redemption Price,
but without interest, and such Trust Securities will cease to be Outstanding.
In the event that any date on which any Redemption Price is payable is not a
Business Day, then payment of the Redemption Price payable on such date will be
made on the next succeeding day which is a Business Day (and without any
interest or other payment in respect of any such delay), except that, if such
Business Day is in the next succeeding calendar year, such payment will be made
on the immediately preceding Business Day, in each case, with the same force and
effect as if made on such date.  In the event that payment of the Redemption
Price in respect of any Trust Securities called for redemption is improperly
withheld or refused, and not paid either by the Trust or by the Depositor
pursuant to the Guarantee, Distributions on such Trust Securities will continue
to accumulate, at the then applicable rate, from the Redemption Date originally


                                      -17-
<PAGE>

established by the Trust for such Trust Securities to the date such Redemption
Price is actually paid, in which case the actual payment date will be the date
fixed for redemption for purposes of calculating the Redemption Price.

     (e) If less than all the Outstanding Trust Securities are to be redeemed on
a Redemption Date, then the aggregate Liquidation Amount of Trust Securities to
be redeemed shall be allocated 3% to the Common Securities and 97% to the
Preferred Securities.  The particular Preferred Securities to be redeemed shall
be selected by the Property Trustee from the Outstanding Preferred Securities
not previously called for redemption, by such method as the Property Trustee
shall deem fair and appropriate.  The Property Trustee shall promptly notify the
Securities Registrar in writing of the Preferred Securities selected for
redemption.  If fewer than all of the Trust Securities represented by a Trust
Securities Certificate are redeemed, the Administrative Trustee shall execute
for the Holder a new Trust Securities Certificate representing the unredeemed
Trust Securities.  For all purposes of this Declaration, unless the context
otherwise requires, all provisions relating to the redemption of Preferred
Securities shall relate, in the case of any Preferred Securities redeemed or to
be redeemed only in part, to the portion of the Liquidation Amount of Preferred
Securities which has been or is to be redeemed.

     Section 4.03.  Subordination of Common Securities.

     (a) Payment of Distributions on, and the Redemption Price of, the Trust
Securities, as applicable, shall be made pro rata based on the Liquidation
Amount of the Trust Securities; provided, however, that if on any Distribution
Date or Redemption Date, a Debenture Event of Default shall have occurred and be
continuing, no payment of any Distribution on, or Redemption Price of, any
Common Security, and no other payment on account of the liquidation of Common
Securities, shall be made unless payment in full in cash of all accumulated and
unpaid Distributions on all Outstanding Preferred Securities for all
distribution periods terminating on or prior thereto, or in the case of payment
of the Redemption Price, the full amount of such Redemption Price on all
Outstanding Preferred Securities then being redeemed, shall have been made or
provided for, and all funds immediately available to the Property Trustee shall
first be applied to the payment in full in cash of all Distributions on, or the
Redemption Price of, Preferred Securities then due and payable.

     (b) In the case of the occurrence and continuance of any Debenture Event of
Default, the Holder of Common Securities will be deemed to have waived any right
to act with respect to any related Event of Default under this Declaration and
such Debenture Event of Default until the effect of such related Event of
Default and such Debenture Event of Default has been cured, waived or otherwise
eliminated.  Until any such Event of Default under this Declaration and such
Debenture Event of Default has been so cured, waived or otherwise eliminated,
the Property Trustee shall act solely on behalf of the Holders of the Preferred
Securities and not the Holder of the Common Securities, and only the Holders of
the Preferred Securities will have the right to direct the Property Trustee to
act on their behalf.

     Section 4.04.  Payment Procedures.  Payments of Distributions pursuant to
Section 4.01 in respect of the Preferred Securities shall be made by check
mailed to the address of the Holder


                                      -18-
<PAGE>

thereof as such address shall appear on the Securities Register or, if the
Preferred Securities are held by a Clearing Agency, such Distributions shall be
made to the Clearing Agency by wire transfer in immediately available funds.
Payments of Distributions pursuant to Section 4.01 in respect of the Common
Securities shall be made in such manner as shall be mutually agreed between the
Property Trustee and the Holder of the Common Securities.  Payment of the
Redemption Price or Liquidation Distribution of the Trust Securities shall be
made in immediately available funds upon surrender of the Trust Securities
Certificate representing such Trust Securities at the Corporate Trust Office of
the Property Trustee.

     Section 4.05.  Tax Returns and Reports.  The Administrative Trustee shall
prepare (or cause to be prepared), at the Depositor's expense, and file all
Federal, State and local tax and information returns and reports required to be
filed by or in respect of the Trust.  In this regard, the Administrative Trustee
shall (a) prepare and file (or cause to be prepared or filed) the appropriate
Internal Revenue Service Form required to be filed in respect of the Trust in
each taxable year of the Trust and (b) prepare and furnish (or cause to be
prepared and furnished) to each Securityholder the related Internal Revenue
Service Form 1099 OID, or any successor form or the information required to be
provided on such form.  The Administrative Trustee shall provide the Depositor
and the Property Trustee with a copy of all such returns, reports and schedules
promptly after such filing or furnishing.  The Trustees shall comply with United
States Federal withholding and backup withholding tax laws and information
reporting requirements with respect to any payments to Securityholders under the
Trust Securities.

     Section 4.06.  Payments under Indenture.  Any amount payable hereunder to
any Holder of Preferred Securities shall be reduced by the amount of any
corresponding payment such Holder has directly received pursuant to Section 508
of the Indenture or pursuant to the Guarantee.  Notwithstanding the provisions
hereunder to the contrary, Securityholders acknowledge that any Holder of
Preferred Securities that receives payment under Section 508 of the Indenture
may receive amounts greater than the amount such Holder may be entitled to
receive pursuant to the other provisions of this Declaration.

                                    ARTICLE V

                          Trust Securities Certificates

     Section 5.01.  Initial Ownership.  Upon the creation of the Trust and the
contribution by the Depositor pursuant to Section 2.03 and until the issuance of
the Trust Securities, and at any time during which no Trust Securities are
Outstanding, the Depositor shall be the sole beneficial owner of the Trust.

     Section 5.02.  The Trust Securities Certificates.  The Trust Securities
Certificates shall be issued representing one or more Trust Securities.  Trust
Securities Certificates representing fractional interests shall not be issued.
The Trust Securities Certificates shall be executed on behalf of the Trust by
manual signature of the Administrative Trustee or by a facsimile signature of
the Administrative Trustee countersigned by the Securities Registrar.  Trust
Securities Certificates bearing the manual signatures of individuals who were,
at the time when such


                                      -19-
<PAGE>

signatures shall have been affixed, authorized to sign on behalf of the Trust,
shall be validly issued and entitled to the benefits of this Declaration,
notwithstanding that such individuals or any of them shall have ceased to be so
authorized prior to the delivery of such Trust Securities Certificates or did
not hold such offices at the date of delivery of such Trust Securities
Certificates.  A transferee of a Trust Securities Certificate shall become a
Securityholder, and shall be entitled to the rights and subject to the
obligations of a Securityholder hereunder, upon due registration of such Trust
Securities Certificate in such transferee's name pursuant to Section 5.04.

     Section 5.03.  Delivery of Trust Securities Certificates.  On the Closing
Date, the Administrative Trustee shall cause Trust Securities Certificates, in
an aggregate Liquidation Amount as provided in Section 2.04, to be executed on
behalf of the Trust as provided in Section 5.02 and delivered to or upon a
written order of the Depositor signed by any of its Chairman of the Board, its
President, any Vice President or the Treasurer, without further corporate action
by the Depositor, in authorized denominations.  The written order of the
Depositor shall be accompanied by an Officers' Certificate and an Opinion of
Counsel.

     Section 5.04.  Registration of Transfer and Exchange of Preferred
Securities Certificates.  A registrar appointed by the Depositor (the
"Securities Registrar") shall keep or cause to be kept, at the office or agency
maintained pursuant to Section 5.08, a register (the "Securities Register") in
which, subject to such reasonable regulations as it may prescribe, the
Securities Registrar shall provide for the registration of Trust Securities
Certificates (subject to Section 5.10 in the case of the Common Securities
Certificates) and registration of transfers and exchanges of Preferred
Securities Certificates as herein provided.  The Property Trustee shall be the
initial Securities Registrar; any successor Securities Registrar shall be
appointed by the Depositor.

     Upon surrender for registration of transfer of any Preferred Securities
Certificate at the office or agency maintained pursuant to Section 5.08, the
Administrative Trustee shall execute and deliver, in the name of the designated
transferee or transferees, one or more new Preferred Securities Certificates
representing the same number of Preferred Securities dated the date of execution
by the Administrative Trustee.  At the option of a Holder, Preferred Securities
Certificates may be exchanged for other Preferred Securities Certificates upon
surrender of the Preferred Securities Certificates to be exchanged at the office
or agency maintained pursuant to Section 5.08.  The Securities Registrar shall
not be required to register the transfer of any Preferred Securities that have
been called for redemption or after the Liquidation Date.

     Preferred Securities presented or surrendered for registration of transfer
or exchange shall be accompanied by a written instrument of transfer in form
satisfactory to the Administrative Trustee and the Securities Registrar duly
executed by the Holder or such Holder's attorney duly authorized in writing.
Each Preferred Securities Certificate surrendered for registration of transfer
or exchange shall be cancelled and subsequently disposed of by the Securities
Registrar in accordance with its customary practice.

     No service charge shall be made for any registration of transfer or
exchange of Preferred Securities, but the Securities Registrar may require
payment of a sum sufficient to cover any tax or


                                      -20-
<PAGE>

governmental charge that may be imposed in connection with any transfer or
exchange of Preferred Securities.

     Section 5.05.  Mutilated, Destroyed, Lost or Stolen Trust Securities
Certificates.  If (a) any mutilated Trust Securities Certificate shall be
surrendered to the Securities Registrar, or if the Securities Registrar shall
receive evidence to its satisfaction of the destruction, loss or theft of any
Trust Securities Certificate, and (b) there shall be delivered to the Securities
Registrar and the Administrative Trustee such security or indemnity as may be
required by them to hold the Securities Registrar and the Trust harmless, then
in the absence of notice that such Trust Securities Certificate shall have been
acquired by a bona fide purchaser, the Administrative Trustee, on behalf of the
Trust shall execute and make available for delivery, in exchange for or in lieu
of any such mutilated, destroyed, lost or stolen Trust Securities Certificate, a
new Trust Securities Certificate of like tenor.  In connection with the issuance
of any new Trust Securities Certificate under this Section, the Administrative
Trustee or the Securities Registrar may require the payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.  Any duplicate Trust Securities Certificate issued pursuant to this
Section shall constitute conclusive evidence of an undivided beneficial interest
in the assets of the Trust, as if originally issued, whether or not the lost,
stolen or destroyed Trust Securities Certificate shall be found at any time.

     Section 5.06.  Persons Deemed Securityholders.  Prior to due presentation
of a Trust Security Certificate for registration of transfer, the Administrative
Trustee, the Paying Agent or the Securities Registrar shall treat the Person in
whose name any Trust Securities Certificate shall be registered in the
Securities Register as the owner and Holder of such Trust Securities Certificate
for the purpose of receiving Distributions and for all other purposes
whatsoever, and neither the Trustees, the Paying Agent nor the Securities
Registrar shall be bound by any notice to the contrary.

     Section 5.07.  Access to List of Securityholders' Names and Addresses.  In
the event that the Property Trustee is no longer the Securities Registrar, the
Administrative Trustee or the Depositor shall furnish or cause to be furnished a
list, in such form as the Property Trustee may reasonably require, of the names
and addresses of the Securityholders as of the most recent record date (a) to
the Property Trustee, quarterly not later than 10 days prior to a Distribution
Date and (b) to the Property Trustee, promptly after receipt by the
Administrative Trustee or the Depositor of a request therefor from the Property
Trustee in order to enable the Paying Agent to pay Distributions in accordance
with Section 4.01 hereof, in each case to the extent such information is in the
possession or control of the Administrative Trustee or the Depositor and is not
identical to a previously supplied list or has not otherwise been received by
the Property Trustee.  The rights of Securityholders to communicate with other
Securityholders with respect to their rights under this Declaration or under the
Trust Securities, and the corresponding rights of the Property Trustee shall be
as provided in the Trust Indenture Act.  Each Holder, by receiving and holding a
Trust Securities Certificate, shall be deemed to have agreed not to hold the
Depositor, the Property Trustee, the Administrative Trustee or the Delaware
Trustee accountable by reason of the disclosure of its name and address,
regardless of the source from which such information was derived.


                                      -21-
<PAGE>

     Section 5.08.  Maintenance of Office or Agency.  The Securities Registrar
shall maintain in New York, New York an office or offices or agency or agencies
where Preferred Securities may be surrendered for registration of transfer or
exchange and where notices and demands to or upon the Trustees in respect of the
Trust Securities Certificates may be served.  The Property Trustee shall give
prompt written notice to the Depositor and to the Securityholders of any change
in the location of the Securities Register or any such office or agency, which
shall initially be at the Corporate Trust Office of the Property Trustee.

     Section 5.09.  Appointment of Paying Agent.  The Paying Agent shall make
Distributions to Securityholders from the Payment Account and shall report the
amounts of such Distributions to the Property Trustee and the Administrative
Trustee.  Any Paying Agent shall have the revocable power to withdraw funds from
the Payment Account for the purpose of making Distributions.  The Administrative
Trustee may revoke such power and remove the Paying Agent, provided that such
revocation and removal with respect to the sole Paying Agent shall not become
effective until the appointment of a successor.  The Paying Agent shall
initially be the Property Trustee, and any co-paying agent chosen by the
Property Trustee and acceptable to the Administrative Trustee and the Depositor.
Any Person acting as Paying Agent shall be permitted to resign as Paying Agent
upon 30 days' written notice to the Administrative Trustee and the Depositor,
and, if applicable, the Property Trustee, provided that such resignation with
respect to the sole Paying Agent shall not become effective until the
appointment of a successor.  In the event that the Property Trustee shall no
longer be the Paying Agent or a successor Paying Agent shall resign or its
authority to act be revoked, the Administrative Trustee shall appoint a
successor that is acceptable to the Property Trustee (in the case of any other
Paying Agent) and the Depositor to act as Paying Agent (which shall be a bank or
trust company and have a combined capital and surplus of at least $50,000,000).
The Administrative Trustee shall cause such successor Paying Agent or any
additional Paying Agent appointed by the Administrative Trustee to execute and
deliver to the Trustees an instrument in which such successor Paying Agent or
additional Paying Agent shall agree with the Trustees that as Paying Agent, such
successor Paying Agent or additional Paying Agent will hold all sums, if any,
held by it for payment to the Securityholders in trust for the benefit of the
Securityholders entitled thereto until such sums shall be paid to such
Securityholders.  The Paying Agent shall return all of such sums remaining
unclaimed to the Property Trustee and upon removal of a Paying Agent such Paying
Agent shall also return such sums in its possession to the Property Trustee.
The provisions of Sections 7.01, 7.03 and 7.06 shall apply to the Property
Trustee also in its role as Paying Agent, for so long as the Property Trustee
shall act as Paying Agent and, to the extent applicable, to any other Paying
Agent appointed hereunder.  Any reference in this Declaration to the Paying
Agent shall include any co-paying agent unless the context requires otherwise.

     Section 5.10.  Transfer of Securities.  Subject to this Article V, the
Depositor and any Affiliate may only transfer Common Securities to the Depositor
or an Affiliate of the Depositor; PROVIDED THAT, any such transfer is subject to
the condition precedent that the transferor obtain an opinion of counsel
experienced in such matters that such transfer would not cause more than an
insubstantial risk that:


                                      -22-
<PAGE>

          (i)  the Trust would not be classified for United States federal
     income tax purposes as a grantor trust; and

          (ii) the Trust would be an Investment Company or the transferee would
     become an Investment Company.

     Section 5.11.  Book-Entry Preferred Securities Certificates; Common
Securities Certificate.

     (a) The Preferred Securities, upon original issuance on the Closing Date,
will not be engraved but will be issued in the form of one or more printed or
typewritten Book-Entry Preferred Securities Certificates, to be delivered to The
Depository Trust Company, the initial Clearing Agency, by, or on behalf of, the
Trust.  Such Book-Entry Preferred Securities Certificate or Certificates shall
initially be registered on the Securities Register in the name of Cede & Co.,
the nominee of the initial Clearing Agency.

     (b) A single Common Securities Certificate representing the Common
Securities shall be issued to the Depositor in the form of a definitive Common
Securities Certificate.

     Section 5.12.  Definitive Preferred Securities Certificates.  If (a) the
Depositor advises the Trustees in writing that the Clearing Agency is no longer
willing or able to properly discharge its responsibilities with respect to the
Preferred Securities Certificates or the Clearing Agency is no longer registered
or in good standing under the Securities Exchange Act of 1934, as amended, or
other applicable statute or regulation, and the Depositor is unable to locate a
qualified successor within 90 days, (b) the Depositor at its option advises the
Trustees in writing that it elects to terminate the book-entry system through
the Clearing Agency or (c) an Event of Default occurs and is continuing, then
the Administrative Trustee shall issue Definitive Preferred Securities
Certificates.  Upon surrender to the Administrative Trustee of the Book-Entry
Preferred Securities Certificates by the Clearing Agency, accompanied by
registration instructions, the Administrative Trustee shall execute and deliver
the Definitive Preferred Securities Certificates in accordance with the
instructions of the Clearing Agency.  Neither the Securities Registrar nor the
Trustees shall be liable for any delay in delivery of such instructions and may
conclusively rely on, and shall be protected in relying on, such instructions.
The Definitive Preferred Securities Certificates shall be printed, lithographed
or engraved or may be produced in any other manner as is reasonably acceptable
to the Administrative Trustee, as evidenced by the execution thereof by the
Administrative Trustee.

     Section 5.13.  Rights of Securityholders.  The Securityholders shall not
have any right or title to the Trust Property other than the undivided
beneficial interest in the assets of the Trust conferred by their Trust
Securities and they shall have no right to call for any partition or division of
property, profits or rights of the Trust except as described below.  The Trust
Securities shall be personal property giving only the rights specifically set
forth therein and in this Declaration.  The Trust Securities shall have no
preemptive or similar rights and when issued and delivered to Securityholders
against payment of the purchase price therefor will be fully paid and
nonassessable by the Trust.  The Holders of the Trust Securities, in their
capacities as such, shall


                                      -23-
<PAGE>

be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware.

                                   ARTICLE VI

                    Acts of Securityholders; Meetings; Voting

     Section 6.01.  Limitations on Voting Rights.

     (a) Except as provided herein and in the Indenture and as otherwise
required by law, no Holder of Trust Securities shall have any right to vote or
in any manner otherwise control the administration, operation and management of
the Trust or the obligations of the parties hereto, nor shall anything herein
set forth, or contained in the terms of the Trust Securities Certificates, be
construed so as to constitute the Securityholders from time to time as partners
or members of an association.

     (b) The Trustees shall not (i) direct the time, method and place of
conducting any proceeding for any remedy available to the Debenture Trustee or
executing any trust or power conferred on the Debenture Trustee with respect to
such Debentures, (ii) waive any past default which may be waived under Section
513 of the Indenture, (iii) exercise any right to rescind or annul an
acceleration of the principal of all the Debentures or (iv) consent to any
amendment or modification of the Indenture, where such consent shall be
required, without, in each case, obtaining the prior consent of the Holders of
at least a majority in aggregate Liquidation Amount of all Outstanding Preferred
Securities; provided, however, that where such consent under the Indenture would
require the consent of each holder of Debentures affected thereby, no such
consent shall be given by the Property Trustee without the prior written consent
of each Holder of Outstanding Preferred Securities.  The Trustees shall not
revoke any action previously authorized or approved by a vote of the Holders of
Preferred Securities, except by a subsequent vote of the Holders of Preferred
Securities.  The Property Trustee shall notify all Holders of the Preferred
Securities of any notice received from the Debenture Trustee as a result of the
Trust being the holder of the Debentures.  In addition to obtaining the consent
of the Holders of the Preferred Securities, prior to taking any of the foregoing
actions, the Trustees shall, at the expense of the Depositor, obtain an Opinion
of Counsel experienced in such matters to the effect that the Trust will not be
classified as an association taxable as a corporation or partnership for United
States Federal income tax purposes on account of such action and will continue
to be classified as a grantor trust for United States Federal income tax
purposes.

     (c) Subject to Section 10.02(c) hereof, if any proposed amendment to the
Declaration provides for, or the Trustees otherwise propose to effect, (i) any
action that would adversely affect in any material respect the powers,
preferences or special rights of the Preferred Securities, whether by way of
amendment to this Declaration or otherwise, or (ii) dissolution of or
liquidation of the Trust, other than pursuant to the terms of this Declaration,
then the Holders of Outstanding Preferred Securities will be entitled to vote on
such amendment or proposal and such amendment or proposal shall not be effective
except with the approval of the Holders of at least a majority in aggregate
Liquidation Amount of the Outstanding Preferred Securities.


                                      -24-
<PAGE>


     Section 6.02.  Notice of Meetings.  Notice of all meetings of the Preferred
Securityholders, stating the time, place and purpose of the meeting, shall be
given by the Property Trustee pursuant to Section 10.10 to each Preferred
Securityholder of record, at his/her registered address, at least 15 days and
not more than 90 days before the meeting.  At any such meeting, any business
properly before the meeting may be so considered whether or not stated in the
notice of the meeting.  Any adjourned meeting may be held as adjourned without
further notice.

     Section 6.03.  Meetings of Preferred Securityholders.  No annual meeting of
Securityholders is required to be held.  The Administrative Trustee, however,
shall call a meeting of Securityholders to vote on any matter upon the written
request of the Holders of at least 25% of the aggregate Liquidation Amount of
the Outstanding Preferred Securities and the Administrative Trustee or the
Property Trustee may, at any time in their discretion, call a meeting of
Preferred Securityholders to vote on any matters as to which the Preferred
Securityholders are entitled to vote.

     Holders of at least 50% of the aggregate Liquidation Amount of the
Outstanding Preferred Securities, present in person or by proxy, shall
constitute a quorum at any meeting of Preferred Securityholders.

     If a quorum is present at a meeting, an affirmative vote of the Holders of
at least a majority of the aggregate Liquidation Amount of the Outstanding
Preferred Securities present, either in person or by proxy, at such meeting
shall constitute the action of the Preferred Securityholders, unless this
Declaration requires a greater number of affirmative votes.

     Section 6.04.  Voting Rights.  A Securityholder shall be entitled to one
vote for each Trust Security in respect of any matter as to which such
Securityholder is entitled to vote.

     Section 6.05.  Proxies, etc.  At any meeting of Securityholders, any
Securityholder entitled to vote thereat may vote by proxy, provided that no
proxy shall be voted at any meeting unless it shall have been placed on file
with the Administrative Trustee, or with such other officer or agent of the
Trust as the Administrative Trustee may direct, for verification prior to the
time at which such vote shall be taken.  Pursuant to a resolution of the
Property Trustee, proxies may be solicited in the name of the Property Trustee
or one or more officers of the Property Trustee.  Only Securityholders of record
shall be entitled to vote.  When Trust Securities are held jointly by several
Persons, any one of them may vote at any meeting in person or by proxy in
respect of such Trust Securities, but if more than one of them shall be present
at such meeting in person or by proxy, and such joint owners or their proxies so
present disagree as to any vote to be cast, such vote shall not be received in
respect of such Trust Securities.  A proxy purporting to be executed by or on
behalf of a Securityholder shall be deemed valid unless challenged at or prior
to its exercise, and the burden of proving invalidity shall rest on the
challenger.  No proxy shall be valid more than three years after its date of
execution.

     Section 6.06.  Securityholder Action by Written Consent.  Any action which
may be taken by Securityholders at a meeting may be taken without a meeting if
Holders of the proportion of the Outstanding Securities required to approve such
action shall consent to the action in writing.


                                      -25-
<PAGE>

     Section 6.07.  Record Date for Voting and Other Purposes.  For the purposes
of determining the Securityholders who are entitled to notice of and to vote at
any meeting or by written consent, or for the purpose of any other action, the
Administrative Trustee may from time to time fix a date, not more than 90 days
prior to the date of any meeting of Securityholders, as a record date for the
determination of the identity of the Securityholders for such purposes.

     Section 6.08.  Acts of Securityholders.  Any request, demand,
authorization, direction, notice, consent, waiver or other action provided or
permitted by this Declaration to be given, made or taken by Securityholders may
be embodied in and evidenced by one or more instruments of substantially similar
tenor signed by such Securityholders in person or by an agent duly appointed in
writing; and, except as otherwise expressly provided herein, such action shall
become effective when such instrument or instruments are delivered to the
Administrative Trustee.  Such instrument or instruments (and the action embodied
therein and evidenced thereby) are herein sometimes referred to as the "Act" of
the Securityholders 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 Declaration and (subject to Section 7.02)
conclusive, 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/her the execution thereof.  Where such execution
is by a signer acting in a capacity other than his/her individual capacity, such
certificate or affidavit shall also constitute sufficient proof of his/her
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 any Trustee receiving the same deems sufficient.

     The ownership of Trust Securities shall be proved by the Securities
Register.

     Any request, demand, authorization, direction, notice, consent, waiver or
other act of the Securityholder of any Trust Security shall bind every future
Securityholder of the same Trust Security and the Securityholder of every Trust
Security 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 Trustees or the Trust in reliance thereon, whether or not
notation of such action is made upon such Trust Security.

     Without limiting the foregoing, a Securityholder entitled hereunder to take
any action hereunder with regard to any particular Trust Security may do so with
regard to all or any part of the Liquidation Amount of such Trust Security 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 Liquidation Amount.

     If any dispute shall arise between the Securityholders and the
Administrative Trustee or among such Securityholders or Trustees with respect to
the authenticity, validity or binding nature of any request, demand,
authorization, direction, consent, waiver or other Act of such


                                      -26-
<PAGE>

Securityholder or Trustee under this Article VI, then the determination of such
matter by the Property Trustee shall be conclusive with respect to such matter.

     Section 6.09.  Inspection of Records.  Upon reasonable notice to the
Administrative Trustee and the Property Trustee, the records of the Trust shall
be open to inspection by Securityholders during normal business hours for any
purpose reasonably related to such Securityholder's interest as a
Securityholder.

                                   ARTICLE VII

                                  The Trustees

     Section 7.01.  Certain Duties and Responsibilities.

     (a) The duties and responsibilities of the Trustees shall be as provided by
this Declaration and, in the case of the Property Trustee, also by the Trust
Indenture Act.  The Property Trustee, other than during the occurrence and
continuance of an Event of Default, undertakes to perform only such duties as
are specifically set forth in this Declaration and, upon an Event of Default,
must exercise the same degree of care and skill as a prudent person would
exercise or use in the conduct of his/her own affairs.  The Trustees shall have
all the privileges, rights and immunities provided by the Delaware Business
Trust Act.  Notwithstanding the foregoing, no provision of this Declaration
shall require the Trustees to expend or risk their own funds or otherwise incur
any financial liability in the performance of any of their duties hereunder, or
in the exercise of any of their rights or powers, if they 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 Declaration relating to the
conduct or affecting the liability of or affording protection to the Trustees
shall be subject to the provisions of this Section.  Nothing in this Declaration
shall be construed to release the Property Trustee from liability for its own
negligent action, its own negligent failure to act, or its own willful
misconduct.  To the extent that, at law or in equity, the Administrative Trustee
has duties (including fiduciary duties) and liabilities relating thereto to the
Trust or to the Securityholders, the Administrative Trustee shall not be liable
to the Trust or to any Securityholder for the Administrative Trustee's good
faith reliance on the provisions of this Declaration.  The provisions of this
Declaration, to the extent that they restrict the duties and liabilities of the
Administrative Trustee otherwise existing at law or in equity, are agreed by the
Depositor and the Securityholders to replace such other duties and liabilities
of the Administrative Trustee.

     (b) All payments made by the Property Trustee or any other Paying Agent in
respect of the Trust Securities shall be made only from the income and proceeds
from the Trust Property.  Each Securityholder, by its acceptance of a Trust
Security, agrees that (i) it will look solely to the income and proceeds from
the Trust Property to the extent available for distribution to it as herein
provided and (ii) the Trustees are not personally liable to it for any amount
distributable in respect of any Trust Security or for any other liability in
respect of any Trust Security.  This Section 7.01(b) does not limit the
liability of the Trustees expressly set forth elsewhere in this Declaration or,
in the case of the Property Trustee, in the Trust Indenture Act.


                                      -27-
<PAGE>

     Section 7.02.  Notice of Defaults; Direct Action by Securityholders.
Within 90 days after the occurrence of any Event of Default actually known to
the Property Trustee, the Property Trustee shall transmit, in the manner and to
the extent provided in Section 10.10, notice of such Event of Default to the
Securityholders, the Administrative Trustee and the Depositor, unless such Event
of Default shall have been cured or waived.  If the Property Trustee has failed
to enforce its rights under this Declaration or the Indenture, to the fullest
extent permitted by law and subject to the terms of this Declaration and the
Indenture, any Securityholder may institute a legal proceeding directly against
any Person to enforce the Property Trustee's rights under this Declaration or
the Indenture with respect to Debentures having a principal amount equal to the
aggregate Liquidation Amount of the Preferred Securities of such Securityholder
without first instituting a legal proceeding against the Property Trustee or any
other Person.  To the extent that any action under the Indenture is entitled to
be taken by the holders of at least a specified percentage of the principal
amount of the outstanding Debentures, Holders of at least the same percentage of
the Liquidation Amount of the Outstanding Preferred Securities may also take
such action in the name of the Trust if such action has not been taken by the
Property Trustee.  Notwithstanding the foregoing, if a Debenture Event of
Default relating to the Depositor's failure to pay the principal of or interest
on the Debentures has occurred and is continuing thereby resulting in an Event
of Default hereunder, then each Holder of Preferred Securities may institute a
legal proceeding directly against the Depositor for enforcement of payment to
such Holder, as provided in Section 508 of the Indenture.

     Section 7.03.  Certain Rights of Property Trustee.  Subject to the
provisions of Section 7.01:

          (a) the Property Trustee may rely and shall be protected in acting or
     refraining from acting in good faith upon any resolution, Opinion of
     Counsel, certificate, written representation of a Holder or transferee,
     certificate of auditors or any other certificate, statement, instrument,
     opinion, report, notice, request, consent, order, appraisal, 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;

          (b) if, other than during the occurrence and continuance of an Event
     of Default, (i) in performing its duties under this Declaration, the
     Property Trustee is required to decide between alternative courses of
     action or (ii) in construing any of the provisions in this Declaration, the
     Property Trustee finds the same ambiguous or inconsistent with any other
     provisions contained herein or (iii) the Property Trustee is unsure of the
     application of any provision of this Declaration, then, except as to any
     matter as to which the Preferred Securityholders are entitled to vote under
     the terms of this Declaration, the Property Trustee shall deliver a notice
     to the Depositor requesting written instructions of the Depositor as to the
     course of action to be taken.  The Property Trustee shall take such action,
     or refrain from taking such action, as the Property Trustee shall be
     instructed in writing to take, or to refrain from taking, by the Depositor;
     provided, however, that if the Property Trustee does not receive such
     instructions of the Depositor within ten Business Days after it has
     delivered such notice, or such reasonably shorter period of time set forth
     in such notice (which to the extent practicable shall not be less than two
     Business Days), it


                                      -28-
<PAGE>

     may, but shall be under no duty to, take or refrain from taking such action
     not inconsistent with this Declaration as it shall deem advisable and in
     the best interests of the Securityholders, in which event the Property
     Trustee shall have no liability except for its own negligent action, its
     own negligent failure to act or its own willful misconduct;

          (c) the Property Trustee may consult with counsel or other experts of
     its selection and the advice or opinion of such counsel or other experts
     with respect to legal matters or advice within the scope of such experts'
     area of expertise 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;

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

          (e) the Property 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,
     approval, bond, debenture, note or other evidence of indebtedness or other
     paper or document, but the Property Trustee, in its discretion, may make
     such further inquiry or investigation into such facts or matters as it may
     see fit; and

          (f) the Property Trustee may execute any of the trusts or powers
     hereunder or perform any duties hereunder either directly or by or through
     its agents or attorneys and the Property 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.

     Section 7.04.  Not Responsible for Recitals or Issuance of Securities.  The
recitals contained herein and in the Trust Securities Certificates shall be
taken as the statements of the Trust, and the Trustees do not assume any
responsibility for their correctness.  The Trustees shall not be accountable for
the use or application by the Depositor of the proceeds of the Debentures.

     Section 7.05.  May Hold Securities.  Any Trustee or any other agent of any
Trustee or the Trust, in its individual or any other capacity, may become the
owner or pledgee of Trust Securities and, subject to Sections 7.08 and 7.13 and,
except as provided in the definition of the term Outstanding in Article I, may
otherwise deal with the Trust with the same rights it would have if it were not
a Trustee or such other agent.

     Section 7.06.  Compensation; Indemnity; Fees.

          (a) The Depositor agrees to pay to the Trustees from time to time such
     compensation as shall have been agreed in writing with the Depositor for
     all services


                                      -29-
<PAGE>

     rendered by them hereunder (which compensation shall not be limited by any
     provision of law in regard to the compensation of a trustee of an express
     trust).

          (b) The Depositor agrees, except as otherwise expressly provided
     herein, to reimburse the Trustees upon request for all reasonable expenses,
     disbursements and advances incurred or made by the Trustees in accordance
     with any provision of this Declaration (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 own negligent action, its own negligent failure to act or its own
     wilful misconduct (or, in the case of the Administrative Trustee, any such
     expense, disbursement or advance as may be attributable to his/her gross
     negligence).

          (c) The Depositor agrees to indemnify each of the Property and
     Delaware Trustees or any predecessor of such Trustee for, and to hold such
     Trustees harmless against, any and all loss, damage, claims, liability,
     penalty or expense including taxes (other than taxes based on the income of
     such Trustee) incurred without its own negligent action, its own negligent
     failure to act or its wilful misconduct, arising out of or in connection
     with the acceptance or administration of this Declaration, 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.

          (d)(i) The Depositor shall indemnify, to the full extent permitted by
     law, any Company Indemnified Person who was or is a party or is threatened
     to be made a party to any threatened, pending or completed action, suit or
     proceeding, whether civil, criminal, administrative or investigative (other
     than an action by or in the right of the Trust) by reason of the fact that
     he is or was a Company Indemnified Person against expenses (including
     attorneys' fees), judgments, fines and amounts paid in settlement actually
     and reasonably incurred by him in connection with such action, suit or
     proceeding if he acted in good faith and in a manner he reasonably believed
     to be in or not opposed to the best interests of the Trust, and, with
     respect to any criminal action or proceeding, had no reasonable cause to
     believe his conduct was unlawful.  The termination of any action, suit or
     proceeding by judgment, order, settlement, conviction, or upon a plea of
     NOLO CONTENDERE or its equivalent, shall not, of itself, create a
     presumption that the Company Indemnified Person did not act in good faith
     and in a manner which he reasonably believed to be in or not opposed to the
     best interests of the Trust, and, with respect to any criminal action or
     proceeding, had reasonable cause to believe that his conduct was unlawful;

          (ii)  The Depositor shall indemnify, to the full extent permitted by
     law, any Company Indemnified Person who was or is a party or is threatened
     to be made a party to any threatened, pending or completed action or suit
     by or in the right of the Trust to procure a judgment in its favor by
     reason of the fact that he is or was a Company Indemnified Person against
     expenses (including attorneys' fees) actually and reasonably incurred by
     him in connection with the defense or settlement of such action or suit if
     he acted in good faith and in a manner he reasonably believed to be in or
     not opposed to the best interests of the Trust and except that no such
     indemnification shall be made in respect


                                      -30-
<PAGE>

     of any claim, issue or matter as to which such Company Indemnified Person
     shall have been adjudged to be liable to the Trust unless and only to the
     extent that the Court of Chancery of Delaware or the court in which such
     action or suit was brought shall determine upon application that, despite
     the adjudication of liability but in view of all the circumstances of the
     case, such Person is fairly and reasonably entitled to indemnity for such
     expenses which such Court of Chancery or such other court shall deem
     proper;

          (iii) To the extent that a Company Indemnified Person shall be
     successful on the merits or otherwise (including dismissal of an action
     without prejudice or the settlement of an action without admission of
     liability) in defense of any action, suit or proceeding referred to in
     paragraphs (i) and (ii) of this Section 7.06(d), or in defense of any
     claim, issue or matter therein, he shall be indemnified, to the full extent
     permitted by law, against expenses (including attorneys' fees) actually and
     reasonably incurred by him in connection therewith.

          (iv)  Expenses (including attorneys' fees) incurred by a Company
     Indemnified Person in defending a civil, criminal, administrative or
     investigative action, suit or proceeding referred to in paragraphs (i) and
     (ii) of this Section 7.06(d) shall be paid by the Depositor in advance of
     the final disposition of such action, suit or proceeding upon receipt of an
     undertaking by or on behalf of such Company Indemnified Person to repay
     such amount if it shall ultimately be determined that he is not entitled to
     be indemnified by the Depositor as authorized in this Section 7.06(d).
     Notwithstanding the foregoing, no advance shall be made by the Depositor if
     a determination is reasonably and promptly made (i) by independent legal
     counsel in a written opinion or (ii) the Common Security Holder of the
     Trust, that, based upon the facts known to the counsel or the Common
     Security Holder at the time such determination is made, such Company
     Indemnified Person acted in bad faith or in a manner that such Person did
     not believe to be in or not opposed to the best interests of the Trust, or,
     with respect to any criminal proceeding, that such Company Indemnified
     Person believed or had reasonable cause to believe his conduct was
     unlawful.  In no event shall any advance be made in instances where the
     independent legal counsel or Common Security Holder reasonably determine
     that such person deliberately breached his duty to the Trust or its Common
     or Preferred Security Holders.

          (v)   The indemnification and advancement of expenses provided by, or
     granted pursuant to, the other paragraphs of this Section 7.06(d) shall not
     be deemed exclusive of any other rights to which those seeking
     indemnification and advancement of expenses may be entitled under any
     agreement, vote of stockholders or disinterested directors of the Depositor
     or Preferred Security Holders of the Trust or otherwise, both as to action
     in his official capacity and as to action in another capacity while holding
     such office.  All rights to indemnification under this Section 7.06(d)
     shall be deemed to be provided by a contract between the Depositor and each
     Company Indemnified Person who serves in such capacity at any time while
     this Section 7.06(d) is in effect.  Any repeal or modification of this
     Section 7.06(d) shall not affect any rights or obligations then existing.


                                      -31-
<PAGE>

          (vi)  The Depositor or the Trust may purchase and maintain insurance
     on behalf of any person who is or was a Company Indemnified Person against
     any liability asserted against him and incurred by him in any such
     capacity, or arising out of his status as such, whether or not the
     Debenture Issuer would have the power to indemnify him against such
     liability under the provisions of this Section 7.06(d).

          (vii) The indemnification and advancement of expenses provided by, or
     granted pursuant to, this Section 7.06(d) shall, unless otherwise provided
     when authorized or ratified, continue as to a Person who has ceased to be a
     Company Indemnified Person and shall inure to the benefit of the heirs,
     executors and administrators of such a Person.

     No Trustee may claim any Lien or charge on any Trust Property as a result
of any amount due pursuant to this Section 7.06.

     The provisions of this Section 7.06 shall survive the termination of this
Declaration.

     Section 7.07.  Corporate Property Trustee Required; Eligibility of
Trustees.

     (a) There shall at all times be a Property Trustee hereunder.  The Property
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, 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 Property Trustee
with respect to the Trust Securities 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.

     (b) There shall at all times be one or more Administrative Trustees
hereunder.  Each Administrative Trustee shall be either a natural person who is
at least 21 years of age or a legal entity that shall act through one or more
persons authorized to bind that entity.

     (c) There shall at all times be a Delaware Trustee.  The Delaware Trustee
shall either be (i) a natural person who is at least 21 years of age and a
resident of the State of Delaware or (ii) a legal entity with its principal
place of business in the State of Delaware and that otherwise meets the
requirements of applicable Delaware law that shall act through one or more
persons authorized to bind such entity.

     Section 7.08.  Conflicting Interests.  If the Property Trustee has or shall
acquire a conflicting interest within the meaning of the Trust Indenture Act,
the Property 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 Declaration.

     Section 7.09.  Co-Trustees and Separate Trustee.  Unless an Event of
Default shall have occurred and be continuing, at any time or times, for the
purpose of meeting the legal


                                      -32-
<PAGE>

requirements of the Trust Indenture Act or of any jurisdiction in which any part
of the Trust Property may at the time be located, the Depositor and the
Administrative Trustee (and if more than one Administrative Trustee, by agreed
action of the majority of such Trustees) shall have power (i) to appoint, and
upon the written request of the Administrative Trustee the Depositor shall for
such purpose join with the Administrative Trustee in the execution, delivery,
and performance of all instruments and agreements necessary or proper to appoint
one or more Persons approved by the Property Trustee either to act as co-
trustee, jointly with the Property Trustee, of all or any part of such Trust
Property, or to the extent required by law to act as separate trustee of any
such property, in either case with such powers as may be provided in the
instrument of appointment, and (ii) to vest in such Person or Persons in the
capacity aforesaid, any property, title, right or power deemed necessary or
desirable, subject to the other provisions of this Section.  If the Depositor
does not join in such appointment within 15 days after the receipt by it of a
request so to do, or in case a Debenture Event of Default has occurred and is
continuing, the Property Trustee alone shall have power to make such
appointment.  Any co-trustee or separate trustee appointed pursuant to this
Section shall either be (i) a natural person who is at least 21 years of age and
a resident of the United States or (ii) a legal entity with its principal place
of business in the United States that shall act through one or more persons
authorized to bind such entity.

     Should any written instrument from the Depositor be required by any co-
trustee or separate trustee so appointed for more fully confirming to such co-
trustee or separate trustee such property, title, right, or power, any and all
such instruments shall, on request, be executed, acknowledged, and delivered by
the Depositor.

     Every co-trustee or separate trustee shall, to the extent permitted by law,
but to such extent only, be appointed subject to the following terms, namely:

          (a) The Trust Securities shall be executed and delivered and all
     rights, powers, duties, and obligations hereunder in respect of the custody
     of securities, cash and other personal property held by, or required to be
     deposited or pledged with, the Trustees specified hereunder, shall be
     exercised, solely by such Trustees and not by such co-trustee or separate
     trustee.

          The rights, powers, duties, and obligations hereby conferred or
     imposed upon the Property Trustee in respect of any property covered by
     such appointment shall be conferred or imposed upon and exercised or
     performed by the Property Trustee or by the Property Trustee and such co-
     trustee or separate trustee jointly, as shall be provided in the instrument
     appointing such co-trustee or separate trustee, except to the extent that
     under any law of any jurisdiction in which any particular act is to be
     performed, the Property Trustee shall be incompetent or unqualified to
     perform such act, in which event such rights, powers, duties and
     obligations shall be exercised and performed by such co-trustee or separate
     trustee.

          (b) The Property Trustee at any time, by an instrument in writing
     executed by it, with the written concurrence of the Depositor, may accept
     the resignation of or remove


                                      -33-
<PAGE>

     any co-trustee or separate trustee appointed under this Section, and, in
     case a Debenture Event of Default has occurred and is continuing, the
     Property Trustee shall have power to accept the resignation of, or remove,
     any such co-trustee or separate trustee without the concurrence of the
     Depositor.  Upon the written request of the Property Trustee, the Depositor
     shall join with the Property Trustee in the execution, delivery, and
     performance of all instruments and agreements necessary or proper to
     effectuate such resignation or removal.  A successor to any co-trustee or
     separate trustee so resigned or removed may be appointed in the manner
     provided in this Section 7.09.

          (c) No co-trustee or separate trustee hereunder shall be personally
     liable by reason of any act or omission of the Property Trustee, or any
     other trustee hereunder.

          (d) The Property Trustee shall not be liable by reason of any act of a
     co-trustee or separate trustee.

          (e)  Any Act of Holders delivered to the Property Trustee shall be
     deemed to have been delivered to each such co-trustee and separate trustee.

     Section 7.10.  Resignation and Removal; Appointment of Successor.  No
resignation or removal of any 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 7.11.

     Subject to the immediately preceding paragraph, any Trustee may resign at
any time with respect to the Trust Securities by giving written notice thereof
to the Securityholders.

     Unless an Event of Default shall have occurred and be continuing, any
Trustee may be removed at any time by Act of the Holder of the Common
Securities.  If an Event of Default shall have occurred and be continuing, the
Property Trustee or the Delaware Trustee, or both of them, may be removed at
such time only by Act of the Holders of at least a majority in Liquidation
Amount of the Outstanding Preferred Securities, delivered to such Trustee (in
its individual capacity and on behalf of the Trust).  The Administrative Trustee
may only be removed by the Holder of Common Securities at any time.

     If the instrument of acceptance by the successor Trustee required by
Section 7.11 shall not have been delivered to the Trustee within 30 days after
the giving of such notice of resignation or removal, the Trustee may petition,
at the expense of the Depositor, any court of competent jurisdiction for the
appointment of a successor Trustee.

     If any Trustee shall resign, be removed or become incapable of acting as
Trustee, or if a vacancy shall occur in the office of any Trustee for any cause,
at a time when no Event of Default shall have occurred and be continuing, the
Holder of Common Securities, by Act of the Holder of Common Securities delivered
to the retiring Trustee, shall promptly appoint a successor Trustee or Trustees
and the Trust, and the retiring Trustee shall comply with the applicable
requirements of Section 7.11.  If the Property Trustee or the Delaware Trustee
shall resign, be removed or


                                      -34-
<PAGE>

become incapable of continuing to act as the Property Trustee or the Delaware
Trustee, as the case may be, at a time when an Event of Default has occurred and
is continuing, the Holders of Preferred Securities, by Act of the
Securityholders of at least a majority in Liquidation Amount of the Outstanding
Preferred Securities delivered to the retiring Trustee, shall promptly appoint a
successor Trustee or Trustees, and such successor Trustee shall comply with the
applicable requirements of Section 7.11.  If any Administrative Trustee shall
resign, be removed or become incapable of acting as Administrative Trustee at a
time when an Event of Default shall have occurred and be continuing, the Holder
of Common Securities shall appoint a successor Administrative Trustee.  If no
successor Trustee shall have been so appointed by the Holder of Common
Securities or the Holders of Preferred Securities and accepted appointment in
the manner required by Section 7.11, any Securityholder who has been a
Securityholder of Trust Securities 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.

     The Property Trustee shall give notice of each resignation and each removal
of a Trustee and each appointment of a successor Trustee to all Securityholders
in the manner provided in Section 10.10 and shall give notice to the Depositor.
Each notice shall include the name of the successor Trustee and the address of
its Corporate Trust Office if it is the Property Trustee.

     Notwithstanding the foregoing or any other provision of this Declaration,
in the event any Administrative Trustee or Delaware Trustee who is a natural
person dies or becomes, in the opinion of the Depositor, incompetent or
incapacitated, the vacancy created by such death, incompetence or incapacity may
be filled by (a) the unanimous act of the remaining Administrative Trustees if
there are at least two of them or (b) otherwise by the Depositor (with the
successor in each case being a Person who satisfies the eligibility requirements
for Administrative Trustee or for the Delaware Trustee, as the case may be, set
forth in Section 7.07).

     Section 7.11.  Acceptance of Appointment by Successor.  In case of the
appointment hereunder of a successor Trustee, the retiring Trustee and each
successor Trustee shall execute and deliver to the Trust and the retiring
Trustee an amendment hereto wherein each successor Trustee shall accept such
appointment and which (a) 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 and (b) shall add
to or change any of the provisions of this Declaration 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 amendment
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 amendment 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 and the Trust; but, on request of the Trust or any successor Trustee,
such retiring Trustee shall duly assign, transfer and deliver to such successor
Trustee all Trust Property, all proceeds thereof and money held by such retiring
Trustee hereunder.


                                      -35-
<PAGE>

     Upon request of any such successor Trustee, the Trust 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 7.12.  Merger, Conversion, Consolidation or Succession to Business.
Any Person into which any of the Trustees may be merged or converted or with
which it may be consolidated, or any Person resulting from any merger,
conversion or consolidation to which such Trustee shall be a party, or any
Person succeeding to all or substantially all the corporate trust business of
such Trustee, shall be the successor of such Trustee hereunder, provided such
Person 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.

     Section 7.13.  Preferential Collection of Claims Against Depositor or
Trust.  If and when the Property Trustee or the Delaware Trustee shall be or
become a creditor (whether directly or indirectly, secured or unsecured) of the
Depositor or the Trust (or any other obligor upon the Debentures or the Trust
Securities), including under the terms of Section 7.05 hereof, the Property
Trustee or the Delaware Trustee, as the case may be, shall be subject to and
shall take all actions necessary in order to comply with the provisions of the
Trust Indenture Act regarding the collection of claims against the Depositor or
Trust (or any such other obligor).

     Section 7.14.  Reports by Property Trustee.  The Property Trustee shall
transmit to Holders such reports concerning the Property Trustee and its actions
under this Declaration 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 Property Trustee shall, within 60 days
after each May 31 following the date of this Declaration deliver to Holders a
brief report, dated as of such May 31, which complies with the provisions of
such Section 313(a).

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

     Section 7.15.  Reports to the Property Trustee.  The Depositor and the
Administrative Trustee on behalf of the Trust shall provide to the Property
Trustee such documents, reports and information as required by Section 314 of
the Trust Indenture Act (if any) and the compliance certificate required by
Section 314(a) of the Trust Indenture Act in the form, in the manner and at the
times required by Section 314 of the Trust Indenture Act.

     Section 7.16.  Evidence of Compliance with Conditions Precedent.  The
Depositor and the Administrative Trustee on behalf of the Trust shall provide to
the Property Trustee evidence of


                                      -36-
<PAGE>

compliance with the conditions precedent, if any, provided for in this
Declaration that relate to any of the matters set forth in Section 314(c) of the
Trust Indenture Act.

     Section 7.17.  Statements Required in Officers' Certificate and Opinion of
Counsel.

     Each Officers' Certificate and Opinion of Counsel with respect to
compliance with a covenant or condition provided for in this Declaration shall
include:

          (1)  a statement that each Person making such Officers' Certificate or
     Opinion of Counsel has read such covenant or condition;

          (2)  a brief statement as to the nature and scope of the examination
     or investigation upon which the statements or opinions contained in such
     Officers' Certificate or Opinion of Counsel are based;

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

          (4)  a statement that, in the opinion of such Person, such covenant or
     condition has been complied with; provided, however, that with respect to
     matters of fact not involving any legal conclusion, an Opinion of Counsel
     may rely on an Officers' Certificate or certificates of public officials.

     Section 7.18.  Number of Trustees.

     (a) The number of Trustees shall be three, provided that the Holder of all
of the Common Securities by written instrument may increase and, if increased,
may decrease the number of Administrative Trustees.

     (b) If a Trustee ceases to hold office for any reason and the number of
Administrative Trustees is not reduced pursuant to Section 7.18(a), or if the
number of Trustees is increased pursuant to Section 7.18(a), a vacancy shall
occur.  The vacancy shall be filled with a Trustee appointed in accordance with
Section 7.10.

     (c) The death, resignation, retirement, removal, bankruptcy, dissolution,
termination, incompetence or incapacity to perform the duties of a Trustee shall
not operate to dissolve, terminate or annul the Trust.  Whenever a vacancy shall
occur, until such vacancy is filled by the appointment of an Administrative
Trustee in accordance with Section 7.10, the Administrative Trustees in office,
regardless of their number (and notwithstanding any other provision of this
Declaration), shall have all the powers granted to the Administrative Trustee
and shall discharge all the duties imposed upon the Administrative Trustees by
this Declaration.


                                      -37-
<PAGE>

     Section 7.19.  Delegation of Power.

     (a) Any Administrative Trustee may, by power of attorney consistent with
applicable law, delegate to any natural person over the age of 21 his or her
power for the purpose of executing any documents contemplated in Section
2.07(a), including any registration statement or amendment thereto filed with
the Commission, or making any other governmental filing; and

     (b) the Administrative Trustees shall have power to delegate from time to
time to such of their number, if there is more than one Administrative Trustee,
or to the Depositor the doing of such things and the execution of such
instruments either in the name of the Trust or the names of the Administrative
Trustees or otherwise as the Administrative Trustees may deem expedient, to the
extent such delegation is not prohibited by applicable law or contrary to the
provisions of the Trust, as set forth herein.

     Section 7.20.  Voting.  Except as otherwise provided in this Declaration,
the consent or vote of the Trustees shall be approved by not less than a
majority of the Administrative Trustees.

                                  ARTICLE VIII

                           Dissolution and Liquidation

     Section 8.01.  Dissolution Upon Expiration Date.  Unless earlier dissolved,
the Trust shall automatically dissolve on February 27, 2053 (the "Expiration
Date").

     Section 8.02.  Early Dissolution.  The earliest to occur of any of the
following events is an "Early Dissolution Event" upon the occurrence of which
the Trust shall be dissolved:

          (a) the occurrence of a Bankruptcy Event in respect of, or the
     dissolution or liquidation of the Depositor or an acceleration of the
     maturity of the Debentures pursuant to Section 502 of the Indenture;

          (b) upon the election of the Depositor to liquidate the Trust and
     cause the distribution of a Like Amount of Debentures to the Holders of the
     Trust Securities;

          (c) the redemption of all of the Trust Securities; and

          (d) an order for dissolution of the Trust shall have been entered by a
     court of competent jurisdiction.

     The election of the Depositor pursuant to Section 8.02(b) shall be made by
the Depositor giving written notice to the Trustees not less than 30 days prior
to the date of distribution of the Debentures.  Such notice shall specify the
date of distribution of the Debentures and shall be accompanied by an Opinion of
Counsel that such event will not be a taxable event to the Holders of the Trust
Securities for Federal income tax purposes.


                                      -38-
<PAGE>

     Section 8.03.  Dissolution.  The respective obligations and
responsibilities of the Trustees and the Trust continued hereby shall terminate
upon the latest to occur of the following: (a) the distribution by the Property
Trustee to Securityholders upon the liquidation of the Trust pursuant to Section
8.04, or upon the redemption of all of the Trust Securities pursuant to Section
4.02, of all amounts required to be distributed hereunder upon the final payment
of the Trust Securities; (b) the payment of any expenses owed by the Trust; and
(c) the discharge of all administrative duties of the Administrative Trustee,
including the performance of any tax reporting obligations with respect to the
Trust or the Securityholders.

     Section 8.04.  Liquidation.

     (a) If an Early Dissolution Event specified in clause (a), (c) or (d) of
Section 8.02 occurs or upon the Expiration Date, the Trust shall be liquidated
by the Trustees as expeditiously as the Trustees determine to be possible by
distributing, after satisfaction of liabilities to creditors of the Trust as
provided by applicable law, to each Securityholder a Like Amount of Debentures,
subject to Section 8.04(d).  If an Early Dissolution Event specified in clause
(b) occurs, the Trust shall be liquidated by the Trustee on the date of
distribution of the Debentures specified by the Depositor in its notice
delivered pursuant to Section 8.02.  Notice of liquidation shall be given by the
Property Trustee by first-class mail, postage prepaid, mailed not later than 30
nor more than 60 days prior to the Liquidation Date to each Holder of Trust
Securities at such Holder's address appearing in the Securities Register.  All
notices of liquidation shall:

          (i)   state the Liquidation Date;

          (ii)  state that from and after the Liquidation Date, the Trust
     Securities will no longer be deemed to be Outstanding and any Trust
     Securities Certificates not surrendered for exchange will be deemed to
     represent a Like Amount of Debentures; and

          (iii) provide such information with respect to the mechanics by which
     Holders may exchange Trust Securities Certificates for certificates
     evidencing Debentures, or, if Section 8.04(d) applies, receive a
     Liquidation Distribution, as the Administrative Trustee or the Property
     Trustee shall deem appropriate.

     (b) In order to effect the liquidation of the Trust and distribution of the
Debentures to Securityholders, the Property Trustee, either itself acting as
exchange agent or through the appointment of a separate exchange agent, shall
establish such procedures as it shall deem appropriate to effect the
distribution of Debentures in exchange for the Outstanding Trust Securities
Certificates.

     (c) Except where Section 8.02(c) or 8.04(d) applies, on or after the
Liquidation Date, (i) the Trust Securities will no longer be deemed to be
Outstanding, (ii) certificates representing a Like Amount of Debentures will be
issued to Holders of Trust Securities Certificates, upon surrender of such
certificates to the Administrative Trustee or its agent for exchange, (iii) the
Depositor shall use its best efforts to have the Debentures listed on the New
York Stock Exchange or such other exchange as the Preferred Securities are then
listed and shall take any


                                      -39-
<PAGE>

reasonable action necessary to effect the distribution of the Debentures, (iv)
any Trust Securities Certificates not so surrendered for exchange will be deemed
to represent a Like Amount of Debentures, accruing interest at the rate provided
for in the Debentures from the last Distribution Date on which a Distribution
was made on such Trust Securities Certificates until such certificates are so
surrendered (and until such certificates are so surrendered, no payments or
interest or principal will be made to Holders of Trust Securities Certificates
with respect to such Debentures) and (v) all rights of Securityholders holding
Trust Securities will cease, except the right of such Securityholders to receive
Debentures upon surrender of Trust Securities Certificates.

     (d) In the event that, notwithstanding the other provisions of this
Section 8.04, whether because of an order for dissolution entered by a court of
competent jurisdiction or otherwise, distribution of the Debentures in the
manner provided herein is determined by the Property Trustee not to be
practical, the Trust Property shall be liquidated, and the Trust shall be
dissolved, by the Property Trustee in such manner as the Property Trustee
determines.  In such event, on the date of the dissolution of the Trust,
Securityholders will be entitled to receive out of the assets of the Trust
available for distribution to Securityholders, after satisfaction of liabilities
to creditors of the Trust as provided by applicable law, an amount equal to the
Liquidation Amount per Trust Security plus accumulated and unpaid Distributions
thereon to the date of payment (such amount being the "Liquidation
Distribution").  If, upon any such dissolution, the Liquidation Distribution can
be paid only in part because the Trust has insufficient assets available to pay
in full the aggregate Liquidation Distribution, then, subject to the next
succeeding sentence, the amounts payable by the Trust on the Trust Securities
shall be paid on a pro rata basis (based upon Liquidation Amounts).  The Holder
of the Common Securities will be entitled to receive Liquidation Distributions
upon any such dissolution pro rata (determined as aforesaid) with Holders of
Preferred Securities, except that, if a Debenture Event of Default has occurred
and is continuing, the Preferred Securities shall have a priority over the
Common Securities, and no Liquidation Distribution will be paid to the Holders
of the Common Securities unless and until receipt by all Holders of the
Preferred Securities of the entire Liquidation Distribution payable in respect
thereof.

                                   ARTICLE IX

                                  Mergers, Etc.

     Section 9.01.  Mergers, Consolidations, Amalgamations or Replacements of
the Trust.  The Trust may not merge with or into, consolidate, amalgamate, or be
replaced by, or convey, transfer or lease its properties and assets as an
entirety or substantially as an entirety to any Person except as described below
or under Article VIII.  The Trust may, at the request of the Depositor, with the
consent of the Administrative Trustee and without the consent of the Holders of
the Preferred Securities, merge with or into, consolidate, amalgamate, or be
replaced by, a trust organized as such under the laws of any State; provided,
that (i) such successor entity either (a) expressly assumes all of the
obligations of the Trust with respect to the Preferred Securities or (b)
substitutes for the Preferred Securities other securities having substantially
the same terms as the Preferred Securities (the "Successor Securities") so long
as the Successor Securities rank the same as the Preferred Securities rank with
respect to the payment of Distributions and payments


                                      -40-
<PAGE>

upon liquidation and redemption, (ii) the Depositor expressly appoints a trustee
of such successor entity possessing the same powers and duties as the Property
Trustee with respect to the Debentures, (iii) the Successor Securities are
listed, or any Successor Securities will be listed upon notification of
issuance, on any national securities exchange or other organization on which the
Preferred Securities are then listed, (iv) such merger, consolidation,
amalgamation or replacement does not cause the Preferred Securities (including
any Successor Securities) to be downgraded by any nationally recognized
statistical rating organization, (v) such merger, consolidation, amalgamation or
replacement does not adversely affect the rights, preferences and privileges of
the Holders of the Preferred Securities (including any Successor Securities) in
any material respect, (vi) such successor entity has a purpose substantially
similar to that of the Trust, (vii) prior to such merger, consolidation,
amalgamation or replacement, the Depositor has received an Opinion of Counsel to
the effect that (a) such merger, consolidation, amalgamation or replacement does
not adversely affect the rights, preferences and privileges of the Holders of
the Preferred Securities (including any Successor Securities) in any material
respect, and (b) following such merger, consolidation, amalgamation or
replacement, neither the Trust nor such successor entity will be required to
register as an Investment Company and (viii) the Depositor or any permitted
successor assignee owns all of the common securities of such successor entity
and guarantees the obligations of such successor entity under the Successor
Securities at least to the extent provided by the Guarantee and this
Declaration.  Notwithstanding the foregoing, the Trust shall not, except with
the consent of all Holders of the Preferred Securities, merge with or into,
consolidate, amalgamate, or be replaced by, any other entity or permit any other
entity to consolidate, amalgamate, merge with or into, or replace it if such
consolidation, amalgamation, merger or replacement would cause the Trust or the
successor entity not to be classified as a grantor trust for United States
Federal income tax purposes.

                                    ARTICLE X

                            Miscellaneous Provisions

     Section 10.01.  Limitation of Rights of Securityholders.  The death or
incapacity, bankruptcy, dissolution and termination of any Person having an
interest, beneficial or otherwise, in Trust Securities shall not operate to
terminate this Declaration, or dissolve, terminate or annul the Trust, nor
entitle the legal representatives or heirs of such Person or any Securityholder
for such Person, to claim an accounting, take any action or bring any proceeding
in any court for a partition or winding-up of the arrangements contemplated
hereby, nor otherwise affect the rights, obligations and liabilities of the
parties hereto or any of them.

     Section 10.02.  Amendment.

     (a) This Declaration may be amended from time to time by the Trustees and
the Depositor, without the consent of any Securityholders, to cure any
ambiguity, defect or inconsistency or make any other change which does not
adversely affect in any material respect the interests of any Holder of
Preferred Securities.  Any amendments of this Declaration pursuant to Section
10.02(a) shall become effective when notice thereof is given to the
Securityholders.


                                      -41-
<PAGE>

     (b) Except as provided in Section 10.02(a) and 10.02(c) hereof, any
provision of this Declaration may be amended by the Trustees and the Depositor
with the consent of Holders of at least a majority of the aggregate Liquidation
Amount of the Outstanding Preferred Securities.

     (c) In addition to and notwithstanding any other provision in this
Declaration, without the consent of each affected Securityholder (such consent
being obtained in accordance with Section 6.03 or 6.06 hereof), this Declaration
may not be amended to (i) change the amount, timing or currency of any
Distribution or Liquidation Distribution on the Trust Securities or otherwise
adversely affect the method of payment of any Distribution or Liquidation
Distribution required to be made in respect of the Trust Securities as of a
specified date; (ii) change the redemption provisions of the Trust Securities;
(iii) restrict the right of a Securityholder to institute suit for the
enforcement of any such payment contemplated in (i) or (ii) above on or after
the related date; (iv) modify the first sentence of Section 2.06(a) hereof; (v)
authorize or issue any beneficial interest in the Trust other than as
contemplated by this Declaration as of the date hereof; (vi) change the
conditions precedent for the Depositor to elect to dissolve the Trust and
distribute the Debentures to Holders of Trust Securities as set forth in Section
8.02; or (vii) affect the limited liability of any Holder of Preferred
Securities, and, notwithstanding any other provision herein, without the
unanimous consent of the Securityholders (such consent being obtained in
accordance with Section 6.03 or 6.06 hereof), paragraphs (b) and (c) of this
Section 10.02 may not be amended.

     (d) Notwithstanding any other provisions of this Declaration, no amendment
to this Declaration shall be made without receipt by the Trust of an Opinion of
Counsel experienced in such matters to the effect that such amendment will not
affect the Trust's status as a grantor trust for United States Federal income
tax purposes or its exemption from regulation as an Investment Company.

     (e) Notwithstanding anything in this Declaration to the contrary, without
the consent of the Depositor, this Declaration may not be amended in a manner
which imposes any additional obligation on the Depositor.

     (f) In the event that any amendment to this Declaration is made, the
Administrative Trustee shall promptly provide to the Depositor a copy of such
amendment.

     (g) In executing any amendment to this Declaration, the Property Trustee
shall be entitled to receive, and (subject to Section 7.01) shall be fully
protected in relying upon, an Opinion of Counsel stating that the execution of
such amendment is authorized or permitted by this Declaration.  Except as
contemplated by Section 7.11, a Trustee may, but shall not be obligated to,
enter into any amendment to this Declaration which affects the Trustee's own
rights, duties or immunities under this Declaration or otherwise.

     Section 10.03.  Severability.  In case any provision in this Declaration or
in the Trust Securities Certificates 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.


                                      -42-
<PAGE>

     Section 10.04.  Fiscal Year.  The fiscal year ("Fiscal Year") of the Trust
shall be the calendar year, or such other year as is required by the Code.

     Section 10.05.  Certain Accounting Matters.  At all times during the
existence of the Trust, the Administrative Trustee shall keep, or cause to be
kept, full books of account, records and supporting documents, which shall
reflect in reasonable detail, each transaction of the Trust.  The books of
account shall be maintained on the accrual method of accounting, in accordance
with generally accepted accounting principles, consistently applied.  The Trust
shall use the accrual method of accounting for United States federal income tax
purposes.  The books of account and the records of the Trust shall be examined
by and reported upon as of the end of each Fiscal Year of the Trust by a firm of
independent certified public accountants selected by the Administrative Trustee.

     Section 10.06.  Governing Law.  THIS DECLARATION AND THE RIGHTS AND
OBLIGATIONS OF EACH OF THE SECURITYHOLDERS, THE TRUST AND THE TRUSTEES WITH
RESPECT TO THIS DECLARATION AND THE TRUST SECURITIES SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF DELAWARE, WITHOUT
REGARD TO CONFLICT OF LAWS PRINCIPLES.

     Section 10.07.  Payments Due on Non-Business Day.  If the date fixed for
any payment on any Trust Security shall be a day which is not a Business Day,
then such payment need not be made on such date but may be made on the next
succeeding day which is a Business Day (except as otherwise provided herein,
with the same force and effect as though made on the date fixed for such
payment), and no interest shall accumulate thereon for the period after such
date to the date of payment on such succeeding day.

     Section 10.08.  Successors and Assigns.  This Declaration shall be binding
upon and shall inure to the benefit of any successor to the Trust or successor
Trustee or both, including any successor by operation of law.  Except in
connection with a consolidation, merger or sale involving the Depositor that is
permitted under Article Eight of the Indenture and pursuant to which the
assignee agrees in writing to perform the Depositor's obligations hereunder, the
Depositor shall not assign its obligations hereunder.

     Section 10.09.  Headings.  The Article and Section headings are for
convenience only and shall not affect the construction of this Declaration.

     Section 10.10.  Reports, Notices and Demands.  Any report, notice, demand
or other communication which by any provision of this Declaration is required or
permitted to be given or served to or upon any Securityholder or the Depositor
may be given or served in writing by deposit thereof, first-class postage
prepaid in the United States mail, hand delivery or facsimile transmission, in
each case, addressed, (a) in the case of a Holder of a Preferred Security, to
such Holder of a Preferred Security as such Securityholder's name and address
may appear on the Securities Register; and (b) in the case of the Holder of a
Common Security or the Depositor, to Public Service Company of Colorado, 1225
17th Street, Denver Colorado 80202, Attention:


                                      -43-
<PAGE>

General Counsel, facsimile no.:  (303)294-8815.  Such notice, demand or other
communication to or upon a Securityholder or the Depositor shall be deemed to
have been sufficiently given or made, for all purposes, upon hand delivery,
mailing or transmission.

     Any notice, demand or other communication which by any provision of this
Declaration is required or permitted to be given or served to or upon the Trust,
the Property Trustee or the Administrative Trustee shall be given in writing
addressed (until another address is published by the Trust) as follows: (a) with
respect to the Property Trustee to The Bank of New York, 101 Barclay Street,
Floor 21 West, New York, New York, Attention: Corporate Trust Office; (b) with
respect to the Delaware Trustee to The Bank of New York (Delaware), White Clay
Center, Route 273, Newark, Delaware 19711, Attention: Corporate Trust
Department; and (c) with respect to the Administrative Trustee, to the address
above for notices to the Depositor, marked "Attention: Administrative Trustee of
PSCO Capital Trust I c/o General Counsel."  Such notice, demand or other
communication to or upon the Trust, the Delaware Trustee or the Property Trustee
shall be deemed to have been sufficiently given or made only upon actual receipt
of the writing by the Trust, the Delaware Trustee or the Property Trustee.

     Section 10.11.  Agreement Not to Petition.  Each of the Trustees and the
Depositor agree for the benefit of the Securityholders that, until at least one
year and one day after the Trust has been terminated in accordance with Article
VIII, they shall not file, or join in the filing of, a petition against the
Trust under any Bankruptcy Laws or otherwise join in the commencement of any
proceeding against the Trust under any Bankruptcy Law.  In the event the
Depositor or any of the Trustees takes action in violation of this Section
10.11, the Property Trustee agrees, for the benefit of Securityholders, that at
the expense of the Depositor, it shall file an answer with the bankruptcy court
or otherwise properly contest the filing of such petition by the Depositor or
any of the Trustees, as applicable, against the Trust or the commencement of
such action and raise the defense that the Depositor or Trustee, as applicable,
has agreed in writing not to take such action and should be stopped and
precluded therefrom and such other defenses, if any, as counsel for the Property
Trustee or the Trust may assert.  The provisions of this Section 10.11 shall
survive the termination of this Declaration.

     Section 10.12.  Trust Indenture Act; Conflict with Trust Indenture Act.

     (a) This Declaration is subject to the provisions of the Trust Indenture
Act that are required to be part of this Declaration and shall, to the extent
applicable, be governed by such provisions.

     (b) The Property Trustee shall be the only Trustee which is a trustee for
the purposes of the Trust Indenture Act.

     (c) If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Declaration by any of
the provisions of the Trust Indenture Act, such required provision shall
control.  If any provision of this Declaration modifies or excludes any
provision of the Trust Indenture Act which may be so modified or excluded, the
latter


                                      -44-
<PAGE>

provision shall be deemed to apply to this Declaration as so modified or
excluded, as the case may be.

     (d) The application of the Trust Indenture Act to this Declaration shall
not affect the nature of the Trust Securities as equity securities representing
undivided beneficial interests in the assets of the Trust.

     Section 10.13.  Acceptance of Terms of Declaration, Guarantee and
Indenture.  THE RECEIPT AND ACCEPTANCE OF A TRUST SECURITY OR ANY INTEREST
THEREIN BY OR ON BEHALF OF A SECURITYHOLDER OR ANY BENEFICIAL OWNER, WITHOUT ANY
SIGNATURE OR FURTHER MANIFESTATION OF ASSENT, SHALL CONSTITUTE THE UNCONDITIONAL
ACCEPTANCE BY THE SECURITYHOLDER AND ALL OTHERS HAVING A BENEFICIAL INTEREST IN
SUCH TRUST SECURITY OF ALL THE TERMS AND PROVISIONS OF THIS DECLARATION AND
AGREEMENT TO THE SUBORDINATION PROVISIONS AND OTHER TERMS OF THE GUARANTEE AND
THE INDENTURE, AND SHALL CONSTITUTE THE AGREEMENT OF THE TRUST, SUCH
SECURITYHOLDER AND SUCH OTHERS THAT THE TERMS AND PROVISIONS OF THIS DECLARATION
SHALL BE BINDING, OPERATIVE AND EFFECTIVE AS BETWEEN THE TRUST AND SUCH
SECURITYHOLDER AND SUCH OTHERS.

                                   ARTICLE XI

            Representations of Property Trustee and Delaware Trustee

     Section 11.01.  Representations and Warranties of Property Trustee.  The
Trustee that acts as initial Property Trustee represents and warrants to the
Trust and to the Depositor at the date of this Declaration, and each Successor
Property Trustee represents and warrants to the Trust and the Depositor at the
time of the Successor Property Trustee's acceptance of its appointment as
Property Trustee that:

          (a)  the Property Trustee is a banking corporation with trust powers,
     duly organized, validly existing and in good standing under the laws of its
     state of organization, with trust power and authority to execute and
     deliver, and to carry out and perform its obligations under the terms of,
     the Declaration;

          (b)  the execution, delivery and performance by the Property Trustee
     of the Declaration has been duly authorized by all necessary corporate
     action on the part of the Property Trustee.  The Declaration has been duly
     executed and delivered by the Property Trustee, and it constitutes a legal,
     valid and binding obligation of the Property Trustee, enforceable against
     it in accordance with its terms, subject to applicable bankruptcy,
     reorganization, moratorium, insolvency, and other similar laws affecting
     creditors' rights generally and to generally principles of equity and the
     discretion of the court (regardless of whether the enforcement of such
     remedies is considered in a proceeding in equity or at law);


                                      -45-
<PAGE>

          (c)  the execution, delivery and performance of the Declaration by the
     Property Trustee does not conflict with or constitute a breach of the
     Articles of Organization or By-laws of the Property Trustee; and

          (d)  no consent, approval or authorization of, or registration with or
     notice to, any State or Federal banking authority is required for the
     execution, delivery or performance by the Property Trustee, of the
     Declaration.

     Section 11.02.  Representations and Warranties of Delaware Trustee.

     The Trustee that acts as initial Delaware Trustee represents and warrants
to the Trust and to the Sponsor at the date of this Declaration, and each
Successor Delaware Trustee represents and warrants to the Trust and the Sponsor
at the time of the Successor Delaware Trustee's acceptance of its appointment as
Delaware Trustee that:

          (a)  The Delaware Trustee is a Delaware banking corporation with trust
     powers, duly organized, validly existing and in good standing under the
     laws of the State of Delaware, with trust power and authority to execute
     and deliver, and to carry out and perform its obligations under the terms
     of, the Declaration;

          (b)  The Delaware Trustee has been authorized to perform its
     obligations under the Certificate of Trust and the Declaration.  The
     Declaration under Delaware law constitutes a legal, valid and binding
     obligation of the Delaware Trustee, enforceable against it in accordance
     with its terms, subject to applicable bankruptcy, reorganization,
     moratorium, insolvency, and other similar laws affecting creditors' rights
     generally and to general principles of equity and the discretion of the
     court (regardless of whether the enforcement of such remedies is considered
     in a proceeding in equity or at law);

          (c)  No consent, approval or authorization of, or registration with or
     notice to, any State or Federal banking authority is required for the
     execution, delivery or performance by the Delaware Trustee, of the
     Declaration; and

          (d)  The Delaware Trustee is a natural person who is a resident of the
     State of Delaware or, if not a natural person, an entity which has its
     principal place of business in the State of Delaware.


                                      -46-
<PAGE>

EFFECTIVE AS BETWEEN THE TRUST AND SUCH SECURITYHOLDER AND SUCH OTHERS.

                              PUBLIC SERVICE COMPANY OF
                              COLORADO, as Depositor

                              By:  /s/ Brian P. Jackson
                                 ----------------------------------------
                                   Name:     Brian P. Jackson
                                   Title:    Senior Vice President
                                             and Chief Financial Officer

                              THE BANK OF NEW YORK
                              Property Trustee

                              By:  /s/ Walter N. Gitlin
                                 ----------------------------------------
                                   Name:
                                   Title:

                              THE BANK OF NEW YORK (DELAWARE)
                              as Delaware Trustee

                              By:  /s/ Mary Jane Morrissey
                                 ----------------------------------------
                                   Name:  Mary Jane Morrissey
                                   Title:    Authorized Signatory

                              NANCY E. FELKER,
                              as Administrative Trustee

                                   /s/ Nancy E. Felker
                                 ----------------------------------------


                                      -47-
<PAGE>

                                                                      EXHIBIT A

                              CERTIFICATE OF TRUST
                                       OF
                              PSCO CAPITAL TRUST I

          THIS CERTIFICATE OF TRUST of PSCO Capital Trust I (the "Trust"), dated
as of February 27, 1998, is being duly executed and filed by the undersigned, as
trustees, to form a business trust under the Delaware Business Trust Act (12
Del. C. Section 3801, et seq.).

          (i)   Name.  The name of the business trust being formed hereby is
PSCO Capital Trust I.

          (ii)  Delaware Trustee.  The name and business address of the trustee
of the Trust in the State of Delaware are :

          The Bank of New York (Delaware)
          White Clay Center, Route 273
          Newark, DE 19711

          (iii) Counterparts. This Certificate of Trust may be executed in one
or more counterparts, all of which together shall constitute one and the same
instrument.

          (iv)  Effective Date.  This Certificate of Trust shall be effective as
of its filing.

          IN WITNESS WHEREOF, the undersigned, being the trustees of the Trust,
have executed this Certificate of Trust as of the date first above written.

                         The Bank of New York, as Trustee


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

                         The Bank of New York, Delaware, as Trustee

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


                         ---------------------------------------
                         Nancy Felker, as Trustee


                                       A-1
<PAGE>

                                                                       EXHIBIT B

           THIS CERTIFICATE IS NOT TRANSFERABLE EXCEPT AS PROVIDED IN
               SECTION 5.10 OF THE DECLARATION REFERRED TO HEREIN

                               Certificate Number

                                       C-1

                          Number of Common Securities
                                    240,000
                    Certificate Evidencing Common Securities
                                       of
                              PSCO Capital Trust I

                             7.60% Common Securities
                  (liquidation amount $25 per Common Security)

     PSCO Capital Trust I, a statutory business trust created under the laws of
the State of Delaware (the "Trust"), hereby certifies that Public Service
Company of Colorado (the "Holder") is the registered owner of Two Hundred Forty
Thousand (240,000) common securities of the Trust representing undivided
beneficial interests in the assets of the Trust and designated as the 7.60%
Common Securities (liquidation amount $25 per Common Security) (the "Common
Securities").  In accordance with Section 5.10 of the Declaration (as defined
below) the Common Securities are transferable upon the books and records of the
Trust only to the Holder or any Affiliate of the Holder, subject to the
procedures and conditions set forth in Section 5.10 of the Declaration.  The
designations, rights, privileges, restrictions, preferences and other terms and
provisions of the Common Securities are set forth in, and this certificate and
the Common Securities represented hereby are issued and shall in all respects be
subject to the terms and provisions of, the Amended and Restated Declaration of
the Trust dated as of May 11, 1998 as the same may be amended from time to time
(the "Declaration").  The Trust will furnish a copy of the Declaration to the
Holder without charge upon written request to the Trust at its principal place
of business or registered office.

     Upon receipt of this certificate, the Holder is bound by the Declaration
and is entitled to the benefits thereunder.

     IN WITNESS WHEREOF, the Administrative Trustee of the Trust has executed
this certificate this 11th day of May, 1998.

                              PSCO CAPITAL TRUST I

                         By:
                              -------------------------------------------------
                              Name:  Nancy E. Felker, as Administrative Trustee


                                       B-1
<PAGE>

                                                                       EXHIBIT C
                               Certificate Number

                                       P-1


                                                  Number of Preferred Securities
                                                            CUSIP NO.  69360R208

                  Certificate Evidencing Preferred Securities
                                       of
                              PSCO Capital Trust I

                   7.60% Trust Originated Preferred Securities
                (liquidation amount $25 per Preferred Security)
                   (aggregate liquidation amount $194,000,000)

     PSCO Capital Trust I, a statutory business trust created under the laws of
the State of Delaware (the "Trust"), hereby certifies that Cede & Co. (the
"Holder") is the registered owner of Seven Million, Seven Hundred Sixty Thousand
(7,760,000) preferred securities of the Trust representing an undivided
beneficial interest in the assets of the Trust and designated the PSCO Capital
Trust I 7.60% Trust Originated Preferred Securities (liquidation amount $25 per
Preferred Security)(the "Preferred Securities").  The Preferred Securities are
transferable on the books and records of the Trust, in person or by a duly
authorized attorney, upon surrender of this certificate duly endorsed and in
proper form for transfer as provided in Section 5.04 of the Declaration (as
defined below).  The designations, rights, privileges, restrictions, preferences
and other terms and provisions of the Preferred Securities are set forth in, and
this certificate and the Preferred Securities represented hereby are issued and
shall in all respects be subject to the terms and provisions of, the Amended and
Restated Declaration of the Trust dated as of May 11, 1998 as the same may be
amended from time to time (the "Declaration").  The Holder is entitled to the
benefits of the Preferred Securities Guarantee Agreement entered into by Public
Service Company of Colorado, a Colorado corporation, and The Bank of New York as
guarantee trustee, dated as of May 11, 1998 (the "Preferred Securities
Guarantee") to the extent provided therein, together with the obligations of
Public Service Company of Colorado under the Declaration, its Deferrable
Interest Subordinated Debentures, Series A and the Indenture related to such
Deferrable Interest Subordinated Debentures.  The Trust will furnish a copy of
the aforementioned agreements and instruments to the Holder without charge upon
written request to the Trust at its principal place of business or registered
office.

     Upon receipt of this certificate, the Holder is bound by the Declaration
and is entitled to the benefits thereunder.


                                       C-1
<PAGE>

     IN WITNESS WHEREOF, the Administrative Trustee of the Trust has executed
this certificate this 11th day of May, 1998.

                         PSCO CAPITAL TRUST I


                         By:
                            -------------------------------------------------
                            Name:  Nancy E. Felker, as Administrative Trustee
Countersigned:

THE BANK OF NEW YORK, as Securities Registrar


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

     [To be included on face of Book-Entry Preferred Securities Certificate]

     THIS PREFERRED SECURITY IS A BOOK-ENTRY PREFERRED SECURITIES CERTIFICATE
WITHIN THE MEANING OF THE DECLARATION PREVIOUSLY REFERRED TO AND IS REGISTERED
IN THE NAME OF THE DEPOSITORY TRUST COMPANY (THE "DEPOSITORY") OR A NOMINEE OF
THE DEPOSITORY.  THIS PREFERRED SECURITY IS EXCHANGEABLE FOR PREFERRED
SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS
NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE DECLARATION AND NO
TRANSFER OF THIS PREFERRED SECURITY (OTHER THAN A TRANSFER OF THIS PREFERRED
SECURITY AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY OR BY A
NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE
DEPOSITORY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

     UNLESS THIS PREFERRED SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION, (55 WATER STREET, NEW
YORK) TO PSCO CAPITAL TRUST I OR ITS AGENT FOR REGISTRATION OF TRANSFER,
EXCHANGE OR PAYMENT, AND ANY PREFERRED SECURITY ISSUED IS REGISTERED IN THE NAME
OF CEDE & CO.  OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO.  OR
TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY A PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE
& CO., HAS AN INTEREST HEREIN.


                                       C-2
<PAGE>

                          [FORM OF REVERSE OF SECURITY]


     Distributions payable on each Preferred Security will be fixed at a rate
per annum of 7.60% (the "Coupon Rate") of the stated liquidation amount of $25
per Preferred Security, such rate being the rate of interest payable on the
Debentures to be held by the Property Trustee.  Distributions in arrears for
more than one quarter will bear interest thereon compounded quarterly at the
Coupon Rate (to the extent permitted by applicable law).  The term
"Distributions" as used herein includes such cash distributions and any such
interest payable unless otherwise stated.  A Distribution is payable only to the
extent that payments are made in respect of the Debentures held by the Property
Trustee and to the extent the Property Trustee has funds available therefor.
The amount of Distributions payable for any period will be computed for any full
quarterly Distribution period on the basis of a 360-day year of twelve 30-day
months, and for any period shorter than a full quarterly Distribution period for
which Distributions are computed, Distributions will be computed on the basis of
the actual number of days elapsed per 90-day quarter.

     Except as otherwise described below, Distributions on the Preferred
Securities will be cumulative, will accrue from the date of original issuance
and will be payable quarterly in arrears, on March 31, June 30, September 30 and
December 31 of each year, commencing on June 30, 1998, which payment dates shall
correspond to the interest payment dates on the Debentures.  The Issuer of the
Debentures has the right under the Indenture to defer payments of interest by
extending the interest payment period from time to time on the Debentures for a
period not exceeding 20 consecutive quarters or the final maturity date of the
Debentures (each an "Extension Period") and, as a consequence of such deferral,
Distributions will also be deferred.  Despite such deferral, quarterly
Distributions will continue to accrue with interest thereon (to the extent
permitted by applicable law) at the Coupon Rate compounded quarterly during any
such Extension Period.  Prior to the termination of any such Extension Period,
the issuer of the Debentures may further extend such Extension Period; PROVIDED
THAT such Extension Period together with all such previous and further
extensions thereof may not exceed 20 consecutive quarters or the final maturity
date of the Debentures.  Payments of accrued Distributions will be payable to
Holders as they appear on the books and records of the Trust on the first record
date after the end of the Extension Period.  Upon the termination of any
Extension Period and the payment of all amounts then due, the issuer of the
Debentures may commence a new Extension Period, subject to the above
requirements.

     The Preferred Securities shall be redeemable as provided in the
Declaration.


                                       C-3
<PAGE>

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


                                   ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Preferred
Security Certificate to:


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

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

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


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

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

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

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


and irrevocably appoints


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

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

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

agent to transfer this Preferred Security Certificate on the books of the Trust.
The agent may substitute another to act for him or her.

Date:
       --------------------------

Signature:
            ---------------------
(Sign exactly as your name appears on the other side of this Preferred Security
Certificate)

Signature Guaranty:
                    -----------------------

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements of the [Registrar], which requirements include membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature guarantee program" as may be determined by the [Registrar] in
addition to, or in substitution for, STAMP, all in accordance with the
Securities Exchange Act of 1934, as amended.


                                       C-4

<PAGE>


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


                       PUBLIC SERVICE COMPANY OF COLORADO,

                                                       AS ISSUER

                                       TO


                              THE BANK OF NEW YORK,

                                                       AS TRUSTEE



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


                                    INDENTURE


                          SUBORDINATED DEBT SECURITIES


                             DATED AS OF MAY 1, 1998


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


- --------------------------------------------------------------------------------
<PAGE>

                       PUBLIC SERVICE COMPANY OF COLORADO

           Reconciliation and tie between Trust Indenture Act of 1939
                     and Indenture, dated as of May 1, 1998

<TABLE>
<CAPTION>

Trust Indenture                                                Indenture Section
  Act Section
<S>                                                            <C>
Section 310(a)(1). . . . . . . . . . . . . . . . . . . . . .   609
           (a)(2). . . . . . . . . . . . . . . . . . . . . .   609
           (a)(3). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (a)(4). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (a)(5). . . . . . . . . . . . . . . . . . . . . .   609
           (b) . . . . . . . . . . . . . . . . . . . . . . .   608, 610
Section 311(a) . . . . . . . . . . . . . . . . . . . . . . .   613
           (b) . . . . . . . . . . . . . . . . . . . . . . .   613
Section 312(a) . . . . . . . . . . . . . . . . . . . . . . .   701, 702(a)
           (b) . . . . . . . . . . . . . . . . . . . . . . .   702(b)
           (c) . . . . . . . . . . . . . . . . . . . . . . .   702(c)
Section 313(a) . . . . . . . . . . . . . . . . . . . . . . .   703(a)
           (b) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (c) . . . . . . . . . . . . . . . . . . . . . . .   703(a)
           (d) . . . . . . . . . . . . . . . . . . . . . . .   703(b)
Section 314(a) . . . . . . . . . . . . . . . . . . . . . . .   704
           (b) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (c)(1). . . . . . . . . . . . . . . . . . . . . .   102
           (c)(2). . . . . . . . . . . . . . . . . . . . . .   102
           (c)(3). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (d) . . . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (e) . . . . . . . . . . . . . . . . . . . . . . .   102
Section 315(a) . . . . . . . . . . . . . . . . . . . . . . .   601(a)
           (b) . . . . . . . . . . . . . . . . . . . . . . .   602
           (c) . . . . . . . . . . . . . . . . . . . . . . .   601(b)
           (d) . . . . . . . . . . . . . . . . . . . . . . .   601(c)
           (d)(1). . . . . . . . . . . . . . . . . . . . . .   601(a), 601(c)
           (d)(2). . . . . . . . . . . . . . . . . . . . . .   601(c)
           (d)(3). . . . . . . . . . . . . . . . . . . . . .   601(c)
           (e) . . . . . . . . . . . . . . . . . . . . . . .   514
Section 316(a)(last sentence)  . . . . . . . . . . . . . . .   101
           (a)(1)(A) . . . . . . . . . . . . . . . . . . . .   512
           (a)(1)(B) . . . . . . . . . . . . . . . . . . . .   502, 513
           (a)(2). . . . . . . . . . . . . . . . . . . . . .   Not Applicable
           (b) . . . . . . . . . . . . . . . . . . . . . . .   508
Section 317(a)(1). . . . . . . . . . . . . . . . . . . . . .   503
           (a)(2). . . . . . . . . . . . . . . . . . . . . .   504
           (b) . . . . . . . . . . . . . . . . . . . . . . .   1008
Section 318(a) . . . . . . . . . . . . . . . . . . . . . . .   107
</TABLE>
- ---------------

NOTE:  This reconciliation and tie shall not, for any purpose, be deemed to be a
part of this Indenture.
<PAGE>

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            Page
<S>                                                                         <C>
RECITALS OF THE COMPANY. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

                                   ARTICLE ONE

                        Definitions and other Provisions
                             of General Application

SECTION 101.  Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
     ACT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     AFFILIATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     AUTHENTICATING AGENT. . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     BANKRUPTCY LAW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     BOARD OF DIRECTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     BOARD RESOLUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     BUSINESS DAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     CAPITAL LEASE OBLIGATIONS . . . . . . . . . . . . . . . . . . . . . . . . 3
     COMMISSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     COMPANY REQUEST or COMPANY ORDER. . . . . . . . . . . . . . . . . . . . . 3
     CORPORATE TRUST OFFICE. . . . . . . . . . . . . . . . . . . . . . . . . . 3
     COVENANT DEFEASANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     CUSTODIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     DEFAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     DEFAULTED INTEREST. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     DEFEASANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     DEPOSITORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     DOLLARS and $ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     EVENT OF DEFAULT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     EXCHANGE ACT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     GAAP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     GLOBAL SECURITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     HOLDER or SECURITYHOLDER. . . . . . . . . . . . . . . . . . . . . . . . . 4
     INDENTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     INTEREST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     INTEREST PAYMENT DATE . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     MATURITY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     OFFICER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     OFFICER'S CERTIFICATE . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     OPINION OF COUNSEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     ORIGINAL ISSUE DISCOUNT SECURITY. . . . . . . . . . . . . . . . . . . . . 5
     OUTSTANDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     PAYING AGENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PERIODIC OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PERSON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PLACE OF PAYMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PREDECESSOR SECURITY. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PREFERRED SECURITIES. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     PSCo TRUST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     REDEMPTION DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     REDEMPTION PRICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7


                                       -i-
<PAGE>

                                                                            Page
                                                                            ----

     REGISTERED SECURITY . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     REGULAR RECORD DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     RESPONSIBLE OFFICER . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     SECURITIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     SECURITY REGISTER and SECURITY REGISTRAR. . . . . . . . . . . . . . . . . 7
     SENIOR INDEBTEDNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     SPECIAL RECORD DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     STATED MATURITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     TRANCHE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     TRUST INDENTURE ACT . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     TRUST SECURITIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     TRUSTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     U.S. GOVERNMENT OBLIGATIONS . . . . . . . . . . . . . . . . . . . . . . . 8
     VICE PRESIDENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SECTION 102.   Compliance Certificates and Opinions. . . . . . . . . . . . . . 9
SECTION 103.   Form of Documents Delivered to Trustee. . . . . . . . . . . . .10
SECTION 104.   Acts of Holders . . . . . . . . . . . . . . . . . . . . . . . .10
SECTION 105.   Notices, Etc., to Trustee and Company . . . . . . . . . . . . .12
SECTION 106.   Notice to Holders; Waiver . . . . . . . . . . . . . . . . . . . .
SECTION 107.   Conflict with Trust Indenture Act . . . . . . . . . . . . . . .13
SECTION 108.   Effect of Headings and Table of Contents. . . . . . . . . . . .13
SECTION 109.   Successors and Assigns. . . . . . . . . . . . . . . . . . . . .13
SECTION 110.   Separability Clause . . . . . . . . . . . . . . . . . . . . . .13
SECTION 111.   Benefits of Indenture . . . . . . . . . . . . . . . . . . . . .13
SECTION 112.   Governing Law . . . . . . . . . . . . . . . . . . . . . . . . .14
SECTION 113.   Legal Holidays. . . . . . . . . . . . . . . . . . . . . . . . .14
SECTION 114.   No Recourse Against Others. . . . . . . . . . . . . . . . . . .14

                                   ARTICLE TWO

                                 Security Forms

SECTION 201.   Forms Generally . . . . . . . . . . . . . . . . . . . . . . . .14
SECTION 202.   Form of Trustee's Certificate of Authentication . . . . . . . .15

                                  ARTICLE THREE

                                 The Securities

SECTION 301.   Amount Unlimited; Issuable in Series. . . . . . . . . . . . . .15
SECTION 302.   Denominations . . . . . . . . . . . . . . . . . . . . . . . . .18
SECTION 303.   Execution, Authentication, Delivery and Dating. . . . . . . . .18
SECTION 304.   Temporary Securities. . . . . . . . . . . . . . . . . . . . . .22
SECTION 305.   Registration, Registration of Transfer and Exchange . . . . . .23
SECTION 306.   Mutilated, Destroyed, Lost and Stolen Securities. . . . . . . .25
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


                                      -ii-
<PAGE>

                                                                            Page
                                                                            ----

                                  ARTICLE FOUR

                           Satisfaction and Discharge

SECTION 401.   Satisfaction and Discharge of Indenture . . . . . . . . . . . .28
SECTION 402.   Application of Trust Money. . . . . . . . . . . . . . . . . . .30

                                  ARTICLE FIVE

                                    Remedies

SECTION 501.   Events of Default . . . . . . . . . . . . . . . . . . . . . . .30
SECTION 502.   Acceleration of Maturity; Rescission and Annulment. . . . . . .32
SECTION 503.   Collection of Indebtedness and Suits for Enforcement
                by Trustee . . . . . . . . . . . . . . . . . . . . . . . . . .33
SECTION 504.   Trustee May File Proofs of Claim. . . . . . . . . . . . . . . .34
SECTION 505.   Trustee May Enforce Claims Without Possession of Securities . .34
SECTION 506.   Application of Money Collected. . . . . . . . . . . . . . . . .35
SECTION 507.   Limitation on Suits . . . . . . . . . . . . . . . . . . . . . .35
SECTION 508.   Unconditional Right of Holders to Receive Principal,
                Premium and Interest . . . . . . . . . . . . . . . . . . . . .36
SECTION 509.   Restoration of Rights and Remedies. . . . . . . . . . . . . . .36
SECTION 510.   Rights and Remedies Cumulative. . . . . . . . . . . . . . . . .37
SECTION 511.   Delay or Omission Not Waiver. . . . . . . . . . . . . . . . . .37
SECTION 512.   Control by Holders. . . . . . . . . . . . . . . . . . . . . . .37
SECTION 513.   Waiver of Past Defaults . . . . . . . . . . . . . . . . . . . .37
SECTION 514.   Undertaking for Costs . . . . . . . . . . . . . . . . . . . . .38

                                   ARTICLE SIX

                                   The Trustee

SECTION 601.   Certain Duties and Responsibilities of the Trustee. . . . . . .38
SECTION 602.   Notice of Defaults. . . . . . . . . . . . . . . . . . . . . . .39
SECTION 603.   Certain Rights of Trustee . . . . . . . . . . . . . . . . . . .39
SECTION 604.   Not Responsible for Recitals or Issuance of Securities. . . . .41
SECTION 605.   May Hold Securities . . . . . . . . . . . . . . . . . . . . . .41
SECTION 606.   Money Held in Trust . . . . . . . . . . . . . . . . . . . . . .41
SECTION 607.   Compensation and Reimbursement. . . . . . . . . . . . . . . . .41
SECTION 608.   Disqualification; Conflicting Interests . . . . . . . . . . . .42
SECTION 609.   Corporate Trustee Required; Eligibility . . . . . . . . . . . .42
SECTION 610.   Resignation and Removal; Appointment of Successor . . . . . . .42
SECTION 611.   Acceptance of Appointment by Successor. . . . . . . . . . . . .44
SECTION 612.   Merger, Conversion, Consolidation or Succession to Business . .45
SECTION 613.   Preferential Collection of Claims Against Company . . . . . . .46
SECTION 614.   Appointment of Authenticating Agent . . . . . . . . . . . . . .46


                                      -iii-
<PAGE>

                                                                            Page
                                                                            ----

                                  ARTICLE SEVEN

                Holders' Lists and Reports by Trustee and Company

SECTION 701.   Company to Furnish Trustee Names and Addresses of Holders . . .48
SECTION 702.   Preservation of Information; Communications to Holders. . . . .49
SECTION 703.   Reports by Trustee. . . . . . . . . . . . . . . . . . . . . . .50
SECTION 704.   Reports by Company. . . . . . . . . . . . . . . . . . . . . . .50

                                  ARTICLE EIGHT

                 Consolidation, Merger, Lease, Sale or Transfer

SECTION 801.   When Company May Merge, Etc.. . . . . . . . . . . . . . . . . .51
SECTION 802.   Opinion of Counsel. . . . . . . . . . . . . . . . . . . . . . .52
SECTION 803.   Successor Corporation Substituted . . . . . . . . . . . . . . .52

                                  ARTICLE NINE

                             Supplemental Indentures

SECTION 901.   Supplemental Indentures Without Consent of Holders. . . . . . .53
SECTION 902.   Supplemental Indentures with Consent of Holders . . . . . . . .55
SECTION 903.   Execution of Supplemental Indentures. . . . . . . . . . . . . .56
SECTION 904.   Effect of Supplemental Indentures . . . . . . . . . . . . . . .57
SECTION 905.   Conformity with Trust Indenture Act . . . . . . . . . . . . . .57
SECTION 906.   Reference in Securities to Supplemental Indentures. . . . . . .57

                                   ARTICLE TEN

                                    Covenants

SECTION 1001.  Payments of Securities. . . . . . . . . . . . . . . . . . . . .57
SECTION 1002.  Maintenance of Office or Agency . . . . . . . . . . . . . . . .57
SECTION 1003.  Corporate Existence . . . . . . . . . . . . . . . . . . . . . .58
SECTION 1004.  Payment of Taxes and Other Claims . . . . . . . . . . . . . . .58
SECTION 1005.  Compliance Certificates . . . . . . . . . . . . . . . . . . . .58
SECTION 1006.  Commission Reports. . . . . . . . . . . . . . . . . . . . . . .59
SECTION 1007.  Waiver of Stay, Extension or Usury Laws . . . . . . . . . . . .60
SECTION 1008.  Money for Securities Payments to Be Held in Trust . . . . . . .60

                                 ARTICLE ELEVEN

                            Redemption of Securities

SECTION 1101.  Applicability of Article. . . . . . . . . . . . . . . . . . . .62
SECTION 1102.  Election to Redeem; Notice to Trustee . . . . . . . . . . . . .62


                                      -iv-
<PAGE>

                                                                            Page
                                                                            ----

SECTION 1103.  Selection by Trustee of Securities to Be Redeemed . . . . . . .62
SECTION 1104.  Notice of Redemption. . . . . . . . . . . . . . . . . . . . . .63
SECTION 1105.  Deposit of Redemption Price . . . . . . . . . . . . . . . . . .64
SECTION 1106.  Securities Payable on Redemption Date . . . . . . . . . . . . .65
SECTION 1107.  Securities Redeemed in Part . . . . . . . . . . . . . . . . . .65

                                 ARTICLE TWELVE

                                  Sinking Funds

SECTION 1201.  Applicability of Article. . . . . . . . . . . . . . . . . . . .65
SECTION 1202.  Satisfaction of Sinking Fund Payments with Securities . . . . .66
SECTION 1203.  Redemption of Securities for Sinking Fund . . . . . . . . . . .66

                                ARTICLE THIRTEEN

                       Defeasance and Covenant Defeasance

SECTION 1301.  Applicability of Article; Company's Option to Effect
               Defeasance or Covenant Defeasance . . . . . . . . . . . . . . .67
SECTION 1302.  Defeasance and Discharge. . . . . . . . . . . . . . . . . . . .67
SECTION 1303.  Covenant Defeasance.. . . . . . . . . . . . . . . . . . . . . .68
SECTION 1304.  Conditions to Defeasance or Covenant Defeasance . . . . . . . .68
SECTION 1305.  Deposited Money and Government Obligations To Be Held In Trust.70

                                ARTICLE FOURTEEN

                                  Subordination

SECTION 1401.  Agreement of Securityholders that Securities Subordinated to
               Extent Provided . . . . . . . . . . . . . . . . . . . . . . . .71
SECTION 1402.  Company not to Make Payments with Respect to Securities in
               Certain Circumstances . . . . . . . . . . . . . . . . . . . . .71
SECTION 1403.  Securities Subordinated to Prior Payment of all Senior
               Indebtedness on Dissolution, Liquidation or Reorganization of
               Company . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
SECTION 1404.  Securityholders to be Subrogated to Right of Holders of Senior
               Indebtedness. . . . . . . . . . . . . . . . . . . . . . . . . .73
SECTION 1405.  Obligation of the Company Unconditional . . . . . . . . . . . .74
SECTION 1406.  Trustee Entitled to Assume Payments Not Prohibited in
               Absence of Notice . . . . . . . . . . . . . . . . . . . . . . .74
SECTION 1407.  Application by Trustee of Monies Deposited With It. . . . . . .75
SECTION 1408.  Subordination Rights not Impaired by Acts or Omissions of
               Company or Holders of Senior Indebtedness . . . . . . . . . . .75
SECTION 1409.  Securityholders Authorize Trustee to Effectuate Subordination
               of Securities . . . . . . . . . . . . . . . . . . . . . . . . .75
SECTION 1410.  Right of Trustee to Hold Senior Indebtedness. . . . . . . . . .76


                                       -v-
<PAGE>

                                                                            Page
                                                                            ----
SECTION 1411.  Article Fourteen Not to Prevent Events of Default . . . . . . .76

                                 ARTICLE FIFTEEN

                                  Miscellaneous

SECTION 1501.  Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . .76
</TABLE>

                                      -vi-
<PAGE>

          INDENTURE, dated as of May 1, 1998, between PUBLIC SERVICE COMPANY OF
COLORADO, a corporation duly organized and existing under the laws of the State
of Colorado (herein called the "COMPANY"), having its principal office at 1225
17th Street, Denver, Colorado  80202, and The Bank of New York, a New York
banking corporation, as Trustee (herein called the "TRUSTEE"), having its
corporate trust office at 101 Barclay Street, Floor 21 West, New York, New York
10286.

                             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 unsecured
subordinated debentures, notes or other evidences of indebtedness (herein called
the "SECURITIES"), to be issued in one or more series, authenticated and
delivered, as in this Indenture provided.

          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
Securities by the Holders thereof, it is mutually covenanted and agreed, for the
equal and proportionate benefit of all Holders of the Securities or of the
Securities of any series, without giving priority of any one Security or series
over any other, except as otherwise expressly provided herein, 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 GAAP;
<PAGE>

          (4)  the word "INCLUDING" (and with correlative meaning "INCLUDE")
     means including, without limiting the generality of, any description
     preceding such term; 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.

     Certain terms, used principally in Article Six, are defined in that
     Article.

          "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 with respect to any Security, any Person
authorized by the Trustee pursuant to Section 614 to act on behalf of the
Trustee to authenticate such Securities.

          "BANKRUPTCY LAW" means Title 11, U.S. Code, as in effect from time to
time, or any similar federal or state law for the relief of debtors.

          "BOARD OF DIRECTORS" means the board of directors of the Company;
provided, however, that when the context refers to actions or resolutions of the
Board of Directors, then the term "Board of Directors" shall also mean any duly
authorized committee of the Board of Directors of the Company or Officer
authorized to act with respect to any particular matter to exercise the power of
the Board of Directors of the Company.

          "BOARD RESOLUTION" means a copy of a resolution certified by the
Secretary or an Assistant 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, regulation or executive order to close.


                                       -2-
<PAGE>

          "CAPITAL LEASE OBLIGATIONS" of a person means any obligation that is
required to be classified and accounted for as a capital lease on the face of a
balance sheet of such Person prepared in accordance with GAAP.

          "COMMISSION" means the Securities and Exchange Commission, as 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 Indenture until a successor corporation shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor corporation.

          "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 President or
a Vice President, and by its Treasurer, an Assistant Treasurer, its Controller,
an Assistant Controller, its Secretary or an Assistant Secretary, and delivered
to the Trustee.

          "CORPORATE TRUST OFFICE" means the principal office of the Trustee at
which at any particular time its corporate trust business shall be administered,
which office at the date hereof is located at 101 Barclay Street, Floor 21 West,
New York, New York  10286.

          "COVENANT DEFEASANCE" has the meaning specified in Section 1303.

          "CUSTODIAN" means any receiver, trustee, assignee, liquidator,
sequestrator or similar official under any Bankruptcy Law.

          "DEFAULT" means any event which is, or after notice or passage of time
or both would be, an Event of Default.

          "DEFAULTED INTEREST" has the meaning specified in Section 307.

          "DEFEASANCE" has the meaning specified in Section 1302.

          "DEPOSITORY" means, with respect to the Securities of any series, or
any Tranche thereof, issuable or issued in whole or in part in the form of one
or more Global Securities, the Person designated as Depository by the Company
pursuant to Section 301, which must be a clearing agency registered under the
Exchange Act until a successor Depository shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Depository" shall mean
or include each Person who is


                                       -3-
<PAGE>

then a Depository hereunder, and if at any time there is more than one such
Person, "Depository" shall mean the Depository with respect to the Securities of
that series or Tranche.

          "DOLLARS" and "$" means the coin or currency of the United States of
America as at the time of payment is legal tender for the payment of public and
private debt.

          "EVENT OF DEFAULT" has the meaning specified in Section 501.

          "EXCHANGE ACT" means the Securities and Exchange Act of 1934 and the
rules and regulations promulgated thereunder, in each case as amended from time
to time.

          "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Standards Accounting Board, and as are applicable to the financial
statements of the Company, in each case as of the date of any computation
required hereunder.

          "GLOBAL SECURITY" means a Security that evidences all or part of the
Securities of any series, or any Tranche thereof.

          "HOLDER" or "SECURITYHOLDER" means, with respect to a Security, the
Person in whose name such Security is registered in the Security Register (which
terms, in the case of a Global Security, mean the Depository with respect to
such Security).

          "INDENTURE" means this instrument as originally executed or 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
and shall include the terms of particular series of Securities, and any Tranche
thereof, established as contemplated by Section 301.

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

          "INTEREST PAYMENT DATE", when used with respect to any Security, means
the Stated Maturity of an installment of interest on such Security.

          "MATURITY", when used with respect to any Security, means the date on
which the principal of such Security or an installment 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.

          "OFFICER" means the Chairman of the Board, the Vice Chairman of the
Board, the President, any Vice President, the


                                       -4-
<PAGE>

Treasurer, any Assistant Treasurer, the Controller, the Secretary or any
Assistant Secretary of the Company.

          "OFFICER'S CERTIFICATE" means a certificate signed by an Officer and
delivered to the Trustee.

          "OPINION OF COUNSEL" means a written opinion of counsel, who may be an
employee of or counsel for the Company, and who shall be reasonably acceptable
to the Trustee.

          "ORIGINAL ISSUE DISCOUNT SECURITY" means any Security 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 502.

          "OUTSTANDING", when used with respect to any Securities, means, as of
the date of determination, all such Securities theretofore authenticated and
delivered under this Indenture, except:

            (i)     Securities theretofore cancelled by the Trustee or delivered
     to the Trustee for cancellation;

           (ii)     Securities, or portions thereof, 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 Securities; provided that,
     if such Securities are to be redeemed prior to the Stated Maturity thereof,
     notice of such redemption has been duly given pursuant to this Indenture or
     provision therefor satisfactory to the Trustee has been made;

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

           (iv)     Securities which have been defeased pursuant to
     Section 1302;

PROVIDED, HOWEVER, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder (a) the principal
amount of an Original Issue Discount Security that shall be deemed to be
Outstanding for such purposes shall be that portion of the principal amount
thereof that could be declared to be due and payable upon the occurrence of an
Event of Default and the


                                       -5-
<PAGE>

continuation thereof pursuant to the terms of such Original Issue Discount
Security as of the date of such determination and (b) Securities owned by the
Company or any other obligor upon the Securities or any Affiliate of the Company
(other than a PSCo Trust) 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 or waiver, only Securities which the Trustee knows to
be so owned shall be so disregarded.  Securities 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 Securities and that the pledgee is not the Company or any other obligor
upon the Securities 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 (and premium, if any) or interest, if any, on any Securities on
behalf of the Company.  The Company may act as Paying Agent with respect to any
Securities issued hereunder.

          "PERIODIC OFFERING" means an offering of Securities of a series from
time to time any or all of the specific terms of which Securities, which may be
in one or more Tranches, including the rate or rates of interest, if any,
thereon, the Stated Maturity or Maturities thereof and the redemption
provisions, if any, with respect thereto, are to be determined by the Company or
its agents from time to time subsequent to the initial request for
authentication and delivery of such Securities by the Trustee, all as
contemplated in Section 301.

          "PERSON" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or any agency or political subdivision thereof.

          "PLACE OF PAYMENT", when used with respect to any Security, means the
place or places where the principal of (and premium, if any) and interest, if
any, on such Security or any Tranche thereof, are payable as specified as
contemplated by Section 301.

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

          "PREFERRED SECURITIES" means the preferred securities issued by a PSCo
Trust.


                                       -6-
<PAGE>

          "PSCO TRUST" means a statutory business trust created by the Company
for the purpose of issuing Trust Securities and to use the proceeds of the sale
thereof to purchase one or more series of Securities.

          "REDEMPTION DATE", when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

          "REDEMPTION PRICE", when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

          "REGISTERED SECURITY" means any Security issued hereunder and
registered in the Security Register.

          "REGULAR RECORD DATE" for the interest payable on any Interest Payment
Date on the Securities means the date specified for that purpose as contemplated
by Section 301.

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

          "SECURITY REGISTER" and "SECURITY REGISTRAR" have the respective
meanings specified in Section 305.

          "SENIOR INDEBTEDNESS" means the principal of and premium, if any, and
interest, if any, on the following, whether outstanding on the date of execution
of this Indenture or thereafter incurred or created:  (i) all obligations of the
Company for money borrowed by the Company (including Capital Lease Obligations
and purchase money obligations with an original maturity in excess of one year)
or evidenced by debentures (other than the Securities), bonds, notes, bankers'
acceptances or other corporate debt securities or similar instruments issued by
the Company; (ii) all obligations of the Company with respect to letters of
credit; (iii) all obligations of the Company constituting a guarantee or
assumption of indebtedness of others


                                       -7-
<PAGE>

of the type referred to in the preceding clauses (i) and (ii), including through
an agreement to purchase, contingent or otherwise; (iv) all dividends of others
for the payment of which the Company is responsible or liable as obligor,
guarantor or otherwise; (v) all obligations of the type referred to in clauses
(i) through (iv) of others secured by any property or asset of the Company
(whether or not such obligation is assumed by the Company), the amount of such
obligation being deemed to be the lesser of the value of such property or asset
or the amount of the obligation so secured or (vi) renewals, extensions or
refundings of any of the obligations referred to in the preceding clauses (i)
through (v); unless, in the case of any particular obligation, renewal,
extension or refunding, under the express provisions of the instrument creating
or evidencing the same, or pursuant to which the same is outstanding, such
obligation or such renewal, extension or refunding thereof is not superior in
right of payment to or is pari passu with the Securities.

          "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 Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such installment of principal or interest is due and payable.

          "TRANCHE" means a group of Securities which (a) are of the same series
and (b) are identical except as to principal amount and/or date of issuance.

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

          "TRUST SECURITIES" means the undivided beneficial interests in a PSCo
Trust.

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

          "U.S. GOVERNMENT OBLIGATIONS" means securities which are (i) direct
obligations of the United States of America for the payment of which its full
faith and credit is pledged or (ii)


                                       -8-
<PAGE>

obligations of a Person controlled or supervised by and acting as an agency or
instrumentality of the United States of America the timely payment of which is
unconditionally guaranteed by the full faith and credit of the United States of
America which, in either case, are not callable or redeemable at the option of
the issuer thereof or otherwise subject to prepayment, and shall also include a
depository receipt issued by a New York Clearing House bank or trust company as
custodian with respect to any such U.S. Government Obligation or a specific
payment or interest on or principal of any such U.S. Government Obligation held
by such custodian for the account of the holder of a depository receipt,
provided that (except as required by law) such custodian is not authorized to
make any deduction from the amount payable to the holder of such depository
receipt or from any amount held by the custodian in respect of the U.S.
Government Obligation or the specific payment of interest on or principal of the
U.S. Government Obligation evidenced by such depository receipt.

          "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, other than an action permitted
by Sections 614 and 704 hereof, the Company shall furnish to the Trustee an
Officer's Certificate stating that all conditions precedent, if any, provided
for in this Indenture relating to the proposed action have been complied with
and an Opinion of Counsel stating that in the opinion of such counsel all such
conditions precedent, if any, have been complied with, except that in the case
of any such application or request as to which the furnishing of such documents
is specifically required by any provision of this Indenture relating to such
particular application or request, no additional certificate or opinion need be
furnished.

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

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

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

          c.   a statement that, in the opinion of each such individual, he has
     made such examination or investigation as


                                       -9-
<PAGE>

     is necessary to enable him to express an informed opinion as to whether or
     not such covenant or condition has been complied with; and

          d.   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 may be based, insofar as it
relates to legal matters, upon a certificate or opinion of, or representations
by, counsel, unless such Officer has actual knowledge 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 has actual knowledge that the
certificate or opinion or representations with respect to such matters are
erroneous.

          The provisions above requiring that certain persons have actual
knowledge that certain matters or opinions are erroneous shall not be read to
impose any duty of examination or investigation upon such persons.

          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.

          (a)  Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given 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 agents 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


                                      -10-
<PAGE>

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 601)
conclusive in favor of the Trustee and the Company, if made in the manner
provided in this Section.

          (b)  The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit or written statement (which
need not be notarized) 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,
affidavit or written statement 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 and the Company deem sufficient.

          (c)  The ownership of Registered Securities shall be proved by the
Security Register.

          (d)  Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Security shall bind every future Holder
of the same Security and the Holder of every Security 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 Security.

          (e)  If the Company shall solicit from the Holders any request,
demand, authorization, direction, notice, consent, waiver or other Act, the
Company may, at its option, by Company Order, fix in advance a record date for
the determination of Holders entitled to give such request, demand,
authorization, direction, notice, consent, waiver or other Act, but the Company
shall have no obligation to do so.  If such a record date is fixed, such
request, demand, authorization, direction, notice, consent, waiver or other Act
may be given before or after such record date, but only the Holders of record at
the close of business on such record date shall be deemed to be Holders for the
purposes of determining (i) whether Holders of the requisite proportion of
Outstanding Securities have authorized or agreed or consented to such request,
demand, authorization, direction, notice, consent, waiver or other Act, and for
that purpose the Outstanding Securities shall be computed as of such record date
and/or (ii) which Holders may revoke any such Act (notwithstanding subsection
(f) of this Section).


                                      -11-
<PAGE>

          (f)  Until such time as written instruments shall have been delivered
to the Trustee with respect to the requisite percentage of principal amount of
Securities for the action contemplated by such instruments, any such instrument
executed and delivered by or on behalf of a Holder may be revoked with respect
to any or all of such Securities by written notice by such Holder or any
subsequent Holder, proven in the manner in which such instrument was proven.

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,

          (a)  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 and received by the Trustee at its Corporate Trust
     Office, Attention:  Corporate Trust Administrator, or

          (b)  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 Indenture, attention:  Secretary, or at any other
     address previously furnished in writing to the Trustee by the Company.

SECTION 106.   NOTICE TO HOLDERS; WAIVER.

          Where this Indenture or any Security provides for notice to Holders of
any event, such notice shall be deemed sufficiently given (unless otherwise
herein or in such Security 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 Security Register, not later than the latest date,
and not earlier than the earliest date, 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 or the validity of the proceedings to which such notice relates.
Where this Indenture or any Security 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.


                                      -12-
<PAGE>

          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.

          Any request, demand, authorization, direction, notice, consent or
waiver required or permitted under this Indenture shall be in the English
language, except that any published notice may be in an official language of the
country of publication.

SECTION 107.   CONFLICT WITH TRUST INDENTURE ACT.

          If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Indenture by any of
the provisions of the Trust Indenture Act, such required provision shall
control.  If any provision of this Indenture modifies or excludes any provision
of the Trust Indenture Act that may be so modified or excluded, the latter
provision shall be deemed to apply to this Indenture as so modified or shall be
excluded, as the case may be.

SECTION 108.   EFFECT OF HEADINGS AND TABLE OF CONTENTS.

          The headings of the Articles and Sections herein and the Table of
Contents are for convenience of reference only and shall not be taken to be any
part of or to control or affect the meaning, construction or effect of
provisions of this Indenture.

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.

          If any provision of this Indenture or of the Securities, or the
application of any such provision to any Person or circumstance, shall be held
to be invalid, illegal or unenforceable, the remainder of this Indenture or of
the Securities, or the application of such provision to Persons or circumstances
other than those as to whom or which it is invalid, illegal or unenforceable,
shall not in any way be affected or impaired thereby.

SECTION 111.   BENEFITS OF INDENTURE.

          Nothing in this Indenture or in the Securities, 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.


                                      -13-
<PAGE>

SECTION 112.   GOVERNING LAW.

          This Indenture and the Securities shall be governed by and construed
in accordance with the laws (other than the choice of law provisions) of the
State of New York except to the extent that the Trust Indenture Act shall be
applicable.

SECTION 113.   LEGAL HOLIDAYS.

          In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security shall not be a Business Day in any Place of Payment,
then (notwithstanding any other provision of this Indenture or of the
Securities, other than a provision in Securities of any series, or any Tranche
thereof, or in the indenture supplemental hereto, Board Resolution or Officer's
Certificate that establishes the terms of the Securities of such series or
Tranche, 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, and, if such payment is made or duly provided for on such Business
Day, no interest shall accrue on the amount so payable for the period from and
after such Interest Payment Date, Redemption Date or Stated Maturity, as the
case may be, to such Business Day.

SECTION 114.   NO RECOURSE AGAINST OTHERS.

          A director, officer, employee or stockholder, as such, of the Company
shall not have any liability for any obligations of the Company under the
Securities or this Indenture or for any claim based on, in respect of or by
reason of such obligations or their creation.  Each Securityholder, by accepting
a Security, waives and releases all such liability.  Such waivers and releases
are part of the consideration for the issuance of the Securities.


                                   ARTICLE TWO

                                 SECURITY FORMS

SECTION 201.   FORMS GENERALLY.

          The definitive Securities of each series shall be in substantially
such form or forms established as shall be established pursuant to Section 301,
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 the Company may deem appropriate and as are not contrary to the
provisions of this


                                      -14-
<PAGE>

Indenture, or as may be required to comply with the rules of any securities
exchange or of any automated quotation or book-entry system, or to conform to
usage, all as may be determined by the officers executing such Securities, as
evidenced by their execution of the Securities.

          The Securities of each series shall be issuable in registered form
without coupons.  The definitive Securities shall be produced in such manner as
shall be determined by the officers executing such Securities, as evidenced by
their execution thereof.

SECTION 202.   FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION.

          The Trustee's certificate of authentication shall be in substantially
the form set forth below:

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


                              -------------------------------
                                   as Trustee

Dated:                        By:
       -------------               ---------------------------
                                       Authorized Signatory


                                  ARTICLE THREE

                                 THE SECURITIES

SECTION 301.   AMOUNT UNLIMITED; ISSUABLE IN SERIES.

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

          The Securities may be issued from time to time in one or more series.
There shall be established in or pursuant to a Board Resolution, and set forth
in an Officer's Certificate, or established in one or more indentures
supplemental hereto, prior to the issuance of Securities of any series:

          (1)  the title of the Securities of the series (which shall
     distinguish the Securities of the series from all other Securities);

          (2)  any limit upon the aggregate principal amount of the Securities
     of the series which may be authenticated and delivered under this Indenture
     (except for Securities authenticated and delivered upon registration of
     transfer of, or in exchange for, or in lieu of, other Securities of the
     series pursuant to Sections 304, 305, 306, 906 or 1107);


                                      -15-
<PAGE>

          (3)  whether any Securities of the series, or any Tranche thereof, are
     to be issuable in global form with or without coupons and, if so, (i)
     whether beneficial owners of interests in any such Global Security may
     exchange such interests for Securities of such series and Tranche and of
     like tenor of any authorized form and denomination and the circumstances
     under which any such exchanges may occur, if other than in the manner
     provided in Section 305, and (ii) the name of the Depository with respect
     to any Global Security;

          (4)  the date or dates on which the principal of the Securities of the
     series, or any Tranche thereof, is payable;

          (5)  the rate or rates at which the Securities of the series, or any
     Tranche thereof, shall bear interest, if any (including the rate or rates
     at which overdue principal shall bear interest, if different from the rate
     or rates at which such Securities shall bear interest prior to Maturity,
     and, if applicable, the rate or rates at which overdue premium or interest
     shall bear interest, if any), or any formulary or other method or other
     means by which any such rate or rates shall be determined, by reference to
     an index or other fact or event ascertainable outside this Indenture or
     otherwise; the date or dates from which such interest shall accrue, the
     Interest Payment Dates on which such interest shall be payable and the
     Regular Record Date for the interest payable on any Interest Payment Date
     or any formulary or other method or other means by which such date or dates
     shall be determined, by reference to an index or other fact or event
     ascertainable outside of this Indenture or otherwise (without regard to any
     provisions for redemption, prepayment, acceleration, purchase or extension
     and, if applicable to such series of Securities, or any Tranche thereof,
     the basis points and United States Treasury rate(s) and any other rates to
     be used in calculating the reset rate;

          (6)  the place or places where the principal of (and premium, if any)
     and interest, if any (if such interest is not to be paid as specified in
     Section 307), on Securities of the series, or any Tranche thereof, shall be
     payable;

          (7)  the right of the Company, if any, to defer any payment of
     principal of or interest on the Securities of the series, or any Tranche
     thereof, and the maximum length of any such deferral period;

          (8)  the period or periods within which, the price or prices at which
     and the terms and conditions upon which Securities of the series, or any
     Tranche thereof, may be redeemed, in whole or in part, at the option of the
     Company, pursuant to any sinking fund or otherwise;


                                      -16-
<PAGE>

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

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

          (11) if other than the principal amount thereof, the portion of the
     principal amount of Securities of the series, or any Tranche thereof, which
     shall be payable upon declaration of acceleration of the Maturity thereof
     pursuant to Section 502;

          (12) additional Events of Default with respect to Securities of the
     series, or any Tranche thereof, if any, other than those set forth herein;

          (13) if either or both of Section 1302 and Section 1303 shall be
     inapplicable to the Securities of the series, or any Tranche thereof,
     (provided that if no such inapplicability shall be specified, then both
     Section 1302 and Section 1303 shall be applicable to the Securities of the
     series, or any Tranche thereof);

          (14) if other than U.S. dollars, the currency or currencies or units
     based on or related to currencies in which the Securities of such series,
     or any Tranche thereof, shall be denominated and in which payments or
     principal of, and any premium and interest on, such Securities shall or may
     by payable;

          (15) additional covenants with respect to Securities of the series, or
     any Tranche thereof, if any, other than those set forth herein;

          (16) if other than the Trustee, the identity of the Registrar and any
     Paying Agent; and

          (17) any exceptions to Section 113 or in the definition of "Business
     Day" with respect to Securities of the series, or any Tranche thereof,

          (18) any other terms of the Securities of the series, or any Tranche
     thereof (which terms shall not be inconsistent with the provisions of this
     Indenture).


                                      -17-
<PAGE>

          All Securities of any one series shall be substantially identical
except as to denomination and except as may otherwise be provided in or pursuant
to such Board Resolution and set forth in such Officer's Certificate or in any
such indenture supplemental hereto.

          With respect to Securities of a series subject to a Periodic Offering,
the indenture supplemental hereto or the Board Resolution which establishes such
series, or the Officer's Certificate pursuant to such Board Resolution, may
provide general terms or parameters for Securities of such series and provide
either that the specific terms of Securities of such series, or any Tranche
thereof, shall be specified in a Company Order or that such terms shall be
determined by the Company or its agents in accordance with procedures specified
in a Company Order as contemplated by Section 303.

          Anything herein to the contrary notwithstanding, the Trustee shall be
under no obligation to authenticate and deliver Securities of any series the
terms of which, established as contemplated by this Section, would affect the
rights, duties, obligations, liabilities or immunities of the Trustee under this
Indenture.

SECTION 302.   DENOMINATIONS.

          The Securities shall be issuable in registered form without coupons in
such denominations as shall be specified as contemplated by Section 301.  In the
absence of any such provisions with respect to the Securities of any series, or
any Tranche thereof, the Securities of such series or Tranche shall be issuable
in denominations of $1,000 and any integral multiple thereof.

SECTION 303.   EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

          The Securities 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 reproduced thereon attested by its
Secretary or one of its Assistant Secretaries.  The signature of any of these
officers on the Securities may be manual or facsimile.  The seal of the Company
may be in the form of a facsimile thereof and may be impressed, affixed,
imprinted or otherwise reproduced on the Securities.  Typographical and other
minor errors or defects in any such reproduction of the seal or any such
signature shall not affect the validity or enforceability of any Security that
has been duly authenticated and delivered by the Trustee.

          Securities 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

                                      -18-
<PAGE>

to the authentication and delivery of such Securities or did not hold such
offices at the date of such Securities.

          At any time and from time to time after the original execution and
delivery of this Indenture, the Company may deliver Securities of any series,
executed by the Company, to the Trustee for authentication.  Except as otherwise
provided in this Article Three, the Trustee shall thereupon authenticate and
make available for delivery, or cause to be authenticated and delivered, said
Securities to or upon a Company Order, without any further action by the Issuer;
PROVIDED, HOWEVER, that the Trustee shall authenticate and make available for
delivery Securities of such series for original issue from time to time in the
aggregate principal amount established for such series pursuant to such
procedures, acceptable to the Trustee and to such recipients, as may be
specified from time to time by a Company Order.  The Stated Maturity, original
issue dates, interest rates and any other terms of the Securities of such
series, or any Tranche thereof, shall be determined by or pursuant to such
Company Order and procedures.  If provided for in such procedures, such Company
Order may authorize authentication and delivery pursuant to oral instructions
from the Company or its duly authorized agent, which instructions shall be
promptly confirmed in writing.

          In authenticating the Securities of such series and accepting the
responsibilities under this Indenture in relation to such Securities, the
Trustee shall be entitled to receive, prior to the initial authentication of the
Securities of such series, and (subject to Section 601) shall be fully protected
in relying upon:

          (1)  a Board Resolution relating thereto certified by the Secretary or
     Assistant Secretary of the Company;

          (2)  an Officer's Certificate or an executed supplemental indenture
     setting forth the terms of such Securities as provided in Section 301;

          (3)  an Officer's Certificate which shall state that all conditions
     precedent provided for in this Indenture relating to the issuance of such
     Securities have been complied with, that no Event of Default with respect
     to any series of Securities, or any Tranche thereof, has occurred and is
     continuing and that the issuance of such Securities does not constitute and
     will not result in (i) any Event of Default or any event or condition,
     which, upon the giving of notice or the lapse of time or both, would become
     an Event of Default or (ii) any default under the provisions of any other
     instrument or agreement by which the Company is bound; and

          (4)  an Opinion of Counsel, which shall state:


                                      -19-
<PAGE>

          (a)  that the form or forms of such Securities have been duly
     authorized by the Company and have been established in conformity with the
     provisions of this Indenture;

          (b)  that the term or terms of such Securities have been duly
     authorized by the Company and have been established in conformity with the
     provisions of this Indenture;

          (c)  that such Securities, 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 constitute valid and
     legally binding obligations of the Company, enforceable in accordance with
     their terms, except to the extent enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium and other
     similar laws affecting the enforcement of creditors' rights generally and
     by the effect of general principles of equity (regardless of whether
     enforceability is considered in a proceeding in equity or at law); and

          (d)  that no consent, approval, authorization, order, registration or
     qualification of or with any court or any governmental agency or body
     having jurisdiction over the Company is required for the execution and
     delivery of such Securities by the Company, except such as have been
     obtained (except that no opinion need be expressed as to state securities
     or Blue Sky laws).

If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture in a manner that in the
written opinion of counsel to the Trustee (which counsel may be an employee of
the Trustee) such authentication may not lawfully be made or would involve the
Trustee in personal liability.

          Notwithstanding the provisions of Section 301 and of the immediately
preceding paragraph, with respect to Securities of a series subject to a
Periodic Offering, the Trustee shall be entitled to receive the Officer's
Certificate otherwise required pursuant to Section 303(3) and the Opinion of
Counsel required by Section 303(4) only once at or prior to the time of the
first authentication and delivery of such Securities (provided that such Opinion
of Counsel addresses the authentication and delivery of all such Securities) and
that, in lieu of the opinions described in clauses (b) and (c) above, Counsel
may opine that:

               (x)  when the terms of such Securities shall have been
          established pursuant to a Company Order or Orders or pursuant to such
          procedures as may be specified from


                                      -20-
<PAGE>

          time to time by a Company Order or Orders, all as contemplated by and
          in accordance with the instrument or instruments delivered pursuant to
          clause (a) above, such terms will have been duly authorized by the
          Company and will have been established in conformity with the
          provisions of this Indenture; and

               (y)  when such Securities shall have been authenticated and
          delivered by the Trustee in accordance with this Indenture and the
          Company Order or Orders or the specified procedures referred to in
          paragraph (x) above and issued and delivered by the Company in the
          manner and subject to any conditions specified in such Opinion of
          Counsel, such Securities will constitute valid obligations of the
          Company enforceable in accordance with their terms except to the
          extent enforceability may be limited by applicable bankruptcy,
          insolvency, reorganization, moratorium and other similar laws
          affecting the enforcement of creditors rights generally and by the
          effect of general principles of equity (regardless of whether
          enforceability is considered in a proceeding in equity or at law).

          With respect to Securities of a series subject to a Periodic Offering,
the Trustee may conclusively rely, as to the authorization by the Company of any
of such Securities, the forms and terms thereof, the validity thereof and the
compliance of the authentication and delivery thereof with the terms and
conditions of this Indenture, upon the Opinion or Opinions of Counsel, the
Officer's Certificate and the certificates and other documents delivered
pursuant to this Section 303 at or prior to the time of the first authentication
and delivery of Securities of such series until any of such opinions,
certificates or other documents have been superseded or revoked or expire by
their terms; PROVIDED, HOWEVER, that any request by the Company to the Trustee
to authenticate and deliver Securities of such series shall constitute a
representation and warranty by the Company that as of the date of such request
the statements made in the most recent Officer's Certificate delivered pursuant
to Section 303(3) are true and correct as if made on and as of the date thereof.

          If the Company shall establish pursuant to Section 301 that the
Securities of a series, or any Tranche thereof, are to be issued in the form of
one or more Global Securities, then the Company shall execute and the Trustee
shall, in accordance with this Section and the Company Order with respect to the
authentication and delivery of such series or Tranche, authenticate and deliver
one or more Global Securities that (i) shall be in an aggregate amount equal to
the aggregate principal amount specified in such Company Order, (ii) shall be
registered in the name of the Depository therefor or its nominee, and (iii)


                                      -21-
<PAGE>

shall be made available for delivery by the Trustee to such Depository or
pursuant to such Depository's instruction.

          Each Depository designated pursuant to Section 301 must, at the time
of its designation and at all times while it serves as Depository, be a clearing
agency registered under the Exchange Act and any other applicable statute or
regulation.

          Unless otherwise provided for in the form of Security, each Security
shall be dated the date of its authentication and except that any substitute
Security under Section 306 shall be dated so that neither gain nor loss in
interest shall result from any mutilation, destruction, loss or theft of the
relevant Predecessor Security.

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

SECTION 304.   TEMPORARY SECURITIES.

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

          In the case of Securities of any series, or any Tranche thereof, such
temporary Securities may be in global form, representing all or a portion of the
Outstanding Securities of such series or Tranche.

          Except in the case of temporary Securities in global form (which shall
be exchanged in accordance with the provisions of Section 305), if temporary
Securities of any series, or any Tranche thereof, are issued, the Company will
cause definitive Securities of that series or Tranche thereof to be prepared
without unreasonable delay. After the preparation of definitive Securities of
such series, or any Tranche thereof, the temporary Securities of such series or
Tranche shall be exchangeable for definitive Securities of such series or
Tranche thereof upon surrender of the temporary Securities of such series or
Tranche thereof at the office or agency of the Company in a Place of Payment for
that series or Tranche without charge to the Holder.


                                      -22-
<PAGE>

Upon surrender for cancellation of any one or more temporary Securities of any
series, or any Tranche thereof, the Company shall execute and the Trustee shall
authenticate and make available for delivery in exchange therefor a like
principal amount of definitive Securities of the same series, or Tranche
thereof, of authorized denominations and of like tenor.  Until so exchanged, the
temporary Securities of any series, or any Tranche thereof, shall in all
respects be entitled to the same benefits under this Indenture as definitive
Securities of such series, or any Tranche thereof.

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 and in any other
office or agency of the Company in a Place of Payment being herein sometimes
collectively referred to as the "SECURITY REGISTER") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for the
registration of Securities of each series, or Tranche thereof, and of
registration of transfers of Securities of each series, or Tranche thereof.  The
Trustee is hereby appointed "SECURITY REGISTRAR" for the purpose of registering
Securities and transfers of Securities as herein provided.

          Upon surrender for registration of transfer of any Security of any
series or any Tranche thereof, at the office or agency of the Company in the
Place of Payment for that series or Tranche thereof, the Company shall execute,
and the Trustee shall authenticate and make available for delivery, in the name
of the designated transferee or transferees, one or more new Securities of the
same series and Tranche, of any authorized denominations and of a like aggregate
principal amount and Stated Maturity.

          At the option of the Holder, Securities of any series or any Tranche
thereof, may be exchanged for other Securities of the same series and Tranche,
of any authorized denominations and of a like aggregate principal amount and
Stated Maturity, upon surrender of the Securities to be exchanged at such office
or agency. Whenever any Securities are so surrendered for exchange, the Company
shall execute, and the Trustee shall authenticate and make available for
delivery, the Securities which the Holder making the exchange is entitled to
receive.

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

          (1)  Each Global Security authenticated under this Indenture shall be
     registered in the name of the Depository designated for such Global
     Security or a nominee thereof and delivered to such Depository or a nominee
     thereof or custodian therefor, and each such Global Security shall


                                      -23-
<PAGE>

     constitute a single Security for all purposes of this Indenture.

          (2)  Notwithstanding any other provision in this Indenture, no Global
     Security may be exchanged in whole or in part for Securities registered,
     and no transfer of a Global Security in whole or in part may be registered,
     in the name of any Person other than the Depository for such Global
     Security or a nominee thereof unless (A) such Depository (i) has notified
     the Company that it is unwilling or unable to continue as Depository for
     such Global Security 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 Security 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 Security
     for other Securities may be made in whole or in part, and all Securities
     issued in exchange for a Global Security or any portion thereof shall be
     registered in such names as the Depository for such Global Security shall
     direct.

          (4)  Every Security authenticated and delivered upon registration of
     transfer of, or in exchange for or in lieu of, a Global Security or any
     portion thereof, whether pursuant to this Section, Section 304, 306, 906 or
     1107 or otherwise, shall be authenticated and delivered in the form of, and
     shall be, a Global Security, unless such Security is registered in the name
     of a Person other than the Depository for such Global Security or a nominee
     thereof.

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

          Every Security 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 Security Registrar duly executed, by the
Holder thereof or his attorney duly authorized in writing.

          Unless otherwise provided in the Securities to be transferred or
exchanged, no service charge shall be made for any registration of transfer or
exchange of Securities, 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 Securities,


                                      -24-
<PAGE>

other than exchanges pursuant to Section 304, 906 or 1107 not involving any
transfer.

          The Company shall not be required (i) to issue, register the transfer
of or exchange Securities of any series, or any Tranche thereof, during a period
beginning at the opening of business 15 days before the day of the mailing of a
notice of redemption of Securities of that series or Tranche selected for
redemption under Section 1103 and ending at the close of business on the day of
such mailing, or (ii) to register the transfer of or exchange any Security so
selected for redemption in whole or in part, except the unredeemed portion of
any Security being redeemed in part.

SECTION 306.   MUTILATED, DESTROYED, LOST AND STOLEN SECURITIES.

          If any mutilated Security is surrendered to the Trustee, the Company
shall execute and the Trustee shall authenticate and make available for delivery
in exchange therefor a new Security of the same series and Tranche, 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 Security
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 Security has been acquired by a bona fide
purchaser, the Company shall execute and upon its request the Trustee shall
authenticate and make available for delivery, in lieu of any such destroyed,
lost or stolen Security, a new Security of the same series and Tranche, and of
like tenor and principal amount and bearing a number not contemporaneously
outstanding.

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

          Upon the issuance of any new Security 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 Security issued pursuant to this Section in lieu of any
destroyed, lost or stolen Security shall constitute an original additional
contractual obligation of the Company, whether or not the destroyed, lost or
stolen Security 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 Securities of that series duly issued hereunder.


                                      -25-
<PAGE>

          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 Securities.

SECTION 307.   PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.

          Unless otherwise specified as contemplated by Section 301 with respect
to the Securities of any series, or Tranche thereof, interest on any Security
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 Security (or one or
more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest at the office or agency of any Paying
Agent therefor; provided however, that unless otherwise specified as
contemplated by Section 301 with respect to the Securities of any series, or any
Tranche thereof, interest on any Security shall be paid by check mailed to the
address of the Person entitled thereto as such address appears on the Security
Register.

          Any interest on any Security of any series, or Tranche thereof, 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 Securities of such series or Tranche
     thereof (or their respective Predecessor Securities) 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 Security of such series or any Tranche
     thereof 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 Section 307 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


                                      -26-
<PAGE>

     the expense of the Company, shall cause notice of the proposed payment of
     such Defaulted Interest and the Special Record Date therefor to be mailed,
     first-class postage prepaid, to each Holder of Securities of such series or
     any Tranche thereof at his address as it appears in the Security Register,
     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 Securities of such series or any Tranche
     thereof (or their respective Predecessor Securities) 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
     Securities of any series, or any Tranche thereof, in any other lawful
     manner not inconsistent with the requirements of any securities exchange on
     which such Securities 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 Section 307, such manner
     of payment shall be deemed practicable by the Trustee.

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

SECTION 308.   PERSONS DEEMED OWNERS.

          Prior to due presentment of a Security 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 Security is registered as the owner of such
Security for the purpose of receiving payment of principal of (and premium, if
any) and (subject to Section 307) interest, if any, on such Security and for all
other purposes whatsoever, whether or not such Security 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.

          None of the Company, the Trustee or any agent of the Company or the
Trustee shall have any responsibility or liability for any aspect of the records
relating to or payments made on account of beneficial ownership interest of a
Security in global form, or for maintaining, supervising or reviewing any
records relating to such beneficial ownership interest. Notwithstanding the
foregoing, with respect to any Security in global form, nothing herein shall
prevent the Company or the Trustee or any agent of the Company or the Trustee
from giving effect to any written certification, proxy or other authorization
furnished by


                                      -27-
<PAGE>

any Depository (or its nominee), as a Holder, with respect to such Security in
global form or impair, as between such Depository and owners of beneficial
interests in such Security in global form, the operation of customary practices
governing the exercise of the right of such Depository (or its nominee) as
holder of such Security in global form.

SECTION 309.   CANCELLATION.

          All Securities 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 Securities previously authenticated and
delivered hereunder which the Company may have acquired in any manner
whatsoever, and all Securities so delivered shall be promptly cancelled by the
Trustee.  No Securities shall be authenticated in lieu of or in exchange for any
Securities cancelled as provided in this Section, except as expressly permitted
by this Indenture.  All cancelled Securities shall be held by the Trustee and
shall be returned to the Company upon written request.

SECTION 310.   COMPUTATION OF INTEREST.

          Except as otherwise specified as contemplated by Section 301 for
Securities of any series, or any Tranche thereof, interest, if any, on the
Securities of each series shall be computed on the basis of a 360 day year
consisting of twelve 30-day months and, with respect to any period less than a
full calendar month, on the basis of the actual number of days elapsed during
such period in relation to the deemed 30 days of such month.


                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401.   SATISFACTION AND DISCHARGE OF INDENTURE.

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

          (1)  either

          (A)  all Securities theretofore authenticated and delivered (other
than (i) Securities which have been destroyed,


                                      -28-
<PAGE>

lost or stolen and which have been replaced or paid as provided in Section 306
and (ii) Securities for whose payment money or U.S. Government Obligations 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 1008) have been delivered to the Trustee for cancellation;
or

          (B)  all such Securities 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 with the
Trustee as trust funds in trust for the purpose (a) money in the necessary
amount or (b) U.S. Government Obligations, the principal of and the interest on
which when due, and without any regard to reinvestment thereof, in the opinion
of an independent accountant, and, in the opinion of the officers of the Company
executing an Officer's Certificate to that effect, will provide moneys which,
together with the moneys, if any, deposited with or held by the Trustee, shall
be sufficient to pay when due the principal of, premium, if any, and interest
due and to become due on said Securities or portions thereof on the Redemption
Date or the Stated Maturity thereof, as the case may be, in trust to pay and
discharge the entire indebtedness on such Securities not theretofore delivered
to the Trustee for cancellation, for principal (and premium, if any) and
interest, if any, to the date of such deposit (in the case of Securities which
have become due and payable) or 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 Officer's Certificate
and an Opinion of Counsel, each stating that all conditions precedent provided
for herein 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 607, the obligations of
the Company to any Authenticating Agent under Section 614 and, if money or U.S.
Government Obligations shall have been deposited with the Trustee pursuant


                                      -29-
<PAGE>

to subclause (B) of clause (1) of this Section, the obligations of the Trustee
under Section 402 and the last paragraph of Section 1008 shall survive.

SECTION 402.   APPLICATION OF TRUST MONEY.

          Subject to the provisions of the last paragraph of Section 1008, all
money or U.S. Government Obligations deposited with the Trustee pursuant to
Section 401 shall be held in trust and applied by it, in accordance with the
provisions of the Securities 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 premium, if any) and interest, if any, for whose payment such
money or U.S. Government Obligations has been deposited with or received by the
Trustee.


                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501.   EVENTS OF DEFAULT.

          "EVENT OF DEFAULT," wherever used herein with respect to the
Securities of any series means any one of the following events:

          (1)  failure to pay interest on any Security of that series when such
interest becomes due and payable and such failure continues for a period of 30
days and the time for payment of such interest has not been extended; provided,
however that if the Company is permitted by the terms of the Securities of the
applicable series to defer the payment in question, the date on which such
payment is due and payable shall be the date on which the Company is required to
make payment following such deferral, if such deferral has been elected pursuant
to the terms of the Securities of that series; or

          (2)  failure to pay principal of (or premium, if any, on) any Security
of that series when the same becomes due and payable at Maturity (including
redemptions under Article Eleven but excluding any failure by the Company to
deposit money with the Trustee in connection with any redemption at the option
of the Company) and the time for payment of such principal (or premium, if any),
has not been extended; provided, however, that if the Company is permitted by
the terms of the Securities of the applicable series to defer the payment in
question, the date on which such payment is due and payable shall be the date on
which the Company is required to make payment following such deferral, if such
deferral has been elected pursuant to the terms of the Securities of that
series; or


                                      -30-
<PAGE>

          (3)  the Company fails to observe or perform any of its other
covenants, warranties or agreements in the Securities of that series or in this
Indenture (other than a covenant, agreement 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 Securities other than that series), and the failure to observe or
perform continues for the period and after the notice specified in the last
paragraph of this Section; or

          (4)  the Company pursuant to or within the meaning of any Bankruptcy
Law (A) commences a voluntary case or proceeding under any Bankruptcy Law with
respect to itself, (B) consents to the entry of a judgment, decree or order for
relief against it in an involuntary case or proceeding under any Bankruptcy Law,
(C) consents to or acquiesces in the institution of bankruptcy or insolvency
proceedings against it, (D) applies for, consents to or acquiesces in the
appointment of or taking possession by a Custodian of the Company or for any
material part of its property, (E) makes a general assignment for the benefit of
its creditors, (F) admits in writing its inability to pay its debts generally as
they become due, or (G) takes any corporate action in furtherance of or to
facilitate, conditionally or otherwise, any of the foregoing; or

          (5)  (i)  a court of competent jurisdiction enters a judgment, decree
or order for relief in respect of the Company in an involuntary case or
proceeding under any Bankruptcy Law which shall (A) approve as properly filed a
petition seeking reorganization, arrangement, adjustment or composition in
respect of the Company, (B) appoint a Custodian of the Company or for any
material part of its property or (C) order the winding-up or liquidation of its
affairs, and such judgment, decree or order shall remain unstayed and in effect
for a period of 60 consecutive days; or (ii) any bankruptcy or insolvency
petition or application is filed, or any bankruptcy or insolvency proceeding is
commenced against the Company and such petition, application or proceeding is
not dismissed within 60 days; or (iii) a warrant of attachment is issued against
any material portion of the property of the Company which is not released within
60 days of service; or

          (6)  failure to pay any installment of interest, when the same shall
become due and payable, on any other series of Securities issued or hereafter
issued pursuant to this Indenture and such failure shall continue for a period
of thirty days, or failure to pay the principal of (or premium, if any, on) any
such other series of Securities when the same shall become due and payable at
Maturity (including upon redemption but excluding any failure by the Company to
deposit money with the Trustee in connection with any redemption at the option
of the Company), and the time for payment of such interest or principal (or
premium, if any) shall not have been extended; provided, however, that if


                                      -31-
<PAGE>

the Company is permitted by the terms of the Securities of the applicable series
to defer the payment in question, the date on which such payment is due shall be
the date on which the Company is required to make payment following such
deferral, if such deferral has been elected pursuant to the terms of the
Securities of that series; or

          (7)  any other Event of Default provided with respect to Securities of
that series as contemplated by Section 301.

          A Default under clause (3) above is not an Event of Default until the
Trustee or the Holders of at least 25% in aggregate principal amount of the
Outstanding Securities of that series notify the Company in writing of the
Default and the Company does not cure the Default within 60 days after receipt
of the notice.  The notice must specify the Default, demand that it be remedied
and state that the notice is a "Notice of Default".  When a Default under clause
(3) above is cured within such 60-day period, it ceases.

SECTION 502.   ACCELERATION OF MATURITY; RESCISSION AND ANNULMENT.

          If an Event of Default with respect to Securities of any series,
(other than an Event of Default specified in clause (4) or (5) of Section 501)
occurs and is continuing, the Trustee by notice in writing to the Company, or
the Holders of at least 25% in aggregate principal amount of the Outstanding
Securities of the affected series by notice in writing to the Company and the
Trustee, may declare the unpaid principal of and accrued interest, if any, to
the date of acceleration (or, if the Securities of that series, or any Tranche
thereof,  are Original Issue Discount Securities, such portion of the principal
amount as may be specified in the terms of that series) on all the Outstanding
Securities of that series, to be due and payable immediately and, upon any such
declaration, the Outstanding Securities of that series (or specified principal
amount) shall become and be immediately due and payable.

          If an Event of Default specified in clause (4) or (5) of Section 501
occurs, all unpaid principal of and accrued interest, if any, on the Outstanding
Securities of all series (or specified principal amount) shall ipso facto become
and be immediately due and payable without any declaration or other act on the
part of the Trustee or any Holder.

          The Holders of a majority in principal amount of the Outstanding
Securities of the affected series (subject to, in the case of any series of
Securities held as trust assets of a PSCo Trust, obtaining the consent of the
holders of the Trust Securities of such PSCo Trust as may be required by the
applicable declaration of such PSCo Trust) by notice to the Trustee may rescind
an acceleration and its consequences if (i) all existing Events of Default,
other than the nonpayment of the


                                      -32-
<PAGE>

principal and interest of the Securities of that series that has become due
solely by such declaration of acceleration, have been cured or waived, (ii) to
the extent the payment of such interest is lawful, interest on overdue
installments of interest and overdue principal that has become due otherwise
than by such declaration of acceleration have been paid, (iii) the rescission
would not conflict with any judgment or decree of a court of competent
jurisdiction and (iv) all payments due to the Trustee and any predecessor
Trustee under Section 607 have been made.

SECTION 503.   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 Security
when such interest becomes due and payable and such default continues for a
period of 30 days, or

          (2)  default is made in the payment of the principal of (or premium,
if any, on) any Security at the Maturity thereof,

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

          If the Company fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company or any other obligor upon such Securities and collect the
moneys adjudged or decreed to be payable in the manner provided by law out of
the property of the Company or any other obligor upon such Securities, wherever
situated.

          If an Event of Default with respect to any Securities occurs and is
continuing, the Trustee may in its discretion proceed to protect and enforce its
rights and the rights of the Holders thereof 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
secure any other proper remedy.


                                      -33-
<PAGE>

SECTION 504.   TRUSTEE MAY FILE PROOFS OF CLAIM.

          In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the Company or any other obligor upon the
Securities or the property of the Company or of such other obligor or their
creditors, the Trustee (irrespective of whether the principal of the Securities
shall then be due and payable as therein expressed or by declaration or
otherwise and irrespective of whether the Trustee shall have made any demand on
the Company for the payment of overdue principal or interest) shall be entitled
and empowered, by intervention in such proceeding or otherwise,

            (i)     to file and prove a claim for the whole amount of principal
     (and premium, if any) and interest, if any, owing and unpaid in respect of
     the Securities and to file such other papers or documents as may be
     necessary or advisable in order to have the claims of the Trustee
     (including any claim for the reasonable compensation, expenses,
     disbursements and advances of the Trustee, its agent and counsel) and of
     the Holders allowed in such judicial proceedings, and

           (ii)     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, sequestrator 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 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 607.

          Nothing herein contained 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 Securities
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.

SECTION 505.   TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF SECURITIES.

          All rights of action and claims under this Indenture or the Securities
may be prosecuted and enforced by the Trustee without the possession of any of
the Securities 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


                                      -34-
<PAGE>

compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, be for the ratable benefit of the Holders of the Securities in
respect of which such judgment has been recovered.

SECTION 506.   APPLICATION OF MONEY COLLECTED.

          Any money collected by the Trustee pursuant to this Article in respect
of the Securities of any series 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 premium, if any) or interest, if any, upon
presentation of the Securities in respect of which moneys have been collected
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 607 applicable to such series;

          Second:  To the payment of the amounts then due and unpaid for
principal of (and premium, if any) and interest, if any, on the Securities 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 Securities of such series for principal (and premium, if
any) and interest, if any, respectively; and

          Third:  To the Company.

          The Trustee may fix a record date and payment date for any payment to
Holders pursuant to this Section 506.  At least fifteen (15) days before such
record date, the Trustee shall mail to each Holder and the Company a notice that
states the record date, the payment date and the amount to be paid.

SECTION 507.   LIMITATION ON SUITS.

          No Holder of any series of Securities 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:

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

          (2)  the Holders of not less than 25% in principal amount of the
Outstanding Securities of the affected 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;


                                      -35-
<PAGE>

          (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 Securities of the affected series; it being
understood and intended that no one or more of Holders of Securities of any
affected series 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 Holders of Securities of the affected series.

SECTION 508.   UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, PREMIUM AND
               INTEREST.

          Notwithstanding any other provision in this Indenture, the Holder of
any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of (and premium, if any) and (subject to
Section 307) interest, if any, on such Security on the Stated Maturity or
Maturities expressed in such Security (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.
Notwithstanding any other provision of this Indenture, if the Securities of a
series are then held by a PSCo Trust, each holder of Preferred Securities of
such PSCo Trust shall have the right to bring suit directly against the Company
for the enforcement of payment to such holder in respect of Securities of such
series in a principal amount equal to the aggregate liquidation amount of the
Preferred Securities of such holder.

SECTION 509.   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 has been instituted.


                                      -36-
<PAGE>

SECTION 510.   RIGHTS AND REMEDIES CUMULATIVE.

          Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities 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 511.   DELAY OR OMISSION NOT WAIVER.

          No delay or omission of the Trustee or of any Holder 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 512.   CONTROL BY HOLDERS.

          The Holders of a majority in principal amount of the Outstanding
Securities of any affected 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 Securities 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 Section 601, the Trustee need not take any action
which might involve the Trustee in personal liability or be unduly prejudicial
to the Holders not joining therein.

SECTION 513.   WAIVER OF PAST DEFAULTS.

          The Holders of not less than a majority in principal amount of the
Outstanding Securities of any affected series (or, if the affected series of
Securities is held by a PSCo Trust, the holders of at least a majority of the
aggregate liquidation amount of the Preferred Securities of such PSCo Trust) may
by written notice to the Trustee on behalf of the Holders of all the Securities
of such series waive any Default or Event of Default


                                      -37-
<PAGE>

with respect to such series and its consequences, except a Default or Event of
Default

          (1)  in respect of the payment of the principal of (or premium, if
any) or interest, if any, on any Security of such series, or

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

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

SECTION 514.   UNDERTAKING FOR COSTS.

          All parties to this Indenture agree, and each Holder of any Security
by his acceptance thereof shall be deemed to have agreed, that any court may in
its discretion require, 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, the filing by any party litigant in such
suit of an undertaking to pay the costs of such suit, and that such court may in
its discretion assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in such suit, having due regard to the merits and
good faith of the claims or defenses made by such party litigant; but the
provisions of this Section shall not apply to any suit instituted by the
Company, to any suit instituted by the Trustee, to any suit instituted by any
Holder, or group of Holders, holding in the aggregate more than 10% in principal
amount of the Outstanding Securities, or to any suit instituted by any Holder
for the enforcement of the payment of the principal of (or premium, if any) or
interest, if any, on any Security on or after the Stated Maturity or Maturities
expressed in such Security (or, in the case of redemption, on or after the
Redemption Date).


                                   ARTICLE SIX

                                   THE TRUSTEE

SECTION 601.   CERTAIN DUTIES AND RESPONSIBILITIES OF THE TRUSTEE.

          The Trustee hereby accepts the Trusts herein created.  The Trustee
further undertakes and agrees, as follows:


                                      -38-
<PAGE>

          (a)  Except during the continuance of an Event of Default, the
Trustee's duties and responsibilities under this Indenture shall be governed by
Section 315(a) of the Trust Indenture Act.

          (b)  In case an Event of Default has occurred and is continuing, and
is known to the Trustee, the Trustee shall exercise the rights and powers vested
in it by this Indenture, and shall use the same degree of care and skill in
their exercise, as a prudent man would exercise or use under the circumstances
in the conduct of his own affairs.

          (c)  None of the provisions of Section 315(d) of the Trust Indenture
Act shall be excluded from this Indenture.

SECTION 602.   NOTICE OF DEFAULTS.

          Within 30 days after the occurrence of any Default or Event of Default
with respect to any Securities of any series, the Trustee shall give to all
Holders of Securities of that series, as their names and addresses appear in the
Security Register, notice of such Default or Event of Default known to the
Trustee, unless such Default or Event of Default shall have been cured or
waived; provided, however, that, except in the case of a Default or Event of
Default in the payment of the principal of (or premium, if any) or interest, if
any, on any Security or in the payment of any sinking fund installment with
respect to Securities, the Trustee shall be protected in withholding such notice
if and so long as the board of directors, the executive committee or directors
or Responsible Officers of the Trustee in good faith determine that the
withholding of such notice is in the interest of the Holders of the affected
Securities.

SECTION 603.   CERTAIN RIGHTS OF TRUSTEE.

          Subject to the provisions of the Trust Indenture Act:

          (a)  the Trustee may conclusively 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;

          (b)  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 may be sufficiently evidenced by a Board Resolution;

          (c)  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


                                      -39-
<PAGE>

specifically prescribed) may, in the absence of bad faith on its part, rely upon
an Officer's Certificate;

          (d)  the Trustee may consult with counsel of its selection and the
written 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;

          (e)  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 security or indemnity to its reasonable satisfaction
against the costs, expenses and liabilities which might be incurred by it in
compliance with such request or direction;

          (f)  prior to the occurrence of an Event of Default with respect to
the Securities of any series and after the curing or waiving of all such Events
of Default which may have occurred, 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, approval or other paper or document, or the books and records of the
Company, unless requested in writing to do so by the Holders of a majority in
principal amount of the Outstanding Securities of any series; provided, however,
that if the payment within a reasonable time to the Trustee of the costs,
expenses or liabilities likely to be incurred by it in the making of such
investigation is not, in the opinion of the Trustee, reasonably assured to the
Trustee by the security afforded to it by the terms of this Indenture, the
Trustee may require reasonable indemnity against such costs, expenses or
liabilities as a condition to so proceeding; the reasonable expense of every
such investigation shall be paid by the Company or, if paid by the Trustee,
shall be repaid by the Company upon demand;

          (g)  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

          (h)  the Trustee shall not be required 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 its rights or powers.


                                      -40-
<PAGE>

SECTION 604.   NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF SECURITIES.

          The recitals herein and in the Securities, except the Trustee's
certificates of authentication, shall be taken as the statements of the Company,
and the Trustee or any Authenticating Agent assumes no responsibility for their
correctness.  The Trustee makes no representations as to the validity or
sufficiency of this Indenture or of the Securities.  Neither the Trustee nor any
Authenticating Agent shall be accountable for the use or application by the
Company of Securities or the proceeds thereof.

SECTION 605.   MAY HOLD SECURITIES.

          The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities 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, Security
Registrar or such other agent.

SECTION 606.   MONEY HELD IN TRUST.

          Money held by the Trustee in trust hereunder (including amounts held
by the Trustee as Paying Agent) 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 upon
in writing with the Company.

SECTION 607.   COMPENSATION AND REIMBURSEMENT.

          The Company agrees

          (1)  to pay to the Trustee from time to time such compensation for all
     services rendered by it hereunder as the parties shall agree from time to
     time (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, damage, claim or


                                      -41-
<PAGE>

     expense, including taxes (other than taxes based upon or determined or
     measured by the income of the Trustee), incurred without gross 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.

          When the Trustee incurs expenses or renders services in connection
with an Event of Default specified in Section 501(4) or Section 501(5), 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 607 shall survive the discharge of this
Indenture.

SECTION 608.   DISQUALIFICATION; CONFLICTING INTERESTS.

          The Trustee shall be disqualified only where such disqualification is
required by Section 310(b) of the Trust Indenture Act.  Nothing shall prevent
the Trustee from filing with the Commission the application referred to in the
second to last paragraph of Section 310(b) of the Trust Indenture Act.

SECTION 609.   CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

          There shall at all times be a Trustee hereunder which shall be
eligible to act as Trustee under Section 310(a)(1) of the Trust Indenture Act
having a combined capital and surplus of at least $50,000,000 subject to
supervision or examination by federal or State authority.  If such corporation
publishes reports of condition at least annually, pursuant to law or to the
requirements of said supervising or examining authority, then for the purposes
of this Section, the combined capital and surplus of such corporation shall be
deemed to be its combined capital and surplus as set forth in its most recent
report of condition so published.  Neither the Company nor any Person directly
or indirectly controlling, controlled by, or under common control with the
Company may serve as Trustee.  If at any time the Trustee 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 610.   RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

          (a)  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


                                      -42-
<PAGE>

successor Trustee in accordance with the applicable requirements of Section 611.

          (b)  The Trustee may resign at any time with respect to the Securities
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 611 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
Securities of such series.

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

          (d)  If at any time:

          (1)  the Trustee shall fail to comply with Section 310(b) of the Trust
     Indenture Act after written request therefor by the Company or by any
     Holder who has been a BONA FIDE Holder of a Security for at least six
     months; or

          (2)  the Trustee shall cease to be eligible under Section 609 and
     shall fail to resign after written request therefor by the Company or by
     any such Holder of a Security who has been a BONA FIDE Holder of a Security
     for at least six months; 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, (i) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (ii) subject to Section 315(e) of the
Trust Indenture Act, any Holder who has been a bona fide Holder of a Security
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 Securities and the appointment of a successor
Trustee or Trustees.

          (e)  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 Securities of one or more series, the Company, by a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the


                                      -43-
<PAGE>

Securities of one or more or all of such series and that at any time there shall
be only one Trustee with respect to the Securities of any particular series) and
shall comply with the applicable requirements of Section 611.  If, within one
year after such resignation, removal or incapability, or the occurrence of such
vacancy, a successor Trustee with respect to the Securities of any series shall
be appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities 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
611, become the successor Trustee with respect to the Securities of such series
and to that extent supersede the successor Trustee appointed by the Company with
respect to such Securities.  If no successor Trustee with respect to the
Securities of any series shall have been so appointed by the Company or the
Holders and accepted appointment in the manner required by Section 611, any
Holder who has been a bona fide Holder of a Security 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 Securities of such series.

          (f)  The Company shall give notice of each resignation and each
removal of the Trustee with respect to the Securities of any series and each
appointment of a successor Trustee with respect to the Securities of any series
by mailing written notice of such event by first-class mail, postage prepaid, to
all Holders of Securities of such series as their names and addresses appear in
the Security Register.  Each notice shall include the name of the successor
Trustee with respect to the Securities of such series and the address of its
Corporate Trust Office.

SECTION 611.   ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

          (a)  In case of the appointment hereunder of a successor Trustee with
respect to all Securities, 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; 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.

          (b)  In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more


                                      -44-
<PAGE>

(but not all) series, the Company, the retiring Trustee and each successor
Trustee with respect to the Securities of one or more series shall execute and
deliver an 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 Securities 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 Securities, 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 Securities 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 Securities 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 Securities of that or those
series to which the appointment of such successor Trustee relates.

          (c)  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 paragraph (a) or (b) of this Section, as the case may be.

          (d)  No successor Trustee shall accept its appointment unless at the
time of such acceptance such successor Trustee shall be qualified and eligible
under the Trust Indenture Act.

SECTION 612.   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


                                      -45-
<PAGE>

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 Securities 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 Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.

SECTION 613.   PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

          The Trustee shall comply with Section 311(a) of the Trust Indenture
Act, excluding any creditor relationship listed in Section 311(b) of the Trust
Indenture Act.  A Trustee who has resigned or been removed shall be subject to
Section 311(a) of the Trust Indenture Act to the extent indicated therein.

SECTION 614.   APPOINTMENT OF AUTHENTICATING AGENT.

          At any time when any of the Securities remain Outstanding the Trustee
may appoint an Authenticating Agent or Agents with respect to one or more series
of Securities, or any Tranche thereof, which shall be authorized to act on
behalf of, and subject to the direction of, the Trustee to authenticate
Securities of such series or Tranche issued upon exchange, registration of
transfer or partial redemption thereof or pursuant to Section 306, and
Securities 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 Securities 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


                                      -46-
<PAGE>

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 mail written notice of
such appointment by first-class mail, postage prepaid, to all Holders of
Securities of the series, or Tranche thereof, with respect to which such
Authenticating Agent will serve, as their names and addresses appear in the
Security Register.  Any successor Authenticating Agent upon acceptance of its
appointment hereunder shall become vested with all the rights, powers and duties
of its 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 or any Tranche
thereof, is made pursuant to this Section, the Securities of such series or
Tranche may have endorsed thereon, in addition to the Trustee's certificate of
authentication, an alternate certificate of authentication in the following
form:


                                      -47-
<PAGE>


                         FORM OF AUTHENTICATING AGENT'S
                         CERTIFICATE OF AUTHENTICATION
                         ------------------------------

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

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



                                 -----------------------------------------------
                                                                     AS TRUSTEE


                              By
                                 -----------------------------------------------
                                                         AS AUTHENTICATING AGENT



                                 -----------------------------------------------
                                                            AUTHORIZED SIGNATORY

          If all of the Securities of a series may not be originally issued at
one time, and if the Trustee does not have an office capable of authenticating
Securities upon original issuance located in a Place of Payment where the
Company wishes to have Securities of such series authenticated upon original
issuance, the Trustee, if so requested by the Company in writing (which writing
need not comply with Section 102 and need not be accompanied by an Opinion of
Counsel), shall appoint, in accordance with this Section and in accordance with
such procedures as shall be acceptable to the Trustee, an Authenticating Agent
having an office in a Place of Payment designated by the Company with respect to
such series of Securities.


                                  ARTICLE SEVEN

                HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.   COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF HOLDERS.

          The Company will furnish or cause to be furnished to the Trustee:
          (a)  semi-annually, not later than January 15 and July 15 in each
year, a list, in such form as the Trustee may reasonably require, of the names
and addresses of the Holders as of the preceding December 15 or June 15, as the
case may be; and

          (b)  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;


                                      -48-
<PAGE>

PROVIDED, HOWEVER, that so long as the Trustee is the Security Registrar, no
such list shall be required to be furnished.

SECTION 702.   PRESERVATION OF INFORMATION; COMMUNICATIONS TO HOLDERS.

          (a)  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 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar.  The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

          (b)  If three or more Holders (herein referred to as "applicants")
apply in writing to the Trustee, and furnish to the Trustee reasonable proof
that each such applicant has owned a Security for a period of at least six
months preceding the date of such application, and such application states that
the applicants desire to communicate with other Holders with respect to their
rights under this Indenture or under the Securities and is accompanied by a copy
of the form of proxy or other communication which such applicants propose to
transmit, then the Trustee shall, within five Business Days after the receipt of
such application, at its election, either

            (i)     afford such applicants access to the information preserved
     at the time by the Trustee in accordance with Section 702(a); or

           (ii)     inform such applicants as to the approximate number of
     Holders whose names and addresses appear in the information preserved at
     the time by the Trustee in accordance with Section 702(a), and as to the
     approximate cost of mailing to such Holders the form of proxy or other
     communication, if any, specified in such application.

          If the Trustee shall elect not to afford such applicants access to
such information, the Trustee shall, upon the written request of such
applicants, mail to each Holder whose name and address appears in the
information preserved at the time by the Trustee in accordance with Section
702(a) a copy of the form of proxy or other communication which is specified in
such request, with reasonable promptness after a tender to the Trustee of the
material to be mailed and of payment, or provision for the payment, of the
reasonable expenses of mailing, unless within five days after such tender the
Trustee shall mail to such applicants and file with the Commission, together
with a copy of the material to be mailed, a written statement to the effect
that, in the opinion of the Trustee, such mailing would be contrary to the best
interest of the Holders or would be in violation of applicable law.  Such
written statement shall specify the basis of such opinion.  If the Commission,
after opportunity for a hearing upon the objections specified in the


                                      -49-
<PAGE>

written statement so filed, shall enter an order refusing to sustain any of such
objections or if, after the entry of an order sustaining one or more of such
objections, the Commission shall find, after notice and opportunity for hearing,
that all objections so sustained have been met and shall enter an order so
declaring, the Trustee shall mail copies of such material to all such Holders
with reasonable promptness after the entry of such order and the renewal of such
tender; otherwise the Trustee shall be relieved of any obligation or duty to
such applicants respecting their application.

          (c)  Every Holder of Securities, 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 the
disclosure of any such information as to the names and addresses of the Holders
in accordance with Section 702(b), regardless of the source from which such
information was derived, and that the Trustee shall not be held accountable by
reason of mailing any material pursuant to a request made under Section 702(b).

SECTION 703.   REPORTS BY TRUSTEE.

          (a)  Within 60 days after May 15 of each year commencing with the year
1999, the Trustee shall transmit by mail to all Holders of Securities as
provided in Section 313(c) of the Trust Indenture Act, a brief report dated as
of May 15, if required by and in compliance with Section 313(a) of the Trust
Indenture Act.

          (b)  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 Securities are listed, with the Commission and with the Company.  The
Company will notify the Trustee when any Securities are listed on any stock
exchange.

SECTION 704.   REPORTS BY COMPANY.

          The Company shall:

          (1)  file with the Trustee, within 30 days after the Company is
     required to file the same with the Commission, copies of the annual reports
     and of the information, documents and other reports (or copies of such
     portions of any of the foregoing as the Commission may from time to time by
     rules and regulations prescribe) which the Company may be required to file
     with the Commission pursuant to Section 13 or Section 15(d) of the Exchange
     Act; or, if the Company is not required to file information, documents or
     reports pursuant to either of said Sections, then it shall file with the
     Trustee and the Commission, in accordance with rules and regulations
     prescribed from time to time by the Commission, such of the supplementary
     and periodic information, documents and reports which may be required
     pursuant to


                                      -50-
<PAGE>

     Section 13 of the Exchange Act in respect of a security listed and
     registered on a national securities exchange as may be prescribed from time
     to time in such rules and regulations;

          (2)  file with the Trustee and the Commission, in accordance with
     rules and regulations prescribed from time to time by the Commission, such
     additional information, documents and reports with respect to compliance by
     the Company with the conditions and covenants of this Indenture as may be
     required from time to time by such rules and regulations;

          (3)  transmit by mail to all Holders, as their names and addresses
     appear in the Security Register, (a) concurrently with furnishing the same
     to its stockholders, the Company's annual report to stockholders,
     containing certified financial statements, and any other financial reports
     which the Company generally furnishes to its stockholders, and (b) within
     30 days after the filing thereof with the Trustee, such summaries of any
     other information, documents and reports required to be filed by the
     Company pursuant to paragraphs (1) and (2) of this  Section as may be
     required by rules and regulations prescribed from time to time by the
     Commission; and

          (4)  furnish to the Trustee, on or before May 1 of each year, a brief
     certificate from the principal executive officer, principal financial
     officer or principal accounting officer as to his or her knowledge of the
     Company's compliance with all conditions and covenants under this
     Indenture.  For purposes of this paragraph, such compliance shall be
     determined without regard to any period of grace or requirement of notice
     provided under this Indenture.  Such certificate need not comply with
     Section 102.


                                  ARTICLE EIGHT

                 CONSOLIDATION, MERGER, LEASE, SALE OR TRANSFER

SECTION 801.   WHEN COMPANY MAY MERGE, ETC.

          The Company shall not consolidate with, or merge with or into any
other corporation (whether or not the Company shall be the surviving
corporation), or sell, assign, transfer or lease all or substantially all of its
properties and assets as an entirety or substantially as an entirety to any
Person or group of affiliated Persons, in one transaction or a series of related
transactions, unless:

          (1)  either the Company shall be the continuing Person or the Person
     (if other than the Company) formed by such consolidation or with which or
     into which the Company is


                                      -51-
<PAGE>

     merged or the Person (or group of affiliated Persons) to which all or
     substantially all the properties and assets of the Company as an entirety
     or substantially as an entirety are sold, assigned, transferred or leased
     shall be a corporation (or constitute corporations) organized and existing
     under the laws of the United States of America or any State thereof or the
     District of Columbia and shall expressly assume, by an indenture
     supplemental hereto, executed and delivered to the Trustee, in form
     satisfactory to the Trustee, all the obligations of the Company under the
     Securities and this Indenture; and

          (2)  immediately before and after giving effect to such transaction or
     series of related transactions, no Event of Default, and no Default, shall
     have occurred and be continuing.

SECTION 802.   OPINION OF COUNSEL.

          The Company shall deliver to the Trustee prior to the proposed
transaction(s) covered by Section 801 an Officer's Certificate and an Opinion of
Counsel stating that the transaction(s) and such supplemental indenture comply
with this Indenture and that all conditions precedent to the consummation of the
transaction(s) under this Indenture have been met.

SECTION 803.   SUCCESSOR CORPORATION SUBSTITUTED.

          Upon any consolidation by the Company with or merger by the Company
into any other corporation or any lease, sale, assignment, or transfer of all or
substantially all of the property and assets of the Company in accordance with
Section 801, the successor corporation formed by such consolidation or into
which the Company is merged or the successor corporation or affiliated group of
corporations to which such lease, sale, assignment, or transfer 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
corporation or corporations had been named as the Company herein, and
thereafter, except in the case of a lease, the predecessor corporation or
corporations shall be relieved of all obligations and covenants under this
Indenture and the Securities and in the event of such conveyance or transfer,
except in the case of a lease, any such predecessor corporation may be dissolved
and liquidated.


                                      -52-
<PAGE>

                                  ARTICLE NINE

                             SUPPLEMENTAL INDENTURES

SECTION 901.   SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS.

          Without notice to or 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 corporation to the Company
     and the assumption by any such successor of the covenants of the Company
     herein and in the Securities; or

          (2)  to add to the covenants of the Company for the benefit of the
     Holders of all or one or more specified series of Securities or one or more
     specified Tranches thereof (and if such covenants are to be for the benefit
     of fewer than all series of Securities or fewer than all Securities of a
     Series, stating that such covenants are expressly being included solely for
     the benefit of such series or one or more Tranches of such series) or to
     surrender any right or power herein conferred upon the Company; or

          (3)  to add any additional Events of Default with respect to all or
     one or more series of Securities; or

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

          (5)  to change or eliminate any of the provisions of this Indenture,
     provided that any such change or elimination shall become effective only
     when there is no Security Outstanding of any series created prior to the
     execution  of such supplemental indenture which is entitled to the benefit
     of such provision; or

          (6)  to secure the Securities; or

          (7)  to establish the form or terms of Securities 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 Securities of one or
     more series and to add to or change any of the provisions of this Indenture
     as shall be


                                      -53-
<PAGE>

     necessary to provide for or facilitate the administration of the trusts
     hereunder by more than one Trustee, pursuant to the requirements of
     Section 611(b); or

          (9)  to cure any ambiguity, defect or inconsistency or to correct or
     supplement any provision herein which may be defective or inconsistent with
     any other provision herein; or

          (10) to make any change to the provisions hereof or to add other
     provisions with respect to matters or questions arising under this
     Indenture; provided that such changes or additions shall not materially
     adversely affect the interests of the Holders of Securities of any series.

          Without limiting the generality of the foregoing, if the Trust
Indenture Act as in effect at the date of the original execution and delivery of
this Indenture or at any time thereafter shall be amended and

               (x)  if any such amendment shall require one or more changes to
          any provisions hereof or the inclusion herein of any additional
          provisions, or shall by operation of law be deemed to effect such
          changes or incorporate such provisions by reference or otherwise this
          Indenture shall be deemed to have been amended so as to conform to
          such amendment to the Trust Indenture Act, and the Company and the
          Trustee may, without the consent of any Holders, enter into an
          indenture supplemental hereto to evidence such amendment hereof; or

               (y)  if any such amendment shall permit one or more changes to,
          or the elimination of, any provisions hereof which, at the date of the
          original execution and delivery hereof or at any time thereafter, are
          required by the Trust Indenture Act to be contained herein or are
          contained herein to reflect any provisions of the Trust Indenture Act
          as in effect at such date, this Indenture shall be deemed to have been
          amended to effect such changes or elimination, and the Company and the
          Trustee may, without the consent of any Holders, enter into an
          indenture supplemental hereto to evidence such amendment hereof.

          Upon request of the Company, accompanied by a Board Resolution
authorizing the execution of any such supplemental indenture, and upon receipt
by the Trustee of the documents described in (and subject to the last sentence
of) Section 903, the Trustee shall join with the Company in the execution of any
supplemental indenture authorized or permitted by the terms of this Indenture.


                                      -54-
<PAGE>

SECTION 902.   SUPPLEMENTAL INDENTURES WITH CONSENT OF HOLDERS.

          Subject to the provisions of Section 901, with the consent of the
Holders of not less than a majority in aggregate principal amount of the
Securities of all series then Outstanding under this Indenture, considered as
one class, by Act of said Holders delivered to the Company and the Trustee, the
Company 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; provided, however, that if
there shall be Securities of more than one series Outstanding hereunder and if a
proposed supplemental indenture shall directly affect the rights of the Holders
of Securities of one or more, but fewer than all, of such series, then the
consent only of the Holders of a majority in aggregate principal amount of the
Outstanding Securities of all series so directly affected, considered as one
class, shall be required; and provided, further, that if the Securities of any
series shall have been issued in more than one Tranche and if the proposed
supplemental indenture shall directly affect the rights of the Holders of
Securities of one or more, but fewer than all, of such Tranches, then the
consent only of the Holders of a majority in aggregate principal amount of the
Outstanding Securities of all Tranches so directly affected, considered as one
class, shall be required; and provided, further, that no such supplemental
indenture shall without the consent of each Holder affected thereby:

          (1)  change the Stated Maturity of the principal of, or any
     installment of principal of or interest on, any Security, or reduce the
     principal amount thereof or the rate of interest thereon or any premium
     payable upon the redemption thereof or extend the time for payment thereof,
     or reduce the amount of the principal of an Original Issue Discount
     Security that would be due and payable upon a declaration of acceleration
     of the Maturity thereof pursuant to Section 502, or change any Place of
     Payment where, or the coin or currency in which, the principal of any
     Security or any premium or interest thereon is payable, 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 modify the provisions of the Indenture with respect to
     the subordination of the Securities in a manner adverse to any Holder;

          (2)  reduce the percentage in principal amount of the Outstanding
     Securities 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
     Defaults or Events of Default hereunder and their consequences provided for
     in this Indenture; or


                                      -55-
<PAGE>

          (3)  change the redemption provisions (including Article Eleven)
     hereof in a manner adverse to such Holder; or

          (4)  modify any of the provisions of this Section or Section 513,
     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 Security 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, or the deletion of this
     proviso, in accordance with the requirements of Sections 611(b) and 901(8),

provided that, in the case of Outstanding Securities of a series then held by a
PSCo Trust, no such supplemental indenture shall adversely affect the holders of
the Preferred Securities of such PSCo Trust without the prior consent of each
holder of such Preferred Securities.

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

          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 903.   EXECUTION OF SUPPLEMENTAL INDENTURES.

          The Trustee shall sign any supplemental indenture authorized pursuant
to this Article, subject to the last sentence of this Section 903.  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 601) shall be fully protected in relying upon, an Officer's
Certificate and 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.


                                      -56-
<PAGE>

SECTION 904.   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 Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

SECTION 905.   CONFORMITY WITH TRUST INDENTURE ACT.

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

SECTION 906.   REFERENCE IN SECURITIES TO SUPPLEMENTAL INDENTURES.

          Securities 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 Securities 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 Securities of such series.


                                   ARTICLE TEN

                                    COVENANTS

SECTION 1001.  PAYMENTS OF SECURITIES.

          The Company will duly and punctually pay the principal of (and
premium, if any) and interest, if any, on the Securities of each series in
accordance with the terms of such Securities and this Indenture, and will duly
comply with all the other terms, agreements and conditions contained in, or made
in the Indenture for the benefit of, the Securities of such series or any
Tranche thereof.

SECTION 1002.  MAINTENANCE OF OFFICE OR AGENCY.

          The Company will maintain an office or agency in each Place of Payment
where Securities of each series, or any Tranche thereof, may be surrendered for
registration of transfer or exchange or for presentation for payment, and where
notices and demands to or upon the Company in respect of such Securities and
this Indenture may be served.  The Company will give prompt written notice to
the Trustee of the location, and any change in location, of such office or
agency.  If at any time the Company


                                      -57-
<PAGE>

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 address of the Trustee as set
forth in Section 105 hereof.

          The Company may also from time to time designate one or more other
offices or agencies where the Securities of one or more series, or any Tranche
thereof, may be presented or surrendered for any or all such purposes and may
from time to time rescind such designations.  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.

          The Company hereby initially designates the office of The Bank of New
York as such office of the Company.

SECTION 1003.  CORPORATE EXISTENCE.

          Subject to Article 8 hereof, the Company will do or cause to be done
all things necessary to preserve and keep in full force and effect its corporate
existence.

SECTION 1004.  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 material taxes, assessments and
governmental charges levied or imposed upon the Company or upon the income,
profits or property of the Company, and (2) all lawful claims for labor,
materials and supplies which, if unpaid, might by law become a material lien
upon the property of the Company; 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 1005.  COMPLIANCE CERTIFICATES.

          (a)  The Company shall deliver to the Trustee within 90 days after the
     end of each fiscal year of the Company (which fiscal year currently ends on
     December 31), an Officer's Certificate stating whether or not the signer
     knows of any Default or Event of Default by the Company that occurred prior
     to the end of the fiscal year and is then continuing.  If the signer does
     know of such a Default or Event of Default, the certificate shall describe
     each such Default or Event of Default and its status and the specific
     section or sections of this Indenture in connection with which such Default
     or Event of Default has occurred.  The Company shall also promptly notify
     the Trustee in writing should the Company's fiscal year be changed so that
     the end thereof is on any date other than the date on which the


                                      -58-
<PAGE>

     Company's fiscal year currently ends.  The certificate need not comply with
     Section 102 hereof.

          (b)  The Company shall deliver to the Trustee forthwith upon becoming
     aware of a Default or Event of Default (but in no event later than 10 days
     after the occurrence of each Default or Event of Default that is
     continuing), an Officer's Certificate setting forth the details of such
     Default or Event of Default and the action that the Company proposes to
     take with respect thereto and the specific section or sections of this
     Indenture in connection with which such Default or Event of Default has
     occurred.

SECTION 1006.  COMMISSION REPORTS.

          (a)  The Company shall file with the Trustee, within 30 days after it
     files them with the Commission, copies of the quarterly and annual reports
     and of the information, documents, and other reports (or copies of such
     portions of any of the foregoing as the Commission may by rules and
     regulations prescribe) which the Company is required to file with the
     Commission pursuant to Section 13 or 15(d) of the Exchange Act.  If the
     Company is not subject to the requirement of such Section 13 or 15(d) of
     the Exchange Act, the Company shall file with the Trustee, within 30 days
     after it would have been required to file such information with the
     Commission, financial statements, including any notes thereto and, with
     respect to annual reports, an auditors' report by an accounting firm of
     established national reputation and a "Management's Discussion and Analysis
     of Financial Condition and Results of Operations," both comparable to that
     which the Company would have been required to include in such annual
     reports, information, documents or other reports if the Company had been
     subject to the requirements of such Sections 13 or 15(d) of the Exchange
     Act.  The Company also shall comply with the other provisions of Section
     314(a) of the Trust Indenture Act.

          (b)  So long as the Securities remain outstanding, the Company shall
     cause its annual report to stockholders and any other financial reports
     furnished by it to stockholders generally, to be mailed to the Holders at
     their addresses appearing in the register of Securities maintained by the
     Security Registrar in each case at the time of such mailing or furnishing
     to stockholders.  If the Company is not required to furnish annual or
     quarterly reports to its stockholders pursuant to the Exchange Act, the
     Company shall  cause its financial statements, including any notes thereto
     and, with respect to annual reports, an auditors' report by an accounting
     firm of established national reputation and a "Management's Discussion and
     Analysis of Financial Condition and Results of Operations," to be so filed
     with the Trustee and mailed to the Holders within 90 days after the end of


                                      -59-
<PAGE>

     each of the Company's fiscal years and within 45 days after the end of each
     of the first three quarters of each fiscal year.

          (c)  The Company shall provide the Trustee with a sufficient number of
     copies of all reports and other documents and information that the Company
     may be required to deliver to the Holders under this Section 1007.

SECTION 1007.  WAIVER OF STAY, EXTENSION OR USURY 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, and will actively resist any and all efforts to be compelled to take the
benefit or advantage of, any stay or extension law or any usury law or other
law, which would prohibit or forgive the Company from paying all or any portion
of the principal of and/or interest, if any, on the Securities as contemplated
herein, wherever enacted, now or at any time hereafter in force, or which may
affect the covenants or the performance of this Indenture; and (to the extent
that it may lawfully do so) the Company 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.

SECTION 1008.  MONEY FOR SECURITIES 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 Securities, or any Tranche thereof, it will, on or
before each due date of the principal of (and premium, if any) or interest, if
any, on any of the Securities of that series, or any Tranche thereof, segregate
and hold in trust for the benefit of the Persons entitled thereto a sum
sufficient to pay the principal (and premium, if any) or interest, if any, 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 Securities, or any Tranche thereof, it will, prior to each due date of
the principal of (and premium, if any) or interest, if any, on any Securities of
that series, or any Tranche thereof, deposit with a Paying Agent a sum
sufficient to pay the principal (and premium, if any) or interest so becoming
due, such sum to be held in trust for the benefit of the Persons entitled to
such principal, premium or interest, if any, and (unless such Paying Agent is
the Trustee) the Company will promptly notify the Trustee of its action or
failure to so act.


                                      -60-
<PAGE>

          The Company will cause each Paying Agent for any series of Securities,
or any Tranche thereof (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)  hold all sums held by it for the payment of the principal of (and
     premium, if any) or interest, if any, on Securities of that series, or any
     Tranche thereof, in trust for the benefit of the Persons entitled thereto
     until such sums shall be paid to such Persons or otherwise disposed of as
     herein provided;

          (2)  give the Trustee notice of any default by the Company (or any
     other obligor upon the Securities of that series, or any Tranche thereof)
     in the making of any payment of principal (and premium, if any) or
     interest, if any, on the Securities of that series, or any Tranche thereof;
     and

          (3)  at any time during the continuance of any such default, upon the
     written request of the Trustee, forthwith pay to the Trustee all sums so
     held in trust by such Paying Agent.

          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 (and premium, if
any) or interest, if any, on any Security of any series and remaining unclaimed
for two years after such principal (and premium, if any) or interest, if any,
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 Security 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 of 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 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


                                      -61-
<PAGE>

date of such publication, any unclaimed balance of such money then remaining
will be repaid to the Company.


                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

SECTION 1101.  APPLICABILITY OF ARTICLE.

          Securities of any series, or any Tranche thereof, 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 Securities
of any series, or any Tranche thereof) in accordance with this Article.

SECTION 1102.  ELECTION TO REDEEM; NOTICE TO TRUSTEE.

          The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution.  In case of any redemption at the election of
the Company of fewer than all the Securities of any series, or any Tranche
thereof, the Company shall, at least 45 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 and of the principal amount of
Securities to be redeemed.  In the case of any redemption of Securities prior to
the expiration of any restriction on such redemption provided in the terms of
such Securities or elsewhere in this Indenture, the Company shall furnish the
Trustee with an Officer's Certificate evidencing compliance with such
restriction.

SECTION 1103.  SELECTION BY TRUSTEE OF SECURITIES TO BE REDEEMED.

          If fewer than all the Securities of any series, or any Tranche
thereof, are to be redeemed, and if at the time the Company shall have given
notice of redemption to the Trustee in accordance with Section 1102, there shall
not be on file with the Trustee and in effect a Holders' Redemption Agreement,
as hereinafter defined and the particular Securities to be redeemed shall be
selected by the Trustee, from the Outstanding Securities of such series or
Tranche not previously called for redemption, substantially pro rata, by lot or
by any other method as the Trustee considers fair and appropriate and that
complies with the requirements of the principal national securities exchange, if
any, on which such Securities are listed, and which may provide for the
selection for redemption of portions (equal to the minimum authorized
denomination for Securities of that series or Tranche or any integral multiple
thereof) of the principal amount of Securities of such series or Tranche of a
denomination larger than the minimum authorized denomination for Securities of
that series or Tranche; provided that in case the Securities of such series or
Tranche have different terms and maturities, the


                                      -62-
<PAGE>

Securities to be redeemed shall be selected by the Company and the Company shall
give notice thereof to the Trustee; provided however, that if, as indicated in
an Officer's Certificate, the Company shall have offered to purchase all or any
principal amount of the Securities then Outstanding of any series, or any
Tranche thereof, and fewer than all of such Securities as to which such offer
was made shall have been tendered to the Company for such purchase, the Trustee,
if so directed by Company Order, shall select for redemption all or any
principal amount of such Securities which have not been so tendered.

          If at the time the Company shall have given notice of redemption to
the Trustee in accordance with Section 1102, there shall be on file with the
Trustee and in effect a Holders' Redemption Agreement, as hereinafter defined,
then the Trustee shall select, in accordance with the provisions of said
Holders' Redemption Agreement, the Securities or parts thereof to be redeemed.

          For the purposes of this Indenture, the term "Holders' Redemption
Agreement" shall mean an agreement, reasonably satisfactory to the Trustee,
executed as provided in this Section, which provides for the method to be
followed by the Trustee in selecting Securities or parts of Securities for
redemption out of any funds held by the Trustee to be applied to such
redemption.  A Holders' Redemption Agreement may be made with respect to a
single series of Securities, or Tranche thereof, in which case it shall be
executed by or on behalf of the Holders of all Outstanding Securities of such
series or Tranche, or it may be made with respect to all Outstanding Securities,
in which case it shall be executed by or on behalf of the Holders of all
Securities Outstanding hereunder.

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

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

SECTION 1104.  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 Securities to be redeemed, at his address appearing in
the Security Register.

          All notices of redemption shall state:


                                      -63-
<PAGE>

          (1)  the Redemption Date;

          (2)  the Redemption Price;

          (3)  if fewer than all the Outstanding Securities of any series or
     Tranche are to be redeemed, the identification (and, in the case of partial
     redemption, the principal amounts) of the particular Securities to be
     redeemed;

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

          (5)  the place or places where such Securities are to be surrendered
     for payment of the Redemption Price;

          (6)  that the redemption is for a sinking or other fund, if such is
     the case;

          (7)  the CUSIP number, if any, of the Securities to be redeemed; and

          (8)  unless otherwise provided as to a particular series of Securities
     or any Tranche thereof, if at the time of publication or mailing of any
     notice of redemption the Company shall not have deposited with the Trustee
     or Paying Agent and/or irrevocably directed the Trustee or Paying Agent to
     apply, from money held by it available to be used for the redemption of
     Securities, an amount in cash sufficient to redeem all of the Securities
     called for redemption, including accrued interest, if any, to the
     Redemption Date, such notice shall state that it is subject to the receipt
     of the redemption moneys by the Trustee or Paying Agent before the
     Redemption Date (unless such redemption is mandatory) and such notice shall
     be of no effect unless such moneys are so received before such date.

          Notice of redemption of Securities 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.  Notice of mandatory
redemption of Securities shall be given by the Trustee in the name and at the
expense of the Company.

SECTION 1105.  DEPOSIT OF REDEMPTION PRICE.

          Prior to 10:00 a.m., New York Time, on 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 1009) an amount of money sufficient to pay the Redemption
Price of, and (except if the Redemption Date shall be an Interest Payment Date)


                                      -64-
<PAGE>

accrued interest, if any, on, all the Securities which are to be redeemed on
that date.

SECTION 1106.  SECURITIES PAYABLE ON REDEMPTION DATE.

          Notice of redemption having been given as aforesaid, and the Company
having on or before the Redemption Date deposited with the Trustee (and/or
having irrevocably directed the Trustee to apply, from money held by it
available to be used for the redemption of Securities) an amount in cash
sufficient to redeem all of the Securities to be redeemed, the Securities 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 such Securities
shall cease to bear interest.  Upon surrender of any such Security for
redemption in accordance with said notice, such Security shall be paid by the
Company at the Redemption Price, together with accrued interest, if any, to the
Redemption Date; provided, however, that installments of interest whose Stated
Maturity is on or prior to the Redemption Date shall be payable to the Holders
of such Securities, or one or more Predecessor Securities, registered as such at
the close of business on the relevant Regular or Special Record Dates according
to their terms and the provisions of Section 307.

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

SECTION 1107.  SECURITIES REDEEMED IN PART.

          Any Security which is to be redeemed only in part shall be surrendered
at an office or agency of the Company 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 Security without service charge, a new Security or Securities of
the same series and Tranche and Stated Maturity, 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 Security so
surrendered.


                                      -65-
<PAGE>

                                 ARTICLE TWELVE

                                  SINKING FUNDS

SECTION 1201.  APPLICABILITY OF ARTICLE.

          The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of a series or any Tranche thereof, except as
otherwise specified as contemplated by Section 301 for Securities of such
series, or Tranche.

          The minimum amount of any sinking fund payment provided for by the
terms of Securities of any series, or any Tranche thereof, 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 Securities of any series, or any Tranche
thereof, is herein referred to as an "OPTIONAL SINKING FUND PAYMENT".  If
provided for by the terms of Securities of any series, or any Tranche thereof,
the cash amount of any sinking fund payment may be subject to reduction as
provided in Section 1202.  Each sinking fund payment shall be applied to the
redemption of Securities of any series, or any Tranche thereof, as provided for
by the terms of Securities of such series, or any Tranche thereof.

SECTION 1202.  SATISFACTION OF SINKING FUND PAYMENTS WITH SECURITIES.

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

SECTION 1203.  REDEMPTION OF SECURITIES FOR SINKING FUND.

          Not fewer than 45 days prior to each sinking fund payment date for any
series of Securities or any Tranche thereof, the Company will deliver to the
Trustee an Officer's Certificate specifying the amount of the next ensuing
sinking fund payment for that series or Tranche pursuant to the terms of that
series or Tranche, the portion thereof, if any, which is to be satisfied


                                      -66-
<PAGE>

by payment of cash and the portion thereof, if any, which is to be satisfied by
delivering and crediting Securities of that series or Tranche pursuant to
Section 1202 and will also deliver to the Trustee any Securities to be so
delivered.  Not less than 30 days before each such sinking fund payment date the
Trustee shall select the Securities to be redeemed upon such sinking fund
payment date in the manner specified in Section 1103 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 1104.  Such notice having been duly given, the
redemption of such Securities shall be made upon the terms and in the manner
stated in Sections 1106 and 1107.


                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.  APPLICABILITY OF ARTICLE; COMPANY'S OPTION TO EFFECT DEFEASANCE
               OR COVENANT DEFEASANCE.

          Unless pursuant to Section 301 provision is made for the
inapplicability of either or both of (a) Defeasance of the Securities of a
series, or any Tranche thereof, under Section 1302 or (b) Covenant Defeasance of
the Securities of a series, or any Tranche thereof, under Section 1303, then the
provisions of such Section or Sections, as the case may be, together with the
other provisions of this Article, shall be applicable to the Securities of such
series or Tranche, and the Company may at its option by Board Resolution, at any
time, with respect to the Securities of such series, or Tranche, elect to have
either Section 1302 (unless inapplicable) or Section 1303 (unless inapplicable)
be applied to the Outstanding Securities of such series or Tranche upon
compliance with the applicable conditions set forth below in this Article.

SECTION 1302.  DEFEASANCE AND DISCHARGE.

          Upon the Company's exercise of the option provided in Section 1301 to
defease the Outstanding Securities of a particular series or Tranche, the
Company shall be discharged from its obligations with respect to the Outstanding
Securities of such series or Tranche on the date the applicable conditions set
forth in Section 1304 are satisfied (hereinafter, "DEFEASANCE").  Defeasance
shall mean that the Company shall be deemed to have paid and discharged the
entire indebtedness represented by the Outstanding Securities of such series or
Tranche and to have satisfied all its other obligations under such Securities
and this Indenture insofar as such Securities are concerned (and the Trustee, at
the expense of the Company, shall execute proper instruments acknowledging the
same); provided, however, that the following rights, obligations, powers,
trusts, duties and immunities shall survive until otherwise terminated or
discharged hereunder:  (A) the rights of Holders of Outstanding


                                      -67-
<PAGE>

Securities of such series or Tranche to receive, solely from the trust fund
provided for in Section 1304, payments in respect of the principal of (and
premium, if any) and interest, if any, on such Securities when such payments are
due, (B) the Company's obligations with respect to such Securities under
Sections 304, 305, 306, 1002 and 1008, (C) the rights, powers, trusts, duties
and immunities of the Trustee hereunder and (D) this Article.  Subject to
compliance with this Article, the Company may exercise its option with respect
to Defeasance under this Section 1302 notwithstanding the prior exercise of its
option with respect to Covenant Defeasance under Section 1303 in regard to the
Securities of such series or Tranche.

SECTION 1303.  COVENANT DEFEASANCE.

          Upon the Company's exercise of the option provided in Section 1301 to
obtain a Covenant Defeasance with respect to the Outstanding Securities of a
particular series, or Tranche thereof, the Company shall be released from its
obligations under this Indenture (except its obligations under Sections 304,
305, 306, 506, 509, 610, 1001, 1002, 1006, 1007 and 1008) with respect to the
Outstanding Securities of such series, or Tranche thereof, on and after the date
the applicable conditions set forth in Section 1304 are satisfied (hereinafter,
"COVENANT DEFEASANCE"). Covenant Defeasance shall mean that, with respect to the
Outstanding Securities of such series, or Tranche thereof, the Company may omit
to comply with and shall have no liability in respect of any term, condition or
limitation set forth in this Indenture (except its obligations under Sections
304, 305, 306, 506, 509, 610, 1001, 1002, 1005, 1007 and 1008), whether directly
or indirectly by reason of any reference elsewhere herein or by reason of any
reference to any other provision herein or in any other document, and such
omission to comply shall not constitute an Event of Default under Section 501(3)
with respect to Outstanding Securities of such series, and the remainder of this
Indenture and of the Securities of such series or Tranche shall be unaffected
thereby.

SECTION 1304.  CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE.

          The following shall be the conditions to Defeasance under Section 1302
and Covenant Defeasance under Section 1303:

               (1)  the Company shall irrevocably have deposited or caused to be
          deposited with the Trustee (or another trustee satisfying the
          requirements of Section 609 who shall agree to comply with the
          provisions of this Article applicable to it), under the terms of an
          irrevocable trust agreement in form and substance reasonably
          satisfactory to such 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
          Securities, (A) Dollars in an amount, or (B) U.S.


                                      -68-
<PAGE>

          Government Obligations which through the scheduled payment of
          principal and interest in respect thereof in accordance with their
          terms will provide, not later than the due date of any payment, money
          in an amount, or (C) a combination thereof, in each case sufficient,
          after payment of all federal, state and local taxes or other charges
          or assessments in respect thereof payable by the Trustee, 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 (or other qualifying trustee) to pay and discharge, (i) the
          principal of (and premium, if any, on) and each installment of
          principal of (and premium, if any) and interest, if any, on the
          Outstanding Securities of such series or Tranche on the Stated
          Maturity of such principal or installment of principal or interest and
          (ii) any mandatory sinking fund payments or analogous payments
          applicable to the Outstanding Securities of such series or Tranche on
          the day on which such payments are due and payable in accordance with
          the terms of this Indenture and of such Securities.

               (2)  No Default or Event of Default with respect to the
          Securities of such series shall have occurred and be continuing on the
          date of such deposit or shall occur as a result of such deposit, and
          no Default or Event of Default under clause (4) or (5) of Section 501
          hereof shall occur and be continuing, at any time during the period
          ending on the 91st day after the date of such deposit (it being
          understood that this condition shall not be deemed satisfied until the
          expiration of such period).

               (3)  Such deposit, 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.

               (4)  Such Defeasance or Covenant Defeasance shall not cause any
          Securities of such series, or Tranche thereof, then listed on any
          national securities exchange registered under the Exchange Act to be
          delisted.

               (5)  In the case of an election with respect to Section 1302, the
          Company shall have delivered to the Trustee either (A) a ruling
          directed to the Trustee received from the Internal Revenue Service to
          the effect that the Holders of the Outstanding Securities of such
          series, or Tranche thereof, will not recognize income, gain or loss
          for federal income tax purposes as


                                      -69-
<PAGE>

          a result of such Defeasance and will be subject to federal income tax
          on the same amounts, in the same manner and at the same times as would
          have been the case if such Defeasance had not occurred or (B) an
          Opinion of Counsel, based on such ruling or on a change in the
          applicable federal income tax law since the date of this Indenture, in
          either case to the effect that, and based thereon such opinion shall
          confirm that, the Holders of the Outstanding Securities of such
          series, or Tranche thereof, will not recognize income, gain or loss
          for federal income tax purposes as a result of such Defeasance and
          will be subject to federal income tax on the same amounts, in the same
          manner and at the same times as would have been the case if such
          Defeasance had not occurred.

               (6)  In the case of an election with respect to Section 1303, the
          Company shall have delivered to the Trustee an Opinion of Counsel or a
          ruling directed to the Trustee received from the Internal Revenue
          Service to the effect that the Holders of the Outstanding Securities
          of such series or Tranche thereof will not recognize income, gain or
          loss for federal income tax purposes as a result of such Covenant
          Defeasance and will be subject to federal income tax on the same
          amounts, in the same manner and at the same times as would have been
          the case if such Covenant Defeasance had not occurred.

               (7)  Such Defeasance or Covenant Defeasance shall be effected in
          compliance with any additional terms, conditions or limitations which
          may be imposed on the Company in connection therewith pursuant to
          Section 301.

               (8)  The Company shall have delivered to the Trustee an Officer's
          Certificate and an Opinion of Counsel, each stating that all
          conditions precedent provided for relating to either the Defeasance
          under Section 1302 or the Covenant Defeasance under Section 1303 (as
          the case may be) have been complied with.

SECTION 1305.  DEPOSITED MONEY AND GOVERNMENT OBLIGATIONS TO BE HELD IN TRUST.

          Subject to the provisions of the last paragraph of Section 1008, all
money and Government Obligations (including the proceeds thereof) deposited with
the Trustee (or other qualifying trustee--collectively for purposes of this
Section 1305, the "Trustee") pursuant to Section 1304 in respect of the
Outstanding Securities of a particular series, or Tranche, shall be held in
trust and applied by the Trustee, in accordance with the provisions of such
Securities and this Indenture, to the payment,


                                      -70-
<PAGE>

either directly or through any Paying Agent (including the Company acting as its
own Paying Agent) as the Trustee may determine, to the Holders of such
Securities of all sums due and to become due thereon in respect of principal
(and premium, if any) and interest, if any, but such money 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 Government Obligations
deposited pursuant to Section 1304 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 the Outstanding Securities of such series or
Tranche.

          Anything in this Article to the contrary notwithstanding, the Trustee
shall deliver to pay to the Company from time to time upon Company Request any
money or Government Obligations held by it as provided in Section 1304 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 for
the purpose for which such money or Government Obligations were deposited.


                                ARTICLE FOURTEEN

                                  SUBORDINATION

SECTION 1401.  AGREEMENT OF SECURITYHOLDERS THAT SECURITIES SUBORDINATED TO
               EXTENT PROVIDED.

          The Company, for itself, its successors and assigns, covenants and
agrees and each Holder of the Securities by his acceptance thereof likewise
covenants and agrees that the payment of the principal of, premium, if any, and
interest, if any, on each and all of the Securities (other than Securities
discharged pursuant to Article Four or defeased pursuant to Article Thirteen) is
hereby expressly subordinated, to the extent and in the manner hereinafter set
forth, to the prior payment in full, in cash or cash equivalents, of all Senior
Indebtedness.  The provisions of this Article shall constitute a continuing
offer to all persons who, in reliance upon such provisions, become holders of,
or continue to hold, Senior Indebtedness, and such provisions are made for the
benefit of the holders of Senior Indebtedness, and such holders are hereby made
obligees hereunder the same as if their names were written herein as such, and
they and/or each of them may proceed to enforce such provisions.


                                      -71-
<PAGE>

SECTION 1402.  COMPANY NOT TO MAKE PAYMENTS WITH RESPECT TO SECURITIES IN
               CERTAIN CIRCUMSTANCES.

          (a)  No direct or indirect payment by or on behalf of the Company of
principal of or premium, if any, or interest on the Securities (other than
Securities which have been discharged pursuant to Article Four or defeased
pursuant to Article Thirteen), whether pursuant to the terms of the Securities
or upon acceleration or otherwise, shall be made if, at the time of such
payment, there exists (i) a default in the payment of all or any portion of any
Senior Indebtedness and the Trustee has received written notice thereof from the
Company, from holders of Senior Indebtedness or from any trustee, representative
or agent therefor, or (ii) any other default affecting Senior Indebtedness as a
result of which the maturity of such Senior Indebtedness has been accelerated
and the Trustee has received written notice from the Company, from holders of
Senior Indebtedness or from any trustee, representative or agent therefor, and
such default shall not have been cured or waived by or on behalf of the holders
of such Senior Indebtedness.

          (b)  In the event that notwithstanding the provisions of this Section
1402, the Company shall make any payment to the Trustee on account of the
principal of or premium, if any, or interest, if any, on the Securities, or on
account of any sinking fund, or the Holders of the Securities shall receive any
such payment when such payment is prohibited by this Section 1402 and before all
amounts payable on, under or in connection with Senior Indebtedness are paid in
full in cash or cash equivalents, then and in such event, such payment (subject
to the provisions of Sections 1406 and 1407) shall be held by the Trustee or the
Holders of the Securities, as the case may be, in trust for the benefit of, and
shall be paid forthwith over and delivered to, the holders of Senior
Indebtedness (pro rata as to each of such holders on the basis of the respective
amounts of Senior Indebtedness held by them) or their representative or the
trustee under the indenture or other agreement (if any) pursuant to which any
instruments evidencing any Senior Indebtedness may have been issued, as their
respective interests may appear, for application to the payment of all Senior
Indebtedness remaining unpaid to the extent necessary to pay all Senior
Indebtedness in full in accordance with the terms of such Senior Indebtedness,
after giving effect to any concurrent payment or distribution or provision
therefor to or for the holders of Senior Indebtedness.  The Company shall give
prompt written notice to the Trustee of any default under any Senior
Indebtedness or under any agreement pursuant to which Senior Indebtedness may
have been issued.

SECTION 1403.  SECURITIES SUBORDINATED TO PRIOR PAYMENT OF ALL SENIOR
               INDEBTEDNESS ON DISSOLUTION, LIQUIDATION OR REORGANIZATION OF
               COMPANY.

          Upon any payment or distribution of assets or Securities of the
Company, as the case may be, of any kind or


                                      -72-
<PAGE>

character, whether in cash, property or securities, upon any dissolution or
winding up or total or partial liquidation or reorganization of the Company,
whether voluntary or involuntary, or in bankruptcy, insolvency, receivership or
similar proceedings of the Company:

          (a)  the holders of all Senior Indebtedness shall first be entitled to
     receive payment in full in cash or cash equivalents of the principal
     thereof, premium, if any, and interest (including any interest accrued on
     such Senior Indebtedness subsequent to the commencement of a bankruptcy,
     insolvency, receivership or similar proceeding), if any, due thereon before
     the Holders of the Securities are entitled to  receive any payment on
     account of the principal of, premium, if any, or interest, if any, on the
     Securities or any distribution of any assets or securities;

          (b)  any payment or distribution of assets of the Company of any kind
     or character, whether in cash, property or securities, to which the Holders
     of the Securities or the Trustees would be entitled except for the
     provisions of this Article Fourteen, shall be paid by the trustee in
     bankruptcy, receiver, liquidating trustee, custodian, assignee, agent or
     other person making such payment or distribution directly to the holders of
     Senior Indebtedness or their representative or representatives, or to the
     trustee or trustees under any indenture under which any instruments
     evidencing any of such Senior Indebtedness may have been issued, to the
     extent necessary to make payment in full of all Senior Indebtedness
     remaining unpaid, after giving effect to any concurrent  payment or
     distribution or provision therefor to the holders of such Senior
     Indebtedness;

          (c)  in the event that notwithstanding the foregoing provisions of
     this Section 1403, the Company shall make any payment to the Trustee on
     account of the principal of or premium, if any, or interest, if any, on the
     Securities, or on account of any sinking fund, or the Holders of the
     Securities shall receive any such payment when such payment is prohibited
     by this Section 1403 and before all amounts payable on, under or in
     connection with Senior Indebtedness are paid in full in cash or cash
     equivalents, then and in such event, such payment (subject to the
     provisions of Sections 1406 and 1407) shall be held by the Trustee or the
     Holders of the Securities, as the case may be, in trust for the benefit of,
     and shall be paid over and delivered forthwith to the trustee in
     bankruptcy, receiver, liquidating trustee, custodian, assignee, agent or
     other person making payment or distribution of assets of the Company for
     application to the payment of all Senior Indebtedness remaining unpaid to
     the extent necessary to pay all Senior Indebtedness in full in accordance
     with the terms of such Senior Indebtedness, after giving effect to any


                                      -73-
<PAGE>

     concurrent payment or distribution or provision therefor to the holders of
     such Senior Indebtedness.

SECTION 1404.  SECURITYHOLDERS TO BE SUBROGATED TO RIGHT OF HOLDERS OF SENIOR
               INDEBTEDNESS.

          Subject to the payment in full in cash or cash equivalents of all
Senior Indebtedness, the Holders of the Securities shall be subrogated to the
rights of the holders of Senior Indebtedness to receive payments or
distributions of assets of the Company applicable to the Senior Indebtedness
until all amounts owing on the Securities shall be paid in full, and for the
purpose of such subrogation no payments or distributions to the holders of the
Senior Indebtedness by or on behalf of the Company or by or on behalf of the
Holders of the Securities by virtue of this Article which otherwise would have
been made to the Holders of the Securities shall, as between the Company, its
creditors other than holders of the Senior Indebtedness and the Holders of the
Securities, be deemed to be payment by the Company to or on account of the
Senior Indebtedness, it being understood that the provisions of this Article
Fourteen are and are intended solely for the purpose of defining the relative
rights of the Holders of the Securities, on the one hand, and the holders of
the Senior Indebtedness, on the other hand.

SECTION 1405.  OBLIGATION OF THE COMPANY UNCONDITIONAL.

          Nothing contained in this Article Fourteen or elsewhere in this
Indenture or in the Securities is intended to or shall impair as between the
Company and the Holders of the Securities, the obligation of the Company, which
is absolute and unconditional, to pay to the Holders of the Securities the
principal of, premium, if any, and interest, if any, on the Securities as and
when the same shall become due and payable in accordance with their terms, or is
intended to or shall affect the relative rights of the Holders of the Securities
and creditors of the Company other than the holders of the Senior Indebtedness,
nor shall anything herein or therein prevent the Trustee or the Holder of any
Security from exercising all remedies otherwise permitted by applicable law upon
default under this Indenture, subject to the rights, if any, under this Article
Fourteen of the holders of Senior Indebtedness in respect of cash, property, or
securities of the Company received upon the exercise of any such remedy.  Upon
any distribution of assets of the Company referred to in this Article Fourteen,
the Trustee, subject to the provisions of Section 601, and the Holders of the
Securities shall be entitled to rely upon any order or decree made by any court
of competent jurisdiction in which such liquidation, dissolution, winding up, or
reorganization proceedings are pending, or a certificate of the liquidating
trustee or agent or other person making any distribution to the Trustee or to
the Holders of the Securities, for the purpose of ascertaining the persons
entitled to participate in such distribution, the holders of the Senior
Indebtedness and other


                                      -74-
<PAGE>

indebtedness of the Company, the amount thereof or payable thereon, the amount
or amounts paid or distributed thereon and all other facts pertinent thereto or
to this Article Fourteen.

SECTION 1406.  TRUSTEE ENTITLED TO ASSUME PAYMENTS NOT PROHIBITED IN ABSENCE OF
               NOTICE.

          The Trustee shall not at any time be charged with knowledge of the
existence of any facts which would prohibit the making of any payment of monies
to or by the Trustee, unless and until a Responsible Officer of the Trustee
shall have received written notice thereof from the Company or from one or more
holders of Senior Indebtedness or from any trustee therefor; and, prior to the
receipt of any such written notice, the Trustee, subject to the provisions of
Section 601, shall be entitled to assume conclusively that no such facts exist.

SECTION 1407.  APPLICATION BY TRUSTEE OF MONIES DEPOSITED WITH IT.

          Anything in this Indenture to the contrary notwithstanding, any
deposit of monies by the Company with the Trustee or any paying agent (whether
or not in trust) for the payment of the principal of or premium, if any, or
interest, if any, on any Securities shall be subject to the provisions of
Sections 1401, 1402, 1403 and 1404 except that, if prior to the date on which by
the terms of this Indenture any such monies may become payable for any purpose
(including, without limitation, the payment of either the principal of or the
interest or premium, if any, on any Security) a Responsible Officer of the
Trustee shall not have received with respect to such monies the notice provided
for in Section 1406, then, anything herein contained to the contrary
notwithstanding, the Trustee shall have full power and authority to receive such
monies and to apply the same to the purpose for which they were received, and
shall not be affected by any notice to the contrary which may be received by it
on or after such date.

SECTION 1408.  SUBORDINATION RIGHTS NOT IMPAIRED BY ACTS OR OMISSIONS OF COMPANY
               OR HOLDERS OF SENIOR INDEBTEDNESS.

          No right of any present or future holders of any Senior Indebtedness
to enforce subordination as herein provided shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of the Company
or by any act or failure to act, in good faith, by any such holder, or by any
noncompliance by the Company with the terms, provisions and covenants of this
Indenture, regardless of any knowledge thereof which any such holder may have or
be otherwise charged with.


                                      -75-
<PAGE>

SECTION 1409.  SECURITYHOLDERS AUTHORIZE TRUSTEE TO EFFECTUATE SUBORDINATION OF
               SECURITIES.

          Each Holder of the Securities by his acceptance thereof authorizes and
expressly directs the Trustee on his behalf to take such action as may be
necessary or appropriate to effectuate the subordination provided in this
Article Fourteen and appoints the Trustee his attorney-in-fact for such purpose,
including, in the event of any dissolution, winding up, liquidation or
reorganization of the Company (whether in bankruptcy, insolvency or receivership
proceedings or upon an assignment for the benefit of creditors or otherwise)
tending towards liquidation of the business and assets of the Company, the
immediate filing of a claim for the unpaid balance of its or his Securities in
the form required in said proceedings and cause said claim to be approved.

SECTION 1410.  RIGHT OF TRUSTEE TO HOLD SENIOR INDEBTEDNESS.

          The Trustee shall be entitled to all of the rights set forth in this
Article Fourteen in respect of any Senior Indebtedness at any time held by it to
the same extent as any other holder of Senior Indebtedness, and nothing in
Section 613 or elsewhere in this Indenture shall be construed to deprive the
Trustee of any of its rights as such Holder.

SECTION 1411.  ARTICLE FOURTEEN NOT TO PREVENT EVENTS OF DEFAULT.

          The failure to make a payment on account of principal, interest or
sinking fund by reason of any provision in this Article Fourteen shall not be
construed as preventing the occurrence of an Event of Default under Section 501.


                                 ARTICLE FIFTEEN

                                  MISCELLANEOUS

SECTION 1501.  MISCELLANEOUS.

          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.


                                      -76-
<PAGE>

          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.


                         PUBLIC SERVICE COMPANY
                            OF COLORADO

                         By:   /s/ Brian P. Jackson
                            ------------------------------------------
                            Name:  Brian P. Jackson
                            Title: Senior Vice President
                                   and Chief Financial Officer



Attest:

     /s/ Teresa S. Madden
- ----------------------------
Name:  Teresa S. Madden
Title: Secretary


                                   THE BANK OF NEW YORK,
                                           as Trustee


                                        By:  /s/ Walter N. Gitlin
                                           ---------------------------
                                           Name: Walter N. Gitlin
                                           Title: Vice President


                                      -77-

<PAGE>




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


                          FIRST SUPPLEMENTAL INDENTURE

                            Dated as of May 11, 1998

                                     between

                       PUBLIC SERVICE COMPANY OF COLORADO

                                    AS ISSUER

                                       and

                              THE BANK OF NEW YORK

                                   AS TRUSTEE


                      =====================================
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page


I    DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.1. Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . . 2

II   GENERAL TERMS AND CONDITIONS OF THE DEBENTURES. . . . . . . . . . . . . . 3
     2.1. Designation and Principal Amount . . . . . . . . . . . . . . . . . . 3
     2.2. Maturity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.3. Form and Payment . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.4. Global Debenture . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     2.5. Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     2.6. Redemption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     2.7  No Sinking Fund. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     2.8  Depository . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     2.9  Appointment of Agents. . . . . . . . . . . . . . . . . . . . . . . . 6

III  REDEMPTION OF THE DEBENTURES. . . . . . . . . . . . . . . . . . . . . . . 7
     3.1. Special Event Redemption . . . . . . . . . . . . . . . . . . . . . . 7
     3.2. Optional Redemption by Company . . . . . . . . . . . . . . . . . . . 8

IV   EXTENSION OF INTEREST PAYMENT PERIOD. . . . . . . . . . . . . . . . . . . 9
     4.1. Extension of Interest Payment Period . . . . . . . . . . . . . . . . 9
     4.2. Notice of Extension. . . . . . . . . . . . . . . . . . . . . . . . . 9
     4.3. Limitation of Transactions . . . . . . . . . . . . . . . . . . . . .10

V    EXPENSES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
     5.1. Payment of Expenses. . . . . . . . . . . . . . . . . . . . . . . . .11
     5.2. Payment Upon Resignation or Removal. . . . . . . . . . . . . . . . .11

VI   SUBORDINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
     6.1. Subordination. . . . . . . . . . . . . . . . . . . . . . . . . . . .12

VII  COVENANT TO LIST ON EXCHANGE. . . . . . . . . . . . . . . . . . . . . . .12
     7.1. Listing on an Exchange . . . . . . . . . . . . . . . . . . . . . . .12

VIII FORM OF DEBENTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
     8.1. Form of Debenture. . . . . . . . . . . . . . . . . . . . . . . . . .12

IX   ORIGINAL ISSUE OF DEBENTURES. . . . . . . . . . . . . . . . . . . . . . .21
     9.1. Original Issue of Debentures . . . . . . . . . . . . . . . . . . . .21


                                        i
<PAGE>

X    MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
     10.1.     Ratification of Indenture . . . . . . . . . . . . . . . . . . .21
     10.2.     Trustee Not Responsible for Recitals. . . . . . . . . . . . . .21
     10.3.     Governing Law . . . . . . . . . . . . . . . . . . . . . . . . .21
     10.4.     Separability. . . . . . . . . . . . . . . . . . . . . . . . . .21
     10.5.     Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . .22


                                       ii
<PAGE>

          FIRST SUPPLEMENTAL INDENTURE, dated as of May 11, 1998 (the "First
Supplemental Indenture"), between Public Service Company of Colorado, a
corporation duly organized and existing under the laws of the State of Colorado,
having its principal office at 1225 17th Street, Denver, Colorado 80202 (the
"Company"), and The Bank of New York, a New York banking corporation, having its
corporate trust office at 101 Barclay Street, Floor 21 West, New York, New York
10286, as trustee (the "Trustee") under the Indenture dated as of May 1, 1998
(the "Indenture"), between the Company and the Trustee.

          WHEREAS, the Company executed and delivered the Indenture to the
Trustee to provide for the future issuance of the Company's unsecured
debentures, notes or other evidence of indebtedness (the "Securities"), to be
issued from time to time in one or more series as might be determined by the
Company under the Indenture;

          WHEREAS, pursuant to the terms of the Indenture, the Company desires
to provide for the establishment of a new series of its Securities to be known
as its 7.60% Deferrable Interest Subordinated Debentures due 2038  (the
"Debentures"), the form and substance of such Debentures and the terms,
provisions and conditions thereof to be set forth as provided in the Indenture
and this First Supplemental Indenture;

          WHEREAS, PSCO Capital Trust I, a Delaware statutory business trust
(the "Trust"), intends to offer to the public $194,000,000 million aggregate
liquidation amount of its 7.60% Trust Originated Preferred Securities (the
"Preferred Securities"), representing preferred undivided beneficial interests
in the assets of the Trust, and proposes to invest the proceeds from such
offering, together with the proceeds of the issuance and sale by the Trust to
the Company of $6,000,000 million aggregate liquidation amount of its 7.60%
Common Securities, in $200,000,000 million aggregate principal amount of the
Debentures; and

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

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



<PAGE>

                                    ARTICLE I
                                   DEFINITIONS

SECTION 1.1.   DEFINITION OF TERMS.

          Unless the context otherwise requires:

          (a)  a term defined in the Indenture has the same meaning when used in
this First Supplemental Indenture;

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

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

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

          (e)  the following terms have the meanings given to them in the
Declaration:  (i) Administrative Trustee; (ii) Business Day; (iii) Clearing
Agency; (iv) Delaware Trustee; (v) Guarantee; (vi) Preferred Securities
Certificate; (vii) Pricing Agreement; (viii) Property Trustee; (ix) Trust
Securities; and (x) Underwriting Agreement; and

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

          "Additional Interest" shall have the meaning set forth in
Section 2.5(c).

          "Change in 1940 Act Law" shall have the meaning set forth in
Section 3.1.

          "Compounded Interest" shall have the meaning set forth in Section 4.1.

          "Coupon Rate" shall have the meaning set forth in Section 2.5(a).

          "Declaration" means the Amended and Restated Declaration of Trust of
PSCO Capital Trust I, a Delaware statutory business trust, dated as of May 11,
1998.

          "Deferred Interest" shall have the meaning set forth in Section 4.1.

          "Dissolution Event" means that the Trust is to be dissolved in
accordance with the Declaration, and the Debentures held by the Property Trustee
are to be distributed to the holders of the Trust Securities issued by the Trust
pro rata in accordance with the Declaration.

          "Extended Interest Payment Period" shall have the meaning set forth in
Section 4.1.

          "Global Debenture" shall have the meaning set forth in Section 2.4(a).


                                        2
<PAGE>

          "Interest Payment Date" shall have the meaning set forth in
Section 2.5(a).

          "Investment Company Event" shall have the meaning set forth in
Section 3.1.

          "Maturity Date" means the date on which the Debentures mature and on
which the principal shall be due and payable together with all accrued and
unpaid interest thereon including Compounded Interest and Additional Interest,
if any.

          "Ministerial Action" shall have the meaning set forth in Section 3.1.

          "90 Day Period" shall have the meaning set forth in Section 3.1.

          "Non Book-Entry Preferred Securities" shall have the meaning set forth
in Section 2.4(a).

          "Optional Redemption Price" shall have the meaning set forth in
Section 3.2(a).

          "Redemption Price" shall have the meaning set forth in Section 3.1.

          "Special Event" shall have the meaning set forth in Section 3.1.

          "Tax Event" shall have the meaning set forth in Section 3.1.


                                   ARTICLE II
                 GENERAL TERMS AND CONDITIONS OF THE DEBENTURES

SECTION 2.1.   DESIGNATION AND PRINCIPAL AMOUNT.

          There is hereby authorized a series of Securities designated the
"7.60% Deferrable Interest Subordinated Debentures due 2038", limited in
aggregate principal amount to $200,000,000 million, to be substantially in the
form set forth in Article VIII hereof, subject to changes in the form thereof
made by the Company and acceptable to the Trustee.

SECTION 2.2.   MATURITY.

          The Maturity Date of the Debentures is June 30, 2038.

SECTION 2.3.   FORM AND PAYMENT.

          Except as provided in Section 2.4, the Debentures shall be issued in
fully registered certificated form without interest coupons in denominations of
$1,000 or integral multiples of $1,000.  The Place of Payment for the Debentures
issued in certificated form where the transfer of such Debentures will be
registrable and where such Debentures will be exchangeable for


                                        3
<PAGE>

Debentures bearing identical terms and provisions shall be the Corporate Trust
Office of the Trustee; provided, however, that payment of interest may be made
at the option of the Company by check mailed to the Holder at such address as
shall appear in the Security Register.  Notwithstanding the foregoing, so long
as the Holder of any Debentures is the Property Trustee, the payment of the
principal of and interest (including Compounded Interest and Additional
Interest, if any) on such Debentures held by the Property Trustee will be made
at such place and to such account as may be designated to the Company in writing
by the Property Trustee.

SECTION 2.4.   GLOBAL DEBENTURE.

          (a)  In connection with a Dissolution Event,

               (i) the Debentures in certificated form may be presented to the
     Trustee by the Property Trustee in exchange for a global Debenture in an
     aggregate principal amount equal to the aggregate principal amount of all
     outstanding Debentures (a "Global Debenture"), to be registered in the name
     of the Depository, or its nominee, and delivered by the Trustee to the
     Depository for crediting to the accounts of its participants pursuant to
     the instructions of the Administrative Trustee.  The Company upon any such
     presentation shall execute a Global Debenture in such aggregate principal
     amount and deliver the same to the Trustee for authentication and delivery
     in accordance with the Indenture and this First Supplemental Indenture.
     Payments on the Debentures issued as a Global Debenture will be made to the
     Depository; and

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


                                        4
<PAGE>

          (b)  Unless and until it is exchanged for the Debentures in registered
form, a Global Debenture may be transferred, in whole but not in part, only to
another nominee of the Depository, or to a successor Depository selected or
approved by the Company or to a nominee of such successor Depository.

          (c)  If at any time the Depository notifies the Company that it is
unwilling or unable to continue as Depository or if at any time the Depository
for such series shall no longer be registered or in good standing under the
Securities Exchange Act of 1934, as amended, or other applicable statute or
regulation, and a successor Depository for such series is not appointed by the
Company within 90 days after the Company receives such notice or becomes aware
of such condition, as the case may be, the Company will execute, and, subject to
Article Three of the Indenture, the Trustee, upon written notice from the
Company, will authenticate and deliver the Debentures in definitive registered
form without coupons, in authorized denominations, and in an aggregate principal
amount equal to the principal amount of the Global Debenture in exchange for
such Global Debenture.  In addition, the Company may at any time determine that
the Debentures shall no longer be represented by the Global Debenture.  In such
event the Company will execute, and subject to Section 303 of the Indenture, the
Trustee, upon receipt of an Officers' Certificate evidencing such determination
by the Company, will authenticate and deliver the Debentures in definitive
registered form without coupons, in authorized denominations, and in an
aggregate principal amount equal to the principal amount of the Global Debenture
in exchange for such Global Debenture.  Upon the exchange of the Global
Debenture for such Debentures in definitive registered form without coupons, in
authorized denominations, the Global Debenture shall be cancelled by the
Trustee.  Such Debentures in definitive registered form issued in exchange for
the Global Debenture shall be registered in such names and in such authorized
denominations as the Depository, pursuant to instructions from its direct or
indirect participants or otherwise, shall instruct the Trustee.  The Trustee
shall deliver such Debentures to the Depository for delivery to the Persons in
whose names such Debentures are so registered.

SECTION 2.5.   INTEREST.

          (a)  Each Debenture will bear interest at the rate of 7.60% per annum
(the "Coupon Rate") from the original date of issuance until the principal
thereof becomes due and payable, and on any overdue principal and (to the extent
that payment of such interest is enforceable under applicable law) on any
overdue installment of interest at the Coupon Rate, compounded quarterly,
payable (subject to the provisions of Article IV) quarterly in arrears on March
31, June 30, September 30 and December 31 of each year (each, an "Interest
Payment Date," commencing on June 30, 1998), to the Person in whose name such
Debenture or any predecessor Debenture is registered, at the close of business
on the regular record date for such interest installment, which, in respect of
(i) Debentures of which the Property Trustee is the Holder and the Preferred
Securities are in book-entry only form or (ii) a Global Debenture, shall be the
close of business on the Business Day next preceding that Interest Payment Date.
Notwithstanding the foregoing sentence, if (i) the Debentures are held by the
Property Trustee and the Preferred Securities are no longer in book-entry only
form or (ii) the Debentures are not represented by a Global Debenture, the
Company may select a regular record date for such interest


                                        5
<PAGE>

installment which shall be any date at least one Business Day but less than
sixty Business Days before an Interest Payment Date.

          (b)  The amount of interest payable for any period will be computed on
the basis of a 360-day year of twelve 30-day months.  Except as provided in the
following sentence, the amount of interest payable for any period shorter than a
full quarterly period for which interest is computed, will be computed on the
basis of the actual number of days elapsed in such a 90-day period.  In the
event that any date on which interest is payable on the Debentures is not a
Business Day, then payment of interest payable on such date will be made on the
next succeeding day which is a Business Day (and without any interest or other
payment in respect of any such delay), except that, if such Business Day is in
the next succeeding calendar year, such payment shall be made on the immediately
preceding Business Day, in each case with the same force and effect as if made
on such date.

          (c)  If, at any time while the Property Trustee is the Holder of any
Debentures, the Trust or the Property Trustee is required to pay any taxes,
duties, assessments or governmental charges of whatever nature (other than
withholding taxes) imposed by the United States, or any other taxing authority,
then, in any case, the Company will pay as additional interest ("Additional
Interest") on the Debentures held by the Property Trustee, such additional
amounts as shall be required so that the net amounts received and retained by
the Trust and the Property Trustee after paying such taxes, duties, assessments
or other governmental charges will be equal to the amounts the Trust and the
Property Trustee would have received had no such taxes, duties, assessments or
other government charges been imposed.

SECTION 2.6.   REDEMPTION.

          The Debentures are not subject to redemption at the option of the
Holder and are subject to redemption solely at the option of the Company or
otherwise as provided in Article III hereof.

SECTION 2.7    NO SINKING FUND.

          The Debentures shall not be entitled to the benefit of any sinking
fund or analogous provision.

SECTION 2.8    DEPOSITORY.

          The Depository Trust Company (or its nominee) shall act as the initial
Depository for any Global Debenture which may be issued pursuant to this First
Supplemental Indenture.

SECTION 2.9    APPOINTMENT OF AGENTS.

          The Company hereby appoints, or confirms the appointment of, The Bank
of New York as the initial Trustee, Securities Registrar and Paying Agent with
respect to the Debentures,


                                        6
<PAGE>

subject to the provisions of the Indenture with respect to resignation, removal
and succession, and subject, further, to the right of the Company to appoint
additional agents (including Paying Agents).


                                   ARTICLE III
                          REDEMPTION OF THE DEBENTURES

SECTION 3.1.   SPECIAL EVENT REDEMPTION.

          If a Special Event (as defined below) has occurred and is continuing
then, notwithstanding Section 3.2(a) but subject to Section 3.2(b), the Company
shall have the right upon not less than 30 days nor more than 60 days notice to
the Holders of the Debentures to redeem the Debentures, in whole but not in
part, for cash within 90 days following the occurrence of such Special Event
(the "90 Day Period") at a redemption price equal to 100% of the principal
amount to be redeemed plus any accrued and unpaid interest thereon, including
Compounded Interest and Additional Interest, if any, to the date of such
redemption (the "Redemption Price"); provided, however, that in the case of an
occurrence of a Tax Event, if at the time there is available to the Company the
opportunity to eliminate, within the 90 Day Period, the Tax Event by taking some
ministerial action ("Ministerial Action"), such as filing a form or making an
election, or pursuing some other similar reasonable measure which has no adverse
effect on the Company, the Trust or the Holders of the Trust Securities issued
by the Trust, the Company shall pursue such Ministerial Action in lieu of
redemption, and, provided, further, that the Company shall have no right to
redeem the Debentures while the Trust is pursuing any Ministerial Action
pursuant to its obligations under the Declaration.  The Redemption Price shall
be paid prior to 12:00 noon, New York time, on the date of such redemption or at
such earlier time as the Company determines, provided that the Company shall
deposit with the Trustee an amount sufficient to pay the Redemption Price by
10:00 a.m., New York time, on the date such Redemption Price is to be paid.

          A "Special Event" shall mean either a Tax Event or an Investment
Company Event.  "Tax Event" shall mean that the Company shall have received an
opinion of counsel (which may be regular counsel to the Company or an Affiliate,
but not an employee thereof, which must be acceptable to the Property Trustee of
the Trust) experienced in such matters to the effect that, as a result of any
amendment to, or change (including any announced prospective change) in, the
laws (or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein affecting taxation, or as a
result of any official administrative pronouncement or judicial decision
interpreting or applying such laws or regulations, which amendment or change is
effective or such interpretation or pronouncement is announced on or after the
date of original issuance of Preferred Securities, there is more than an
insubstantial risk that (i) the Trust is subject to United States Federal income
tax with respect to interest received on the Debentures, (ii) interest payable
by the Company to the Trust on the Debentures will not be deductible for United
States Federal income tax purposes, or (iii) the Trust is subject to more than a
de minimis amount of other taxes, duties, assessments or other governmental
charges.


                                        7
<PAGE>

"Investment Company Event" shall mean the occurrence of a change in law or
regulation or a change in interpretation or application of law or regulation by
any legislative body, court, governmental agency or regulatory authority (a
"Change in 1940 Act Law") to the effect that the Trust is or will be considered
an "Investment Company" that is required to be registered under the Investment
Company Act of 1940, as amended, which Change in 1940 Act Law becomes effective
on or after the date of original issuance of the Preferred Securities.

SECTION 3.2.   OPTIONAL REDEMPTION BY COMPANY.

          (a)  Subject to the provisions of Section 3.2(b) and to the provisions
of Article Eleven of the Indenture, except as otherwise may be specified in this
First Supplemental Indenture, the Company shall have the right to redeem the
Debentures, in whole or in part, from time to time, on or after May 11, 2003,
upon not less than 30 days nor more than 60 days notice to the Holder of the
Debentures at a redemption price equal to 100% of the principal amount to be
redeemed plus any accrued and unpaid interest thereon, including Compounded
Interest and Additional Interest, if any, to the date of such redemption (the
"Optional Redemption Price").

          If the Debentures are only partially redeemed pursuant to this
Section 3.2, the Debentures will be redeemed pro rata or by lot or by any other
method utilized by the Trustee; provided, that if at the time of redemption the
Debentures are registered as a Global Debenture, the Depository shall determine,
in accordance with its procedures, the principal amount of such Debentures held
by each Debenture Holder to be redeemed.  The Optional Redemption Price shall be
paid prior to 12:00 noon, New York time, on the date of such redemption or at
such earlier time as the Company determines, provided that the Company shall
deposit with the Trustee an amount sufficient to pay the Optional Redemption
Price by 10:00 a.m., New York time, on the date such Optional Redemption Price
is to be paid.

          (b)  If a partial redemption of the Debentures would result in the
delisting of the Preferred Securities issued by the Trust from any national
securities exchange or other organization on which the Preferred Securities are
then listed, the Company shall not be permitted to effect such partial
redemption and may only redeem the Debentures in whole.


                                   ARTICLE IV
                      EXTENSION OF INTEREST PAYMENT PERIOD

SECTION 4.1.   EXTENSION OF INTEREST PAYMENT PERIOD.

          The Company shall have the right, at any time and from time to time
during the term of the Debentures, so long as no Event of Default with respect
to the Debentures has occurred and is continuing, to defer payments of interest
by extending the interest payment period of such Debentures for a period not
exceeding 20 consecutive quarters (the "Extended Interest Payment Period"),
during which Extended Interest Payment Period no interest shall be due and
payable; provided that no Extended Interest Payment Period may extend beyond the
Maturity


                                        8
<PAGE>

Date. To the extent permitted by applicable law, interest, the payment of which
has been deferred because of the extension of the interest payment period
pursuant to this Section 4.1, will bear interest thereon at the Coupon Rate
compounded quarterly for each quarter of the Extended Interest Payment Period
("Compounded Interest").  At the end of the Extended Interest Payment Period,
the Company shall pay all interest accrued and unpaid on the Debentures,
including any Additional Interest and Compounded Interest (together, "Deferred
Interest") that shall be payable to the Holders of the Debentures in whose names
the Debentures are registered in the Security Register on the first record date
after the end of the Extended Interest Payment Period.  Before the termination
of any Extended Interest Payment Period, the Company may further extend such
period, provided that such period together with all such further extensions
thereof shall not exceed 20 consecutive quarters or extend beyond the Maturity
Date.  Upon the termination of any Extended Interest Payment Period and upon the
payment of all Deferred Interest then due, the Company may commence a new
Extended Interest Payment Period, subject to the foregoing requirements.  No
interest shall be due and payable during an Extended Interest Payment Period,
except (i) at the end thereof and (ii) upon a redemption of the Debentures
during an Extended Interest Payment Period, but the Company may prepay at any
time all or any portion of the interest accrued during an Extended Interest
Payment Period.

SECTION 4.2.   NOTICE OF EXTENSION.

          (a)  If the Property Trustee is the only registered Holder of the
Debentures at the time the Company selects an Extended Interest Payment Period,
the Company shall give written notice to the Administrative Trustee, the
Property Trustee and the Trustee of its selection of such Extended Interest
Payment Period one Business Day before the earlier of (i) the next succeeding
date on which Distributions on the Preferred Securities issued by the Trust are
payable, or (ii) the date the Trust is required to give notice of the record
date, or the date such Distributions are payable, to the New York Stock Exchange
or other applicable self-regulatory organization or to holders of the Preferred
Securities issued by the Trust, but in any event at least one Business Day
before such record date.

          (b)  If the Property Trustee is not the only Holder of the Debentures
at the time the Company selects an Extended Interest Payment Period, the Company
shall give the Holders of the Debentures and the Trustee written notice of its
selection of such Extended Interest Payment Period at least ten Business Days
before the earlier of (i) the next succeeding Interest Payment Date, or (ii) the
date the Company is required to give notice of the record or payment date of
such interest payment to the New York Stock Exchange or other applicable
self-regulatory organization or to Holders of the Debentures.

          (c)  The quarter in which any notice is given pursuant to paragraphs
(a) or (b) of this Section 4.2 shall be counted as one of the 20 quarters
permitted in the maximum Extended Interest Payment Period permitted under
Section 4.1.


SECTION 4.3.   LIMITATION OF TRANSACTIONS.


                                        9
<PAGE>

          If (i) the Company shall exercise its right to defer payment of
interest as provided in Section 4.1, (ii) there shall have occurred any Event of
Default, as defined in the Indenture, or (iii) the Company shall be in default
with respect to its payment obligations under the Guarantee, then (a) the
Company shall not declare or pay any dividend on, make any distributions with
respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock (other than (i) as a result of a
reclassification of its capital stock or the exchange or conversion of one class
or series of its capital stock for another class or series of its capital stock,
(ii) any declaration of a dividend in connection with the implementation of a
shareholder rights plan, or the issuance of stock under any such plan in the
future, or the redemption or repurchase of any such rights pursuant thereto,
(iii) purchases of its common stock related to the issuance of such stock under
any of the Company's benefit plans for its directors, officers or employees,
(iv) obligations under any dividend reinvestment plan or stock purchase plan of
the Company, or (v) the purchase of fractional interests in shares of its
capital stock pursuant to the conversion or exchange provisions of such capital
stock or security being converted or exchanged) or make any guarantee payment
with respect thereto, (b) the Company shall not make any payment of interest,
principal or premium, if any, on or repay, repurchase or redeem any debt
securities issued by the Company which rank PARI PASSU with or junior to the
Debentures and (c) the Company shall not make any guarantee payments with
respect to the foregoing (other than pursuant to the Guarantee and any similar
guarantee issued by the Company on behalf of holders of preferred securities
issued by an issuer holding Securities issued under the Indenture).


                                    ARTICLE V
                                    EXPENSES

SECTION 5.1.   PAYMENT OF EXPENSES.

          In connection with the offering, sale and issuance of the Debentures
to the Property Trustee and in connection with the sale of the Trust Securities
by the Trust, the Company, in its capacity as borrower with respect to the
Debentures, shall:

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

          (b)  pay all costs and expenses of the Trust (including, but not
limited to, costs and expenses relating to the organization of the Trust, the
offering, sale and issuance of the Trust Securities (including commissions to
the underwriters in connection therewith), the fees and expenses of the Property
Trustee and the Delaware Trustee, the costs and expenses relating to the
operation of the Trust, including without limitation, costs and expenses of
accountants, attorneys, statistical or bookkeeping services, expenses for
printing and engraving and computing or accounting equipment, paying agent(s),
registrar(s), transfer agent(s), duplicating, travel and


                                       10
<PAGE>

telephone and other telecommunications expenses and costs and expenses incurred
in connection with the acquisition, financing, and disposition of Trust assets);


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

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

SECTION 5.2.   PAYMENT UPON RESIGNATION OR REMOVAL.

     Upon termination of this First Supplemental Indenture or the Indenture or
the removal or resignation of the Trustee pursuant to this Section 5.2, the
Company shall pay to the Trustee all amounts accrued to the date of such
termination, removal or resignation.  Upon termination of the Declaration or the
removal or resignation of the Delaware Trustee or the Property Trustee, as the
case may be, pursuant to Section 7.10 of the Declaration, the Company shall pay
to the Delaware Trustee or the Property Trustee, as the case may be, all amounts
accrued to the date of such termination, removal or resignation.


                                   ARTICLE VI
                                  SUBORDINATION

SECTION 6.1.   SUBORDINATION.

          The indebtedness evidenced by the Debenture shall be, to the extent
and in the manner set forth in the Indenture, subordinate and junior in right of
payment to the prior payment in full of all Senior Indebtedness (as defined in
the Indenture) with respect to the Debentures, and the Debentures shall rank
PARI PASSU in right of payment with each other series of Securities issued under
the Indenture, with the exception of any series of Securities which by its terms
provides otherwise.


                                   ARTICLE VII
                          COVENANT TO LIST ON EXCHANGE

SECTION 7.1.   LISTING ON AN EXCHANGE.

          If the Debentures are to be distributed to the holders of Preferred
Securities as described in Section 2.4(a), the Company will, if the Debentures
are not already so listed, use its best efforts to list such Debentures on the
New York Stock Exchange, Inc. or on such other exchange as the Preferred
Securities are then listed.


                                       11
<PAGE>

                                  ARTICLE VIII
                                FORM OF DEBENTURE

SECTION 8.1.   FORM OF DEBENTURE.

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

                               (FORM OF DEBENTURE)

          [IF THE DEBENTURE IS TO BE A GLOBAL DEBENTURE, INSERT -- THIS
DEBENTURE IS A GLOBAL DEBENTURE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER
REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE OF A
DEPOSITORY. THIS DEBENTURE IS EXCHANGEABLE FOR DEBENTURES REGISTERED IN THE NAME
OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED
CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER OF THIS DEBENTURE
(OTHER THAN A TRANSFER OF THIS DEBENTURE AS A WHOLE BY THE DEPOSITORY TO A
NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR
ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY) MAY BE
REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

          UNLESS THIS DEBENTURE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) TO THE ISSUER
OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
DEBENTURE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND
ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE  OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.]

No.
    --------------------
$
 -----------------------
CUSIP No.
          --------------

                                       12
<PAGE>

                       PUBLIC SERVICE COMPANY OF COLORADO

                7.60% DEFERRABLE INTEREST SUBORDINATED DEBENTURE
                                    DUE 2038

          PUBLIC SERVICE COMPANY OF COLORADO, a Colorado corporation (the
"Company", which term includes any successor corporation under the Indenture
hereinafter referred to), for value received, hereby promises to pay to PSCO
Capital Trust I or registered assigns, the principal sum of Two Hundred Million
Dollars ($200,000,000) on June 30, 2038,  and to pay interest on said principal
sum from May 11, 1998, or from the most recent interest payment date (each such
date, an "Interest Payment Date") to which interest has been paid or duly
provided for, quarterly (subject to deferral as set forth herein) in arrears on
March 31, June 30, September 30 and December 31 of each year commencing June 30,
1998, at the rate of 7.60% per annum until the principal hereof shall have
become due and payable, and on any overdue principal and premium, if any, and
(without duplication and to the extent that payment of such interest is
enforceable under applicable law) on any overdue installment of interest at the
same rate per annum compounded quarterly.  The amount of interest payable on any
Interest Payment Date shall be computed on the basis of a 360-day year of twelve
30-day months.  In the event that any date on which interest is payable on this
Debenture is not a Business Day, then payment of interest payable on such date
will be made on the next succeeding day that is a Business Day (and without any
interest or other payment in respect of any such delay), except that, if such
Business Day is in the next succeeding calendar year, such payment shall be made
on the immediately preceding Business Day, in each case with the same force and
effect as if made on such date.  The interest installment so payable, and
punctually paid or duly provided for, on any Interest Payment Date will, as
provided in the Indenture, be paid to the person in whose name this Debenture
(or one or more Predecessor Securities, as defined in said Indenture) is
registered at the close of business on the regular record date for such interest
installment, which shall be the close of business on the Business Day next
preceding such Interest Payment Date.   [IF PURSUANT TO THE PROVISIONS OF THE
INDENTURE THE DEBENTURES ARE NO LONGER REPRESENTED BY A GLOBAL DEBENTURE --
which shall be the close of business on the day next preceding such Interest
Payment Date.]  Any such interest installment not punctually paid or duly
provided for shall forthwith cease to be payable to the registered Holders on
such regular record date and may be paid to the Person in whose name this
Debenture (or one or more Predecessor Securities) is registered at the close of
business on a special record date to be fixed by the Trustee for the payment of
such defaulted interest, notice whereof shall be given to the registered Holders
of this series of Debentures not less than 10 days prior to such special record
date, or may be paid at any time in any other lawful manner not inconsistent
with the requirements of any securities exchange on which the Debentures may be
listed, and upon such notice as may be required by such exchange, all as more
fully provided in the Indenture.  The principal of (and premium, if any) and the
interest on this Debenture shall be payable at the office or agency of the
Company maintained for that purpose in any coin or currency of the United States
of America that at the time of payment is legal tender for payment of public and
private debts; provided, however, that payment of interest may be made at the
option of the Company by check mailed to the registered Holder at such address
as shall appear in the Security Register. Notwithstanding the


                                       13
<PAGE>

foregoing, so long as the Holder of this Debenture is the Property Trustee, the
payment of the principal of (and premium, if any) and interest on this Debenture
will be made at such place and to such account as may be designated by the
Property Trustee.

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

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



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


Dated
      --------------------

                              PUBLIC SERVICE COMPANY OF COLORADO


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


Attest:


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


                                       14
<PAGE>

                     (FORM OF CERTIFICATE OF AUTHENTICATION)

                          CERTIFICATE OF AUTHENTICATION

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

Dated
      -------------------

                              THE BANK OF NEW YORK, as Trustee


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



          This Debenture is one of a duly authorized series of Securities of the
Company (herein sometimes referred to as the "Securities"), specified in the
Indenture, all issued or to be issued in one or more series under and pursuant
to an Indenture dated as of May 1, 1998, duly executed and delivered between the
Company and The Bank of New York, as Trustee (the "Trustee"),  as supplemented
by the First Supplemented Indenture dated as of May 11, 1998, between the
Company and the Trustee (the Indenture as so supplemented, the "Indenture"), to
which Indenture and all indentures supplemental thereto reference is hereby made
for a description of the rights, limitations of rights, obligations, duties and
immunities thereunder of the Trustee, the Company and the Holders of the
Securities.  By the terms of the Indenture, the Securities are issuable in
series that may vary as to amount, date of maturity, rate of interest and in
other respects as provided in the Indenture.  This series of Securities is
limited in aggregate principal amount as specified in said First Supplemental
Indenture.

          Except as provided in the next paragraph, the Debentures may not be
redeemed by the Company prior to May 11, 2003.  The Company shall have the right
to redeem this Debenture at the option of the Company, without premium or
penalty, in whole or in part at any time and from time to time on or after May
11, 2003 (an "Optional Redemption"), at the Optional Redemption Price (as
defined in the Indenture).  Any redemption pursuant to this paragraph will be
made upon not less than 30 nor more than 60 days' notice, at the Optional
Redemption Price.

          If a Special Event (as defined below) has occurred and is continuing
then the Company shall have the right upon not less than 30 days nor more than
60 days notice to the Holders of the Debentures to redeem the Debentures, in
whole but not in part, for cash within 90 days following the occurrence of such
Special Event (the "90 Day Period") at a redemption price equal to 100% of the
principal amount to be redeemed plus any accrued and unpaid interest thereon,
including Compounded Interest and Additional Interest, if any, to the date of
such redemption (the "Redemption Price"); provided, however, that in the case of
a Tax Event, if at


                                       15
<PAGE>

the time there is available to the Company the opportunity to eliminate, within
the 90 Day Period, the Tax Event by taking some ministerial action ("Ministerial
Action"), such as filing a form or making an election, or pursuing some other
similar reasonable measure which has no adverse effect on the Company, the Trust
or the Holders of the Trust Securities issued by the Trust, the Company shall
pursue such Ministerial Action in lieu of redemption, and, provided, further,
that the Company shall have no right to redeem the Debentures while the Trust is
pursuing any Ministerial Action pursuant to its obligations under the
Declaration.  The Redemption Price shall be paid prior to 12:00 noon, New York
time, on the date of such redemption or such earlier time as the Company
determines, provided that the Company shall deposit with the Trustee an amount
sufficient to pay the Redemption Price by 10:00 a.m., New York time, on the date
such Redemption Price is to be paid.

          A "Special Event" shall mean either a Tax Event or an Investment
Company Event. "Tax Event" shall mean that the Company shall have received an
opinion of counsel (which may be regular counsel to the Company or an Affiliate,
but not an employee thereof, which must be acceptable to the Property Trustee of
the Trust) experienced in such matters to the effect that, as a result of any
amendment to, or change (including any announced prospective change) in, the
laws (or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein affecting taxation, or as a
result of any official administrative pronouncement or judicial decision
interpreting or applying such laws or regulations, which amendment or change is
effective or such interpretation or pronouncement is announced on or after the
date of original issuance of Preferred Securities, there is more than an
insubstantial risk that (i) the Trust is subject to United States Federal income
tax with respect to interest received on the Debentures, (ii) interest payable
by the Company to the Trust on the Debentures will not be deductible for United
States Federal income tax purposes, or (iii) the Trust is subject to more than a
de minimis amount of other taxes, duties, assessments or other governmental
charges.  "Investment Company Event" shall mean the occurrence of a change in
law or regulation or a change in interpretation or application of law or
regulation by any legislative body, court, governmental agency or regulatory
authority (a "Change in 1940 Act Law") to the effect that the Trust is or will
be considered an "Investment Company" that is required to be registered under
the Investment Company Act of 1940, as amended, which Change in 1940 Act Law
becomes effective  on or after the date of original issuance of the Preferred
Securities.

          Any redemption pursuant to the occurrence of a Special Event will be
made upon not less than 30 days nor more than 60 days notice, at the Redemption
Price.  If the Debentures are only partially redeemed by the Company pursuant to
an Optional Redemption, the Debentures will be redeemed pro rata or by lot or by
any other method utilized by the Trustee; provided that if, at the time of
redemption, the Debentures are registered as a Global Debenture, the Depository
shall determine the principal amount of such Debentures held by each Debenture
Holder to be redeemed in accordance with its procedures.

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


                                       16
<PAGE>

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

          The Indenture contains provisions permitting the Company and the
Trustee, with the consent of the Holders of not less than a majority in
aggregate principal amount of the Debentures of each series affected at the time
outstanding, as defined in the Indenture, to execute supplemental indentures for
the purpose of adding any provisions to or changing in any manner or eliminating
any of the provisions of the Indenture or of any supplemental indenture or of
modifying in any manner the rights of the Holders of the Debentures; provided,
however, that no such supplemental indenture shall, among other things, (i)
reduce the principal amount thereof, or reduce the rate or extend the time of
payment of interest thereon, or reduce any premium payable upon the redemption
thereof, without the consent of the Holder of each Debenture so affected, or
(ii) reduce the aforesaid percentage of Debentures, the Holders of which are
required to consent to any such supplemental indenture, without the consent of
the Holder of each Debenture then outstanding and affected thereby.  The
Indenture also contains provisions permitting the Holders of a majority in
aggregate principal amount of the Securities of any series at the time
outstanding affected thereby, on behalf of all of the Holders of the Debentures
of such series, to waive any Default or Event of Default with respect to such
series, and its consequences, except a Default or Event of Default in the
payment of the principal of or premium, if any, or interest on any of the
Securities of such series or in respect of a provision which under the Indenture
cannot be modified or amended without the consent of the Holder of each
Outstanding Security of that series affected.  Any such consent or waiver  by
the registered Holder of this Debenture (unless revoked as provided in the
Indenture) shall be conclusive and binding upon such Holder and upon all future
Holders and owners of this Debenture and of any Debenture issued in exchange
herefor or in place hereof (whether by registration of transfer or otherwise),
irrespective of  whether or not any notation of such consent or waiver is made
upon this Debenture.

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

          So long as no Event of Default with respect to the Debentures has
occurred and is continuing, the Company shall have the right at any time during
the term of the Debentures from time to time to extend the interest payment
period of such Debentures for up to 20 consecutive quarters (an "Extended
Interest Payment Period"), at the end of which period the Company shall pay all
interest then accrued and unpaid (together with the interest thereon at the rate
specified for the Debentures to the extent that payment of such interest is
enforceable under applicable law).  In the event that the Company exercises this
right, then (a) the Company shall not declare or pay any dividend on, make any
distributions with respect to, or redeem, purchase or acquire, or make a
liquidation payment with respect to, any of its capital stock (other than (i) as
a result of a reclassification of the Company's capital stock or the exchange or
conversion of one class or series


                                       17
<PAGE>

of the Company's capital stock for another class or series of the Company's
capital stock, (ii) any declaration of a dividend in connection with the
implementation of a shareholder rights plan, or the issuance of stock under any
such plan in the future, or the redemption or repurchase of any such rights
pursuant thereto, (iii) purchases of its common stock related to the issuance of
such stock under any of the Company's benefit plans for its directors, officers
or employees, (iv) obligations under any dividend reinvestment plan or stock
purchase plan of the Company, or (v) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged)
or make any guarantee payments with respect to the foregoing), (b) the Company
shall not make any payment of interest, principal or premium, if any, on or
repay, repurchase or redeem any debt securities (including guarantees) issued by
the Company that rank PARI PASSU with or junior to such Debentures, and (c) the
Company shall not make any guarantee payments with respect to the foregoing
(other than pursuant to the Guarantee and any similar guarantee issued by the
Company on behalf of holders of preferred securities issued by an issuer holding
Securities issued under the Indenture).  Prior to the termination of any such
Extended Interest Payment Period, the Company may further extend the interest
payment period; provided, that such Extended Interest Payment Period, together
with all such previous and further extensions thereof, may not exceed 20
consecutive quarters or extend beyond the maturity date of the Debenture.  At
the termination of any such Extended Interest Payment Period and upon the
payment of all accrued and unpaid interest and any additional amount then due,
the Company may commence a new Extended Interest Payment Period, subject to the
above requirements.

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

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

          No recourse shall be had for the payment of the principal of or the
interest on this Debenture, or for any claim based hereon, or otherwise in
respect hereof, or based on or in


                                       18
<PAGE>

respect of the Indenture, against any incorporator, stockholder, officer or
director, past, present or future, as such, of the Company or of any predecessor
or successor corporation, whether by virtue of any constitution, statute or rule
of law, or by the enforcement of any assessment or penalty or otherwise, all
such liability being, by the acceptance hereof and as part of the consideration
for the issuance hereof, expressly waived and released.

          [This Global Debenture is exchangeable for Debentures in definitive
form only under certain limited circumstances set forth in the Indenture.  The
Debentures of this series so issued are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof.]  As
provided in the Indenture and subject to certain limitations herein and therein
set forth, Debentures of this series so issued are exchangeable for a like
aggregate principal amount of Debentures of this series of a different
authorized denomination, as requested by the Holder surrendering the same.

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


                                   ARTICLE IX
                          ORIGINAL ISSUE OF DEBENTURES

SECTION 9.1.   ORIGINAL ISSUE OF DEBENTURES.

          Debentures in the aggregate principal amount of $200,000,000 may, upon
execution of this First Supplemental Indenture, be executed by the Company and
delivered to the Trustee for authentication, and the Trustee shall thereupon
authenticate and deliver said Debentures to or upon the written order of the
Company, signed by its Chairman, its President, or any Vice President and its
Treasurer or an Assistant Treasurer, without any further action by the Company.


                                    ARTICLE X
                                  MISCELLANEOUS

SECTION 10.1.  RATIFICATION OF INDENTURE.

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

SECTION 10.2.  TRUSTEE NOT RESPONSIBLE FOR RECITALS.

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


                                       19
<PAGE>

SECTION 10.3.  GOVERNING LAW.

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

SECTION 10.4.  SEPARABILITY.

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

SECTION 10.5.  COUNTERPARTS.

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

             [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK.]


                                       20
<PAGE>

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

                              PUBLIC SERVICE COMPANY OF COLORADO



                              By:                /s/ Brian P. Jackson
                                   ----------------------------------------
                                   Name:     Brian P. Jackson
                                   Title:    Senior Vice President
                                             and Chief Financial Officer

Attest:


By:  /s/ Teresa S. Madden
- ----------------------------

                              THE BANK OF NEW YORK



                              By:            /s/ Walter N. Gitlin
                                   ----------------------------------------
                                   Name:  Walter N. Gitlin
                                   Title:    Vice President


                                       21

<PAGE>


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


                               Guarantee Agreement

                                     between

                       PUBLIC SERVICE COMPANY OF COLORADO
                                 (as Guarantor)

                                       and

                              The Bank of New York
                        (as Preferred Guarantee Trustee)




                                   Dated as of

                                  May 11, 1998



- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

ARTICLE I  DEFINITIONS
     SECTION 1.01.  Definitions. . . . . . . . . . . . . . . . . . . . . . . . 2

ARTICLE II      TRUST INDENTURE ACT
     SECTION 2.01.  Trust Indenture Act; Application . . . . . . . . . . . . . 4
     SECTION 2.02.  List of Holders. . . . . . . . . . . . . . . . . . . . . . 4
     SECTION 2.03.  Reports by the Preferred Guarantee Trustee . . . . . . . . 4
     SECTION 2.04.  Periodic Reports to Preferred Guarantee Trustee. . . . . . 4
     SECTION 2.05.  Evidence of Compliance with Conditions Precedent . . . . . 5
     SECTION 2.06.  Events of Default; Waiver. . . . . . . . . . . . . . . . . 5
     SECTION 2.07.  Event of Default; Notice . . . . . . . . . . . . . . . . . 5
     SECTION 2.08.  Conflicting Interests. . . . . . . . . . . . . . . . . . . 6

ARTICLE III     POWERS, DUTIES AND RIGHTS OF THE PREFERRED GUARANTEE TRUSTEE
     SECTION 3.01.  Powers and Duties of the Preferred Guarantee Trustee . . . 6
     SECTION 3.02.  Certain Rights of Preferred Guarantee Trustee. . . . . . . 7

ARTICLE IV       PREFERRED GUARANTEE TRUSTEE
     SECTION 4.01.  Preferred Guarantee Trustee; Eligibility . . . . . . . . . 9
     SECTION 4.02.  Appointment, Removal and Resignation of the Preferred
                       Guarantee Trustee . . . . . . . . . . . . . . . . . . .10

ARTICLE V  GUARANTEE
     SECTION 5.01.  Guarantee. . . . . . . . . . . . . . . . . . . . . . . . .11
     SECTION 5.02.  Waiver of Notice and Demand. . . . . . . . . . . . . . . .11
     SECTION 5.03.  Obligations Not Affected . . . . . . . . . . . . . . . . .11
     SECTION 5.04.  Rights of Holders. . . . . . . . . . . . . . . . . . . . .12
     SECTION 5.05.  Guarantee of Payment . . . . . . . . . . . . . . . . . . .12
     SECTION 5.06.  Subrogation. . . . . . . . . . . . . . . . . . . . . . . .12
     SECTION 5.07.  Independent Obligations. . . . . . . . . . . . . . . . . .13

ARTICLE VI      SUBORDINATION
     SECTION 6.01.  Ranking. . . . . . . . . . . . . . . . . . . . . . . . . .13
     SECTION 6.02.  PARI PASSU Guarantees. . . . . . . . . . . . . . . . . . .13

ARTICLE VII  TERMINATION
     SECTION 7.01.  Termination. . . . . . . . . . . . . . . . . . . . . . . .13


                                       -i-
<PAGE>

ARTICLE VIII  INDEMNIFICATION
     SECTION 8.01.  Exculpation. . . . . . . . . . . . . . . . . . . . . . . .13
     SECTION 8.02.  Indemnification. . . . . . . . . . . . . . . . . . . . . .14

ARTICLE IX      MISCELLANEOUS
     SECTION 9.01.  Successors and Assigns . . . . . . . . . . . . . . . . . .14
     SECTION 9.02.  Amendments . . . . . . . . . . . . . . . . . . . . . . . .15
     SECTION 9.03.  Notices. . . . . . . . . . . . . . . . . . . . . . . . . .15
     SECTION 9.04.  Benefit. . . . . . . . . . . . . . . . . . . . . . . . . .16
     SECTION 9.05.  Interpretation . . . . . . . . . . . . . . . . . . . . . .16
     SECTION 9.06.  Governing Law. . . . . . . . . . . . . . . . . . . . . . .16


                                      -ii-
<PAGE>

                             CROSS-REFERENCE TABLE*

Section of                                                          Section of
Trust Indenture Act                                                 Guarantee of
1939, as amended                                                    Agreement
- -------------------                                                 ------------

310(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .           4.01(a)
310(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .     4.01(c), 2.08
310(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
311(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .           2.02(b)
311(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .           2.02(b)
311(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
312(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .           2.02(a)
312(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .           2.02(b)
313. . . . . . . . . . . . . . . . . . . . . . . . . . . . .              2.03
314(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .              2.04
314(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
314(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .              2.05
314(d) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
314(e) . . . . . . . . . . . . . . . . . . . . . . . . . . .  1.01, 2.05, 3.02
314(f) . . . . . . . . . . . . . . . . . . . . . . . . . . .        2.01, 3.02
315(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .           3.01(d)
315(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .              2.07
315(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .              3.01
315(d) . . . . . . . . . . . . . . . . . . . . . . . . . . .           3.01(d)
316(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .  1.01, 2.06, 5.04
316(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .              5.03
316(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .              8.02
317(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
317(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .      Inapplicable
318(a) . . . . . . . . . . . . . . . . . . . . . . . . . . .           2.01(b)
318(b) . . . . . . . . . . . . . . . . . . . . . . . . . . .              2.01
318(c) . . . . . . . . . . . . . . . . . . . . . . . . . . .          2.01(a)

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

*    This Cross-Reference Table does not constitute part of the Guarantee
     Agreement and shall not affect the interpretation of any of its terms or
     provisions.


                                      -iii-
<PAGE>

                               GUARANTEE AGREEMENT

     This GUARANTEE AGREEMENT (the "Preferred Securities Guarantee"), dated as
of May 11, 1998, is executed and delivered by Public Service Company of
Colorado, a Colorado corporation (the "Guarantor"), to The Bank of New York, as
trustee (the "Preferred Guarantee Trustee"), for the benefit of the Holders (as
defined herein) from time to time of the Preferred Securities (as defined
herein) of PSCO Capital Trust I, a Delaware statutory business trust (the
"Issuer").

     WHEREAS, pursuant to an Amended and Restated Declaration of Trust (the
"Declaration"), dated as of May 11, 1998 among the Trustees named therein, the
Guarantor, as Depositor, and the Holders from time to time of undivided
beneficial interests in the assets of the Issuer, the Issuer is issuing
$194,000,000 aggregate liquidation amount of its 7.60% Trust Originated
Preferred Securities (liquidation amount of $25 per preferred security) (the
"Preferred Securities") representing undivided beneficial interests in the
assets of the Issuer and having the terms set forth in the Declaration;

     WHEREAS, the Preferred Securities will be issued by the Issuer and the
proceeds thereof, together with the proceeds from the sale by the Issuer of its
Common Securities, will be used to purchase the Debentures (as defined in the
Declaration) of the Guarantor which will be deposited with The Bank of New York,
as Property Trustee under the Declaration, as Trust Property (as defined in the
Declaration);

     WHEREAS, as incentive for the Holders to purchase Preferred Securities, the
Guarantor desires irrevocably and unconditionally to agree, to the extent set
forth herein, to pay to the Holders of the Preferred Securities the Guarantee
Payments (as defined herein) and to make certain other payments on the terms and
conditions set forth herein; and

     WHEREAS, the Guarantor is also executing and delivering a guarantee
agreement (the "Common Securities Guarantee") in substantially identical terms
to this Preferred Securities Guarantee for the benefit of the holders of the
Common Securities (as defined herein), except that if an event of default (as
defined in the Indenture) has occurred and is continuing, the Guarantee Payments
under the Common Securities Guarantee are subordinated to the rights of Holders
of Preferred Securities to receive Guarantee Payments under this Preferred
Securities Guarantee.

     NOW, THEREFORE, in consideration of the purchase by each Holder of
Preferred Securities, which purchase the Guarantor hereby agrees shall benefit
the Guarantor, the Guarantor executes and delivers this Preferred Securities
Guarantee for the benefit of the Holders from time to time of the Preferred
Securities.



<PAGE>

                                    ARTICLE I

                                   DEFINITIONS

     SECTION 1.01.  Definitions.  As used in this Preferred Securities
Guarantee, each of the terms set forth below shall, unless the context otherwise
requires, have the following meaning. Each capitalized or otherwise defined term
used but not otherwise defined herein shall have the meaning assigned to such
terms in the Declaration as in effect on the date hereof.

     "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.

     "Common Securities" means the common securities representing undivided
beneficial interests in the assets of the Issuer and having the rights provided
therefor in the Declaration.

     "Covered Person" means any Holder or beneficial owner of Preferred
Securities.

     "Event of Default" shall have the meaning specified in Section 2.06 (a).

     "Guarantee Payments" means the following payments, without duplication,
with respect to the Preferred Securities, to the extent not paid or made by or
on behalf of the Issuer pursuant to the Declaration or by the Guarantor pursuant
to the Indenture: (i) any accumulated and unpaid Distributions required to be
paid on the Preferred Securities, to the extent the Issuer shall have funds
available therefor, (ii) the redemption price (the "Redemption Price") and all
accrued and unpaid Distributions to the date of redemption to the extent the
Issuer shall have funds available therefor, and (iii) upon a voluntary or
involuntary dissolution and liquidation of the Issuer (other than in connection
with a Distribution of Debentures to Holders of such Preferred Securities or the
redemption of all such Preferred Securities), the lesser of (a) the aggregate of
the liquidation amount of $25 per Preferred Security plus all accrued and unpaid
Distributions on the Preferred Securities to the date of payment, to the extent
the Issuer shall have funds available therefor and (b) the amount of assets of
the Issuer remaining available for Distribution to Holders of Preferred
Securities upon a dissolution and liquidation of the Issuer (in either case, the
"Liquidation Distribution").  If an event of default under the Indenture has
occurred and is continuing, the rights of holders of the Common Securities to
receive payments under the Common Securities Guarantee are subordinated to the
rights of Holders of Preferred Securities to receive Guarantee Payments.

     "Holder" means a Person in whose name a Preferred Security is registered in
the Securities Register; provided, however, that in determining whether the
holders of the requisite percentage of Preferred Securities have given any
request, notice, consent or waiver hereunder, "Holder"


                                       -2-
<PAGE>

shall not include the Guarantor, the Preferred Guarantee Trustee or any
Affiliate of the Guarantor or the Preferred Guarantee Trustee.

     "Indemnified Person" means the Preferred Guarantee Trustee, any Affiliate
of the Preferred Guarantee Trustee, or any officers, directors, shareholders,
members, partners, employees, representatives, nominees, custodians or agents of
the Preferred Guarantee Trustee.

     "Indenture" means the Indenture dated as of May 1, 1998, as amended or
supplemented from time to time, between Public Service Company of Colorado and
The Bank of New York, as trustee thereunder.

     "List of Holders" has the meaning specified in Section 2.02(a).

     "Majority in liquidation amount of the Preferred Securities" means, except
as provided by the Trust Indenture Act, a vote by the Holders of more than 50%
of the aggregate liquidation amount of all then outstanding Preferred Securities
issued by the Issuer.

     "Officers' Certificate" means a certificate signed by the Chairman, the
President, or any Senior or Executive Vice President and the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Guarantor.

     "Person" means any individual, corporation, partnership, limited liability
company, joint venture, association, joint-stock company, trust, unincorporated
organization, government or any agency or political subdivision thereof or any
other entity.

     "Preferred Guarantee Trustee" means The Bank of New York, until a Successor
Preferred Guarantee Trustee (as defined below) has been appointed and has
accepted such appointment pursuant to the terms of this Preferred Securities
Guarantee and thereafter means each such Successor Preferred Guarantee Trustee.

     "Responsible Officer" means, with respect to the Preferred Guarantee
Trustee, any Vice President, any Assistant Vice President, any Trust Officer or
Assistant Trust Officer or any other officer of the Corporate Trust Department
of the Guarantee 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 that officer's knowledge of and familiarity with the
particular subject.

     "Senior Indebtedness" means Senior Indebtedness as defined in the
Indenture.

     "Successor Preferred Guarantee Trustee" means a successor Preferred
Guarantee Trustee possessing the qualifications to act as Preferred Guarantee
Trustee under Section 4.01.

     "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


                                       -3-
<PAGE>

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.

                                   ARTICLE II

                               TRUST INDENTURE ACT

     SECTION 2.01.  Trust Indenture Act; Application.

     (a)  This Preferred Securities Guarantee is subject to the provisions of
the Trust Indenture Act that are required to be part of this Preferred
Securities Guarantee and shall, to the extent applicable, be governed by such
provisions.

     (b)  If, and to the extent that any provision of this Preferred Securities
Guarantee limits, qualifies or conflicts with the duties imposed by Sections 310
to 317, inclusive, of the Trust Indenture Act, such imposed duties shall
control.

     SECTION 2.02.  List of Holders.

     (a)  The Guarantor shall furnish or cause to be furnished to the Preferred
Guarantee Trustee (i) semiannually, on or before January 15 and July 15 of each
year, a list, in such form as the Preferred Guarantee Trustee may reasonably
require, of the names and addresses of the Holders ("List of Holders") as of a
date not more than 15 days prior to the delivery thereof, and (ii) at such other
times as the Preferred Guarantee Trustee may request in writing, within 30 days
after the receipt by the Guarantor of any such request, a List of Holders as of
a date not more than 15 days prior to the time such list is furnished, in each
case to the extent such information is in the possession or control of the
Guarantor and is not identical to a previously supplied List of Holders or has
not otherwise been received by the Preferred Guarantee Trustee in its capacity
as such. The Preferred Guarantee Trustee may destroy any List of Holders
previously given to it on receipt of a new List of Holders.

     (b)  The Preferred Guarantee Trustee shall comply with its obligations
under Sections 311(a), Section 311(b) and Section 312(b) of the Trust Indenture
Act.

     SECTION 2.03.  Reports by the Preferred Guarantee Trustee.  Within 60 days
after May 31 of each year, the Preferred Guarantee Trustee shall provide to the
Holders such reports as are required by Section 313 of the Trust Indenture Act,
if any, in the form and in the manner provided by Section 313 of the Trust
Indenture Act.  The Preferred Guarantee Trustee shall also comply with the
requirements of Section 313(d) of the Trust Indenture Act.

     SECTION 2.04.  Periodic Reports to Preferred Guarantee Trustee.  The
Guarantor shall provide to the Preferred Guarantee Trustee, the Securities and
Exchange Commission and the Holders such documents, reports and information, if
any, as required by Section 314 of the Trust Indenture Act and the compliance
certificate required by Section 314 of the Trust Indenture Act in the form and
manner and at the times required by Section 314 of the Trust Indenture Act.


                                       -4-
<PAGE>

     SECTION 2.05.  Evidence of Compliance with Conditions Precedent.  The
Guarantor shall provide to the Preferred Guarantee Trustee such evidence of
compliance with such conditions precedent, if any, provided for in this
Preferred Securities Guarantee that relate to any of the matters set forth in
Section 314(c) of the Trust Indenture Act.  Each Officers' Certificate and
Opinion of Counsel delivered with respect to compliance with a condition or
covenant provided for in this Preferred Securities Guarantee shall include:

          (a)  a statement that each officer signing the Officers' Certificate
     or Opinion of Counsel has read the covenant or condition and the definition
     relating thereto;

          (b)  a brief statement of the nature and scope of the examination or
     investigation undertaken by each officer in rendering the Officers'
     Certificate or Opinion of Counsel and upon which the statements contained
     therein are based;

          (c)  a statement that each such officer has made such examination or
     investigation as, in such officer's opinion, is necessary to enable such
     officer to express an informed opinion as to whether or not such covenant
     or condition has been complied with; and

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

     SECTION 2.06.  Events of Default; Waiver.

     (a)  An Event of Default means a default by the Guarantor on any of its
payment or other obligations under this Preferred Securities Guarantee;
provided, that except with respect to a default resulting from a failure to pay
any Guarantee Payment, the Guarantor shall have received notice of such default
and shall not have cured such default within 60 days after receipt of such
notice.

     (b)   The Holders of a Majority in liquidation amount of the Preferred
Securities may, by vote, on behalf of the Holders, waive any past Event of
Default and its consequences. Upon such waiver, any such Event of Default shall
cease to exist, and any Event of Default arising therefrom shall be deemed to
have been cured, for every purpose of this Preferred Securities Guarantee, but
no such waiver shall extend to any subsequent or other default or Event of
Default or impair any right consequent therefrom.

     SECTION 2.07.  Event of Default; Notice.

     (a)  The Preferred Guarantee Trustee shall, within 90 days after the
occurrence of an Event of Default, transmit by mail, first class postage
prepaid, to the Holders, notices of all Events of Default known to the Preferred
Guarantee Trustee, unless such defaults have been cured before the giving of
such notice, provided, that, except in the case of a default in the payment of a
Guarantee Payment, the Preferred Guarantee Trustee shall be protected in
withholding such notice if and so long as the Board of Directors, the executive
committee or a trust committee of


                                       -5-
<PAGE>

directors and/or Responsible Officers of the Preferred Guarantee Trustee in good
faith determines that the withholding of such notice is in the interests of the
Holders.

     (b)  The Preferred Guarantee Trustee shall not be deemed to have knowledge
of any Event of Default unless the Preferred Guarantee Trustee shall have
received written notice, or a Responsible Officer charged with the
administration of the Declaration shall have obtained written notice, of such
Event of Default.

     SECTION 2.08.  Conflicting Interests.  The Declaration shall be deemed to
be specifically described in this Preferred Securities Guarantee for the
purposes of clause (i) of the first proviso contained in Section 310(b) of the
Trust Indenture Act.

                                   ARTICLE III

                        POWERS, DUTIES AND RIGHTS OF THE
                           PREFERRED GUARANTEE TRUSTEE

     SECTION 3.01.  Powers and Duties of the Preferred Guarantee Trustee.

     (a)  This Preferred Securities Guarantee shall be held by the Preferred
Guarantee Trustee for the benefit of the Holders, and the Preferred Guarantee
Trustee shall not transfer this Preferred Securities Guarantee to any Person
except a Holder exercising his or her rights pursuant to Section 5.04(iv) or to
a Successor Preferred Guarantee Trustee on acceptance by such Successor
Preferred Guarantee Trustee of its appointment to act as Successor Preferred
Guarantee Trustee.  The right, title and interest of the Preferred Guarantee
Trustee shall automatically vest in any Successor Preferred Guarantee Trustee
upon acceptance by such Successor Preferred Guarantee Trustee of its appointment
hereunder and such vesting and cessation of title shall be effective whether or
not conveyancing documents have been executed and delivered pursuant to the
appointment of such Successor Preferred Guarantee Trustee.

     (b)  If an Event of Default has occurred and is continuing, the Preferred
Guarantee Trustee shall enforce this Preferred Securities Guarantee for the
benefit of the Holders.

     (c)  The Preferred Guarantee Trustee, before the occurrence of any Event of
Default and after the curing of all Events of Default that may have occurred,
shall undertake to perform only such duties as are specifically set forth in
this Preferred Securities Guarantee, and no implied covenants shall be read into
this Preferred Securities Guarantee against the Preferred Guarantee Trustee.  In
case an Event of Default has occurred and is continuing (and has not been cured
or waived pursuant to Section 2.06), the Preferred Guarantee Trustee shall
exercise such of the rights and powers vested in it by this Preferred Securities
Guarantee, and use the same degree of care and skill in its exercise thereof, as
a prudent person would exercise or use in the conduct of his or her own affairs.


                                       -6-
<PAGE>

     (d)  No provision of this Preferred Securities Guarantee shall be construed
to relieve the Preferred Guarantee Trustee from liability for its own negligent
action, its own negligent failure to act or its own willful misconduct, except
that:

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

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

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

          (ii)  the Preferred Guarantee Trustee shall not be liable for any
     error of judgment made in good faith by a Responsible Officer of the
     Preferred Guarantee Trustee, unless it shall be proved that the Preferred
     Guarantee Trustee was negligent in ascertaining the pertinent facts upon
     which such judgment was made;

          (iii) the Preferred Guarantee Trustee shall not be liable with respect
     to any action taken or omitted to be taken by it in good faith in
     accordance with the direction of the Holders of a Majority in liquidation
     amount of the Preferred Securities relating to the time, method and place
     of conducting any proceeding for any remedy available to the Preferred
     Guarantee Trustee, or exercising any trust or power conferred upon the
     Preferred Guarantee Trustee under this Preferred Securities Guarantee; and

          (iv)  no provision of this Preferred Securities Guarantee shall
     require the Preferred Guarantee Trustee to expend or risk its own funds or
     otherwise incur personal financial liability in the performance of any of
     its duties or in the exercise of any of its rights or powers, if the
     Preferred Guarantee Trustee shall have reasonable grounds for believing
     that the repayment of such funds or liability is not reasonably assured to
     it under the terms of this Preferred Securities Guarantee or reasonable
     indemnity against such risk or liability is not reasonably assured to it.


                                       -7-
<PAGE>

     SECTION 3.02.  Certain Rights of Preferred Guarantee Trustee.

     (a)  Subject to the provisions of Section 3.01:

          (i)   The Preferred Guarantee Trustee may rely and shall be fully
     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, sent or presented by the proper party or parties.

          (ii)  Any direction or act of the Guarantor contemplated by this
     Preferred Securities Guarantee shall be sufficiently evidenced by an
     Officers' Certificate unless otherwise prescribed herein.

          (iii) Whenever, in the administration of this Preferred Securities
     Guarantee, the Preferred Guarantee Trustee shall deem it desirable that a
     matter be proved or established before taking, suffering or omitting to
     take any action hereunder, the Preferred Guarantee Trustee (unless other
     evidence is herein specifically prescribed) may, in the absence of bad
     faith on its part, request and rely upon an Officers' Certificate which,
     upon receipt of such request from the Preferred Guarantee Trustee, shall be
     promptly delivered by the Guarantor.

          (iv)  The Preferred Guarantee Trustee may consult with legal counsel,
     and the written advice or Opinion of Counsel with respect to legal matters
     shall be full and complete authorization and protection in respect of any
     action taken, suffered or omitted to be taken by it hereunder in good faith
     and in accordance with such advice or opinion. Such legal counsel may be
     legal counsel to the Guarantor or any of its Affiliates and may be one of
     its employees.  The Preferred Guarantee Trustee shall have the right at any
     time to seek instructions concerning the administration of this Preferred
     Securities Guarantee from any court of competent jurisdiction.

          (v)   The Preferred Guarantee Trustee shall be under no obligation to
     exercise any of the rights or powers vested in it by this Preferred
     Securities Guarantee at the request or direction of any Holder, unless such
     Holder shall have provided to the Preferred Guarantee Trustee such
     reasonable indemnity as would satisfy a reasonable person in the position
     of the Preferred Guarantee Trustee, against the costs, expenses (including
     attorneys' fees and expenses) and liabilities that might be incurred by it
     in complying with such request or direction; provided that, nothing
     contained in this Section 3.02(a)(v) shall be taken to relieve the
     Preferred Guarantee Trustee, upon the occurrence of an Event of Default, of
     its obligation to exercise the rights and powers vested in it by this
     Preferred Securities Guarantee.

          (vi)  The Preferred Guarantee 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,


                                       -8-
<PAGE>

     note, other evidence of indebtedness or other paper or document, but the
     Preferred Guarantee Trustee, in its discretion, may make such further
     inquiry or investigation into such facts or matters as it may see fit.

          (vii)  The Preferred Guarantee Trustee may execute any of the trusts
     or powers hereunder or perform any duties hereunder either directly or by
     or through its agents or attorneys, and the Preferred Guarantee Trustee
     shall not be responsible for any misconduct or negligence on the part of
     any such agent or attorney appointed with due care by it hereunder.

          (viii) Any action taken by the Preferred Guarantee Trustee or its
     agents hereunder shall bind the Holders of the Preferred Securities, and
     the signature of the Preferred Guarantee Trustee or its agents alone shall
     be sufficient and effective to perform any such action.  No third party
     shall be required to inquire as to the authority of the Preferred Guarantee
     Trustee to so act or as to its compliance with any of the terms and
     provisions of this Preferred Securities Guarantee, both of which shall be
     conclusively evidenced by the Preferred Guarantee Trustee's or its agent's
     taking such action.

          (ix)   Whenever in the administration of this Preferred Securities
     Guarantee the Preferred Guarantee Trustee shall deem it desirable to
     receive instructions with respect to enforcing any remedy or right or
     taking any other action hereunder, the Preferred Guarantee Trustee (A) may
     request instructions from the Holders, (B) may refrain from enforcing such
     remedy or right or taking such other action until such instructions are
     received, and (C) shall be protected in acting in accordance with such
     instructions.

     (b)  No provision of this Preferred Securities Guarantee shall be deemed to
impose any duty or obligation on the Preferred Guarantee Trustee to perform any
act or acts or exercise any right, power, duty or obligation conferred or
imposed on it in any jurisdiction in which it shall be illegal, or in which the
Preferred Guarantee Trustee shall be unqualified or incompetent in accordance
with applicable law, to perform any such act or acts or to exercise any such
right, power, duty or obligation.  No permissive power or authority available to
the Preferred Guarantee Trustee shall be construed to be a duty to act in
accordance with such power and authority.

                                   ARTICLE IV

                           PREFERRED GUARANTEE TRUSTEE

     SECTION 4.01.  Preferred Guarantee Trustee; Eligibility.

     (a)  There shall at all times be a Preferred Guarantee Trustee which shall:

          (i)    not be an Affiliate of the Guarantor; and

          (ii)   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 fifty
     million U.S. dollars


                                       -9-
<PAGE>

     ($50,000,000), and shall be a corporation meeting the requirements of
     Section 310(a) of the Trust Indenture Act.  If such corporation publishes
     reports of condition at least annually, pursuant to law or to the
     requirements of the 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 corporation shall be deemed
     to be its combined capital and surplus as set forth in its most recent
     report of condition so published.

     (b)  If at any time the Preferred Guarantee Trustee shall cease to be
eligible to so act under Section 4.01(a), the Preferred Guarantee Trustee shall
immediately resign in the manner and with the effect set out in Section 4.02(c).

     (c)  If the Preferred Guarantee Trustee has or shall acquire any
"conflicting interest" within the meaning of Section 310(b) of the Trust
Indenture Act, the Preferred Guarantee Trustee and Guarantor shall in all
respects comply with the provisions of Section 310(b) of the Trust Indenture
Act.  In determining whether the Preferred Guarantee Trustee has a "conflicting
interest" within the meaning of Section 310(b)(1) of the Trust Indenture Act,
the provisions contained in the proviso to Section 310(b)(1) of the Trust
Indenture Act and the Preferred Guarantee Trustee's Statement of Eligibility on
Form T-1 shall be deemed incorporated herein.

     SECTION 4.02.  Appointment, Removal and Resignation of the Preferred
Guarantee Trustee.

     (a)  Subject to Section 4.02(b), the Preferred Guarantee Trustee may be
appointed or removed without cause at any time by the Guarantor.

     (b)  The Preferred Guarantee Trustee shall not be removed until a new,
eligible Preferred Guarantee Trustee has been appointed (a "Successor Preferred
Guarantee Trustee") and has accepted such appointment and assumed the applicable
obligations hereunder by written instrument executed by such Successor Preferred
Guarantee Trustee and delivered to the Guarantor.

     (c)  The Preferred Guarantee Trustee may resign from office (without need
for prior or subsequent accounting) by an instrument in writing executed by the
Preferred Guarantee Trustee and delivered to the Guarantor, which resignation
shall not take effect until a Successor Preferred Guarantee Trustee has been
appointed and has accepted such appointment by instrument in writing executed by
such Successor Preferred Guarantee Trustee and delivered to the Guarantor and
the resigning Preferred Guarantee Trustee.

     (d)  If no Successor Preferred Guarantee Trustee shall have been appointed
and accepted appointment as provided in this Section 4.02 within 60 days after
delivery to the Guarantor of an instrument of resignation, the resigning
Preferred Guarantee Trustee may petition, at the expense of the Guarantor, any
court of competent jurisdiction for appointment of a Successor Preferred
Guarantee Trustee.  Such court may thereupon, after prescribing such notice, if
any, as it may deem proper, appoint a Successor Preferred Guarantee Trustee.


                                      -10-
<PAGE>

                                    ARTICLE V

                                    GUARANTEE

     SECTION 5.01.  Guarantee.  The Guarantor irrevocably and unconditionally
agrees to pay in full to the Holders of the Outstanding Preferred Securities the
Guarantee Payments (without duplication of amounts theretofore paid by or on
behalf of the Issuer pursuant to the Declaration or by the Guarantor pursuant to
the Indenture), as and when due, regardless of any defense, right of set-off or
counterclaim which the Issuer may have or assert.  The Guarantor's obligation to
make a Guarantee Payment may be satisfied by direct payment of the required
amounts by the Guarantor to the Holders or by causing the Issuer to pay such
amounts to the Holders.

     SECTION 5.02.  Waiver of Notice and Demand.  The Guarantor hereby waives
notice of acceptance of the Preferred Securities Guarantee and of any liability
to which it applies or may apply, presentment, demand for payment, any right to
require a proceeding first against the Preferred Guarantee Trustee, the Issuer
or any other Person before proceeding against the Guarantor, protest, notice of
nonpayment, notice of dishonor, notice of redemption and all other notices and
demands.

     SECTION 5.03.  Obligations Not Affected.  The obligations, covenants,
agreements and duties of the Guarantor under this Preferred Securities Guarantee
shall in no way be affected or impaired by reason of the happening from time to
time of any of the following:

     (a)  the release or waiver, by operation of law or otherwise, of the
performance or observance by the Issuer of any express or implied agreement,
covenant, term or condition relating to the Preferred Securities to be performed
or observed by the Issuer;

     (b)  the extension of time for the payment by the Issuer of all or any
portion of the Distributions (other than an extension of time for payment of
Distributions that results from an Extension Period on the Debentures as so
provided in the Indenture), Redemption Price, Liquidation Distribution or any
other sums payable under the terms of the Preferred Securities or the extension
of time for the performance of any other obligation under, arising out of, or in
connection with, the Preferred Securities;

     (c)  any failure, omission, delay or lack of diligence on the part of the
Holders to enforce, assert or exercise any right, privilege, power or remedy
conferred on the Holders pursuant to the terms of the Preferred Securities, or
any action on the part of the Issuer granting indulgence or extension of any
kind;

     (d)  the voluntary or involuntary liquidation, dissolution, sale of any
collateral, receivership, insolvency, bankruptcy, assignment for the benefit of
creditors, reorganization, arrangement, composition or readjustment of debt
of, or other similar proceedings affecting, the Issuer or any of the assets of
the Issuer;


                                      -11-
<PAGE>

     (e)  any invalidity of, or detect or deficiency in, the Preferred
Securities;

     (f)  the settlement or compromise of any obligation guaranteed hereby or
hereby incurred; or

     (g)  to the extent permitted by law, any other circumstance whatsoever that
might otherwise constitute a legal or equitable discharge or defense of a
guarantor, it being the intent of this Section 5.03 that the obligations of the
Guarantor hereunder shall be absolute and unconditional under any and all
circumstances.

     There shall be no obligation of the Holders to give notice to, or obtain
the consent of, the Guarantor with respect to the happening of any of the
foregoing.

     SECTION 5.04.  Rights of Holders.  The Guarantor expressly acknowledges
that:  (i) this Preferred Securities Guarantee will be deposited with the
Preferred Guarantee Trustee to be held for the benefit of the Holders; (ii) the
Preferred Guarantee Trustee has the right to enforce this Preferred Securities
Guarantee on behalf of the Holders; (iii) the Holders of a Majority in
liquidation amount of the Preferred Securities have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Preferred Guarantee Trustee in respect of this Preferred Securities
Guarantee or exercise or direct the exercise of any trust or power conferred
upon the Preferred Guarantee Trustee under this Preferred Securities Guarantee;
and (iv) any Holder may institute a legal proceeding directly against the
Guarantor to enforce its rights under this Preferred Securities Guarantee,
without first instituting a legal proceeding against the Preferred Guarantee
Trustee, the Issuer or any other Person.

     SECTION 5.05.  Guarantee of Payment.  This Preferred Securities Guarantee
creates a guarantee of payment and not of collection (i.e., the guaranteed party
may institute a legal proceeding directly against the Guarantor to enforce its
rights under the Preferred Securities Guarantee without first instituting a
legal proceeding against any other person or entity).  This Preferred Securities
Guarantee will not be discharged except by payment of the Guarantee Payments in
full to the extent not previously paid or upon Distribution to the Holders of
the Preferred Securities of the corresponding series of Debentures as provided
in the Declaration.

     SECTION 5.06.  Subrogation.  The Guarantor shall be subrogated to all (if
any) rights of the Holders against the Issuer in respect of any amounts paid to
the Holders by the Guarantor under this Preferred Securities Guarantee and shall
have the right to waive payment by the Issuer pursuant to Section 5.01;
provided, however, that the Guarantor shall not (except to the extent required
by mandatory provisions of law) be entitled to enforce or exercise any rights
which it may acquire by way of subrogation or any indemnity, reimbursement or
other agreement, in all cases as a result of payment under this Preferred
Securities Guarantee, if, at the time of any such payment, any amounts are due
and unpaid under this Preferred Securities Guarantee.  If any amount shall be
paid to the Guarantor in violation of the preceding sentence, the Guarantor
agrees to hold such amount in trust for the Holders and to pay over such amount
to the Holders.


                                      -12-
<PAGE>

     SECTION 5.07.  Independent Obligations.  The Guarantor acknowledges that
its obligations hereunder are independent of the obligations of the Issuer with
respect to the Preferred Securities and that the Guarantor shall be liable as
principal and as debtor hereunder to make Guarantee Payments pursuant to the
terms of this Preferred Securities Guarantee notwithstanding the occurrence of
any event referred to in subsections (a) through (g), inclusive, of Section 5.03
hereof.

                                   ARTICLE VI

                                  SUBORDINATION

     SECTION 6.01.  Ranking.  This Preferred Securities Guarantee shall
constitute an unsecured obligation of the Guarantor and shall rank
(a) subordinate and junior in right of payment to all general liabilities of the
Guarantor, (b) PARI PASSU with the senior most preferred stock now or hereafter
issued by the Guarantor and with any guarantee now or hereafter issued by the
Guarantor in respect of preferred stock of any affiliate of the Guarantor and
(c) senior to the Guarantor's common stock.

     SECTION 6.02.  PARI PASSU Guarantees.  This Preferred Securities Guarantee
shall rank PARI PASSU with any similar Preferred Securities Guarantees issued by
the Guarantor on behalf of the holders of trust preferred securities issued by
other PSCO Trusts.

                                   ARTICLE VII

                                   TERMINATION

     SECTION 7.01.  Termination.  This Preferred Securities Guarantee shall
terminate and be of no further force and effect upon full payment of the
Redemption Price or Liquidation Distribution for the Preferred Securities or
upon Distribution of the Debentures to the Holders of the Preferred Securities.
This Preferred Securities Guarantee will continue to be effective or will be
reinstated, as the case may be, if at any time any Holder of the Preferred
Securities must restore payment of any sums paid under the Preferred Securities
or this Preferred Securities Guarantee.

                                  ARTICLE VIII

                                 INDEMNIFICATION

     SECTION 8.01.  Exculpation.

     (a)  No Indemnified Person shall be liable, responsible or accountable in
damages or otherwise to the Guarantor or any Covered Person for any loss, damage
or claim incurred by reason of any act or omission performed or omitted by such
Indemnified Person in good faith in accordance with this Preferred Securities
Guarantee and in a manner that such Indemnified Person reasonably believed to be
within the scope of the authority conferred on such Indemnified Person


                                      -13-
<PAGE>

by this Preferred Securities Guarantee or by law, except that an Indemnified
Person shall be liable for any such loss, damage or claim incurred by reason of
such Indemnified Person's negligence or willful misconduct with respect to such
acts or omissions.

     (b)  An Indemnified Person shall be fully protected in relying in good
faith upon the records of the Guarantor and upon such information, opinions,
reports or statements presented to the Guarantor by any Person as to matters the
Indemnified Person reasonably believes are within such other Person's
professional or expert competence and who has been selected with reasonable care
by or on behalf of the Guarantor, including information, opinions, reports or
statements as to the value and amount of the assets, liabilities, profits,
losses, or any other facts pertinent to the existence and amount of assets from
which Distributions to Holders of Preferred Securities might properly be paid.

     SECTION 8.02.  Indemnification.

     (a)  To the fullest extent permitted by applicable law, the Guarantor shall
indemnify and hold harmless each Indemnified Person from and against any loss,
damage or claim incurred by such Indemnified Person by reason of any act or
omission performed or omitted by such Indemnified Person in good faith in
accordance with this Preferred Securities Guarantee and in a manner such
Indemnified Person reasonably believed to be within the scope of authority
conferred on such Indemnified Person by this Preferred Securities Guarantee,
except that no Indemnified Person shall be entitled to be indemnified in respect
of any loss, damage or claim incurred by such Indemnified Person by reason of
negligence or willful misconduct with respect to such acts or omissions.

     (b)  To the fullest extent permitted by applicable law, reasonable expenses
(including legal fees) incurred by an Indemnified Person in defending any claim,
demand, action, suit or proceeding shall, from time to time, be advanced by the
Guarantor prior to the final disposition of such claim, demand, action, suit or
proceeding upon receipt by the Guarantor of an undertaking by or on behalf of
the Indemnified Person to repay such amount if it shall be determined that the
Indemnified Person is not entitled to be indemnified as authorized in
Section 8.02(a).

     (c)  The obligation to indemnify as set forth in this Section 8.02 shall
survive the termination of the Preferred Securities Guarantee.

                                   ARTICLE IX

                                  MISCELLANEOUS

     SECTION 9.01.  Successors and Assigns.  All guarantees and agreements
contained in this Preferred Securities Guarantee shall bind the successors,
assigns, receivers, trustees and representatives of the Guarantor and shall
inure to the benefit of the Holders of the Preferred Securities then
outstanding.  The Guarantor may not consolidate with or merge with or into, or
sell, convey, transfer or lease its properties and assets as an entirety or
substantially as an entirety (either in one transaction or a series of
transactions) to, any Person unless permitted under Article


                                      -14-
<PAGE>

Eight of the Indenture.  In connection with a consolidation, merger or sale
involving the Guarantor that is permitted under Article Eight of the Indenture
the Person formed by or surviving  such consolidation or merger or to which such
sale, conveyance, transfer or lease shall have been made, if other than the
Guarantor, shall expressly assume all of the obligations of the Guarantor
hereunder and under the Declaration.

     SECTION 9.02.  Amendments.  Except with respect to any changes which do not
adversely affect the rights of the Holders in any material respect (in which
case no consent of the Holders will be required), this Preferred Securities
Guarantee may only be amended with the prior approval of the Holders of a
Majority in liquidation amount of the Preferred Securities  (excluding any
Preferred Securities held by the Guarantor or an Affiliate thereof).  The
provisions of Article VI of the Declaration concerning meetings of the Holders
shall apply to the giving of such approval.

     SECTION 9.03.  Notices.  Any notice, request or other communication
required or permitted to be given hereunder shall be in writing and delivered,
telecopied or mailed by first class mail, postage prepaid, as follows:

          (a)  if given to the Guarantor, to the address set forth below or such
     other address as the Guarantor may give notice of to the Holders:

          Public Service Company of Colorado
          1225 17th Street
          Denver, CO  80202-5533
          Facsimile No:  [         ]
          Attention:  [             ]

          (b)  if given to the Issuer, in care of the Preferred Guarantee
     Trustee, at the Issuer's (and the Preferred Guarantee Trustee's) address
     set forth below or such other address as the Preferred Guarantee Trustee on
     behalf of the Issuer may give notice to the Holders:

          PSCO Capital Trust I
          1225 17th Street
          Denver, CO  80202-5533
          Facsimile No:  [         ]
          Attention:  [             ]

     with a copy to:

          The Bank of New York
          101 Barclay Street, 21st Floor
          New York, NY 10286
          Facsimile No:  (212) 815-5915
          Attention:  Walter Gitlin


                                      -15-
<PAGE>

          (c)  if given to any Holder, at the address set forth in the
Securities Register.

     All notices hereunder shall be deemed to have been given when received in
person, telecopied with receipt confirmed, or mailed by first class mail,
postage prepaid except that if a notice or other document is refused delivery or
cannot be delivered because of a changed address of which no notice was given,
such notice or other document shall be deemed to have been delivered on the date
of such refusal or inability to deliver.

     SECTION 9.04.  Benefit.  This Preferred Securities Guarantee is solely for
the benefit of the Holders and is not separately transferable from the Preferred
Securities.

     SECTION 9.05.  Interpretation.  In this Preferred Securities Guarantee,
unless the context otherwise requires:

          (a)  all references to "the Preferred Securities Guarantee" or "this
     Preferred Securities Guarantee" are to this Preferred Securities Guarantee
     as modified, supplemented or amended from time to time;

          (b)  all references in this Preferred Securities Guarantee to Articles
     and Sections are to Articles and Sections of this Preferred Securities
     Guarantee unless otherwise specified;

          (c)  a term defined in the Trust Indenture Act has the same meaning
     when used in this Preferred Securities Guarantee unless otherwise defined
     in this Preferred Securities Guarantee or unless the context otherwise
     requires;

          (d)  a reference to the singular includes the plural and vice versa;
     and

          (e)  the masculine, feminine or neuter genders used herein shall
     include the masculine, feminine and neuter genders.

     SECTION 9.06.  Governing Law.  THIS PREFERRED SECURITIES GUARANTEE SHALL BE
GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF
NEW YORK WITHOUT REGARD TO THE CONFLICT OF LAW PRINCIPLES THEREOF.

     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.


                                      -16-
<PAGE>

     THIS PREFERRED SECURITIES GUARANTEE is executed as of the day and year
first above written.

                              PUBLIC SERVICE COMPANY OF COLORADO,
                                 as Guarantor

                              By:       /s/ Brian P. Jackson
                                 ----------------------------------
                                 Name:  Brian P. Jackson
                                 Title: Senior Vice President and
                                        Chief Financial Officer

                              THE BANK OF NEW YORK,
                                 as Preferred Guarantee Trustee

                              By:       /s/ Walter N. Gitlin
                                 ----------------------------------
                                 Name:  Walter N. Gitlin
                                 Title: Vice President


                                      -17-

<PAGE>

              [LETTERHEAD LEBOEUF, LAMB, GREENE & MACRAE, L.L.P.]



                                                   May 11, 1998



Public Service Company of Colorado
PSCO Capital Trust I
1225 Seventeenth Street
Suite 900
Denver, Colorado 80202


     Re: $194,000,000 PSCO CAPITAL TRUST I 7.60% PREFERRED SECURITIES

Dear Sir or Madam:

     We have acted as special counsel to you (the "Company") in connection 
with the registration of Preferred Securities to be issued by PSCO Capital 
Trust I and the registration of the related Guarantee Agreement and 
Subordinated Debentures of the Company and hereby confirm to you our opinion 
that the statements made in the Prospectus included in the Registration 
Statement filed on Form S-3 under the caption "UNITED STATES TAXATION" are 
accurate, complete and correct, and fairly summarize the information set 
forth therein, based upon current law and the assumptions stated or referred 
to therein.

     We consent to the filing of this opinion as an exhibit to the 
Registration Statement.


                                      /s/ LeBoeuf, Lamb, Greene & MacRae, L.L.P.


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