PUBLIC SERVICE CO OF COLORADO
424B2, 1996-11-07
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>

                  
PROSPECTUS SUPPLEMENT
(To Prospectus dated November 7, 1996)
                                 $250,000,000
                                    [LOGO]
                      PUBLIC SERVICE COMPANY OF COLORADO

                       Secured Medium-Term Notes, Series B
                (being a series of First Collateral Trust Bonds)
                         Due From Nine Months To Thirty
                            Years From Date of Issue

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

      Public Service  Company of Colorado (the "Company") may offer from time to
time up to $250,000,000  aggregate  principal amount of its Secured  Medium-Term
Notes,  Series B (being a series of First Collateral Trust Bonds) (the "Notes").
Each Note will mature on a date from nine  months to thirty  years from its date
of issue,  as specified in the  applicable  pricing  supplement  hereto (each, a
"Pricing  Supplement"),  and may be subject to  redemption  at the option of the
Company or repayment at the option of the Holder thereof, in each case, in whole
or in part,  prior to its Stated  Maturity,  and may be  subject  to  redemption
pursuant to sinking fund or other mandatory redemption provisions,  if specified
in the  applicable  Pricing  Supplement.  The Notes  will be  issued in  minimum
denominations of $100,000 and any greater amount that is an integral multiple of
$1,000.

      Each Note will bear  interest at a fixed rate.  Interest on each Note will
accrue from its date of issue and, unless otherwise  specified in the applicable
Pricing  Supplement,  will be payable  semiannually in arrears on February 1 and
August 1 of each year and at Maturity. Notes may also be issued that do not bear
any interest currently or that bear interest at a below market rate.

      The variable  terms of each Note will be established by the Company on the
date of issue  of such  Note and will be  specified  in the  applicable  Pricing
Supplement. Interest rates and other terms of the Notes are subject to change by
the Company,  but no such change will affect any Note previously issued or as to
which an offer to purchase has been accepted by the Company.

      Each Note will be issued in book-entry  form (a  "Book-Entry  Note") or in
fully registered  certificated form (a "Certificated Note"), as specified in the
applicable Pricing  Supplement.  Each Book-Entry Note will be represented by one
or more fully registered global securities (the "Global  Securities")  deposited
with or on behalf of The  Depository  Trust  Company  (or such other  depositary
identified  in  the  applicable  Pricing   Supplement)  (the  "Depositary")  and
registered in the name of the Depositary or the Depositary's nominee.  Interests
in the  Global  Securities  will be shown  on,  and  transfers  thereof  will be
effected only through, records maintained by the Depositary (with respect to its
participants)  and the  Depositary's  participants  (with  respect to beneficial
owners).  Except  in  limited  circumstances,   Book-Entry  Notes  will  not  be
exchangeable for Certificated Notes.

  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 SUPPLEMENT, THE PROSPECTUS OR ANY
  SUPPLEMENT HERETO. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

==============================================================+=================
                     Price to      Agents' Discounts            Proceeds to
                     Public(1)   and Commissions(1)(2)        Company (1)(3)
- --------------------------------------------------------------------------------
 Per Note........      100%         .125%-.750%              99.875%-99.250%
- --------------------------------------------------------------------------------
 Total ..........  $250,000,000  $312,500-$1,875,000   $249,267,500-$247,705,000
================================================================================

(1)  Merrill Lynch & Co., Merill Lynch, Pierce,  Fenner & Smith Incorporated and
     Goldman,  Sachs & Co. (the "Agents"),  individually or in a syndicate,  may
     purchase Notes, as principal,  from the Company for resale to investors and
     other purchasers at varying prices relating to prevailing  market prices at
     the  time of  resale  as  determined  by the  applicable  Agent  or,  if so
     specified  in the  applicable  Pricing  Supplement,  for  resale at a fixed
     offering  price.  Unless  otherwise  specified  in the  applicable  Pricing
     Supplement,  any Note sold to an Agent as  principal  will be  purchased by
     such Agent at a price equal to 100% of the principal  amount thereof less a
     percentage of the principal amount equal to the commission applicable to an
     agency  sale (as  described  below)  of a Note of  identical  maturity.  If
     requested by the Company and agreed to by an Agent,  such Agent may utilize
     its reasonable efforts on an agency basis to solicit offers to purchase the
     Notes at 100% of the principal amount thereof,  unless otherwise  specified
     in the applicable Pricing Supplement.  The Company will pay a commission to
     an Agent,  ranging from .125% to .750% of the  principal  amount of a Note,
     depending  upon its stated  maturity,  sold through an Agent.  See "Plan of
     Distribution".

(2)  The Company has agreed to indemnify the Agents against certain liabilities,
     including  liabilities  under the Securities  Act of 1933, as amended.  See
     "Plan of Distribution."

(3)  Before deducting expenses payable by the Company estimated at $421,213.

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

      The Notes are being offered on a continuing  basis directly by the Company
or by the Company to or through the Agents.  Unless  otherwise  specified in the
applicable  Pricing  Supplement,  the Notes will not be listed on any securities
exchange.  There is no assurance  that the Notes offered hereby will be sold or,
if sold, that there will be a secondary market for the Notes or liquidity in the
secondary  market if one develops.  The Company  reserves the right to cancel or
modify the offer made hereby  without  notice.  The  Company or an Agent,  if it
solicits the offer on an agency basis, may reject any offer to purchase Notes in
whole or in part. See "Plan of Distribution".

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

Merrill Lynch & Co.                                       Goldman, Sachs & Co.
                               -------------------

            The date of this Prospectus Supplement is November 7, 1996.


<PAGE>


      IN CONNECTION WITH AN OFFERING OF NOTES PURCHASED BY ONE OR MORE AGENTS AS
PRINCIPAL ON A FIXED  OFFERING  PRICE BASIS,  SUCH  AGENT(S) MAY  OVER-ALLOT  OR
EFFECT  TRANSACTIONS  WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF NOTES AT A
LEVEL  ABOVE  THAT  WHICH  MIGHT  OTHERWISE  PREVAIL  IN THE OPEN  MARKET.  SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

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

                     SUPPLEMENTAL DESCRIPTION OF THE NOTES

      The  following   description  of  the   particular   terms  of  the  Notes
supplements,  and to the extent inconsistent therewith replaces, the description
of the general terms and provisions of the Notes set forth under "Description of
the New Bonds" in the  accompanying  Prospectus,  to which  reference  is hereby
made.  Certain  capitalized terms used herein are defined under  "Description of
the New Bonds" in the accompanying Prospectus.

General

      The Notes  will be  issued  from  time to time in an  aggregate  principal
amount not to exceed  $250,000,000,  as a series of First Collateral Trust Bonds
under the 1993 Mortgage. The Notes will be issued on the basis of Class A Bonds,
which are to be issued  under the 1939  Mortgage.  See  "Description  of the New
Bonds" in the accompanying Prospectus.

      The Notes will be issued in fully  registered form only,  without coupons.
Each Note will be issued as a Book-Entry  Note  represented by one or more fully
registered  Global  Securities or as a  Certificated  Note.  Except as set forth
herein  under  "Book-Entry  Notes"  or in any  Pricing  Supplement  relating  to
specific  Notes,  the Notes will not be  issuable  as  Certificated  Notes.  The
authorized  denominations  of the Notes will be $100,000 and any greater  amount
that is an integral multiple of $1,000.

      Each Note will mature on a date from nine months to thirty  years from its
date of  issue.  Each Note may also be  subject  to  redemption  prior to Stated
Maturity at the option of the Company or at the option of the Holder, and may be
subject to  redemption  pursuant to sinking fund or other  mandatory  redemption
provisions, all as may be set forth in the applicable Pricing Supplement.

      The Pricing  Supplement  relating to a Note will  describe  the  following
terms:  (i) the price  (expressed  as a percentage  of the  aggregate  principal
amount  thereof) at which such Note will be issued;  (ii) the date on which such
Note will be issued (the  "Original  Issue Date");  (iii) the date on which such
Note will mature (the "Stated Maturity");  (iv) the rate per annum at which such
Note will bear interest;  (v) whether such Note may be redeemed at the option of
the Company  prior to Stated  Maturity as  described  under  "Redemption  at the
Option of the  Company"  below  and,  if so,  the  provisions  relating  to such
redemption;  (vi) the  obligation of the Company to redeem such Note pursuant to
any sinking fund or other  mandatory  redemption  provisions  applicable to such
Note;  (vii) any  provisions for the repayment of such Note at the option of the
Holder as described  under  "Repayment at the Option of the Holder"  below;  and
(vii) any other special terms of such Notes.

      Interest rates offered by the Company with respect to the Notes may differ
depending upon,  among other factors,  the aggregate  principal  amount of Notes
purchased in any single  transaction.  Notes with different variable terms other
than interest  rates may also be offered  concurrently  to different  investors.
Interest  rates and other  terms of Notes are  subject to change by the  Company
from time to time, but no such change will affect any Note previously  issued or
as to which an offer to purchase has been accepted by the Company.

Payment of Principal and Interest

      Each Note  will bear  interest,  computed  on the basis of a 360-day  year
consisting of twelve 30-day months, from its Original Issue Date at the rate per
annum stated on the face thereof and in the applicable  Pricing Supplement until
the  principal  amount  thereof  is paid or duly  made  available  for  payment.
Interest on each Note

                                      S-2

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will be payable semiannually in arrears on February 1 and August 1 in each year,
or such other dates as may be specified  in the  applicable  Pricing  Supplement
(each such date being  hereinafter  called an  "Interest  Payment  Date") and at
maturity (whether at Stated Maturity, by declaration of acceleration,  upon call
for redemption or otherwise, hereinafter "Maturity"). Unless otherwise specified
in the  applicable  Pricing  Supplement,  interest  payments  will be made in an
amount  equal  to the  interest  accrued  from  and  including  the  immediately
preceding  Interest  Payment Date in respect of which  interest has been paid or
duly made  available for payment (or from and including the Original Issue Date,
if no  interest  has  been  paid or duly  made  available  for  payment)  to but
excluding the applicable  Interest Payment Date or the Stated  Maturity,  as the
case may be.

      Payments  of  interest  on the  Notes  (other  than  interest  payable  at
Maturity) will be made, except as provided below, by check mailed to the Holders
of such Notes as of the Record Date (as hereinafter defined) next preceding each
Interest  Payment  Date,  except  that  (a) in the  case  of  Global  Securities
representing  Book-Entry  Notes,  such payment will be made in  accordance  with
arrangements then in effect among the Company, the 1993 Mortgage Trustee and the
Depository,  (b) if the Original Issue Date of a Note is after a Record Date and
before the corresponding Interest Payment Date, the first payment of interest on
such  Note  will be made on the next  succeeding  Interest  Payment  Date to the
Holder of such Note on the Record Date with respect to such succeeding  Interest
Payment Date and (c) if the Company  defaults in the payment of the interest due
on any Note on any  Interest  Payment  Date,  such  defaulted  interest  will be
payable to the Holder of such Note as of a Special Record Date fixed by the 1993
Mortgage Trustee, which shall be not more than 30 days and not less than 10 days
prior to the date of  payment  of such  defaulted  interest,  or  payable to the
Holder in such other manner as permitted by the 1993 Mortgage.  See  "Book-Entry
Notes".  Unless otherwise  specified in the applicable Pricing  Supplement,  the
"Record Date" with respect to each Interest  Payment Date will be the January 15
or July 15, as the case may be, next preceding such Interest Payment Date.

      Unless  otherwise  specified in the  applicable  Pricing  Supplement,  the
principal of, premium, if any, and interest on any Note payable at Maturity will
be paid upon surrender thereof at the office of the 1993 Mortgage Trustee.

      If the date of making any payment with respect to a Note is not a Business
Day,  such  payment  may be made on the next  succeeding  Business  Day,  and if
payment is made or duly provided for on such succeeding Business Day no interest
shall accrue for the period from and after such Interest Payment Date. "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 are generally
authorized or required by law, regulation or executive order to remain closed.

Redemption at the Option of the Company

      Unless otherwise specified in the applicable Pricing Supplement, the Notes
will not be subject to any sinking  fund.  The Notes will be  redeemable  at the
option of the Company  prior to Stated  Maturity  only if an Initial  Redemption
Date is specified in the applicable  Pricing  Supplement.  If so specified,  the
Notes will be subject to  redemption at the option of the Company on any date on
and after the applicable  Initial  Redemption Date in whole or from time to time
in part in increments of $1,000  (provided that any remaining  principal  amount
thereof shall be at least  $100,000),  at the  applicable  Redemption  Price (as
hereinafter defined),  together with unpaid interest accrued thereon to the date
of redemption,  on written notice given to the Holders  thereof not more than 60
nor less than 30 calendar days prior to the date of redemption and in accordance
with the provisions of the 1993 Mortgage.  "Redemption Price", with respect to a
Note, means an amount equal to the Initial  Redemption  Percentage  specified in
the  applicable  Pricing  Supplement  (as  adjusted  by  the  Annual  Redemption
Percentage Reduction,  if applicable)  multiplied by the unpaid principal amount
to be redeemed. The Initial Redemption Percentage,  if any, applicable to a Note
shall decline at each  anniversary of the Initial  Redemption  Date by an amount
equal to the applicable Annual Redemption  Percentage  Reduction,  if any, until
the  Redemption  Price is equal to 100% of the  unpaid  principal  amount  to be
redeemed.


                                      S-3

<PAGE>



Repayment at the Option of the Holder

      The Notes will be  repayable  by the  Company at the option of the Holders
thereof  prior  to the  Stated  Maturity  thereof  only if one or more  Optional
Repayment  Dates are  specified  in the  applicable  Pricing  Supplement.  If so
specified,  the Notes will be subject to  repayment at the option of the Holders
thereof on any Optional  Repayment Date in whole or from time to time in part in
increments of $1,000 (provided that any remaining principal amount thereof shall
be at  least  $100,000),  at a  repayment  price  equal  to 100%  of the  unpaid
principal amount to be repaid,  together with unpaid interest accrued thereon to
the date of  repayment.  For any Note to be repaid,  such Note must be received,
together  with the form  thereon  entitled  "Option  to  Elect  Repayment"  duly
completed, at the office of the 1993 Mortgage Trustee, not more than 60 nor less
than 30 calendar days prior to the date of repayment. Exercise of such repayment
option by the Holder will be irrevocable.

      Only the Depositary may exercise the repayment option in respect of Global
Securities  representing Book- Entry Notes.  Accordingly,  Beneficial Owners (as
hereinafter defined) of Global Securities that desire to have all or any portion
of the  Book-Entry  Notes  represented  by such  Global  Securities  repaid must
instruct the Participant (as hereinafter  defined)  through which they own their
interest to direct the  Depositary  to exercise  the  repayment  option on their
behalf by delivering  the related Global  Security and duly  completed  election
form to the 1993  Mortgage  Trustee as  aforesaid.  In order to ensure that such
Global Security and election form are received by the 1993 Mortgage Trustee on a
particular day, the applicable Beneficial Owner must so instruct the Participant
through  which it owns its  interest  before  such  Participant's  deadline  for
accepting  instructions  for  that  day.  Different  firms  may  have  different
deadlines  for  accepting   instructions  from  their  customers.   Accordingly,
Beneficial  Owners should consult the Participants  through which they own their
interest for the respective  deadlines for such  Participants.  All instructions
given to Participants from Beneficial  Owners of Global  Securities  relating to
the option to elect  repayment shall be  irrevocable.  In addition,  at the time
such  instructions  are  given,  each  such  Beneficial  Owner  shall  cause the
Participant  through  which it owns its  interest  to transfer  such  Beneficial
Owner's  interest in the Global Security or Securities  representing the related
Book-Entry Notes, on the Depositary's records, to the 1993 Mortgage Trustee. See
"Book-Entry Notes".

      If applicable,  the Company will comply with the  requirements  of Section
14(e) of the Securities  Exchange Act of 1934, as amended (the "Exchange  Act"),
and  the  rules  promulgated  thereunder,  and  any  other  securities  laws  or
regulations in connection with any such repayment.

      The Company may at any time  purchase  Notes at any price or prices in the
open  market  or  otherwise.  Notes so  purchased  by the  Company  may,  at the
discretion of the Company,  be held,  resold or  surrendered  to the Trustee for
cancellation.

Book-Entry Notes

      The Company has established a depositary  arrangement  with The Depository
Trust  Company  with  respect to the  Book-Entry  Notes,  the terms of which are
summarized   below.   Any  additional  or  differing  terms  of  the  depositary
arrangement  with  respect  to the  Book-Entry  Notes will be  described  in the
applicable Pricing Supplement.

      Upon  issuance,  all  Book-Entry  Notes  of like  tenor  and  terms  up to
$200,000,000  aggregate  principal amount will be represented by a single Global
Security.  Each Global Security representing  Book-Entry Notes will be deposited
with, or on behalf of, the  Depositary and will be registered in the name of the
Depositary or a nominee of the Depositary. No Global Security may be transferred
except as a whole by a nominee of the Depositary to the Depositary or to another
nominee of the  Depositary,  or by the Depositary or such nominee to a successor
of the Depositary or a nominee of such successor.

      So long as the  Depositary  or its  nominee is the  registered  owner of a
Global Security,  the Depositary or its nominee, as the case may be, will be the
sole Holder of the Book-Entry Notes  represented  thereby for all purposes under
the 1993 Mortgage.  Except as otherwise provided below, the Beneficial Owners of
the Global  Security or  Securities  representing  Book-Entry  Notes will not be
entitled  to receive  physical  delivery of  Certificated  Notes and will not be
considered the Holders  thereof for any purpose under the 1993 Mortgage,  and no
Global

                                      S-4

<PAGE>



Security  representing  Book-Entry  Notes shall be exchangeable or transferable.
Accordingly, each Beneficial Owner must rely on the procedures of the Depositary
and, if such  Beneficial  Owner is not a  Participant,  on the procedures of the
Participant  through which such  Beneficial  Owner owns its interest in order to
exercise any rights of a Holder under such Global Security or the 1993 Mortgage.
The laws of some  jurisdictions  require that certain  purchasers  of securities
take physical delivery of such securities in certificated  form. Such limits and
laws may  impair  the  ability  to  transfer  beneficial  interests  in a Global
Security representing Book-Entry Notes.

     Unless  otherwise  specified in the  applicable  Pricing  Supplement,  each
Global  Security   representing   Book-Entry  Notes  will  be  exchangeable  for
Certificated  Notes  of  like  tenor  and  terms  and  of  differing  authorized
denominations in a like aggregate  principal amount,  only if (i) the Depositary
notifies  the Company and the 1993  Mortgage  Trustee  that it is  unwilling  or
unable to  continue  as  Depositary  for the Global  Securities  or the  Company
becomes aware that the Depositary has ceased to be a clearing agency  registered
under  the  Exchange  Act and,  in any such  case,  the  Company  shall not have
appointed a successor  to the  Depositary  within 90 days  thereafter,  (ii) the
Company, in its sole discretion,  determines that the Global Securities shall be
exchangeable  for  Certificated  Notes or (iii) an Event of  Default  shall have
occurred and be  continuing  with respect to the Notes under the 1993  Mortgage,
the 1993 Mortgage  Trustee shall have given notice  thereof to the Holders,  and
there shall have been delivered to the Company and the 1993 Mortgage  Trustee an
Opinion of Counsel to the effect that the interests of the beneficial  owners of
the Global  Securities  will be  materially  impaired  unless such owners become
Holders of Certificated  Notes. Upon any such exchange,  the Certificated  Notes
shall be registered in the names of the Beneficial Owners of the Global Security
or Securities  representing  Book-Entry Notes,  which names shall be provided by
the Depositary's  relevant Participants (as identified by the Depositary) to the
1993 Mortgage Trustee.

      The following is based on information furnished by the Depositary:

            The Depositary will act as securities  depository for the Book-Entry
      Notes. The Book-Entry Notes will be issued as fully registered  securities
      registered  in the  name  of  Cede  & Co.  (the  Depositary's  partnership
      nominee).  One fully  registered  Global  Security will be issued for each
      issue of Book-Entry Notes, each in the aggregate  principal amount of such
      issue,  and  will be  deposited  with the  Depositary.  If,  however,  the
      aggregate principal amount of any issue exceeds  $200,000,000,  one Global
      Security  will be issued with  respect to each  $200,000,000  of principal
      amount and an  additional  Global  Security will be issued with respect to
      any remaining principal amount of such issue.

            The Depositary is a  limited-purpose  trust company  organized under
      the New York Banking Law, a "banking  organization"  within the meaning of
      the New York  Banking  Law,  a member of the  Federal  Reserve  System,  a
      "clearing  corporation"  within  the  meaning  of  the  New  York  Uniform
      Commercial  Code,  and a  "clearing  agency"  registered  pursuant  to the
      provisions  of Section  17A of the  Exchange  Act.  The  Depositary  holds
      securities  that  its  participants   ("Participants")  deposit  with  the
      Depositary.   The  Depositary  also   facilitates  the  settlement   among
      Participants of securities transactions, such as transfers and pledges, in
      deposited securities through electronic computerized book-entry changes in
      Participants' accounts, thereby eliminating the need for physical movement
      of securities certificates. Direct Participants of the Depositary ("Direct
      Participants")  include  securities  brokers  and dealers  (including  the
      Agents),  banks, trust companies,  clearing corporations and certain other
      organizations.  The  Depositary  is  owned  by  a  number  of  its  Direct
      Participants and by the New York Stock Exchange,  Inc., the American Stock
      Exchange,  Inc., and the National Association of Securities Dealers,  Inc.
      Access to the  Depositary's  system is also  available  to others  such as
      securities  brokers  and  dealers,  banks and trust  companies  that clear
      through or maintain a custodial  relationship  with a Direct  Participant,
      either  directly  or  indirectly  ("Indirect  Participants").   The  rules
      applicable to the  Depositary  and its  Participants  are on file with the
      Securities and Exchange Commission.

            Purchases of Book-Entry Notes under the Depositary's  system must be
      made by or through  Direct  Participants,  which will receive a credit for
      such Book-Entry Notes on the Depositary's  records. The ownership interest
      of each actual  purchaser of each Book-Entry Note  represented by a Global
      Security  ("Beneficial Owner") is in turn to be recorded on the records of
      Direct Participants and Indirect Participants.  Beneficial Owners will not
      receive written confirmation from the Depositary of their

                                      S-5

<PAGE>



      purchase,   but  Beneficial   Owners  are  expected  to  receive   written
      confirmations  providing  details of the transaction,  as well as periodic
      statements of their  holdings,  from the Direct  Participants  or Indirect
      Participants   through  which  such  Beneficial  Owner  entered  into  the
      transaction.  Transfers  of  ownership  interests  in  a  Global  Security
      representing  Book-Entry  Notes are to be  accomplished by entries made on
      the  books  of  Participants   acting  on  behalf  of  Beneficial  Owners.
      Beneficial Owners of a Global Security representing  Book-Entry Notes will
      not receive  Certificated  Notes  representing  their ownership  interests
      therein,  except in the event that use of the  book-entry  system for such
      Book-Entry Notes is discontinued.

            To   facilitate   subsequent   transfers,   all  Global   Securities
      representing  Book-Entry  Notes which are deposited with, or on behalf of,
      the  Depositary are  registered in the name of the  Depositary's  nominee,
      Cede & Co. The  deposit of Global  Securities  with,  or on behalf of, the
      Depositary  and  their  registration  in the name of Cede & Co.  effect no
      change in beneficial  ownership.  The  Depositary  has no knowledge of the
      actual  Beneficial  Owners  of  the  Global  Securities  representing  the
      Book-Entry  Notes; the  Depositary's  records reflect only the identity of
      the  Direct  Participants  to whose  accounts  such  Book-Entry  Notes are
      credited,  which may or may not be the Beneficial Owners. The Participants
      will remain responsible for keeping account of their holdings on behalf of
      their customers.

            Conveyance of notices and other  communications by the Depositary to
      Direct Participants, by Direct Participants to Indirect Participants,  and
      by Direct Participants and Indirect Participants to Beneficial Owners will
      be  governed  by  arrangements  among them,  subject to any  statutory  or
      regulatory requirements as may be in effect from time to time.

            Neither  the  Depositary  nor Cede & Co.  will  consent or vote with
      respect to the Global Securities  representing the Book-Entry Notes. Under
      its usual procedures, the Depositary mails an Omnibus Proxy to the Company
      as soon as possible  after the  applicable  record date. The Omnibus Proxy
      assigns  Cede  &  Co.'s  consenting  or  voting  rights  to  those  Direct
      Participants  to whose accounts the  Book-Entry  Notes are credited on the
      applicable  record date  (identified in a listing  attached to the Omnibus
      Proxy).

            Principal, premium, if any, and/or interest, if any, payments on the
      Global  Securities  representing  the  Book-Entry  Notes  will  be made in
      immediately  available funds to the Depositary.  The Depositary's practice
      is to credit Direct Participants'  accounts on the applicable payment date
      in accordance  with their  respective  holdings shown on the  Depositary's
      records  unless the  Depositary  has  reason to  believe  that it will not
      receive  payment on such date.  Payments  by  Participants  to  Beneficial
      Owners will be governed by standing  instructions and customary practices,
      as is the case with  securities  held for the  accounts  of  customers  in
      bearer form or registered in "street name", and will be the responsibility
      of such  Participant and not of the Depositary,  the 1993 Mortgage Trustee
      or the Company, subject to any statutory or regulatory requirements as may
      be in effect from time to time.  Payment of  principal,  premium,  if any,
      and/or interest,  if any, to the Depositary is the  responsibility  of the
      Company and the 1993 Mortgage  Trustee,  disbursement  of such payments to
      Direct  Participants  shall be the  responsibility of the Depositary,  and
      disbursement  of such  payments  to the  Beneficial  Owners  shall  be the
      responsibility of Direct Participants and Indirect Participants.

            If  applicable,  redemption  notices  shall be sent to Cede & Co. If
      less than all of the  Book-Entry  Notes of like  tenor and terms are being
      redeemed,  the Depositary's  practice is to determine by lot the amount of
      the interest of each Direct Participant in such issue to be redeemed.

            A Beneficial  Owner shall give notice of any option to elect to have
      its Book-Entry Notes repaid by the Company,  through its  Participant,  to
      the 1993 Mortgage  Trustee,  and shall effect  delivery of such Book-Entry
      Notes by causing  the Direct  Participant  to transfer  the  Participant's
      interest in the Global Security or Securities representing such Book-Entry
      Notes, on the  Depositary's  records,  to the 1993 Mortgage  Trustee.  The
      requirement for physical delivery of Book-Entry Notes in connection with a
      demand for repayment will be deemed satisfied when the ownership rights in
      the Global Security or Securities  representing  such Book-Entry Notes are
      transferred by Direct Participants on the Depositary's records.


                                      S-6

<PAGE>



            The Depositary may discontinue  providing its services as securities
      depository  with  respect  to the  Book-Entry  Notes at any time by giving
      reasonable notice to the Company or the 1993 Mortgage Trustee.  Under such
      circumstances,  in the event that a successor securities depository is not
      obtained, Certificated Notes are required to be printed and delivered.

      The  Company  may decide to  discontinue  use of the system of  book-entry
transfers through the Depositary (or a successor securities depository). In that
event, Certificated Notes will be printed and delivered.

      The  information  in  this  section  concerning  the  Depositary  and  the
Depositary's  system has been obtained from sources that the Company believes to
be reliable, but the Company takes no responsibility for the accuracy thereof.

      None of the Company, the 1993 Mortgage Trustee or any agent for payment on
or   registration   of   transfer  or  exchange  of  the  Notes  will  have  any
responsibility  or  liability  for any  aspect  of the  records  relating  to or
payments  made on account of  beneficial  interests  in such  Global Note or for
maintaining,  supervising or reviewing any records  relating to such  beneficial
interests.


                                      S-7

<PAGE>



                             PLAN OF DISTRIBUTION

      The Notes are being offered on a continuing basis for sale directly by the
Company or by the  Company to or through  Merrill  Lynch & Co.,  Merrill  Lynch,
Pierce, Fenner & Smith Incorporated and Goldman, Sachs & Co. (the "Agents"). The
Agents,  individually or in a syndicate, may purchase Notes, as principal,  from
the Company from time to time for resale to investors  and other  purchasers  at
varying  prices  relating to  prevailing  market prices at the time of resale as
determined by the applicable Agent or, if so specified in the applicable Pricing
Supplement,  for resale at a fixed offering  price.  If agreed to by the Company
and an Agent,  such Agent may also utilize its  reasonable  efforts on an agency
basis to solicit  offers to purchase the Notes at 100% of the  principal  amount
thereof,  unless otherwise specified in the applicable Pricing  Supplement.  The
Company  will pay a commission  to an Agent,  ranging from .125% to .750% of the
principal amount of each Note, depending upon its stated maturity,  sold through
such Agent as an agent of the Company.

      Unless otherwise specified in the applicable Pricing Supplement,  any Note
sold to an Agent as  principal  will be purchased by such Agent at a price equal
to 100% of the  principal  amount  thereof  less a percentage  of the  principal
amount  equal  to the  commission  applicable  to an  agency  sale  of a Note of
identical maturity. An Agent may sell Notes it has purchased from the Company as
principal to certain  dealers  less a concession  equal to all or any portion of
the discount  received in connection  with such purchase.  Such Agent may allow,
and such dealers may reallow,  a discount to certain  other  dealers.  After the
initial offering of Notes, the offering price (in the case of Notes to be resold
on a fixed offering price basis),  the  concession  and the  reallowance  may be
changed.

      The Company  reserves  the right to  withdraw,  cancel or modify the offer
made hereby  without  notice and may reject  offers in whole or in part (whether
placed directly with the Company or through an Agent).  Each Agent will have the
right, in its discretion reasonably exercised, to reject in whole or in part any
offer to purchase Notes received by it on an agency basis.

      Unless otherwise specified in the applicable Pricing  Supplement,  payment
of the  purchase  price of the Notes will be required to be made in  immediately
available funds in The City of New York on the date of settlement.

      Upon issuance,  the Notes will not have an established trading market. The
Notes will not be listed on any securities exchange. The Agents may from time to
time  purchase and sell Notes in the  secondary  market,  but the Agents are not
obligated to do so, and there can be no assurance that there will be a secondary
market for the Notes or that there will be liquidity in the secondary  market if
one develops.  From time to time, the Agents may make a market in the Notes, but
the Agents are not  obligated  to do so and may  discontinue  any  market-making
activity at any time.

      The Agents may be deemed to be  "underwriters"  within the  meaning of the
Securities  Act of 1933,  as amended  (the  "Securities  Act").  The Company has
agreed  to  indemnify  the  Agents  against   certain   liabilities   (including
liabilities  under the Securities  Act). The Company has agreed to reimburse the
Agents for certain other expenses.

      In the ordinary  course of their business, the Agents and their affiliates
have engaged and may in the future engage in investment and  commercial  banking
transactions with the Company and certain of its affiliates.



                                      S-8


<PAGE>

                 
PROSPECTUS
                                  $400,000,000

                                     [Logo]

                          FIRST COLLATERAL TRUST BONDS

                       PUBLIC SERVICE COMPANY OF COLORADO

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

      Public Service Company of Colorado (the  "Company")  intends to offer from
time  to  time  up to  $400,000,000  aggregate  principal  amount  of its  First
Collateral  Trust  Bonds in one or more  series of  medium-term  notes (the "New
Bonds"), on terms to be determined at the time or times of sale.

      For each  offering  of the New Bonds for which  this  Prospectus  is being
delivered,   there  will  be  an  accompanying  Prospectus  Supplement  (each  a
"Prospectus  Supplement") that will set forth where applicable,  with respect to
the New Bonds,  the series  designation,  the aggregate  principal amount of the
series,  the maturity  date or dates,  the  interest  rate or rates and times of
payment  of  interest,  the  provisions  for  redemption,   if  any,  and  other
provisions,  together with the initial  public  offering  price and the terms of
offering of such New Bonds.

      The New Bonds may be sold by the Company through  underwriters or dealers,
directly by the  Company or through  agents for  offering  pursuant to the terms
fixed at the time of sale. See "PLAN OF DISTRIBUTION" herein.

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

          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 November 7, 1996.



<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,  proxy  statements  and  other  information  with the
Securities  and Exchange  Commission  (the "SEC") and the New York,  Chicago and
Pacific Stock Exchanges.  Such reports,  proxy statements 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 the Chicago  Regional
Office, 14th Floor, 500 West Madison Street, Chicago,  Illinois.  Copies of this
material  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 or from the SEC's Web site at  "http://www.gov".
Certain of the  Company's  securities  are listed on the New York,  Chicago  and
Pacific Stock Exchanges and such reports, proxy statements and other information
can also be inspected and copied at the offices of the New York Stock  Exchange,
located on the 7th Floor, 20 Broad Street, New York, New York; the Chicago Stock
Exchange,  located  on the  12th  Floor,  440  South  LaSalle  Street,  Chicago,
Illinois;  and the  Pacific  Stock  Exchange,  located at 301 Pine  Street,  San
Francisco, California.

                 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.  Annual Report on Form 10-K for the year ended December 31, 1995.
     2.  Quarterly Report on Form 10-Q for the quarter ending March 31, 1996.
     3.  Quarterly Report on Form 10-Q for the quarter ending June 30, 1996.
     4.  Current Reports on Form 8-K dated January 18, 1996, January 31, 1996
         and May 21, 1996.

      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 hereof 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  incorporated  herein by
reference are sometimes  hereinafter  called the "Incorporated  Documents".  Any
statement  contained 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.

                                       2
<PAGE>

      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 Richard C. Kelly,  Senior Vice
President,  Finance, Treasurer and Chief Financial Officer, by mail at 1225 17th
Street,  Suite  900,  Denver,  Colorado  80202-5533,  or by  telephone  at (303)
571-7511.


                                  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,  together
with its subsidiaries,  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.

      The  Incorporated  Documents  contain  information  with  respect  to  the
proposed mergers of two wholly-owned  subsidiaries of New Century Energies, Inc.
("New  Century"),   a  newly  formed  holding  company,  into  the  Company  and
Southwestern  Public Service Company  ("SPS"),  respectively.  As a result,  New
Century  would  become the holding  company  for the  Company  and SPS,  but the
transaction  would not affect  the  outstanding  debt of the  Company or the New
Bonds offered hereby. The transaction would result in the common shareholders of
the Company owning approximately 62% of the common equity of New Century and the
common shareholders of SPS owning  approximately 38% of the common equity of New
Century.

      The  transaction is subject to customary  closing  conditions,  including,
without limitation,  the receipt of all necessary governmental approvals and the
making of all necessary governmental filings.  Furthermore, the merger agreement
may be terminated under certain circumstances, including, without limitation, by
mutual written consent of the Boards of Directors of the Company and SPS.

      Following the transaction, New Century will maintain its corporate offices
in Denver,  Colorado and significant  operating offices in Amarillo,  Texas. The
headquarters of the Company and SPS will remain in their current locations,  and
each of the Company and SPS will continue their existing utility operations.

                                       3

<PAGE>
<TABLE>
<CAPTION>

                       RATIO OF CONSOLIDATED EARNINGS TO
                          CONSOLIDATED FIXED CHARGES

                                  Twelve Months Ended             Six Months
                                     December 31,                Ended June 30,
<S>                      <C>    <C>     <C>     <C>    <C>           <C>

                         1991   1992    1993    1994   1995          1996
                         ----   ----    ----    ----   ----          ----
Ratio of consolidated    2.94   2.43    2.54    2.53   2.78          2.95
earnings to consolidated
fixed charges
</TABLE>

                            APPLICATION OF PROCEEDS

      Except  as  may  be  otherwise  provided  in  the  applicable   Prospectus
Supplement or any supplement thereto,  the net proceeds from the sale of the New
Bonds  will be used to  refinance  matured or  maturing  debt  incurred  to fund
defueling expenses of the Company's Fort St. Vrain Nuclear  Generating  Station,
to fund the  Company's  construction  program  and for other  general  corporate
purposes.

                          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 in this Prospectus 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 "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".

                                       4
<PAGE>

      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,  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 depositary for such global New Bonds;  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 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
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 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 due 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 

                                       5
<PAGE>

at  its  discretion.  (See  Section  602  and  Article  1  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 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.

                                       6
<PAGE>


     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 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.

                                       7
<PAGE>

      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

                                       8
<PAGE>

than by  application  of the  proceeds  of a payment  in respect of such Class A
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 an existing mortgage has merged into or
consolidated  with the  Company,  or a  corporation  has  conveyed or  otherwise
transferred  property to the Company subject to the lien of an existing mortgage
and the  Company has assumed all the  obligations  of the  mortgagor  under such
existing mortgage,  and in either case such existing 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".)

                                       9
<PAGE>

      Lien of the 1993 Mortgage.  In the opinion of counsel for the Company (see
"EXPERTS")  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 the 1939 Mortgage is in
effect,  the New 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 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,
among  other  things,  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 all 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;  all 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;  all  furniture  and  furnishings;
computers,  machinery and telecommunication and other equipment used exclusively
for corporate administrative

                                       10
<PAGE>


or clerical purposes; coal, ore, gas, oil and other minerals and timber, and all
rights  and  interests  in any such  minerals  or  timber,  whether  or not such
minerals or timber have been mined or extracted 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 all  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 or in connection with 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.

      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;

                                       11
<PAGE>

(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

                                       12
<PAGE>

Class A Bonds  or (ii) as  provided  in (c)  above.  In  general,  the  interest
requirement  with 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 canceled by the 1993 Mortgage Trustee);

                                       13
<PAGE>

(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  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.)

                                       14
<PAGE>

     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.)

                                       15
<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

                                       16
<PAGE>

(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,  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,

                                       17
<PAGE>
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 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 such 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

                                       18
<PAGE>
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 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.)

                                       19
<PAGE>
     Events of Default:  Each of the following  events  constitutes  an Event of
Default under the 1993 Mortgage:

(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.)

                                       20
<PAGE>
      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

             (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
                                       21
<PAGE>
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  may  require  adequate
indemnity  against costs,  expenses and liabilities to be incurred in connection
therewith. (See Sections 1011 and 1101.)

                                       22
<PAGE>
      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 monies 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,  depositary  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.
  
                                     23
<PAGE>

      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 trustee will become effective until the acceptance of
appointment by a successor  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  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 trustee in accordance  with
the 1993 Mortgage. (See Section 1110.)

      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, a copy of which
is filed as an exhibit to the Registration Statement of which this Prospectus is
a part.  Capitalized  terms  used  under this  heading  which are not  otherwise
defined in this Prospectus 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 articles  and section  numbers of the
Original 1939 Mortgage.

                                       24
<PAGE>

      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  counsel  for  the  Company  (see  "EXPERTS"),   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  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".

                                       25
<PAGE>

      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 March 31, 1996, and
the amount of retired bonds as of September  30, 1996,  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 $373,263,821 and $968,180,000,
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  September  30,  1996,  $1,144,917,000  in
aggregate  principal amount of bonds were  outstanding  under the 1939 Mortgage,
$472,167,000 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 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".

                                       26
<PAGE>

      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 of 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 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.

                                       27
<PAGE>

      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   have  been  acquired  or
            constructed within five years;

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

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

                                       28
<PAGE>

                  (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

                                       29
<PAGE>

            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";

                  (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 NEW
      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

                                       30
<PAGE>

Mortgage Securities) aggregating  $433,500,000 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  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.)

                                       31
<PAGE>

      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.

                                LEGAL OPINIONS

      The  validity  of the New Bonds  will be passed  upon for the  Company  by
LeBoeuf,  Lamb,  Greene,  &  MacRae,  L.L.P.,  a limited  liability  partnership
including professional corporations, Denver, Colorado and New York, New York and
for any underwriters, agents or dealers by Brown & Wood LLP, New York, New York.
All legal  matters  pertaining  to titles and the  respective  liens of the 1993
Mortgage  and the 1939  Mortgage  will be  passed  upon only by  LeBoeuf,  Lamb,
Greene, & MacRae, L.L.P. In giving its opinion,  Brown & Wood LLP may rely as to
all matters of Colorado law upon the opinion of LeBoeuf, Lamb, Greene, & MacRae,
L.L.P.

                                    EXPERTS

      Reference  is made to the  Incorporated  Documents  for  specification  of
certain  information  incorporated  herein by  reference  upon the  authority of
experts.  In addition,  the statements  made in "DESCRIPTION OF THE NEW BONDS --
Security" and "DESCRIPTION OF THE 1939 MORTGAGE",  insofar as they are, or refer
to,  statements of law or legal  conclusions,  have been prepared or reviewed by
LeBoeuf,  Lamb,  Greene,  &  MacRae,  L.L.P.,  a limited  liability  partnership
including professional corporations,  counsel for the Company, and have been set
forth herein on the authority of said firm as experts.

                             PLAN OF DISTRIBUTION

      The  Company may sell each type and series of New Bonds as  applicable  in
any of three ways: (i) directly to a limited number of institutional  purchasers
or to a single purchaser,  (ii) through agents or (iii) through  underwriters or
dealers. The Prospectus

                                       32
<PAGE>

Supplement  relating to each series of New Bonds will set forth the terms of the
offering  of such New  Bonds,  including  the name or names of any such  agents,
underwriters  or  dealers;  the  purchase  price of such New  Bonds  and the net
proceeds to the Company from such sale;  any  underwriting  discounts  and other
items  constituting  underwriters'  compensation;  the initial  public  offering
price; and any discounts or concessions allowed or reallowed or paid to dealers.
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 of a series of New Bonds,  such New
Bonds 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.  Unless  otherwise set forth in the  Prospectus  Supplement
relating  to a series  of New  Bonds,  the  obligations  of any  underwriter  or
underwriters  to purchase  such New Bonds will be subject to certain  conditions
precedent and such underwriter or underwriters will be obligated to purchase all
of such New Bonds if any are purchased,  except that, in certain cases involving
a default  by one or more  underwriters,  less than all of such New Bonds may be
purchased.

      If an agent of the  Company  is used in any sale of a series of New Bonds,
any  commission  payable  by the  Company to such agent will be set forth in the
Prospectus  Supplement  relating to such series of New Bonds.  Unless  otherwise
indicated in the Prospectus Supplement,  any such agent will be acting on a best
efforts basis for the period of its appointment.

      Any underwriters,  dealers or agents  participating in the distribution of
the New Bonds may be deemed to be underwriters,  and any discount or commissions
received  by them  on the  sale or  resale  of New  Bonds  may be  deemed  to be
underwriting  discounts and  commissions,  under the  Securities Act of 1933, as
amended (the "1933 Act"). Agents, underwriters and dealers may be entitled under
agreements  entered  into with the  Company to  indemnification  by the  Company
against certain liabilities, including liabilities under the 1933 Act.


                                      33

<PAGE>


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


   No dealer, salesperson or other
individual has been  authorized to
give  any  information  or to make
any  representations   other  than
contained  or incorporated by ref-
erence in  this Prospectus Supple-
ment,   the   applicable   Pricing
Supplement  or  the  Prospectus in                    $250,000,000
connection with  the offer made by
this  Prospectus  Supplement,  the
applicable  Pricing Supplement and
the  Prospectus  and,  if given or
made,  such  information or repre-                        LOGO
sentations must not be relied upon
as  having been authorized by  the
Company  or  the  Agents.  Neither
the  delivery of  this  Prospectus
Supplement, the applicable Pricing               PUBLIC SERVICE COMPANY
Supplement or  the  Prospectus nor                     OF COLORADO
any sale made hereunder and there-
under shall under any circumstance
create  an implication  that there
has  not  been  any  change in the 
affairs of the  Company since  the
date hereof. This Prospectus Supp-
lement,  the  applicable   Pricing
Supplement  and the  Prospectus do
not constitute an offer or solici-
tation  by  anyone  in  any juris-
diction  in  which  such  offer or
solicitation  is not authorized or
in  which  the person  making such
offer is not qualified to do so or
to  anyone  to whom it is unlawful
to make such offer or solicitation.        Secured Medium-Term Notes, Series B
                                          Due From Nine Months To Thirty Years
         ---------------                            From Date of Issue

        TABLE OF CONTENTS

                               Page

      Prospectus Supplement                        ----------------
                                                PROSPECTUS SUPPLEMENT
Supplemental Description of                        ----------------
 the Notes....................  S-2
Plan of Distribution..........  S-8

           Prospectus

Available Information.........    2
Incorporation of Certain
 Documents By Reference.......    2               Merrill Lynch & Co.
The Company...................    3               Goldman, Sachs & Co.
Ratio of Consolidated Earnings
 to Consolidated Fixed Charges.   4
Application of Proceeds........   4
Description of the New Bonds...   4
Description of the 1939 Mortgage.24
Legal Opinions................   32                November 7, 1996
Experts.......................   32
Plan of Distribution..........   32


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