PUBLIC SERVICE CO OF COLORADO
S-3, 1998-03-06
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>                                       
                 As filed with the Securities and Exchange 
                         Commission on March 6, 1998
                                                          Registration No. 333-
- -------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549
                                       
                             --------------------

                                   FORM S-3
                            REGISTRATION STATEMENT
                       UNDER THE SECURITIES ACT OF 1933
                                                         
                             --------------------

 PUBLIC SERVICE COMPANY            Colorado                 84-0296600
       OF COLORADO
  PSCO Capital Trust I             Delaware                 Applied For
                               (State or other           (I.R.S. Employer
                               jurisdiction of        Identification Number)
                               incorporation or
                                organization)

           1225 17th Street, Denver, CO 80202-5533, (303) 571-7511
             (Address, including zip code, and telephone number, 
    including area code, of each registrant's principal executive offices)
                                       
                             --------------------

                               Brian P. Jackson
               Senior Vice President and Chief Financial Officer
                      Public Service Company of Colorado
             1225 17th Street, Denver, CO 80202-5533, (303) 571-7511
            (Name, address, including zip code, and telephone number, 
          including area code, of agent for service for each registrant)

                             --------------------
                                       
                                   Copies to:

     S.A. MARSHALL, ESQ.                                   G.W. WOLF, ESQ.
   LeBoeuf, Lamb, Greene &                             Cahill Gordon & Reindel
        MacRae L.L.P.                                      80 Pine Street
    125 West 55th Street                               New York, NY 10005-1702
   New York, NY 10019-5389                                 (212) 701-3000
       (212) 424-8000

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

     Approximate date of commencement of proposed sale to the public: At such 
time or times after the effective date of this Registration Statement as the 
registrant shall determine based on market conditions and other factors.
       If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box./ /
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering./ /
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering./ /
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box./ /

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







                         CALCULATION OF REGISTRATION FEE

<TABLE>
- ----------------------------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                         Proposed Maximum
                                                                             Offering          Proposed Maximum
             Title of Each Class of                    Amount to          Price Per Unit      Aggregate Offering      Amount of
           Securities to be Registered             be Registered (1)        (1)(2)(3)           Price (1)(2)(3)   Registration Fee
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                   <C>                  <C>                 <C>
Preferred Securities of PSCO Capital Trust I
- ----------------------------------------------------------------------------------------------------------------------------------
First Collateral Trust Bonds of Public Service
 Company of Colorado
- ----------------------------------------------------------------------------------------------------------------------------------
Senior Debt Securities of Public Service Company
 of Colorado
- ----------------------------------------------------------------------------------------------------------------------------------
Subordinated Debt Securities of Public Service
 Company of Colorado
- ----------------------------------------------------------------------------------------------------------------------------------
Guarantee of Preferred Securities of PSCO
 Capital Trust I by Public Service Company of 
 Colorado (4)
- ----------------------------------------------------------------------------------------------------------------------------------
                      Total                           $450,000,000             100%               $450,000,000        $132,750
- ----------------------------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
(1)  Such indeterminate number of Preferred Securities of PSCO Capital Trust I 
     and such indeterminate principal amount of First Collateral Trust Bonds, 
     Senior Debt Securities and Subordinated Debt Securities of Public Service 
     Company of Colorado as may be from time to time issued at indeterminate 
     prices.  Subordinated Debt Securities of Public Service Company of 
     Colorado may be issued and sold to PSCO Capital Trust I, in which event 
     such Subordinated Debt Securities may later be distributed to the holders 
     of Preferred Securities upon a dissolution of PSCO Capital Trust I, and 
     the distribution of the assets thereof.
(2)  Estimated solely for purposes of calculating the registration fee 
     pursuant to Rule 457.  The aggregate public offering price of the Preferred
     Securities of PSCO Capital Trust I and First Collateral Trust Bonds, Senior
     Debt Securities and Subordinated Debt Securities of Public Service Company
     of Colorado registered hereby will not exceed $450,000,000.
(3)  Exclusive of accrued interest and distributions, if any.
(4)  Includes the rights of holders of Preferred Securities under the 
     Guarantee of Preferred Securities and back-up undertakings, consisting of 
     obligations by Public Service Company of Colorado as set forth in the 
     Amended and Restated Declaration of Trust of PSCO Capital Trust I, the 
     Subordinated Debt Securities Indenture (as defined below) and Supplemental
     Indentures thereto, in each case as further described in the Registration 
     Statement.  No separate consideration will be received for the Guarantee 
     or any back-up undertakings.

THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR 
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS 
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS 
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH 
SECTION 8(a) OF THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE 
REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES 
AND EXCHANGE COMMISSION, ACTING PURSUANT TO SECTION 8(a), MAY DETERMINE.

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

Information contained herein is subject to completion or amendment.  A
registration statement to these securities has been filed with the Securities
and Exchange Commission.  These securities may not be sold nor may offers to buy
be accepted prior to the time the registration statement becomes effective. 
This prospectus shall not constitute an offer to sell or the solicitation of any
offer to buy nor shall there be any sale of these securities in any state in
which such offer, solicitation or sale would be unlawful prior to registration
or qualification under the securities laws of any such state. 

<PAGE>

SUBJECT TO COMPLETION, DATED               , 1998

PROSPECTUS
                                       
                                 $450,000,000
                                       
                                 [PSCO LOGO]
                                       
                         FIRST COLLATERAL TRUST BONDS
                            SENIOR DEBT SECURITIES
                         SUBORDINATED DEBT SECURITIES

                             --------------------
                                          
                             PSCO CAPITAL TRUST I
                             PREFERRED SECURITIES
                    FULLY AND UNCONDITIONALLY GUARANTEED,
                            AS DESCRIBED HEREIN, BY
                      PUBLIC SERVICE COMPANY OF COLORADO

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

          Public Service Company of Colorado, a Colorado corporation (the 
"Company"), may offer, from time to time, (i) first collateral trust bonds, 
which may include medium term notes (the "New Bonds"), (ii) unsecured senior 
debt securities consisting of debentures, notes and/or other evidences of 
indebtedness representing unsecured obligations of the Company (the "Senior 
Debt Securities"), or (iii) unsecured subordinated debt securities consisting 
of debentures, notes and/or other evidences of indebtedness representing 
unsecured obligations of the Company (the "Subordinated Debt Securities", 
together with the Senior Debt Securities, the "Debt Securities"), in each 
case in one or more series, and in amounts, at prices and on terms to be 
determined at or prior to the time or times of sale.

          PSCO Capital Trust I (the "Trust"), a statutory business trust 
formed under the laws of the State of Delaware, may offer a single series of 
its preferred securities representing undivided beneficial interests in the 
assets of the Trust ("Preferred Securities") in an amount and at the price 
and terms to be determined at or prior to the time of sale.  The Company will 
be the owner of beneficial interests represented by the common securities of 
the Trust (the "Common Securities", together with the Preferred Securities, 
the "Trust Securities").  The payment of periodic cash distributions 
("Distributions") with respect to the Preferred Securities out of moneys held 
by the Trust, and payment upon liquidation, redemption or otherwise with 
respect to such Preferred Securities, will be guaranteed by the Company to 
the extent described herein (the "Preferred Securities Guarantee").  See 
"Description of the Preferred Securities Guarantee" below.  The Company's 
obligations under the Preferred Securities Guarantee are subordinate and 
junior in right of payment to all other liabilities of the Company and rank 
PARI PASSU with the most senior preferred stock, if any, now outstanding or 
issued from time to time by the Company.  The Company's Subordinated Debt 
Securities may be issued from time to time in one or more series directly or 
may be issued and sold to the Trust, or a trustee of the Trust, in connection 
with the investment of the proceeds from the offering of Preferred Securities 
and Common Securities (as defined herein) of the Trust. Subordinated Debt 
Securities purchased by the Trust may subsequently be distributed pro rata to 
the holders of Preferred Securities and Common Securities in connection with 
the dissolution of the Trust.

          The New Bonds, Senior Debt Securities, Subordinated Debt Securities 
and Preferred Securities together with the related Preferred Securities 
Guarantee are collectively referred to as the "Offered Securities".

<PAGE>

          Certain specific terms of the Offered Securities in respect of 
which this Prospectus is being delivered will be set forth in an accompanying 
Prospectus Supplement or Supplements, together with the terms of the 
particular Offered Securities being offered by such Prospectus Supplement or 
Supplements, the initial price thereof and the net proceeds from the sale 
thereof.  The Prospectus Supplement will set forth with regard to the 
particular Offered Securities, without limitation and where applicable, the 
following: (i) in the case of the New Bonds, the designation, aggregate 
principal amount, maturity date or dates, interest rate or rates and times of 
payment of interest, the terms of any redemption provisions, the purchase 
price and any other specific terms of the offering, (ii) in the case of the 
Debt Securities, the designation, aggregate principal amount, denominations, 
maturity date or dates, premium, if any, terms of subordination, if any, and 
exchange, conversions, redemption or sinking fund provisions, interest 
payment dates, interest rate or rates (which may be fixed or variable) or 
method of calculating interest, currency or currency units in which principal 
of, premium, if any, and interest will be payable, purchase price, any 
listing on a securities exchange, any right of the Company to defer payment 
of interest and the maximum length of such deferral period and any other 
specific terms of the offering and (iii) in the case of the Preferred 
Securities, the specific title, aggregate amount, number of securities, 
stated liquidation preference per security, purchase price, any listing on a 
securities exchange, dividend rate (or method of calculation thereof), dates 
on which dividends shall be payable and dates from which dividends shall 
accrue, any voting rights, any redemption, exchange or sinking fund 
provisions, any other rights, preferences, privileges, limitations or 
restrictions relating to the Preferred Securities and the terms upon which 
the proceeds of the Preferred Securities shall be used to purchase a specific 
series of Subordinated Debt Securities of the Company.

          The Offered Securities may be sold to or through underwriters, 
through dealers or agents, directly to purchasers or through a combination of 
such methods.  See "Plan of Distribution".  The names of any underwriters, 
dealers or agents involved in the sale of the Offered Securities in respect 
of which this Prospectus is being delivered and any applicable fee, 
commission or discount arrangements with them will be set forth in the 
related Prospectus Supplement. See "Plan of Distribution" for possible 
indemnification arrangements for dealers, underwriters and agents.

                             --------------------
                                       
        THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
          SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
                COMMISSION NOR HAS THE SECURITIES AND EXCHANGE
                COMMISSION OR ANY STATE SECURITIES COMMISSION
                   PASSED UPON THE ACCURACY OR ADEQUACY OF
                   THIS PROSPECTUS.  ANY REPRESENTATION TO
                     THE CONTRARY IS A CRIMINAL OFFENSE.

                             --------------------
                                          
           The date of this Prospectus is                 , 1998.

                                      -2-

<PAGE>
                                       
                             AVAILABLE INFORMATION

     The Company is subject to the informational requirements of the 
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in 
accordance therewith files reports and other information with the Securities 
and Exchange Commission (the "SEC") and the New York Stock Exchange.  Such 
reports and other information can be inspected and copied at the public 
reference facilities maintained by the SEC at Room 1024, Judiciary Plaza, 450 
Fifth Street, N.W., Washington, D.C., and at the following regional offices 
of the SEC: New York Regional Office, 13th Floor, Seven World Trade Center, 
New York, New York and Chicago Regional Office, 14th Floor, 500 West Madison 
Street, Chicago, Illinois. Copies of such materials can also be obtained at 
prescribed rates from the Public Reference Section of the SEC at its 
principal office at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 
20549.  Such material is also available from the SEC's Web site at 
"http://www.sec.gov".  Certain of the Company's securities are listed on the 
New York Stock Exchange and such reports and other information can also be 
inspected and copied at the office of such exchange on the 7th Floor, 20 
Broad Street, New York, New York.

     This Prospectus constitutes a part of a Registration Statement on Form 
S-3 (together with all amendments and exhibits thereto, the "Registration 
Statement") filed by the Company and the Trust with the SEC under the 
Securities Act of 1933, as amended (the "Securities Act"), with respect to 
the Offered Securities.  This Prospectus does not contain all of the 
information set forth in such Registration Statement, certain parts of which 
are omitted in accordance with the rules and regulations of the SEC.  
Reference is made to such Registration Statement and to the exhibits relating 
thereto for further information with respect to the Company, the Trust, and 
the Offered Securities.  Any statements contained herein concerning the 
provisions of any document filed as an exhibit to the Registration Statement 
or otherwise filed with the SEC or incorporated by reference herein are not 
necessarily complete, and in each instance reference is made to the copy of 
such document so filed for a more complete description of the matter 
involved.  Each such statement is qualified in its entirety by such reference.

     No separate financial statements of the Trust have been included or 
incorporated by reference herein.  The Company does not consider that such 
financial statements would be material to holders of the Preferred Securities 
because (i) all of the voting securities of the Trust will be owned, directly 
or indirectly, by the Company, a reporting company under the Exchange Act, 
(ii) the Trust has no independent operations but exists for the sole purpose 
of issuing securities representing undivided beneficial interests in the 
assets of the Trust and investing the proceeds thereof in Subordinated Debt 
Securities issued by the Company and (iii) the Company's obligations 
described herein and in any accompanying Prospectus Supplement under the 
Declaration of Trust of the Trust, the Preferred Securities Guarantee, the 
Subordinated Debt Securities purchased by the Trust and the related 
Indenture, taken together, constitute a full and unconditional guarantee of 
payments due on the Preferred Securities.  See "Description of the 
Subordinated Debt Securities" and "Description of the Preferred Securities 
Guarantee".

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The Company hereby incorporates herein by reference the following documents
which have been filed by the Company with the SEC pursuant to the Exchange Act:

     1.   The Company's Annual Report on Form 10-K for the year ended 
December 31, 1997 (included in the New Century Energies, Inc. combined Annual 
Report on Form 10-K for the year ended December 31, 1997).

     All documents filed by the Company with the SEC pursuant to Section 
13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of filing of the 
Registration Statement of which this Prospectus is a part and prior to the 
termination of the offering made hereby shall be deemed to be incorporated 
herein by reference and to be a part hereof from the respective dates of 
filing thereof.  The documents incorporated or deemed to be 

                                      -3-
<PAGE>

incorporated herein by reference are sometimes hereinafter called the 
"Incorporated Documents".  Any statement contained herein or in an 
Incorporated Document shall be deemed to be modified or superseded for all 
purposes to the extent that a statement contained herein or in any Prospectus 
Supplement or in any subsequently filed Incorporated Document modifies or 
supersedes such statement.  Any statement so modified or superseded shall not 
be deemed, except as so modified or superseded, to constitute a part of this 
Prospectus or any Prospectus Supplement.

     THE COMPANY WILL PROVIDE WITHOUT CHARGE TO EACH PERSON TO WHOM THIS 
PROSPECTUS IS DELIVERED, UPON THE REQUEST OF ANY SUCH PERSON, A COPY OF ANY 
OR ALL OF THE INCORPORATED DOCUMENTS, EXCLUDING THE EXHIBITS THERETO UNLESS 
SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE INTO SUCH DOCUMENTS. 
REQUESTS FOR SUCH DOCUMENTS SHOULD BE DIRECTED TO BRIAN P. JACKSON, SENIOR 
VICE PRESIDENT AND CHIEF FINANCIAL OFFICER, BY MAIL TO PUBLIC SERVICE COMPANY 
OF COLORADO, SUITE 900, 1225 17TH STREET, DENVER, COLORADO 80202-5533, OR BY 
TELEPHONE AT (303) 571-7511.

     In addition to the historical information contained or incorporated by 
reference herein, this Prospectus contains or incorporates by reference a 
number of "forward-looking statements" within the meaning of the Exchange 
Act.  Such statements address future events and conditions concerning capital 
expenditures, resolution and impact of litigation, regulatory matters, 
liquidity and capital resources and accounting matters.  Actual results in 
each case could differ materially from those projected in such statements due 
to a variety of factors including, without limitation, restructuring of the 
utility industry; future economic conditions; earnings retention and dividend 
payout policies; developments in the legislative, regulatory and competitive 
environments in which the Company operates; and other circumstances that 
could affect anticipated revenues and costs, such as compliance with laws and 
regulations. These and other factors are discussed in the Company's filings 
with the SEC.









                                      -4-
<PAGE>

                                  THE COMPANY

     The Company, incorporated through merger of predecessors under the laws 
of the State of Colorado in 1924, is an operating public utility engaged 
principally in the generation, purchase, transmission, distribution and sale 
of electricity and in the purchase, transmission, distribution, sale and 
transportation of natural gas, with the Company's principal distribution 
center being the Denver metropolitan area.  The Company's executive offices 
are located at 1225 17th Street, Denver, Colorado 80202-5533, where the 
telephone number is (303) 571-7511.

     On August 1, 1997, the Company and Southwestern Public Service Company 
consummated a business combination and each became a wholly-owned subsidiary 
of New Century Energies, Inc. ("NCE"), a registered holding company under the 
Public Utility Holding Company Act of 1935.  The transaction has been 
accounted for as a pooling of interests for accounting purposes.  As a result 
of the transaction, NCE directly owns the following subsidiaries which 
previously had been directly owned by the Company:  Cheyenne Light, Fuel and 
Power Company and WestGas InterState, Inc.  The Company directly owns the 
following subsidiaries: PS Colorado Credit Corporation ("PSCCC"), PSR 
Investments, Inc., 1480 Welton, Inc., Fuel Resources Development Co., a 
dissolved corporation, and New Century International, Inc., which was 
established in 1997 in connection with the Company's investment in Yorkshire 
Power Group, plc.  The Company intends to transfer the capital stock of PSCCC 
to NCE after receipt of regulatory and other approvals.  NC Enterprises, 
Inc., a wholly-owned subsidiary of NCE, directly owns the following 
subsidiaries which previously had been directly owned by the Company:  e 
prime, inc. and Natural Fuels Corporation.  The Company intends that New 
Century International, Inc., will be transferred to and become a wholly-owned 
subsidiary of NC Enterprises, Inc. following receipt of appropriate 
regulatory approval.

                                  THE TRUST

     The Trust is a statutory business trust formed under Delaware law 
pursuant to (i) a declaration of trust (as such declaration will be amended 
and restated substantially as set forth in the form attached to the 
Registration Statement of which this Prospectus is a part, the "Declaration") 
executed by the Company as depositor for the Trust (the "Depositor"), and the 
PSCO Trustees (as defined herein) of such trust and (ii) the filing of a 
certificate of trust with the Secretary of State of the State of Delaware.  
The Trust exists for the exclusive purposes of (i) issuing and selling the 
Preferred Securities and the Common Securities, (ii) using the gross proceeds 
from the sale of the Trust Securities to acquire a corresponding series of 
Subordinated Debt Securities of the Company and (iii) maintaining the status 
of the Trust as a grantor trust for federal income tax purposes and engaging 
in only those other activities necessary, appropriate, convenient or 
incidental to the foregoing.  All of the Common Securities will be directly 
or indirectly owned by the Company.  The Common Securities will rank PARI 
PASSU, and payments will be made thereon pro rata, with the Preferred 
Securities, except that upon the occurrence and continuance of an event of 
default with respect to the corresponding series of Subordinated Debt 
Securities of the Company, the rights of the holders of the Common Securities 
to payment of cash distributions and payments upon redemption, liquidation or 
otherwise will be subordinated to the rights of the holders of the Preferred 
Securities.  The Company will directly or indirectly acquire Common 
Securities in an aggregate liquidation amount equal to at least 3% of the 
total capital of the Trust.

     The Trust's business and affairs are conducted by three trustees, each 
appointed by the Company in its capacity as holder of the Common Securities: 
(i) The Bank of New York (the "Property Trustee"); (ii) The Bank of New York 
(Delaware) (the "Delaware Trustee"); and (iii) one individual trustee who is 
an employee or officer of or affiliated with the Company (the "Administrative 
Trustee", and collectively with the Property Trustee and the Delaware 
Trustee, the "PSCO Trustees").  The holder of the Common Securities, or the 
holders of at least a majority in aggregate liquidation amount of the Trust's 
Preferred Securities if an event of default under the Declaration has 
occurred and is continuing (a "Declaration Event of Default"), will be 
entitled to remove and replace the Property Trustee and the Delaware Trustee. 
In no event will the holders of the Preferred Securities have the right to 
vote to appoint, remove or replace the Administrative Trustee, which 

                                      -5-
<PAGE>

voting rights are vested exclusively in the holder of the Common Securities.  
The duties and obligations of each of the PSCO Trustees are governed by the 
Declaration.

     The Company will pay all fees and expenses related to the Trust and the 
offering of its Preferred Securities and will pay, directly or indirectly, 
all ongoing costs, expenses and liabilities of the Trust except the Trust's 
obligations under its Trust Securities.

The principal place of business of the Trust shall be c/o Public Service 
Company of Colorado, 1225 17th Street, Suite 900, Denver, Colorado 
80202-5533, where the telephone number is (303) 571-7511.

                      RATIO OF CONSOLIDATED EARNINGS TO
                          CONSOLIDATED FIXED CHARGES

<TABLE>
                                                 Twelve Months Ended
                                                     December 31,

                                        1993     1994    1995    1996     1997
                                        --------------------------------------
<S>                                     <C>      <C>     <C>     <C>      <C>
Ratio of consolidated earnings
to consolidated fixed charges           2.54     2.53    2.78    2.75     2.49
</TABLE>

     The ratio for future periods will be included in the Company's annual 
and quarterly reports filed pursuant to the Exchange Act.  Such reports are 
incorporated by reference into this Prospectus at the time they are filed.

                            APPLICATION OF PROCEEDS

     Unless otherwise indicated in the accompanying Prospectus Supplement, 
the Company intends to use the net proceeds from the sale of any of the New 
Bonds or Debt Securities offered hereby (i) to refinance short-term and other 
debt, (ii) to repurchase or redeem outstanding preferred stock of the 
Company and (iii) for general corporate purposes.  Any specific allocation 
of the proceeds to a particular purpose that has been made at the date of any 
Prospectus Supplement will be described therein.  The Trust will use the 
proceeds from the sale of its Preferred Securities to purchase Subordinated 
Debt Securities of the Company.

                          DESCRIPTION OF THE NEW BONDS

     GENERAL:  The New Bonds will be issued in one or more series as fully 
registered bonds, without coupons, under an Indenture, dated as of October 1, 
1993 (the "Original 1993 Mortgage"), between the Company and First Trust of 
New York, National Association, as successor trustee (together with any 
further successor thereto, the "1993 Mortgage Trustee").  The Original 1993 
Mortgage, as supplemented and to be supplemented by various supplemental 
indentures, including one or more supplemental indentures relating to the New 
Bonds, is hereinafter referred to as the "1993 Mortgage".  The summaries 
under this heading do not purport to be complete and are subject to, and 
qualified in their entirety by, the detailed provisions of the 1993 Mortgage. 
Capitalized terms used under this heading which are not otherwise defined 
hereunder shall have the meanings ascribed thereto in the 1993 Mortgage.  
Wherever particular provisions of the 1993 Mortgage or terms defined therein 
are referred to, such provisions or definitions are incorporated by reference 
as a part of the statements made herein and such statements are qualified in 
their entirety by such reference. References to article and section numbers 
herein, unless otherwise indicated, are references to article and section 
numbers of the Original 1993 Mortgage.

     The 1993 Mortgage provides that, in addition to the New Bonds, other 
debt securities may be issued thereunder, without limitation as to the 
aggregate principal amount, on the basis of Class A Bonds (as hereinafter 
defined), property additions, retired Mortgage Securities (as hereinafter 
defined) and cash.  See 

                                      -6-
<PAGE>

"Issuance of Additional Mortgage Securities".  The New Bonds and all other 
debt securities heretofore or hereafter issued under the 1993 Mortgage are 
collectively referred to herein as the "Mortgage Securities" or the "Bonds".

     Reference is made to the Prospectus Supplement and any supplement 
thereto for a description of the following terms of the series of New Bonds 
in respect of which this Prospectus is being delivered:  (i) the title of 
such New Bonds; (ii) the aggregate principal amount of such New Bonds; (iii) 
the price (expressed as a percentage of principal amount) at which such New 
Bonds will be issued; (iv) the date or dates on which the principal of such 
New Bonds is payable; (v) the rate or rates at which such New Bonds will bear 
interest, if any, the date or dates from which such interest will accrue, the 
dates on which such interest will be payable ("Interest Payment Dates"), and 
the regular record dates for the interest payable on such Interest Payment 
Dates; (vi) the option, if any, of the Company to redeem such New Bonds and 
the period or periods within which, or the date or dates on which, the prices 
at which and the terms and conditions upon which, such New Bonds may be 
redeemed, in whole or in part, upon the exercise of such option; (vii) the 
obligation, if any, of the Company to redeem or purchase such New Bonds at 
the option of the registered holder or pursuant to any sinking fund or 
analogous provisions and the period or periods within which, or the date or 
dates on which, the price or prices at which and the terms and conditions 
upon which such New Bonds will be redeemed or purchased, in whole or in part, 
pursuant to such obligation; (viii) the denominations in which such New Bonds 
will be issuable, if other than $1,000 and integral multiples thereof; (ix) 
whether such New Bonds are to be issued in whole or in part in book-entry 
form and represented by one or more global New Bonds and, if so, the identity 
of the depository for such global New Bonds and the specific terms of the 
depository arrangements therefor; and (x) any other terms of such New Bonds, 
including with respect to any series, if applicable, any consents to 
modifications or waivers of covenants contained in the 1993 Mortgage or the 
1939 Mortgage (as defined below).

     PAYMENT OF BONDS; TRANSFERS; EXCHANGES: Except as may be provided in the 
applicable Prospectus Supplement or any supplement thereto, interest, if any, 
on each Bond payable on each Interest Payment Date will be paid to the person 
in whose name such Bond is registered (the registered holder of any Mortgage 
Security being hereinafter called a "Holder") as of the close of business on 
the regular record date relating to such Interest Payment Date; provided, 
however, that interest payable at maturity (whether at stated maturity, upon 
redemption or otherwise, hereinafter "Maturity") will be paid to the person 
to whom principal is paid at Maturity.  However, if there has been a default 
in the payment of interest on any Bond, such defaulted interest may be 
payable to the Holder of such Bond as of the close of business on a date 
selected by the 1993 Mortgage Trustee which is not more than 30 days and not 
less than 10 days prior to the date proposed by the Company for payment of 
such defaulted interest or in any other lawful manner not inconsistent with 
the requirements of any securities exchange on which such Bond may be listed, 
if the 1993 Mortgage Trustee deems such manner of payment practicable.  (See 
Section 307.)

     Unless otherwise specified in a Prospectus Supplement or supplement 
thereto, the principal of and premium, if any, and interest on the Bonds at 
Maturity will be payable upon presentation of the Bonds at the corporate 
trust office of First Trust of New York, National Association, in New York, 
New York, as Paying Agent for the Company.  The Company may change the Place 
of Payment on the Bonds, may appoint one or more additional Paying Agents 
(including the Company) and may remove any Paying Agent, all at its 
discretion.  (See Section 602 and Article One of the Supplemental Indenture(s) 
relating to the New Bonds.)

     Unless otherwise specified in a Prospectus Supplement or supplement 
thereto, the transfer of Bonds may be registered, and Bonds may be exchanged 
for other Bonds of the same series and tranche, of authorized denominations 
and of like tenor and aggregate principal amount, at the corporate trust 
office of First Trust of New York, National Association, in New York, New 
York, as Security Registrar for the Bonds.  The Company may change the place 
for registration of transfer and exchange of the Bonds, and may designate one 
or more additional places for such registration and exchange, all at its 
discretion. (See Section 602.)  Except as otherwise provided in the 
applicable Prospectus Supplement or a supplement thereto, no service charge 
will be 

                                      -7-
<PAGE>

made for any transfer or exchange of the Bonds, 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 the Bonds.  The Company will not be required to execute or to 
provide for the registration of transfer of or the exchange of (a) any Bond 
during a period of 15 days prior to giving any notice of redemption or (b) 
any Bond selected for redemption in whole or in part, except the unredeemed 
portion of any Bond being redeemed in part. (See Section 305.)

     REDEMPTION:  Any terms for the optional or mandatory redemption of New 
Bonds will be set forth in the Prospectus Supplement or a supplement thereto. 
Except as shall otherwise be provided in the applicable Prospectus Supplement 
or a supplement thereto with respect to Bonds redeemable at the option of the 
Holder, Bonds will be redeemable only upon notice by mail not less than 30 
nor more than 60 days prior to the date fixed for redemption, and, if less 
than all the Bonds of a series, or any tranche thereof, are to be redeemed, 
the particular Bonds to be redeemed will be selected by such method as shall 
be provided for any particular series, or in the absence of any such 
provision, by such method of random selection as the Security Registrar deems 
fair and appropriate.  (See Sections 503 and 504.)

     Any notice of redemption at the option of the Company may state that 
such redemption will be conditional upon receipt by the Paying Agent or 
Agents, on or prior to the date fixed for such redemption, of money 
sufficient to pay the principal of and premium, if any, and interest, if any, 
on such Bonds and that if such money has not been so received, such notice 
will be of no force and effect and the Company will not be required to redeem 
such Bonds. (See Section 504.)

     While the Original 1993 Mortgage contains provisions for the maintenance 
of the Mortgaged Property, it does not contain any provisions for a 
maintenance or sinking fund and, except as may be provided in the applicable 
Prospectus Supplement or a supplement thereto, there will be no provisions 
for any such funds for the New Bonds.

     SECURITY:  GENERAL.  Except as discussed under this heading and under 
"Issuance of Additional Mortgage Securities" below, all Mortgage Securities 
now or hereafter issued under the 1993 Mortgage will be secured, equally and 
ratably, primarily by

          (a)  an equal principal amount of first mortgage bonds (which need 
     not bear interest) issued under the Company's Indenture, dated as of 
     December 1, 1939 (the "Original 1939 Mortgage"), between the Company and 
     First Trust of New York, National Association, as successor trustee 
     (together with any further successor thereto, the "1939 Mortgage 
     Trustee"), and delivered to the Trustee under the 1993 Mortgage (the 
     Original 1939 Mortgage, as amended and supplemented, being hereinafter 
     called the "1939 Mortgage").  As discussed under "DESCRIPTION OF THE 1939 
     MORTGAGE--Security", the 1939 Mortgage constitutes, subject to certain
     exceptions, a first mortgage lien on substantially all properties of the
     Company; and

          (b)  the lien of the 1993 Mortgage on substantially all of the
     Company's properties used or to be used in or in connection with the
     business of generating, purchasing, transmitting, distributing and/or
     selling electric energy (the "Electric Utility Business"), which lien is
     junior to the lien of the 1939 Mortgage.

     As discussed below under "Class A Bonds", following a merger or 
consolidation of another corporation into the Company or the transfer to the 
Company of property subject to the lien of an existing mortgage and the 
assumption by the Company of all the obligations of the mortgagor under such 
mortgage, the Company could deliver to the 1993 Mortgage Trustee bonds issued 
under a mortgage existing on the properties acquired in such transaction in 
lieu of or in addition to bonds issued under the 1939 Mortgage.  In such 
event, the Mortgage Securities would be secured, additionally, by such bonds 
and by the lien of the 1993 Mortgage on such properties, which would be 
junior to the liens of such existing mortgage and the 1939 Mortgage on 

                                      -8-
<PAGE>

such properties.  The 1939 Mortgage and all such other mortgages are 
hereinafter collectively referred to as "Class A Mortgages", and all bonds 
issued under the Class A Mortgages and delivered to the 1993 Mortgage Trustee 
are hereinafter collectively referred to as "Class A Bonds".  If and when no 
Class A Mortgages are in effect, the 1993 Mortgage will constitute a first 
mortgage lien on all property of the Company subject thereto, subject to 
certain Permitted Liens (as discussed below under "Lien of the 1993 
Mortgage").  As discussed below under "Class A Bonds", at the date of this 
Prospectus the only Class A Mortgage is the 1939 Mortgage.  The Company 
currently believes that it is possible that prior to the Stated Maturity of 
the New Bonds, all Class A Bonds outstanding under the 1939 Mortgage, other 
than Class A Bonds delivered to and held by the 1993 Mortgage Trustee as the 
basis of authentication and delivery of Mortgage Securities, may have been 
paid, redeemed or otherwise retired and that, thereupon, the Class A Bonds 
issued under the 1939 Mortgage would be surrendered for cancellation and the 
1939 Mortgage would be discharged.  Upon discharge of the 1939 Mortgage and 
assuming no other Class A Mortgage exists at the time, the 1993 Mortgage 
would become a first mortgage lien on all property of the Company subject 
thereto, subject to certain Permitted Liens.

     CLASS A BONDS.  Class A Bonds issued as the basis for the authentication 
and delivery of Mortgage Securities will be issued and delivered to, and 
registered in the name of, the 1993 Mortgage Trustee or its nominee and will 
be owned and held by the 1993 Mortgage Trustee, subject to the provisions of 
the 1993 Mortgage, for the benefit of the Holders of all Mortgage Securities 
Outstanding from time to time, and the Company will have no interest in such 
Class A Bonds.  Class A Bonds issued as the basis of authentication and 
delivery of Mortgage Securities (a) will mature or be subject to mandatory 
redemption on the same dates, and in the same principal amounts, as such 
Mortgage Securities and (b) will contain, in addition to any mandatory 
redemption provisions applicable to all Class A Bonds Outstanding under the 
related Class A Mortgage, mandatory redemption provisions correlative to 
provisions for mandatory redemption of such Mortgage Securities (pursuant to 
a sinking fund or otherwise), or for redemption at the option of the Holder 
of such Mortgage Securities.  Class A Bonds issued as the basis for 
authentication and delivery of a series or tranche of Mortgage Securities (x) 
may, but need not, bear interest, any such interest to be payable at the same 
times as interest on the Mortgage Securities of such series or tranche and 
(y) may, but need not, contain provisions for the redemption thereof at the 
option of the Company, any such redemption to be made at a redemption price 
or prices not less than the principal amount of such Class A Bonds.  (See 
Sections 402 and 701.)  To the extent that Class A Bonds issued as the basis 
for the authentication and delivery of New Bonds do not bear interest, 
holders of Mortgage Securities will not have the benefit of the lien of the 
1939 Mortgage in respect of an amount equal to accrued interest, if any, on 
such New Bonds; however, such holders will nevertheless have the benefit of 
the lien of the 1993 Mortgage in respect of such amount.

     Any payment by the Company of principal of, or premium or interest on, 
the Class A Bonds held by the 1993 Mortgage Trustee will be applied by the 
1993 Mortgage Trustee to the payment of any principal, premium or interest, 
as the case may be, in respect of the Mortgage Securities which is then due 
and, to the extent of such application, the obligation of the Company under 
the 1993 Mortgage to make such payment in respect of the Mortgage Securities 
will be deemed satisfied and discharged.  If, at the time of any such payment 
of principal of Class A Bonds, there shall be no principal then due in 
respect of the Mortgage Securities, such payment in respect of the Class A 
Bonds will be deemed to constitute Funded Cash and will be held by the 1993 
Mortgage Trustee as part of the Mortgaged Property, to be withdrawn, used or 
applied as provided in the 1993 Mortgage; and thereafter the Mortgage 
Securities authenticated and delivered on the basis of such Class A Bonds 
will, to the extent of such payment of principal, be deemed to have been 
authenticated and delivered on the basis of the deposit of cash.  If, at the 
time of any such payment of premium or interest on Class A Bonds, there shall 
be no premium or interest, as the case may be, then due in respect of the 
Mortgage Securities, such payment will be remitted to the Company at its 
request; provided, however, that if an Event of Default, as described below, 
shall have occurred and be continuing, such payment shall be held as part of 
the Mortgaged Property until such Event of Default shall have been cured or 
waived.  (See Section 702 and "Withdrawal of Cash" below.)  Any payment by 
the Company of principal of, or premium or interest on, Mortgage Securities 
authenticated and delivered on the basis of the issuance and delivery to the 
1993 Mortgage Trustee of Class A Bonds (other than by application of the 
proceeds of a payment in respect of such Class A 

                                      -9-
<PAGE>

Bonds) will, to the extent thereof, be deemed to satisfy and discharge the 
obligation of the Company, if any, to make a payment of principal, premium or 
interest, as the case may be, in respect of such Class A Bonds which is then 
due.  (See Section 702 and Article One of the Supplemental Indenture(s) to 
the 1939 Mortgage creating the Class A Bonds to be delivered in connection 
with the issuance of the New Bonds.)

     The 1993 Mortgage Trustee may not sell, assign or otherwise transfer any 
Class A Bonds except to a successor trustee under the 1993 Mortgage.  (See 
Section 704.)  At the time any Mortgage Securities of any series or tranche 
which have been authenticated and delivered upon the basis of the issuance 
and delivery to the 1993 Mortgage Trustee of Class A Bonds, cease to be 
Outstanding (other than as a result of the application of the proceeds of the 
payment or redemption of such Class A Bonds) the 1993 Mortgage Trustee will 
surrender to or upon the order of the Company an equal principal amount of 
such Class A Bonds. (See Section 703.)

     At the date of this Prospectus, the only Class A Mortgage is the 1939 
Mortgage and the only Class A Bonds issuable at this time are first mortgage 
bonds issuable thereunder.  The 1993 Mortgage provides that, in the event 
that a corporation which was a mortgagor under a mortgage shall have merged 
into or consolidated with the Company, or shall have conveyed or otherwise 
transferred property to the Company subject to the lien of such a mortgage 
and the Company shall have assumed all the obligations of the mortgagor 
thereunder, and in either case such mortgage constitutes a lien on properties 
of such other corporation or on such transferred properties, as the case may 
be, prior to the lien of the 1993 Mortgage, such existing mortgage may be 
designated by the Company as an additional Class A Mortgage.  Bonds 
thereafter issued under such additional mortgage would be Class A Bonds and 
could provide the basis for the authentication and delivery of Mortgage 
Securities under the 1993 Mortgage. (See Section 706.)  When no Class A Bonds 
are Outstanding under a Class A Mortgage except for Class A Bonds held by the 
1993 Mortgage Trustee, then, at the request of the Company and subject to 
satisfaction of certain conditions, the 1993 Mortgage Trustee will surrender 
such Class A Bonds for cancellation and the related Class A Mortgage will be 
satisfied and discharged, the lien of such Class A Mortgage on the Company's 
property will cease to exist and the priority of the lien of the 1993 
Mortgage will be increased accordingly.  (See Section 707.)

     The 1993 Mortgage contains no restrictions on the issuance of Class A 
Bonds in addition to Class A Bonds issued to the 1993 Mortgage Trustee as the 
basis for the authentication and delivery of Mortgage Securities.  Class A 
Bonds may currently be issued under the 1939 Mortgage on the basis of 
property additions, retirements of bonds previously issued under the 1939 
Mortgage and cash deposited with the 1939 Mortgage Trustee.  See "DESCRIPTION 
OF THE 1939 MORTGAGE--Issuance of Additional Bonds Under the 1939 Mortgage".

     LIEN OF THE 1993 MORTGAGE.  In the opinion of LeBoeuf, Lamb, Greene & 
MacRae, L.L.P., based on information obtained from public records and from 
the Company, the 1993 Mortgage constitutes a mortgage lien on the property 
specifically or generally described or referred to therein as subject to the 
lien thereof, except such property as may have been disposed of or released 
from the lien thereof in accordance with the terms thereof, subject to no 
liens prior to the lien of the 1993 Mortgage other than the lien of the 1939 
Mortgage (so long as the 1939 Mortgage remains in effect), the liens of any 
other Class A Mortgages and Permitted Liens; and the 1993 Mortgage 
effectively subjects to the lien thereof property (other than excepted 
property) acquired by the Company after the date of the execution and 
delivery thereof to the extent, and subject to the qualifications, 
hereinafter described.  So long as such 1939 Mortgage is in effect, the Bonds 
will have the benefit of the first mortgage lien of the 1939 Mortgage on such 
property, and the benefit of the prior lien of any additional Class A 
Mortgage on any property subject thereto, to the extent of the aggregate 
principal amount of Class A Bonds issued under the respective Class A 
Mortgages and held by the 1993 Mortgage Trustee for the benefit of holders of 
First Collateral Trust Bonds, including the New Bonds.  The properties 
subject to the lien of the 1993 Mortgage, whether currently owned or 
hereafter acquired, are the Company's properties used or to be used in or in 
connection with the Electric Utility Business (whether or not 

                                     -10-
<PAGE>

such is the sole use of such properties).  Properties relating to the 
Company's gas and steam businesses are not subject to the lien of the 1993 
Mortgage.

     The lien of the 1993 Mortgage is subject to Permitted Liens which 
include tax liens and other governmental charges which are not delinquent or 
which are being contested in good faith; certain workmen's, materialmen's and 
other liens; certain judgment liens and attachments; certain easements, 
leases, reservations or other rights of others (including governmental 
entities) in, on, over, and/or across, and laws, regulations and restrictions 
affecting, and defects, irregularities, exceptions and limitations in title 
to, certain property of the Company; certain leasehold interests; certain 
rights and interests of others which relate to common ownership or joint use 
of property and liens on the interests of others in such property; certain 
non-exclusive rights and interests retained by the Company with respect to 
property used or to be used in or in connection with both the businesses in 
which the Mortgaged Property is used and any other businesses; and certain 
other liens and encumbrances.  (See Granting Clauses and Section 101.)

     There are excepted from the lien of the 1993 Mortgage, among other 
things, cash and securities not paid or delivered to, deposited with or held 
by the 1993 Mortgage Trustee under the 1993 Mortgage; contracts, leases and 
other agreements of whatsoever kinds, contract rights, bills, notes and other 
instruments, accounts receivable, claims, governmental and other permits, 
allowances and franchises, certain intellectual property rights and other 
intangibles; automobiles, other vehicles, movable equipment and aircraft; 
goods, stock in trade, wares and merchandise held for sale or lease in the 
ordinary course of business; materials, supplies and other personal property 
consumable in the operation of the Mortgaged Property; fuel, including 
nuclear fuel, whether or not consumable in the operation of the Mortgaged 
Property; furniture and furnishings; computers, machinery and 
telecommunication and other equipment used exclusively for corporate 
administrative or clerical purposes; coal, ore, gas, oil and other minerals 
and timber, and rights and interests in any such minerals or timber, whether 
or not such minerals or timber have been mined or extracted or otherwise 
separated from the land; electric energy, gas (natural or artificial), steam, 
water and other products generated, produced, manufactured, purchased or 
otherwise acquired by the Company; leasehold interests held by the Company as 
lessee; and property that is located outside of the State of Colorado.  (See 
"Excepted Property".)

     Without the consent of the Holders, the Company and the 1993 Mortgage 
Trustee may enter into supplemental indentures in order to subject to the 
lien of the 1993 Mortgage additional property, whether or not used or to be 
used in or in connection with the Electric Utility Business (including 
property which would otherwise be excepted from such lien).  (See Section 
1401.)  Such property would thereupon constitute Property Additions (so long 
as it would otherwise qualify as Property Additions as described below) and 
be available as a basis for the issuance of Mortgage Securities.  See 
"Issuance of Additional Mortgage Securities".

     The 1993 Mortgage contains provisions subjecting to the lien thereof 
after-acquired property used or to be used in the Electric Utility Business, 
subject to the prior lien of the 1939 Mortgage (for as long as such prior 
lien is in effect).  These provisions are limited in the case of 
consolidation or merger (whether or not the Company is the surviving 
corporation) or transfer of the Mortgaged Property as, or substantially as, 
an entirety.  In the event of consolidation or merger or the transfer of the 
Mortgaged Property as or substantially as an entirety, the 1993 Mortgage will 
not be required to be a lien upon any of the properties then owned or 
thereafter acquired by the successor corporation except properties acquired 
from the Company in or as a result of such transaction and improvements, 
extensions and additions to such properties and renewals, replacements and 
substitutions of or for any part or parts of such properties.  (See Article 
Thirteen and "Consolidation, Merger, etc.")  In addition, after-acquired 
property may be subject to liens existing or placed thereon at the time of 
acquisition thereof, including, but not limited to, purchase money liens and 
the lien of any Class A Mortgage.

                                     -11-
<PAGE>

     The 1993 Mortgage provides that the 1993 Mortgage Trustee will have a lien,
prior to the lien on behalf of the holders of Mortgage Securities, upon the
Mortgaged Property for the payment of its reasonable compensation and expenses
and for indemnity against certain liabilities.  (See Section 1107.)

     ISSUANCE OF ADDITIONAL MORTGAGE SECURITIES:  The aggregate principal amount
of Mortgage Securities which may be authenticated and delivered under the 1993
Mortgage is unlimited.  (See Section 301.)  Mortgage Securities of any series
may be issued from time to time on the basis of, and in an aggregate principal
amount not exceeding:

          (a)  the aggregate principal amount of Class A Bonds issued and
     delivered to the 1993 Mortgage Trustee;

          (b)  70% of the Cost or Fair Value to the Company (whichever is less)
     of Property Additions (as described below) which do not constitute Funded
     Property (generally, Property Additions which have been (i) made the basis
     of the authentication and delivery of Mortgage Securities, the release of
     Mortgaged Property or cash withdrawals, (ii) substituted for retired
     property or (iii) used as the basis of a credit against, or otherwise in
     satisfaction of, any sinking, improvement, maintenance, replacement or
     similar fund, provided that Mortgage Securities of the series or tranche to
     which such fund relates remain Outstanding) after certain deductions and
     additions, primarily including adjustments to offset property retirements;

          (c)  the aggregate principal amount of Retired Securities (which
     consist of Mortgage Securities no longer outstanding under the 1993
     Mortgage which have not been used for certain other purposes under the 1993
     Mortgage and which have not been paid, redeemed or otherwise retired by the
     application of Funded Cash), but if Class A Bonds had been made the basis
     for the authentication and delivery of such Retired Securities, only if
     such Retired Securities became Retired Securities after the discharge of
     the related Class A Mortgage; and

          (d)  an amount of cash deposited with the 1993 Mortgage Trustee.

(See Article Four.)

     In general, the issuance of Mortgage Securities is subject to the Adjusted
Net Earnings of the Company for 12 consecutive months within the preceding 18
months being at least twice the Annual Interest Requirements on all Mortgage
Securities at the time outstanding, new Mortgage Securities then applied for,
all outstanding Class A Bonds other than Class A Bonds held by the 1993 Mortgage
Trustee under the 1993 Mortgage, and all other indebtedness (with certain
exceptions) secured by a lien prior to the lien of the 1993 Mortgage, except
that no such net earnings requirement need be met if the additional Mortgage
Securities to be issued are to have no Stated Interest Rate prior to Maturity. 
Adjusted Net Earnings are calculated before, among other things, provisions for
income taxes; depreciation or amortization of property; interest and
amortization of debt discount and expense; any non-recurring charge to income or
retained earnings of whatever kind or nature (including without limitation the
recognition of expense due to the non-recoverability of investment or expense),
whether or not recorded as a non-recurring item in the Company's books of
account; and any refund of revenues previously collected or accrued by the
Company subject to possible refund.  The calculation of Adjusted Net Earnings
also does not, or, in the case of losses or expense, is not required to, include
profits or losses from the sale or other disposition of property, or 
non-recurring items of revenue, income or expense of any kind or nature.  
(See Sections 103 and 401.)

     The Company is not required to satisfy the net earnings requirement prior
to issuance of Mortgage Securities (i) as provided in (a) above if the Class A
Bonds issued and delivered to the 1993 Mortgage Trustee as the basis for such
issuance have been authenticated and delivered under the related Class A
Mortgage on the basis of retired Class A Bonds or (ii) as provided in (c) above.
In general, the interest requirement with 


                                    -12-

<PAGE>

respect to variable interest rate indebtedness, if any, is determined with 
reference to the rate or rates in effect on the date immediately preceding 
such determination or the rate to be in effect upon initial authentication.  
With respect to Mortgage Securities of a series subject to a Periodic 
Offering (such as a medium-term note program), the 1993 Mortgage Trustee will 
be entitled to receive a certificate evidencing compliance with the net 
earnings requirements only once, at or prior to the time of the first 
authentication and delivery of the Mortgage Securities of such series. (See 
Article Four.)

     Property Additions generally include any property which is owned by the
Company and is subject to the lien of the 1993 Mortgage except (with certain
exceptions) goodwill, going concern value rights or intangible property, or any
property the cost of acquisition or construction of which is properly chargeable
to an operating expense account of the Company. (See Section 104.)

     Unless otherwise provided in the applicable Prospectus Supplement or a
supplement thereto, until the 1939 Mortgage has been discharged, the Company
will issue the New Bonds on the basis of Class A Bonds issued under its 1939
Mortgage.

     RELEASE OF PROPERTY:  Unless an Event of Default has occurred and is
continuing, the Company may obtain the release from the lien of the 1993
Mortgage of any Funded Property, except for cash held by the 1993 Mortgage
Trustee, upon delivery to the 1993 Mortgage Trustee of cash equal in amount to
the amount, if any, that the Cost of the property to be released (or, if less,
the Fair Value to the Company of such property at the time it became Funded
Property) exceeds the aggregate of:

          (a)  the aggregate principal amount, subject to certain limitations,
     of obligations delivered to the 1993 Mortgage Trustee which are secured by
     purchase money liens upon the property to be released;

          (b)  the Cost or Fair Value to the Company (whichever is less) of
     certified Property Additions not constituting Funded Property after certain
     deductions and additions, primarily including adjustments to offset
     property retirements (except that such adjustments need not be made if such
     Property Additions were acquired or made within the 90-day period preceding
     the release);

          (c)  an amount equal to 10/7ths of the principal amount of Mortgage
     Securities the Company would be entitled to issue on the basis of Retired
     Securities (with such entitlement to issue such principal amount of
     Mortgage Securities being waived by operation of such release);

          (d)  an amount equal to 10/7ths of the principal amount of Outstanding
     Mortgage Securities delivered to the 1993 Mortgage Trustee (with such
     Mortgage Securities to be cancelled by the 1993 Mortgage Trustee);

          (e)  an amount of cash and/or the aggregate principal amount, subject
     to certain limitations, of obligations secured by purchase money liens upon
     the property to be released, which in either case is evidenced to the 1993
     Mortgage Trustee by a certificate of the trustee or other holder of a lien
     prior to the lien of the 1993 Mortgage to have been received by such
     trustee or such other holder in accordance with the provisions of such lien
     in consideration for the release of such property or any part thereof from
     such lien; and


          (f)  any taxes and expenses incidental to any sale, exchange,
     dedication or other disposition of the property to be released.

          Property which is not Funded Property may generally be released from
     the lien of the 1993 Mortgage without depositing any cash or property with
     the 1993 Mortgage Trustee as long as (a) the aggregate amount of Cost or
     Fair Value to the Company (whichever is less) of all Property Additions


                                    -13-

<PAGE>

     which do not constitute Funded Property (excluding the property to be
     released) after certain deductions and additions, primarily including
     adjustments to offset property retirements, is not less than zero or (b)
     the Cost or Fair Value (whichever is less) of property to be released does
     not exceed the aggregate amount of the Cost or Fair Value to the Company
     (whichever is less) of Property Additions acquired or made within the 
     90-day period preceding the release.

     The 1993 Mortgage provides simplified procedures for the release of
property which has been released from the lien of a Class A Mortgage, minor
properties and property taken by eminent domain, and provides for dispositions
of certain obsolete property and grants or surrender of certain rights without
any release or consent by the 1993 Mortgage Trustee.

     If any property released from the lien of the 1993 Mortgage continues to be
owned by the Company after such release, the 1993 Mortgage will not become a
lien on any improvement, extension or addition to such property or renewals,
replacements or substitutions of or for any part or parts of such property. 
(See Article Eight.)

     WITHDRAWAL OF CASH:  Unless an Event of Default has occurred and is
continuing and subject to certain limitations, cash held by the 1993 Mortgage
Trustee may

          (a)  be withdrawn by the Company 

               (i)   to the extent of the Cost or Fair Value to the Company
          (whichever is less) of Property Additions not constituting Funded
          Property, after certain deductions and additions, primarily including
          adjustments to offset retirements (except that such adjustments need
          not be made if such Property Additions were acquired or made within
          the 90-day period preceding the release) or

               (ii)  in an amount equal to 10/7ths of the aggregate principal
          amount of Mortgage Securities that the Company would be entitled to
          issue on the basis of Retired Securities (with the entitlement to such
          issuance being waived by operation of such withdrawal) or

               (iii) in an amount equal to 10/7ths of the aggregate
          principal amount of any Outstanding Mortgage Securities delivered to
          the 1993 Mortgage Trustee, or

          (b)  upon the request of the Company, be applied to

               (i)   the purchase of Mortgage Securities (at prices not 
          exceeding 10/7ths of the principal amount thereof) or

               (ii)  the payment (or provision therefor for the satisfaction 
          and discharge of any Mortgage Securities) at Stated Maturity of any
          Mortgage Securities or the redemption (or similar provision therefor)
          of any Mortgage Securities which are redeemable (with any Mortgage
          Securities received by the 1993 Mortgage Trustee pursuant to these
          provisions being canceled by the 1993 Mortgage Trustee) (see Section
          806);

provided, however, that cash deposited with the 1993 Mortgage Trustee as the
basis for the authentication and delivery of Mortgage Securities, as well as
cash representing a payment of principal of Class A Bonds, may only be withdrawn
in an amount equal to the aggregate principal amount of Mortgage Securities the
Company would be entitled to issue on any basis (with the entitlement to such
issuance being waived by operation of such withdrawal), or may, upon the request
of the Company, be applied to the purchase, redemption or payment of Mortgage
Securities at prices not exceeding, in the aggregate, the principal amount
thereof.  (See Sections 405 and 702.)


                                    -14-

<PAGE>

     CONSOLIDATION, MERGER, ETC.:  The Company may not consolidate with or merge
into any other corporation or convey, otherwise transfer or lease the Mortgaged
Property as or substantially as an entirety to any Person unless (a) such
transaction is on such terms as will fully preserve the lien and security of the
1993 Mortgage and the rights and powers of the 1993 Mortgage Trustee and the
Holders; (b) the corporation formed by such consolidation or into which the
Company is merged or the Person which acquires by conveyance or other transfer,
or which leases, the Mortgaged Property as, or substantially as, an entirety is
a corporation organized and existing under the laws of the United States of
America or any State or Territory thereof or the District of Columbia, and such
corporation executes and delivers to the 1993 Mortgage Trustee a supplemental
indenture which contains an assumption by such corporation of the due and
punctual payment of the principal of and premium, if any, and interest, if any,
on the Mortgage Securities and the performance of all of the covenants and
conditions of the Company under the 1993 Mortgage and which contains a grant,
conveyance, transfer and mortgage by such corporation confirming the lien of the
1993 Mortgage on the Mortgaged Property and subjecting to such lien all property
thereafter acquired by such corporation which shall constitute an improvement,
extension or addition to the Mortgaged Property or a renewal, replacement or
substitution of or for any part thereof, and, at the election of such
corporation, subjecting to the lien of the 1993 Mortgage such other property
then owned or thereafter acquired by such corporation as such corporation shall
specify; and (c) in the case of a lease, such lease is made expressly subject to
termination by the Company or by the 1993 Mortgage Trustee at any time during
the continuance of an Event of Default.  (See Section 1301.)

     MODIFICATION OF 1993 MORTGAGE:  Without the consent of any Holders, the
Company and the 1993 Mortgage Trustee may enter into one or more supplemental
indentures for any of the following purposes:

          (a)  to evidence the succession of another Person to the Company and
     the assumption by any such successor of the covenants of the Company in the
     1993 Mortgage and in the Mortgage Securities; or

          (b)  to add one or more covenants of the Company or other provisions
     for the benefit of all Holders or for the benefit of the Holders of, or to
     remain in effect only so long as there shall be outstanding, Mortgage
     Securities of one or more specified series, or one or more tranches
     thereof, or to surrender any right or power conferred upon the Company by
     the 1993 Mortgage; or

          (c)  to correct or amplify the description of any property at any time
     subject to the lien of the 1993 Mortgage; or to better assure, convey and
     confirm to the 1993 Mortgage Trustee any property subject or required to be
     subjected to the lien of the 1993 Mortgage; or to subject to the lien of
     the 1993 Mortgage additional property (including property of others), to
     specify any additional Permitted Liens with respect to such additional
     property and to modify the provisions in the 1993 Mortgage for dispositions
     of certain types of property without release in order to specify any
     additional items with respect to such additional property; or

          (d)  to change or eliminate any provision of the 1993 Mortgage or to
     add any new provision to the 1993 Mortgage, provided that if such change,
     elimination or addition adversely affects the interests of the Holders of
     the Mortgage Securities of any series or tranche in any material respect,
     such change, elimination or addition will become effective with respect to
     such series or tranche only when no Mortgage Security of such series or
     tranche remains outstanding under the 1993 Mortgage; or

          (e)  to establish the form or terms of the Mortgage Securities of any
     series or tranche as permitted by the 1993 Mortgage; or

          (f)  to provide for the authentication and delivery of bearer
     securities and coupons appertaining thereto representing interest, if any,
     thereon and for the procedures for the registration, 


                                    -15-

<PAGE>

     exchange and replacement thereof and for the giving of notice to, and the 
     solicitation of the vote or consent of, the holders thereof, and for any 
     and all other matters incidental thereto; or

          (g)  to evidence and provide for the acceptance of appointment by a
     successor trustee or by a co-trustee or separate trustee; or

          (h)  to provide for the procedures required to permit the Company to
     use a non-certificated system of registration for all, or any series or
     tranche of, the Mortgage Securities; or

          (i)  to change any place or places where (i) the principal of and
     premium, if any, and interest, if any, on all or any series of Mortgage
     Securities, or any tranche thereof, will be payable, (ii) all or any series
     of Mortgage Securities, or any tranche thereof, may be surrendered for
     registration of transfer, (iii) all or any series of Mortgage Securities,
     or any tranche thereof, may be surrendered for exchange and (iv) notices
     and demands to or upon the Company in respect of all or any series of
     Mortgage Securities, or any tranche thereof, and the 1993 Mortgage may be
     served; or

          (j)  to cure any ambiguity, to correct or supplement any provision
     therein which may be defective or inconsistent with any other provision
     therein, or to make any other changes to the provisions thereof or to add
     other provisions with respect to matters and questions arising under the
     1993 Mortgage, so long as such other changes or additions do not adversely
     affect the interests of the Holders of Mortgage Securities of any series or
     tranche in any material respect.

(See Section 1401.)

     Without limiting the generality of the foregoing, if the Trust Indenture
Act of 1939, as amended (the "Trust Indenture Act"), is amended after the date
of the Original 1993 Mortgage in such a way as to require changes to the 1993
Mortgage or the incorporation therein of additional provisions or so as to
permit changes to, or the elimination of, provisions which, at the date of the
Original 1993 Mortgage or at any time thereafter, were required by the Trust
Indenture Act to be contained in the 1993 Mortgage, the 1993 Mortgage will be
deemed to have been amended so as to conform to such amendment or to effect such
changes or elimination, and the Company and the 1993 Mortgage Trustee may,
without the consent of any Holders, enter into one or more supplemental
indentures to evidence or effect such amendment.  (See Section 1401.)

     Except as provided above, the consent of the Holders of not less than a
majority in aggregate principal amount of the Mortgage Securities of all series
then Outstanding, considered as one class, is required for the purpose of adding
any provisions to, or changing in any manner, or eliminating any of the
provisions of, the 1993 Mortgage pursuant to one or more supplemental
indentures; provided, however, that if less than all of the series of Mortgage
Securities Outstanding are directly affected by a proposed supplemental
indenture, then the consent only of the Holders of a majority in aggregate
principal amount of Outstanding Mortgage Securities of all series so directly
affected, considered as one class, will be required; and provided, further, that
if the Mortgage Securities of any series have been issued in more than one
tranche and if the proposed supplemental indenture directly affects the rights
of the Holders of one or more, but less than all, of such tranches, then the
consent only of the Holders of a majority in aggregate principal amount of the
Outstanding Mortgage Securities of all tranches so directly affected, considered
as one class, will be required; and provided, further, that no such amendment or
modification may (a) change the Stated Maturity of the principal of, or any
installment of principal of or interest on, any Mortgage Security, or reduce the
principal amount thereof or the rate of interest thereon (or the amount of any
installment of interest thereon), or change the method of calculating such rate,
or reduce any premium payable upon the redemption thereof, or reduce the amount
of the principal of any Discount Security that would be due and payable upon a
declaration of acceleration of Maturity, or change the coin or currency (or
other property) in which any Mortgage Security or any premium or the interest
thereon is payable, or impair the right to institute suit for the enforcement of
any such payment on or after the Stated Maturity of any Mortgage Security (or,
in the case of redemption, on or after the redemption date) without, in 


                                    -16-

<PAGE>

any such case, the consent of the Holder of such Mortgage Security; (b) 
permit the creation of any lien not otherwise permitted by the 1993 Mortgage 
ranking prior to the lien of the 1993 Mortgage with respect to all or 
substantially all of the Mortgaged Property or terminate the lien of the 1993 
Mortgage on all or substantially all of the Mortgaged Property, or deprive 
the Holders of the benefit of the lien of the 1993 Mortgage, without, in any 
such case, the consent of the Holders of all Mortgage Securities then 
Outstanding; (c) reduce the percentage in principal amount of the Outstanding 
Mortgage Securities of any series, or any tranche thereof, the consent of the 
Holders of which is required for any supplemental indenture, or the consent 
of the Holders of which is required for any waiver of compliance with any 
provision of the 1993 Mortgage or of any default thereunder and its 
consequences, or reduce the requirements for quorum or voting, without, in 
any such case, the consent of the Holder of each Outstanding Mortgage 
Security of such series or tranche; or (d) modify certain of the provisions 
of the 1993 Mortgage relating to supplemental indentures, waivers of certain 
covenants and waivers of past defaults with respect to the Mortgage 
Securities of any series, or any tranche thereof, without the consent of the 
Holder of each Outstanding Mortgage Security of such series or tranche. A 
supplemental indenture which changes or eliminates any covenant or other 
provision of the 1993 Mortgage which has expressly been included solely for 
the benefit of the Holders of, or which is to remain in effect only so long 
as there shall be Outstanding Mortgage Securities of one or more specified 
series, or one or more tranches thereof, or modifies the rights of the 
Holders of Mortgage Securities of such series or tranches with respect to 
such covenant or other provision, will be deemed not to affect the rights 
under the 1993 Mortgage of the Holders of the Mortgage Securities of any 
other series or tranche.  (See Section 1402.)

     VOTING OF CLASS A BONDS:  The 1993 Mortgage provides that the 1993 Mortgage
Trustee will, as holder of Class A Bonds issued under the 1939 Mortgage as the
basis for the issuance of Mortgage Securities, attend such meetings of
bondholders under the related Class A Mortgage, or deliver its proxy in
connection therewith, as relate[s] to matters with respect to which it is
entitled to vote or consent.  The 1993 Mortgage provides that, so long as no
Event of Default as defined in the 1993 Mortgage has occurred and is continuing,
the 1993 Mortgage Trustee will, as holder of such Class A Bonds (a) vote in
favor of the amendments and modifications to the 1939 Mortgage described under
"DESCRIPTION OF THE 1939 MORTGAGE -- Voting of Class A Bonds Issued Under the
1939 Mortgage", and (b) with respect to any amendments or modifications to any
Class A Mortgage other than those amendments or modifications referred to in
(a), vote all Class A Bonds Outstanding under such Class A Mortgage then held by
it, or consent with respect thereto, proportionately with the vote or consent of
holders of all other Class A Bonds Outstanding under such Class A Mortgage the
holders of which are eligible to vote or consent, as evidenced by a certificate
delivered by the trustee under such Class A Mortgage; provided, however, that
the 1993 Mortgage Trustee will not vote in favor of, or consent to, any
amendment or modification of a Class A Mortgage which, if it were an amendment
or modification of the 1993 Mortgage, would require the consent of Holders of
Mortgage Securities as described under "Modification of the 1993 Mortgage",
without the prior consent of Holders of Mortgage Securities which would be
required for such an amendment or modification of the 1993 Mortgage.  (See
Section 705.)

     WAIVER:  The Holders of at least a majority in aggregate principal amount
of all Mortgage Securities may waive the Company's obligations to comply with
certain covenants, including the covenants to maintain its corporate existence
and properties, pay taxes and discharge liens, maintain certain insurance and
make such recordings and filings as are necessary to protect the security of the
Holders and the rights of the 1993 Mortgage Trustee and the covenant described
above with respect to merger, consolidation or the transfer or lease of the
Mortgaged Property as, or substantially as, an entirety, provided that such
waiver occurs before the time such compliance is required.  The Holders of at
least a majority of the aggregate principal amount of Outstanding Mortgage
Securities of all affected series or tranches, considered as one class, may
waive, before the time for such compliance, compliance with any covenant
specified with respect to Mortgage Securities of such series or tranches. (See
Section 609.)

     EVENTS OF DEFAULT:  Each of the following events constitutes an Event of
Default under the 1993 Mortgage:


                                    -17-

<PAGE>

          (a)  failure to pay interest on any Mortgage Security within 60 days
     after the same becomes due;

          (b)  failure to pay principal of or premium, if any, on any Mortgage
     Security within 3 business days after the Maturity thereof;

          (c)  failure to perform or breach of any covenant or warranty of the
     Company contained in the 1993 Mortgage (other than a covenant or warranty a
     default in the performance of which or breach of which is dealt with
     elsewhere under this paragraph) for a period of 90 days after there has
     been given to the Company by the 1993 Mortgage Trustee, or to the Company
     and the 1993 Mortgage Trustee by the Holders of at least 33% in principal
     amount of Outstanding Mortgage Securities, a written notice specifying such
     default or breach and requiring it to be remedied and stating that such
     notice is a "Notice of Default", unless the 1993 Mortgage Trustee, or the
     1993 Mortgage Trustee and the Holders of a principal amount of Mortgage
     Securities not less than the principal amount of Mortgage Securities the
     Holders of which gave such notice, as the case may be, agree in writing to
     an extension of such period prior to its expiration; provided, however,
     that the 1993 Mortgage Trustee, or the 1993 Mortgage Trustee and such
     Holders, as the case may be, will be deemed to have agreed to an extension
     of such period if corrective action has been initiated by the Company
     within such period and is being diligently pursued;

          (d)  certain events relating to reorganization, bankruptcy and
     insolvency of the Company or appointment of a receiver or trustee for its
     property; and

          (e)  the occurrence of a matured event of default under any Class A
     Mortgage (other than any such matured event of default which is of similar
     kind or character to the Event of Default described in (c) above and which
     has not resulted in the acceleration of the Class A Bonds Outstanding under
     such Class A Mortgage); provided that the waiver or cure of any such event
     of default and the rescission and annulment of the consequences thereof
     shall constitute a waiver of the corresponding Event of Default under the
     1993 Mortgage and a rescission and annulment of the consequences thereof. 
     (See Section 1001.)

     REMEDIES:  If an Event of Default occurs and is continuing, then the 1993
Mortgage Trustee or the Holders of not less than 33% in principal amount of
Mortgage Securities then Outstanding may declare the principal amount (or if the
Mortgage Securities are Discount Securities, such portion of the principal
amount of such Discount Securities as may be provided for  pursuant to the terms
of the 1993 Mortgage) of all of the Mortgage Securities then Outstanding,
together with premium, if any, and accrued interest, if any, thereon to be
immediately due and payable.  At any time after such declaration of acceleration
of the Mortgage Securities then Outstanding, but before the sale of any of the
Mortgaged Property and before a judgment or decree for payment of money shall
have been obtained by the 1993 Mortgage Trustee as provided in the 1993
Mortgage, the Event or Events of Default giving rise to such declaration of
acceleration will, without further act, be deemed to have been waived, and such
declaration and its consequences will, without further act, be deemed to have
been rescinded and annulled, if

          (a)  the Company has paid or deposited with the 1993 Mortgage Trustee
     a sum sufficient to pay:

               (i)    all overdue interest, if any, on all Mortgage Securities
          then Outstanding;

               (ii)   the principal of and premium, if any, on any Mortgage
          Securities then Outstanding which have become due otherwise than by
          such declaration of acceleration and interest thereon at the rate or
          rates prescribed therefor in such Mortgage Securities; and


                                    -18-

<PAGE>

               (iii)  all amounts due to the 1993 Mortgage Trustee as
          compensation and reimbursement as provided in the 1993 Mortgage; and

          (b)  any other Event or Events of Default, other than the non-payment
     of the principal of Mortgage Securities which shall have become due solely
     by such declaration of acceleration, shall have been cured or waived as
     provided in the 1993 Mortgage.  (See Sections 1002 and 1017.)

     The 1993 Mortgage provides that, under certain circumstances and to the
extent permitted by law, if an Event of Default occurs and is continuing, the
1993 Mortgage Trustee has the power to take possession of, and to hold, operate
and manage, the Mortgaged Property or, with or without entry, sell the Mortgaged
Property.  If the Mortgaged Property is sold, whether by the 1993 Mortgage
Trustee or pursuant to judicial proceedings, the principal of the Outstanding
Mortgage Securities, if not previously due, will become immediately due,
together with premium, if any, and any accrued interest.  (See Sections 1003,
1004 and 1005.)

     If an Event of Default occurs and is continuing, the Holders of a majority
in principal amount of the Mortgage Securities then Outstanding will have the
right to direct the time, method and place of conducting any proceedings for any
remedy available to the 1993 Mortgage Trustee or exercising any trust or power
conferred on the 1993 Mortgage Trustee, provided that (a) such direction does
not conflict with any rule of law or with the 1993 Mortgage, and could not
involve the 1993 Mortgage Trustee in personal liability in circumstances where
indemnity would not, in the 1993 Mortgage Trustee's sole discretion, be adequate
and (b) the 1993 Mortgage Trustee may take any other action deemed proper by the
1993 Mortgage Trustee which is not inconsistent with such direction.  (See
Section 1016.)

     The 1993 Mortgage provides that no Holder of any Mortgage Security will
have any right to institute any proceeding, judicial or otherwise, with respect
to the 1993 Mortgage or for the appointment of a receiver or for any other
remedy thereunder unless (a) such Holder has previously given to the 1993
Mortgage Trustee written notice of a continuing Event of Default; (b) the
Holders of not less than a majority in aggregate principal amount of the
Mortgage Securities then Outstanding have made written request to the 1993
Mortgage Trustee to institute proceedings in respect of such Event of Default
and have offered the 1993 Mortgage Trustee reasonable indemnity against costs
and liabilities to be incurred in complying with such request; and (c) for 60
days after receipt of such notice, the 1993 Mortgage Trustee has failed to
institute any such proceeding and no direction inconsistent with such request
has been given to the 1993 Mortgage Trustee during such 60-day period by the
Holders of a majority in aggregate principal amount of Mortgage Securities then
Outstanding.  Furthermore, no Holder will be entitled to institute any such
action if and to the extent that such action would disturb or prejudice the
rights of other Holders.  (See Section 1011.)  Notwithstanding that the right of
a Holder to institute a proceeding with respect to the 1993 Mortgage is subject
to certain conditions precedent, each Holder of a Mortgage Security has the
right, which is absolute and unconditional, to receive payment of the principal
of and premium, if any, and interest, if any, on such Mortgage Security when due
and to institute suit for the enforcement of any such payment, and such rights
may not be impaired without the consent of such Holder.  (See Section 1012.) 
The 1993 Mortgage provides that the 1993 Mortgage Trustee give the Holders
notice of any default under the 1993 Mortgage to the extent required by the
Trust Indenture Act, unless such default shall have been cured or waived, except
that no such notice to Holders of a default of the character described in clause
(c) under "Events of Default" may be given until at least 75 days after the
occurrence thereof.  For purposes of the preceding sentence, the term "default"
means any event which is, or after notice or lapse of time, or both, would
become, an Event of Default.  (See Section 1102.)  The Trust Indenture Act
currently permits the 1993 Mortgage Trustee to withhold notices of default
(except for certain payment defaults) if the 1993 Mortgage Trustee in good faith
determines the withholding of such notice to be in the interests of the Holders.

     As a condition precedent to certain actions by the 1993 Mortgage Trustee in
the enforcement of the lien of the 1993 Mortgage and institution of action on
the Mortgage Securities, the 1993 Mortgage Trustee 


                                    -19-

<PAGE>

may require adequate indemnity against costs, expenses and liabilities to be 
incurred in connection therewith.  (See Sections 1011 and 1101.)

     In addition to every other right and remedy provided in the 1993 Mortgage,
the 1993 Mortgage Trustee may exercise any right or remedy available to the 1993
Mortgage Trustee in its capacity as owner and holder of Class A Bonds which
arises as a result of a default or matured event of default under any Class A
Mortgage, whether or not an Event of Default under the 1993 Mortgage has
occurred and is continuing.  (See Section 1020.)

     DEFEASANCE:  Any Mortgage Security or Securities, or any portion of the
principal amount thereof, will be deemed to have been paid for purposes of the
1993 Mortgage, and, at the Company's election, the entire indebtedness of the
Company in respect thereof will be deemed to have been satisfied and discharged,
if there has been irrevocably deposited with the 1993 Mortgage Trustee or any
Paying Agent (other than the Company), in trust:  (a) money (including Funded
Cash not otherwise applied pursuant to the 1993 Mortgage) in an amount which
will be sufficient, or (b) Eligible Obligations (as described below), which do
not contain provisions permitting the redemption or other prepayment thereof at
the option of the issuer thereof, the principal of and the interest on which
when due, without any regard to reinvestment thereof, will provide moneys which,
together with the money, if any, deposited with or held by the 1993 Mortgage
Trustee or such Paying Agent, will be sufficient, or (c) a combination of (a)
and (b) which will be sufficient, to pay when due the principal of and premium,
if any, and interest, if any, due and to become due on such Mortgage Security or
Securities or portions thereof.  (See Section 901.)  For this purpose, Eligible
Obligations include direct obligations of, or obligations unconditionally
guaranteed by, the United States of America, entitled to the benefit of the full
faith and credit thereof, and certificates, depository receipts or other
instruments which evidence a direct ownership interest in such obligations or in
any specific interest or principal payments due in respect thereof.

     It is possible that for federal income tax purposes any deposit
contemplated in the preceding paragraph could be treated as a taxable exchange
of the related Mortgage Securities for an issue of obligations of the trust or a
direct interest in the cash and securities held in the trust.  In that case,
Holders of such Mortgage Securities would recognize gain or loss as if the trust
obligations or the cash or securities deposited, as the case may be, had
actually been received by them in exchange for their Mortgage Securities.  Such
gain or loss, generally, would be capital in nature to Holders for whom the
Mortgage Securities are held as capital assets and any deductions for losses
would be subject to certain limitations.  Such Holders thereafter would be
required to include in income a share of the income, gain or loss of the trust
or the income from the securities held in trust, as the case may be.  The amount
so required to be included in income could be different from the amount that
would be includible in the absence of such deposit.  Prospective investors are
urged to consult their own tax advisors as to the specific consequences to them
of such deposit.

     RESIGNATION OF THE 1993 MORTGAGE TRUSTEE:  The 1993 Mortgage Trustee may
resign at any time by giving written notice thereof to the Company or may be
removed at any time by Act of the Holders of a majority in principal amount of
Mortgage Securities then Outstanding delivered to the 1993 Mortgage Trustee and
the Company.  No resignation or removal of the 1993 Mortgage Trustee and no
appointment of a successor 1993 Mortgage Trustee will become effective until the
acceptance of appointment by a successor 1993 Mortgage Trustee in accordance
with the requirements of the 1993 Mortgage.  So long as no Event of Default or
event which, after notice or lapse of time, or both, would become an Event of
Default has occurred and is continuing, if the Company has delivered to the 1993
Mortgage Trustee a resolution of its Board of Directors appointing a successor
1993 Mortgage Trustee and such successor has accepted such appointment in
accordance with the terms of the 1993 Mortgage, the 1993 Mortgage Trustee will
be deemed to have resigned and the successor will be deemed to have been
appointed as 1993 Mortgage Trustee in accordance with the 1993 Mortgage.  (See
Section 1110.)


                                    -20-

<PAGE>

     EVIDENCE TO BE FURNISHED TO THE 1993 MORTGAGE TRUSTEE:  Compliance with
1993 Mortgage provisions is evidenced by written statements of Company officers
or persons selected or paid by the Company.  In certain cases, opinions of
counsel and certification of an engineer, accountant, appraiser or other expert
(who in some cases must be independent) must be furnished.  In addition, the
1993 Mortgage requires that the Company give the 1993 Mortgage Trustee, not less
often than annually, a brief statement as to the Company's compliance with the
conditions and covenants under the 1993 Mortgage.

     CONCERNING THE 1993 MORTGAGE TRUSTEE:  The Company conducts banking
transactions with affiliates of the 1993 Mortgage Trustee in the normal course
of the Company's business and uses the 1993 Mortgage Trustee or its affiliates
as trustee for various debt issues.

                           DESCRIPTION OF THE 1939 MORTGAGE

     GENERAL:  The summaries under this heading do not purport to be complete
and are subject to the detailed provisions of the 1939 Mortgage.  Capitalized
terms used under this heading which are not otherwise defined hereunder shall
have the meanings ascribed thereto in the 1939 Mortgage.  Wherever particular
provisions or terms defined therein are referred to, such provisions or
definitions are incorporated by reference as part of the statements made herein
and such statements are qualified in their entirety by such reference. 
References to article and section numbers herein, unless otherwise indicated,
are references to article and section numbers of the Original 1939 Mortgage.

     SECURITY:  Class A Bonds issued under the 1939 Mortgage will rank PARI
PASSU, except as to any sinking fund or similar fund provided for a particular
series, with all bonds at any time outstanding under the 1939 Mortgage.  In the
opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., based on information obtained
from public records and from the Company, the 1939 Mortgage constitutes a first
mortgage lien on the property specifically or generally described therein as
subject to the lien thereof, except such property as may have been disposed of
or released from the lien thereof in accordance with the terms thereof, subject
to no liens prior to the lien of the 1939 Mortgage other than Permitted
Encumbrances, as defined therein; and the 1939 Mortgage by its terms effectively
subjects to the lien thereof all property (except property of the kinds
specifically excepted from the lien thereof) acquired by the Company after the
date of the execution and delivery thereof, subject to Permitted Encumbrances,
to any lien thereon existing, and to any liens for unpaid portions of the
purchase money placed thereon, at the time of such acquisition, and also subject
to certain limitations in the case of consolidation, merger or sale of
substantially all the mortgaged property.  The principal properties subject to
the lien of the 1939 Mortgage are the electric and gas properties owned by the
Company and securities of certain subsidiaries.  (See Granting and Habendum
Clauses, Sections 2 and 3 of Article I, and Section 3 of Article XI of the 1939
Mortgage.)

     The 1939 Mortgage provides that the 1939 Mortgage Trustee shall have a lien
prior to the bonds on the mortgaged property for payment of its compensation,
expenses and disbursements and for indemnity against certain liabilities.  (See
Section 10 of Article XII of the 1939 Mortgage.)

     ISSUANCE OF ADDITIONAL BONDS UNDER THE 1939 MORTGAGE:  Additional bonds may
be issued under the 1939 Mortgage in a principal amount equal to (a) 60% of net
property additions (as defined in the 1939 Mortgage) acquired or constructed
within five years of certification to the 1939 Mortgage Trustee, (b) the
principal amount of certain retired bonds or prior lien bonds or (c) deposited
cash (in certain cases 60% thereof).  See "Voting of Class A Bonds Issued Under
the 1939 Mortgage".

     No bonds may be issued under the 1939 Mortgage, as provided in clauses 
(a) and (c) above, unless the net earnings of the Company (as defined in 
Section 5 of Article I of the 1939 Mortgage and as discussed below) are at 
least 2 1/2 times the annual interest on all bonds issued and outstanding 
under the 1939 Mortgage, including the bonds applied for (but excluding any 
bonds to be paid, retired or redeemed with the proceeds of the bonds applied 
for), and indebtedness secured by prior liens.  Such net earnings test 
generally need not be 


                                    -21-

<PAGE>

satisfied prior to the issuance of bonds as provided in clause (b) above 
unless (x) the new bonds are issued more than two years prior to the stated 
maturity of the retired bonds and the new bonds bear a greater rate of 
interest than the retired bonds or (y) the new bonds are issued in respect of 
retired bonds, the interest charges on which have been excluded from any net 
earnings certificate filed with the 1939 Mortgage Trustee since the 
retirement of such bonds.  (See Article III of the 1939 Mortgage.)  See 
"Voting of Class A Bonds Issued Under the 1939 Mortgage".

     Cash deposited under clause (c) above may be withdrawn by the Company in an
amount equal to the principal amounts of bonds issuable pursuant to clauses (a)
and (b) above (in certain cases 166-2/3% thereof) without regard to earnings or
may be applied to the purchase or redemption of bonds of one or more series
selected by the Company.  (See Sections 8, 9 and 10 of Article III of the 1939
Mortgage.)  See "Voting of Class A Bonds Issued Under the 1939 Mortgage".

     Net earnings are computed before provision for depreciation and
amortization of property, income and profits taxes (as defined in the 1939
Mortgage), interest on any indebtedness and amortization of debt discount and
expense and do not take into account any profits or losses from the sale or
disposal of capital assets or securities.  (See Section 5 of Article I of the
1939 Mortgage.)

     Property additions under the 1939 Mortgage consist of property used or
useful in the electric, gas or steam business (with certain exceptions) acquired
or constructed by the Company within five years next preceding the certification
thereof to the 1939 Mortgage Trustee.  (See Section 4 of Article I of the 1939
Mortgage.)  See "Voting of Class A Bonds Issued Under the 1939 Mortgage".

     The approximate amount of net property additions as of December 31, 1997,
and the amount of retired bonds as of December 31, 1997, available for use as
the basis for the issuance of Class A Bonds under the 1939 Mortgage, subject to
the net earnings restrictions discussed above, were $758,333,879 and
$669,480,000, respectively.  The Company will determine, at the time of each
issuance of Class A Bonds under the 1939 Mortgage which are to be the basis for
the issuance of New Bonds, whether such Class A Bonds will be issued upon the
basis of property additions or retired bonds.  As of December 31, 1997,
$1,424,417,000 in aggregate principal amount of bonds were outstanding under the
1939 Mortgage, $822,167,000 aggregate principal amount of which was held by the
1993 Mortgage Trustee as security for outstanding Mortgage Securities under the
1993 Mortgage.

     The 1939 Mortgage contains restrictions on (a) the acquisition of property
securing prior lien indebtedness in excess of 60% of the fair value of the
property and (b) the issuance of bonds, withdrawal of cash or release of
property on the basis of property subject to a prior lien.  Prior lien
indebtedness secured by property theretofore acquired may not be increased
unless the evidence thereof is pledged with the 1939 Mortgage Trustee.  (See
Section 4 of Article I and Sections 15, 17 and 19 of Article IV of the 1939
Mortgage.)  See "Voting of Class A Bonds Issued Under the 1939 Mortgage".

     MAINTENANCE AND REPLACEMENT FUND FOR BONDS OUTSTANDING UNDER THE 1939
MORTGAGE:  Although there will be no provision for a maintenance and replacement
fund with respect to Class A Bonds issued under the 1939 Mortgage as the basis
for the issuance of New Bonds, the Company has covenanted, with respect to
various series of outstanding bonds issued under the 1939 Mortgage maturing
through July 1, 1998, that, so long as any bond of such series remains
outstanding, the Company will, for each calendar year (herein called the
"accounting period"), pay to the 1939 Mortgage Trustee, as a Maintenance and
Replacement fund, an amount in cash not less than the sum of 15% of the gross
electric operating revenues and 10% of the gross gas and steam operating
revenues (as defined in the 1939 Mortgage, which, among other things, provides
for the deduction therefrom the cost of purchased electric current, gas and
steam) derived from the mortgaged property during the accounting period, LESS,
HOWEVER, the following optional credits:  (a) expenditures during the accounting
period for repairs and maintenance of the mortgaged property; (b) the cost of
property additions during the accounting period deemed to renew or replace
retired or abandoned property, subject to adjustment 


                                    -22-

<PAGE>

for any outstanding prior lien bonds secured by such property additions; (c) 
the principal amount of all bonds and/or 166-2/3% of the principal amount of 
all prior lien bonds, retired or redeemed and for which no bonds have been 
issued, credit taken or cash withdrawn under the 1939 Mortgage; and (d) net 
property additions to the extent of 100% thereof.  Cash so deposited may be 
applied to the purchase or redemption of such bonds as the Company may 
designate, which by their terms are redeemable prior to maturity (including 
any of the Class A Bonds issued under the 1939 Mortgage that are so 
redeemable and that were issued as the basis for the issuance of Bonds) at a 
price not exceeding the then current redemption price as set forth in the 
relevant supplemental indenture and the accrued interest on such bonds, or 
may be withdrawn upon the basis of certain property additions or certain 
retired bonds or prior lien bonds.  (See Section 8 of Article IV of the 1939 
Mortgage and Article Two of certain supplemental indentures.)  See "Voting of 
Class A Bonds Issued Under the 1939 Mortgage".

     The series of outstanding bonds which contain maintenance and replacement
fund covenants mature through July 1, 1998, but may be redeemed prior to their
stated maturity.  The Company does not anticipate issuing any additional series
of bonds under the 1939 Mortgage which will contain such covenants.  The Company
will no longer be bound by such covenants after all the bonds of such series
have been retired.

     MODIFICATION OF THE 1939 MORTGAGE:  The 1939 Mortgage and the rights of
bondholders thereunder may be modified with the consent of the Company, and of
the 1939 Mortgage Trustee if deemed affected, and the consent of the holders of
not less than 75% in principal amount of the bonds then outstanding, or of not
less than 75% in principal amount of the outstanding bonds of any one or more
series which may be affected by any such modification; except that the
bondholders, without the consent of the holder of each bond affected, have no
power to (a) extend the time of payment of the principal of or interest on any
bonds; (b) reduce the principal amount thereof or the rate of interest thereon,
or otherwise modify the terms of payment of principal or interest; (c) permit
the creation of any lien ranking prior to or on a parity with the lien of the
1939 Mortgage with respect to any of the mortgaged property; (d) deprive any
nonassenting bondholder of a lien upon the mortgaged property for the security
of his/her bonds; or (e) reduce the percentage of bondholders authorized to take
such action. (See Article XIV of the 1939 Mortgage.)  The Company has reserved
the right to amend the 1939 Mortgage without any consent or other action by
holders of any series of bonds created after October 31, 1975 (including Class A
Bonds issued under the 1939 Mortgage as the basis for the issuance of New Bonds)
to reduce the required consent of bondholders described above from 75% to 60%. 
(See Article Five of the Supplemental Indenture dated as of November 1, 1977.)

     VOTING OF CLASS A BONDS ISSUED UNDER THE 1939 MORTGAGE:  The 1993 Mortgage
provides that, so long as no Event of Default as defined in the 1993 Mortgage
has occurred and is continuing thereunder, the 1993 Mortgage Trustee will, as
holder of Class A Bonds issued under the 1939 Mortgage and delivered as the
basis for the issuance of Bonds,

          (a)  vote or consent in favor of amendments or modifications to the
     1939 Mortgage of substantially the same tenor and effect as follows:

               (i)    to expand the definition of property additions to
          eliminate geographical restrictions to certain states and allow the
          inclusion of properties located anywhere in the United States, Canada
          and Mexico, or their coastal waters; to include space satellites and
          stations, solar power satellites and other analogous facilities; to
          include nuclear fuel and other analogous devices or substances and to
          establish other provisions as to such fuel; to include properties
          located on leased real property, subject to certain limitations; to
          include goodwill when acquired with a public utility system, subject
          to certain limitations; and to delete the requirement that property
          additions must have been acquired or constructed within five years;

               (ii)   to remove the requirement that certificates delivered to
          the 1939 Mortgage Trustee be verified;


                                    -23-

<PAGE>

               (iii)  to liberalize the requirements for publication of notices
          of redemption and other notices;

               (iv)   to eliminate the maintenance and replacement fund or, in
          the alternative,

                      (A) to change the amount of cash deliverable to the 1939
                      Mortgage Trustee to the lower of (x) 10% of the combined
                      electric, gas and steam gross operating revenues of the
                      Company or (y) 2% of the cost of the depreciable property
                      of the Company, less the accumulated provision for
                      depreciation; and

                      (B) to change the definition of gross operating revenues
                      to deduct the cost of fuel used to provide electric, gas
                      and steam services;

               (v)    to change the opinion of counsel required to be delivered
          upon the certification of property additions to delete the requirement
          that the Company have all necessary permission from governmental
          authorities to use and operate such property additions;

               (vi)   to specifically allow the inclusion of earnings collected
          subject to refund in net earnings for purposes of the interest
          coverage requirement for the issuance of bonds;

               (vii)  to specifically permit the debt component, in addition to
          the equity component, of the allowance for funds used during
          construction to be included in net earnings for purposes of the
          interest coverage requirement for the issuance of bonds;

               (viii) (A) to reduce the interest coverage requirement for the
                      issuance of bonds to 2 times from 2 1/2 times annual
                      interest charges on outstanding bonds, including bonds
                      applied for, and prior lien indebtedness; or, in the
                      alternative,

                      (B) to change such coverage requirement to a requirement
                      that net earnings be at least equal to either (x) 2 (or
                      any higher amount) times annual interest charges on, or
                      (y) 15% (or any higher percentage) of the aggregate
                      principal amount of, outstanding bonds, including the
                      bonds applied for, and prior lien indebtedness;

               (ix)   to remove the restrictions on acquiring property subject
          to a prior lien (retaining, however, the restrictions on certifying
          such property as property additions);

               (x)    to raise the minimum dollar amount of fire and other
          losses that must be payable to the 1939 Mortgage Trustee from $50,000
          to 3% (or any higher percentage) of the principal amount of
          outstanding bonds; and to specifically permit the Company to carry
          insurance policies with deductible provisions equal to 3% (or any
          higher percentage) of the principal amount of outstanding bonds or any
          higher deductible amount usually contained in the policies of other
          companies owning and operating similar properties;

               (xi)   to delete the covenant of the Company to "observe and
          conform to all valid requirements of any governmental authority
          relative to any of the mortgaged property";


                                    -24-

<PAGE>

               (xii)  to delete the requirement that the 1939 Mortgage Trustee
          be located in New York, New York and that the Company maintain an
          office in New York, New York, to make payments on bonds and register
          transfers thereof;

               (xiii) to modify the special release provision of the 1939
          Mortgage to increase the amount of the aggregate value of property
          which may be released from the lien of the 1939 Mortgage within any
          period of 12 consecutive calendar months without compliance with all
          the conditions of the general release provision from $25,000 to (A)
          the greater of $25,000 or 1% of the aggregate principal amount of
          outstanding bonds or (B) the greater of $10,000,000 or 3% of the
          aggregate principal amount of outstanding bonds (or any lower amount
          or percentage);

               (xiv)  to permit bonds to be issued under the 1939 Mortgage in a
          principal amount equal to 70% of net property additions instead of 60%
          and to make correlative changes in provisions relating to, among other
          things, the release of property from the lien of the 1939 Mortgage,
          the withdrawal of cash held by the 1939 Mortgage Trustee, the
          acquisition and use under the 1939 Mortgage of property securing prior
          lien indebtedness, and the use of retired prior lien bonds; and

               (xv)   to modify the definition of all defaults under the 1939
          Mortgage to be substantially identical to the Events of Default under
          the 1993 Mortgage; and

          (b)  with respect to any amendments or modifications to the 1939
     Mortgage other than those referred to in (a) above, vote all Class A Bonds
     Outstanding under the 1939 Mortgage then held by it, or consent with
     respect thereto, in the manner as described under "DESCRIPTION OF THE BONDS
     -- Voting of Class A Bonds".  (See Section 705 of the 1993 Mortgage.)

     The Company has reserved the right to make any or all of the modifications
to the 1939 Mortgage described in (a)(i) through (a)(xiii)(A) above without
consent or other action of the holders of certain outstanding series of bonds
previously issued under the 1939 Mortgage (not including the Class A Bonds
issued thereunder as the basis of the issuance of Mortgage Securities)
aggregating $423,500,000 in principal amount.  (See Article Three of the
Supplemental Indenture dated as of March 1, 1980 and Article Four of the
Supplemental Indentures dated as of July 1, 1990, December 1, 1990, and March 1,
1992, respectively).

     The indentures under which certain pollution control revenue bonds of
Morgan County, Colorado and Adams County, Colorado were issued provide that the
trustees thereunder, as holders of bonds issued under the 1939 Mortgage having a
principal amount of $156,750,000 in the aggregate, shall vote in favor of, or
consent with respect to, any or all of the possible modifications described in
(a)(i) through (a)(xiii)(A) above.

     DEFAULT UNDER THE 1939 MORTGAGE:  An event of default under the 1939
Mortgage includes a failure to pay interest on any bond, or to pay a sinking
fund installment, for 60 days after such payment becomes due, a failure to pay
the principal of or premium, if any, on any bond when the same becomes due, a
default with respect to the payment of principal of or interest on any prior
lien bonds, a failure to perform any other covenant in the 1939 Mortgage for 90
days after notice given to the Company by the 1939 Mortgage Trustee or by the
holders of 10% in principal amount of outstanding bonds, certain events in
bankruptcy, and an Event of Default under the 1993 Mortgage and/or certain
matured events of default under any other Class A Mortgage.  (See Section 1 of
Article VIII of the 1939 Mortgage and Article Five of the Supplemental Indenture
dated as of November 1, 1993 creating the First Mortgage Bonds, Collateral
Series A.)  The 1939 Mortgage Trustee may withhold notice of default (except
default in the payment of principal of or premium, if any, or interest on the
bonds or in the payment of a sinking fund installment) if it determines such
withholding to be in the interests of the bondholders.  (See Section 2 of
Article VIII of the 1939 Mortgage.)  The Company is required to report 


                                    -25-

<PAGE>

annually to the 1939 Mortgage Trustee as to compliance with the covenants 
contained in the 1939 Mortgage.  (See Section 24 of Article IV of the 1939 
Mortgage.)

     Upon the occurrence of a default under the 1939 Mortgage, the 1939 Mortgage
Trustee or the holders of 25% in principal amount of outstanding bonds may
declare the principal of and interest accrued on all outstanding bonds due and
payable immediately; PROVIDED, HOWEVER, that if such default has been cured, (a)
the holders of a majority in principal amount of outstanding bonds may annul
such declaration or (b) if, in making such declaration, the 1939 Mortgage
Trustee shall have acted without a direction from the holders of a majority in
principal amount of outstanding bonds, or if such declaration was made by the
holders of 25% in principal amount of outstanding bonds and the holders of a
majority in principal amount of outstanding bonds shall not have theretofore
delivered a written notice to the contrary, then such declaration shall IPSO
FACTO be deemed to be annulled.  (See Section 1 of Article VIII of the 1939
Mortgage.)

     ACTION BY 1939 MORTGAGE TRUSTEE:  Except as otherwise provided in the 1939
Mortgage, the holders of a majority in principal amount of bonds outstanding
under the 1939 Mortgage have the right to require the 1939 Mortgage Trustee to
enforce the lien of the 1939 Mortgage and direct the time, method and place of
conducting any proceedings for any remedy available to the 1939 Mortgage Trustee
under the 1939 Mortgage.  (See Section 15 of Article VIII of the 1939 Mortgage.)
No holder of bonds outstanding under the 1939 Mortgage has the right to enforce
the lien of the 1939 Mortgage without giving to the 1939 Mortgage Trustee
written notice of default and unless the holders of a majority in principal
amount of outstanding bonds shall have requested the 1939 Mortgage Trustee to
act and have offered the 1939 Mortgage Trustee security and indemnity
satisfactory to it against the costs, expenses and liabilities to be incurred
thereby and the 1939 Mortgage Trustee shall have failed to take action within 60
days.  (See Section 16 of Article VIII of the 1939 Mortgage.)

     CONCERNING THE 1939 MORTGAGE TRUSTEE:  The Company conducts banking
transactions with affiliates of the 1939 Mortgage Trustee in the normal course
of the Company's business and uses the 1939 Mortgage Trustee or its affiliates
as trustee for various debt issues.

                                          
                         DESCRIPTION OF THE DEBT SECURITIES
                                          
     The following description sets forth certain general terms and provisions
of the Debt Securities to which any Prospectus Supplement may relate.  The
particular terms of the Debt Securities offered by any Prospectus Supplement and
the extent, if any, to which such general provisions may apply to the Debt
Securities so offered will be described in the Prospectus Supplement relating to
such Debt Securities.

     The Debt Securities may be issued, from time to time, in one or more series
and will constitute either Senior Debt Securities or Subordinated Debt
Securities.  The Debt Securities will be unsecured obligations of the Company. 
The Senior Debt Securities and the Subordinated Debt Securities will be issued
under separate indentures although the description of the Indentures herein
applies to both Indentures unless specifically stated otherwise.  The Senior
Debt Securities will be issued under an Indenture (the "Senior Debt Securities
Indenture"), between the Company and The Bank of New York, as trustee (the
"Senior Debt Securities Trustee").  The Subordinated Debt Securities will be
issued under an Indenture (the "Subordinated Debt Securities Indenture"),
between the Company and The Bank of New York, as trustee (the "Subordinated Debt
Securities Trustee").  The Indentures are subject to being qualified under the
Trust Indenture Act of 1939, as amended (the "Trust Indenture Act").  A form of
each of the Indentures is filed as an exhibit to the Registration Statement of
which this Prospectus is a part.

     The Senior Debt Securities Indenture and the Subordinated Debt Securities
Indenture are referred to herein individually as an "Indenture" and,
collectively, as the "Indentures", and the Senior Debt Securities Trustee and
the Subordinated Debt Securities Trustee are referred to herein as the
"Indenture Trustee".


                                    -26-

<PAGE>

     The following summaries of certain provisions of the Debt Securities and
the Indentures do not purport to be complete and are subject to, and are
qualified in their entirety by the detailed provisions of the Indentures,
including the definitions therein of certain terms.  Certain capitalized terms
used under this heading which are not otherwise defined hereunder shall have the
meanings ascribed thereto in the Indentures.  Whenever particular provision of
the Indentures or terms defined therein are referred to, such provisions or
definitions are incorporated by reference as part of the statements made herein
and such statements are qualified in their entirety by such reference. 
References to article and section numbers herein, unless otherwise indicated,
are references to article and section numbers of the Indentures.

     GENERAL:  The Debt Securities will be unsecured obligations of the Company.
The Indentures do not limit the aggregate principal amount of Debt Securities
which may be issued thereunder, nor do they limit the incurrence or issuance of
other secured or unsecured debt of the Company.  Debt Securities may be issued
under the Indentures, from time to time, in one or more series.  (See Section
301.)

     The Debt Securities will rank PARI PASSU in right of payment with all other
unsecured indebtedness of the Company, except that the Senior Debt Securities
will be senior in right of payment to any subordinated indebtedness which, by
its terms, is subordinate to the Senior Debt Securities, including the
Subordinated Debt Securities. 

     Reference is made to the Prospectus Supplement relating to the Debt
Securities being offered (the "Offered Debt Securities") for, among other
things, the following terms thereof: (i) the title of the Offered Debt
Securities; (ii) any limit on the aggregate principal amount of the Offered Debt
Securities; (iii) whether or not the Debt Securities will be issued in global
form and the terms thereof and the depository therefor; (iv) the date or dates
on which the Offered Debt Securities will mature; (v) the rate or rates (which
may be fixed or variable) per annum at which the Offered Debt Securities will
bear interest or the method by which such rate or rates shall be determined and
the date from which such interest will accrue or the method by which such date
or dates shall be determined; (vi) the dates on which such interest will be
payable and the Regular Record Dates for such Interest Payment Dates or the
method of determining such dates; (vii) the date or dates, if any, on which, and
the price or prices at which, the Offered Debt Securities may, pursuant to any
mandatory or optional sinking fund provisions or otherwise, be redeemed by the
Company and other detailed terms and provisions thereof; (viii) the date, if
any, after which, and the price or prices at which, the Offered Debt Securities
may, pursuant to any optional redemption provisions, be redeemed at the option
of the Company or of the Holder thereof and other detailed terms and provisions
of any such optional redemption; (ix) the right of the Company, if any, to defer
payment of interest on the Subordinated Debt Securities and the maximum length
of any such deferral period; (x) the denominations in which the Offered Debt
Securities will be issued, if other than denominations of $1,000 and any
integral multiple thereof; (xi) the portion of the principal amount of the
Offered Debt Securities, if other than the principal amount thereof, which will
be payable upon declaration of acceleration of the maturity thereof;
(xii) additional Events of Default with respect to the Offered Debt Securities,
if any, other than those set forth in the appropriate Indenture; (xiii) the
currency or currencies or units based on or related to currencies in which the
Offered Debt Securities shall be denominated, and in which payments or principal
of, and any premium and interest on such Offered Debt Securities will be
payable, if other than U.S. dollars; (xiv) additional covenants, if any, with
respect to the Offered Debt Securities other than those set forth in the
appropriate Indenture; (xv) the identity of the Registrar or any Paying Agent,
if other than the Trustee; (xvi) any exceptions to provisions in the appropriate
Indenture relating to legal holidays or the definition of "Business Day" with
respect to the Offered Debt Securities; and (xvii) any other terms of the
Offered Debt Securities (which terms shall not be inconsistent with the
appropriate Indenture).  For a description of the terms of the Offered Debt
Securities, reference must be made to both the Prospectus Supplement relating
thereto and to the description of Debt Securities set forth herein.  (See
Section 301.)

     The Debt Securities may be issued under the Indentures as Original Issue
Discount Securities to be offered and sold at a substantial discount below their
principal amount.  Special federal income tax, accounting 


                                    -27-

<PAGE>

and other considerations applicable to any such Original Issue Discount 
Securities will be described in any Prospectus Supplement relating thereto.  
"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 as a result of the 
occurrence of an Event of Default and the continuation thereof.  (See 
Section 101.)

     Debt Securities of any series may be offered in a Periodic Offering, in
which any or all of the specific terms of each Security of such series may vary
from other Securities of such series, including with respect to rate or rates of
interest, if any, thereon, the Stated Maturity or Maturities thereof, the
redemption provisions, if any, and such other terms as may be permitted by the
Indenture and determined by the Company from time to time as provided in the
Indentures.

     CONSOLIDATION, MERGER OR SALE BY THE COMPANY:  Each Indenture provides that
the Company shall not consolidate with, 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:  (i) 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 merged or the Person (or group of affiliated Persons) to which
all or substantially all the properties and assets of the Company are sold,
assigned, transferred or leased is a corporation (or constitute corporations)
organized under the laws of the United States or any State thereof or the
District of Columbia and expressly assumes, by an indenture supplemental to the
Indenture, all the obligations of the Company under the Debt Securities issued
thereunder and the Indenture, executed and delivered to the Indenture Trustee in
form satisfactory to the Indenture Trustee; (ii) immediately before and after
giving effect to such transaction or series of transactions, no Event of
Default, and no Default, shall have occurred and be continuing; (iii) the
Company shall have delivered to the Indenture Trustee an Officer's Certificate
and an Opinion of Counsel, each stating that such consolidation, merger or
transfer and such supplemental indentures comply with the Indenture; and (iv)
such other conditions as may be established in connection with the issuance of
the applicable Debt Securities.  (See Article Eight.)

     EVENTS OF DEFAULT AND NOTICE THEREOF:  The following are Events of Default
under the Indentures with respect to Debt Securities of any series issued
thereunder: (i) failure by the Company to pay interest on any Debt Security of
that series when due and such failure continues for 30 days; (ii) failure by the
Company to pay the principal of (or premium, if any, on) any Debt Security of
that series when due and payable at Maturity, including upon redemption but
excluding any failure by the Company to deposit money in connection with any
redemption at the option of the Company; (iii) failure by the Company to observe
or perform any other covenant, warranty or agreement contained in the Debt
Securities of that series or in the Indenture (other than a covenant, agreement
or warranty included in the Indenture solely for the benefit of Debt Securities
other than that series), and such failure continues for a period of 60 days
after notice has been received by the Company from the Indenture Trustee or
Holders of at least 25% in aggregate principal amount of the Outstanding Debt
Securities of that series; (iv) certain events of bankruptcy, insolvency or
reorganization relating to the Company; (v) failure by the Company to pay
interest on any series of Debt Security issued under the Indenture and such
failure continues for 30 days, or failure to pay the principal of or premium, if
any, on any series of Debt Security issued under the Indenture when the same
shall become due and payable at Maturity (including upon redemption but
excluding any failure by the Company to deposit money in connection with any
redemption at the option of the Company) and the time for payment of such
interest or principal shall not have been extended; and (vi) any other Event of
Default with respect to Debt Securities of that series specified in the
Prospectus Supplement relating thereto or Supplemental Indenture under which
such series of Debt Securities is issued.  (See Section 501.)

     The Indentures provide that the Trustee thereunder shall, within 30 days
after the occurrence of any Default or Event of Default with respect to Debt
Securities of any series issued thereunder, give the Holders of 


                                    -28-

<PAGE>

Debt Securities of that series notice of all uncured Defaults or Events of 
Default known to it (the term "Default" includes any event which after notice 
or passage of time or both would be an Event of Default); provided, however, 
that, except in the case of an Event of Default or a Default in payment on 
any Debt Securities of any series, the Indenture 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 Indenture 
Trustee in good faith determine that the withholding of such notice is in the 
interest of the Holders of Debt Securities of the affected series.  (See 
Section 602.)

     If an Event of Default with respect to Debt Securities of any series (other
than due to events of bankruptcy, insolvency or reorganization) occurs and is
continuing, the Indenture Trustee or the Holders of at least 25% in aggregate
principal amount of the Outstanding Debt Securities of that series, by notice in
writing to the Company (and to the Indenture Trustee if given by the Holders of
at least 25% in aggregate principal amount of the Debt Securities of that
series), may declare the unpaid principal of and accrued interest, if any, to
the date of acceleration (or, if the Debt Securities are Original Issue Discount
Securities, such portion of that principal as may be specified in the terms
thereof) on all the Outstanding Debt Securities of that series to be due and
payable immediately and, upon any such declaration, the Debt Securities of that
series shall become immediately due and payable.  (See Section 502.)

     If an Event of Default occurs due to bankruptcy, insolvency or
reorganization, all unpaid principal of and accrued interest on the Outstanding
Debt Securities of all series will become immediately due and payable without
any declaration or other act on the part of the Indenture Trustee or any Holder
of any Debt Security.  (See Section 502.)

     Any such declaration with respect to Debt Securities of any series may be
annulled and past Events of Default and Defaults (except, unless theretofore
cured, an Event of Default or a Default in payment of principal of or interest
on the Debt Securities of that series) may be waived by the Holders of a
majority of the principal amount of the Outstanding Debt Securities of that
series, upon the conditions provided in the Indenture.  (See Section 513.)

     If the Subordinated Debt Securities of any series are then held by a
statutory trust created by the Company for the purpose of issuing preferred
securities and common securities and purchasing a series of Subordinated Debt
Securities with the proceeds thereof, each holder of the preferred securities of
the trust may bring suit directly against the Company for the enforcement of
payment to such holder in respect of the Subordinated Debt Securities of such
series held by the trust in a principal amount equal to the aggregate
liquidation amount of the preferred securities held by such holder.  At least a
majority of such holders of preferred securities of the trust must consent to
any waiver of an Event of Default with respect to the series of Subordinated
Debt Securities held by the trust and each such holder must consent to any
supplemental indenture that would adversely affect the interests of such
holders. (See Sections 502, 508, 513 and 902.)

     Subject to the provisions of the Indenture relating to the duties of the
Trustee in the event an Event of Default shall occur and be continuing, the
Trustee will be under no obligation to exercise any of its rights or powers
under the Indenture at the request or direction of any of the Holders, unless
such Holders have offered to the Trustee reasonable indemnity.  (See Section
603.)  The Holders of a majority in principal amount of the Outstanding Debt
Securities of any series will 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 Debt
Securities of that series; provided that (i) such direction is not in conflict
with any law or the Indenture; (ii) the Indenture Trustee may take any other
action deemed proper by the Indenture Trustee which is not inconsistent with
such direction; and (iii) subject to its duties under the Trust Indenture Act,
the Indenture Trustee need not take any action that might involve the Indenture
Trustee in personal liability or might be unduly prejudicial to the Holders not
joining therein.  (See Section 512.)


                                    -29-

<PAGE>

     No Holder of the Debt Securities of any series will have any right to
institute any proceeding with respect to the Indenture, or for the appointment
of a receiver or a trustee, or for any other remedy thereunder, unless (i) such
Holder has previously given to the Trustee written notice of a continuing Event
of Default with respect to the Debt Securities of that series, (ii) the Holders
of at least 25% in aggregate principal amount of the Outstanding Debt Securities
of that series have made written request, and such Holder or Holders have
offered reasonable indemnity, to the Trustee to institute such proceeding as
trustee and (iii) the Trustee has failed to institute such proceeding, and has
not received from the Holders of a majority in aggregate principal amount of the
Outstanding Debt Securities of that series a direction inconsistent with such
request, within 60 days after such notice, request and offer.  However, such
limitations do not apply to a suit instituted by a Holder of a Debt Security for
the enforcement of payment of the principal of or any premium or interest on
such Debt Security on or after the applicable due date specified in such Debt
Security.  (See Sections 507 and 508.)

     The Indentures provide that the Company shall periodically file statements
with the Indenture Trustee regarding compliance by the Company with certain of
the covenants therein and shall specify any Event of Default or Defaults with
respect to Debt Securities of any series outstanding thereunder, in performing
such covenants, of which the signers may have knowledge.  (See Section 704.)

     MODIFICATION OF INDENTURES; WAIVER:  The Indentures may be modified by the
Company and the applicable Indenture Trustee without the consent of any Holders
with respect to certain matters, including (i) to cure any ambiguity, defect or
inconsistency or to correct or supplement any provision which may be
inconsistent with any other provision of the Indenture and (ii) to make any
change that does not materially adversely affect the interests of any Holder of
Debt Securities of any series.  In addition, under the Indentures, certain
rights and obligations of the Company and the rights of Holders of the Debt
Securities may be modified by the Company and the Indenture Trustee with the
written consent of the Holders of at least a majority in aggregate principal
amount of the Outstanding Debt Securities of each series affected thereby; 
PROVIDED that no such modification or amendment may, without the consent of each
Holder of any Outstanding Debt Security affected thereby, (i) change the Stated
Maturity of the principal of, or any installment of principal of or interest on,
any such Debt Security; (ii) reduce the principal amount of, or the rate of
interest on, or any premium payable upon the redemption of, any such Debt
Security, or reduce the amount of principal of an Original Issue Discount
Security that would be due and payable upon declaration of acceleration of the
Maturity thereof; (iii) change the place of payment, or the coin or currency,
for payment of principal (or premium, if any) or interest on any Debt Security;
(iv) impair the right to institute suit for the enforcement of any payment on or
with respect to any such Debt Security; (v) modify any of the foregoing
provisions or any of the provisions relating to the waiver of certain past
defaults or certain covenants; (vi) modify the provisions of the Indenture with
respect to the subordination  of the Debt Securities in a manner adverse to the
holders; (vii) reduce the above-stated percentage of outstanding Debt Securities
of any series necessary to modify or amend the Indentures, or to waive
compliance with certain provisions thereof or Defaults or Events of Default
thereunder and the consequences thereof; or (viii) change the redemption
provisions of any Debt Security in a manner adverse to such holder.  (See
Article Nine.) 

     DEFEASANCE:  The Company may terminate its substantive obligations in
respect of Debt Securities  of any series (except for its obligations to pay the
principal of (and premium, if any, on) and the interest on the Debt Securities
of that series) by (i) depositing with the applicable Indenture Trustee, under
the terms of an irrevocable trust agreement, money or U.S. Government
Obligations or a combination thereof sufficient to pay all remaining
indebtedness on the Debt Securities of that series, (ii) delivering to such
Indenture Trustee either an Opinion of Counsel or a ruling directed to the
Indenture Trustee from the Internal Revenue Service to the effect that the
Holders of the Debt Securities of that series will not recognize income, gain or
loss for federal income tax purposes as a result of such deposit and termination
of obligations, and (iii) complying with certain other requirements set forth in
the Indenture.  (See Section 1304.)


                                    -30-

<PAGE>

     SUBORDINATION:  For purposes of the description of the Subordinated Debt
Securities, the term "Senior Indebtedness" shall mean the principal of and
premium, if any, and interest, if any, on the following, whether outstanding on
the date of execution of the 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 Debt
Securities issued under the Subordinated Debt Securities Indenture), 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 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; (vi)
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 assets 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 or renewal, extension or refunding thereof,
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 Subordinated Debt Securities.  The term "Capitalized Lease
Obligations" shall mean any obligation that is required to be classified and
accounted for as a capital lease on the face of a balance sheet of a Person
prepared in accordance with GAAP.

     The payment of the principal of and premium, if any, and any interest on
the Subordinated Debt Securities (including making any deposit pursuant to the
provisions described under "Defeasance" or repurchasing, redeeming or otherwise
retiring any Subordinated Debt Securities) will, to the extent set forth in the
Subordinated Debt Securities Indenture, be subordinated in right of payment to
the prior payment in full of all Senior Indebtedness of the Company.  Upon any
payment or distribution of assets or securities to creditors upon any
dissolution, winding up, or total or partial liquidation or reorganization of
the Company whether voluntary or involuntary or in bankruptcy, insolvency,
receivorship or similar proceedings of the Company, the holders of all Senior
Indebtedness of the Company will first be entitled to receive payment in full in
cash or cash equivalents of the principal of, premium, if any, or any interest
due thereon before the Holders of the Subordinated Debt Securities will be
entitled to receive any payment or distribution in respect of the principal of,
premium, if any, or any interest on the Subordinated Debt Securities, and in the
event that, notwithstanding the foregoing, the Trustee under the Subordinated
Indenture or the Holder of any Subordinated Debt Security receives any payment
or distribution of assets of any kind or character before all Senior
Indebtedness of the Issuer is paid in full, or effective provision is made for
its payments, then such payment or distribution will be required to be paid over
or 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 of the Company remaining unpaid, to the extent necessary to
pay all Senior Indebtedness of the Company then due in full. 

     No direct or indirect payment by or on behalf of the Company of principal
of, premium, if any, or interest on, the Subordinated Debt Securities, whether
pursuant to the terms of the Subordinated Debt 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 or (ii)
any other default pursuant to which the maturity of any Senior Indebtedness has
been accelerated and, in either case, requisite notice has been given to the
Subordinated Debt Securities Trustee and such default shall not have been cured
or waived by or on behalf of the holders of such Senior Indebtedness.

     Subject to the payment in full of all Senior Indebtedness of the Company,
the Holders of the Subordinated Debt Securities shall be subrogated to the
rights of holders of Senior Indebtedness of the Company to receive payments or
distributions or assets of the Company applicable to Senior Indebtedness of 


                                      -31-

<PAGE>

the Company until the Subordinated Debt Securities are paid in full.  As a 
result of these subordination provisions, in the event of the Company's 
insolvency, holders of the Subordinated Debt Securities may recover ratably 
less than holders of Senior Indebtedness of the Company.  (See Article 
Fourteen of the Subordinated Debt Securities Indenture.)  The Subordinated 
Debt Securities Indenture provisions described in this paragraph, however, do 
not prevent the Company from making a sinking fund payment with Subordinated 
Debt Securities acquired prior to the maturity of Senior Indebtedness or, in 
the case of default, prior to such default and notice thereof. 

     FORM, EXCHANGE, AND TRANSFER:  The Debt Securities of each series will be
issuable only in fully registered form without coupons and, unless otherwise
specified in the applicable Prospectus Supplement, in denominations of $1,000
and any integral multiple thereof.  (See Section 302.)

     At the option of the Holder, subject to the terms of the Indenture and the
limitations applicable to global securities described in the applicable
Prospectus Supplement, Debt Securities of any series will be exchangeable for
other Debt Securities of the same series, of any authorized denomination and of
like tenor and aggregate principal amount.  (See Section 305.)

     Subject to the terms of the Indenture and the limitations applicable to
global securities set forth in the applicable Prospectus Supplement, Debt
Securities may be presented for exchange or for registration of transfer (duly
endorsed or with the form of transfer endorsed thereon duly executed if so
required by the Company or the Indenture Trustee) at the office of the Security
Registrar or at the office of any transfer agent designated by the Company for
such purpose.  Unless otherwise provided in the Securities to be transferred or
exchanged, no service charge will be made for any registration of transfer or
exchange of Debt Securities, but the Company may require payment of a sum
therewith.  The Company has appointed the Trustee as Security Registrar.  Any
transfer agent (in addition to the Security Registrar) initially designated by
the Company for any Debt Securities will be named in the applicable Prospectus
Supplement.  The Company may at any time designate additional transfer agents or
rescind the designation of any transfer agent or approve a change in the office
through which any transfer agent acts, except that the Company will be required
to maintain a transfer agent in each Place of Payment for the Debt Securities of
each series.  (See Section 305.)

     If the Debt Securities of any series are to be redeemed, the Company will
not be required to (i) issue, register the transfer of, or exchange any Debt
Security of that series during a period beginning at the opening of business 15
days before the day of mailing of a notice of redemption of any such Debt
Security that may be selected for redemption and ending at the close of business
on the day of such mailing or (ii) register the transfer of or exchange any Debt
Security so selected for redemption, in whole or in  part, except the unredeemed
portion of any such Debt Security being redeemed in part.  (See Section 305.)

     PAYMENT AND PAYING AGENTS:  Unless otherwise indicated in the applicable
Prospectus Supplement, payment of the interest on a Debt Security on any
Interest Payment Date will be made to the Person in whose name such Debt
Security (or one or more Predecessor Debt Securities) is registered at the close
of business on the Regular Record Date for such interest.  (See Section 307.)

     Principal of and any premium and interest on the Debt Securities of a
particular series will be payable at the office of such Paying Agent or Paying
Agents as the Company may designate with respect to the Debt Securities of such
series for such purpose from time to time, except that unless otherwise
indicated in the applicable Prospectus Supplement, payment of any interest may
be made by check mailed to the address of the Person entitled thereto as such
address appears in the Security Register.  Unless otherwise indicated in the
applicable Prospectus Supplement, the corporate trust office of the Trustee in
The City of New York will be designated as the Company's sole Paying Agent for
payments with respect to Debt Securities of each series.  Any other Paying
Agents initially designated by the Company for the Debt Securities of a
particular series will be named in the applicable Prospectus Supplement.  The
Company will be required to maintain a Paying Agent in each Place of Payment for
the Debt Securities of a particular series. (See Sections 307 and 1002.)


                                      -32-

<PAGE>

     All moneys paid by the Company to a Paying Agent for the payment of their
principal of or any premium or interest on any Debt Security which remains
unclaimed at the end of two years after such principal, premium or interest has
become due and payable will be repaid to the Company, and the Holder of such
Debt Security thereafter may look only to the Company for payment thereof.  (See
Section 1008.)

     CONCERNING THE INDENTURE TRUSTEE:  The Company and its affiliates 
conduct banking transactions with the Indenture Trustee in the normal course 
of business.

              DESCRIPTION OF THE PREFERRED SECURITIES OF THE TRUST

     GENERAL:  The Trust may issue only one series of Preferred Securities which
shall have the terms described in the Prospectus Supplement relating thereto. 
The Declaration authorizes the Administrative Trustee to issue on behalf of the
Trust one series of Preferred Securities.  The Declaration will be qualified as
an indenture under the Trust Indenture Act.  The Property Trustee, The Bank of
New York, an independent trustee, will act as indenture trustee for the
Preferred Securities to be issued by the Trust, for the purpose of compliance
with the provisions of the Trust Indenture Act.  The proceeds from the sale of
the Preferred Securities and the Common Securities will be used by the Trust to
purchase a corresponding series of Subordinated Debt Securities from the
Company. The Subordinated Debt Securities of that series will be held in trust
by the Property Trustee for the benefit of the holders of the Trust Securities. 
Pursuant to the Preferred Securities Guarantee, the Company will agree to make
payments of Distributions and payments on redemption or liquidation with respect
to such Preferred Securities, but only to the extent the Trust holds funds
available therefor and has not made such payments.  See "DESCRIPTION OF THE
PREFERRED SECURITIES GUARANTEE".  The following summary of the Trust, the
Declaration and the Preferred Securities of the Trust does not purport to be
complete and is subject to, and qualified in its entirety by the detailed
provisions of the Amended and Restated Declaration of Trust and Form of
Certificate of Preferred Securities, forms of which are filed as exhibits to the
Registration Statement of which this Prospectus is a part.  Capitalized terms
used under this heading and not otherwise defined hereunder shall have the
meanings ascribed thereto in the Amended and Restated Declaration of Trust. 
Wherever particular provisions or terms defined therein are referred to herein,
such provisions or definitions are incorporated by reference as part of the
statements made herein and such statements are qualified in their entirety by
such reference.

     It is anticipated that the assets of the Trust available for distribution
to the holders of its Preferred Securities will be limited to payments from the
Company under the Subordinated Debt Securities in which the Trust will invest
the proceeds from the issuance and sale of its Trust Securities.  If the Company
fails to make a payment on such Subordinated Debt Securities, the Trust will not
have sufficient funds to make related  payments, including Distributions, on the
Preferred Securities.  The Preferred Securities will have such terms, including
distributions, redemption, voting, liquidation rights and such other preferred,
deferred or other special rights or such restrictions as shall be set forth in
the Declaration or made part of the Declaration by the Trust Indenture Act, and
which will mirror the terms of the Subordinated Debt Securities held by the
Trust and as described in the Prospectus Supplement related thereto.

     Reference is made to the Prospectus Supplement relating to the Preferred
Securities of the Trust for specific terms, including (i) the distinctive
designation of such Preferred Securities; (ii) the number of Preferred
Securities issued; (iii) the annual distribution rate or rates (or method of
determining such rate or rates) for Preferred Securities and the date or dates
upon which such distributions shall be payable; provided, however, that
distributions on such Preferred Securities shall be payable on a periodic basis
to holders of such Preferred Securities as of a record date in each period
during which such Preferred Securities are outstanding; (iv) whether
distributions on Preferred Securities shall be cumulative, and, in the case of
Preferred Securities having such cumulative distribution rights, the date or
dates or method of determining the date or dates from which distributions on
Preferred Securities shall be cumulative; (v) the obligation or option, if any,
of the Trust to purchase or redeem Preferred Securities and the price or prices
at which, the period or periods within which, and the terms and conditions upon
which, Preferred Securities shall be purchased or redeemed, in 


                                      -33-

<PAGE>

whole or in part, pursuant to such obligation or option (with such redemption 
price to be determined through negotiations among the Company and the 
underwriters based on, among other factors, redemption prices of securities 
similar to the Preferred Securities and market conditions generally); (vi) 
the terms and conditions, if any, upon which the Subordinated Debt Securities 
may be distributed to holders of Preferred Securities; (vii) if applicable, 
any securities exchange upon which the Preferred Securities shall be listed; 
(viii) whether the Preferred Securities are to be issued in whole or in part 
in book-entry form and represented by one or more global certificates, and if 
so, the identity of the depository for such global certificates and the 
specific terms of the depository arrangements therefor; and (ix) any other 
relevant rights, preferences, privileges, limitations or restrictions of 
Preferred Securities not inconsistent with the Declaration or with applicable 
law.  The Preferred Securities will be guaranteed by the Company to the 
extent set forth below under "DESCRIPTION OF THE PREFERRED SECURITIES 
GUARANTEE".  The Preferred Securities Guarantee of the Company, when taken 
together with the Company's obligations under the Subordinated Debt 
Securities and the relevant Supplemental Indenture, and its obligations under 
the Declaration, including obligations to pay costs, expenses, debts and 
liabilities of the Trust (other than with respect to the Trust Securities), 
would provide a full and unconditional guarantee of amounts due on Preferred 
Securities issued by the Trust.  Certain United States federal income tax 
considerations applicable to any offering of Preferred Securities will be 
described in the Prospectus Supplement relating thereto.

     In connection with the issuance of Preferred Securities, the Trust will
issue one series of Common Securities.  The Declaration authorizes the
Administrative Trustee to issue on behalf of the Trust one series of Common
Securities having such terms including distributions, redemption, voting,
liquidation rights or such restrictions as shall be set forth therein.  The
terms of the Common Securities will be substantially identical to the terms of
the Preferred Securities issued by the Trust and the Common Securities will rank
PARI PASSU, and payments will be made thereon pro rata with the Preferred
Securities except that, upon the occurrence and during the continuance of an
event of default under the Declaration, the rights of the holders of the Common
Securities to payment in respect of distributions and payments upon liquidation,
redemption and otherwise will be subordinated to the rights of the holders of
the Preferred Securities.  Except in certain limited circumstances, the Common
Securities will also carry the right to vote to appoint, remove or replace any
of the PSCO Trustees.  All of the Common Securities of the Trust will be
directly or indirectly owned by the Company.

     LIQUIDATION DISTRIBUTION UPON DISSOLUTION:  Pursuant to the Declaration,
the Trust shall be dissolved on the earliest to occur of: (i) the expiration of
the term of the Trust; (ii) the bankruptcy, dissolution or liquidation of the
Company or an acceleration of the maturity of the corresponding series of
Subordinated Debt Securities held by the Trust; (iii) if provided for in the
accompanying Prospectus Supplement, upon the election of the Company to dissolve
the Trust and, after satisfaction of liabilities to creditors of the Trust,
cause the distribution of the corresponding series of Subordinated Debt
Securities to the holders of the Trust Securities; (iv) the redemption of all of
the Trust Securities; and (v) an order for the dissolution of the Trust shall
have been entered by a court of competent jurisdiction.  The election of the
Company pursuant to clause (iii) above shall be made by the Company giving
written notice to the PSCO Trustees not less than 30 days prior to the date of
distribution of the corresponding series of Subordinated Debt Securities 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.

     If a dissolution event occurs as described in clause (i), (ii), (iii) or
(v) above with respect to the Trust, the Trust shall be liquidated by the PSCO
Trustees as expeditiously as the PSCO Trustees determine to be possible by
distributing, after satisfaction of liabilities to creditors of the Trust as
provided by applicable law, to the holders of its Trust Securities a like amount
of the Subordinated Debt Securities held by the Trust, unless such distribution
is determined by the Property Trustee not to be practical, in which event such
holders will be entitled to receive out of the assets of the Trust available for
distribution to holders, after satisfaction of liabilities to creditors of the
Trust as provided by applicable law, an amount equal to, in the case of holders
of Trust Securities, the aggregate liquidation amount per Trust Security
specified in the accompanying Prospectus 


                                      -34-

<PAGE>

Supplement plus accumulated and unpaid distributions thereon to the date of 
payment (such amount, the "Liquidation Distribution").  If the Liquidation 
Distribution with respect to the Preferred Securities can be paid only in 
part because the Trust has insufficient assets available to pay in full the 
aggregate Liquidation Distribution, then the amounts payable by the Trust on 
such Preferred Securities shall be paid on a pro rata basis.  The holders of 
the Trust's Common Securities will be entitled to receive the Liquidation 
Distribution upon any such liquidation pro rata with the holders of its 
Preferred Securities, except that if a Declaration Event of Default (defined 
below) has occurred and is continuing the Preferred Securities shall have a 
priority over the Common Securities with respect to payment of such 
Liquidation Distribution.

     DECLARATION EVENT OF DEFAULT; NOTICE:  An Event of Default under the
Subordinated Debt Securities Indenture relating to the Subordinated Debt
Securities held by the Trust shall constitute a Declaration Event of Default
with respect to the Preferred Securities issued by the Trust under the
Declaration.

     Within 90 days after the occurrence of any Declaration Event of Default
actually known to the Property Trustee, the Property Trustee shall transmit
notice of such Declaration Event of Default to the holders of the Trust
Securities, the Administrative Trustee and the Company, unless such Declaration
Event of Default shall have been cured or waived.  The Company and the
Administrative Trustee are required to file annually with the Property Trustee a
certificate as to whether or not they are in compliance with all the conditions
and covenants applicable to them under the Declaration.

     Under the Declaration, if the Property Trustee has failed to enforce its
rights under the Declaration or the Subordinated Debt Securities Indenture, to
the fullest extent permitted by law and subject to the terms of the Declaration
and the Subordinated Debt Securities Indenture, any holder of the corresponding
Preferred Securities may institute a legal proceeding directly to enforce the
Property Trustee's rights under the Declaration or the Subordinated Debt
Securities Indenture with respect to Subordinated Debt Securities having a
principal amount equal to the aggregate liquidation amount of the Preferred
Securities of such holder without first instituting a legal proceeding against
the Property Trustee or any other person.  To the extent that any action under
the Subordinated Debt Securities Indenture is entitled to be taken by the
holders of at least a specified percentage of the principal amount of a series
of Subordinated Debt Securities, holders of the corresponding Preferred
Securities may take such action if such action is not taken by the Property
Trustee.   Notwithstanding the foregoing, if a Declaration Event of Default
attributable to the Company's failure to pay principal of or premium, if any, or
interest on the Subordinated Debt Securities held by the Trust has occurred and
is continuing, then each holder of Preferred Securities may institute a legal
proceeding directly against the Company for enforcement of any such payment to
such holder, all as provided in the Subordinated Debt Securities Indenture and
the Supplemental Indenture thereunder relating to the Subordinated Debt
Securities purchased by the Trust.


     REMOVAL OF PSCO TRUSTEES:  Unless a Declaration Event of Default has
occurred and is continuing, any PSCO Trustee may be removed and replaced at any
time by the holder of the Common Securities.  If a Declaration Event of Default
has occurred and is continuing, the Property Trustee and the Delaware Trustee
may be removed and replaced at such time only by the holders of at least a
majority in aggregate liquidation amount of the outstanding Preferred
Securities.  In no event will the holders of the Preferred Securities have the
right to vote to appoint, remove or replace the Administrative Trustee, which
voting rights are vested exclusively in the holder of the Common Securities.  No
resignation or removal of PSCO Trustee and no appointment of a successor trustee
shall be effective until the acceptance of appointment by the successor trustee
in accordance with the provisions of the Declaration.

     CO-TRUSTEES AND SEPARATE PROPERTY TRUSTEE:  Unless a Declaration Event of
Default has occurred and is continuing, at any time and from time to time, for
the purpose of meeting the legal requirements of the Trust Indenture Act or of
any jurisdiction in which any part of the Trust Property (as defined in the
Declaration) may at such time be located, the holder of the Common Securities
and the Administrative Trustee 


                                      -35-

<PAGE>

shall have the power (i) 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 act as separate 
trustee of any such Trust 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 such capacity any property, title, right or power deemed necessary 
or desirable, subject to the provisions of the Declaration.  If a Declaration 
Event of Default has occurred and is continuing, only the Property Trustee 
shall have power to make such appointment.

     MERGER OR CONSOLIDATION OF ISSUER TRUSTEES:  Any corporation or other
entity into which any PSCO Trustee may be merged or converted or with which it
may be consolidated, or any corporation or other entity resulting from any
merger, conversion or consolidation to which any PSCO Trustee shall be a party,
or any corporation or other entity succeeding to all or substantially all the
corporate trust business of any PSCO Trustee, shall be the successor of such
PSCO Trustee under the applicable Declaration, provided such corporation or
other entity shall be otherwise qualified and eligible.

     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 corporation or other entity, except as
described below or in "Liquidation Distribution Upon Dissolution".  The Trust
may, at the request of the Company, with the consent of the Administrative
Trustee and without the consent of the holders of its 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
such Preferred Securities or (b) substitutes for such Preferred Securities other
securities substantially similar to such Preferred Securities (the "Successor
Securities") so long as the Successor Securities rank the same as such Preferred
Securities rank with respect to the payment of Distributions and payments upon
redemption and liquidation, (ii) the Company expressly appoints a trustee of
such successor entity possessing the same powers and duties as the Property
Trustee with respect to the corresponding series of Subordinated Debt
Securities, (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 such Preferred Securities are
then listed, (iv) such merger, consolidation, amalgamation or replacement does
not cause such 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 such 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
Company has received an opinion of counsel to the Trust to the effect that (a)
such merger, consolidation, amalgamation or replacement does not adversely
affect the rights, preferences and privileges of the holders of such 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 under the Investment Company Act of 1940, as amended (the "Investment
Company Act"), and (viii) the Company 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 Preferred Securities Guarantee and Declaration.
Notwithstanding the foregoing, the Trust shall not, except with the consent of
all holders of its Preferred Securities, consolidate, amalgamate, merge with or
into, 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 federal income tax
purposes.

     VOTING RIGHTS; AMENDMENT OF TRUST AGREEMENT:  Except as provided below and
under "Mergers, Consolidations, Amalgamations or Replacements of the Trust" and
"DESCRIPTION OF THE GUARANTEE--Amendments and Assignment" and as otherwise
required by law and the Declaration, the holders of the Preferred Securities
will have no voting rights.


                                      -36-

<PAGE>

     The Declaration may be amended from time to time by the Company and the
PSCO Trustees, without the consent of the holders of the corresponding Preferred
Securities, (i) to cure any ambiguity, defect or inconsistency or (ii) to make
any other change that does not adversely affect in any material respect the
interests of any holder of such Preferred Securities.  The Declaration may be
amended by the Company and the PSCO Trustees in any other respect, with the
consent of the holders of at least a majority in aggregate liquidation amount of
such Preferred Securities, except to (i) change the amount, timing or currency
or otherwise adversely affect the method of payment of any distribution or
Liquidation Distribution on the Trust Securities, (ii) restrict the right of a
holder of any such Preferred Security to institute suit for enforcement of any
distribution, Redemption Price or Liquidation Distribution on the Trust
Securities, (iii) change the purpose of the Trust, (iv) authorize the issuance
of any additional beneficial interests in the Trust, (v) change the redemption
provisions of the Trust Securities, (vi) change the conditions precedent for the
Company to elect to dissolve the Trust and distribute the Subordinated Debt
Securities to the holders of such Trust Securities or (vii) affect the limited
liability of any holder of such Preferred Securities, which amendment requires
the consent of each holder of the related Preferred Securities affected thereby.
Notwithstanding the foregoing, no amendment may be made without receipt by the
Trust of an opinion of counsel to the effect that such amendment will not affect
the Trust's status as a grantor trust for federal income tax purposes or its
exemption from regulation as an investment company under the Investment Company
Act.


     The PSCO Trustees shall not (i) direct the time, method and place of
conducting any proceeding for any remedy available to the Subordinated Debt
Securities Indenture Trustee or executing any trust or power conferred on the
Subordinated Debt Securities Indenture Trustee with respect to the Subordinated
Debt Securities held by the Trust, (ii) waive any past default pursuant to
Section 513 of the Subordinated Debt Securities Indenture, (iii) exercise any
right to rescind or annul an acceleration of the principal of such Subordinated
Debt Securities, or (iv) consent to any amendment or modification of the
Subordinated Debt Securities 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 a consent under the Subordinated Debt
Securities Indenture would require the consent of each holder of Subordinated
Debt Securities affected thereby, no such consent shall be given by the Property
Trustee without the prior consent of each holder of the Preferred Securities. 
The PSCO Trustees shall not revoke any action previously authorized or approved
by a vote of the holders of such Preferred Securities except by subsequent vote
of the holders thereof.  The Property Trustee shall notify all holders of
Preferred Securities of any notice received from the Subordinated Debt
Securities Indenture Trustee as a result of the Trust being the holder of the
Subordinated Debt Securities.  In addition to obtaining the consent of the
holders of the Preferred Securities, prior to taking any of the foregoing
actions, the PSCO Trustees shall obtain an opinion of counsel to the effect that
the Trust will not be classified as an association taxable as a corporation or a
partnership for federal income tax purposes on account of such action and will
continue to be classified as a grantor trust for federal income tax purposes.

     Any required consent of holders of Preferred Securities may be given at a
meeting of holders of such Preferred Securities convened for such purpose or
pursuant to written consent.  The Property Trustee will cause a notice of any
meeting at which holders of Preferred Securities are entitled to vote, or of any
matter upon which action by written consent of such holders is to be taken, to
be given to each holder of record of such Preferred Securities in the manner set
forth in the Declaration.

     Notwithstanding that holders of Preferred Securities are entitled to vote
or consent under certain circumstances, any Preferred Securities that are owned
by the Company, the PSCO Trustees or any affiliate of the Company or any PSCO
Trustee shall, for purposes of such vote or consent, be treated as if they were
not outstanding.

     INFORMATION CONCERNING THE PROPERTY TRUSTEE:  The Property Trustee is the
sole trustee under the Declaration for purposes of the Trust Indenture Act and
shall have and be subject to all of the duties and responsibilities specified
with respect to an indenture trustee under the Trust Indenture Act.  The
Property 


                                      -37-

<PAGE>

Trustee, other than during the occurrence and continuance of a Declaration 
Event of Default, undertakes to perform only such duties as are specifically 
set forth in the Declaration and, upon a Declaration Event of Default, must 
use the same degree of care and skill in the exercise thereof as a prudent 
person would exercise or use in the conduct of his or her own affairs. 
Subject to this provision, the Property Trustee is under no obligation to 
exercise any of the powers vested in it by the Declaration at the request of 
any holder of Preferred Securities unless it is offered reasonable security 
or indemnity against the costs, expenses and liabilities that might be 
incurred thereby.  If no Declaration Event of Default has occurred and is 
continuing, and the Property Trustee is required to decide between 
alternative courses of action, construe ambiguous provisions in the 
Declaration or is unsure of the application of any provision of the 
Declaration, and the matter is not one on which holders of Preferred 
Securities are entitled under the Declaration to vote, then the Property 
Trustee shall take such action as is directed by the Company and, if not so 
directed, may take such action as it deems advisable and in the best 
interests of the holders of the Trust Securities and will have no liability 
except for its own negligent action, negligent failure to act or willful 
misconduct.

     MISCELLANEOUS:  The Administrative Trustee is authorized and directed to
conduct the affairs of and to operate the Trust in such a way that (i) it will
not be deemed to be an "investment company" required to be registered under the
Investment Company Act or to be taxed as a corporation or partnership for
federal income tax purposes, (ii) it will be classified as a grantor trust for
federal income tax purposes and (iii) the Subordinated Debt Securities held by
it will be treated as indebtedness of the Company for federal income tax
purposes.  In this connection, the Company and the Administrative Trustee are
authorized to take any action, not inconsistent with applicable law, the
certificate of trust of the Trust or the Declaration, that the Company and the
Administrative Trustee determine in their discretion to be necessary or
desirable for such purposes, even if such action adversely affects the interests
of the holders of the Preferred Securities.

     Holders of the Preferred Securities have no preemptive or similar rights. 
The Trust may not borrow money, issue debt, execute mortgages or pledge any of
its assets.

     Except as otherwise provided in the Declaration, any action requiring the
consent or vote of the PSCO Trustees shall be approved by the Administrative
Trustee.

     GOVERNING LAW:  The Declaration will be governed by and construed in
accordance with the laws of the State of Delaware.

                  DESCRIPTION OF THE PREFERRED SECURITIES GUARANTEE

     The Preferred Securities Guarantee will be executed and delivered by the
Company concurrently with the issuance by the Trust of its Preferred Securities
for the benefit of the holders from time to time of such Preferred Securities. 
The Preferred Securities Guarantee will be qualified as an indenture under the
Trust Indenture Act and The Bank of New York will act as indenture trustee (the
"Preferred Securities Guarantee Trustee") under the Preferred Securities
Guarantee for the purposes of compliance with the Trust Indenture Act.  The
Preferred Securities Guarantee Trustee will hold the Preferred Securities
Guarantee for the benefit of the holders of the Preferred Securities issued by
the Trust.  The following summary of the Preferred Securities Guarantee does not
purport to be complete and is qualified in its entirety by the detailed
provisions of the Preferred Securities Guarantee, a form of which is filed as an
exhibit to the Registration Statement of which this Prospectus is a part. 
Capitalized terms used under this heading and not otherwise defined hereunder
shall have the meanings ascribed thereto in the Preferred Securities Guarantee. 
Whenever particular provisions or terms defined therein are referred to herein,
such provisions or definitions are incorporated by reference as part of the
statements made herein and such statements are qualified in their entirety by
such reference.

     GENERAL:  The Company will irrevocably agree, to the extent set forth in
the Preferred Securities Guarantee, to pay in full, to the holders of the
Preferred Securities issued by the Trust, the Preferred 


                                      -38-

<PAGE>

Securities Guarantee Payments (as defined  below) (except to the extent 
previously paid), as and when due, regardless of any defense, right of 
set-off or counterclaim which the Trust may have or assert.  The following 
payments, to the extent not paid by the Trust (the "Preferred Securities 
Guarantee Payments"), will be subject to the Preferred Securities Guarantee 
(without duplication): (i) any accumulated and unpaid Distributions required 
to be paid on such Preferred  Securities, to the extent that the Trust has 
funds available therefor, (ii) the redemption price (the "Redemption Price") 
and all accrued and unpaid Distributions to the date of redemption to the 
extent that the Trust has funds available therefor, and (iii) upon a 
voluntary or involuntary dissolution and liquidation of the Trust (other than 
in connection with a distribution of Subordinated Debt Securities to holders 
of such Preferred Securities or the redemption of all such Preferred 
Securities), the lesser of (a) the aggregate of the liquidation amount 
specified in the Prospectus Supplement per Preferred Security plus all 
accrued and unpaid Distributions on the Preferred Securities to the date of 
payment, to the extent the Trust has funds available therefor and (b) the 
amount of assets of the Trust remaining available for distribution  to 
holders of Preferred Securities upon a dissolution and liquidation of the 
Trust (the "Liquidation Payment").  The Company's obligation to make a 
Preferred Securities Guarantee Payment may be satisfied by direct payment of 
the required amounts by the Company to the holders of the Preferred 
Securities or by causing the Trust to pay such amounts to such holders.  
While the assets of the Company will not be available pursuant to the 
Preferred Securities Guarantee for the payment of any distribution, 
Liquidation Payment or Redemption Price on any Preferred Securities if the 
Trust does not have funds available therefor as described above, the Company 
has agreed under the Declaration to pay all expenses of the Trust except the 
Trust's obligations under its Preferred Securities.  Accordingly, the 
Preferred Securities Guarantee, together with the backup undertakings 
consisting of the Company's obligations under the Declaration, the 
corresponding series of Subordinated Debt Securities and the relevant 
Supplemental Indenture provide for the Company's full and unconditional 
guarantee of the Preferred Securities.

     No single document executed by the Company in connection with the 
issuance of the Preferred Securities will provide for the Company's full and 
unconditional Preferred Securities Guarantee of the Preferred Securities.   
It is only the combined operation of the Company's obligations under the 
Preferred Securities Guarantee, the Declaration, the corresponding series of 
Subordinated Debt Securities and the relevant Supplemental Indenture that has 
the effect of providing a full and unconditional guarantee of the Trust's 
obligations under its Preferred Securities.

     STATUS OF THE PREFERRED SECURITIES GUARANTEE:  The Preferred Securities
Guarantee will constitute an unsecured obligation of the Company and will rank
(a) subordinate and junior in right of payment to all general liabilities of the
Company, (b) PARI PASSU with the senior most preferred stock now or hereafter
issued by the Company and with any guarantee now or hereafter issued by the
Company in respect of preferred stock of any affiliate of the Company and (c)
senior to the Company's common stock.  The Declaration provides that each holder
of Preferred Securities by acceptance thereof agrees to the subordination
provisions and other terms of the Preferred Securities Guarantee.  The Preferred
Securities Guarantee will constitute a guarantee  of payment and not of
collection (i.e., the guaranteed party may institute a legal proceeding directly
against the Company to enforce its rights under the Preferred Securities
Guarantee without first instituting a legal proceeding against any other person
or entity).  The Preferred Securities Guarantee will not be discharged except by
payment of the Preferred Securities 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 Subordinated Debt Securities pursuant to the
Declaration.

     AMENDMENTS AND ASSIGNMENT:  Except with respect to any changes which do not
adversely affect the rights of holders of the Preferred Securities in any
material respect (in which case no consent of the holders will be required), the
Preferred Securities Guarantee may not be amended without the prior approval of
the holders of at least a majority in aggregate liquidation amount of the
Preferred Securities (excluding any Preferred Securities held by the Company or
an affiliate thereof).  The manner of obtaining any such approval will be as set
forth under "DESCRIPTION OF THE PREFERRED SECURITIES OF THE TRUST -- Voting
Rights; Amendment of Trust Agreement".  All guarantees and agreements contained
in the Preferred Securities 


                                      -39-

<PAGE>

Guarantee shall bind the successors, assigns, receivers, trustees and 
representatives of the Company and shall inure to the benefit of the holders 
of the Preferred Securities.

     PREFERRED SECURITIES GUARANTEE EVENTS OF DEFAULT:  An event of default
under the Preferred Securities Guarantee (a "Preferred Securities Guarantee
Event of Default") will occur upon the failure of the Company to perform any of
its payment or other obligations thereunder, provided that except with respect
to the Preferred Securities Guarantee Event of Default resulting from a failure
to make any of the Preferred Securities Guarantee Payments, the Company shall
have received notice of such Preferred Securities Guarantee Event of Default
from the Preferred Securities Guarantee Trustee and shall not have cured such
Preferred Securities Guarantee Event of Default within 60 days after receipt of
such notice.  The holders of at least a majority in aggregate liquidation amount
of the Preferred Securities (excluding any Preferred Securities held by the
Company or an affiliate thereof) will have the right to direct the time, method
and place of conducting any proceeding for any remedy available to the Preferred
Securities Guarantee Trustee in respect of such Preferred Securities Guarantee
or to direct the exercise of any trust or power conferred upon the Preferred
Securities Guarantee Trustee under the Preferred Securities Guarantee.

     Any holder of the Preferred Securities may institute a legal proceeding
directly against the Company to enforce such holder's rights under the Preferred
Securities Guarantee without first instituting a legal proceeding against the
Trust, the Preferred Securities Guarantee Trustee or any other person or entity.

     INFORMATION CONCERNING THE PREFERRED SECURITIES GUARANTEE TRUSTEE:  The
Preferred Securities Guarantee Trustee, other than during the occurrence and
continuance of a Preferred Securities Guarantee Event of Default, undertakes to
perform only such duties as are specifically set forth in the Preferred
Securities Guarantee and, after a Preferred Securities Guarantee Event of
Default, to exercise the same degree of care and skill in the exercise thereof
as a prudent person would exercise or use in the conduct of his or her own
affairs.  Subject to this provision, the Preferred Securities Guarantee Trustee
is under no obligation to exercise any of the powers vested in it by the
Preferred Securities Guarantee at the request of any holder of Preferred
Securities unless it is offered reasonable indemnity against the costs, expenses
and liabilities that might be incurred thereby.

     TERMINATION OF THE PREFERRED SECURITIES GUARANTEE:  The Preferred
Securities Guarantee will terminate and be of no further force and effect upon
full payment of the Redemption Price or Liquidation Payment for the Preferred
Securities or upon distribution of the corresponding series of Subordinated Debt
Securities to the holders of the Preferred Securities.  The 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 the Preferred Securities
Guarantee.

     GOVERNING LAW:  The Preferred Securities Guarantee will be governed by and
construed in accordance with the laws of the State of New York.

                     RELATIONSHIP AMONG THE PREFERRED SECURITIES,
                          THE PREFERRED SECURITIES GUARANTEE
                AND THE SUBORDINATED DEBT SECURITIES HELD BY THE TRUST

     Payments of Distributions and redemption and liquidation payments due on
the Preferred Securities (to the extent the Trust has funds available for such
payments) will be guaranteed by the Company as and to the extent set forth under
"DESCRIPTION OF THE PREFERRED SECURITIES GUARANTEE".  No single document
executed by the Company in connection with the issuance of the Preferred
Securities will provide for the Company's full, irrevocable and unconditional
guarantee of the Preferred Securities.  It is only the combined operation of the
Company's obligations under the Preferred Securities Guarantee, the Declaration,
the corresponding series of Subordinated Debt Securities and the Indenture that
has the effect of providing a full, irrevocable and unconditional guarantee of
the Trust's obligations under its Preferred Securities.


                                      -40-

<PAGE>

     A holder of any Preferred Security may institute a legal proceeding
directly against the Company to enforce its rights under the Preferred
Securities Guarantee without first instituting a legal proceeding against the
Preferred Securities Guarantee Trustee, the Trust or any other person or entity.

     As long as the Company makes payments of interest and other payments when
due on the Subordinated Debt Securities held by the Trust, such payments will be
sufficient to cover the payment of Distributions and redemption and Liquidation
Distributions due on the Preferred Securities, primarily because (i) the
aggregate principal amount of such Subordinated Debt Securities will be equal to
the sum of the aggregate liquidation amount of the Preferred Securities and
Common Securities, (ii) the interest rate and interest and other payment dates
on such Subordinated Debt Securities will match the Distribution rate and
Distribution and other payment dates for the Preferred Securities, (iii) the
Declaration provides that the Company shall pay for all and any costs, expenses
and liabilities of the Trust of such Preferred Securities except the Trust's
obligations under the Preferred Securities, and (iv) the Declaration provides
that the Trust will not engage in any activity that is not consistent with the
limited purposes of the Trust.  If and to the extent that the Company does not
make payments on such Subordinated Debt Securities, the Trust will not have
funds available to make payments of Distributions or other amounts due on the
Preferred Securities.

     A principal difference between the rights of a holder of a Preferred
Security (which represents an undivided beneficial interest in the assets of the
Trust thereof) and a holder of a Subordinated Debt Security is that a holder of
a Subordinated Debt Security will accrue, and (subject to the permissible
extension of the interest payment period) is entitled to receive, interest on
the principal amount of Subordinated Debt Securities held, while a holder of
Preferred Securities is entitled to receive Distributions only if and to the
extent the Trust has funds available for the payment of such Distributions.

     Upon any voluntary or involuntary dissolution or liquidation of the Trust
not involving a distribution of the Subordinated Debt Securities held by the
Trust, after satisfaction of liabilities to creditors of the Trust, the  holders
of the Preferred Securities will be entitled to receive, out of assets held by
the Trust, the Liquidation Distribution in cash.  See "DESCRIPTION OF THE
PREFERRED SECURITIES OF THE TRUST -- Liquidation Distribution Upon Dissolution".
Upon any voluntary liquidation or bankruptcy of the Company, the Trust, as
holder of the Subordinated Debt Securities, would be a creditor of the Company,
subordinated in right of payment to all Senior Indebtedness, but entitled to
receive payment in full of principal, premium, if any, and interest, before any
stockholders of the Company receive payments or distributions.

     A default or event of default under any Senior Indebtedness would not
constitute an Event of Default under the Subordinated Debt Securities Indenture.
However, in the event of payment defaults under, or  acceleration of, Senior
Indebtedness, the subordination provisions of the Subordinated Debt Securities
provide that no payments may be made in respect of the Subordinated Debt
Securities until such Senior Indebtedness has been paid in full or any payment
default thereunder has been cured or waived.  Failure to make required payments
on any series of Subordinated Debt Securities would constitute an Event of
Default under the Subordinated Debt Securities.

                              VALIDITY OF THE SECURITIES

     Except as set forth below, the validity of the Offered Securities of the
Company will be passed upon for the Company by LeBoeuf, Lamb, Greene & MacRae,
L.L.P., a limited liability partnership including professional corporations, New
York, New York.  Certain legal matters in connection with the Offered Securities
will be passed upon for the underwriters by Cahill Gordon & Reindel, a
partnership including a professional corporation, New York, New York.  Certain
matters of Delaware law relating to the validity of the Preferred Securities
will be passed upon on behalf of the Trust by Richards, Layton & Finger, P.A.,
Wilmington, Delaware, special Delaware counsel to the Trust.  Certain United
States federal income taxation matters will be passed upon for the Company and
the Trust by LeBoeuf, Lamb, Greene & MacRae, L.L.P, special tax counsel to the
Company and the Trust.  All legal matters pertaining to title and the respective
liens 


                                      -41-

<PAGE>

of the 1993 Mortgage and the 1939 Mortgage will be passed upon only by 
LeBoeuf, Lamb, Greene & MacRae, L.L.P.  Cahill Gordon & Reindel from time to 
time renders legal services to the Company.  In giving their opinion, Cahill 
Gordon & Reindel may rely as to all matters of Colorado law upon the opinion 
of LeBoeuf, Lamb, Greene & MacRae, L.L.P.

                                       EXPERTS

     The consolidated balance sheets and statements of capitalization of the
Company and its subsidiaries as of December 31, 1997 and 1996, and the related
consolidated statements of income, shareholders' equity and cash flows for each
of the three years in the period ended December 31, 1997, and the related
financial statement schedule, included in the Company's Annual Report on Form
10-K for the year ended December 31, 1997, included in the New Century Energies,
Inc. combined Annual Report on Form 10-K for the year ended December 31, 1997,
which statements and schedule are incorporated by reference in this Registration
Statement, have been audited by Arthur Andersen LLP, independent public
accountants, as set forth in their reports with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said reports.

                                 PLAN OF DISTRIBUTION

     The Company and/or the Trust may sell the Offered Securities:  (i) directly
to purchasers, (ii) to or through underwriters, or (iii) through agents or
dealers.  The Prospectus Supplement with respect to the Offered Securities will
set forth the terms of the offering of the Offered Securities, including the
name or names of any such underwriters, agents or dealers; the purchase price of
the Offered Securities and the net proceeds to the Company and/or the Trust from
such sale; any underwriting discounts and commissions or agency fees and other
items constituting underwriters' or agents' compensation; the initial public
offering price; any discounts or concessions allowed or reallowed or paid to
dealers and any securities exchange on which such Offered Securities may be
listed.  Any initial public offering price and any discounts or concessions
allowed or reallowed or paid to dealers may be changed from time to time.

     If underwriters are used in any sale, the Offered Securities will be
acquired by such underwriters for their own account and may be resold from time
to time in one or more transactions, including negotiated transactions, at a
fixed public offering price or at varying prices determined at the time of sale.
The Offered Securities may be offered to the public either through underwriting
syndicates represented by one or more managing underwriters or directly by one
or more firms acting as underwriters.  The underwriter or underwriters with
respect to a particular underwritten offering of Offered Securities will be
named in the Prospectus Supplement relating to such offering and, if an
underwriting syndicate is used, the managing underwriter or underwriters will be
set forth on the cover of such Prospectus Supplement.  Unless otherwise set
forth in the Prospectus Supplement relating thereto, the obligations of the
underwriters to purchase the Offered Securities will be subject to certain
conditions precedent, and the underwriters will be obligated to purchase all the
Offered Securities if any are purchased.

     If dealers are utilized in a sale of Offered Securities, the Company and/or
the Trust will sell such Offered Securities to the dealers as principal.  The
dealers may then resell such Offered Securities to the public at varying prices
to be determined by such dealers at the time of resale.  The names of the
dealers and the terms of the transaction will be set forth in the Prospectus
Supplement relating thereto.

     The Offered Securities may be sold directly by the Company and/or the Trust
or through agents designated by the Company and/or the Trust from time to time. 
Any agent involved in the offer or sale of the Offered Securities in respect to
which this Prospectus is delivered will be named, and any commissions payable by
the Company and/or the Trust to such agent will be set forth in the Prospectus
Supplement relating thereto.  Unless otherwise indicated in the Prospectus
Supplement, any such agent will be acting on a best efforts basis for the period
of its appointment.



                                      -42-

<PAGE>

     Agents, dealers and underwriters may be entitled under agreements with the
Company and/or the Trust to indemnification by the Company and/or the Trust
against certain civil liabilities, including liabilities under the Securities
Act, or to contribution with respect to payments which such agents, dealers or
underwriters may be required to make in respect thereof.  Agents, dealers and
underwriters may be customers of, engage in transactions with, or perform
services for the Company and/or the Trust in the ordinary course of business.























                                      -43-

<PAGE>


                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
<TABLE>
<S>  <C>                                                                     <C>
     Securities and Exchange Commission Registration Fee . . . . . . . . . . $  132,750
     NYSE Listing Fee. . . . . . . . . . . . . . . . . . . . . . . . . . . .     95,100
     Blue Sky Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     15,000
*    Accountants' Fees and Expenses. . . . . . . . . . . . . . . . . . . . .     25,000
*    Company Counsel's Fees and Expenses . . . . . . . . . . . . . . . . . .    350,000
*    Trustees' Fees and Expenses, including Counsel and  
     Authentication Fees . . . . . . . . . . . . . . . . . . . . . . . . . .     90,000
*    Printing of Registration Statement, Prospectus, Prospectus
          Supplements, Supplemental Indentures, etc. . . . . . . . . . . . .    250,000
*    Rating Agencies' Fees . . . . . . . . . . . . . . . . . . . . . . . . .    150,000
*    Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    100,000
                                                                             ----------
     *Total Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,207,850 
                                                                             ----------
                                                                             ----------
</TABLE>
- ------------------------
*Estimated

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Sections 7-108-402, 7-109-102, 7-109-103, 7-109-104, 7-109-105, 7-109-106,
7-109-107, 7-109-108 and 7-109-109 of the Colorado Business Corporation Act
provide for indemnification of directors, officers, employees, fiduciaries and
agents of Colorado corporations such as the Registrant, subject to certain
limitations, and authorize such corporations to purchase and maintain insurance
on behalf of such persons against any liability incurred in any such capacity or
arising out of their status as such.  The Registrant currently has such
insurance in effect.

     A resolution adopted at a special meeting of stockholders of the Registrant
held in November, 1943, provides:  "That each Director and Officer of the
Company (or his legal representative) shall be indemnified by the Company
against all claims, liabilities, expenses and costs imposed upon or reasonably
incurred by him in connection with any action, suit or proceeding, or the
settlement or compromise of any such claim, liability, action, suit or
proceeding (other than amounts paid to the Company itself), in which he may be
involved by reason of his being or having been such Director or Officer of the
Company, except in relation to matters as to which he shall be finally adjudged
in any such action, suit or proceeding to have been derelict in the performance
of his duties as such Director or Officer, provided, however, in respect to any
such settlement or compromise that it shall have been determined, by a majority
of the Directors of the Company not affected by self interest, that such
settlement or compromise should be made, and that such Director or Officer had
not been derelict in the performance of his official duties; and provided
further that the foregoing indemnity shall not extend to or cover any claims,
liabilities, action, suit or proceeding under the Securities Act of 1933, or any
costs or expenses in connection therewith unless the Director or Officer of the
Company involved shall be finally adjudged in such action, suit or proceeding to
have been subject to no liability under said Act, or in case of settlement or
compromise, unless the Company shall have obtained an opinion of independent
counsel to the effect that he is not liable under said Act.  The foregoing right
of indemnification shall not be exclusive of any other right or rights to which
such Director or Officer may be entitled as a matter of law."

     Article V of the Registrant's Restated Articles of Incorporation, as
amended, provides:  "To the fullest extent permitted by [the Colorado
Corporation Code as the same exists or may hereafter be amended], a director of
this Corporation shall not be liable to the Corporation or its shareholders for
monetary damages for breach of fiduciary duty as a director.  Neither the
amendment, nor the repeal of this Article, nor the adoption 


                                      II-1

<PAGE>

of any provision of the Articles of Incorporation inconsistent with this 
Article, shall eliminate or reduce the protection afforded by this Article to 
a director of the Corporation with respect to any matter which occurred, or 
any cause of action, suit or claim which but for this Article would have 
accrued or arisen, prior to such amendment, repeal or adoption."  

     To the maximum extent permitted by law, the Company shall indemnify any
person who is or was a director, officer, agent, fiduciary or employee of the
Company against any claim, liability, loss or expense arising against or
incurred by such person as a result of circumstances, events, actions and
omissions occurring in such capacity.  The Company further shall have the
authority to maintain insurance at the Company's expense providing for such
indemnification, including insurance with respect to claims, liabilities, losses
and expenses against which the Company would not otherwise have the power to
indemnify such persons.

ITEM 16.  EXHIBITS.

     Exhibits are listed in the Exhibit Index on page II-5 hereof.

ITEM 17.  UNDERTAKINGS.

     The undersigned Registrant hereby undertakes:

     (1)  To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:  

               (i)    to include any prospectus required by Section 10(a)(3) of
the Securities Act of 1933, as amended (the "1933 Act");

               (ii)   to reflect in the Prospectus any facts or events 
arising after the effective date of the Registration Statement (or the most 
recent post-effective amendment thereof) which, individually or in the 
aggregate, represent a fundamental change in the information set forth in the 
Registration Statement. Notwithstanding the foregoing, any increase or 
decrease in volume of securities offered (if the total dollar value of 
securities offered would not exceed that which was registered) and any 
deviation from the low or high end of the estimated maximum offering range 
may be reflected in the form of prospectus filed with the Commission pursuant 
to Rule 424(b) if, in the aggregate, the changes in volume and price 
represent no more than a 20% change in the maximum aggregate offering price 
set forth in the "Calculation of Registration Fee" table in the effective 
Registration Statement; and

               (iii)  to include any material information with respect to the
plan of distribution not previously disclosed in the Registration Statement or
any material change to such information in the Registration Statement;

PROVIDED, HOWEVER, that paragraphs (1)(i) and (1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed by the Registrant pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), that are incorporated by reference in the Registration
Statement.

     (2)  That, for the purpose of determining any liability under the 1933 Act,
each such post-effective amendment shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.

     (3)  To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.


                                      II-2

<PAGE>

     (4)  That, for purposes of determining any liability under the 1933 Act,
each filing of the Registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the Exchange Act that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (5)  That, for purposes of determining any liability under the Securities
Act of 1933, the information omitted from the form of prospectus filed as part
of this Registration Statement in reliance upon Rule 430A and contained in a
form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
497(h) under the Securities Act shall be deemed to be part of this Registration
Statement as of the time it was declared effective.

     (6)  That, for the purpose of determining any liability under the
Securities Act of 1933, each post-effective amendment that contains a form of
prospectus shall be deemed to be a new Registration Statement relating to the
securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the 1933 Act may
be permitted to directors, officers and controlling persons of the Registrant
pursuant to the provisions under Item 15 above, or otherwise, the Registrant has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the 1933 Act and is,
therefore, unenforceable.  In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred
or paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer, or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the 1933 Act and will be governed by the final
adjudication of such issue.
















                                      II-3

<PAGE>


                               POWER OF ATTORNEY

     Each director and/or officer of the Registrant whose signature appears 
below hereby appoints Wayne H. Brunetti and R.C. Kelly and each of them 
severally, as his or her attorneys-in-fact to sign in his or her name and on 
his or her behalf, in any and all capacities stated below, and to file with 
the Securities and Exchange Commission, any and all amendments, including 
post-effective amendments, to this Registration Statement.

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing Form S-3 and has duly caused this Registration Statement
to be signed on its behalf by the undersigned, thereunto duly authorized, in the
City and County of Denver and the State of Colorado, on the 6th day of March,
1998.

                                        PUBLIC SERVICE COMPANY OF COLORADO

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

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated:

<TABLE>
Signature                                      Title                           Date
- ---------                                      -----                           ----
<S>                                            <C>                             <C>
/s/ Bill D. Helton
- ---------------------------------------        Director                        March 6, 1998
Bill D. Helton, Chairman of the Board  

/s/ Wayne H. Brunetti
- ---------------------------------------       Principal Executive Officer      March 6, 1998
Wayne H. Brunetti, President and Chief 
Executive Officer and Vice Chairman 
of the Board

/s/ Brian P. Jackson
- ---------------------------------------       Principal Financial Officer      March 6, 1998
Brian P. Jackson, Senior Vice President
and Chief Financial Officer

/s/ Teresa S. Madden
- ---------------------------------------       Principal Accounting Officer     March 6, 1998
Teresa S. Madden, Controller 

/s/ R.C. Kelly
- ---------------------------------------       Director                         March 6, 1998
R.C. Kelly, Executive Vice President   
and Director

/s/ Henry H. Hamilton
- ---------------------------------------       Director                         March 6, 1998
Henry H. Hamilton, Director

/s/ David M. Wilks
- ---------------------------------------       Director                         March 6, 1998
David M. Wilks, Director
</TABLE>



                                      II-4


<PAGE>




                                    SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, PSCO Capital
Trust I certifies that it has reasonable grounds to believe that it meets all of
the requirements for filing on Form S-3 and that it has duly caused this
Registration Statement to be signed on their behalf by the undersigned,
thereunto duly authorized, in the City and County of Denver and State of
Colorado on the 6th day of March, 1998.

                                         PSCO CAPITAL TRUST I

                                         By:  /s/ Nancy Felker
                                            --------------------------------
                                            Nancy Felker, as Trustee












                                      II-5
<PAGE>
                                       
                                 EXHIBIT INDEX

1(a)      Form of Bond Purchase Contract (to be filed under subsequent Form 
          8-K).

1(b)      Form of Agency Agreement with respect to the Medium Term Notes (to 
          be filed under subsequent Form 8-K).

1(c)      Form of Underwriting Agreement with respect to the Senior Debt 
          Securities (to be filed under subsequent Form 8-K).

1(d)      Form of Underwriting Agreement with respect to the Subordinated Debt
          Securities (to be filed under subsequent Form 8-K).

1(e)      Form of Underwriting Agreement with respect to the Preferred 
          Securities (to be filed under subsequent From 8-K).

3*        Amended and Restated Articles of Incorporation of the Registrant 
          dated September 19, 1997 (Form 10-K, December 31, 1997 - Exhibit 
          3(a)(1). 

4(a)(1)*  Indenture, dated as of December 1, 1939, providing for the issuance of
          First Mortgage Bonds (Form 10 for 1946-Exhibit (B-1)).

4(a)(2)*  Indentures supplemental to Indenture dated as of December 1, 1939:


<TABLE>
                    Previous Filing:                                       Previous Filing:
                     Form; Date or                                           Form; Date or      Exhibit
 Dated as of           File No.         Exhibit No.     Dated as of            File No.            No. 
- -------------      -----------------    -----------     -------------      ----------------     -------
<S>                <C>                  <C>             <C>                <C>                  <C>
Mar. 14, 1941          10, 1946            B-2          Apr. 21, 1970       8-K, Apr. 1970         1
 May 14, 1941          10, 1946            B-3          Sept. 1, 1970       8-K, Sept. 1970        2
Apr. 28, 1942          10, 1946            B-4          Feb. 1, 1971        8-K, Feb. 1971         2
Apr. 14,  1943         10, 1946            B-5          Aug. 1, 1972        8-K, Aug. 1972         2
Apr. 27, 1944          10, 1946            B-6          June 1, 1973        8-K, June 1973         1
Apr. 18, 1945          10, 1946            B-7          Mar. 1, 1974        8-K, Apr. 1974         2
Apr. 23, 1946         10-K, 1946           B-8          Dec. 1, 1974        8-K, Dec. 1974         1
 Apr. 9, 1947         10-K, 1946           B-9          Oct. 1, 1975        S-7, (2-60082)       2(b)(3)
 June 1, 1947       S-1, (2-7075)          7(b)         Apr. 28, 1976       S-7, (2-60082)       2(b)(4)
 Apr. 1, 1948       S-1, (2-7671)        7(b)(1)        Apr. 28, 1977       S-7, (2-60082)       2(b)(5)
 May 20, 1948       S-1, (2-7671)        7(b)(2)        Nov. 1, 1977        S-7, (2-62415)       2(b)(3)
 Oct. 1, 1948         10-K, 1948            4           Apr. 28, 1978       S-7, (2-62415)       2(b)(4)
Apr. 20, 1949         10-K, 1949            1           Oct. 1, 1978          10-K, 1978          D(1)
Apr. 24, 1950       8-K, Apr. 1950          1           Oct. 1, 1979        S-7, (2-66484)       2(b)(3)
Apr. 18, 1951       8-K, Apr. 1951          1           Mar. 1, 1980          10-K, 1980          4(c)
 Oct. 1, 1951       8-K, Nov. 1951          1           Apr. 28, 1981       S-16, (2-74923)       4(c)
Apr. 21, 1952       8-K, Apr. 1952          1           Nov. 1, 1981        S-16, (2-74923)       4(d)
 Dec. 1, 1952       S-9, (2-11120)       2(b)(9)        Dec. 1, 1981          10-K, 1981          4(c)
Apr. 15, 1953       8-K, Apr. 1953          2           Apr. 29, 1982         10-K, 1982          4(c)
April 19, 1954      8-K, Apr. 1954          1            May 1, 1983          10-K, 1983          4(c)
 Oct. 1, 1954       8-K, Oct. 1954          1           Apr. 30, 1984       S-3, (2-95814)        4(c)
Apr. 18, 1955       8-K, Apr. 1955          1           Mar. 1, 1985          10-K, 1985          4(c)
</TABLE>

                                     II-6
<PAGE>

<TABLE>
                    Previous Filing:                                       Previous Filing:
                     Form; Date or                                           Form; Date or      Exhibit
 Dated as of           File No.         Exhibit No.     Dated as of            File No.            No. 
- -------------      -----------------    -----------     -------------      ----------------     -------
<S>                <C>                  <C>             <C>                <C>                  <C>
Apr. 24, 1956         10-K, 1956            1           Nov. 1, 1986          10-K, 1986          4(c)
 May 1, 1957        S-9, (2-13260)       2(b)(15)        May 1, 1987          10-K, 1987          4(c)
April 10, 1958      8-K, Apr. 1958          1           July 1, 1990        S-3, (33-37431)       4(c)
 May 1, 1959        8-K, May 1959           2           Dec. 1, 1990          10-K, 1990          4(c)
Apr. 18, 1960       8-K, Apr. 1960          1           Mar. 1, 1992          10-K, 1992          4(d)
Apr. 19, 1961       8-K, Apr. 1961          1           Apr. 1, 1993      10-Q, June 30, 1993     4(a)
 Oct. 1, 1961       8-K, Oct. 1961          2           June 1, 1993      10-Q, June 30, 1993     4(b)
 Mar. 1, 1962       8-K, Mar. 1962         3(a)         Nov. 1, 1993        S-3, (33-51167)     4(a)(3)
 June 1, 1964       8-K, June 1964          1           Jan. 1, 1994          10-K, 1993        4(a)(3)
 May 1, 1966        8-K, May 1966           2           Sept. 2, 1994       8-K, Sept. 1994       4(a)
 July 1, 1967       8-K, July 1967          2            May 1, 1996      10-Q, June 30, 1996     4(a)
 July 1, 1968       8-K, July 1968          2           Nov. 1, 1996          10-K, 1996        4(a)(3)
Apr. 25, 1969       8-K, Apr. 1969          1           Feb. 1, 1997     10-Q, March 31, 1997     4(a)
</TABLE>

4(a)(3)   Form of Supplemental Indenture establishing series of First Mortgage
          Bonds under the Indenture, dated as of December 1, 1939.

4(b)(1)*  Indenture, dated as of October 1, 1993, providing for the issuance of
          First Collateral Trust Bonds (Form 10-Q, September 30, 1993 - Exhibit
          4(a)).

4(b)(2)*  Indentures supplemental to Indenture dated as of October 1, 1993:

<TABLE>
                                Previous Filing:
                                 Form; Date or
  Dated as of                       File No.                 Exhibit No.
- -----------------             --------------------           -----------
<S>                           <C>                            <C>
November 1, 1993                 S-3, (33-51167)               4(b)(2)
January 1, 1994                    10-K, 1993                  4(b)(3)
September 2, 1994                8-K, Sept. 1994                4(b)
May 1, 1996                    10-Q, June 30, 1996              4(b)
November 1, 1996                   10-K, 1996                  4(b)(3)
February 1, 1997              10-Q, March 31, 1997              4(b)
</TABLE>

4(b)(3)  Form of Supplemental Indenture establishing series of First Collateral
         Trust Bonds or Medium Term Notes under the Indenture, dated as of
         October 1, 1993.

4(c)     Form of Senior Debt Securities Indenture, providing for the issuance
         of Senior Debt Securities.

4(d)     Form of Subordinated Debt Securities Indenture, providing for the
         issuance of Subordinated Debt Securities.

4(e)     Form of Supplemental Indenture to Form of Subordinated Debt Securities
         Indenture establishing a series of Deferrable Interest Subordinated
         Debentures.

4(f)     Form of Junior Subordinated Debentures (included in Exhibit 4(e)).

                                     II-7
<PAGE>

4(g)     Form of Guarantee Agreement with respect to the Preferred Securities
         of PSCO Capital Trust I.

4(h)     Certificate of Trust of PSCO Capital Trust I.

4(i)     Declaration of Trust of PSCO Capital Trust I.

4(j)     Form of Amended and Restated Declaration of Trust of PSCO Capital
         Trust I.

4(k)     Form of Preferred Security (included in Exhibit 4(j).

5(a)     Opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P. regarding the
         validity of certain Offered Securities.

5(b)     Opinion of Richards, Layton & Finger, P.A. regarding the validity of
         the Preferred Securities under Delaware Law.

8(a)     Tax opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P. (to be filed
         under subsequent Form 8-K).

12       Computation of Ratio of Consolidated Earnings to Consolidated Fixed
         Charges.

23(a)    Consent of Arthur Andersen LLP.

23(b)    Consents of LeBoeuf, Lamb, Greene & MacRae, L.L.P. and Richards,
         Layton & Finger, P.A. are included in their opinions filed as Exhibits
         5(a) and 5(b), respectively.

24       The Power of Attorney is included on page II-4 hereof.

25(a)    Statement of Eligibility of First Trust of New York, National
         Association, as successor Trustee under the Indenture, dated as of
         October 1, 1993.

25(b)    Statement of Eligibility of The Bank of New York, as Trustee under the
         Senior Debt Securities Indenture.

25(c)    Statement of Eligibility of The Bank of New York, as Trustee under the
         Subordinated Debt Securities Indenture.

25(d)    Statement of Eligibility of The Bank of New York, as Trustee of the
         Preferred Securities Guarantee of the Company for the benefit of the
         holders of the Preferred Securities of PSCO Capital Trust I.

25(e)    Statement of Eligibility of The Bank of New York, as Trustee under the
         Amended and Restated Declaration of Trust of PSCO Capital Trust I.

- --------------
*  Previously filed as indicated and incorporated herein by reference.

                                     II-8

<PAGE>

                                                                 Exhibit 4(a)(3)


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



                                       
                             SUPPLEMENTAL INDENTURE

                           DATED AS OF [           ]

                             _____________________


                       PUBLIC SERVICE COMPANY OF COLORADO

                                       TO

                            FIRST TRUST OF NEW YORK,
                             NATIONAL ASSOCIATION,

                                                                      AS TRUSTEE
                             _____________________


                   Creating an Issue of First Mortgage Bonds,
                            Collateral Series [___]

                             _____________________


         (Supplemental to Indenture dated as of December 1, 1939, as amended)



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

<PAGE>

          SUPPLEMENTAL INDENTURE, dated as of [________________], between PUBLIC
SERVICE COMPANY OF COLORADO, a corporation organized and existing under the laws
of the State of Colorado (the "Company"), party of the first part, and FIRST
TRUST OF NEW YORK, NATIONAL ASSOCIATION, a national banking association, as
successor trustee (the "Trustee") to Morgan Guaranty Trust Company of New York
(formerly Guaranty Trust Company of New York), party of the second part.

          WHEREAS, the Company heretofore executed and delivered to the Trustee
its Indenture, dated as of December 1, 1939 (the "Principal Indenture"), to
secure its First Mortgage Bonds from time to time issued thereunder; and

          WHEREAS,  the Company has heretofore executed and delivered to the
Trustee the Supplemental Indentures referred to in Schedule A hereto for certain
purposes, including the creation of series of bonds, the subjection to the lien
of the Principal Indenture of property acquired after the execution and delivery
thereof, the amendment of certain provisions of the Principal Indenture and the
appointment of the successor Trustee; and

          WHEREAS, the Principal Indenture as supplemented and amended by all
Supplemental Indentures heretofore executed by the Company and the Trustee is
hereinafter referred to as the "Indenture," and, unless the context requires
otherwise, references herein to Articles and Sections of the Indenture shall be
to Articles and Sections of the Principal Indenture as so amended; and

          WHEREAS, the Company proposes to create a new series of First Mortgage
Bonds to be designated as First Mortgage Bonds, Collateral Series [____] (the
"Collateral Series [____] Bonds"), to be issued and delivered [from time to
time] to the trustee under the 1993 Mortgage (as hereinafter defined) as the
basis for the authentication and delivery under the 1993 Mortgage of a series of
securities [constituting medium-term notes], all as hereinafter provided, and to
vary in certain respects the covenants and provisions contained in Article V of
the Indenture, to the extent that such covenants and provisions apply to the
Collateral Series [____] Bonds; and

          WHEREAS, the Company, pursuant to the provisions of the Indenture,
has, by appropriate corporate action, duly resolved and determined to execute
this Supplemental Indenture for the purpose of providing for the creation of the
Collateral Series [____] Bonds and of specifying the form, provisions and
particulars thereof, as in the Indenture provided or permitted and of giving to
the Collateral Series [____] Bonds the protection and security of the Indenture;
and

          [WHEREAS, the Company has acquired the additional property hereinafter
described, and the Company desires that such additional property so acquired be
specifically subjected to the lien of the Indenture; and]

          WHEREAS, the Company represents that all acts and proceedings required
by law and by the charter and by-laws of the Company, including all action
requisite on the part of its shareholders, directors and officers, necessary to
make the Collateral Series [____] Bonds, when 

<PAGE>

executed by the Company, authenticated and delivered by the Trustee and duly 
issued, the valid, binding and legal obligations of the Company, and to 
constitute the Principal Indenture and all indentures supplemental thereto, 
including this Supplemental Indenture, valid, binding and legal instruments 
for the security of the bonds of all series, including the Collateral Series 
[____] Bonds, in accordance with the terms of such bonds and such instruments, 
have been done, performed and fulfilled, and the execution and delivery hereof 
have been in all respects duly authorized;

    NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:

          That Public Service Company of Colorado, the Company named in the
Indenture, in consideration of the premises and of One Dollar to it duly paid by
the Trustee at or before the ensealing and delivery of these presents, the
receipt whereof is hereby acknowledged, and in pursuance of the direction and
authority of the Board of Directors of the Company given at a meeting thereof
duly called and held, and in order to create the Collateral Series [____] Bonds
and to specify the form, terms and provisions thereof, [and to make definite and
certain the lien of the Indenture upon the premises hereinafter described and to
subject said premises directly to the lien of the Indenture,] and to secure the
payment of the principal of and premium, if any, and interest, if any, on all
bonds from time to time outstanding under the Indenture, including the
Collateral Series [____] Bonds, according to the terms of said bonds, and to
secure the performance and observance of all of the covenants and conditions
contained in the Indenture, has executed and delivered this Supplemental
Indenture [and has granted, bargained, sold, warranted, aliened, remised,
released, conveyed, assigned, transferred, mortgaged, pledged, set over and
confirmed, and by these presents does grant, bargain, sell, warrant, alien,
remise, release, convey, assign, transfer, mortgage, pledge, set over and
confirm unto First Trust of New York, National Association, as Trustee, and its
successor or successors in the trust and its and their assigns forever, the
property described in Schedule B hereto (which is described in such manner as to
fall within and under the headings or parts or classifications set forth in the
Granting Clauses of the Principal Indenture)];

          TO HAVE AND TO HOLD the same and all and singular the properties,
rights, privileges and franchises described in the Principal Indenture and in
the several Supplemental Indentures hereinabove referred to [and in this
Supplemental Indenture] and owned by the Company on the date of the execution
and delivery hereof (other than property of a character expressly excepted from
the lien of the Indenture as therein set forth) unto the Trustee and its
successor or successors and assigns forever;

          SUBJECT, HOWEVER, to permitted encumbrances as defined in the
Indenture;

          IN TRUST, NEVERTHELESS, upon the terms and trusts set forth in the
Indenture, for the equal and proportionate benefit and security of all present
and future holders of the bonds and coupons issued and to be issued under the
Indenture, including the Collateral Series [____] Bonds, without preference,
priority or distinction as to lien (except as any sinking, amortization,
improvement or other fund established in accordance with the provisions of the
Indenture or any indenture supplemental thereto may afford additional security
for the bonds of any particular series) of any of said bonds over any others
thereof by reason of series, priority in 


                                      -2-
<PAGE>

the time of the issue or negotiation thereof, or otherwise howsoever, except 
as provided in Section 2 of Article IV of the Indenture.

                                     ARTICLE ONE

            CREATION AND DESCRIPTION OF THE COLLATERAL SERIES [____] BONDS

          SECTION 1.  A new series of bonds to be issued [from time to time]* 
under and secured by the Indenture is hereby created, the bonds of such new 
series to be designated First Mortgage Bonds, Collateral Series [        ].  
The Collateral Series [         ] Bonds shall be limited to an aggregate 
principal amount of [                             ]dollars ($[               ]
), excluding any Collateral Series [____] Bonds which may be authenticated and 
exchanged for or in lieu of or in substitution for or on transfer of other 
Collateral Series [                 ] Bonds pursuant to any provisions of the 
Indenture.  [The Collateral Series [               ] Bonds shall mature on 
[                        ].] The Collateral Series [                ] Bonds 
shall not bear interest [and each Collateral Series [            ] Bond shall 
(a) be issued in such principal amount, (b) mature on such date not less than 
nine months nor more than thirty years from its Original Issue Date (as 
hereinafter defined), and (c) have such other terms and conditions as shall 
not be inconsistent with the provisions of the Indenture, all as shall be 
specified by the Company in a certificate, executed by the President, any Vice 
President, the Treasurer or any Assistant Treasurer of the Company, delivered 
to the Trustee relating to such Collateral Series [               ] Bond and 
referring to this Supplemental Indenture (each such certificate being deemed 
to constitute a part of this Supplemental Indenture and being hereinafter 
sometimes called an "Issuance Certificate"), such specification by such an 
officer of the Company in an Issuance Certificate having been heretofore 
authorized in a resolution of the Board of Directors of the Company].*

          The principal of each Collateral Series [              ] Bond shall be
payable, upon presentation thereof, at the office or agency of the Company in
the city in which the principal corporate trust office of the 1993 Mortgage
Trustee (as hereinafter defined) is located, in any coin or currency of the
United States of America which at the time of payment shall be legal tender for
the payment of public and private debts.

          The Collateral Series [                  ] Bonds shall be issued and
delivered [from time to time]* by the Company to First Trust of New York,
National Association, as successor trustee under the Indenture, dated as of
October 1, 1993, as supplemented (the "1993 Mortgage"), of the Company to such
trustee (the "1993 Mortgage Trustee"), as the basis for the authentication and
delivery under the 1993 Mortgage of a series of securities.  As provided in the
1993 Mortgage, the Collateral Series [           ] Bonds will be registered in
the name of the 1993 Mortgage Trustee or its nominee and will be owned and held
by the 1993 Mortgage Trustee, subject to the provisions of the 1993 Mortgage,
for the benefit of the holders of all securities from time to time outstanding
under the 1993 Mortgage, and the Company shall have no interest therein.

- -----------------------
    * For medium-term notes.


                                      -3-
<PAGE>

          Any payment by the Company under the 1993 Mortgage of the principal of
any securities which shall have been authenticated and delivered under the 1993
Mortgage on the basis of the issuance and delivery to the 1993 Mortgage Trustee
of Collateral Series [           ] Bonds (other than by the application of the
proceeds of a payment in respect of such Collateral Series [____] Bonds) shall,
to the extent thereof, be deemed to satisfy and discharge the obligation of the
Company, if any, to make a payment of principal of such Collateral Series
[           ] Bonds which is then due.

          The Trustee may conclusively presume that the obligation of the
Company to pay the principal of any Collateral Series [           ] Bonds as the
same shall become due and payable shall have been fully satisfied and discharged
unless and until it shall have received a written notice from the 1993 Mortgage
Trustee, signed by an authorized officer thereof, stating that the principal of
specified Collateral Series [           ] Bonds has become due and payable and
has not been fully paid, and specifying the amount of funds required to make
such payment.

          Each Collateral Series [____] Bond shall be dated as of the date of
its authentication.

          The Collateral Series [           ]  Bonds shall be issued as fully
registered bonds only, in denominations of $1,000 and integral multiples
thereof.

          The Collateral Series [           ] Bonds shall be registerable and
exchangeable at the office or agency of the Company in the city in which the
principal corporate trust office of the 1993 Mortgage Trustee is located, in the
manner and upon the terms set forth in Section 5 of Article II of the Indenture;
provided, however, that the Collateral Series [           ] Bonds shall not be
transferable except to a successor trustee under the 1993 Mortgage.  No service
charge shall be made for any exchange or transfer of any Collateral Series
[           ] Bond.

          [If and to the extent necessary to eliminate any apparent
inconsistency between any provision of this Supplemental Indenture and any
provision of the Indenture all Collateral Series [           ] Bonds having the
same Original Issue Date, Stated Maturity, interest rate, and other terms and
conditions shall be deemed to be a separate series of bonds, and such Original
Issue Date, Stated Maturity, interest rate, if any, and other terms and
conditions shall be deemed to be a part of the designation of such series.

          As used herein, the term "Original Issue Date" shall mean, with
respect to any Collateral Series [           ] Bond, the date of authentication
and delivery hereunder of such Collateral Series [           ] Bond, or, in the
case of any particular Collateral Series [           ] Bond which has been
authenticated and delivered upon the registration of transfer or exchange of, or
in substitution for, another Collateral Series [           ] Bond, the date of
the original authentication and delivery hereunder of the first Collateral
Series [           ] Bond authenticated and delivered hereunder representing all
or a portion of the same obligation as that evidenced by such particular
Collateral Series [           ] Bond; the term "Stated Maturity" shall mean,
with respect to any Collateral Series [           ] Bond, the date on which the
principal of such Collateral Series [           ] Bond is stated to be due and
payable (without regard to any provision for acceleration, redemption or similar
provisions); and the term "Maturity" shall mean, with respect to any 


                                      -4-
<PAGE>

Collateral Series [           ] Bond, the date on which the principal of such 
Collateral Series [           ] Bond becomes due and payable, whether at 
Stated Maturity, by declaration of acceleration, upon call for redemption or 
otherwise.]*

          SECTION 2.  The text of the Collateral Series [           ] Bonds
shall be substantially in the form attached hereto as Exhibit A.

          SECTION 3.  The Collateral Series [           ] Bonds may be executed
by the Company and delivered to the Trustee and, upon compliance with all
applicable provisions and requirements of the Indenture in respect thereof,
shall be authenticated by the Trustee and delivered (without awaiting the filing
or recording of this Supplemental Indenture)[, from time to time,]* in
accordance with the written order or orders of the Company.


                                  ARTICLE TWO

            REDEMPTION OF THE COLLATERAL SERIES [           ] BONDS

          SECTION 1.  Each Collateral Series [           ] Bond shall be
redeemable at the option of the Company in whole at any time, or in part from
time to time, prior to maturity, at a redemption price equal to 100% of the
principal amount thereof to be redeemed.

          SECTION 2.  The provisions of Sections 3, 4, 5, 6 and 7 of Article V
of the Indenture shall be applicable to the Collateral Series [           ]
Bonds, except that (a) no publication of notice of redemption of the Collateral
Series [           ] Bonds shall be required and (b) if less than all the
Collateral Series [           ] Bonds are to be redeemed, the Collateral Series
[           ] Bonds to be redeemed shall be selected from the maturities, and in
the principal amounts, designated to the Trustee by the Company, and except as
such provisions may otherwise be inconsistent with the provisions of this
Article Two.

          SECTION 3.  The holder of each and every Collateral Series
[           ] Bond issued hereunder hereby agrees to accept payment thereof
prior to maturity on the terms and conditions provided for in this Article Two.


                                 ARTICLE THREE

                        ACKNOWLEDGMENT OF RIGHT TO VOTE
                           OR CONSENT WITH RESPECT TO
                        CERTAIN AMENDMENTS TO INDENTURE

          The Company hereby acknowledges the right of the holders of the
Collateral Series [           ] Bonds to vote or consent with respect to any or
all of the modifications to the 

- ----------------------
    *   For medium-term notes.


                                      -5-
<PAGE>

Indenture referred to in Article Three of the Supplemental Indenture, dated as 
of March 1, 1980, irrespective of the fact that the Bonds of the Second 1987 
Series are no longer outstanding; PROVIDED, HOWEVER, that such acknowledgment 
shall not impair (a) the right of the Company to make such modifications 
without the consent or other action of the holders of the Bonds of the 2020 
Series or the bonds of any other series subsequently created under the 
Indenture with respect to which the Company has expressly reserved such right 
or (b) the right of the Company to reserve the right to make such 
modifications without the consent or other action of the holders of bonds of 
one or more, or any or all, series created subsequent to the creation of the 
Collateral Series [           ] Bonds.

                                  ARTICLE FOUR

                                  THE TRUSTEE

          The Trustee accepts the trusts created by this Supplemental Indenture
upon the terms and conditions set forth in the Indenture and this Supplemental
Indenture.  The recitals in this Supplemental Indenture are made by the Company
only and not by the Trustee.  Each and every term and condition contained in
Article XII of the Indenture shall apply to this Supplemental Indenture with the
same force and effect as if the same were herein set forth in full, with such
omissions, variations and modifications thereof as may be appropriate to make
the same conform to this Supplemental Indenture.


                                  ARTICLE FIVE

                            MISCELLANEOUS PROVISIONS

          SECTION 1.  Subject to the variations contained in Article Two of this
Supplemental Indenture, the Indenture is in all respects ratified and confirmed
and the Principal Indenture, this Supplemental Indenture and all other
indentures supplemental to the Principal Indenture shall be read, taken and
construed as one and the same instrument.  Neither the execution of this
Supplemental Indenture nor anything herein contained shall be construed to
impair the lien of the Indenture on any of the properties subject thereto, and
such lien shall remain in full force and effect as security for all bonds now
outstanding or hereafter issued under the Indenture.

          All covenants and provisions of the Indenture shall continue in full
force and effect and this Supplemental Indenture shall form part of the
Indenture.

          SECTION 2.  If the date for making any payment or the last date for
performance of any act or the exercising of any right, as provided in this
Supplemental Indenture, shall not be a Business Day (as defined in the 1993
Mortgage), such payment may be made or act performed or right exercised on the
next succeeding Business Day with the same force and effect as if done on the
nominal date provided in this Supplemental Indenture.


                                      -6-
<PAGE>

          SECTION 3.  The terms defined in the Indenture shall, for all purposes
of this Supplemental Indenture, have the meaning specified in the Indenture
except as set forth in Section 4 of this Article or otherwise set forth in this
Supplemental Indenture or unless the context clearly indicates some other
meaning to be intended.

          SECTION 4.  Any term defined in Section 303 of the Trust Indenture Act
of 1939, as amended, and not otherwise defined in the Indenture shall, with
respect to this Supplemental Indenture and the Collateral Series [           ]
Bonds, have the meaning assigned to such term in Section 303 as in force on the
date of the execution of this Supplemental Indenture.

          SECTION 5.  This Supplemental Indenture may be executed in any number
of counterparts, and all of said counterparts executed and delivered, each as an
original, shall constitute but one and the same instrument.


                                      -7-
<PAGE>

          IN WITNESS WHEREOF, Public Service Company of Colorado, party hereto
of the first part, has caused its corporate name to be hereunto affixed, and
this instrument to be signed by its President or any Vice President, and its
corporate seal to be hereunto affixed and attested by its Secretary or an
Assistant Secretary for and in its behalf; and First Trust of New York, National
Association, the party hereto of the second part, in evidence of its acceptance
of the trust hereby created, has caused its corporate name to be hereunto
affixed, and this instrument to be signed and its corporate seal to be affixed
by one of its Vice Presidents and attested by one of its Assistant Secretaries,
for and in its behalf, all as of the day and year first above written.

                                   PUBLIC SERVICE COMPANY OF
                                      COLORADO


                                   By:______________________________________
                                      [Name]
                                      {Vice} President

ATTEST:_______________________
       [Name]
       {Assistant} Secretary

                                   FIRST TRUST OF NEW YORK,
                                      NATIONAL ASSOCIATION,
                                             AS TRUSTEE


                                   By:______________________________________
                                      [Name]
                                      {Vice} President

ATTEST:_______________________
       [Name]
       {Assistant} Secretary


                                      -8-
<PAGE>

STATE OF COLORADO             )
                              )    ss.:
CITY AND COUNTY OF DENVER     )


          On this ____ day of ______________, before me, _____________________,
a duly authorized Notary Public in and for said City and County in the State
aforesaid, personally appeared ___________________ and ________________, to me
known to be a ______________ and a ______________, respectively, of PUBLIC
SERVICE COMPANY OF COLORADO, a corporation organized and existing under the laws
of the State of Colorado, one of the corporations that executed the within and
foregoing instrument; and the said _______________ and _______________,
severally, acknowledged the said instrument to be the free and voluntary act and
deed of said corporation, for the uses and purposes therein mentioned, and on
oath stated that they were authorized to execute said instrument and that the
seal affixed thereto is the corporate seal of said corporation.

          IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year first above written.


                                        _____________________________________
                                        Notary Public


                                      -9-
<PAGE>

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


          On this _______ day of ___, before me, _____________, a duly
authorized Notary Public in and for said City and County in the State aforesaid,
personally appeared _______________ and ______________, to me known to be a Vice
President and an Assistant Secretary, respectively, of FIRST TRUST OF NEW YORK,
National Association, a national banking association, one of the corporations
that executed the within and foregoing instrument; and the said
___________________ and ___________________, severally, acknowledged the said
instrument to be the free and voluntary act and deed of said corporation, for
the uses and purposes therein mentioned, and on oath stated that they were
authorized to execute said instrument and that the seal affixed thereto is the
corporate seal of said corporation.

          IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year first above written.


                                        _____________________________________
                                        Notary Public


                                      -10-
<PAGE>

                                                                  EXHIBIT A


                     FORM OF COLLATERAL SERIES [           ] BOND

          This bond is not transferable except to a successor trustee under 
the Indenture, dated as of October 1, 1993, as supplemented, between Public 
Service Company of Colorado and First Trust of New York, National 
Association, as successor trustee thereunder.

                          PUBLIC SERVICE COMPANY OF COLORADO

                                 FIRST MORTGAGE BOND,

                             COLLATERAL SERIES [       ]

                                  [DUE {         }]

REGISTERED                                              REGISTERED

No....................                                  $.....................


                             [Original Issue Date:
                                Stated Maturity:]*

          FOR VALUE RECEIVED, PUBLIC SERVICE COMPANY OF COLORADO, a 
corporation organized and existing under the laws of the State of Colorado 
(hereinafter sometimes called the "Company"), promises to pay to First Trust 
of New York, National Association, as successor trustee (the "1993 Mortgage 
Trustee") under the Indenture, dated as of October 1, 1993 (the "1993 
Mortgage"), of the Company, or registered assigns,

Dollars on [          ] [the Stated Maturity specified above]* (unless this 
bond shall then be deemed to have been paid in accordance with the provisions 
of the Indenture referred to below) at the office or agency of the Company in 
the city in which the principal corporate trust office of the 1993 Mortgage 
Trustee is located.  This bond shall not bear interest.  The principal of 
this bond shall be payable in any coin or currency of the United States of 
America which at the time of payment shall be legal tender for the payment of 
public and private debts.

          Any payment by the Company under the 1993 Mortgage of the principal 
of securities which shall have been authenticated and delivered under the 
1993 Mortgage on the basis of the issuance and delivery to the 1993 Mortgage 
Trustee of this bond (the "1993 Mortgage Securities") (other than by the 
application of the proceeds of a payment in respect of 
- -------------------------------
    *   For medium-term notes only.

                                      A-1

<PAGE>

this bond) shall, to the extent thereof, be deemed to satisfy and discharge 
the obligation of the Company, if any, to make a payment of principal of this 
bond which is then due.

          This bond is one of an issue of bonds of the Company, issued and to 
be issued in one or more series under and equally and ratably secured (except 
as any sinking, amortization, improvement or other fund, established in 
accordance with the provisions of the indenture hereinafter mentioned, may 
afford additional security for the bonds of any particular series) by a 
certain indenture, dated as of December 1, 1939, made by the Company to First 
Trust of New York, National Association as successor trustee (hereinafter 
called the "Trustee") to Morgan Guaranty Trust Company of New York (formerly 
Guaranty Trust Company of New York), as amended and supplemented by several 
indentures supplemental thereto, including the Supplemental Indenture dated 
as of [                      ] (said Indenture as amended and supplemented by 
said indentures supplemental thereto being hereinafter called the 
"Indenture"), to which Indenture reference is hereby made for a description 
of the property mortgaged, the nature and extent of the security, the rights 
and limitations of rights of the Company, the Trustee, and the holders of 
said bonds, under the Indenture, and the terms and conditions upon which said 
bonds are secured, to all of the provisions of which Indenture and of all 
indentures supplemental thereto in respect of such security, including the 
provisions of the Indenture permitting the issue of bonds of any series for 
property which, under the restrictions and limitations therein specified, may 
be subject to liens prior to the lien of the Indenture, the holder, by 
accepting this bond, assents.  To the extent permitted by and as provided in 
the Indenture, the rights and obligations of the Company and of the holders 
of said bonds (including those pertaining to any sinking or other fund) may 
be changed and modified, with the consent of the Company, by the holders of 
at least 75% in aggregate principal amount of the bonds then outstanding 
(excluding bonds disqualified from voting by reason of the Company's interest 
therein as provided in the Indenture); PROVIDED, HOWEVER, that without the 
consent of the holder hereof no such modification or alteration shall be made 
which will extend the time of payment of the principal of this bond or reduce 
the principal amount hereof or effect any other modification of the terms of 
payment of such principal or will reduce the percentage of bonds required for 
the aforesaid actions under the Indenture.  The Company has reserved the 
right to amend the Indenture without any consent or other action by holders 
of any series of bonds created after October 31, 1975 (including this series) 
so as to change 75% in the foregoing sentence to 60% and to change certain 
procedures relating to bondholders' meetings.  This bond is one of a series 
of bonds designated as the First Mortgage Bonds, Collateral Series 
[          ], of the Company.

          This bond shall be redeemable at the option of the Company in whole
at any time, or in part from time to time, prior to [maturity] 
[the Stated Maturity specified above], at a  redemption price equal to 100% 
of the principal amount thereof to be redeemed.

          The principal of this bond may be declared or may become due before 
the [maturity] [the Stated Maturity specified above]*, on the conditions, in 
the manner and at the times set forth in the Indenture, upon the happening of 
an event of default as therein provided.
- -------------------------------
    *   For medium-term notes only.

                                      A-2

<PAGE>

          This bond is not transferable except to a successor trustee under 
the 1993 Mortgage, any such transfer to be made at the office or agency of 
the Company in the city in which the principal corporate trust office of the 
1993 Mortgage Trustee is located, upon surrender and cancellation of this 
bond, and thereupon a new bond of this series of a like principal amount 
[and having the same Original Issue Date, Stated Maturity and other terms
and conditions,]* will be issued to the transferee in exchange therefor, as
provided in the Indenture. The Company, the Trustee, any paying agent and any 
registrar may deem and treat the person in whose name this bond is registered 
as the absolute owner hereof for the purpose of receiving payment and for all 
other purposes.  This bond, alone or with other bonds of this series, may in 
like manner be exchanged at such office or agency for one or more new bonds 
of this series of the same aggregate principal amount, [and having the same
Original Issue Date, Stated Maturity, and other terms and conditions,]* all 
as provided in the Indenture. No service charge shall be made to any holder 
of any bond of this series for any exchange or transfer of bonds.

          No recourse under or upon any covenant or obligation of the 
Indenture, or of any bonds thereby secured, or for any claim based thereon, 
or otherwise in any manner in respect thereof, shall be had against any 
incorporator, subscriber to the capital stock, shareholder, officer or 
director, as such, of the Company, whether former, present or future, either 
directly, or indirectly through the Company or the Trustee, by the 
enforcement of any subscription to capital stock, assessment or otherwise, or 
by any legal or equitable proceeding by virtue of any statute or otherwise 
(including, without limiting the generality of the foregoing, any proceeding 
to enforce any claimed liability of shareholders of the Company based upon 
any theory of disregarding the corporate entity of the Company or upon any 
theory that the Company was acting as the agent or instrumentality of the 
shareholders), any and all such liability of incorporators, shareholders, 
subscribers, officers and directors, as such, being released by the holder 
hereof, by the acceptance of this bond, and being likewise waived and 
released by the terms of the Indenture under which this bond is issued.

          This bond shall not be valid or become obligatory for any purpose 
until the certificate of authentication endorsed hereon shall have been 
signed by First Trust of New York, National Association, or its successor, as 
Trustee under the Indenture.

          IN WITNESS WHEREOF, Public Service Company of Colorado has caused 
this bond to be signed in its name by the facsimile signature of an Executive 
Vice President and its corporate seal to be imprinted hereon and attested by 
the facsimile signature of its Secretary.

Dated:                             PUBLIC SERVICE COMPANY OF
                                     COLORADO


                                   By:                      
                                      --------------------------
                                       Executive Vice President
 
ATTEST:                  
       -----------------------
               Secretary

                                      A-3

<PAGE>

                            CERTIFICATE OF AUTHENTICATION

          This is one of the securities of the series designated therein
referred to in the within mentioned Supplemental Indenture.

Dated:                                  FIRST TRUST OF NEW YORK, NATIONAL
                                        ASSOCIATION,
                                         AS TRUSTEE


                                   By:                      
                                      ----------------------------
                                          Authorized Officer





                                      A-4

<PAGE>

                                                                   SCHEDULE A


                               SUPPLEMENTAL INDENTURES

<TABLE>
<CAPTION>

       Date of                                       Principal      Principal
    Supplemental                                       Amount         Amount
      Indenture             Series of Bonds            Issued      Outstanding
 -----------------          ----------------         ----------    -----------
<S>                         <C>                      <C>           <C>

 March 14, 1941                  None                    --             --
 May 14, 1941                    None                    --             --
 April 28, 1942                  None                    --             --
 April 14, 1943                  None                    --             --
 April 27, 1944                  None                    --             --
 April 18, 1945                  None                    --             --
 April 23, 1946                  None                    --             --
 April 9, 1947                   None                    --             --
 June 1, 1947*          2-7/8%  Series due 1977     $40,000,000        None
 April 1, 1948                   None                    --             --
 May 20, 1948                    None                    --             --
 October 1, 1948        3-1/8% Series due 1978       10,000,000        None
 April 20, 1949                  None                    --             --
 April 24, 1950                  None                    --             --
 April 18, 1951                  None                    --             --
 October 1, 1951        3-1/4% Series due 1981       15,000,000        None
 April 21, 1952                  None                    --             --
 December 1, 1952                None                    --             --
 April 15, 1953                  None                    --             --
 April 19, 1954                  None                    --             --
 October 1, 1954*       3-1/8% Series due 1984       20,000,000        None
 April 18, 1955                  None                    --             --
 
</TABLE>

                                      I-1

<PAGE>

<TABLE>
<CAPTION>

       Date of                                       Principal      Principal
    Supplemental                                       Amount         Amount
      Indenture             Series of Bonds            Issued      Outstanding
 -----------------          ----------------         ----------    -----------
<S>                         <C>                      <C>           <C>

 April 24, 1956                  None                    --             --
 May 1, 1957*           4-3/8% Series due 1987       30,000,000        None
 April 10, 1958                  None                    --             --
 May 1, 1959            4-5/8% Series due 1989       20,000,000        None
 April 18, 1960                  None                    --             --
 April 19, 1961                  None                    --             --
 October 1, 1961        4-1/2% Series due 1991       30,000,000        None
 March 1, 1962          4-5/8% Series due 1992       8,800,000         None
 June 1, 1964           4-1/2% Series due 1994       35,000,000        None
 May 1, 1966            5-3/8% Series due 1996       35,000,000        None
 July 1, 1967*          5-7/8% Series due 1997       35,000,000        None
 July 1, 1968*          6-3/4% Series due 1998       25,000,000     25,000,000
 April 25, 1969                  None                    --             --
 April 21, 1970                  None                    --             --
 September 1, 1970      8-3/4% Series due 2000       35,000,000        None
 February 1, 1971       7-1/4% Series due 2001       40,000,000        None
 August 1, 1972         7-1/2% Series due 2002       50,000,000        None
 June 1, 1973           7-5/8% Series due 2003       50,000,000        None
 March 1, 1974        Pollution Control Series A     24,000,000     22,000,000
 December 1, 1974     Pollution Control Series B     50,000,000        None
 October 1, 1975        9-3/8% Series due 2005       50,000,000        None
 April 28, 1976                  None                    --             --
 April 28, 1977                  None                    --             --
 November 1, 1977*      8-1/4% Series due 2007       50,000,000        None
 April 28, 1978                  None                    --             --
 October 1, 1978        9-1/4% Series due 2008       50,000,000        None

</TABLE>

                                      I-2

<PAGE>

<TABLE>
<CAPTION>
       Date of                                       Principal      Principal
    Supplemental                                       Amount         Amount
      Indenture             Series of Bonds            Issued      Outstanding
 -----------------          ----------------         ----------    -----------
<S>                         <C>                      <C>           <C>

 October 1, 1979*     Pollution Control Series C     50,000,000        None
 March 1, 1980*           15% Series due 1987        50,000,000        None
 April 28, 1981                  None                    --             --
 November 1, 1981*    Pollution Control Series D     27,380,000        None
 December 1, 1981*      16-1/4% Series due 2011      50,000,000        None
 April 29, 1982                  None                    --             --
 May 1, 1983*         Pollution Control Series E     42,000,000        None
 April 30, 1984                  None                    --             --
 March 1, 1985*           13% Series due 2015        50,000,000        None
 November 1, 1986*    Pollution Control Series F     27,250,000     27,250,000
 May 1, 1987*            8.95% Series due 1992       75,000,000        None
 July 1, 1990*          9-7/8% Series due 2020       75,000,000     75,000,000
 December 1, 1990*    Secured Medium-Term Notes,   191,500,000**    73,500,000
                               Series A
 March 1, 1992*       8-1/8% Series due 2004 and    100,000,000    100,000,000
                        8-3/4% Series due 2022      150,000,000    150,000,000
 April 1, 1993*       Pollution Control Series G     79,500,000     79,500,000
 June 1, 1993*        Pollution Control Series H     50,000,000     50,000,000
 November 1, 1993*        Collateral Series A       134,500,000    134,500,000
 January 1, 1994*    Collateral Series B due 2001   102,667,000    102,667,000
                     Collateral Series B due 2024   110,000,000    110,000,000
 September 2, 1994     (appointment of successor        None           None
                               trustee)
 May 1, 1996*        Collateral Series C due 2006   125,000,000    125,000,000
 November 1, 1996*      Collateral Series D due     250,000,000    250,000,000
                       from 9 months to 30 years
                          from date of issue

</TABLE>

                                      I-3

<PAGE>

<TABLE>
<CAPTION>

       Date of                                       Principal      Principal
    Supplemental                                       Amount         Amount
      Indenture             Series of Bonds            Issued      Outstanding
 -----------------          ----------------         ----------    -----------
<S>                         <C>                      <C>           <C>

 February 1, 1997*      Collateral Series E due     150,000,000    100,000,000
                       from 9 months to 30 years
                          from date of issue
</TABLE>

- -------------------------------
*     Contains amendatory provisions
**   $200,000,000 authorized








                                      I-4

<PAGE>

                                                             SCHEDULE B

                                 PROPERTY DESCRIPTION









                                      II-1

<PAGE>


                                                                Exhibit 4(b)(3)

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

                                          
                               PUBLIC SERVICE COMPANY
                                    OF COLORADO
                                          
                                         TO
                                          
                              FIRST TRUST OF NEW YORK,
                                NATIONAL ASSOCIATION,
                                          
                                          
                                                                     as Trustee

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

                          SUPPLEMENTAL INDENTURE NO. [   ]


                     Dated as of [                            ]


                           Supplemental to the Indenture
                            dated as of October 1, 1993

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

                 Establishing the Securities of Series No._[___]
                          designated [First Collateral
                          Trust Bonds, Series No. {__}]*
                   [Secured Medium-Term Notes, Series_{___}]**

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

*    For bonds.
**  For medium-term notes.

<PAGE>

          SUPPLEMENTAL INDENTURE NO. [___], dated as of [__________________],
between PUBLIC SERVICE COMPANY OF COLORADO, a corporation duly organized and
existing under the laws of the State of Colorado (hereinafter sometimes called
the "Company"), and FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION, a national
banking association (hereinafter sometimes called the "Trustee"), as successor
trustee to Morgan Guaranty Trust Company of New York under the Indenture, dated
as of October 1, 1993 (hereinafter called the "Original Indenture"), as
previously supplemented and as further supplemented by this Supplemental
Indenture No. [___]. The Original Indenture and any and all indentures and other
instruments supplemental thereto are hereinafter sometimes collectively called
the "Indenture".

                               Recitals of the Company

          The Original Indenture was authorized, executed and delivered by the
Company to provide for the issuance from time to time of its Securities (such
term and all other capitalized terms used herein without definition having the
meanings assigned to them in the Original Indenture), to be issued in one or
more series as contemplated therein, and to provide security for the payment of
the principal of and premium, if any, and interest, if any, on the Securities.

          The Company has heretofore executed and delivered to the Trustee the
Supplemental Indentures referred to in Schedule A hereto for the purpose of
establishing various series of bonds and of appointing the successor trustee.

          The Company desires to establish a series of Securities to be
designated ["First Collateral Trust Bonds, Series No. {___}"] ["Secured Medium
Term Notes, Series {___}", being a series of First Collateral Trust Bonds], such
series of Securities to be hereinafter sometimes called "Series No. [___]".

          The Company has duly authorized the execution and delivery of this
Supplemental Indenture No. [___] to establish the Securities of Series No. [___]
and has duly authorized the issuance of such Securities; and all acts necessary
to make this Supplemental Indenture No. [___] a valid agreement of the Company,
and to make the Securities of Series No. [___] valid obligations of the Company,
have been performed.


                                   Granting Clauses

          NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE NO. [___] WITNESSETH,
that, in consideration of the premises and of the purchase of the Securities by
the Holders thereof, and in order to secure the payment of the principal of and
premium, if any, and interest, if any, on all Securities from time to time
Outstanding and the performance of the 

<PAGE>

covenants contained therein and in the Indenture and to declare the terms and 
conditions on which such Securities are secured, the Company hereby grants, 
bargains, sells, releases, conveys, assigns, transfers, mortgages, pledges, 
sets over and confirms to the Trustee, and grants to the Trustee a security 
interest in, the following:

                                Granting Clause First

          All right, title and interest of the Company, as of the date of the
execution and delivery of this Supplemental Indenture No. [___], in and to
property (other than Excepted Property), real, personal and mixed and wherever
situated, in any case used or to be used in or in connection with the Electric
Utility Business (whether or not such use is the sole use of such property),
including without limitation [(a) all lands and interests in land described or
referred to in Schedule B hereto]; (b) all other lands, easements, servitudes,
licenses, permits, rights of way and other rights and interests in or relating
to real property used or to be used in or in connection with the Electric
Utility Business or relating to the occupancy or use of such real property,
subject however, to the exceptions and exclusions set forth in clause (a) of
Granting Clause First of the Original Indenture; (c) all plants, generators,
turbines, engines, boilers, fuel handling and transportation facilities, air and
water pollution control and sewage and solid waste disposal facilities and other
machinery and facilities for the generation of electric energy; (d) all
switchyards, lines, towers, substations, transformers and other machinery and
facilities for the transmission of electric energy; (e) all lines, poles,
conduits, conductors, meters, regulators and other machinery and facilities for
the distribution of electric energy; (f) all buildings, offices, warehouses and
other structures used or to be used in or in connection with the Electric
Utility Business; (g) all pipes, cables, insulators, ducts, tools, computers and
other data processing and/or storage equipment and other equipment, apparatus
and facilities used or to be used in or in connection with the Electric Utility
Business; (h) any or all of the foregoing properties in the process of
construction; and (i) all other property, of whatever kind and nature, ancillary
to or otherwise used or to be used in conjunction with any or all of the
foregoing or otherwise, directly or indirectly, in furtherance of the Electric
Utility Business;


                                Granting Clause Second

          Subject to the applicable exceptions permitted by Section 810(c),
Section 1303 and Section 1305 of the Original Indenture, all property (other
than Excepted Property) of the kind and nature described in Granting Clause
First which may be hereafter acquired by the Company, it being the intention of
the Company that all such property acquired by the Company after the date of the
execution and delivery of this Supplemental Indenture No. [___] shall be as
fully embraced within and subjected to the Lien hereof as if such property were
owned by the Company as of the date of the execution and delivery of this
Supplemental Indenture No. [___];


                                     -2-

<PAGE>

                                Granting Clause Fourth

          All other property of whatever kind and nature subjected or required
to be subjected to the Lien of the Indenture by any of the provisions thereof;

                                  Excepted Property

          Expressly excepting and excluding, however, from the Lien and
operation of the Indenture all Excepted Property of the Company, whether now
owned or hereafter acquired;

          TO HAVE AND TO HOLD all such property, real, personal and mixed, unto
the Trustee, its successors in trust and their assigns forever;

          SUBJECT, HOWEVER, to (a) Liens existing at the date of the execution
and delivery of the Original Indenture (including, but not limited to, the Lien
of the PSCO 1939 Mortgage), (b) as to property acquired by the Company after the
date of the execution and delivery of the Original Indenture, Liens existing or
placed thereon at the time of the acquisition thereof (including, but not
limited to, the Lien of any Class A Mortgage and purchase money Liens), (c)
Retained Interests and (d) any other Permitted Liens, it being understood that,
with respect to any property which was at the date of execution and delivery of
the Original Indenture or thereafter became or hereafter becomes subject to the
Lien of any Class A Mortgage, the Lien of the Indenture shall at all times be
junior, subject and subordinate to the Lien of such Class A Mortgage;

          IN TRUST, NEVERTHELESS, for the equal and proportionate benefit and
security of the Holders from time to time of all Outstanding Securities without
any priority of any such Security over any other such Security;

          PROVIDED, HOWEVER, that the right, title and interest of the Trustee
in and to the Mortgaged Property shall cease, terminate and become void in
accordance with, and subject to the conditions set forth in, Article Nine of the
Original Indenture, and if, thereafter, the principal of and premium, if any,
and interest, if any, on the Securities shall have been paid to the Holders
thereof, or shall have been paid to the Company pursuant to Section 603 of the
Original Indenture, then and in that case the Indenture shall terminate, and the
Trustee shall execute and deliver to the Company such instruments as the Company
shall require to evidence such termination; otherwise the Indenture, and the
estate and rights thereby granted, shall be and remain in full force and effect;
and

          THE PARTIES HEREBY FURTHER COVENANT AND AGREE as follows:


                                     -3-

<PAGE>

                                     ARTICLE ONE

                            Securities of Series No. [   ]

          There are hereby established the Securities of Series No. [   ], which
shall have the terms and characteristics set forth below (the lettered
subdivisions set forth below corresponding to the lettered subdivisions of
Section 301 of the Original Indenture):

               (a)  the title of the Securities of such series shall be ["First
          Collateral Trust Bonds, Series No. {   }"] ["Secured Medium-Term
          Notes, Series {   }", being a series of First Collateral Trust Bonds];
          provided, however, that, at any time after the PSCO 1939 Mortgage
          shall have been satisfied and discharged, the Company shall have the
          right, without any consent or other action by the Holders of such
          Securities, to change such title in such manner as shall be deemed by
          the Company to be appropriate to reflect such satisfaction and
          discharge, such change to be evidenced in an Officer's Certificate;

               (b)  there shall be no limit upon the aggregate principal amount
          of the Securities of Series No. [   ] which may be authenticated and
          delivered under the Indenture.  The Securities of Series No. [   ]
          shall be initially authenticated and delivered from time to time in
          the aggregate principal amount of [up to] $[___________];

               (c)  interest on the Securities of Series No. [   ] shall be
          payable to the Persons in whose names such Securities are registered
          at the close of business on the Regular Record Date for such interest,
          except as otherwise expressly provided in the form of such Security
          attached as Exhibit A hereto;

               (d)  the principal of [the Securities] [each Security]*  
          of Series No. [   ] shall be payable on [   ] [such date as is 
          specified in the Officer's Certificate applicable to such Security]*;

               (e)  [the Securities of Series No. {___} shall bear interest at
          the rate of {_______} per centum ({____%}) per annum; interest shall
          accrue on the Securities of Series No. {___} from {___________}, or
          the most recent date to which interest has been paid or duly provided
          for; the Interest Payment Dates for such Securities shall be
          {___________} and {_________} in each year, commencing {_________},
          and the Regular Record Dates with respect to the Interest Payment
          Dates for such Securities shall be {__________} and 

- ------------------------
* For medium-term notes


                                     -4-

<PAGE>

          {___________} in each year, respectively (whether or not a Business
          Day)]*; [an Officer's Certificate with respect to each Security of 
          Series No. {___} shall specify the rate at which such Security of 
          Series No. [___] shall bear interest, the date from which interest 
          shall accrue, the Interest Payment Dates if other than ______{____} 
          and _______ {____} of each year and the Regular Record Dates with 
          respect to the Interest Payment Dates if other than ______ {___} and 
          _______ {___}]**;

               (f)  the Corporate Trust Office of First Trust of New York,
          National Association, in New York, New York shall be the place at
          which (i) the principal of [,premium, if any,] and interest, if any,
          on the Securities of Series No. [___] shall be payable, (ii)
          registration of transfer of such Securities may be effected, (iii)
          exchanges of such Securities may be effected and (iv) notices and
          demands to or upon the Company in respect of such Securities and the
          Indenture may be served; and First Trust of New York, National
          Association, shall be the Security Registrar for the Securities;
          provided, however, that the Company reserves the right to change, by
          one or more Officer's Certificates, any such place or the Security
          Registrar; and provided, further, that the Company reserves the right
          to designate, by one or more Officer's Certificates, its principal
          office in Denver, Colorado as any such place or itself as the Security
          Registrar;

               (g)  the Securities of Series No. {   } [shall not be redeemable
          prior to _____________________.  On and after that date, the 
          Securities of Series No. {   } ]  


- ------------------------------- 
*   For bonds.
**  For medium-term notes.


                                     -5-

<PAGE>

[shall be redeemable in whole or in part, at the option of the Company, during
the period, at the prices and upon the conditions and terms as set forth below:

<TABLE>
                    If Redeemed in the             If Redeemed in the
                  12 Month Period Ending         12 Month Period Ending
                    on the last day of             on the last day of

              _____________       Premium    _____________       Premium
              <S>                 <C>        <C>                 <C>
              20__                  __%      20__                  __%
              20__                  __%      20__                  __%

              20__                  __%      20__                  __%

              20__                  __%      20__                  __%

              20__                  __%      20__                  __%
              20__                  __%      20__                  __%
</TABLE>


          [each Security of Series No. {   } shall be redeemable only if and to
the extent specified in the Officer's Certificate applicable to such Security of
Series No. {   }];* 

               (h)  not applicable [to any Security of Series No. {   }, except
          to the extent specified in the Officer's Certificate applicable to a
          particular Security of Series No. {   };*

               (i)  [not applicable] [the Securities of Series No. {   } shall
          be issuable in denominations of $100,000 and any greater amount which
          is an integral multiple of $1,000];*

               (j)  not applicable;

               (k)  not applicable;

               (l)  not applicable;

               (m)  not applicable;


- ------------------------------
*  For medium-term notes.


                                     -6-

<PAGE>

               (n)  not applicable [to any Security of Series No. {   }, except
          to the extent specified in the Officer's Certificate applicable to a
          particular Security of Series No. {   }];*

               (o)  not applicable;

               (p)  not applicable;

               (q)  [each Security of Series No. {   } is to be initially
          registered in the name of Cede & Co., as nominee for The Depository
          Trust Company (the "Depositary").  The Securities of Series No. {   }
          shall not be transferable or exchangeable, nor shall any purported
          transfer be registered, except as follows:

               (i)  a Security of Series No. {   } may be transferred in whole,
          and appropriate registration of transfer effected, if such transfer is
          by such nominee to the Depositary, or by the Depositary to another
          nominee thereof, or by any nominee of the Depositary to any other
          nominee thereof, or by the Depositary or any nominee thereof to any
          successor securities depositary or any nominee thereof; and

               (ii) a Security of Series No. {   } may be exchanged for
          certificated notes registered in the respective names of the
          beneficial holders thereof, and thereafter shall be transferable
          without restriction, if:

                    (A)  The Depositary, or any successor securities depositary,
               shall have notified the Company and the Trustee that it is
               unwilling or unable to continue to act as securities depositary
               with respect to such Security of Series No. {   } or the Company
               becomes aware that the Depositary has ceased to be a clearing
               agency registered under the Securities Exchange Act of 1934, as
               amended, and, in any such case, the Trustee shall not have been
               notified by the Company within ninety (90) days of the identity
               of a successor securities depositary with respect to such
               Security of Series No. {   };

                    (B)  The Company shall have delivered to the Trustee a
               Company Order to the effect that such Security of Series No. 
               {   } shall be so exchangeable on and after a date specified 
               therein; or

                    (C)  (1) an Event of Default shall have occurred and be
               continuing, (2) the Trustee shall have given notice of such Event
               of Default pursuant to Section 1102 of the Original Indenture and
               (3) there shall have been delivered to the Company and the
               Trustee an Opinion of 


                                     -7-

<PAGE>

               Counsel to the effect that the interests of the beneficial owners
               of such Security of Series No. {   } in respect thereof will be
               materially impaired unless such owners become Holders of 
               certificated notes.]

               (r)  not applicable;

               (s)  no service charge shall be made for the registration of
          transfer or exchange of any Securities of Series No. [   ] [, or any
          Tranche thereof;] provided, however, that the Company may require
          payment of a sum sufficient to cover any tax or other governmental
          charge payable in connection with any such exchange or transfer;

               (t)  not applicable;

               (u)  [(i) if the Company shall have caused the Company's
          indebtedness in respect of any Security of Series No. {___} to have
          been satisfied and discharged prior to the Maturity of such Security
          of Series No. {___}, as provided in Section 901 of the Original
          Indenture, the Company shall, promptly after the date of such
          satisfaction and discharge, give a notice to each Person who was a
          Holder of any such Security of Series No. {___} on such date stating
          (A)(1) the aggregate principal amount of such Security of Series No.
          {___} and (2) the aggregate amount of any money (other than amounts,
          if any, deposited in respect of accrued interest on such Security of
          Series No. {___}) and the aggregate principal amount of, the rate or
          rates of interest on, and the aggregate fair market value of, any
          Eligible Obligations deposited pursuant to Section 901 of the Original
          Indenture with respect to such Security of Series No. {___} and (B)
          that the Company will provide (and the Company shall promptly so
          provide) to such Person, or any beneficial owner of such Security of
          Series No. {___} holding through such Person (upon written request to
          the Company sent to an address specified in such notice), such other
          information as such Person or beneficial owner, as the case may be,
          reasonably may request in order to enable it to determine the federal
          income tax consequences to it resulting from the satisfaction and
          discharge of the Company's indebtedness in respect of such Security of
          Series No. {   }. Thereafter, the Company shall, within forty-five
          (45) days after the end of each calendar year, give to each Person who
          at any time during such calendar year was a Holder of such Security of
          Series No. {   } a notice containing (X) such information as may be
          necessary to enable such Person to report its income, gain or loss for
          federal income tax purposes with respect to such Security of Series
          No. {   } or the assets held on deposit in respect thereof during such
          calendar year or the portion thereof during which such Person was a
          Holder of such Security of Series No. {   }, as the case may be (such
          information to be set 


                                     -8-

<PAGE>

          forth for such calendar year as a whole and for each month during such
          year) and (Y) a statement to the effect that the Company will provide
          (and the Company shall promptly so provide) to such Person, or any 
          beneficial owner of such Security of Series No. {   } holding through
          such Person (upon written request to the Company sent to an address
          specified in such notice), such other information as such Person or
          beneficial owner, as the case may be, reasonably may request in order
          to enable it to determine its income, gain or loss for federal income
          tax purposes with respect to such Security of Series No. {   } or 
          such assets for such year or portion thereof, as the case may be.  
          The obligation of the Company to provide or cause to be provided 
          information for purposes of income tax reporting by any Person as 
          described in the first two sentences of this paragraph shall be deemed
          to have been satisfied to the extent that the Company has provided or
          caused to be provided substantially comparable information pursuant 
          to any requirements of the Internal Revenue Code of 1986, as amended 
          from time to time (the "Code"), and United States Treasury regulations
          thereunder.

               (ii)  Notwithstanding the provisions of subparagraph (i) above,
          the Company shall not be required to give any notice specified in such
          subparagraph or to otherwise furnish any of the information
          contemplated therein if the Company shall have delivered to the
          Trustee an Opinion of Counsel to the effect that the Holder of such
          Security of Series No. {   } will not recognize income, gain or loss
          for federal income tax purposes as a result of the satisfaction and
          discharge of the Company's indebtedness in respect of such Security of
          Series No. {   } and such Holder will be subject to federal income
          taxation on the same amounts and in the same manner and at the same
          times as if such satisfaction and discharge had not occurred.

               (iii) Anything in this clause (u) to the contrary
          notwithstanding, the Company shall not be required to give any notice
          specified in subparagraph (i) or to otherwise furnish the information
          contemplated therein or to deliver any Opinion of Counsel contemplated
          by subparagraph (ii) if the Company shall have caused the applicable
          Security of Series No. {   } to be deemed to have been paid for
          purposes of the Indenture, as provided in Section 901 of the Original
          Indenture, but shall not have effected the satisfaction and discharge
          of its indebtedness in respect of such Security of Series No. {   }
          pursuant to such Section.]

               (v)   each Security of Series No. [   ] shall be substantially in
          the form attached as Exhibit A hereto and shall have such further
          terms as are set forth in such form.


                                     -9-

<PAGE>

                                     ARTICLE TWO

                               Miscellaneous Provisions

          This Supplemental Indenture No. [   ] is a supplement to the 
Original Indenture. As previously supplemented and further supplemented by 
this Supplemental Indenture No. [   ], the Original Indenture is in all 
respects ratified, approved and confirmed, and the Original Indenture, all 
previous supplements thereto and this Supplemental Indenture No. [   ] shall 
together constitute one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental 
Indenture No. [   ] to be duly executed as of the day and year first above 
written.

                                       PUBLIC SERVICE COMPANY OF
                                        COLORADO



                                       By:
                                          ------------------------------------
                                          [Name]
                                          Executive Vice President


                                       FIRST TRUST OF NEW YORK
                                        NATIONAL ASSOCIATION, Trustee



                                       By:
                                          ------------------------------------
                                          [Name]
                                         Vice President







                                    -10-

<PAGE>


STATE OF COLORADO             )
                              )  ss.:
CITY AND COUNTY OF DENVER     )



          On the _____ day of __________ 1997, before me personally came
_________________ _____________, to me known, who, being by me duly sworn, did
depose and say that [    ] is a _________________________ of Public Service
Company of Colorado, one of the corporations described in and which executed the
foregoing instrument; and that [     ] signed [     ] name thereto by authority
of the Board of Directors of said corporation.




                                       --------------------------------------
                                                    Notary Public













                                    -11-

<PAGE>

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



          On the _____ day of ______________, 1997, before me personally came
_________________________, to me known, who, being by me duly sworn, did depose
and say that [     ] is a _________________________ of First Trust of New York,
National Association, the national banking association described in and which
executed the foregoing instrument; and that [     ] signed [     ] name thereto
by authority of the Board of Directors of said national banking corporation.




                                       --------------------------------------
                                                    Notary Public













                                    -12-

<PAGE>

                                                                    EXHIBIT A-1
                                   FORM OF SECURITY

(See legend at the end of this Security for restrictions on transfer and change
of form)


                      PUBLIC SERVICE COMPANY OF COLORADO

                 First Collateral Trust Bond, Series No. {  }




[Original Interest Accrual Date:]                Regular Record Dates:
Interest Rate: 
Default Rate:  
Stated Maturity:    
Interest Payment Dates:

                                                 {OID:  Yes __ No__
                                                 Total Amount of OID (%):
                                                 Yield to Maturity (%):
                                                 Initial Accrual Period OID (%):
                                                 (Constant - Yield Method)}

                     [This Security is not a Discount Security
               within the meaning of the within-mentioned Indenture.]

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

Principal Amount                                           Registered No.
$                                                          CUSIP

          PUBLIC SERVICE COMPANY OF COLORADO, a corporation duly organized and
existing under the laws of the State of Colorado (herein called the "Company,"
which term includes any successor corporation under the Indenture referred to
below), for value received, hereby promises to pay to

          , or registered assigns, the principal sum of

          Dollars on the Stated Maturity specified above [(or any Redemption
Date or Repayment Date as defined below)], and to pay interest thereon from the
Original Interest Accrual Date specified above or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, semi-annually
in arrears on the Interest Payment Dates 


                                     A-1

<PAGE>

specified above in each year, commencing with the Interest Payment Date next 
succeeding the Original Interest Accrual Date specified above, and at 
Maturity, at the Interest Rate per annum specified above, computed on the 
basis of a 360-day year consisting of twelve 30-day months, until the 
principal hereof is paid or duly provided for and, to the extent that payment 
of such interest shall be legally enforceable, at the Default Rate per annum 
specified above on any overdue payment of principal, [premium, if any,] 
and/or interest.  The interest so payable, and paid or duly provided for, on 
any Interest Payment Date shall, as provided in such Indenture, be paid to 
the Person in whose name this Security (or one or more Predecessor 
Securities) is registered at the close of business on the Regular Record Date 
specified above (whether or not a Business Day) next preceding such Interest 
Payment Date.  Notwithstanding the foregoing, interest payable at Maturity 
shall be paid to the Person to whom principal shall be paid.  Except as 
otherwise provided in said Indenture, any such interest not so paid or duly 
provided for shall forthwith cease to be payable to the Holder on such 
Regular Record Date and may either be paid to the Person in whose name this 
Security (or one or more Predecessor Securities) is registered at the close 
of business on a Special Record Date for the payment of such Defaulted 
Interest to be fixed by the Trustee, notice of which shall be given to 
Holders of Securities of this series not less than 15 days prior to such 
Special Record Date, or paid in such other manner as permitted by the 
Indenture.

          Payment of the principal of [and premium, if any, on] this Security
and interest hereon at Maturity shall be made upon presentation of this Security
at the Corporate Trust Office of First Trust of New York, National Association,
in New York, New York or at such other office or agency as may be designated for
such purpose by the Company from time to time.  Payment of interest on this
Security (other than interest at Maturity) shall be made by check mailed to the
address of the Person entitled thereto as such address shall appear in the
Security Register, except that if such Person shall be a securities depositary,
such payment may be made by such other means in lieu of check as shall be agreed
upon by the Company, the Trustee and such Person.  Payment of the principal of
[and premium, if any,] and interest on this Security, as aforesaid, shall be
made in such coin or currency of the United States of America as at the time of
payment shall be legal tender for the payment of public and private debts.

          This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and issuable in one or more
series under and equally secured by an Indenture, dated as of October 1, 1993
(such Indenture as originally executed and delivered and as supplemented or
amended from time to time thereafter, together with any constituent instruments
establishing the terms of particular securities, being herein called the
"Indenture"), between the Company and First Trust of New York, National
Association, as successor trustee (herein called the "Trustee," which term
includes any further successor trustee under the Indenture), to which Indenture
and all indentures supplemental thereto reference is hereby made for a
description of the property mortgaged, pledged and held in trust, the nature and
extent of the security and the respective rights, limitations of rights, duties


                                     A-2

<PAGE>

and immunities of the Company, the Trustee and the Holders of the Securities
thereunder and of the terms and conditions upon which the Securities are, and
are to be, authenticated and delivered and secured.  The acceptance of this
Security shall be deemed to constitute the consent and agreement by the Holder
hereof to all of the terms and provisions of the Indenture.  This Security is
one of the series designated above.

          If any Interest Payment Date[, any Redemption Date] or the Stated
Maturity shall not be a Business Day (as hereinafter defined), payment of the
amounts due on this Security on such date may be made on the next succeeding
Business Day; and, if such payment is made or duly provided for on such Business
Day, no interest shall accrue on such amounts for the period from and after such
Interest Payment Date[, Redemption Date] or Stated Maturity, as the case may be,
to such Business Day.

          [This Security is not subject to redemption prior to the Stated
Maturity hereof.]

          [This Security is subject to redemption at any time on or after
______, as a whole at any time or from time to time in part, at the option of
the Company, at a redemption price equal to the principal amount hereof, plus
accrued interest to the date fixed for redemption, together with the applicable
premium, equal to a percentage of the principal amount hereof, set forth in the
table below:










                                     A-3

<PAGE>

<TABLE>
                    If Redeemed in the             If Redeemed in the
                  12 Month Period Ending         12 Month Period Ending
                    on the last day of             on the last day of

              _____________       Premium    _____________       Premium
              <S>                 <C>        <C>                 <C>
              20__                  __%      20__                  __%
              20__                  __%      20__                  __%

              20__                  __%      20__                  __%

              20__                  __%      20__                  __%

              20__                  __%      20__                  __%
              20__                  __%      20__ and thereafter   __%]
</TABLE>

          [Notwithstanding the foregoing, the Company may not, prior to _____,
redeem this Security as contemplated above as a part of, or in anticipation of,
any refunding operation by the application, directly or indirectly, of moneys
borrowed having an effective interest cost to the Company (calculated in
accordance with generally accepted financial practice) less than the effective
interest cost to the Company (similarly calculated) of this Security.]

          [Insert provisions, if any, for redemption pursuant to a sinking fund
or analogous provision or at the option of the holder.]

          [Notice of redemption shall be given by mail to the Holder of this
Security, not less than 30 days nor more than 60 days prior to the date fixed
for redemption, all as provided in the Indenture.  As provided in the Indenture,
notice of redemption at the election of the Company as aforesaid may state that
such redemption shall be conditional upon the receipt by the Paying Agent or
Agents for this Security, on or prior to the date fixed for such redemption, of
money sufficient to pay the principal of and premium, if any, and interest, on
this Security; a notice of redemption so conditioned shall be of no force or
effect if such money is not so received and, in such event, the Company shall
not be required to redeem this Security].

          [In the event of redemption of this Security in part only, a new
Security or Securities of this series, of like tenor, for the unredeemed portion
hereof and otherwise having the same terms as this Security will be issued in
the name of the Holder hereof upon the cancellation hereof.]

          If an Event of Default shall occur and be continuing, the principal of
this Security may be declared due and payable in the manner and with the effect
provided in the Indenture.


                                     A-4

<PAGE>

          The Indenture permits, with certain exceptions as therein provided,
the Trustee to enter into one or more supplemental indentures for the purpose of
adding any provisions to, or changing in any manner or eliminating any of the
provisions of, the Indenture 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 the Indenture, considered as one class; provided, however,
that if there shall be Securities of more than one series Outstanding under the
Indenture and if a proposed supplemental indenture shall directly affect the
rights of the Holders of Securities of one or more, but less 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 less 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 the Indenture permits the Trustee to enter into one or more supplemental
indentures for limited purposes without the consent of any Holders of
Securities.  The Indenture also contains provisions permitting the Holders of a
majority in principal amount of the Securities then Outstanding, on behalf of
the Holders of all Securities, to waive compliance by the Company with certain
provisions of the Indenture and certain past defaults under the Indenture and
their consequences.  Any such consent or waiver by the Holder of this Security
shall be conclusive and binding upon such Holder and upon all future Holders of
this Security and of any Security issued upon the registration of transfer
hereof or in exchange therefor or in lieu hereof, whether or not notation of
such consent or waiver is made upon this Security.

          As provided in the Indenture and subject to certain limitations
therein set forth, this Security or any portion of the principal amount hereof
will be deemed to have been paid for all purposes of the Indenture and to be no
longer Outstanding thereunder, and, at the election of the Company, the
Company's entire indebtedness in respect thereof will be satisfied and
discharged, if there has been irrevocably deposited with the Trustee or any
Paying Agent (other than the Company), in trust, money in an amount which will
be sufficient and/or Eligible Obligations, the principal of and interest on
which when due, without regard to any reinvestment thereof, will provide moneys
which, together with moneys so deposited, will be sufficient, to pay when due
the principal of and [premium, if any, and] interest on this Security when due.

          As provided in the Indenture and subject to certain limitations
therein set forth, the transfer of this Security is registrable in the Security
Register, upon surrender of this Security for registration of transfer at the
Corporate Trust Office of First Trust of New York, National Association, in New
York, New York or such other office or agency as may be designated by the
Company from time to time, duly endorsed by, or accompanied by a written
instrument of transfer in form satisfactory to the Company and the Security
Registrar duly 


                                     A-5

<PAGE>

executed by, the Holder hereof or his attorney duly authorized in writing, 
and thereupon one or more new Securities of this series of authorized 
denominations and of like tenor and aggregate principal amount, will be 
issued to the designated transferee or transferees.

          The Securities of this series are issuable only as registered
Securities, without coupons, and in denominations of $1,000 and integral
multiples thereof.  As provided in the Indenture and subject to certain
limitations therein set forth, the Securities of this series are exchangeable
for a like aggregate principal amount of Securities of the same series and
Tranche, of any authorized denominations, as requested by the Holder
surrendering the same, and of like tenor upon surrender of the Security or
Securities to be exchanged at the Corporate Trust Office of First Trust of New
York, National Association, in New York, New York or such other office or agency
as may be designated by the Company from time to time.

          [The Company shall not be required to execute or provide for the
registration of transfer of or the exchange of (a) Securities of this series
during a period of 15 day immediately preceding the date notice is given
identifying the serial numbers of the Securities of this series called for
redemption or (b) any Security so selected for redemption in whole or in part,
except the unredeemed portion of any Security being redeemed in part.]

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

          Prior to due presentment of this 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 this Security is registered as the absolute
owner hereof for all purposes, whether or not this Security be overdue, and
neither the Company, the Trustee nor any such agent shall be affected by notice
to the contrary.

          The Indenture and the Securities shall be governed by and construed in
accordance with the laws of the State of New York.

          As used herein "Business Day" means any day, other than a Saturday or
Sunday, which is not a day on which banking institutions or trust companies in
The City of New York, New York or other city in which is located any office or
agency maintained for the payment of the principal of, or premium, if any, or
interest on this Security, are generally authorized or required by law,
regulation or executive order to remain closed.  All other terms used in this
Security which are defined in the Indenture shall have the meanings assigned to
them in the Indenture.

          As provided in the Indenture, no recourse shall be had for the payment
of the principal of[, premium, if any,] or interest on any Securities, or any
part thereof, or for any 


                                     A-6

<PAGE>

claim based thereon or otherwise in respect thereof, or of the indebtedness 
represented thereby, or upon any obligation, covenant or agreement under the 
Indenture, against, and no personal liability whatsoever shall attach to, or 
be incurred by, any incorporator, shareholder, officer or director, as such, 
past, present or future of the Company or of any predecessor or successor 
corporation (either directly or through the Company or a predecessor or 
successor corporation), whether by virtue of any constitutional provision, 
statute or rule of law, or by the enforcement of any assessment or penalty or 
otherwise; it being expressly agreed and understood that the Indenture and 
all the Securities are solely corporate obligations and that any such 
personal liability is hereby expressly waived and released as a condition of, 
and as part of the consideration for, the execution of the Indenture and the 
issuance of the Securities.

          Unless the certificate of authentication hereon has been executed by
the Trustee or an Authenticating Agent by manual signature, this Security shall
not be entitled to any benefit under the Indenture or be valid or obligatory for
any purpose.













                                     A-7

<PAGE>

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


                              PUBLIC SERVICE COMPANY OF
                                COLORADO



                              By:
                                  ------------------------------------------
                                  Executive Vice President

Attest:


- ------------------------
Secretary

                                       
                         CERTIFICATE OF AUTHENTICATION

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

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

FIRST TRUST OF NEW YORK,        OR        FIRST TRUST OF NEW YORK,
NATIONAL ASSOCIATION,                     NATIONAL ASSOCIATION, 
AS TRUSTEE                                AS TRUSTEE

By:                                       By:  [                     ]
   ----------------------                    ---------------------------
                                               AS AUTHENTICATING AGENT

                                          By:                 
                                             ---------------------------
                                                 Authorized Officer

          UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED 
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION 
("DTC"), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, 
OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & 
CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF 
DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS 
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR 
OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO 

                                     A-8
<PAGE>

ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., 
HAS AN INTEREST HEREIN.

          THIS SECURITY MAY NOT BE TRANSFERRED OR EXCHANGED, NOR MAY ANY 
PURPORTED TRANSFER BE REGISTERED, EXCEPT (i) THIS SECURITY MAY BE TRANSFERRED 
IN WHOLE, AND APPROPRIATE REGISTRATION OF TRANSFER EFFECTED, IF SUCH TRANSFER 
IS BY CEDE & CO., AS NOMINEE FOR THE DEPOSITORY TRUST COMPANY (THE 
"DEPOSITARY"), TO THE DEPOSITARY, OR BY THE DEPOSITARY TO ANOTHER NOMINEE 
THEREOF, OR BY ANY NOMINEE OF THE DEPOSITARY TO ANY OTHER NOMINEE THEREOF, OR 
BY THE DEPOSITARY OR ANY NOMINEE THEREOF TO ANY SUCCESSOR SECURITIES 
DEPOSITARY OR ANY NOMINEE THEREOF; AND (ii) THIS SECURITY MAY BE EXCHANGED 
FOR DEFINITIVE SECURITIES REGISTERED IN THE RESPECTIVE NAMES OF THE 
BENEFICIAL HOLDERS HEREOF, AND THEREAFTER SHALL BE TRANSFERABLE WITHOUT 
RESTRICTIONS IF: (A) THE DEPOSITARY, OR ANY SUCCESSOR SECURITIES DEPOSITARY, 
SHALL HAVE NOTIFIED THE COMPANY AND THE TRUSTEE THAT IT IS UNWILLING OR 
UNABLE TO CONTINUE TO ACT AS SECURITIES DEPOSITARY WITH RESPECT TO THE 
SECURITIES OR THE COMPANY BECOMES AWARE THAT THE DEPOSITARY HAS CEASED TO BE 
A CLEARING AGENCY REGISTERED UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS 
AMENDED, AND IN ANY SUCH CASE THE TRUSTEE SHALL NOT HAVE BEEN NOTIFIED BY THE 
COMPANY WITHIN NINETY (90) DAYS OF THE IDENTITY OF A SUCCESSOR SECURITIES 
DEPOSITARY WITH RESPECT TO THE SECURITIES; (B) THE COMPANY SHALL HAVE 
DELIVERED TO THE TRUSTEE AN OFFICER'S CERTIFICATE TO THE EFFECT THAT THE 
SECURITIES SHALL BE SO EXCHANGEABLE ON AND AFTER A DATE SPECIFIED THEREIN; OR 
(C)(1) AN EVENT OF DEFAULT SHALL HAVE OCCURRED AND BE CONTINUING, (2) THE 
TRUSTEE SHALL HAVE GIVEN NOTICE OF SUCH EVENT OF DEFAULT PURSUANT TO SECTION 
1102 OF THE INDENTURE AND (3) THERE SHALL HAVE BEEN DELIVERED TO THE COMPANY 
AND THE TRUSTEE AN OPINION OF COUNSEL TO THE EFFECT THAT THE INTERESTS OF THE 
BENEFICIAL OWNERS OF THE SECURITIES IN RESPECT THEREOF WILL BE MATERIALLY 
IMPAIRED UNLESS SUCH OWNERS BECOME HOLDERS OF DEFINITIVE SECURITIES.

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

                                     A-9
<PAGE>

          FOR VALUE RECEIVED the undersigned hereby sells, assigns and 
transfers unto

- -------------------------------------------------------------------------------
    [please insert social security or other identifying number of assignee]
                                       
- -------------------------------------------------------------------------------
            [please print or typewrite name and address of assignee]

- -------------------------------------------------------------------------------
the within Security of PUBLIC SERVICE COMPANY OF COLORADO and does hereby
irrevocably constitute and appoint ______________________________, Attorney, to
transfer said Security on the books of the within-mentioned Company, with full
power of substitution in the premises.

Dated:  
        ------------------
                              ---------------------------------------
                              Notice:  The signature to this assignment must
                              correspond with the name as written upon the face
                              of the Security in every particular without
                              alteration or enlargement or any change
                              whatsoever.

                                     A-10
<PAGE>

                                                                    EXHIBIT A-2

                                FORM OF SECURITY
                 (See legend at the end of this Security for
                 restrictions on transfer and change of form)
                                       
                                       
                      PUBLIC SERVICE COMPANY OF COLORADO
                                       
                    Secured Medium-Term Note, Series {   }
                    (being a First Collateral Trust Bond)
                                       
                                       
                                       
Original Issue Date:                    Regular Record Dates:
Interest Rate:                          Initial Redemption Date:
Default Rate:                           Initial Redemption Percentage:
Stated Maturity:                        Annual Redemption Percentage Reduction:
Interest Payment Dates:                 Optional Repayment Dates:
Addendum Attached   
[  ]Yes                                 Other/Additional Provisions:
[  ] No   
     

                     This Note is not a Discount Security
            within the meaning of the within-mentioned Indenture.

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

Principal Amount                                  Registered No.
$                                                 CUSIP

          PUBLIC SERVICE COMPANY OF COLORADO, a corporation duly organized 
and existing under the laws of the State of Colorado (herein called the 
"Company," which term includes any successor corporation under the Indenture 
referred to below), for value received, hereby promises to pay to, 

          or registered assigns, the principal sum of

          Dollars on the Stated Maturity specified above (or any Redemption 
Date or Repayment Date as defined below), and to pay interest thereon from 
the Original Issue Date specified above or from the most recent Interest 
Payment Date to which interest has been paid or duly provided for, 
semi-annually in arrears on the Interest Payment Dates specified above in 

                                     B-1
<PAGE>

each year, commencing with the Interest Payment Date next succeeding the 
Original Issue Date specified above, and at Maturity, at the Interest Rate 
per annum specified above, computed on the basis of a 360-day year consisting 
of twelve 30-day months, until the principal hereof is paid or duly provided 
for and, to the extent that payment of such interest shall be legally 
enforceable, at the Default Rate per annum specified above on any overdue 
payment of principal, premium, if any, and/or interest.  The interest so 
payable, and paid or duly provided for, on any Interest Payment Date shall, 
as provided in such Indenture, be paid to the Person in whose name this Note 
(or one or more Predecessor Securities) is registered at the close of 
business on the Regular Record Date specified above (whether or not a 
Business Day) next preceding such Interest Payment Date except that if the 
Original Issue Date of this Note is after the Regular Record Date specified 
above and before the corresponding Interest Payment Date, the first payment 
of interest on this Note shall be made to the Person in whose name this Note 
(or one or more Predecessor Securities) is registered at the close of 
business on the Regular Record Date with respect to the next succeeding 
Interest Payment Date.  Notwithstanding the foregoing, interest payable at 
Maturity shall be paid to the Person to whom principal shall be paid.  Except 
as otherwise provided in said Indenture, any such interest not so paid or 
duly provided for shall forthwith cease to be payable to the Holder on such 
Regular Record Date and may either be paid to the Person in whose name this 
Note (or one or more Predecessor Securities) is registered at the close of 
business on a Special Record Date for the payment of such Defaulted Interest 
to be fixed by the Trustee, notice of which shall be given to Holders of 
Notes of this series not less than 15 days prior to such Special Record Date, 
or paid in such other manner as permitted by the Indenture.

          Notwithstanding the foregoing, if an Addendum is attached hereto or 
"Other/Additional Provisions" apply to this Note as specified on the face 
hereof, this Note shall be subject to the terms set forth in such Addendum or 
such "Other/Additional Provisions".

          Payment of the principal of and premium, if any, on this Note and 
interest hereon at Maturity shall be made upon presentation of this Note (and 
with respect to any applicable repayment of this Note, a duly completed 
election form as contemplated below) at the Corporate Trust Office of First 
Trust of New York, National Association, in New York, New York or at such 
other office or agency as may be designated for such purpose by the Company 
from time to time. Payment of interest on this Note (other than interest at 
Maturity) shall be made by check mailed to the address of the Person entitled 
thereto as such address shall appear in the Security Register, except that if 
such Person shall be a securities depositary, such payment may be made by 
such other means in lieu of check as shall be agreed upon by the Company, the 
Trustee and such Person. Payment of the principal of and premium, if any, and 
interest on this Note, as aforesaid, shall be made in such coin or currency 
of the United States of America as at the time of payment shall be legal 
tender for the payment of public and private debts.

                                      B-2
<PAGE>

          This Note is one of a duly authorized issue of securities of the 
Company (herein called the "Notes"), issued and issuable in one or more 
series under and equally secured by an Indenture, dated as of October 1, 1993 
(such Indenture as originally executed and delivered and as supplemented or 
amended from time to time thereafter, together with any constituent 
instruments establishing the terms of particular securities, being herein 
called the "Indenture"), between the Company and First Trust of New York, 
National Association, as successor trustee (herein called the "Trustee," 
which term includes any further successor trustee under the Indenture), to 
which Indenture and all indentures supplemental thereto reference is hereby 
made for a description of the property mortgaged, pledged and held in trust, 
the nature and extent of the security and the respective rights, limitations 
of rights, duties and immunities of the Company, the Trustee and the Holders 
of the Securities thereunder and of the terms and conditions upon which the 
Securities are, and are to be, authenticated and delivered and secured.  The 
acceptance of this Note shall be deemed to constitute the consent and 
agreement by the Holder hereof to all of the terms and provisions of the 
Indenture.  This Note is one of the series designated above.

          If any Interest Payment Date, any Redemption Date or the Stated 
Maturity shall not be a Business Day (as hereinafter defined), payment of the 
amounts due on this Note on such date may be made on the next succeeding 
Business Day; and, if such payment is made or duly provided for on such 
Business Day, no interest shall accrue on such amounts for the period from 
and after such Interest Payment Date, Redemption Date or Stated Maturity, as 
the case may be, to such Business Day.

          Unless otherwise specified in an Addendum attached hereto, this 
Note shall not be subject to any sinking fund or other mandatory redemption 
and, unless otherwise specified on the face hereof in accordance with the 
provisions of the following four paragraphs, this Note is not subject to 
optional redemption or repayment prior to the Stated Maturity hereof.

          This Note is subject to redemption at the option of the Company at 
any time on or after the Initial Redemption Date, if any, specified on the 
face hereof, as a whole at any time or from time to time in part, in 
increments of $1,000 (provided that any remaining principal amount hereof 
shall be at least $100,000), at the Redemption Price (as defined below), plus 
unpaid accrued interest hereon to the date fixed for redemption (each, a 
"Redemption Date"). The "Redemption Price" shall initially be the Initial 
Redemption Percentage specified on the face hereof multiplied by the unpaid 
principal amount of this Note to be redeemed.  The Initial Redemption 
Percentage shall decline at each anniversary of the Initial Redemption Date 
by the Annual Redemption Percentage, if any, specified on the face hereof 
until the Redemption Price is 100% of the unpaid principal amount to be 
redeemed.

          Notice of redemption shall be given by mail to the Holder of this 
Note, not less than 30 days nor more than 60 days prior to the date fixed for 
redemption, all as provided in the Indenture.  As provided in the Indenture, 
notice of redemption at the election of the 

                                      B-3
<PAGE>

Company as aforesaid may state that such redemption shall be conditional upon 
the receipt by the Paying Agent or Agents for this Note, on or prior to the 
date fixed for such redemption, of money sufficient to pay the principal of 
and premium, if any, and interest, on this Note; a notice of redemption so 
conditioned shall be of no force or effect if such money is not so received 
and, in such event, the Company shall not be required to redeem this Note.

          In the event of redemption of this Note in part only, a new Note or 
Notes of this series, of like tenor, for the unredeemed portion hereof and 
otherwise having the same terms as this Note will be issued in the name of 
the Holder hereof upon the cancellation hereof.

          This Note will be subject to repayment by the Company at the option 
of the Holder hereof on the Optional Repayment Date(s), if any, specified on 
the face hereof, in whole or in part in increments of $1,000 (provided that 
any remaining principal amount hereof shall be at least $100,000), at a 
repayment price equal to 100% of the unpaid principal amount to be repaid, 
plus unpaid interest accrued hereon to the date fixed for repayment (each a 
"Repayment Date").  For this Note to be repaid, this Note must be received 
not more than 60 nor less than 30 calendar days prior to the Repayment Date, 
together with the form hereon entitled "Option to Elect Repayment" duly 
completed, by the Trustee at its Corporate Trust Office in New York, New York 
or such other office or agency as may be designated by the Company from time 
to time.  Exercise of such repayment option by the Holder hereof will be 
irrevocable.  In the event of repayment of this Note in part only, a new Note 
or Notes of like tenor for the unrepaid portion hereof and otherwise having 
the same terms as this Note will be issued in the name of the Holder hereof 
upon the cancellation hereof.

          If an Event of Default shall occur and be continuing, the principal 
of this Note may be declared due and payable in the manner and with the 
effect provided in the Indenture.

          The Indenture permits, with certain exceptions as therein provided, 
the Trustee to enter into one or more supplemental indentures for the purpose 
of adding any provisions to, or changing in any manner or eliminating any of 
the provisions of, the Indenture 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 the Indenture, considered as one class; provided, 
however, that if there shall be Securities of more than one series 
Outstanding under the Indenture and if a proposed supplemental indenture 
shall directly affect the rights of the Holders of Securities of one or more, 
but less 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 less 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 the Indenture 

                                      B-4
<PAGE>

permits the Trustee to enter into one or more supplemental indentures for 
limited purposes without the consent of any Holders of Securities.  The 
Indenture also contains provisions permitting the Holders of a majority in 
principal amount of the Securities then Outstanding, on behalf of the Holders 
of all Securities, to waive compliance by the Company with certain provisions 
of the Indenture and certain past defaults under the Indenture and their 
consequences.  Any such consent or waiver by the Holder of this Note shall be 
conclusive and binding upon such Holder and upon all future Holders of this 
Note and of any Note issued upon the registration of transfer hereof or in 
exchange therefor or in lieu hereof, whether or not notation of such consent 
or waiver is made upon this Note.

          As provided in the Indenture and subject to certain limitations 
therein set forth, this Note or any portion of the principal amount hereof 
will be deemed to have been paid for all purposes of the Indenture and to be 
no longer Outstanding thereunder, and, at the election of the Company, the 
Company's entire indebtedness in respect thereof will be satisfied and 
discharged, if there has been irrevocably deposited with the Trustee or any 
Paying Agent (other than the Company), in trust, money in an amount which 
will be sufficient and/or Eligible Obligations, the principal of and interest 
on which when due, without regard to any reinvestment thereof, will provide 
moneys which, together with moneys so deposited, will be sufficient, to pay 
when due the principal of and premium, if any, and interest on this Note when 
due.

          As provided in the Indenture and subject to certain limitations 
therein set forth, the transfer of this Note is registrable in the Security 
Register, upon surrender of this Note for registration of transfer at the 
Corporate Trust Office of First Trust of New York, National Association, in 
New York, New York or such other office or agency as may be designated by the 
Company from time to time, duly endorsed by, or accompanied by a written 
instrument of transfer in form satisfactory to the Company and the Security 
Registrar duly executed by, the Holder hereof or his attorney duly authorized 
in writing, and thereupon one or more new Notes of this series of authorized 
denominations and of like tenor and aggregate principal amount, will be 
issued to the designated transferee or transferees.

          The Notes of this series are issuable only as registered Notes, 
without coupons, and in denominations of $100,000 and in any greater amount 
in integral multiples of $1,000.  As provided in the Indenture and subject to 
certain limitations therein set forth, the Notes are exchangeable for a like 
aggregate principal amount of Notes of the same series and Tranche, of any 
authorized denominations, as requested by the Holder surrendering the same, 
and of like tenor upon surrender of the Note or Notes to be exchanged at the 
Corporate Trust Office of First Trust of New York, National Association, in 
New York, New York or such other office or agency as may be designated by the 
Company from time to time.

          The Company shall not be required to execute or provide for the 
registration of transfer of or the exchange of this Note during a period of 
15 days immediately preceding the 

                                      B-5
<PAGE>

date notice is given calling this Note or any part hereof for redemption, 
except with respect to the unredeemed portion of any Note being redeemed in 
part.

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

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

          The Indenture and the Notes shall be governed by and construed in 
accordance with the laws of the State of New York.

          As used herein "Business Day" means any day, other than a Saturday 
or Sunday, which is not a day on which banking institutions or trust 
companies in The City of New York, New York or other city in which is located 
any office or agency maintained for the payment of the principal of, or 
premium, if any, or interest on this Note, are generally authorized or 
required by law, regulation or executive order to remain closed.  All other 
terms used in this Note which are defined in the Indenture shall have the 
meanings assigned to them in the Indenture.

          As provided in the Indenture, no recourse shall be had for the 
payment of the principal of, premium, if any, or interest on any Securities, 
or any part thereof, or for any claim based thereon or otherwise in respect 
thereof, or of the indebtedness represented thereby, or upon any obligation, 
covenant or agreement under the Indenture, against, and no personal liability 
whatsoever shall attach to, or be incurred by, any incorporator, shareholder, 
officer or director, as such, past, present or future of the Company or of 
any predecessor or successor corporation (either directly or through the 
Company or a predecessor or successor corporation), whether by virtue of any 
constitutional provision, statute or rule of law, or by the enforcement of 
any assessment or penalty or otherwise; it being expressly agreed and 
understood that the Indenture and all the Securities are solely corporate 
obligations and that any such personal liability is hereby expressly waived 
and released as a condition of, and as part of the consideration for, the 
execution of the Indenture and the issuance of the Securities.

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

                                      B-6
<PAGE>

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


                                        PUBLIC SERVICE COMPANY OF
                                         COLORADO



                                        By:
                                            -------------------------------
                                            Executive Vice President


Attest:

- -----------------------------------
          Secretary


                            CERTIFICATE OF AUTHENTICATION

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


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

FIRST TRUST OF NEW YORK,           OR        FIRST TRUST OF NEW YORK,
NATIONAL ASSOCIATION,                        NATIONAL ASSOCIATION,
 AS TRUSTEE                                    AS TRUSTEE

By:                                          BY:  [         ]
   --------------------------------               AS AUTHENTICATING AGENT

                                             By:
                                                ---------------------------
                                                  Authorized Officer

          UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE COMPANY
OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY
CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME
AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE
TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO

                                     B-7
<PAGE>

ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO.,
HAS AN INTEREST HEREIN.

          THIS NOTE MAY NOT BE TRANSFERRED OR EXCHANGED, NOR MAY ANY PURPORTED
TRANSFER BE REGISTERED, EXCEPT (i) THIS NOTE MAY BE TRANSFERRED IN WHOLE, AND
APPROPRIATE REGISTRATION OF TRANSFER EFFECTED, IF SUCH TRANSFER IS BY CEDE &
CO., AS NOMINEE FOR THE DEPOSITORY TRUST COMPANY (THE "DEPOSITARY"), TO THE
DEPOSITARY, OR BY THE DEPOSITARY TO ANOTHER NOMINEE THEREOF, OR BY ANY NOMINEE
OF THE DEPOSITARY TO ANY OTHER NOMINEE THEREOF, OR BY THE DEPOSITARY OR ANY
NOMINEE THEREOF TO ANY SUCCESSOR SECURITIES DEPOSITARY OR ANY NOMINEE THEREOF;
AND (ii) THIS NOTE MAY BE EXCHANGED FOR DEFINITIVE NOTES REGISTERED IN THE
RESPECTIVE NAMES OF THE BENEFICIAL HOLDERS HEREOF, AND THEREAFTER SHALL BE
TRANSFERABLE WITHOUT RESTRICTIONS IF: (A) THE DEPOSITARY, OR ANY SUCCESSOR
SECURITIES DEPOSITARY, SHALL HAVE NOTIFIED THE COMPANY AND THE TRUSTEE THAT IT
IS UNWILLING OR UNABLE TO CONTINUE TO ACT AS SECURITIES DEPOSITARY WITH RESPECT
TO THE NOTES OR THE COMPANY BECOMES AWARE THAT THE DEPOSITARY HAS CEASED TO BE A
CLEARING AGENCY REGISTERED UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED, AND IN ANY SUCH CASE THE TRUSTEE SHALL NOT HAVE BEEN NOTIFIED BY THE
COMPANY WITHIN NINETY (90) DAYS OF THE IDENTITY OF A SUCCESSOR SECURITIES
DEPOSITARY WITH RESPECT TO THE NOTES; (B) THE COMPANY SHALL HAVE DELIVERED TO
THE TRUSTEE AN OFFICER'S CERTIFICATE TO THE EFFECT THAT THE NOTES SHALL BE SO
EXCHANGEABLE ON AND AFTER A DATE SPECIFIED THEREIN; OR (C)(1) AN EVENT OF
DEFAULT SHALL HAVE OCCURRED AND BE CONTINUING, (2) THE TRUSTEE SHALL HAVE GIVEN
NOTICE OF SUCH EVENT OF DEFAULT PURSUANT TO SECTION 1102 OF THE INDENTURE AND
(3) THERE SHALL HAVE BEEN DELIVERED TO THE COMPANY AND THE TRUSTEE AN OPINION OF
COUNSEL TO THE EFFECT THAT THE INTERESTS OF THE BENEFICIAL OWNERS OF THE NOTES
IN RESPECT THEREOF WILL BE MATERIALLY IMPAIRED UNLESS SUCH OWNERS BECOME HOLDERS
OF DEFINITIVE NOTES.

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




                                     B-8
<PAGE>

    FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto

- -------------------------------------------------------------------------------
    [please insert social security or other identifying number of assignee]

- -------------------------------------------------------------------------------
           [please print or typewrite name and address of assignee]

- -------------------------------------------------------------------------------
the within Note of PUBLIC SERVICE COMPANY OF COLORADO and does hereby
irrevocably constitute and appoint ______________________________, Attorney, to
transfer said Note on the books of the within-mentioned Company, with full power
of substitution in the premises.

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

                                        -----------------------------------
                                        NOTICE:  The signature to this
                                        assignment must correspond with the
                                        name as written upon the face of the
                                        Security in every particular without
                                        alteration or enlargement or any
                                        change whatsoever.


                                     B-9
<PAGE>

                           OPTION TO ELECT REPAYMENT

          The undersigned hereby irrevocably request(s) and instruct(s) the
Company to repay this Note (or portion hereof specified below) pursuant to its
terms at a price equal to 100% of the principal amount to be repaid, together
with unpaid interest accrued hereon to the Repayment Date, to the undersigned,
at ___________________________________________________________________________
        (Please print or typewrite name and address of the undersigned)

          For this Note to be repaid, the Trustee must receive at its Corporate
Trust Office in New York, New York not more than 60 nor less than 30 calendar
days prior to the Repayment Date, this Note with this "Option to Elect
Repayment" form duly completed.

          If less than the entire principal amount of this Note is to be repaid,
specify the portion hereof (which shall be increments of $1,000 (provided that
any remaining principal amount hereof shall be at least $100,000)) which the
Holder elects to have repaid and specify the denomination or denominations
(which shall be a minimum of $100,000) of the Notes to be issued to the Holder
for the portion of this Note not being repaid (in the absence of any such
specification, one such Note will be issued for the portion not being repaid).
Principal Amount
to be Repaid:  $
                -------------------     -----------------------------------

Date:                                   NOTICE:  The signature(s) on this Option
     ---------------                    to Elect Repayment must correspond with
                                        the name(s) as written upon the face of
                                        this Note in every particular, without
                                        alteration or enlargement or any change
                                        whatsoever.


                                     B-10
<PAGE>

                                                                    SCHEDULE A


                             SUPPLEMENTAL INDENTURES

<TABLE>
     Date of                                         Principal       Principal
  Supplemental                                        Amount           Amount
    Indenture             Series of Bonds             Issued        Outstanding
  ------------            ---------------            ---------      -----------
<S>                 <C>                             <C>            <C>
November 1, 1993            Series No. 1            $134,500,000   $134,500,000

January 1, 1994      Series No. 2 due 2001 and      $102,667,000   $102,667,000
                       Series No. 2 due 2024        $110,000,000   $110,000,000

September 2, 1994          Appointment of               None           None
                         Successor Trustee

May 1, 1996            Series No. 3 due 2006        $125,000,000   $125,000,000

November 1, 1996   Series No. 4 due from 9 months   $250,000,000   $250,000,000
                   to 30 years from date of issue

February 1, 1997   Series No. 5 due from 9 months   $150,000,000   $100,000,000
                   to 30 years from date of issue
</TABLE>

                                     B-11
<PAGE>

                                                                    SCHEDULE B

                             DESCRIPTION OF PROPERTY




                                     B-12


<PAGE>





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





                     PUBLIC SERVICE COMPANY OF COLORADO,
                                       
                                              AS ISSUER

                                      TO
                                       
                                       
                            THE BANK OF NEW YORK,
                                       
                                             AS TRUSTEE
                                       
                                       
                                       
                                       
                                       
                              _________________



                                   INDENTURE


                           SENIOR DEBT SECURITIES


                          DATED AS OF       , 1998


                              _________________





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

<PAGE>


                       PUBLIC SERVICE COMPANY OF COLORADO

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


Trust Indenture                                               Indenture Section
  Act Section

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

_______________

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

<PAGE>

                               TABLE OF CONTENTS
                                       

                                                                           Page
                                                                           ----
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
     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
     REDEMPTION DATE. . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     REDEMPTION PRICE . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     REGISTERED SECURITY. . . . . . . . . . . . . . . . . . . . . . . . . .  7
     REGULAR RECORD DATE. . . . . . . . . . . . . . . . . . . . . . . . . .  7
     RESPONSIBLE OFFICER. . . . . . . . . . . . . . . . . . . . . . . . . .  7


                                      -i-
<PAGE>

                                                                           Page
                                                                           ----
     SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     SECURITY REGISTER and SECURITY REGISTRAR . . . . . . . . . . . . . . .  7
     SPECIAL RECORD DATE. . . . . . . . . . . . . . . . . . . . . . . . . .  7
     STATED MATURITY. . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     TRANCHE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     TRUST INDENTURE ACT. . . . . . . . . . . . . . . . . . . . . . . . . .  7
     TRUSTEE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     U.S. GOVERNMENT OBLIGATIONS. . . . . . . . . . . . . . . . . . . . . .  8
     VICE PRESIDENT . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
SECTION 102.  Compliance Certificates and Opinions. . . . . . . . . . . . .  8
SECTION 103.  Form of Documents Delivered to Trustee. . . . . . . . . . . .  9
SECTION 104.  Acts of Holders . . . . . . . . . . . . . . . . . . . . . . . 10
SECTION 105.  Notices, Etc., to Trustee and Company . . . . . . . . . . . . 11
SECTION 106.  Notice to Holders; Waiver . . . . . . . . . . . . . . . . . . 11
SECTION 107.  Conflict with Trust Indenture Act . . . . . . . . . . . . . . 12
SECTION 108.  Effect of Headings and Table of Contents. . . . . . . . . . . 12
SECTION 109.  Successors and Assigns. . . . . . . . . . . . . . . . . . . . 12
SECTION 110.  Separability Clause . . . . . . . . . . . . . . . . . . . . . 13
SECTION 111.  Benefits of Indenture . . . . . . . . . . . . . . . . . . . . 13
SECTION 112.  Governing Law . . . . . . . . . . . . . . . . . . . . . . . . 13
SECTION 113.  Legal Holidays. . . . . . . . . . . . . . . . . . . . . . . . 13
SECTION 114.  No Recourse Against Others. . . . . . . . . . . . . . . . . . 13
                                       
                                  ARTICLE TWO

                                 Security Forms

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

                                 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 . . . . . 22
SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities. . . . . . . 24
SECTION 307.  Payment of Interest; Interest Rights Preserved. . . . . . . . 25
SECTION 308.  Persons Deemed Owners . . . . . . . . . . . . . . . . . . . . 27
SECTION 309.  Cancellation. . . . . . . . . . . . . . . . . . . . . . . . . 27
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. . . . . . . . . . . . . . . . . . 29

                                  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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SECTION 504.  Trustee May File Proofs of Claim. . . . . . . . . . . . . . . 33
SECTION 505.  Trustee May Enforce Claims Without Possession of 
              Securities. . . . . . . . . . . . . . . . . . . . . . . . . . 34
SECTION 506.  Application of Money Collected. . . . . . . . . . . . . . . . 34
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. . . . . . . . . . . . . . . . 36
SECTION 511.  Delay or Omission Not Waiver. . . . . . . . . . . . . . . . . 36
SECTION 512.  Control by Holders. . . . . . . . . . . . . . . . . . . . . . 37
SECTION 513.  Waiver of Past Defaults . . . . . . . . . . . . . . . . . . . 37
SECTION 514.  Undertaking for Costs . . . . . . . . . . . . . . . . . . . . 37
                                       
                                  ARTICLE SIX

                                  The Trustee

SECTION 601.  Certain Duties and Responsibilities of the Trustee. . . . . . 38
SECTION 602.  Notice of Defaults. . . . . . . . . . . . . . . . . . . . . . 38
SECTION 603.  Certain Rights of Trustee . . . . . . . . . . . . . . . . . . 39
SECTION 604.  Not Responsible for Recitals or Issuance of 
              Securities. . . . . . . . . . . . . . . . . . . . . . . . . . 40
SECTION 605.  May Hold Securities . . . . . . . . . . . . . . . . . . . . . 40
SECTION 606.  Money Held in Trust . . . . . . . . . . . . . . . . . . . . . 40
SECTION 607.  Compensation and Reimbursement. . . . . . . . . . . . . . . . 41
SECTION 608.  Disqualification; Conflicting Interests . . . . . . . . . . . 41
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


                                     -iii-
<PAGE>
                                       
                                                                           Page
                                                                           ----
SECTION 613.  Preferential Collection of Claims Against Company . . . . . . 45
SECTION 614.  Appointment of Authenticating Agent . . . . . . . . . . . . . 45

                                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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SECTION 703.  Reports by Trustee. . . . . . . . . . . . . . . . . . . . . . 49
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. . . . . . . . . . . . . . . . . . . . . . 51
SECTION 803.  Successor Corporation Substituted . . . . . . . . . . . . . . 51

                                 ARTICLE NINE

                            Supplemental Indentures

SECTION 901.  Supplemental Indentures Without Consent of Holders. . . . . . 52
SECTION 902.  Supplemental Indentures with Consent of Holders . . . . . . . 54
SECTION 903.  Execution of Supplemental Indentures. . . . . . . . . . . . . 55
SECTION 904.  Effect of Supplemental Indentures . . . . . . . . . . . . . . 56
SECTION 905.  Conformity with Trust Indenture Act . . . . . . . . . . . . . 56
SECTION 906.  Reference in Securities to Supplemental Indentures. . . . . . 56

                                 ARTICLE TEN

                                  Covenants

SECTION 1001. Payments of Securities. . . . . . . . . . . . . . . . . . . . 56
SECTION 1002. Maintenance of Office or Agency . . . . . . . . . . . . . . . 56
SECTION 1003. Corporate Existence . . . . . . . . . . . . . . . . . . . . . 57
SECTION 1004. Payment of Taxes and Other Claims . . . . . . . . . . . . . . 57
SECTION 1005. Compliance Certificates . . . . . . . . . . . . . . . . . . . 57
SECTION 1006. Commission Reports. . . . . . . . . . . . . . . . . . . . . . 58
SECTION 1007. Waiver of Stay, Extension or Usury Laws . . . . . . . . . . . 59
SECTION 1008. Money for Securities Payments to Be Held in Trust . . . . . . 59


                                     -iv-
<PAGE>
                                       
                                                                           Page
                                                                           ----

                                ARTICLE ELEVEN

                           Redemption of Securities

SECTION 1101. Applicability of Article. . . . . . . . . . . . . . . . . . . 61
SECTION 1102. Election to Redeem; Notice to Trustee . . . . . . . . . . . . 61
SECTION 1103. Selection by Trustee of Securities to Be Redeemed . . . . . . 61
SECTION 1104. Notice of Redemption. . . . . . . . . . . . . . . . . . . . . 62
SECTION 1105. Deposit of Redemption Price . . . . . . . . . . . . . . . . . 64
SECTION 1106. Securities Payable on Redemption Date . . . . . . . . . . . . 64
SECTION 1107. Securities Redeemed in Part . . . . . . . . . . . . . . . . . 64

                                ARTICLE TWELVE

                                 Sinking Funds

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

                               ARTICLE THIRTEEN

                       Defeasance and Covenant Defeasance

SECTION 1301. Applicability of Article; Company's Option to Effect
              Defeasance or Covenant Defeasance . . . . . . . . . . . . . . 66
SECTION 1302. Defeasance and Discharge. . . . . . . . . . . . . . . . . . . 66
SECTION 1303. Covenant Defeasance.. . . . . . . . . . . . . . . . . . . . . 67
SECTION 1304. Conditions to Defeasance or Covenant Defeasance . . . . . . . 67
SECTION 1305. Deposited Money and Government Obligations To Be 
              Held In Trust . . . . . . . . . . . . . . . . . . . . . . . . 69

                              ARTICLE FOURTEEN

                                Miscellaneous

SECTION 1401. Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . 70


                                     -v-
<PAGE>

          INDENTURE, dated as of            , 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 principal place of business at 101 Barclay Street, New York, New York.

                               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 senior
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>

          "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, New York, New
York.

          "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 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.


                                      -3-
<PAGE>

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


                                      -4-
<PAGE>

          "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 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 


                                      -5-
<PAGE>

Securities or any Affiliate of the Company or of such other obligor shall be 
disregarded and deemed not to be Outstanding, except that, in determining 
whether the Trustee shall be protected in relying upon any such request, 
demand, authorization, direction, notice, consent 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.

          "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.


                                      -6-
<PAGE>

          "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.

          "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. 


                                      -7-
<PAGE>

          "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) 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. 


                                      -8-
<PAGE>

          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 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.


                                      -9-
<PAGE>

          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 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 


                                      -10-
<PAGE>

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).

          (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:  [              ], 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


                                      -11-
<PAGE>

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. 

          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.


                                      -12-
<PAGE>

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. 

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, 


                                      -13-
<PAGE>

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 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

                                            By:  ___________________________
                                                     Authorized Signatory


                                      -14-
<PAGE>

                                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);

          (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 


                                      -15-
<PAGE>

     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; 

          (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; 


                                      -16-
<PAGE>

          (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;

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

          (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).

          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.


                                      -17-
<PAGE>

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 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.


                                      -18-

<PAGE>

          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:

          (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 

                                      -19-

<PAGE>

     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 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).

                                      -20-

<PAGE>

          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) 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.

                                      -21-

<PAGE>

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.  
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 

                                    -22-

<PAGE>

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 
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
     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.

                                    -23-

<PAGE>

          (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, 
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 deliver 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 

                                    -24-

<PAGE>

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 
deliver, 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. 

          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

                                    -25-

<PAGE>

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 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 

                                    -26-

<PAGE>

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 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 may be destroyed (and, if so destroyed, certification of their 
destruction shall be delivered to the Company, unless, by a Company Order, 
the Company shall direct that cancelled Securities be returned to it).

                                    -27-
<PAGE>

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, 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 

                                     -28-
<PAGE>

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 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.

                                    -29-

<PAGE>

                                    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
 
          (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 

                                    -30-

<PAGE>

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 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.

                                    -31-

<PAGE>

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 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 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 

                                    -32-

<PAGE>

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.

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

                                    -33-

<PAGE>

            (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 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 

                                    -34-

<PAGE>

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;

          (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.

                                    -35-

<PAGE>

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. 

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.

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.

                                    -36-
<PAGE>

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 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 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 


                                      -37-
<PAGE>

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:

          (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 


                                      -38-
<PAGE>

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 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 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 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 


                                      -39-
<PAGE>

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, if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.

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 


                                      -40-
<PAGE>

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 reasonable compensation
     for all services rendered by it hereunder (which compensation shall not be
     limited by any provision of law in regard to the compensation of a trustee
     of an express trust);

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

          (3)  to indemnify the Trustee for, and to hold it harmless against,
     any loss, liability, damage, claim or 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.


                                      -41-
<PAGE>

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 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 


                                      -42-
<PAGE>

     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 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 


                                      -43-
<PAGE>

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 (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, 


                                      -44-
<PAGE>

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
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


                                      -45-
<PAGE>

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 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 


                                      -46-
<PAGE>

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:

                         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.


                                      -47-
<PAGE>

                                 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;

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 


                                      -48-
<PAGE>

     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 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 


                                      -49-
<PAGE>

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 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 


                                      -50-
<PAGE>

     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 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 


                                      -51-
<PAGE>

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.

                                  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 


                                      -52-
<PAGE>

     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 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 


                                      -53-
<PAGE>

          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.

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 


                                      -54-
<PAGE>

     case of redemption, on or after the Redemption Date);

          (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

          (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).

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 


                                      -55-
<PAGE>

or permitted by this Indenture.  The Trustee may, but shall not be obligated 
to, enter into any such supplemental indenture which affects the Trustee's own 
rights, duties or immunities under this Indenture or otherwise.

SECTION 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 


                                      -56-
<PAGE>

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 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


                                      -57-
<PAGE>

     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 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


                                      -58-
<PAGE>

     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
     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 


                                      -59-
<PAGE>

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.

          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 


                                      -60-
<PAGE>

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 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 15 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 


                                      -61-
<PAGE>

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 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 45 days prior to the Redemption
Date, to each Holder of Securities 


                                      -62-
<PAGE>

to be redeemed, at his address appearing in the Security Register.

          All notices of redemption shall state:

          (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.


                                      -63-
<PAGE>

SECTION 1105.  DEPOSIT OF REDEMPTION PRICE.

          Prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1009) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest, 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. 


                                      -64-
<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 

                                      -65-
<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 

                                      -66-
<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. 
                                      -67-
<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
                                      -68-
<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, 


                                      -69-
<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

                                  MISCELLANEOUS

SECTION 1401.  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. 


                                      -70-
<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_______________________________
                                               Name: 
                                               Title: 



Attest:
 
______________________________
Name: 
Title: 


                                            THE BANK OF NEW YORK, 
                                                   as Trustee


                                            By_______________________________
                                               Name:  
                                               Title: 


Attest:

______________________________
Name: 
Title:  


                                      -71-

<PAGE>

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

                        PUBLIC SERVICE COMPANY OF COLORADO,
                                          
                                             AS ISSUER

                                         TO
                                          
                                          
                               THE BANK OF NEW YORK,
                                          
                                             AS TRUSTEE





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


                                  INDENTURE


                         SUBORDINATED DEBT SECURITIES


                        DATED AS OF             , 1998


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



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

<PAGE>

                          PUBLIC SERVICE COMPANY OF COLORADO

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

<TABLE>
<S>
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

                                                                            Page
                                                                            ----
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




















                                     -vi-
<PAGE>

          INDENTURE, dated as of _____________, 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 principal place of business at 101 Barclay Street, New 
York, New York.

                           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, New York, New York.

          "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 then a Depository 
hereunder, and if at any time there is more 

                                      -3-
<PAGE>

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:  [              ], 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

                              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 
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 deliver 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 deliver, 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 may be destroyed (and, if so destroyed, certification of their 
destruction shall be delivered to the Company, unless, by a Company Order, 
the Company shall direct that cancelled Securities be returned to it).

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

                                     -28-
<PAGE>

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

                                     -29-
<PAGE>

Agent under Section 614 and, if money or U.S. Government Obligations shall 
have been deposited with the Trustee pursuant 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, 

                                     -31-
<PAGE>

if any) shall not have 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 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) 

                                     -32-
<PAGE>

all existing Events of Default, other than the nonpayment of the 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 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 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, if it shall 
have reasonable grounds for believing that repayment of such funds or 
adequate indemnity against such risk or liability is not reasonably assured 
to it.

                                     -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 reasonable compensation
     for all services rendered by it hereunder (which compensation shall not be
     limited by any provision of law in regard to the compensation of a trustee
     of an express trust);

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

          (3)  to indemnify the Trustee for, and to hold it harmless against,
     any loss, liability, damage, claim or expense, including taxes (other than
     taxes based upon or 

                                     -41-
<PAGE>

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

                                     -42-
<PAGE>

          (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 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 

                                     -43-
<PAGE>

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 (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 

                                     -44-
<PAGE>

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 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 

                                     -45-
<PAGE>

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 this Section, such 
Authenticating Agent shall resign immediately in the manner and with the 
effect specified in this Section.

                                     -46-
<PAGE>

          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 


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     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.


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                                     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 


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<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.


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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


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<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.


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<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 


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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 


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<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


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     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.


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          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 


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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 15 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 


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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 45 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:


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          (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 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) accrued interest, if any, on, all the
Securities which are to be redeemed on that date.


                                    -64-

<PAGE>

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. 


                                  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 


                                    -65-

<PAGE>

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 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 


                                    -66-

<PAGE>

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 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 

                                     -67-
<PAGE>

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. 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 

                                     -68-
<PAGE>

          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 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 

                                     -69-
<PAGE>

          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, 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 

                                     -70-
<PAGE>

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.

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 

                                     -71-
<PAGE>

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 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, 

                                     -72-
<PAGE>

     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
     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 

                                     -73-
<PAGE>

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 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, 

                                     -74-
<PAGE>

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.

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.

                                     -75-
<PAGE>

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



Attest:

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


                                   THE BANK OF NEW YORK, 
                                           as Trustee


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


Attest:

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


                                     -77-

<PAGE>





                        ====================================
                                          
                                          
                            FIRST SUPPLEMENTAL INDENTURE
                                          
                            Dated as of _______ __, 1998
                                          
                                      between
                                          
                         PUBLIC SERVICE COMPANY OF COLORADO
                                          
                                     AS ISSUER
                                          
                                        and
                                          
                                THE BANK OF NEW YORK
                                          
                                     AS TRUSTEE
                                          
                                          
                       =====================================
                                           
                                          
<PAGE>

                                  TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                 Page
                                                                                 ----
<S>                                                                              <C>
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

III  REDEMPTION OF THE DEBENTURES. . . . . . . . . . . . . . . . . . . . . . . . . .6
     3.1. Special Event Redemption . . . . . . . . . . . . . . . . . . . . . . . . .6
     3.2. Optional Redemption by Company . . . . . . . . . . . . . . . . . . . . . .7
     3.3. No Sinking Fund. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

IV   EXTENSION OF INTEREST PAYMENT PERIOD. . . . . . . . . . . . . . . . . . . . . .8
     4.1. Extension of Interest Payment Period . . . . . . . . . . . . . . . . . . .8
     4.2. Notice of Extension. . . . . . . . . . . . . . . . . . . . . . . . . . . .9
     4.3. Limitation of Transactions . . . . . . . . . . . . . . . . . . . . . . . .9

V    EXPENSES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     5.1. Payment of Expenses. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     5.2. Payment Upon Resignation or Removal. . . . . . . . . . . . . . . . . . . 10

VI   SUBORDINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     6.1. Subordination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

VII  COVENANT TO LIST ON EXCHANGE. . . . . . . . . . . . . . . . . . . . . . . . . 11
     7.1. Listing on an Exchange . . . . . . . . . . . . . . . . . . . . . . . . . 11

VIII FORM OF DEBENTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1. Form of Debenture. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

IX   ORIGINAL ISSUE OF DEBENTURES. . . . . . . . . . . . . . . . . . . . . . . . . 20
     9.1. Original Issue of Debentures . . . . . . . . . . . . . . . . . . . . . . 20

                                       i

<PAGE>

X    MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     10.1.     Ratification of Indenture . . . . . . . . . . . . . . . . . . . . . 20
     10.2.     Trustee Not Responsible for Recitals. . . . . . . . . . . . . . . . 20
     10.3.     Governing Law . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     10.4.     Separability. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     10.5.     Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
</TABLE>

                                       ii

<PAGE>

          FIRST SUPPLEMENTAL INDENTURE, dated as of ____________, 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, as trustee (the "Trustee") 
under the Indenture dated as of __________, 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 ___% Deferrable Interest Subordinated Debentures due 
_________  (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 $___ million aggregate 
liquidation amount of its ___% Trust Originated Preferred Securities (the 
"Preferred Securities"), representing 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 $___ million aggregate liquidation amount of its ___% Trust 
Originated Common Securities, in $____ 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 
_________, 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 
"___% Deferrable Interest Subordinated Debentures due _____ ", limited in 
aggregate principal amount to $___ million, which amount shall be as set 
forth in any written order of the Company for the authentication and delivery 
of Debentures pursuant to Section 303 of the Indenture.

SECTION 2.2.   MATURITY.

          The Maturity Date of the Debentures is ____________, 20__.

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 $25 or integral multiples of $25.  Principal and interest on 
the Debentures issued in certificated form will be payable, the transfer of 
such Debentures will be registrable and such Debentures will be exchangeable 
for Debentures 

                                       3

<PAGE>

bearing identical terms and provisions at the office or agency 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 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 ___% 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.

                                     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 or 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 

                                       6

<PAGE>

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.  "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 _________, ____, 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").  Any redemption pursuant to 
this paragraph will be made upon not less than 30 days nor more than 60 days 
notice to the Holder of the Debentures, at 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 

                                       7

<PAGE>

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.

SECTION 3.3.   NO SINKING FUND.

     The Debentures are not entitled to the benefit of any sinking fund.

                                      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 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.

                                       8

<PAGE>

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.

          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 or (ii) 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).

                                       9

<PAGE>

                                      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 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.

                                       10

<PAGE>

                                      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.

                                     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 FACE 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.

                                       11

<PAGE>

          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

                   ___% DEFERRABLE INTEREST SUBORDINATED DEBENTURE
                                     DUE _______

          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 
______________ or registered assigns, the principal sum of _____________ 
Dollars ($___________) on _________, ____, and to pay interest on said 
principal sum from ____________, 199__, 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 ___% 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 Trustee 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. 


                                       13

<PAGE>

Notwithstanding the 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.

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

                                       14

<PAGE>

          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:


                       (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

                                       15

<PAGE>

                            (FORM OF REVERSE OF DEBENTURE)

          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 ________________, 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 
_______, 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 ______________, ______.  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 ___________, ____   (an "Optional Redemption"), at a redemption 
price equal to 100% of the principal amount plus any accrued but unpaid 
interest, including any Compounded Interest and Additional Interest, if any, 
to the date of such redemption (the "Optional Redemption Price").  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 or 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 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.

                                       16

<PAGE>

          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. 

          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 

                                       17

<PAGE>

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 
dividends on, make 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 of the 
Company's capital stock for another class or series of the Company's capital 
stock or (ii) 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 

                                       18

<PAGE>

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 ___________ and State of ____________  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 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 $25 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.

                                       19

<PAGE>

                                      ARTICLE IX
                             ORIGINAL ISSUE OF DEBENTURES

SECTION 9.1.   ORIGINAL ISSUE OF DEBENTURES.

          Debentures in the aggregate principal amount of $___________ 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 Vice 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.

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.


                                       20

<PAGE>

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.]

                                       21

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

Attest:

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

                                       THE BANK OF NEW YORK
                                       as Trustee

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

Attest:

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


                                       22


<PAGE>






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

                                Guarantee Agreement

                                       between

                          PUBLIC SERVICE COMPANY OF COLORADO
                                    (as Guarantor)

                                         and

                                 The Bank of New York
                           (as Preferred Guarantee Trustee)




                                     Dated as of

                                   __________, 1998


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

<PAGE>
                                  TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                 Page
                                                                                 ----
<S>                                                                              <C>
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

</TABLE>

                                       -ii-

<PAGE>

                                CROSS-REFERENCE TABLE*
<TABLE>
<CAPTION>

Section of                                                       Section of  
Trust Indenture Act                                              Guarantee of
1939, as amended                                                 Agreement   
- -------------------                                              ------------
<S>                                                              <C>
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)
</TABLE>
- --------------------------------

*    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 __________, 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 __________, 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 $___________ aggregate liquidation amount of its ___% Trust Originated 
Preferred Securities (liquidation amount of $[     ] 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 
$[      ] 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 _________, 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.

     "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 by this Preferred Securities Guarantee or by law, except 
that an Indemnified Person shall be liable 

                                       -13-


<PAGE>

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 Eight of the 
Indenture.  In connection with a consolidation, merger or sale involving the 

                                       -14-

<PAGE>

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

                                       THE BANK OF NEW YORK,
                                        as Preferred Guarantee Trustee

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


                                       -17-



<PAGE>


                                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. ss. 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:  /s/ Walter N. Gitlin 
                              -----------------------------------
                              Name:     Walter N. Gitlin
                              Title:    Vice President

                         The Bank of New York, Delaware, as Trustee


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


                         /s/ Nancy Felker   
                         ----------------------------------------
                         Nancy Felker, as Trustee


<PAGE>


                                DECLARATION OF TRUST
                                          
                                          
          This DECLARATION OF TRUST, dated as of February 27, 1998 (this
"Declaration"), among Public Service Company of Colorado, a Colorado
corporation, as "Depositor," and The Bank of New York, a New York banking
corporation, The Bank of New York (Delaware), a Delaware banking corporation,
and Nancy Felker, not in their individual capacities but solely as trustees (the
"Trustees"). The Depositor and the Trustees hereby agree as follows: 

          1. The trust created hereby shall be known as "PSCO Capital Trust I,"
in which name the Trustees, or the Depositor to the extent provided herein, may
conduct the business of the Trust, make and execute contracts, and sue and be
sued.

          2. The Depositor hereby assigns, transfers, conveys and sets over to
the Trustees the sum of $10. The Trustees hereby acknowledge receipt of such
amount in trust from the Depositor, which amount shall constitute the initial
trust estate. The Trustees hereby declare that they will hold the trust estate
in trust for the Depositor. It is the intention of the parties hereto that the
Trust created hereby constitute a business trust under Chapter 38 of Title 12 of
the Delaware Code, 12 DEL. C. ss. 3801, et seq. (the "Business Trust Act"), and
that this document constitutes the governing instrument of the Trust. The
Trustees are hereby authorized and directed to execute and file a certificate of
trust with the Delaware Secretary of State in accordance with the provisions of
the Business Trust Act.

          3. The Depositor and the Trustees will enter into an amended and
restated Declaration of Trust, satisfactory to each such party and substantially
in the form included as an exhibit to the 1933 Act Registration Statement (as
defined below), to provide for the contemplated operation of the Trust created
hereby and the issuance of the Preferred Securities and Common Securities
referred to therein.  Prior to the execution and delivery of such amended and
restated Declaration of Trust, the Trustees shall not have any duty or
obligation hereunder or with respect to the trust estate, except as otherwise
required by applicable law or as may be necessary to obtain prior to such
execution and delivery of any licenses, consents or approvals required by
applicable law or otherwise.

          4. The Depositor and the Trustees hereby authorize and direct the
Depositor, as the sponsor of the Trust, (i) to file with the Securities and
Exchange Commission (the "Commission") and execute, in each case on behalf of
the Trust, (a) the Registration Statement on Form S-3 (the "1933 Act
Registration Statement"), including any pre-effective or post-effective
amendments to the 1933 Act Registration Statement (including the prospectus,
prospectus supplements and the exhibits contained therein), relating to the
registration under the Securities Act of 1933, as amended, of the Preferred
Securities of the Trust and possibly certain other 

<PAGE>

securities and (b) a Registration Statement on Form 8-A (the "1934 Act 
Registration Statement") (including all pre-effective and post-effective 
amendments thereto) relating to the registration of the Preferred Securities 
of the Trust under Section 12(b) or 12(g) of the Securities Exchange Act of 
1934, as amended, including any amendments thereto; (ii) to file with the New 
York Stock Exchange or any other national stock exchange or The Nasdaq 
National Market (each, an "Exchange") and execute on behalf of the Trust one 
or more listing applications and all other applications, statements, 
certificates, agreements and other instruments as shall be necessary or 
desirable to cause the Preferred Securities to be listed on any of the 
Exchanges; (iii) to file and execute on behalf of the Trust such 
applications, reports, surety bonds, irrevocable consents, appointments of 
attorney for service of process and other papers and documents as shall be 
necessary or desirable to register the Preferred Securities under the 
securities or blue sky laws of such jurisdictions as the Depositor, on behalf 
of the Trust, may deem necessary or desirable and (iv) to negotiate the terms 
of and to execute, deliver and perform on behalf of the Trust that certain 
Underwriting Agreement relating to the Preferred Securities, including the 
Pricing Agreement attached as an exhibit thereto, if any, in each case among 
the Trust, the Depositor and the several Underwriters named therein, 
substantially in the form included as an exhibit to the 1933 Act Registration 
Statement. In the event that any filing referred to in clauses (i), (ii) and 
(iii) above is required by the rules and regulations of the Commission, an 
Exchange or state securities or blue sky laws, to be executed on behalf of 
the Trust by any of the Trustees, Nancy Felker, in her capacity as a Trustee 
of the Trust, is hereby authorized and directed to join in any such filing 
and to execute on behalf of the Trust any and all of the foregoing. In 
connection with all of the foregoing, the Depositor hereby constitutes and 
appoints James D. Steinhilper as its true and lawful attorney-in-fact and 
agent, with full power of substitution and resubstitution, for the Depositor 
or in the Depositor's name, place and stead, in any and all capacities, to 
sign any and all amendments (including post-effective amendments) to the 1933 
Act Registration Statement and the 1934 Act Registration Statement and to 
file the same, with all exhibits thereto, and other documents in connection 
therewith, with the Commission, granting unto said attorney-in-fact and agent 
full power and authority to do and perform each and every act and thing 
requisite and necessary to be done in connection therewith, as fully to all 
intents and purposes as the Depositor might or could do in person, hereby 
ratifying and confirming all that said attorney-in-fact and agent or his 
substitute or substitutes, shall do or cause to be done by virtue hereof. 

          5. This Declaration may be executed in one or more counterparts.

          6. The number of Trustees initially shall be three (3) and thereafter
the number of Trustees shall be such number as shall be fixed from time to time
by a written instrument signed by the Depositor which may increase or decrease
the number of Trustees; provided, however, that to the extent required by the
Business Trust Act, one Trustee shall either be 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 and otherwise meets
the requirements of applicable Delaware law. Subject to the foregoing, the
Depositor is entitled to appoint or remove without cause any Trustee at any
time.  Any Trustee may resign upon thirty (30) days' prior notice to the
Depositor.

                                     -2-
<PAGE>

          7. This Declaration shall be governed by, and construed in accordance
with, the laws of the State of Delaware (without regard to conflict of laws of
principles).

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

                         PUBLIC SERVICE COMPANY OF 
                         COLORADO, as Depositor 


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

                         THE BANK OF NEW YORK, not in its individual capacity
                         but solely as Trustee

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

                         THE BANK OF NEW YORK (DELAWARE), not in its 
                         individual capacity but solely as Trustee

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

                         /s/ Nancy Felker 
                         ----------------------------------------------------
                         Nancy Felker, not in her individual capacity but 
                         solely as Trustee


                                     -3-

<PAGE>




                                          
                                          
                            Form of 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 _______, 1998 
                                          
                                           
<PAGE>


                                  TABLE OF CONTENTS
<TABLE>
                                                                                 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
     Section 2.04.  Issuance of the Trust Securities . . . . . . . . . . . . . . . .9
     Section 2.05.  Purchase of Debentures . . . . . . . . . . . . . . . . . . . . 10
     Section 2.06.  Declaration. . . . . . . . . . . . . . . . . . . . . . . . . . 10
     Section 2.07.  Authorization to Enter into Certain Transactions . . . . . . . 10
     Section 2.08.  Assets of Trust. . . . . . . . . . . . . . . . . . . . . . . . 14
     Section 2.09.  Title to Trust Property. . . . . . . . . . . . . . . . . . . . 14

ARTICLE III  Payment Account . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     Section 3.01.  Payment Account. . . . . . . . . . . . . . . . . . . . . . . . 15

ARTICLE IV  Distributions; Redemption. . . . . . . . . . . . . . . . . . . . . . . 15
     Section 4.01.  Distributions. . . . . . . . . . . . . . . . . . . . . . . . . 15
     Section 4.02.  Redemption . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     Section 4.03.  Subordination of Common Securities . . . . . . . . . . . . . . 18
     Section 4.04.  Payment Procedures . . . . . . . . . . . . . . . . . . . . . . 18
     Section 4.05.  Tax Returns and Reports. . . . . . . . . . . . . . . . . . . . 19
     Section 4.06.  Payments under Indenture . . . . . . . . . . . . . . . . . . . 19

ARTICLE V  Trust Securities Certificates . . . . . . . . . . . . . . . . . . . . . 19
     Section 5.01.  Initial Ownership. . . . . . . . . . . . . . . . . . . . . . . 19
     Section 5.02.  The Trust Securities Certificates. . . . . . . . . . . . . . . 19
     Section 5.03.  Delivery of Trust Securities Certificates. . . . . . . . . . . 20
     Section 5.04.  Registration of Transfer and Exchange of Preferred Securities
                      Certificates . . . . . . . . . . . . . . . . . . . . . . . . 20
     Section 5.05.  Mutilated, Destroyed, Lost or Stolen Trust Securities
                      Certificates . . . . . . . . . . . . . . . . . . . . . . . . 20
     Section 5.06.  Persons Deemed Securityholders . . . . . . . . . . . . . . . . 21
     Section 5.07.  Access to List of Securityholders' Names and Addresses . . . . 21
     Section 5.08.  Maintenance of Office or Agency. . . . . . . . . . . . . . . . 21
     Section 5.09.  Appointment of Paying Agent. . . . . . . . . . . . . . . . . . 22
     Section 5.10.  Transfer of Securities . . . . . . . . . . . . . . . . . . . . 22
     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. . . . . . . . . . . . . . . . . . . 23

                                             -i-
<PAGE>
                                                                                 Page
                                                                                 ----
ARTICLE VI  Acts of Securityholders; Meetings; Voting. . . . . . . . . . . . . . . 24
     Section 6.01.  Limitations on Voting Rights . . . . . . . . . . . . . . . . . 24
     Section 6.02.  Notice of Meetings . . . . . . . . . . . . . . . . . . . . . . 24
     Section 6.03.  Meetings of Preferred Securityholders. . . . . . . . . . . . . 25
     Section 6.04.  Voting Rights. . . . . . . . . . . . . . . . . . . . . . . . . 25
     Section 6.05.  Proxies, etc . . . . . . . . . . . . . . . . . . . . . . . . . 25
     Section 6.06.  Securityholder Action by Written Consent . . . . . . . . . . . 25
     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 . . . . . . . . . . . . . . 28
     Section 7.04.  Not Responsible for Recitals or Issuance of Securities . . . . 29
     Section 7.05.  May Hold Securities. . . . . . . . . . . . . . . . . . . . . . 29
     Section 7.06.  Compensation; Indemnity; Fees. . . . . . . . . . . . . . . . . 29
     Section 7.07.  Corporate Property Trustee Required; Eligibility of Trustees . 32
     Section 7.08.  Conflicting Interests. . . . . . . . . . . . . . . . . . . . . 32
     Section 7.09.  Co-Trustees and Separate Trustee . . . . . . . . . . . . . . . 32
     Section 7.10.  Resignation and Removal; Appointment of Successor. . . . . . . 34
     Section 7.11.  Acceptance of Appointment by Successor . . . . . . . . . . . . 35
     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. . . . . . . . . . . . . . . . . . 36
     Section 7.15.  Reports to the Property Trustee. . . . . . . . . . . . . . . . 36
     Section 7.16.  Evidence of Compliance with Conditions Precedent . . . . . . . 36
     Section 7.17.  Statements Required in Officers' Certificate and Opinion of
                      Counsel. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
     Section 7.18.  Number of Trustees . . . . . . . . . . . . . . . . . . . . . . 37
     Section 7.19.  Delegation of Power. . . . . . . . . . . . . . . . . . . . . . 38
     Section 7.20.  Voting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

ARTICLE VIII  Dissolution and Liquidation. . . . . . . . . . . . . . . . . . . . . 38
     Section 8.01.  Dissolution Upon Expiration Date . . . . . . . . . . . . . . . 38
     Section 8.02.  Early Dissolution. . . . . . . . . . . . . . . . . . . . . . . 38
     Section 8.03.  Dissolution. . . . . . . . . . . . . . . . . . . . . . . . . . 39
     Section 8.04.  Liquidation. . . . . . . . . . . . . . . . . . . . . . . . . . 39

ARTICLE IX  Mergers, Etc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
     Section 9.01.  Mergers, Consolidations, Amalgamations or Replacements
                      of the Trust . . . . . . . . . . . . . . . . . . . . . . . . 40

                                             -ii-
<PAGE>

                                                                                 Page
                                                                                 ----
ARTICLE X  Miscellaneous Provisions. . . . . . . . . . . . . . . . . . . . . . . . 41
     Section 10.01.  Limitation of Rights of Securityholders . . . . . . . . . . . 41
     Section 10.02.  Amendment . . . . . . . . . . . . . . . . . . . . . . . . . . 41
     Section 10.03.  Severability. . . . . . . . . . . . . . . . . . . . . . . . . 42
     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. . . . . . . . . . . . . . . 43
     Section 10.08.  Successors and Assigns. . . . . . . . . . . . . . . . . . . . 43
     Section 10.09.  Headings. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
     Section 10.10.  Reports, Notices and Demands. . . . . . . . . . . . . . . . . 43
     Section 10.11.  Agreement Not to Petition . . . . . . . . . . . . . . . . . . 44
     Section 10.12.  Trust Indenture Act; Conflict with Trust Indenture Act. . . . 44
     Section 10.13.  Acceptance of Terms of Declaration, Guarantee and Indenture . 45

ARTICLE XI  Representations of Property Trustee and Delaware Trustee . . . . . . . 45
     Section 11.01.  Representations and Warranties of Property Trustee. . . . . . 45
     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

Trust Indenture                                        Declaration of Trust
  Act Section                                                Section
  -----------                                                -------
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>

Trust Indenture                                        Declaration of Trust
  Act Section                                                Section
  -----------                                                -------
Sections 317 (a)(1). . . . . . . . . . . . . . . . . . . .  Not Applicable 
             (a)(2). . . . . . . . . . . . . . . . . . . .  Not Applicable 
             (b) . . . . . . . . . . . . . . . . . . . . . . . . . .  5.09 
Sections 318 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . 10.10 

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

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 ___________, 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 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 a day other than (a) a Saturday or Sunday, or (b) a 
day on which banking institutions in The City of New York or the State of 
Colorado are required by law or executive order to remain closed.

     "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 _____% Deferrable Interest 
Subordinated Debentures due ____________ 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 ___________, 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 __% Trust Originated 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 the pricing agreement dated 
__________________, 1998 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.

                                       -7-
<PAGE>

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

     "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 
_____________, 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.

                                       -8-
<PAGE>

     (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 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.  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 _________ Preferred Securities having an aggregate Liquidation 
Amount of $___________, against receipt by the Property Trustee of the 
aggregate purchase price of such Preferred Securities of $___________, 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 

                                      -9-
<PAGE>

Common Securities Certificate, registered in the name of the Depositor, 
representing _______ Common Securities having an aggregate Liquidation Amount 
of $_________, and in satisfaction of the purchase price of such Common 
Securities the Depositor shall deliver to the Property Trustee the sum of 
$_________.

     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 $___________ 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 
$___________.

     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.

     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 

                                       -10-
<PAGE>

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;

               (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;

                                             -11-
<PAGE>

               (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;

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

                                              -12-
<PAGE>

               (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.

     (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):

                                     -13-
<PAGE>

          (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 the 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 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.

                                           -14-
<PAGE>

     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 _____________, 
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 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").

                                        -15-
<PAGE>

     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 _____% 
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) 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:

          (i)   the Redemption Date;

          (ii)  the Redemption Price;

                                         -16-
<PAGE>

          (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 Preferred 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 Preferred 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 Preferred Securities upon surrender of their 
Preferred 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 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.

                                        -17-
<PAGE>

     (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 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 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 

                                      -18-
<PAGE>

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 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 

                                      -19-
<PAGE>

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 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 

                                     -20-
<PAGE>

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.

     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 

                                      -21-
<PAGE>

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:

          (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.

                                           -22-
<PAGE>

     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 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.

                                      -23-
<PAGE>

                                      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.

     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 

                                        -24-
<PAGE>

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 ________ __, 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:
                                   ---------------------------------------
                                   Name:
                                   Title:

                              THE BANK OF NEW YORK
                              Property Trustee

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

                              THE BANK OF NEW YORK (DELAWARE)
                              as Delaware Trustee 

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

                              NANCY FELKER,
                              as Administrative Trustee 

                              --------------------------------------------
                                   
                                   
                                          -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
                                          
                                        B-1
                                          
                            Number of Common Securities 
                                      ------- 
                     Certificate Evidencing Common Securities 
                                         of
                                PSCO Capital Trust I
                                          
                              _____% 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
________________________ (_______) common securities of the Trust representing
undivided beneficial interests in the assets of the Trust and designated as the
_____% 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 ___________ ___, 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 ____ day of ________, 1998.

                              PSCO CAPITAL TRUST I

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

                                          B-1
<PAGE>

                                                                       EXHIBIT C
                                  Certificate Number

                                       --------


                                                  Number of Preferred Securities
                                                           CUSIP NO.  __________

                    Certificate Evidencing Preferred Securities 
                                         of
                                PSCO Capital Trust I
                                          
                   _____% Trust Originated Preferred Securities 
                  (liquidation amount $25 per Preferred Security) 

     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 _________, _________________________ 
(_________) preferred securities of the Trust representing an undivided 
beneficial interest in the assets of the Trust and designated the PSCO 
Capital Trust I _____% 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 ____________, 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 __________ ___, 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 ___ 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 ____ day of ______________ 1998.

                         PSCO CAPITAL TRUST I 


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

                         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 _____% (the "Coupon Rate") of the stated liquidation amount of
$____ 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: 
                    -----------------------------

                                           C-4

<PAGE>

                LETTERHEAD OF LEBOEUF, LAMB, GREENE & MACRAE, L.L.P.



                                              March 6, 1998



Public Service Company of Colorado
1225 17th Street
Denver, Colorado 80202

Ladies and Gentlemen:

          We have acted as counsel for Public Service Company of Colorado, a
Colorado corporation (the "Company"), and PSCO Capital Trust I, a statutory
business trust created under the Business Trust Act of the State of Delaware
(the "Trust"), in connection with the preparation and filing with the Securities
and Exchange Commission (the "Commission") under the Securities Act of 1933, as
amended (the "Securities Act"), of a Registration Statement on Form S-3 (the
"Registration Statement"), relating to the following securities of the Company:
(i) first collateral trust bonds (the "Bonds"); (ii) unsecured senior debt
securities (the "Senior Debt Securities"); and (iii) unsecured subordinated debt
securities (the "Subordinated Debt Securities", and together with the Bonds and
the Senior Debt Securities, the "Debt Securities").  The Registration Statement
also relates to the preferred securities of the Trust (the "Preferred
Securities") and the guarantee of the Preferred Securities by the Company to the
extent described in the Prospectus forming a part of the Registration Statement
(the "Guarantee", and together with the Debt Securities and the Preferred
Securities, the "Offered Securities").  The Offered Securities will be issued
from time to time pursuant to the provisions of Rule 415 under the Securities
Act.

          The Preferred Securities will be issued pursuant to an Amended and
Restated Declaration of Trust, the form of which is filed as an exhibit to the
Registration Statement.  The Bonds will be issued in one or more series under an
Indenture dated as of October 1, 1993 the ("Bond Indenture"), between the
Company and First Trust of New York, National Association, as successor trustee
thereunder (the "Bond Trustee").  The Senior Debt Securities will be issued in
one or more series pursuant to an Indenture (the "Senior Indenture") between the
Company and The Bank of New York, as trustee (the "Senior Trustee"), the form of
which 

<PAGE>

March 6, 1998
Page 2


is filed as an exhibit to the Registration Statement.  The Subordinated Debt 
Securities will be issued in one or more series pursuant to an Indenture (the 
"Subordinated Indenture") between the Company and The Bank of New York, as 
trustee (the "Subordinated Trustee"), the form of which is filed as an exhibit 
to the Registration Statement.  The Guarantee of the Preferred Securities is 
to be issued pursuant to the Preferred Securities Guarantee Agreement (the 
"Preferred Securities Guarantee") between the Company and The Bank of New York 
(the "Guarantee Trustee"), the form of which is filed as an exhibit to the 
Registration Statement.

          As such counsel, we have examined and relied upon a copy of the
Registration Statement.  We have also examined such corporate records,
certificates and other documents as we have considered necessary for the
purposes of this opinion.  In such examination, we have assumed the genuineness
of all signatures, the authenticity of all documents submitted to us as
originals, the conformity to the original documents of all documents submitted
to us as copies and the authenticity of the original of such latter documents. 
As to any facts material to our opinion, we have, when relevant facts were not
independently established, relied upon the aforesaid records, certificates and
documents.

          Based on the foregoing examination, and subject to the qualifications
and limitations contained herein, we are of the opinion that:

          1.   when (i) the Registration Statement, as finally amended
     (including any necessary post-effective amendments), shall have become
     effective under the Securities Act and the Senior Indenture and the
     Subordinated Indenture, including any necessary supplemental indentures,
     filed as exhibits to the Registration Statement shall have been duly
     qualified under the Trust Indenture Act of 1939, as amended (the "Trust
     Indenture Act"); (ii) all orders, consents or other authorizations of the
     Colorado Public Utilities Commission (the "CPUC") required for the valid
     issuance and sale of a particular series of Bonds, Senior Debt Securities
     or Subordinated Debt Securities, as applicable, have been obtained; and
     (iii) a prospectus supplement with respect to a particular series of Debt
     Securities shall have been filed with the Commission in compliance with the
     Securities Act and the rules and regulations thereunder, no further
     authorization, consent or approval by any regulatory authority will be
     required for the valid issuance and sale of the Debt Securities of such
     series.

          2.   when (i) the Senior Indenture and the Subordinated Indenture
     shall have been duly executed and delivered by the Company and the Senior
     Trustee and the Subordinated Trustee, respectively; and (ii) a Board
     Resolution or Officer's Certificate within the meaning of the Bond
     Indenture, Senior Indenture or Subordinated Indenture, as the case may be,
     shall have been issued or a supplemental indenture entered into, in

<PAGE>

March 6, 1998
Page 3


     accordance with the Bond Indenture, Senior Indenture or Subordinated
     Indenture, as the case may be, detailing the establishment of a particular
     series of Debt Securities, such series of Debt Securities shall have been
     duly authorized by the Company.

          3.   upon the execution and filing with the Bond Trustee, the Senior
     Trustee and the Subordinated Trustee, as applicable, of the proper papers
     with respect to the Bonds, Senior Debt Securities or Subordinated Debt
     Securities, as applicable, of a particular series, the Debt Securities of
     such series shall be issuable under the terms of the Bond Indenture, Senior
     Indenture or Subordinated Indenture, as applicable.

          4.   when such series of Debt Securities shall have been duly
     executed, authenticated and delivered in accordance with the corporate and
     governmental authorizations and the instruments referred to above and the
     purchase price for such series of Debt Securities has been received by the
     Company, the Debt Securities of such series will be legally issued and
     binding obligations of the Company and will be entitled to the benefits of
     the Bond Indenture, Senior Indenture or Subordinated Indenture, as
     applicable, on a parity with the securities of other series which may be
     hereafter issued thereunder pursuant to the terms of such indenture (except
     as may be limited by applicable bankruptcy, insolvency, reorganization,
     moratorium, fraudulent transfer or other similar laws affecting the
     enforcement of creditors' rights generally and by the effect of general
     principles of equity, regardless of whether considered in a proceeding in
     equity or at law).

          5.   when (i) the Registration Statement, as finally amended
     (including any necessary post-effective amendments), shall have become
     effective under the Securities Act and the Preferred Securities Guarantee
     shall have been duly qualified under the Trust Indenture Act; (ii) all
     orders, consents or other authorizations of the CPUC required for the
     performance of the Preferred Securities Guarantee have been obtained; and
     (iii) a prospectus supplement with respect to the Preferred Securities
     Guarantee and the Preferred Securities shall have been filed with the
     Commission in compliance with the Securities Act and the rules and
     regulations thereunder, no further authorization, consent or approval by
     any regulatory authority will be required with respect to the performance
     by the Company of its obligations with respect to the Preferred Securities
     Guarantee.

          6.   when (i) the Preferred Securities Guarantee shall have been duly
     executed and delivered by the Company and the Guarantee Trustee; and (ii)
     the Preferred Securities have been duly issued and sold and the purchase
     price therefor has been received by the Trust in the manner contemplated by
     the Registration Statement, 

<PAGE>

March 6, 1998
Page 4


     the Preferred Securities Guarantee will constitute a valid and binding 
     obligation of the Company (except as may be limited by applicable 
     bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer or 
     other similar laws affecting the enforcement of creditors' rights generally
     and by the effect of general principles of equity, regardless of whether 
     considered in a proceeding in equity or at law).

          We do not find it necessary for the purposes of this opinion to cover,
and accordingly we express no opinion as to, the application of the securities
or blue sky laws of the several states to the sale of the securities to be
registered pursuant to the Registration Statement.  Without limiting the
generality of the foregoing, we express no opinion in connection with the
matters contemplated by the Registration Statement, and no opinion may be
implied or inferred, except as expressly set forth herein.

          Our opinion expressed above is limited to the laws of the State of New
York and the State of Colorado, and the federal laws of the United States of
America.

          We hereby consent to the filing of this opinion letter as an exhibit
to the Registration Statement and the use of our name under the headings
"Description of the New Bonds," "Description of the 1939 Mortgage" and "Validity
of the Securities" in the Prospectus forming a part of the Registration
Statement and in any amendments or supplements to the Registration Statement and
Prospectus.


                                   Very truly yours,

                                   /s/ LeBoeuf, Lamb, Greene & MacRae
                                                  L.L.P.


<PAGE>





                                 March 6, 1998



PSCO Capital Trust I 
c/o Public Service Company of Colorado
1225 17th Street
Denver, Colorado 80202-5533 


          Re:  PSCO Capital Trust I
                                         
Ladies and Gentlemen:

          We have acted as special Delaware counsel for Public Service 
Company of Colorado, a Colorado corporation (the "Company"), and PSCO Capital 
Trust I, a Delaware business trust (the "Trust"), in connection with the 
matters set forth herein.  At your request, this opinion is being furnished 
to you.

          For purposes of giving the opinions hereinafter set forth, our 
examination of documents has been limited to the examination of originals or 
copies of the following:

          (a)  The Certificate of Trust of the Trust, dated February 27, 
1998, as filed with the office of the Secretary of State of the State of 
Delaware (the "Secretary of State") on February 27, 1998;

          (b)  The Declaration of Trust of the Trust, dated as of February 
27, 1998,  between the Company and the trustees of the Trust named therein;

          (c)  The Registration Statement (the "Registration Statement") on 
Form S-3, including a preliminary prospectus with respect to the Trust (the 
"Prospectus"), relating to the Preferred Securities of the Trust representing 
preferred undivided beneficial interests in the assets of the Trust (each, a 
"Preferred Security" and collectively, the "Preferred Securities"), filed by 
the 

<PAGE>

PSCO Capital Trust I
March 6, 1998
Page 2


Company and the Trust with the Securities and Exchange Commission on or about 
March 6, 1998; 

          (d)  A form of Amended and Restated Declaration of Trust of the 
Trust, to be entered into between the Company, the trustees of the Trust 
named therein, and the holders, from time to time, of the undivided 
beneficial interests in the assets of such Trust (including the exhibits 
thereto) (the "Declaration"), attached as an exhibit to the Registration 
Statement; and

          (e)  A Certificate of Good Standing for the Trust, dated March 6, 
1998, obtained from the Secretary of State.

          Initially capitalized terms used herein and not otherwise defined 
are used as defined in the Declaration.

          For purposes of this opinion, we have not reviewed any documents 
other than the documents listed in paragraphs (a) through (e) above.  In 
particular, we have not reviewed any document (other than the documents 
listed in paragraphs (a) through (e) above) that is referred to in or 
incorporated by reference into the documents reviewed by us.  We have assumed 
that there exists no provision in any document that we have not reviewed that 
is inconsistent with the opinions stated herein.  We have conducted no 
independent factual investigation of our own but rather have relied solely 
upon the foregoing documents, the statements and information set forth 
therein and the additional matters recited or assumed herein, all of which we 
have assumed to be true, complete and accurate in all material respects.

          With respect to all documents examined by us, we have assumed (i) 
the authenticity of all documents submitted to us as authentic originals, 
(ii) the conformity with the originals of all documents submitted to us as 
copies or forms, and (iii) the genuineness of all signatures.

          For purposes of this opinion, we have assumed (i) that the 
Declaration constitutes the entire agreement among the parties thereto with 
respect to the subject matter thereof, including with respect to the 
creation, operation and termination of the Trust, and that the Declaration 
and the Certificate of Trust are in full force and effect and have not been 
amended, (ii) except to the extent provided in paragraph 1 below, the due 
organization or due formation, as the case may be, and valid existence in 
good standing of each party to the documents examined by us under the laws of 
the jurisdiction governing its organization or formation, (iii) the legal 
capacity of natural persons who are parties to the documents examined by us, 
(iv) that each of the parties to the documents examined by us has the power 
and authority to execute and deliver, and to perform its obligations under, 
such documents, (v) the due authorization, execution and delivery by all 
parties thereto of all documents examined by us, (vi) the receipt by each 
Person to 

<PAGE>

PSCO Capital Trust I
March 6, 1998
Page 3


whom a Preferred Security is to be issued by the Trust (collectively, the 
"Preferred Security Holders") of a Preferred Security Certificate for such 
Preferred Security and the payment for such Preferred Security, in accordance 
with the Declaration and the Registration Statement, and (vii) that the 
Preferred Securities are issued and sold to the Preferred Security Holders in 
accordance with the Declaration and the Registration Statement.  We have not 
participated in the preparation of the Registration Statement and assume no 
responsibility for its contents.

          This opinion is limited to the laws of the State of Delaware 
(excluding the securities laws of the State of Delaware), and we have not 
considered and express no opinion on the laws of any other jurisdiction, 
including federal laws and rules and regulations relating thereto.  Our 
opinions are rendered only with respect to Delaware laws and rules, 
regulations and orders thereunder which are currently in effect.

          Based upon the foregoing, and upon our examination of such 
questions of law and statutes of the State of Delaware as we have considered 
necessary or appropriate, and subject to the assumptions, qualifications, 
limitations and exceptions set forth herein, we are of the opinion that:

          1.   The Trust has been duly created and is validly existing in 
good standing as a business trust under the Delaware Business Trust Act.

          2.   The Preferred Securities will represent valid and, subject to 
the qualifications set forth in paragraph 3 below, fully paid and 
nonassessable undivided beneficial interests in the assets of the Trust.  

          3.   The Preferred Security Holders, as beneficial owners of the 
Trust, will 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.  We note that the Preferred 
Security Holders may be obligated to make payments as set forth in the 
Declaration.

          We consent to the filing of this opinion with the Securities and 
Exchange Commission as an exhibit to the Registration Statement.  We hereby 
consent to the use of our name under the heading "Validity of the Securities" 
in the Prospectus.  In giving the foregoing consent, we do not thereby admit 
that we come within the category of persons whose consent is required under 
Section 7 of the Securities Act of 1933, as amended, or the rules and 
regulations of the Securities and Exchange Commission thereunder.  Except as 
stated above, without our prior written consent, this opinion may not be 
furnished or quoted to, or relied upon by, any other person for any purpose.

<PAGE>

PSCO Capital Trust I
March 6, 1998
Page 4


                              Very truly yours,

                              /s/ Richards, Layton & Finger, P.A.

CDK


<PAGE>




                         PUBLIC SERVICE COMPANY OF COLORADO
                                  AND SUBSIDIARIES

                   COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
                           TO CONSOLIDATED FIXED CHARGES


<TABLE>
                                                            Year Ended December 31,                
                                            ------------------------------------------------------ 
                                              1997        1996        1995       1994       1993   
                                            --------    --------    --------   --------   -------- 
                                                     (Thousands of Dollars, except ratios)
<S>                                         <C>         <C>         <C>        <C>        <C>       
Fixed charges:
Interest on long-term debt                  $114,460    $ 92,205    $ 85,832   $ 89,005   $ 98,089  
Interest on borrowings against 
    COLI contracts                            46,082      40,160      34,717     29,786     25,333  
Other interest                                24,117      17,238      23,392     14,235      9,445  
Amortization of debt discount and 
    expense less premium                       3,987       3,621       3,278      3,126      2,018  
Interest component of rental expense           9,012      10,649       6,729      6,888      6,824  
                                            --------    --------    --------   --------   -------- 
  Total                                     $197,658    $163,873    $153,948   $143,040   $141,709  
                                            --------    --------    --------   --------   -------- 
                                            --------    --------    --------   --------   -------- 
Earnings (before fixed charges and
taxes on income):
  Net income                                $204,042    $190,346    $178,856   $170,269   $157,360   
  Fixed charges as above                     197,658    $163,873    $153,948   $143,04    $141,709   
  Provisions for Federal and state
     taxes on income, net of investment 
     tax credit amortization                  90,813      96,331      95,357     48,500     60,994  
                                            --------    --------    --------   --------   -------- 
  Total                                     $492,513    $450,550    $428,161   $361,809   $360,063   
                                            --------    --------    --------   --------   -------- 
                                            --------    --------    --------   --------   -------- 
Ratio of earnings to fixed charges              2.49        2.75        2.78       2.53       2.54   
                                            --------    --------    --------   --------   -------- 
                                            --------    --------    --------   --------   -------- 
</TABLE>


                                                

<PAGE>

                                                                  EXHIBIT 23(a)


                     CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
                                          
     As independent public accountants, we hereby consent to the incorporation
by reference in this Registration Statement of our report dated February 13,
1998, included in the Public Service Company of Colorado Form 10-K for the year
ended December 31, 1997, included in the New Century Energies, Inc. combined
Annual Report on Form 10-K for the year ended December 31, 1997, and to all
references to our Firm included in this Registration Statement.


                                    /s/ ARTHUR ANDERSEN LLP


Denver, Colorado,
March 6, 1998


<PAGE>
                                       
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D. C. 20549
                                       
                             ---------------------
                                       
                                  FORM T - 1
                                       
                   STATEMENT OF ELIGIBILITY UNDER THE TRUST
                    INDENTURE ACT OF 1939 OF A CORPORATION
                         DESIGNATED TO ACT AS TRUSTEE
                                       
                             ---------------------
                                       
               CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY
               OF A TRUSTEE PURSUANT TO SECTION 305(b)(2)       
                                                         ---------
                                       
                FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION
             (Exact name of trustee as specified in its charter)
                                       
                                  13-3781471
                              (I. R. S. Employer
                             Identification No.)

          100 Wall Street, New York, NY                             10005
     (Address of principal executive offices)                    (Zip Code)
                                       
                             ---------------------
                                       
                           FOR INFORMATION, CONTACT:
                          Dennis Calabrese, President
                 First Trust of New York, National Association
                          100 Wall Street, 16th Floor
                              New York, NY  10005
                           Telephone:  (212) 361-2506
                                       
                             ---------------------
                                       
                      PUBLIC SERVICE COMPANY OF COLORADO
              (Exact name of obligor as specified in its charter)
                                       
     Colorado                                           84-0296600   
     (State or other jurisdiction of                    (I. R. S. Employer
     incorporation or organization)                     Identification No.)

     1225 17th Street                                   80202
     Denver, Colorado
     (Address of principal executive offices)           (Zip Code)
                                       
                             ---------------------
                                       
                       FIRST COLLATERAL TRUST SECURITIES

<PAGE>

Item 1.   GENERAL INFORMATION.

     Furnish the following information as to the trustee --

     (a)  Name and address of each examining or supervising authority to which
          it is subject.

                          Name                           Address
                          ----                           -------
               Comptroller of the Currency          Washington, D.C.

     (b)  Whether it is authorized to exercise corporate trust powers.
     
          Yes.

Item 2.   AFFILIATIONS WITH THE OBLIGOR.
     
     If the obligor is an affiliate of the trustee, describe each such 
affiliation.

          None.

Item 16.  LIST OF EXHIBITS.

     Exhibit 1.  Articles of Association of First Trust of New York, National 
                 Association, incorporated herein by reference to Exhibit 1 of 
                 Form T-1, Registration No. 33-83774. 

     Exhibit 2.  Certificate of Authority to Commence Business for First 
                 Trust of New York, National Association, incorporated 
                 herein by reference to Exhibit 2 of Form T-1, Registration 
                 No. 33-83774.

     Exhibit 3.  Authorization of the Trustee to exercise corporate trust
                 powers for First Trust of New York, National Association, 
                 incorporated herein by reference to Exhibit 3 of Form T-1, 
                 Registration No. 33-83774.

     Exhibit 4.  By-Laws of First Trust of New York, National Association, 
                 incorporated herein by reference to Exhibit 4 of Form T-1,
                 Registration No. 333-34113.

     Exhibit 5.  Not applicable.

     Exhibit 6.  Consent of First Trust of New York, National Association, 
                 required by Section 321(b) of the Act, incorporated herein by
                 reference to Exhibit 6 of Form T-1, Registration No. 33-83774.

     Exhibit 7.  Report of Condition of First Trust of New York, National 
                 Association, as of the close of business on December 31, 1997,
                 published pursuant to law or the requirements of its 
                 supervising or examining authority.

<PAGE>

     Exhibit 8.  Not applicable.

     Exhibit 9.  Not applicable.


                                   SIGNATURE


     Pursuant to the requirements of the Trust Indenture Act of 1939, as 
amended, the trustee, First Trust of New York, National Association, a 
national banking association organized and existing under the laws of the 
United States, has duly caused this statement of eligibility to be signed on 
its behalf by the undersigned, thereunto duly authorized, all in The City of 
New York, and State of New York, on the 4th day of March, 1998.

                                       FIRST TRUST OF NEW YORK,
                                         NATIONAL ASSOCIATION



                                       By: /s/ Catherine F. Donohue
                                           ------------------------
                                           Catherine F. Donohue
                                           Vice President

<PAGE>
                                                                      Exhibit 7

                   FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION
                          STATEMENT OF FINANCIAL CONDITION
                                   AS OF 12/31/97

                                      ($000'S)
<TABLE>
<CAPTION>

                                                           12/31/97
                                                           --------
<S>                                                        <C>
ASSETS
     Cash and Due From Depository Institutions              $37,537
     Federal Reserve Stock                                    3,439
     Fixed Assets                                               698
     Intangible Assets                                       74,459
     Other Assets                                             6,072
                                                           --------
       TOTAL ASSETS                                        $122,205

LIABILITIES
     Other Liabilities                                        8,020
                                                           --------
     TOTAL LIABILITIES                                        8,020

EQUITY
     Common and Preferred Stock                               1,000
     Surplus                                                120,932
     Undivided Profits                                       (7,747)
                                                           --------
       TOTAL EQUITY CAPITAL                                 114,185

TOTAL LIABILITIES AND EQUITY CAPITAL                       $122,205
</TABLE>

To the best of the undersigned's determination, as of this date the above 
financial information is true and correct.

First Trust of New York, National Association

By: /s/ Catherine F. Donohue
   ------------------------------------------
    Vice President

Date: March 4, 1998


<PAGE>

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


                                       FORM T-1

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                               STATEMENT OF ELIGIBILITY
                      UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                       CORPORATION DESIGNATED TO ACT AS TRUSTEE

                         CHECK IF AN APPLICATION TO DETERMINE
                         ELIGIBILITY OF A TRUSTEE PURSUANT TO
                           SECTION 305(b)(2)           |__|

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

                                 THE BANK OF NEW YORK
                 (Exact name of trustee as specified in its charter)


New York                                            13-5160382
(State of incorporation                             (I.R.S. employer
if not a U.S. national bank)                        identification no.)

48 Wall Street, New York, N.Y.                      10286
(Address of principal executive offices)            (Zip code)

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

                          PUBLIC SERVICE COMPANY OF COLORADO
                 (Exact name of obligor as specified in its charter)


Colorado                                            84-0296600
(State or other jurisdiction of                     (I.R.S. employer
incorporation or organization)                      identification no.)

1225 17th Street
Denver, Colorado                                    80202
(Address of principal executive offices)            (Zip code)

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

                                Senior Debt Securities
                         (Title of the indenture securities)


===============================================================================
<PAGE>

1.   GENERAL INFORMATION.  FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a)  NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH
          IT IS SUBJECT.
          
- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the State of     2 Rector Street, New York, N.Y.
     New York                                    10006, and Albany, N.Y. 12203

     Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                 N.Y. 10045

     Federal Deposit Insurance Corporation       Washington, D.C. 20429

     New York Clearing House Association         New York, New York 10005

     (b)  WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2.   AFFILIATIONS WITH OBLIGOR.
     
     IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH SUCH
     AFFILIATION. 

     None.

16.  LIST OF EXHIBITS. 

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION, ARE
     INCORPORATED HEREIN BY REFERENCE AS AN EXHIBIT HERETO, PURSUANT TO RULE
     7A-29 UNDER THE TRUST INDENTURE ACT OF 1939 (THE "ACT") AND 17 C.F.R.
     229.10(d).

     1.   A copy of the Organization Certificate of The Bank of New York
          (formerly Irving Trust Company) as now in effect, which contains the
          authority to commence business and a grant of powers to exercise
          corporate trust powers.  (Exhibit 1 to Amendment No. 1 to Form T-1
          filed with Registration Statement No. 33-6215, Exhibits 1a and 1b to
          Form T-1 filed with Registration Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

                                      -2-
<PAGE>

     6.   The consent of the Trustee required by Section 321(b) of the Act. 
          (Exhibit 6 to Form T-1 filed with Registration Statement No.
          33-44051.)

     7.   A copy of the latest report of condition of the Trustee published
          pursuant to law or to the requirements of its supervising or examining
          authority.



                                        -3-
<PAGE>

                                      SIGNATURE

     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation organized and existing under the laws of the State of New York,
has duly caused this statement of eligibility to be signed on its behalf by the
undersigned, thereunto duly authorized, all in The City of New York, and State
of New York, on the 4th day of March, 1998.


                                     THE BANK OF NEW YORK



                                     By:  /s/ James W.P. Hall   
                                          ----------------------------------
                                          Name:  James W.P. Hall
                                          Title: Vice President
<PAGE>

                                                 EXHIBIT 7
- ----------------------------------------------------------

         Consolidated Report of Condition of
                THE BANK OF NEW YORK
       of 48 Wall Street, New York, N.Y. 10286

   And Foreign and Domestic Subsidiaries, a member of 
the Federal Reserve System, at the close of business 
September 30, 1997, published in accordance with a call 
made by the Federal Reserve Bank of this District pursuant 
to the provisions of the Federal Reserve Act.

<TABLE>
                                       Dollar Amounts
ASSETS                                  in Thousands
<S>                                     <C>
Cash and balances due from depos-
 itory institutions:
  Noninterest-bearing balances and
   currency and coin .................  $ 5,004,638
  Interest-bearing balances ..........    1,271,514
Securities:
  Held-to-maturity securities ........    1,105,782
  Available-for-sale securities ......    3,164,271
Federal funds sold and Securities pur-
 chased under agreements to resell....    5,723,829
Loans and lease financing
 receivables:
  Loans and leases, net of unearned
   income.............................   34,916,196
  LESS: Allowance for loan and
   lease losses.......................      581,177
  LESS: Allocated transfer risk
   reserve............................          429
  Loans and leases, net of unearned
   income, allowance, and reserve.....   34,334,590
Assets held in trading accounts ......    2,035,284
Premises and fixed assets (including
 capitalized leases)..................      671,664
Other real estate owned ..............       13,306
Investments in unconsolidated
 subsidiaries and associated
 companies............................      210,685
Customers' liability to this bank on
 acceptances outstanding..............    1,463,446
Intangible assets.....................      753,190
Other assets..........................    1,784,796
                                        -----------
Total assets..........................  $57,536,995
                                        -----------
                                        -----------
LIABILITIES
Deposits:
  In domestic offices.................  $27,270,824
  Noninterest-bearing.................   12,160,977
  Interest-bearing....................   15,109,847
  In foreign offices, Edge and
   Agreement subsidiaries, and IBFs...   14,687,806
  Noninterest-bearing.................      657,479
  Interest-bearing....................   14,030,327
Federal funds purchased and Securities
 sold under agreements to repurchase..    1,946,099
Demand notes issued to the U.S.
 Treasury.............................      283,793
Trading liabilities ..................    1,553,539
Other borrowed money:
  With remaining maturity of one year
   or less............................    2,245,014
  With remaining maturity of more than
   one year through three years.......            0
  With remaining maturity of more than
   three years........................       45,664
Bank's liability on acceptances exe-
 cuted and outstanding................    1,473,588
Subordinated notes and debentures.....    1,018,940
Other liabilities.....................    2,193,031
                                        -----------
Total liabilities.....................   52,718,298
                                        -----------
EQUITY CAPITAL
Common stock..........................    1,135,284
Surplus...............................      731,319
Undivided profits and capital
 reserves.............................    2,943,008
Net unrealized holding gains
 (losses) on available-for-sale
 securities...........................       25,428
Cumulative foreign currency transla-
 tion adjustments.....................      (16,342)
                                        -----------
Total equity capital .................    4,818,697
                                        -----------
Total liabilities and equity
 capital..............................  $57,536,995
                                        -----------
                                        -----------
</TABLE>

   I, Robert E. Keilman, Senior Vice President and 
Comptroller of the above-named bank do hereby declare 
that this Report of Condition has been prepared in 
conformance with the instructions issued by the Board of 
Governors of the Federal Reserve System and is true to 
the best of my knowledge and belief.

                                       Robert E. Keilman

   We, the undersigned directors, attest to the 
correctness of this Report of Condition and declare that 
it has been examined by us and to the best of our 
knowledge and belief has been prepared in conformance 
with the instructions issued by the Board of Governors of 
the Federal Reserve System and is true and correct.

                      
          J. Carter Bacot     )
          Thomas A. Renyi     )     Directors
          Alan R. Griffith    )
                              
- ----------------------------------------------------------

<PAGE>


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


                                       FORM T-1

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                               STATEMENT OF ELIGIBILITY
                      UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                       CORPORATION DESIGNATED TO ACT AS TRUSTEE

                         CHECK IF AN APPLICATION TO DETERMINE
                         ELIGIBILITY OF A TRUSTEE PURSUANT TO
                           SECTION 305(b)(2)           |__|

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

                                 THE BANK OF NEW YORK
                 (Exact name of trustee as specified in its charter)


New York                                             13-5160382
(State of incorporation                              (I.R.S. employer
if not a U.S. national bank)                         identification no.)

48 Wall Street, New York, N.Y.                       10286
(Address of principal executive offices)             (Zip code)

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

                          PUBLIC SERVICE COMPANY OF COLORADO
                 (Exact name of obligor as specified in its charter)


Colorado                                             84-0296600
(State or other jurisdiction of                      (I.R.S. employer
incorporation or organization)                       identification no.)

1225 17th Street
Denver, Colorado                                     80202
(Address of principal executive offices)             (Zip code)

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

                             Subordinated Debt Securities
                         (Title of the indenture securities)


===============================================================================
<PAGE>

1.   GENERAL INFORMATION.  FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a)  NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH
          IT IS SUBJECT.
          
- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the State of     2 Rector Street, New York, N.Y.
     New York                                    10006, and Albany, N.Y. 12203

     Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                 N.Y. 10045

     Federal Deposit Insurance Corporation       Washington, D.C. 20429

     New York Clearing House Association         New York, New York 10005

     (b)  WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2.   AFFILIATIONS WITH OBLIGOR.
     
     IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH SUCH
     AFFILIATION. 

     None.

16.  LIST OF EXHIBITS. 

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION, ARE
     INCORPORATED HEREIN BY REFERENCE AS AN EXHIBIT HERETO, PURSUANT TO RULE
     7A-29 UNDER THE TRUST INDENTURE ACT OF 1939 (THE "ACT") AND 17 C.F.R.
     229.10(d).

     1.   A copy of the Organization Certificate of The Bank of New York
          (formerly Irving Trust Company) as now in effect, which contains the
          authority to commence business and a grant of powers to exercise
          corporate trust powers.  (Exhibit 1 to Amendment No. 1 to Form T-1
          filed with Registration Statement No. 33-6215, Exhibits 1a and 1b to
          Form T-1 filed with Registration Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

                                        -2-
<PAGE>

     6.   The consent of the Trustee required by Section 321(b) of the Act. 
          (Exhibit 6 to Form T-1 filed with Registration Statement No.
          33-44051.)

     7.   A copy of the latest report of condition of the Trustee published
          pursuant to law or to the requirements of its supervising or examining
          authority.



                                      -3-
<PAGE>


                                      SIGNATURE



     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation organized and existing under the laws of the State of New York,
has duly caused this statement of eligibility to be signed on its behalf by the
undersigned, thereunto duly authorized, all in The City of New York, and State
of New York, on the 4th day of March, 1998.


                                             THE BANK OF NEW YORK



                                             By: /s/ James W.P. Hall   
                                                 ----------------------------
                                                 Name:  James W.P. Hall
                                                 Title: Vice President

<PAGE>

                                                 EXHIBIT 7
- ----------------------------------------------------------

         Consolidated Report of Condition of
                THE BANK OF NEW YORK
       of 48 Wall Street, New York, N.Y. 10286

   And Foreign and Domestic Subsidiaries, a member of 
the Federal Reserve System, at the close of business 
September 30, 1997, published in accordance with a call 
made by the Federal Reserve Bank of this District pursuant 
to the provisions of the Federal Reserve Act.

<TABLE>
                                       Dollar Amounts
ASSETS                                  in Thousands
<S>                                     <C>
Cash and balances due from depos-
 itory institutions:
  Noninterest-bearing balances and
   currency and coin .................  $ 5,004,638
  Interest-bearing balances ..........    1,271,514
Securities:
  Held-to-maturity securities ........    1,105,782
  Available-for-sale securities ......    3,164,271
Federal funds sold and Securities pur-
 chased under agreements to resell....    5,723,829
Loans and lease financing
 receivables:
  Loans and leases, net of unearned
   income.............................   34,916,196
  LESS: Allowance for loan and
   lease losses.......................      581,177
  LESS: Allocated transfer risk
   reserve............................          429
  Loans and leases, net of unearned
   income, allowance, and reserve.....   34,334,590
Assets held in trading accounts ......    2,035,284
Premises and fixed assets (including
 capitalized leases)..................      671,664
Other real estate owned ..............       13,306
Investments in unconsolidated
 subsidiaries and associated
 companies............................      210,685
Customers' liability to this bank on
 acceptances outstanding..............    1,463,446
Intangible assets.....................      753,190
Other assets..........................    1,784,796
                                        -----------
Total assets..........................  $57,536,995
                                        -----------
                                        -----------
LIABILITIES
Deposits:
  In domestic offices.................  $27,270,824
  Noninterest-bearing.................   12,160,977
  Interest-bearing....................   15,109,847
  In foreign offices, Edge and
   Agreement subsidiaries, and IBFs...   14,687,806
  Noninterest-bearing.................      657,479
  Interest-bearing....................   14,030,327
Federal funds purchased and Securities
 sold under agreements to repurchase..    1,946,099
Demand notes issued to the U.S.
 Treasury.............................      283,793
Trading liabilities ..................    1,553,539
Other borrowed money:
  With remaining maturity of one year
   or less............................    2,245,014
  With remaining maturity of more than
   one year through three years.......            0
  With remaining maturity of more than
   three years........................       45,664
Bank's liability on acceptances exe-
 cuted and outstanding................    1,473,588
Subordinated notes and debentures.....    1,018,940
Other liabilities.....................    2,193,031
                                        -----------
Total liabilities.....................   52,718,298
                                        -----------
EQUITY CAPITAL
Common stock..........................    1,135,284
Surplus...............................      731,319
Undivided profits and capital
 reserves.............................    2,943,008
Net unrealized holding gains
 (losses) on available-for-sale
 securities...........................       25,428
Cumulative foreign currency transla-
 tion adjustments.....................      (16,342)
                                        -----------
Total equity capital .................    4,818,697
                                        -----------
Total liabilities and equity
 capital..............................  $57,536,995
                                        -----------
                                        -----------
</TABLE>

   I, Robert E. Keilman, Senior Vice President and 
Comptroller of the above-named bank do hereby declare 
that this Report of Condition has been prepared in 
conformance with the instructions issued by the Board of 
Governors of the Federal Reserve System and is true to 
the best of my knowledge and belief.

                                       Robert E. Keilman

   We, the undersigned directors, attest to the 
correctness of this Report of Condition and declare that 
it has been examined by us and to the best of our 
knowledge and belief has been prepared in conformance 
with the instructions issued by the Board of Governors of 
the Federal Reserve System and is true and correct.

                      
          J. Carter Bacot     )
          Thomas A. Renyi     )     Directors
          Alan R. Griffith    )
                              
- ----------------------------------------------------------

<PAGE>


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


                                       FORM T-1

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                               STATEMENT OF ELIGIBILITY
                      UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                       CORPORATION DESIGNATED TO ACT AS TRUSTEE

                         CHECK IF AN APPLICATION TO DETERMINE
                         ELIGIBILITY OF A TRUSTEE PURSUANT TO
                           SECTION 305(b)(2)           |__|

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

                                 THE BANK OF NEW YORK
                 (Exact name of trustee as specified in its charter)


New York                                               13-5160382
(State of incorporation                                (I.R.S. employer
if not a U.S. national bank)                           identification no.)

48 Wall Street, New York, N.Y.                         10286
(Address of principal executive offices)               (Zip code)

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

                          PUBLIC SERVICE COMPANY OF COLORADO
                 (Exact name of obligor as specified in its charter)


Colorado                                               84-0296600
(State or other jurisdiction of                        (I.R.S. employer
incorporation or organization)                         identification no.)

1225 17th Street
Denver, Colorado                                       80202
(Address of principal executive offices)               (Zip code)

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

                         Guarantee of Preferred Securities of
                                 PSCO Capital Trust I
                         (Title of the indenture securities)


================================================================================
<PAGE>

1.   GENERAL INFORMATION.  FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a)  NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH
          IT IS SUBJECT.
          
- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the State of     2 Rector Street, New York, N.Y.
     New York                                    10006, and Albany, N.Y. 12203

     Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                 N.Y. 10045

     Federal Deposit Insurance Corporation       Washington, D.C. 20429

     New York Clearing House Association         New York, New York 10005

     (b)  WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2.   AFFILIATIONS WITH OBLIGOR.
     
     IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH SUCH
     AFFILIATION. 

     None.

16.  LIST OF EXHIBITS. 

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION, ARE
     INCORPORATED HEREIN BY REFERENCE AS AN EXHIBIT HERETO, PURSUANT TO RULE
     7A-29 UNDER THE TRUST INDENTURE ACT OF 1939 (THE "ACT") AND 17 C.F.R.
     229.10(d).

     1.   A copy of the Organization Certificate of The Bank of New York
          (formerly Irving Trust Company) as now in effect, which contains the
          authority to commence business and a grant of powers to exercise
          corporate trust powers.  (Exhibit 1 to Amendment No. 1 to Form T-1
          filed with Registration Statement No. 33-6215, Exhibits 1a and 1b to
          Form T-1 filed with Registration Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

                                          -2-
<PAGE>

     6.   The consent of the Trustee required by Section 321(b) of the Act. 
          (Exhibit 6 to Form T-1 filed with Registration Statement No.
          33-44051.)

     7.   A copy of the latest report of condition of the Trustee published
          pursuant to law or to the requirements of its supervising or examining
          authority.



                                           -3-
<PAGE>


                                      SIGNATURE



     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation organized and existing under the laws of the State of New York,
has duly caused this statement of eligibility to be signed on its behalf by the
undersigned, thereunto duly authorized, all in The City of New York, and State
of New York, on the 4th day of March, 1998.


                                            THE BANK OF NEW YORK



                                            By: /s/ James W.P. Hall    
                                                -----------------------------
                                                Name:  James W.P. Hall
                                                Title: Vice President


<PAGE>

                                                 EXHIBIT 7
- ----------------------------------------------------------

         Consolidated Report of Condition of
                THE BANK OF NEW YORK
       of 48 Wall Street, New York, N.Y. 10286

   And Foreign and Domestic Subsidiaries, a member of 
the Federal Reserve System, at the close of business 
September 30, 1997, published in accordance with a call 
made by the Federal Reserve Bank of this District pursuant 
to the provisions of the Federal Reserve Act.

<TABLE>
                                       Dollar Amounts
ASSETS                                  in Thousands
<S>                                     <C>
Cash and balances due from depos-
 itory institutions:
  Noninterest-bearing balances and
   currency and coin .................  $ 5,004,638
  Interest-bearing balances ..........    1,271,514
Securities:
  Held-to-maturity securities ........    1,105,782
  Available-for-sale securities ......    3,164,271
Federal funds sold and Securities pur-
 chased under agreements to resell....    5,723,829
Loans and lease financing
 receivables:
  Loans and leases, net of unearned
   income.............................   34,916,196
  LESS: Allowance for loan and
   lease losses.......................      581,177
  LESS: Allocated transfer risk
   reserve............................          429
  Loans and leases, net of unearned
   income, allowance, and reserve.....   34,334,590
Assets held in trading accounts ......    2,035,284
Premises and fixed assets (including
 capitalized leases)..................      671,664
Other real estate owned ..............       13,306
Investments in unconsolidated
 subsidiaries and associated
 companies............................      210,685
Customers' liability to this bank on
 acceptances outstanding..............    1,463,446
Intangible assets.....................      753,190
Other assets..........................    1,784,796
                                        -----------
Total assets..........................  $57,536,995
                                        -----------
                                        -----------
LIABILITIES
Deposits:
  In domestic offices.................  $27,270,824
  Noninterest-bearing.................   12,160,977
  Interest-bearing....................   15,109,847
  In foreign offices, Edge and
   Agreement subsidiaries, and IBFs...   14,687,806
  Noninterest-bearing.................      657,479
  Interest-bearing....................   14,030,327
Federal funds purchased and Securities
 sold under agreements to repurchase..    1,946,099
Demand notes issued to the U.S.
 Treasury.............................      283,793
Trading liabilities ..................    1,553,539
Other borrowed money:
  With remaining maturity of one year
   or less............................    2,245,014
  With remaining maturity of more than
   one year through three years.......            0
  With remaining maturity of more than
   three years........................       45,664
Bank's liability on acceptances exe-
 cuted and outstanding................    1,473,588
Subordinated notes and debentures.....    1,018,940
Other liabilities.....................    2,193,031
                                        -----------
Total liabilities.....................   52,718,298
                                        -----------
EQUITY CAPITAL
Common stock..........................    1,135,284
Surplus...............................      731,319
Undivided profits and capital
 reserves.............................    2,943,008
Net unrealized holding gains
 (losses) on available-for-sale
 securities...........................       25,428
Cumulative foreign currency transla-
 tion adjustments.....................      (16,342)
                                        -----------
Total equity capital .................    4,818,697
                                        -----------
Total liabilities and equity
 capital..............................  $57,536,995
                                        -----------
                                        -----------
</TABLE>

   I, Robert E. Keilman, Senior Vice President and 
Comptroller of the above-named bank do hereby declare 
that this Report of Condition has been prepared in 
conformance with the instructions issued by the Board of 
Governors of the Federal Reserve System and is true to 
the best of my knowledge and belief.

                                       Robert E. Keilman

   We, the undersigned directors, attest to the 
correctness of this Report of Condition and declare that 
it has been examined by us and to the best of our 
knowledge and belief has been prepared in conformance 
with the instructions issued by the Board of Governors of 
the Federal Reserve System and is true and correct.

                      
          J. Carter Bacot     )
          Thomas A. Renyi     )     Directors
          Alan R. Griffith    )
                              
- ----------------------------------------------------------

<PAGE>

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


                                       FORM T-1

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                               STATEMENT OF ELIGIBILITY
                      UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                       CORPORATION DESIGNATED TO ACT AS TRUSTEE

                         CHECK IF AN APPLICATION TO DETERMINE
                         ELIGIBILITY OF A TRUSTEE PURSUANT TO
                           SECTION 305(b)(2)           |__|

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

                                 THE BANK OF NEW YORK
                 (Exact name of trustee as specified in its charter)


New York                                           13-5160382
(State of incorporation                            (I.R.S. employer
if not a U.S. national bank)                       identification no.)

48 Wall Street, New York, N.Y.                     10286
(Address of principal executive offices)           (Zip code)

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

                                 PSCO CAPITAL TRUST I
                 (Exact name of obligor as specified in its charter)


Delaware                                           Applied For
(State or other jurisdiction of                    (I.R.S. employer
incorporation or organization)                     identification no.)

1225 17th Street
Denver, Colorado                                   80202
(Address of principal executive offices)           (Zip code)

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

                                 Preferred Securities
                         (Title of the indenture securities)


================================================================================
<PAGE>

1.   GENERAL INFORMATION.  FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a)  NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH
          IT IS SUBJECT.
          
- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the State of     2 Rector Street, New York, N.Y.
     New York                                    10006, and Albany, N.Y. 12203

     Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                 N.Y. 10045

     Federal Deposit Insurance Corporation       Washington, D.C. 20429

     New York Clearing House Association         New York, New York 10005

     (b)  WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2.   AFFILIATIONS WITH OBLIGOR.
     
     IF THE OBLIGOR IS AN AFFILIATE OF THE TRUSTEE, DESCRIBE EACH SUCH
     AFFILIATION. 

     None.

16.  LIST OF EXHIBITS. 

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION, ARE
     INCORPORATED HEREIN BY REFERENCE AS AN EXHIBIT HERETO, PURSUANT TO RULE
     7A-29 UNDER THE TRUST INDENTURE ACT OF 1939 (THE "ACT") AND 17 C.F.R.
     229.10(d).

     1.   A copy of the Organization Certificate of The Bank of New York
          (formerly Irving Trust Company) as now in effect, which contains the
          authority to commence business and a grant of powers to exercise
          corporate trust powers.  (Exhibit 1 to Amendment No. 1 to Form T-1
          filed with Registration Statement No. 33-6215, Exhibits 1a and 1b to
          Form T-1 filed with Registration Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

                                          -2-
<PAGE>

     6.   The consent of the Trustee required by Section 321(b) of the Act. 
          (Exhibit 6 to Form T-1 filed with Registration Statement No.
          33-44051.)

     7.   A copy of the latest report of condition of the Trustee published
          pursuant to law or to the requirements of its supervising or examining
          authority.


                                          -3-
<PAGE>

                                      SIGNATURE



     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation organized and existing under the laws of the State of New York,
has duly caused this statement of eligibility to be signed on its behalf by the
undersigned, thereunto duly authorized, all in The City of New York, and State
of New York, on the 4th day of March, 1998.


                                            THE BANK OF NEW YORK



                                            By: /s/ James W.P. Hall  
                                                ------------------------------
                                                Name:  James W.P. Hall
                                                Title: Vice President





<PAGE>

                                                 EXHIBIT 7
- ----------------------------------------------------------

         Consolidated Report of Condition of
                THE BANK OF NEW YORK
       of 48 Wall Street, New York, N.Y. 10286

   And Foreign and Domestic Subsidiaries, a member of 
the Federal Reserve System, at the close of business 
September 30, 1997, published in accordance with a call 
made by the Federal Reserve Bank of this District pursuant 
to the provisions of the Federal Reserve Act.

<TABLE>
                                       Dollar Amounts
ASSETS                                  in Thousands
<S>                                     <C>
Cash and balances due from depos-
 itory institutions:
  Noninterest-bearing balances and
   currency and coin .................  $ 5,004,638
  Interest-bearing balances ..........    1,271,514
Securities:
  Held-to-maturity securities ........    1,105,782
  Available-for-sale securities ......    3,164,271
Federal funds sold and Securities pur-
 chased under agreements to resell....    5,723,829
Loans and lease financing
 receivables:
  Loans and leases, net of unearned
   income.............................   34,916,196
  LESS: Allowance for loan and
   lease losses.......................      581,177
  LESS: Allocated transfer risk
   reserve............................          429
  Loans and leases, net of unearned
   income, allowance, and reserve.....   34,334,590
Assets held in trading accounts ......    2,035,284
Premises and fixed assets (including
 capitalized leases)..................      671,664
Other real estate owned ..............       13,306
Investments in unconsolidated
 subsidiaries and associated
 companies............................      210,685
Customers' liability to this bank on
 acceptances outstanding..............    1,463,446
Intangible assets.....................      753,190
Other assets..........................    1,784,796
                                        -----------
Total assets..........................  $57,536,995
                                        -----------
                                        -----------
LIABILITIES
Deposits:
  In domestic offices.................  $27,270,824
  Noninterest-bearing.................   12,160,977
  Interest-bearing....................   15,109,847
  In foreign offices, Edge and
   Agreement subsidiaries, and IBFs...   14,687,806
  Noninterest-bearing.................      657,479
  Interest-bearing....................   14,030,327
Federal funds purchased and Securities
 sold under agreements to repurchase..    1,946,099
Demand notes issued to the U.S.
 Treasury.............................      283,793
Trading liabilities ..................    1,553,539
Other borrowed money:
  With remaining maturity of one year
   or less............................    2,245,014
  With remaining maturity of more than
   one year through three years.......            0
  With remaining maturity of more than
   three years........................       45,664
Bank's liability on acceptances exe-
 cuted and outstanding................    1,473,588
Subordinated notes and debentures.....    1,018,940
Other liabilities.....................    2,193,031
                                        -----------
Total liabilities.....................   52,718,298
                                        -----------
EQUITY CAPITAL
Common stock..........................    1,135,284
Surplus...............................      731,319
Undivided profits and capital
 reserves.............................    2,943,008
Net unrealized holding gains
 (losses) on available-for-sale
 securities...........................       25,428
Cumulative foreign currency transla-
 tion adjustments.....................      (16,342)
                                        -----------
Total equity capital .................    4,818,697
                                        -----------
Total liabilities and equity
 capital..............................  $57,536,995
                                        -----------
                                        -----------
</TABLE>

   I, Robert E. Keilman, Senior Vice President and 
Comptroller of the above-named bank do hereby declare 
that this Report of Condition has been prepared in 
conformance with the instructions issued by the Board of 
Governors of the Federal Reserve System and is true to 
the best of my knowledge and belief.

                                       Robert E. Keilman

   We, the undersigned directors, attest to the 
correctness of this Report of Condition and declare that 
it has been examined by us and to the best of our 
knowledge and belief has been prepared in conformance 
with the instructions issued by the Board of Governors of 
the Federal Reserve System and is true and correct.

                      
          J. Carter Bacot     )
          Thomas A. Renyi     )     Directors
          Alan R. Griffith    )
                              
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