Exhibit 1



                      PUBLIC SERVICE COMPANY OF COLORADO
                           (a Colorado corporation)

                      Secured Medium-Term Notes, Series B
            Due From Nine Months to Thirty Years from Date of Issue


                            DISTRIBUTION AGREEMENT





                                          [DATE]


MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated
World Financial Center
10th Floor, North Tower
New York, New York  10281-1310

GOLDMAN, SACHS & CO.
85 Broad Street
New York, New York  10004


Dear Sirs:

      Public  Service  Company  of  Colorado,   a  Colorado   corporation   (the
"Company"),  confirms its  agreement  with Merrill Lynch & Co.,  Merrill  Lynch,
Pierce,  Fenner & Smith Incorporated and Goldman,  Sachs & Co. (each an "Agent";
collectively, the "Agents") with respect to the issue and sale by the Company of
its  Secured  Medium-Term  Notes,  Series B (being a series of First  Collateral
Trust  Bonds)  (the  "Notes").  The Notes are to be issued  under the  Company's
Indenture  dated as of October 1, 1993,  as heretofore  supplemented  by various
supplemental indentures, including a supplemental indenture dated as of November
1, 1996, to First Trust of New York, National Association, as successor trustee






(the "Trustee") to Morgan Guaranty Trust Company of New York (formerly  Guaranty
Trust  Company  of  New  York).  Said  Indenture  as so  supplemented  and to be
supplemented  is  hereinafter  called  the  "Indenture"  and  such  supplemental
indenture dated as of November 1, 1996 is hereinafter  called the  "Supplemental
Indenture".  As of the date hereof,  the Company has authorized the issuance and
sale of up to $250,000,000 aggregate principal amount of Notes to or through the
Agents pursuant to the terms of this Agreement.

      This  Agreement  provides both for the sale of Notes by the Company to one
or more Agents as principal for resale to investors and other purchasers and for
the sale of Notes by the Company directly to investors (as may from time to time
be specified  by the Company and agreed to by the  applicable  Agent),  in which
case such Agent will act as an agent of the Company in  soliciting  purchases of
the Notes.  The Company  may also sell Notes  directly  to  investors  and other
investors on its own behalf and not through an Agent acting as agent.

      The Company has filed with the  Securities  and Exchange  Commission  (the
"SEC") a registration  statement on Form S-3 (No. 333-[ ]) for the  registration
of First Collateral Trust Bonds,  including the Notes,  under the Securities Act
of  1933  (the  "1933  Act")  and  the  offering  thereof  from  time to time in
accordance  with Rule 415 of the rules and regulations of the SEC under the 1933
Act (the "1933 Act Regulations"). Such registration statement, [as amended], was
declared  effective by the SEC at [ ], Eastern  Standard Time, on [ ] (the later
of such  time and date or the time  and  date of the  filing  thereafter  of the
Company's  most  recent  Annual  Report  on  Form  10-K  (a  "10-K  Report")  is
hereinafter  called the "Effective Date"). The Indenture has been duly qualified
under the Trust  Indenture  Act of 1939,  as  amended  (the  "1939  Act").  Such
registration  statement and the prospectus  constituting a part thereof, and any
prospectus  supplement and pricing supplement  relating to the Notes,  including
all documents incorporated therein by reference, as from time to time amended or
supplemented by the filing of documents pursuant to the Securities  Exchange Act
of 1934, as amended (the "1934 Act"), or the 1933 Act or otherwise, are referred
to herein as the "Registration  Statement" and the  "Prospectus",  respectively,
except  that if any  revised  prospectus  shall be provided to the Agents by the
Company for use in  connection  with the  offering of the Notes,  whether or not
such revised  prospectus is required to be filed by the Company pursuant to Rule
424(b) of the 1933 Act Regulations,  the term  "Prospectus"  shall refer to such
revised  prospectus  from and after the time it is first  provided to the Agents
for such use.




                                    -2-






SECTION 1.  Appointment as Agents.

      (a)  Appointment  of Agents.  Subject to the terms and  conditions  stated
herein,  the  Company  hereby  agrees  that Notes will be sold to or through the
Agents,  except that the Company reserves the right to sell the Notes on its own
behalf directly to investors in those jurisdictions where it is authorized to do
so and,  from time to time,  to  appoint  additional  agents to sell the  Notes,
provided  that the Company  shall  furnish the Agents  with  reasonable  advance
notification  of the  appointment of any additional  agent to sell the Notes and
provided  further  that such  additional  agents  shall be  required  to execute
distribution  agreements  in form and  substance  substantially  similar to this
Agreement.

      (b) Sale of Notes.  The Company shall not sell or approve the solicitation
of purchases of Notes in excess of the amount which shall be  authorized  by the
Company  from  time to time or in excess of the  aggregate  principal  amount of
Notes registered pursuant to the Registration  Statement.  The Agents shall have
no  responsibility  for  maintaining  records  with  respect  to  the  aggregate
principal  amount of Notes sold, or of otherwise  monitoring the availability of
Notes for sale, under the Registration Statement.

      (c)  Purchases as Principal.  The Agents shall not have any  obligation to
purchase  Notes from the Company as principal,  but one or more Agents may agree
from time to time to purchase  Notes as principal  for resale to  investors  and
other purchasers  determined by such Agent or Agents. Any such purchase of Notes
by an Agent as principal shall be made in accordance with Section 3(a) hereof.

      (d)  Solicitations  as Agent. If requested by the Company and agreed to by
an  Agent,  such  Agent,  acting  solely  as agent  for the  Company  and not as
principal,  will solicit  purchases of the Notes. Such Agent will communicate to
the Company,  orally,  each offer to purchase Notes solicited by it on an agency
basis, other than those offers rejected by such Agent. Such Agent shall have the
right, in its discretion reasonably  exercised,  to reject any proposed purchase
of Notes,  as a whole or in part, and any such  rejection  shall not be deemed a
breach of its agreement  contained herein.  The Company may accept or reject any
proposed  purchase  of  Notes,  in whole  or in  part.  Such  Agent  shall  make
reasonable  efforts  to assist  the  Company in  obtaining  performance  by each
purchaser whose offer to purchase Notes has been solicited by it and accepted by
the Company. Such Agent shall not have any liability to the Company in the event
that any such purchase is not consummated  for any reason.  If the Company shall
default on its  obligation  to deliver  Notes to a purchaser  whose offer it has
accepted, the Company shall (i) hold such Agent harmless against any loss, claim
or damage  arising  from or as a result of such  default by the Company and (ii)
pay to such Agent any commission to which it would  otherwise be entitled absent
such default.

                                    -3-







      (e) Reliance. The Company and the Agents agree that any Notes purchased by
one or more Agents as principal shall be purchased,  and any Notes the placement
of which an Agent arranges as agent shall be placed by such Agent in reliance on
the  representations,  warranties,  covenants  and  agreements  of  the  Company
contained  herein and on the terms and  conditions  and in the  manner  provided
herein.




SECTION 2.  Representations and Warranties.

      (a) The  Company  represents  and  warrants  to each  Agent as of the date
hereof,  as of the date of each  acceptance  by the  Company of an offer for the
purchase of Notes  (whether to such Agent as  principal or through such Agent as
agent),  as of the date of each  delivery  of Notes  (whether  to such  Agent as
principal or through such Agent as agent) (the date of each such  delivery to an
Agent as principal being hereafter  referred to as a "Settlement  Date"), and as
of the times  referred to in Section 7(a) hereof  (each of the times  referenced
above being referred to hereafter as a "Representation Date"), as follows:

              (i) Registration Statement and Prospectus.  At the Effective Date,
      the  Registration  Statement  and the  Indenture  complied,  and as of the
      applicable  Representation Date will comply, in all material respects with
      the requirements of the 1933 Act and the 1933 Act Regulations and the 1939
      Act and the rules and regulations of the SEC promulgated  thereunder.  The
      Registration  Statement,  at the Effective Date, did not, and at each time
      thereafter at which any amendment to the  Registration  Statement  becomes
      effective and as of the applicable  Representation Date, will not, contain
      an untrue  statement of a material  fact or omit to state a material  fact
      required to be stated therein or necessary to make the statements  therein
      not misleading.  The Prospectus, as of the date hereof does not, and as of
      the applicable  Representation  Date will not, include an untrue statement
      of a material fact or omit to state a material fact  necessary in order to
      make the statements therein, in the light of the circumstances under which
      they   were   made,   not   misleading;   provided,   however,   that  the
      representations  and  warranties  in this  subsection  shall  not apply to
      statements in or omissions from the  Registration  Statement or Prospectus
      made in reliance upon and in conformity with information  furnished to the
      Company in writing by the  Agents  expressly  for use in the  Registration
      Statement  or  Prospectus  or to that part of the  Registration  Statement
      which  constitutes the Trustee's  Statement of Eligibility  under the 1939
      Act (Form T-1).



                                    -4-






             (ii)  Incorporated   Documents.   The  documents   incorporated  by
      reference  into the  Prospectus,  at the time they were or  hereafter  are
      filed with the SEC, complied or when so filed will comply, as the case may
      be, in all material respects with the requirements of the 1934 Act and the
      rules and regulations of the SEC thereunder (the "1934 Act  Regulations"),
      and, when read together and with the other  information in the Prospectus,
      did not and will not  contain an untrue  statement  of a material  fact or
      omit to state a material fact  required to be stated  therein or necessary
      in order to make the statements therein, in the light of the circumstances
      under which they were or are made, not misleading.

            (iii)  Accountants.  The  accountants  who  certified  the financial
      statements and supporting  schedules included or incorporated by reference
      in the  Registration  Statement and the Prospectus are independent  public
      accountants as required by the 1933 Act and the 1933 Act Regulations.

             (iv)  Financial  Statements.   The  financial  statements  and  any
      supporting  schedules  of the  Company and its  consolidated  subsidiaries
      included or  incorporated by reference in the  Registration  Statement and
      the Prospectus  present fairly the consolidated  financial position of the
      Company and its  consolidated  subsidiaries  as at the dates indicated and
      the  results of their  operations  for the  periods  specified;  except as
      otherwise stated therein,  said financial statements have been prepared in
      conformity  with generally  accepted  accounting  principles  applied on a
      consistent basis; and the supporting schedules included or incorporated by
      reference in the Registration  Statement and the Prospectus present fairly
      the information required to be stated therein.

              (v)  Material   Changes  or  Material   Transactions.   Since  the
      respective  dates as of  which  information  is given in the  Registration
      Statement  and the  Prospectus,  except as  otherwise  stated  therein  or
      contemplated thereby, (A) there has been no material adverse change in the
      business,  property or condition,  financial or otherwise,  of the Company
      and its subsidiaries considered as one enterprise,  whether or not arising
      in  the  ordinary  course  of  business,   and  (B)  there  have  been  no
      transactions entered into by the Company or any of its subsidiaries, other
      than those in the  ordinary  course of  business,  which are  material  in
      relation to the Company and its subsidiaries considered as one enterprise;
      and, except as so stated or  contemplated,  neither the Company nor any of
      its subsidiaries has any contingent  obligations which are material to the
      Company and its subsidiaries considered as one enterprise.



                                    -5-






            (vi) Due Incorporation and Qualification.  The Company has been duly
      incorporated  and is validly  existing as a  corporation  in good standing
      under the laws of the State of Colorado with corporate power and authority
      to own,  lease and operate its  properties  and to conduct its business as
      described in the Prospectus and the Company is duly qualified as a foreign
      corporation  to  transact  business  and  is  in  good  standing  in  each
      jurisdiction in which such qualification is required, whether by reason of
      the  ownership or leasing of property or the conduct of  business,  except
      where the  failure to so qualify or be in good  standing  would not have a
      material adverse effect on the business, property or condition,  financial
      or  otherwise,  of the  Company  and its  subsidiaries  considered  as one
      enterprise.

            (vii)  Authorization  and Validity of this Agreement,  the Indenture
      and the Notes. This Agreement has been duly and validly  authorized by the
      Company and, upon  execution and delivery by the Agents and subject to any
      principles   of  public   policy   limiting   the  right  to  enforce  the
      indemnification  provisions  contained herein, will be a valid and binding
      agreement of the Company;  the  Indenture and the  Supplemental  Indenture
      have  each been duly and  validly  authorized  by the  Company  and,  upon
      execution and delivery of the Supplemental  Indenture by the Trustee,  the
      Indenture  (including  the  Supplemental  Indenture)  will be a valid  and
      binding mortgage of the Company  enforceable in accordance with its terms,
      except as  enforcement  thereof may be limited by laws and  principles  of
      equity  affecting  generally  the  enforcement  of  mortgagees'  and other
      creditors' rights, including without limitation, bankruptcy and insolvency
      laws and state  laws  which  affect the  enforcement  of certain  remedial
      provisions of the  Indenture;  the issuance and sale by the Company of the
      Notes  pursuant  to  this  Agreement  have  been  duly  authorized  by all
      necessary  corporate action and, when issued,  authenticated and delivered
      by the  Company  pursuant  to this  Agreement  and the  Indenture  against
      payment of the consideration therefor, the Notes will be valid and binding
      obligations of the Company,  enforceable  in accordance  with their terms,
      except as  enforcement  thereof may be limited by laws and  principles  of
      equity  affecting  generally  the  enforcement  of  mortgagees'  and other
      creditors' rights, including without limitation, bankruptcy and insolvency
      laws and state  laws  which  affect the  enforcement  of certain  remedial
      provisions  of the  Indenture;  and the  Notes and the  Indenture  will be
      substantially  in the form heretofore  delivered to the Agents and conform
      in all material  respects to all statements  relating thereto contained in
      the  Prospectus;  and the  Notes  will be  entitled  to the  benefits  and
      security of the Indenture, and will be secured equally and ratably (except
      to the extent that any sinking,  amortization,  improvement  or other fund
      may afford

                                    -6-






      additional security for the bonds of any particular series) with all other
      bonds outstanding under the Indenture.

            (viii)  Class A Bonds.  The  issuance and delivery by the Company of
      the Class A Bonds (as  defined in the  Indenture)  to be made the basis of
      the  authentication  and  delivery of the Notes (the "Class A Bonds") have
      been duly authorized by all necessary  corporate action;  and when (i) the
      Class A Bonds have been issued, authenticated and delivered to the Trustee
      pursuant  to  the   Indenture   and  (ii)  the  Notes  have  been  issued,
      authenticated  and delivered to the Purchasers  pursuant to this Agreement
      against payment of the consideration  therefor specified herein, the Class
      A Bonds will be valid and binding obligations of the Company,  enforceable
      in  accordance  with their  terms,  except as  enforcement  thereof may be
      limited  by  laws  and  principles  of  equity  affecting   generally  the
      enforcement of mortgagees' and other creditors' rights,  including without
      limitation  bankruptcy and insolvency laws and state laws which affect the
      enforcement of certain  remedial  provisions of the PSCO 1939 Mortgage (as
      defined in the  Indenture),  and will be entitled  to the  benefits of the
      PSCO 1939 Mortgage.

            (ix) No Defaults.  The Company is not in violation of its charter or
      by-laws or in default in the  performance  or  observance  of any material
      obligation,  agreement,  covenant or condition  contained in any contract,
      indenture,  mortgage,  loan agreement,  note, lease or other instrument to
      which it is a party or by which it or any of them or their  properties may
      be bound or any law, administrative  regulation or administrative or court
      order or  decree  except  to the  extent  set  forth  in the  Registration
      Statement and the  Prospectus or except to the extent that such  violation
      or  default  would not have a  material  adverse  effect on the  business,
      property or  condition,  financial  or  otherwise,  of the Company and its
      subsidiaries considered as one enterprise;  and the execution and delivery
      of this Agreement and the  Supplemental  Indenture,  the incurrence of the
      obligations  herein  set forth and the  consummation  of the  transactions
      contemplated  herein and therein  will not conflict  with or  constitute a
      breach of, or default  under or (other  than under the  Indenture  and the
      PSCO 1939 Mortgage with respect to the Notes and the Class A Bonds) result
      in the creation or imposition of any lien,  charge or encumbrance upon any
      property or assets of the Company pursuant to any contract,  lease,  note,
      mortgage,  indenture,  loan  agreement  or other  instrument  to which the
      Company  is a party or by  which  it may be  bound or to which  any of the
      property or assets of the Company is subject,  nor will such action result
      in any  violation  of the  provisions  of the  charter  or  by-laws of the
      Company or any law,  administrative  regulation or administrative or court
      order or decree.


                                    -7-






            (x) Legal Proceedings;  Contracts. Except as may be set forth in the
      Registration  Statement and the  Prospectus,  there is no action,  suit or
      proceeding before or by any court or governmental agency or body, domestic
      or foreign, now pending,  or, to the knowledge of the Company,  threatened
      against or affecting, the Company or any of its subsidiaries,  which would
      result  in any  material  adverse  change  in the  business,  property  or
      condition,  financial or  otherwise,  of the Company and its  subsidiaries
      considered  as one  enterprise,  or which would  materially  and adversely
      affect the  consummation of this Agreement;  and there are no contracts or
      documents of the Company or any of its subsidiaries  which are required to
      be filed as exhibits to the  Registration  Statement by the 1933 Act or by
      the 1933 Act Regulations which have not been so filed.

            (xi) Authorization, Approval and Consent. The Company has filed with
      The Public  Utilities  Commission of the State of Colorado (the  "Colorado
      Commission")  an  application  with  respect to, among other  things,  the
      issuance and sale of the Company's debt  securities,  including the Notes,
      and the Colorado Commission has issued its order authorizing and approving
      such issuance and sale.  If the  above-mentioned  order  continues in full
      force and effect, no further consent,  order or authorization of or decree
      or approval by the Colorado  Commission or any other court or governmental
      or  regulatory  authority  or body is  necessary  in  connection  with the
      consummation  by the  Company  of the  transactions  contemplated  by this
      Agreement or the issuance and sale by the Company of the Notes pursuant to
      this  Agreement,  except that there must be compliance with the securities
      laws in the jurisdictions in which the Notes are to be offered and sold.

            (xii) Ratings.  The medium-term  note program  pursuant to which the
      Notes are being issued (the  "Program") as well as the Notes are rated [ ]
      by Standard & Poor's Ratings Service and [ ] by Moody's Investors Service,
      Inc.,  or such  other  rating  as to which  the  Company  shall  have most
      recently notified the Agents pursuant to Section 4(a) hereof.

            (xiii)  Subsidiaries.  Each  subsidiary  of the  Company  which is a
      significant subsidiary (each, a "Significant  Subsidiary"),  as defined in
      Rule  405 of  Regulation  C of the  1933 Act  Regulations,  has been  duly
      incorporated  and is validly  existing as a  corporation  in good standing
      under the laws of the  jurisdiction  of its  incorporation,  has corporate
      power and  authority  to own,  lease and  operate  its  properties  and to
      conduct its business as described in the Prospectus, and is duly qualified
      as a foreign  corporation to transact  business and is in good standing in
      each  jurisdiction  in which such  qualification  is required,  whether by
      reason of the ownership or leasing of property or the conduct of

                                    -8-






      business,  except  where the failure to so qualify or be in good  standing
      would not have a material  adverse  effect on the  business,  property  or
      condition,  financial or  otherwise,  of the Company and its  subsidiaries
      considered as one enterprise;  all of the issued and  outstanding  capital
      stock of each Significant  Subsidiary has been duly and validly issued and
      is fully paid and  non-assessable;  and all of the  capital  stock of each
      Significant   Subsidiary  owned  by  the  Company,   directly  or  through
      subsidiaries,  is owned free and clear of any security interest, mortgage,
      pledge,  lien,  encumbrance,  claim or  equity  except  that the  stock of
      certain of such subsidiaries is pledged under the PSCO 1939 Mortgage.

      (b) Additional  Certifications.  Any certificate  signed by any officer of
the Company and  delivered to one or more Agents or to counsel for the Agents in
connection  with an  offering  of Notes to one or more  Agents as  principal  or
through an Agent as agent shall be deemed a  representation  and warranty by the
Company to such Agent or Agents as to the matters covered thereby on the date of
such certificate.


SECTION 3.  Purchases as Principals; Solicitations as Agents.

      (a) Purchases as Principals. Unless otherwise specified by the Company and
agreed  to by an  Agent,  Notes  shall be  purchased  by one or more  Agents  as
principal in  accordance  with terms agreed upon by such Agent or Agents and the
Company (which terms, unless otherwise agreed,  shall, to the extent applicable,
include  those terms  specified  in Exhibit A hereto and be agreed upon  orally,
with written confirmation prepared by such Agent or Agents and facsimiled to the
Company).  An Agent's  commitment to purchase Notes as principal shall be deemed
to have been  made on the basis of the  representations  and  warranties  of the
Company herein contained and shall be subject to the terms and conditions herein
set forth.  Unless the context  otherwise  requires,  references herein to "this
Agreement"  shall include the agreement of one or more Agents to purchase  Notes
from the Company as principal.  Each purchase of Notes, unless otherwise agreed,
shall be at a discount from the principal amount of each such Note equivalent to
the applicable  commission set forth in Schedule A hereto. The Agents may engage
the services of any other broker or dealer in connection  with the resale of the
Notes  purchased  by them as  principal  and may allow all or any portion of the
discount  received in connection  with such  purchases  from the Company to such
brokers and dealers. At the time of each purchase of Notes by one or more Agents
as  principal,  such Agent or Agents  shall  specify  the  requirements  for the
stand-off  agreement,  officers'  certificate,  opinions  of counsel and comfort
letter pursuant to Sections 4(l), 7(a), 7(b) and 7(c) hereof.

     (b)  Solicitations  as  Agents.  On the  basis of the  representations  and
warranties herein contained, but subject to

                                    -9-






the terms and  conditions  herein set forth,  when  agreed by the Company and an
Agent, such Agent, as an agent of the Company,  will use its reasonable  efforts
to solicit  offers to purchase the Notes upon the terms and conditions set forth
herein  and  in the  Prospectus.  The  Agents  are  not  authorized  to  appoint
sub-agents  with  respect to Notes sold  through  them as agent.  All Notes sold
through an Agent as agent will be sold at 100% of their principal  amount unless
otherwise agreed to by the Company and such Agent.

      The  Company  reserves  the  right,  in its sole  discretion,  to  suspend
solicitation  of offers to purchase  the Notes  through  the Agents,  as agents,
commencing  at any  time  for any  period  of time  or  permanently.  As soon as
practicable  after  receipt of  instructions  from the Company,  the Agents will
suspend solicitation of offers to purchase the Notes from the Company until such
time as the  Company  has  advised  the  Agents  that such  solicitation  may be
resumed.

      The  Company  agrees  to pay  each  Agent a  commission,  in the form of a
discount,  equal to the  applicable  percentage of the principal  amount of each
Note sold by the Company as a result of a solicitation made by such Agent as set
forth in Schedule A hereto.

      (c)  Administrative  Procedures.  The  purchase  price,  interest  rate or
formula, maturity date and other terms of the Notes (as applicable) specified in
Exhibit A hereto shall be agreed upon by the Company and the applicable Agent or
Agents and specified in a pricing supplement to the Prospectus (each, a "Pricing
Supplement") to be prepared in connection with each sale of Notes. Except as may
be otherwise specified in the applicable Pricing  Supplement,  the Notes will be
issued  in  denominations  of U.S.  $100,000  or any  larger  amount  that is an
integral multiple of U.S. $1,000.  Administrative procedures with respect to the
sale of Notes shall be agreed upon from time to time by the Agents,  the Company
and the Trustee (the "Procedures"). The Agents and the Company agree to perform,
and the  Company  agrees  to  cause  the  Trustee  to agree  to  perform,  their
respective duties and obligations  specifically provided to be performed by them
in the Procedures.


SECTION 4.  Covenants of the Company.

      The Company covenants with each Agent as follows:

      (a)  Notice  of  Certain  Events.  The  Company  will  notify  the  Agents
immediately,  and confirm the notice in writing, (i) of the effectiveness of any
amendment to the Registration Statement,  (ii) of the transmittal to the SEC for
filing of any amendment or  supplement  to the  Prospectus or any document to be
filed  pursuant to the 1934 Act which will be  incorporated  by reference in the
Prospectus,  (iii) of the receipt of any  comments  from the SEC with respect to
the Registration Statement or the Prospectus,

                                    -10-






(iv) of any request by the SEC for any amendment to the  Registration  Statement
or any amendment or supplement to the Prospectus or for additional  information,
and  (v)  of  the  issuance  by  the  SEC  of  any  stop  order  suspending  the
effectiveness of the Registration Statement or the initiation of any proceedings
for that purpose.  The Company will make every reasonable  effort to prevent the
issuance  of any stop  order and,  if any stop  order is  issued,  to obtain the
lifting thereof at the earliest possible moment.  In addition,  the Company will
notify  the  Agents  if  the  rating  assigned  by  any  nationally   recognized
statistical  rating  organization  to the Program or any debt  securities of the
Company shall have been changed,  or if any such rating  organization shall have
publicly  announced  that it has under  surveillance  or review,  with  possible
negative  implications,  its rating of the Program or any debt securities of the
Company or shall have withdrawn the rating of the Program or any debt securities
of the Company, promptly after learning of any such event.

      (b) Notice of Certain Proposed  Filings.  Except as otherwise  provided in
subsection  (j) of this  Section 4, the  Company  will give the  Agents  advance
notice of its intention to file or prepare any additional registration statement
with respect to the  registration  of  additional  Notes,  any  amendment to the
Registration  Statement or any amendment or supplement to the Prospectus  (other
than a Pricing  Supplement),  whether by the filing of documents pursuant to the
1934 Act, the 1933 Act or  otherwise,  and will furnish to the Agents  copies of
any such amendment or supplement or other documents a reasonable time in advance
of such filing or use.

      (c) Copies of the Registration  Statement and the Prospectus.  The Company
will  deliver to each Agent one (1) signed and as many  conformed  copies of the
Registration  Statement  (as  originally  filed) and of each  amendment  thereto
(including  exhibits filed therewith or  incorporated  by reference  therein and
documents  incorporated  by  reference  in the  Prospectus)  as the  Agents  may
reasonably request. The Company will furnish to the Agents as many copies of the
Prospectus (as amended or supplemented)  as the Agents shall reasonably  request
so long as the Agents are required to deliver a Prospectus  in  connection  with
sales or solicitations of offers to purchase the Notes.

      (d)  Revisions  of  Prospectus  -- Material  Changes.  Except as otherwise
provided  in  subsection  (j) of this  Section  4, if any event  shall  occur or
condition exist as a result of which it is necessary,  in the opinion of counsel
for the Agents or counsel for the Company,  to further amend or  supplement  the
Prospectus in order that the Prospectus will not include an untrue  statement of
a material  fact or omit to state any material  fact  necessary in order to make
the statements therein not misleading in the light of the circumstances existing
at the time it is delivered to a purchaser,  or if it shall be necessary, in the
opinion  of  either  such  counsel,  to amend  or  supplement  the  Registration
Statement or the Prospectus in order to comply with the requirements of the

                                    -11-






1933 Act or the 1933 Act Regulations,  the Company shall give immediate  notice,
confirmed  in  writing,  to the  Agents to cease the  solicitation  of offers to
purchase  the Notes in their  capacity as agents and to cease sales of any Notes
the Agents may then own as principals, and the Company will promptly prepare and
file with the SEC such  amendment  or  supplement,  whether by filing  documents
pursuant to the 1934 Act,  the 1933 Act or  otherwise,  as may be  necessary  to
correct such untrue statement or omission or to make the Registration  Statement
and Prospectus comply with such requirements.

      (e)  Periodic  Financial  Information.  Except as  otherwise  provided  in
subsection  (j) of this  Section 4, on the date on which there shall be released
to the general public interim  financial  statement  information  related to the
Company with  respect to each of the first three  quarters of any fiscal year or
preliminary financial statement information with respect to any fiscal year, the
Company shall furnish such information to the Agents, confirmed in writing.

      (f)  Prospectus  Revisions  -- Audited  Financial  Information.  Except as
otherwise provided in subsection (j) of this Section, on the date on which there
shall be released to the general  public  financial  information  included in or
derived from the audited  financial  statements of the Company for the preceding
fiscal year, the Company shall furnish such information to the Agents, confirmed
in writing.

      (g) Earnings Statements.  The Company will make generally available to its
security  holders as soon as  practicable,  but not later than 90 days after the
close of the period covered  thereby,  an earnings  statement (in form complying
with the  provisions  of Rule 158 under the 1933 Act) covering each twelve month
period  beginning,  in each case,  not later than the first day of the Company's
fiscal quarter next following the "effective date" (as defined in such Rule 158)
of the Registration Statement with respect to each sale of Notes.

      (h) Blue Sky  Qualifications.  The Company will  endeavor,  in cooperation
with the Agents, to qualify the Notes for offering and sale under the applicable
securities laws of such states and other  jurisdictions  of the United States as
the Agents may designate, and will maintain such qualifications in effect for as
long as may be required for the  distribution of the Notes;  provided,  however,
that the Company  shall not be obligated to file any general  consent to service
of process or to qualify as a foreign  corporation in any  jurisdiction in which
it is not so qualified. The Company will file such statements and reports as may
be  required  by the laws of each  jurisdiction  in which  the  Notes  have been
qualified as provided above.  The Company will promptly advise the Agents of the
receipt by the Company of any notification with respect to the suspension of the
qualification  of the Notes for sale in any such  state or  jurisdiction  or the
initiation or threatening of any proceeding for such purpose.

                                    -12-







      (i) 1934 Act Filings.  The Company,  during the period when the Prospectus
is required  to be  delivered  under the 1933 Act or the 1934 Act in  connection
with sales of the Notes,  will file all documents  required to be filed with the
SEC pursuant to Sections  13(a),  13(c),  14 or 15(d) of the 1934 Act within the
time periods prescribed by the 1934 Act and the 1934 Act Regulations.

      (j) Suspension of Certain  Obligations.  The Company shall not be required
to comply  with the  provisions  of  subsections  (b),  (d),  (e) or (f) of this
Section 4 or of subsections  (a), (b), (c) or (d) of Section 7 during any period
from the time the Agents shall have suspended  solicitation  of purchases of the
Notes in their  capacity  as agents  pursuant  to a request  from the Company to
cease such  solicitations,  until such time as the Company  notifies  the Agents
that  solicitation  of  purchases  of the  Notes  should be  resumed;  provided,
however, that compliance with such subsections shall be required for any portion
of such period during which any Agent has notified the Company that it holds any
Notes purchased hereunder as principal pursuant hereto.

      (k) Preparations of Pricing  Supplements.  The Company will prepare,  with
respect to any Notes to be sold to or through  one or more  Agents  pursuant  to
this  Agreement,  a Pricing  Supplement  with  respect  to such  Notes in a form
previously approved by the Agents and will file such Pricing Supplement pursuant
to Rule 424(b)(3) under the 1933 Act not later than the close of business of the
SEC on the third business day after the date on which such Pricing Supplement is
first used.

      (l) Stand-Off Agreement. If specified by the applicable Agent or Agents in
connection  with a purchase of Notes from the Company as principal,  between the
date of the  agreement  to  purchase  such  Notes and the  Settlement  Date with
respect to such  purchase,  the  Company  will not,  without  the prior  written
consent of such Agent or  Agents,  offer or sell,  grant any option for the sale
of, or enter into any  agreement  to sell,  any debt  securities  of the Company
(other  than  the  Notes  that  are to be sold  pursuant  to such  agreement  or
commercial  paper and  borrowings  under  bank  lines of credit in the  ordinary
course of business).


SECTION 5.  Conditions of Obligations.

      The  obligations  of the  Agents to  purchase  Notes  from the  Company as
principal and to solicit offers to purchase Notes as agents of the Company,  and
the  obligations of any purchaser of Notes sold through an Agent as agent,  will
be subject at all times to the accuracy of the representations and warranties on
the part of the Company  herein  contained and to the accuracy of the statements
of the Company's  officers  made in any  certificate  furnished  pursuant to the
provisions  hereof,  to the performance and observance by the Company of all its
covenants  and  agreements  herein  contained  and to the  following  additional
conditions precedent:

                                    -13-





     (a)  At the date  hereof,  the Agents  shall have  received a  certificate,
          dated the date hereof,  of the Company  signed by its President or one
          of its Vice Presidents and the Treasurer or an Assistant  Treasurer of
          the Company,  substantially in the form thereof attached as Appendix I
          hereto.

     (b)  At the date hereof, the Agents shall have received opinions, dated the
          date hereof, of LeBoeuf,  Lamb, Greene & MacRae,  L.L.P.,  counsel for
          the  Company,   and  Brown  &  Wood  LLP,   counsel  for  the  Agents,
          substantially  in the forms thereof attached hereto as Appendix II and
          III,  respectively,  with  reproduced or conformed  copies thereof for
          each of the Agents.

     (c)  At the date hereof, the Agents shall have received a letter, dated the
          date hereof, from Arthur Andersen LLP, substantially to the effect set
          forth in Appendix  IV hereto,  with  reproduced  or  conformed  copies
          thereof for each of the Agents.

     (d)  At the date hereof,  Brown & Wood LLP,  counsel for the Agents,  shall
          have been  furnished  with such  documents  and  opinions  as they may
          require for the purpose of enabling them to pass upon the issuance and
          sale of the Notes and the  issuance  and delivery of the Class A Bonds
          as  herein  contemplated  and  related  proceedings,  or in  order  to
          evidence the accuracy or completeness of any of the representations or
          warranties,  or  the  fulfillment  of any  of  the  conditions  herein
          contained; and all proceedings taken by the Company in connection with
          the  issuance  and sale of the Notes and the  issuance and delivery of
          the Class A Bonds as herein contemplated shall be satisfactory in form
          and substance to the Agents and Brown & Wood LLP.


SECTION       6. Delivery of and Payment for Notes Sold through an Agent.

      Delivery  of Notes  sold  through  an Agent as agent  shall be made by the
Company to such Agent for the  account of any  purchaser  only  against  payment
therefor in immediately  available  funds.  In the event that a purchaser  shall
fail  either to accept  delivery  of or to make  payment  for a Note on the date
fixed for  settlement,  such Agent shall promptly notify the Company and deliver
such Note to the Company and, if such Agent has theretofore paid the Company for
such Note,  the Company will promptly  return such funds to such Agent.  If such
failure  occurred  for any  reason  other  than  default  by such  Agent  in the
performance of its obligations hereunder,  the Company will reimburse such Agent
on an  equitable  basis for its loss of the use of the funds for the period such
funds were credited to the

                                    -14-






Company's  account  but in no event  shall the  Company be  required to pay such
Agent any commission with respect to such Note.


SECTION 7.  Subsequent Documentation Requirements of the Company.

      The Company covenants and agrees that:

      (a)  Subsequent   Delivery  of  Certificates.   Each  time  that  (i)  the
Registration Statement or the Prospectus shall be amended or supplemented (other
than by a Pricing  Supplement and other than by an amendment or supplement which
relates exclusively to the issuance and/or offering of securities other than the
Notes), (ii) there is filed with the SEC any document  incorporated by reference
into  the  Prospectus  (other  than any  Current  Report  on Form  8-K  relating
exclusively to the issuance and/or offering of securities  other than the Notes,
unless an Agent shall otherwise  specify),  or (iii) (if required by an Agent in
connection  with the purchase of Notes from the Company by one or more Agents as
principal)  the Company  sells Notes to such Agent or Agents as  principal,  the
Company  shall  furnish  or cause to be  furnished  to the  Agents  forthwith  a
certificate  dated  the  date of  filing  with  the SEC of  such  supplement  or
document, the date of effectiveness of such amendment, or the date of such sale,
as the case may be, in form  satisfactory to the Agents,  to the effect that the
statements contained in the certificate referred to in Section 5(a) hereof which
were last  furnished  to the  Agents  are true and  correct  at the time of such
amendment, supplement, filing or sale, as the case may be, as though made at and
as of such time  (except that such  statements  shall be deemed to relate to the
Registration  Statement and the Prospectus as amended and  supplemented  to such
time) or, in lieu of such  certificate,  a certificate  of the same tenor as the
certificate  referred to in said Section  5(a) hereof,  modified as necessary to
relate  to  the  Registration  Statement  and  the  Prospectus  as  amended  and
supplemented to the time of delivery of such certificate.

      (b)  Subsequent  Delivery  of  Legal  Opinions.  Each  time  that  (i) the
Registration Statement or the Prospectus shall be amended or supplemented (other
than by a Pricing Supplement or an amendment or supplement  providing solely for
the  inclusion  of  additional  financial  information,  and  other  than  by an
amendment  or  supplement  which  relates  exclusively  to an  offering  of debt
securities other than the Notes),  (ii) there is filed with the SEC any document
incorporated by reference into the Prospectus  (other than any Current Report on
Form 8-K or  Quarterly  Report on Form  10-Q,  unless an Agent  shall  otherwise
reasonably  request),  or (iii) (if required by an Agent in connection  with the
purchase  of Notes from the  Company  by one or more  Agents as  principal)  the
Company  sells Notes to such Agent or Agents as  principal,  the  Company  shall
furnish or cause to be  furnished  forthwith to the Agents and to counsel to the
Agents a written opinion of LeBoeuf,  Lamb, Greene & MacRae,  L.L.P., counsel to
the  Company,  dated  the  date of  filing  with the SEC of such  supplement  or
document, the

                                    -15-






date of effectiveness  of such amendment,  or the date of such sale, as the case
may be, in form and substance  satisfactory to the Agents,  of the same tenor as
the opinion referred to in Section 5(b) hereof, but modified,  as necessary,  to
relate  to  the  Registration  Statement  and  the  Prospectus  as  amended  and
supplemented  to the  time of  delivery  of such  opinion;  or,  in lieu of such
opinion,  such counsel shall furnish the Agents with a letter  substantially  in
the form of  Appendix  V hereto to the  effect  that the Agents may rely on such
last  opinion to the same  extent as though it was dated the date of such letter
authorizing  reliance  (except that  statements  in such last  opinion  shall be
deemed to relate to the Registration Statement and the Prospectus as amended and
supplemented to the time of delivery of such letter authorizing reliance).

      (c)  Subsequent  Delivery  of  Comfort  Letters.  Each  time  that (i) the
Registration  Statement or the Prospectus  shall be amended or  supplemented  to
include additional financial  information,  (ii) there is filed with the SEC any
document incorporated by reference into the Prospectus which contains additional
financial information,  or (iii) (if required by an Agent in connection with the
purchase  of Notes from the  Company  by one or more  Agents as  principal)  the
Company  sells Notes to such Agent or Agents as  principal,  the  Company  shall
cause Arthur  Andersen LLP  forthwith to furnish the Agents a letter,  dated the
date of  filing  with  the SEC of  such  supplement  or  document,  the  date of
effectiveness  of such amendment,  or the date of such sale, as the case may be,
in form  satisfactory to the Agents, of the same tenor as the letter referred to
in Section 5(c) hereof but modified to relate to the Registration  Statement and
Prospectus as amended and supplemented to the date of such letter, and with such
changes as may be necessary to reflect  changes in the financial  statements and
other information derived from the accounting records of the Company;  provided,
however,  that if the  Registration  Statement or the  Prospectus  is amended or
supplemented  solely to  include  financial  information  as of and for a fiscal
quarter, Arthur Andersen LLP may limit the scope of such letter to the unaudited
financial  statements  included in such amendment or supplement unless any other
information  included therein of an accounting,  financial or statistical nature
is of such a nature that, in the reasonable  judgment of the Agents, such letter
should cover such other information.

      (d) Subsequent Delivery of Documents Pursuant to the Indenture.  Each time
that the Company shall deliver  documents to the Trustee  pursuant to Article IV
of the  Indenture  with  respect  to the Notes or  Article  III of the PSCo 1939
Mortgage  (as  defined in the  Indenture)  with  respect to Class A Bonds  being
issued  with  respect to the Notes,  the  Company  shall  furnish or cause to be
furnished to the Agents and to counsel to the Agents a copy of such documents.



                                    -16-






SECTION 8.  Indemnification.

      (a)  Indemnification  of the Agents.  The Company  agrees to indemnify and
hold harmless each Agent and each person, if any, who controls such Agent within
the meaning of Section 15 of the 1933 Act  against  any and all losses,  claims,
damages  or  liabilities,  joint or  several,  to which  they or any of them may
become  subject  under the 1933 Act or any other  statute  or common  law and to
reimburse each such Agent and controlling person for any legal or other expenses
(including,  subject to subparagraph  (c) of this Section 8, reasonable  counsel
fees) incurred by them, as incurred, in connection with any such losses, claims,
damages or liabilities or in connection with  investigating  or preparing for or
defending  against any  litigation,  or any  investigation  or proceeding by any
governmental  agency or body,  commenced or  threatened,  or in connection  with
effecting a settlement of any such  litigation,  investigation or proceeding (if
such settlement is effected with the written consent of the Company), insofar as
such losses, claims, damages, liabilities, expenses, litigation,  investigations
or proceedings  arise out of, or are based upon, an untrue  statement or alleged
untrue statement of a material fact contained in the Registration  Statement, or
in any amendment  thereto,  or the omission or alleged  omission  therefrom of a
material fact required to be stated  therein or necessary to make the statements
therein not misleading,  or an untrue statement or alleged untrue statement of a
material fact included in the  Prospectus,  as it may have been or be amended or
supplemented,  or the omission or alleged omission  therefrom of a material fact
necessary  in  order  to  make  the  statements  therein,  in the  light  of the
circumstances  under which they were made, not  misleading;  provided,  however,
that the indemnity  agreement contained in this subparagraph (a) shall not apply
to  any  such  losses,  claims,  damages,  liabilities,   expenses,  litigation,
investigations  or  proceedings  arising out of, or based upon,  any such untrue
statement or alleged untrue statement, or any such omission or alleged omission,
if such  statement or omission was made in reliance upon and in conformity  with
information  furnished in writing to the Company by the Agents expressly for use
in the Prospectus, or any amendment or supplement thereto, or arising out of, or
based upon,  any such untrue  statement or alleged  untrue  statement in, or any
such omission or alleged  omission from, the Trustee's  Statement of Eligibility
under  the 1939 Act  filed as an  exhibit  to the  Registration  Statement;  and
provided,  further,  that the indemnity agreement contained in this subparagraph
(a) shall not inure to the  benefit  of any Agent or of any  person  controlling
such  Agent on  account of any such loss,  claim,  damage,  liability,  expense,
litigation,  investigation  or proceeding  arising from the sale of Notes to any
person if (i) such Agent  shall have  failed to send or give to such  person (A)
with or prior to the written confirmation of such sale, a copy of the Prospectus
together with any amendments or supplements thereto which shall theretofore have
been furnished to such Agent, or (B) with or prior to the delivery of such Notes
to such person,  a copy of any amendment or supplement to the  Prospectus  which
shall have been furnished to such Agent subsequent to such written  confirmation
and prior to the delivery

                                    -17-






of such  Notes to such  person,  and (ii) in either  such  case,  any  untrue or
misleading  statement  or omission  made or alleged to have been made shall have
been  eliminated  or remedied in the  Prospectus  or the amendment or supplement
thereto which such Agent so failed to send or give to such person and such Agent
would  not  have  been  liable  had a copy  of  such  Prospectus,  amendment  or
supplement, as the case may be, been so sent or given to such person. Each Agent
agrees  promptly to notify the Company and each other Agent of the  commencement
of  any  litigation,  investigations  or  proceedings  against  it or  any  such
controlling person in connection with the issuance and sale of the Notes.

      (b)  Indemnification  of the Company.  Each Agent agrees to indemnify  and
hold  harmless the Company,  its  directors  and  officers,  and each person who
controls  the  Company  within the meaning of Section 15 of the 1933 Act against
any and all losses, claims,  damages or liabilities,  joint or several, to which
they or any of them may become  subject  under the 1933 Act or any other statute
or common  law and to  reimburse  each of them for any  legal or other  expenses
(including,  subject to subparagraph  (c) of this Section 8, reasonable  counsel
fees) incurred by them, as incurred, in connection with any such losses, claims,
damages or liabilities or in connection with  investigating  or preparing for or
defending  against any  litigation,  or any  investigation  or proceeding by any
governmental  agency or body,  commenced or  threatened,  or in connection  with
effecting a settlement of any such  litigation,  investigation or proceeding (if
such  settlement  is effected  with the written  consent of each Agent  affected
thereby),  insofar  as such  losses,  claims,  damages,  liabilities,  expenses,
litigations,  investigations  or  proceedings  arise out of or are based upon an
untrue  statement or alleged untrue statement of a material fact included in the
Prospectus,  or any amendment or supplement  thereto, or the omission or alleged
omission  therefrom of a material fact necessary in order to make the statements
therein,  in the light of the  circumstances  under  which they were  made,  not
misleading,  if such  statement  or omission  was made in  reliance  upon and in
conformity  with  information  furnished in writing to the Company by the Agents
expressly for use in the Prospectus, or any amendment or supplement thereto. The
Company  agrees  promptly  to  notify  the  Agents  of the  commencement  of any
litigation,  investigation  or  proceeding  against  it,  any such  director  or
officer,  or any such  controlling  person,  in connection with the issuance and
sale of the Notes.

      (c) General.  The Company and the several  Agents each agrees  that,  upon
receipt of notice of the  commencement of any action against it or any director,
officer or person  controlling the Company or any person  controlling such Agent
as  aforesaid,  in  respect of which  indemnity  may be sought on account of any
indemnity  agreement  contained  herein,  it will  promptly  give  notice of the
commencement  thereof to the party or parties  against whom  indemnity  shall be
sought  hereunder,  but the  omission  so to notify such  indemnifying  party or
parties of any such action shall not relieve such indemnifying  party or parties
from any liability which it or they may have to the indemnified

                                    -18-






party otherwise than on account of such indemnity agreement. In case such notice
of any such action shall be so given, such indemnifying  party shall be entitled
to participate at its own expense in the defense, or, if it so elects, to assume
(in  conjunction  with any other  indemnifying  parties)  the  defense,  of such
action, in which event such defense shall be conducted by counsel chosen by such
indemnifying  party or parties  and  satisfactory  to the  indemnified  party or
parties who shall be defendant or defendants  in such action.  In no event shall
the  indemnifying  parties  be  liable  for fees and  expenses  of more than one
counsel (in addition to one local  counsel)  separate from their own counsel for
all  indemnified  parties  in  connection  with any one action or  separate  but
similar or  related  actions in the same  jurisdiction  arising  out of the same
general allegations or circumstances. The indemnity agreements contained in this
Section 8 shall be in addition to any liability  which the Company or the Agents
may otherwise have.


SECTION 9.  Payment of Expenses.

      The  Company  will pay all  expenses  incident to the  performance  of its
obligations under this Agreement, including:

               (a) The preparation and filing of the Registration  Statement and
          all  amendments  thereto  and the  Prospectus  and any  amendments  or
          supplements thereto;

               (b) The preparation, filing and reproduction of this Agreement;

               (c) The  preparation,  printing,  issuance  and  delivery  of the
          Notes,  including  any  fees  and  expenses  relating  to  the  use of
          book-entry notes;

               (d) The fees and  disbursements of the Company's  accountants and
          counsel,  of the Trustee and its counsel,  and of The Depository Trust
          Company;

               (e) The  reasonable  fees and  disbursements  of  counsel  to the
          Agents  incurred in connection with the  establishment  of the program
          relating  to the Notes and  incurred  from time to time in  connection
          with the transactions contemplated hereby;

               (f) The  qualification  of the Notes  under state  securities  or
          "Blue Sky" laws in  accordance  with the  provisions  of Section  4(h)
          hereof,   including   filing   fees  and  the   reasonable   fees  and
          disbursements of counsel to the Agents in connection  therewith and in
          connection  with the  preparation of any Blue Sky Survey and any Legal
          Investment  Survey,  and the  printing  and  delivery to the Agents of
          copies of any Blue Sky Survey and any Legal Investment Survey;


                                    -19-






               (g) The  printing  and  delivery to the Agents in  quantities  as
          hereinabove  stated of copies of the  Registration  Statement  and any
          amendments  thereto,  and of the  Prospectus  and  any  amendments  or
          supplements  thereto, and the delivery by the Agents of the Prospectus
          and  any  amendments  or  supplements   thereto  in  connection   with
          solicitations or confirmations of sales of the Notes;

               (h) The  preparation,  printing  and  delivery  to the  Agents of
          copies of the Indenture and all supplements and amendments thereto;

               (i) Any fees  charged  by rating  agencies  for the rating of the
          Notes;

               (j) The fees and expenses incurred in connection with the listing
          of the Notes on any securities exchange;

               (k) The fees and expenses,  if any,  incurred with respect to any
          filing with the National Association of Securities Dealers, Inc.;

               (l)The  cost of  providing  any  CUSIP  or  other  identification
          numbers for the Notes; and

               (m) Any reasonable  out-of-pocket expenses incurred by the Agents
          in  connection  with this  Agreement,  provided  that the Agents  have
          notified  the Company of any such  expenses  prior to  incurring  such
          expenses.


SECTION 10.  Representations, Warranties and Agreements to
               Survive Delivery.

      All representations, warranties and agreements contained in this Agreement
or in certificates of officers of the Company submitted  pursuant hereto,  shall
remain operative and in full force and effect,  regardless of any  investigation
made by or on behalf of the Agents or any controlling  person of an Agent, or by
or on behalf of the Company,  and shall survive each delivery of and payment for
any of the Notes.


SECTION 11.  Termination.

      (a) Termination of this Agreement. This Agreement (excluding any agreement
by one or more Agents to purchase  Notes from the Company as  principal)  may be
terminated  for any  reason,  at any time by either the Company or an Agent with
respect  to such  Agent  upon the  giving  of 30 days'  written  notice  of such
termination to the other parties hereto.

      (b)   Termination of Agreement to Purchase Notes as
Principal.  An Agent or Agents may terminate any agreement by
such Agent or Agents to purchase Notes from the Company as

                                    -20-






principal,  immediately  upon  notice to the  Company,  at any time prior to the
Settlement Date relating thereto, if:

              (i) (A) the  Company  shall have  failed or refused to perform any
                  covenant or agreement on its part to be performed hereunder at
                  or  prior  to  the  Settlement  Date,  or (B)  the  conditions
                  specified in Section 5 hereof shall not have been fulfilled;

             (ii) the subject  matter of the  Prospectus  or of any amendment or
                  supplement  to the  Prospectus  (other  than an  amendment  or
                  supplement  relating  solely to the activities of any Agent or
                  Agents),  in the reasonable judgment of such Agent, shall have
                  made it  impracticable  for such Agent to market the Notes, or
                  to enforce contracts for the sale of the Notes, upon the terms
                  specified in the Prospectus;

            (iii) (A) there shall have  occurred any outbreak or  escalation  of
                  hostilities  or other  national or  international  calamity or
                  crisis,  (B) trading in the Common Stock of the Company  shall
                  have  been  suspended  by the SEC or any  national  securities
                  exchange,  or trading generally on the New York Stock Exchange
                  shall have been  suspended,  or minimum or maximum  prices for
                  trading  shall have been fixed,  or maximum  ranges for prices
                  for securities shall have been required on said exchange or by
                  order of the SEC or any other  governmental  authority  having
                  jurisdiction,  or (C) a  banking  moratorium  shall  have been
                  declared by either Federal or New York State  authorities,  in
                  any such case with the result that, in the reasonable judgment
                  of such  Agent,  it shall be  impracticable  for such Agent to
                  market the Notes, or to enforce  contracts for the sale of the
                  Notes, upon the terms specified in the Prospectus; or

             (iv) the rating  assigned  by Moody's  Investors  Service,  Inc. or
                  Standard & Poor's  Ratings  Service to the Program or any debt
                  securities of the Company as of the date of such  agreement to
                  purchase  Notes from the Company as principal  shall have been
                  lowered since such date or Moody's Investors Service,  Inc. or
                  Standard & Poor's  Ratings  Service  shall have  informed  the
                  Company or publicly  announced that it has under  surveillance
                  or review, with possible negative implications,  its rating of
                  the  Program or any debt  securities  of the  Company or shall
                  have   withdrawn  its  rating  of  the  Program  or  any  debt
                  securities of the Company.

      (c) General. In the event of any such termination,  no party will have any
liability in respect of this  Agreement or such agreement to purchase Notes from
the Company as  principal,  as the case may be, to the other  parties  hereto or
thereto,

                                    -21-






except  that (i) the  Agents  shall be  entitled  to any  commissions  earned in
accordance with the third paragraph of Section 3(b) hereof,  (ii) if at the time
of  termination  (a) any Agent shall own any Notes  purchased by it hereunder as
principal  with the intention of reselling  them and shall so notify the Company
or (b) an offer to  purchase  any of the Notes has been  accepted by the Company
but the time of  delivery  to the  purchaser  or his  agent of the Note or Notes
relating  thereto has not occurred,  the covenants set forth in Sections 4 and 7
hereof shall remain in effect  until such Notes are so resold or  delivered,  as
the case may be,  (iii) the  covenant  set forth in  Section  4(g)  hereof,  the
indemnity  agreement  set  forth in  Section  8 hereof,  and the  provisions  of
Sections  10,  13 and 14  hereof  shall  remain  in  effect  and  (iv)  if  such
termination is pursuant to subsection  (a),  (b)(i),  (b)(ii) or (b)(iv) of this
Section 11, the Company  shall  reimburse  the  expenses of the Agents and their
counsel to the extent provided in Section 9.


SECTION 12.  Notices.

      Unless otherwise provided herein, all notices required under the terms and
provisions  hereof shall be in writing,  either  delivered by hand,  by mail, by
telegram or by facsimile (confirmed by telephone),  and any such notice shall be
effective when received at the address specified below.


      If to the Company:

            Public Service Company of Colorado
            1225 17th Street
            Denver, Colorado  80202
            Attention:
            Facsimile:
            Telephone:

      If to the Agents:

            Merrill Lynch & Co.
            Merrill Lynch, Pierce, Fenner & Smith
                 Incorporated
            World Financial Center
            North Tower, 10th Floor
            New York, New York  10281-1310
            Attention:  MTN Product Management
            Facsimile:  (212) 449-2234
            Telephone:

            Goldman, Sachs & Co.
            85 Broad Street
            New York, New York  10004
            Attention:  Credit Control - Medium-Term Notes
            Facsimile:  (212) 357-8680
            Telephone:  (212) 902-3711


                                    -22-







or at such other address as such party may designate from time to time by notice
duly given in accordance with the terms of this Section 12.


SECTION 13.  Parties.

      This  Agreement  shall  inure to the  benefit of and be binding  upon each
Agent and the Company and their  respective  successors.  Nothing  expressed  or
mentioned  in this  Agreement  is  intended  or shall be  construed  to give any
person, firm or corporation,  other than the parties hereto and their respective
successors and the controlling persons and officers and directors referred to in
Section 8 and their  heirs and  legal  representatives,  any legal or  equitable
right,  remedy or claim under or in respect of this  Agreement or any  provision
herein  contained.  This Agreement and all conditions and provisions  hereof are
intended  to be for the sole and  exclusive  benefit of the  parties  hereto and
their  respective  successors  and said  controlling  persons and  officers  and
directors and their heirs and legal  representatives,  and for the benefit of no
other person, firm or corporation. No purchaser of Notes shall be deemed to be a
successor by reason merely of such purchase.


SECTION 14.  Governing Law.

      This Agreement and all the rights and  obligations of the parties  created
hereby  shall be governed by and  construed in  accordance  with the laws of the
State of New York  applicable  to  agreements  made and to be  performed in such
State.


SECTION 15.  Counterparts.

      This  Agreement  may be  executed  in one or  more  counterparts  and,  if
executed in more than one counterpart,  the executed  counterparts  hereof shall
constitute a single instrument.



                                    -23-






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

                                    Very truly yours,

                                    PUBLIC SERVICE COMPANY OF COLORADO


                                    By________________________________
                                      Title:


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


MERRILL LYNCH, PIERCE FENNER & SMITH
            INCORPORATED



By__________________________________
  Name:
  Title:



GOLDMAN, SACHS & CO.



____________________________________
     (Goldman, Sachs & Co.)



                                    -24-






                                                                       EXHIBIT A




      The  following  terms,  if  applicable,  shall be agreed to by one or more
Agents and the Company in connection with each sale of Notes:



            Principal Amount:  $________

            Interest Rate:
            Default Rate:
            Interest Payment Dates:

            If Redeemable at the option of the Company:

              Initial Redemption Date:
              Initial Redemption Percentage:
              Annual Redemption Percentage Reduction, if any:

            If Repayable at the option of Holders:

              Repayment Date(s):
              Repayment Price:

            Original Issue Date:
            Date of Maturity:
            Authorized Denomination:
            Purchase Price:  ___%, plus accrued interest, if any,
            from ____________
            Settlement Date and Time:
            Additional Terms:

      In  connection  with the purchase of Notes from the Company by one or more
Agents as principal, agreement as to whether the following will be required:

      Officer's  Certificate  pursuant  to  Section  7(a)  of  the  Distribution
        Agreement.
      Legal Opinions pursuant to Section 7(b) of the Distribution Agreement.
      Comfort Letter pursuant to Section 7(c) of the Distribution Agreement.
      Stand-off   Agreement   pursuant  to  Section  4(l)  of  the  Distribution
        Agreement.


                                    -1-






                                                                      Schedule A




      As  compensation  for the  services of the Agents  hereunder,  the Company
shall pay the applicable  Agent,  on a discount basis, a commission for the sale
of each  Note  equal to the  principal  amount of such  Note  multiplied  by the
appropriate percentage set forth below:

                                                    Percent of
            Maturity Ranges                     Principal Amount
            ---------------                     ----------------

From  9 months to less than 1 year  . . . . . . .     .125%
From  1 year to less than 18 months . . . . . . .     .150%
From  18 months to less than 2 years  . . . . . .     .200%
From  2 years to less than 3 years  . . . . . . .     .250%
From  3 years to less than 4 years  . . . . . . .     .350%
From  4 years to less than 5 years  . . . . . . .     .450%
From  5 years to less than 6 years  . . . . . . .     .500%
From  6 years to less than 7 years  . . . . . . .     .550%
From  7 years to less than 10 years . . . . . . .     .600%
From  10 years to less than 15 years  . . . . . .     .625%
From  15 years to less than 20 years  . . . . . .     .700%
From  20 years to 30 years  . . . . . . . . . . .     .750%












                                    -1-






                                                                      APPENDIX I




                         FORM OF OFFICER'S CERTIFICATE
                         -----------------------------

                      PUBLIC SERVICE COMPANY OF COLORADO


      We, [authorized  officers' names],  [the President] [a Vice President] and
[the Treasurer] [an Assistant Treasurer] respectively, of Public Service Company
of Colorado, a Colorado corporation (the "Company"), pursuant to Section 5(a) of
the Distribution  Agreement dated  _____________ (the "Distribution  Agreement")
among  the  Company  and  [Agents],  hereby  certify  that,  to the  best of our
knowledge, after reasonable investigation:

     1.  Since  the  respective  dates as of which  information  is given in the
Registration  Statement  and  Prospectus  (as  such  terms  are  defined  in the
Distribution  Agreement),  except as otherwise  stated  therein or  contemplated
thereby,  [or since [insert date of applicable agreement by an Agent to purchase
Notes from the Company as principal]],  there has not been any material  adverse
change in the business,  property or condition,  financial or otherwise,  of the
Company  and its  subsidiaries  considered  as one  enterprise,  whether  or not
arising in the ordinary course of business;

     2. The representations and warranties of the Company contained in Section 2
of the  Distribution  Agreement  are true and  correct  with the same  force and
effect as though expressly made at and as of the date hereof;

     3. The Company has performed or complied with all  agreements and satisfied
all  conditions on its part to be performed or satisfied at or prior to the date
hereof; and

     4. No stop order suspending the effectiveness of the Registration Statement
has been  issued  and no  proceeding  for that  purpose  has been  initiated  or
threatened by the Securities and Exchange Commission.



                                       I-1






      IN WITNESS WHEREOF, we have hereunto signed our names and affixed the seal
of the Company.

Dated:  _____________, ____
                                          ________________________________
                                          [Title]
[SEAL]

                                          ________________________________
                                          [Title]


                                       I-2


                                                                   Appendix II
                                                                       to
                                                                  Distribution
                                                                    Agreement

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


[Agents]
Ladies and Gentlemen:

      We have acted as  counsel  to Public  Service  Company  of  Colorado  (the
"Company")  in  connection  with the sale by the  Company of 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"),  which are  registered
pursuant to the  registration  statement (File No.  333-____) of the Company for
the registration  under the Securities Act of 1933, as amended (the "1933 Act"),
of up to  $400,000,000  in aggregate  principal  amount of its First  Collateral
Trust  bonds,  including  the  Notes.  This  opinion is being  delivered  to you
pursuant to Section  5(b) of the  Distribution  Agreement,  dated  _______  (the
"Agreement"),  between the Company and the several  agents  named  therein  (the
"Agents").  Unless  otherwise  stated,  defined terms used herein shall have the
respective meanings given them in the Agreement.

      We are not general  counsel to the Company and our  representation  of the
Company consists of advising it with respect to corporate and regulatory matters
as to which we have been specifically  consulted. We are familiar with the legal
matters  pertaining to, and the corporate  proceedings of the Company taken with
respect to, the  authorization  of the  issuance  and sale by the Company of the
Notes and the  authorization  of the issuance and delivery of the Class A Bonds.
We have  examined,  among  other  things,  the  Registration  Statement  and the
Prospectus,  and any amendment or supplement  thereto,  the corporate records of
the Company, the Indenture,  the Supplemental  Indenture creating the Notes, the
PSCO  1939  Mortgage  and  the   supplemental   indenture   thereto  (the  "1939
Supplemental  Mortgage")  under  which the Class A Bonds are being  issued,  the
proceedings before The Public Utilities Commission of the State of Colorado with
respect to the  issuance  and sale of the Notes and the issuance and delivery of
the Class A Bonds and such other  proceedings,  papers and  documents as we have
deemed relevant for the purpose of rendering the opinions  enumerated  below. In
such  examination,  we have  assumed  the  genuineness  of all  signatures,  the
authenticity  of all documents  submitted to us as originals,  the conformity to
the  original  documents  of all  documents  submitted  to us as copies  and the
authenticity  of all  such  latter  documents.  We  have  relied  as to  various
questions of fact upon  discussions  with  officers and  representatives  of the
Company and the  representations  and warranties of the Company contained in the
Agreement and upon the  certificates of public  officials and of officers of the
Company  being  delivered  to you  thereunder.  With  respect  to  the  opinions
expressed  in  paragraphs  (xii),  (xiii)  and (xiv)  below,  we have  relied on
information obtained from public records and from the Company.

      On the  basis  of the  foregoing,  and  subject  to  the  limitations  and
qualifications set forth herein, it is our opinion that:

     (i)  The Company has been duly  incorporated  and is validly  existing as a
          corporation  in good standing  under the laws of the State of Colorado
          with  corporate  power and  authority  to own,  lease and  operate its
          properties and to conduct its business as described in the Prospectus,
          as amended or supplemented to the date hereof.

     (ii) To the best of our  knowledge,  the  Company  is duly  qualified  as a
          foreign  corporation  to transact  business and is in good standing in
          each jurisdiction in which such qualification is required,  whether by
          reason of the  ownership  or leasing  of  property  or the  conduct of
          business,  except  where  the  failure  to so  qualify  or be in  good
          standing  would not have a material  adverse  effect on the  business,
          properties  or   operations  of  the  Company  and  its   subsidiaries
          considered as one enterprise.


                                    B-1





     (iii)Each Significant  Subsidiary of the Company (as defined in Rule 405(c)
          of   Regulation  C  under  the  1933  Act),  if  any,  has  been  duly
          incorporated and is validly existing as a corporation in good standing
          under the laws of the jurisdiction of its incorporation, has corporate
          power and  authority  to own,  lease and  operate its  properties  and
          conduct its business as described in the  Registration  Statement  and
          the Prospectus, as amended or supplemented to the date hereof, and, to
          the best of our knowledge,  is duly qualified as a foreign corporation
          to transact  business and is in good standing in each  jurisdiction in
          which  such  qualification  is  required,  whether  by  reason  of the
          ownership  or leasing of property or the conduct of  business,  except
          where the failure to so qualify or be in good standing  would not have
          a material adverse effect on the business, properties or operations of
          the Company and its subsidiaries considered as one enterprise.

     (iv) To the best of our  knowledge,  the Company is not in violation of its
          charter or by-laws or in default in the  performance  or observance of
          any material obligation, agreement, covenant or condition contained in
          any contract,  indenture,  mortgage,  loan agreement,  note,  lease or
          other  instrument  to which it is a party or by which it or any of its
          properties may be bound.  The execution and delivery of the Agreement,
          the Supplemental  Indenture,  the 1939  Supplemental  Mortgage and the
          consummation  of  the  transactions   contemplated   therein  and  the
          incurrence  of the  obligations  therein  contained  will not conflict
          with,  or  constitute  a breach of, or default  under,  or (other than
          under the Indenture and the 1939  Mortgage)  result in the creation or
          imposition  of any lien,  charge or  encumbrance  upon any property or
          assets of the Company pursuant to, any contract, indenture,  mortgage,
          loan agreement,  note,  lease or other  instrument  known to us and to
          which the  Company  is a party or by which it may be bound or to which
          any of its property or assets is subject,  or any law,  administrative
          regulation or  administrative  or court order or decree known to us to
          be  applicable  to the  Company of any court or  governmental  agency,
          authority  or body or any  arbitrator  having  jurisdiction  over  the
          Company;  nor  will  such  action  result  in  any  violation  of  the
          provisions of the charter or by-laws of the Company.

     (v)  The  Indenture  has been duly and  validly  authorized,  executed  and
          delivered  by the Company and is in due and proper form and  (assuming
          the Indenture has been duly authorized,  executed and delivered by the
          Trustee)  constitutes  a legal,  valid  and  binding  mortgage  of the
          Company,   enforceable  in  accordance  with  its  terms,   except  as
          enforcement  thereof may be limited by laws and  principles  of equity
          affecting   generally  the   enforcement  of  mortgagees'   and  other
          creditors'  rights,   including  without  limitation   bankruptcy  and
          insolvency laws and state laws which affect the enforcement of certain
          remedial  provisions of the Indenture;  provided,  however,  that such
          state laws will not, in our opinion,  render the remedies  afforded by
          the Indenture inadequate for the practical  realization of the benefit
          of the security provided thereby.

     (vi) The Indenture is qualified  under the Trust  Indenture Act of 1939, as
          amended.

    (vii) The Notes are in due and proper form and the  issuance and sale of the
          Notes have been duly authorized by all necessary corporate action, and
          when a Note has been duly executed and  authenticated  as specified in
          the Indenture and the Company Order and Officer's Certificate (each as
          defined  in the  Indenture)  applicable  to such  Note  and  delivered
          against payment of the consideration therefor determined in accordance
          with the  Agreement,  such  Note will be a legal,  valid  and  binding
          obligation of the Company  enforceable  (subject to the exceptions and
          limitations  referred to in paragraph (v) hereof) in  accordance  with
          its terms and entitled to the benefits and security of the  Indenture;
          and,   assuming  that  the   Supplemental   Indenture  has  been  duly
          transmitted to the appropriate public officials for recording and will
          be duly recorded,  such Note will be secured  equally and ratably with
          all other Notes and bonds outstanding under the Indenture.

   (viii) The PSCO 1939 Mortgage has been duly and validly authorized, executed
          and  delivered  by the  Company  and is in due  and  proper  form  and
          (assuming  the PSCO 1939 Mortgage has been duly  authorized,  executed
          and delivered by the trustee  thereunder)  constitutes a legal,  valid
          and binding  mortgage of the Company,  enforceable in accordance  with
          its terms,  except as  enforcement  thereof may be limited by laws and
          principles  of  equity   affecting   generally  the   enforcement   of
          mortgagees'

                                    B-2





          and other creditors' rights,  including without limitation  bankruptcy
          and  insolvency  laws and state laws which affect the  enforcement  of
          certain  remedial  provisions  of the PSCO  1939  Mortgage;  provided,
          however,  that such state laws will not,  in our  opinion,  render the
          remedies  afforded  by the  PSCO  1939  Mortgage  inadequate  for  the
          practical realization of the benefit of the security provided thereby.

     (ix) The  Class A Bonds are in due and  proper  form and the  issuance  and
          delivery  of the  Class A  Bonds  have  been  duly  authorized  by all
          necessary  corporate action; and when (a) a Class A Bond has been duly
          executed,  authenticated  and delivered to the Trustee as specified in
          the PSCO 1939  Mortgage  and the order of an  officer  of the  Company
          applicable to such Class A Bond and (b) the related Note has been duly
          executed  and  authenticated  as specified  in the  Indenture  and the
          Company  Order and Officer's  Certificate  applicable to such Note and
          delivered against payment of the consideration  therefor determined in
          accordance  with the  Agreement,  such  Class A Bond  will be a legal,
          valid and binding  obligation of the Company  enforceable  (subject to
          the exceptions and limitations referred to in paragraph (viii) hereof)
          in accordance with its terms and entitled to the benefits and security
          of the PSCO 1939 Mortgage;  and,  assuming that the 1939  Supplemental
          Mortgage has been duly transmitted to the appropriate public officials
          for  recording  and will be duly  recorded,  such Class A Bond will be
          secured equally and ratably with all other bonds outstanding under the
          PSCO  1939   Mortgage   (except  to  the  extent  that  any   sinking,
          amortization, improvement or other fund may afford additional security
          for such bonds of any particular series).

     (x)  The Agreement has been duly authorized,  executed and delivered by the
          Company.

     (xi) The issuance  and sale of the Notes,  and the issuance and delivery of
          the Class A Bonds,  have been duly authorized and approved by an order
          of The Public  Utilities  Commission of the State of Colorado and such
          order is final and in full  force and effect on the date  hereof,  the
          time for  appeal  therefrom  or review  thereof or  intervention  with
          respect thereto having expired;  no further  approval,  authorization,
          consent or other  order of any  public  board or body  (other  than in
          connection or compliance with the provisions of the securities laws of
          any jurisdiction) is legally required for the issuance and sale by the
          Company of the Notes pursuant to the Agreement or for the issuance and
          delivery  of the Class A Bonds;  and the Company is  presently  exempt
          from all of the provisions of the Public Utility  Holding  Company Act
          of 1935, as amended, except Section 9(a)(2) thereof.

     xii) The  Company  has good title to the real  properties  specifically  or
          generally  described or referred to in the  Indenture  and in the PSCO
          1939 Mortgage as subject to the respective  liens thereof (except such
          real property as may have been sold,  exchanged or otherwise  disposed
          of), subject only to (a) in the case of all such properties,  the lien
          of the PSCO 1939 Mortgage and "permitted  encumbrances" (as defined in
          the PSCO 1939 Mortgage) and (b) in the case of such  properties  which
          are used or to be used in or in connection  with the Electric  Utility
          Business  (as  defined in the  Indenture)  (whether or not such is the
          sole use of such  property)  the lien of the  Indenture  and Permitted
          Liens (as defined in the Indenture).

   (xiii) The Indenture   constitutes  a   mortgage   lien  on  the   properties
          specifically or generally  described or referred to therein as subject
          to the lien  thereof  (except such  properties  as may have been sold,
          exchanged or otherwise  disposed of or released  from the lien thereof
          in accordance  with the terms  thereof),  subject to no liens prior to
          the lien of the Indenture  other than Permitted  Liens and the lien of
          the PSCO 1939  Mortgage;  and the  Indenture by its terms  effectively
          subjects to the lien  thereof  all  property  (except  property of the
          kinds  specifically  excepted  from the lien of the  Indenture  by the
          terms thereof) acquired by the Company after the date of execution and
          delivery of the  Indenture  and used or to be used in or in connection
          with the Electric  Utility  Business,  subject to Permitted Liens, the
          lien of the PSCO 1939 Mortgage,  any lien thereon existing at the time
          of such  acquisition  and to any  liens  for  unpaid  portions  of the
          purchase  money placed  thereon at the time of such  acquisition,  and
          also subject to the provisions of Article Thirteen of the

                                    B-3





          Indenture  and to certain  possible  claims of a trustee in bankruptcy
          and possible claims and taxes of the federal government.

    (xiv) The  PSCO  1939  Mortgage  constitutes  a first  mortgage  lien on the
          properties  specifically or generally described or referred to therein
          as subject to the lien thereof,  including the shares of stock pledged
          thereunder  (except such property as may have been sold,  exchanged or
          otherwise  disposed of or released from the lien thereof in accordance
          with the terms thereof),  subject to no liens prior to the lien of the
          PSCO 1939 Mortgage other than "permitted  encumbrances";  and the PSCO
          1939  Mortgage by its terms  effectively  subjects to the lien thereof
          all property (except property of the kinds specifically  excepted from
          the lien of the PSCO 1939 Mortgage by the terms  thereof)  acquired by
          the Company  after the date of the  execution and delivery of the PSCO
          1939  Mortgage,  subject  to  "permitted  encumbrances",  to any  lien
          thereon  existing at the time of such acquisition and to any liens for
          unpaid  portions of the purchase  money placed  thereon at the time of
          such acquisition,  and also subject to the provisions of Article XI of
          the PSCO 1939 Mortgage and to certain  possible claims of a trustee in
          bankruptcy and possible claims and taxes of the federal government.

     (xv) The facsimile  signature of a Senior Vice  President or Vice President
          of the  Company in lieu of his manual  signature  on the Notes and the
          Class A Bonds  and the  facsimile  signature  of the  Secretary  or an
          Assistant  Secretary of the Company  attesting the  corporate  seal in
          lieu of his manual  signature  on the Notes and the Class A Bonds have
          been duly and  properly  authorized  by the Board of  Directors of the
          Company,  are not  inconsistent  with the  provisions  of the Restated
          Articles of Incorporation,  as amended,  or By-Laws of the Company and
          are valid and effective  under the laws of the State of Colorado;  and
          the facsimile signatures of such officers on the Notes and the Class A
          Bonds have the same legal  effect as though they had  manually  signed
          and  attested  the  Notes  and the  Class A Bonds  as such  respective
          officers.

    (xvi) The  statements  in the  Company's  Annual Report on Form 10-K for the
          fiscal year ended  December 31, 1995,  incorporated  by reference into
          the  Prospectus,   under  the  headings  "Regulation  and  Rates"  and
          "Franchises"  in Item 1. BUSINESS and under the heading  "Character of
          Ownership"  in  Item  2.   Properties,   and  the  statements  in  the
          Prospectus, and any amendment or supplement thereto, under the caption
          "Security"  under  "Description of the New Bonds" 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 us and are
          correct in all material  respects and fairly  present the  information
          purported to be given. The Notes, the Indenture, the Class A Bonds and
          the PSCO 1939 Mortgage conform as to legal matters to the descriptions
          thereof  contained in the  Registration  Statement and Prospectus,  as
          amended or supplemented to the date hereof.

   (xvii) [Except  to  the  extent  set  forth  in the  next  sentence  of  this
          paragraph  (xvii),]  the  franchises  held  by  the  Company  and  its
          subsidiaries, together with the applicable Certificates of Convenience
          and Necessity issued by The Public  Utilities  Commission of the State
          of Colorado and the Public  Service  Commission  of Wyoming,  give the
          Company  and  such  subsidiaries  all  necessary   authority  for  the
          maintenance and operation of their respective  properties and business
          as now  conducted,  and  are  free  from  burdensome  restrictions  or
          conditions of an unusual character.  [As disclosed in the Incorporated
          Documents, the Company is currently providing gas and electric service
          to one  previously  franchised  municipality  while a new franchise is
          being negotiated.]

  (xviii) The  descriptions in the Registration  Statement and  the  Prospectus,
          as amended or supplemented to the date hereof, of statutes,  legal and
          governmental   proceedings  and  contracts  and  other  documents  are
          accurate in all material  respects and fairly present the  information
          purported to be given.

    (xix) The Registration Statement is effective under the 1933 Act and, to the
          best of our  knowledge,  no  proceedings  for a stop  order  have been
          instituted or are pending or threatened under Section 8(d) of the 1933
          Act; and, at the time the Registration  Statement became effective and
          at the date of

                                    B-4





          the Agreement,  the Registration Statement complied,  and, at the date
          hereof,  the Prospectus,  as it may have been amended or supplemented,
          complies, as to form in all material respects with the requirements of
          the 1933 Act and the applicable  instructions,  rules and  regulations
          thereunder,  or pursuant to said  instructions,  rules and regulations
          are deemed to have complied or to comply therewith, although we do not
          express  any opinion as to the  financial  statements  (including  the
          notes  thereto) or other  financial or  statistical  data  included or
          incorporated by reference therein.

      We do not  know  of any  legal  or  governmental  proceeding  (pending  or
threatened)  required  to be  described  in the  Registration  Statement  or the
Prospectus,  as  amended  or  supplemented  to the  date  hereof,  which  is not
described as required,  nor of any contract or document of a character  required
to be described in the Registration  Statement or the Prospectus,  as amended or
supplemented  to the  hereof,  or to be filed as an exhibit to the  Registration
Statement which is not described or filed as required.

      In connection with this opinion,  we have participated in discussions with
officers  and   representatives  of  the  Company,  in  certain  of  which  your
representatives  and counsel also  participated  and at which the affairs of the
Company and the contents of the  Registration  Statement and the Prospectus were
discussed.  There is no  assurance  that all possible  material  facts as to the
Company  were  disclosed to us or that our  familiarity  with the Company or the
operations  in which it is engaged is such that we have  necessarily  recognized
the materiality of such facts as were  disclosed,  and we have to a large extent
relied upon statements of officers and  representatives of the Company as to the
significance  of those facts disclosed to us. We are not passing upon and do not
assume any  responsibility  for the  accuracy,  completeness  or fairness of the
statements contained in the Registration  Statement and the Prospectus except to
the limited extent referred to in paragraphs (xvi) and (xviii) above. Subject to
the foregoing, and to the other limitations and qualifications expressed in this
letter,  we may state that nothing has come to our attention  that would lead us
to believe that the Registration Statement,  when it became effective [or, if an
amendment to the  Registration  Statement  or an Annual  Report on Form 10-K has
been filed by the Company with the SEC  subsequent to the  effectiveness  of the
Registration  Statement,  then at the time such amendment became effective or at
the time of the most recent such filing,  as the case may be,] or at the date of
the  Agreement,  contained an untrue  statement of a material fact or omitted to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not  misleading,  or that the  Prospectus at the date of the
Agreement  or at the date  hereof,  [or,  if the opinion is being  delivered  in
connection  with the purchase of Notes from the Company by one or more Agents as
principal  pursuant  to  Section  7(b)  of the  Agreement,  at the  date  of any
agreement  by such Agent or Agents to  purchase  Notes as  principal  and at the
Settlement Date with respect thereto,  as the case may be,] included or includes
an untrue statement of a material fact or omitted, or omits, to state a material
fact  necessary  in order to make the  statements  therein,  in the light of the
circumstances under which they were made, not misleading;  provided,  that we do
not  express  any belief as to the  financial  statements  (including  the notes
thereto) or other  financial or statistical  data contained or  incorporated  by
reference in the Registration  Statement or the Prospectus,  or any amendment or
supplement  thereto,  as to any information  contained  therein furnished to the
Company in writing by any Agent expressly for use therein or as to the Statement
of Eligibility.

      This opinion is limited to the laws of the State of New York and the State
of Colorado and the federal law of the United States of America. In addition, we
are not opining  herein with respect to the securities or "blue sky" laws of any
state.  Finally,  this opinion  speaks as of the date hereof and we undertake no
responsibility  to  advise  you of any  change in  circumstances  after the date
hereof.

      First Trust of New York, National Association is hereby authorized to rely
upon this  letter as if this letter were  addressed  to it.  Brown & Wood LLP is
hereby  authorized to rely upon this letter as to matters governed by the law of
the State of Colorado as if this letter were  addressed to them.  This letter is
not being  delivered  for the  benefit  of,  nor may it be relied  upon by,  the
holders  of the  Notes  or any  other  party  to  which  it is not  specifically
addressed or to which reliance has not expressly been permitted hereby.

                                                               Very truly yours,



                                    B-5





                                                                  Appendix III
                                                                       to
                                                                  Distribution
                                                                    Agreement


                       [LETTERHEAD OF BROWN & WOOD LLP]
                    Re:  Public Service Company of Colorado



[Agents]
Ladies and Gentlemen:

      We  have  acted  as your  counsel  in  connection  with  the  transactions
contemplated  by  the  Distribution   Agreement,   dated   ______________   (the
"Agreement"),  between you and Public  Service  Company of Colorado,  a Colorado
corporation  (the  "Company"),  in connection  with the issuance and sale by the
Company  of 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"), being issued under its Indenture, dated as of October 1, 1993, to
First Trust of New York,  National  Association,  as successor trustee to Morgan
Guaranty  Trust  Company of New York  (formerly  Guaranty  Trust  Company of New
York),  and all  indentures  supplemental  thereto,  including the  Supplemental
Indenture  dated as of November 1, 1996  creating  the Notes (the  "Supplemental
Indenture")  (said  Indenture  dated as of  October  1, 1993 and all  indentures
supplemental  thereto  being  hereinafter   collectively   referred  to  as  the
"Indenture").

      We have  examined  such  documents  and records as we deemed  appropriate,
including the following:

     (1)  copy,  certified by the Secretary of State of the State of Colorado to
          be  a  true  and  complete   copy,   of  the   Restated   Articles  of
          Incorporation,  as amended,  and the  Certificate of Correction of the
          Company  as on file in the  office  of the  Secretary  of State of the
          State of Colorado;

     (2)  certificate  of recent date of the  Secretary of State of the State of
          Colorado to the effect that the Company is in good standing;

     (3)  copy,  certified by an Assistant Secretary of the Company to be a true
          and correct copy, of the By-Laws of the Company;

     (4)  minute book records of the Company as furnished to us by the Company;

     (5)  executed counterpart of the Agreement;

     (6)  executed counterpart of the Indenture;

     (7)  copies of papers  delivered  by the Company to the  Trustee  under the
          Indenture in connection with the authentication and delivery from time
          to time of the Notes;

     (8)  a specimen Note in definitive fully  registered form,  certified by an
          Assistant Secretary of the Company to be a true and correct specimen;

     (9)  executed counterparts of the Company's Indenture, dated as of December
          1, 1939 (the  "Original  PSCO 1939  Mortgage"),  to First Trust of New
          York,  National  Association,  as successor trustee to Morgan Guaranty
          Trust  Company of New York  (formerly  Guaranty  Trust  Company of New
          York),  and  all  indentures   supplemental  thereto,   including  the
          supplemental  indenture  dated as of  November 1, 1996 (the "PSCO 1939
          Mortgage   Supplemental   Indenture")  creating  the  Company's  first
          mortgage bonds to be made the basis of the authentication and delivery
          of the Notes (the

                                    C-1





          "Class A Bonds") (the Original  PSCO 1939 Mortgage and all  indentures
          supplemental   thereto  being   hereinafter   called  the  "PSCO  1939
          Mortgage");

     (10) copies of papers  delivered  by the Company to the  trustee  under the
          PSCO 1939 Mortgage in connection with the  authentication and delivery
          of the Class A Bonds;

     (11) a specimen Class A Bond in definitive fully registered form, certified
          by an  Assistant  Secretary  of the  Company to be a true and  correct
          specimen;

     (12) copies,  certified by an Assistant Secretary of the Company to be true
          and correct  copies,  of certain  resolutions  adopted by the Board of
          Directors of the Company [and by the Executive  Committee of the Board
          of Directors of the Company] relating to the authorization,  execution
          and  delivery  of  the  Supplemental  Indenture,   the  authorization,
          execution  and  delivery  of  the  PSCO  1939  Mortgage   Supplemental
          Indenture, with respect to the authorization, issuance and sale of the
          Notes, including the Agreement, and with respect to the authorization,
          issuance and delivery of the Class A Bonds;

     (13) executed  copies of the Company's  registration  statement on Form S-3
          (Registration  File  No.  333-_____)  filed  by the  Company  with the
          Securities and Exchange Commission (the "Commission")  pursuant to the
          Securities  Act of 1933, as amended (the "1933 Act"),  relating to the
          registration  thereunder  of first  collateral  trust bonds  having an
          aggregate principal amount not exceeding  $400,000,000,  including the
          Notes.  The terms  "Registration  Statement" and "Prospectus" are used
          herein with the meanings ascribed thereto in the Agreement;

     (14) evidence of the effectiveness of the Registration  Statement under the
          1933 Act; and

     (15) a copy,  certified by the Secretary of The Public Utilities Commission
          of the State of Colorado (the "Colorado  Commission") to be a true and
          complete  copy,  of the Decision and Order of the Colorado  Commission
          adopted October 16, 1996, which authorizes the issuance and sale of up
          to  $650,000,000  aggregate  principal  amount of the Company's  first
          collateral  trust bonds,  including the Notes,  and the same principal
          amount of Class A Bonds.

            In rendering our opinion,  we have assumed,  without any independent
      investigation or verification, the authenticity of all documents submitted
      to us as  originals  and  the  conformity  to  original  documents  of all
      documents  submitted to us as certified,  conformed or photostatic copies,
      and the authenticity of all such latter documents.

            Based upon the foregoing,  and subject to the  assumptions set forth
      herein, we are of the opinion that:

          (a)  The Company has been duly incorporated and is validly existing as
               a  corporation  in good  standing  under the laws of the State of
               Colorado with  corporate  power and  authority to own,  lease and
               operate its  properties  and to conduct its business as described
               in the Prospectus, as amended or supplemented to the date hereof.

          (b)  The Indenture has been duly and validly authorized,  executed and
               delivered by the Company and  (assuming  the  Indenture  has been
               duly   authorized,   executed  and   delivered  by  the  Trustee)
               constitutes a legal,  valid and binding  mortgage of the Company,
               enforceable in accordance  with its terms,  except as enforcement
               thereof may be limited by laws and principles of equity affecting
               generally the  enforcement  of mortgagees'  and other  creditors'
               rights,  including without  limitation  bankruptcy and insolvency
               laws and state  laws  which  affect  the  enforcement  of certain
               remedial provisions of the Indenture.

          (c)  The Indenture is qualified under the Trust Indenture Act of 1939,
               as amended.


                                    C-2





          (d)  The Notes are in due and proper form and the issuance and sale of
               the  Notes  by the  Company  have  been  duly  authorized  by all
               necessary  corporate  action,  and  when a  Note  has  been  duly
               executed and  authenticated as specified in the Indenture and the
               Company Order and Officer's  Certificate  (each as defined in the
               Indenture)  applicable to such Note and delivered against payment
               of the consideration  therefor  determined in accordance with the
               Agreement,   such  Note  will  be  a  legal,  valid  and  binding
               obligation of the Company enforceable  (subject to the exceptions
               and   limitations   referred  to  in  paragraph  (b)  hereof)  in
               accordance  with its  terms  and  entitled  to the  benefits  and
               security of the Indenture;  and such Note will be secured equally
               and ratably with all other Notes and bonds  outstanding under the
               Indenture.

          (e)  The PSCO  1939  Mortgage  has been duly and  validly  authorized,
               executed and delivered by the Company and (assuming the PSCO 1939
               Mortgage has been duly authorized,  executed and delivered by the
               trustee  thereunder)  constitutes  a  legal,  valid  and  binding
               mortgage  of the  Company,  enforceable  in  accordance  with its
               terms,  except as enforcement  thereof may be limited by laws and
               principles  of equity  affecting  generally  the  enforcement  of
               mortgagees'  and  other  creditors'  rights,   including  without
               limitation  bankruptcy and  insolvency  laws and state laws which
               affect the enforcement of certain remedial provisions of the PSCO
               1939 Mortgage.

          (f)  The Class A Bonds are in due and proper form and the issuance and
               delivery  of the  Class A Bonds by the  Company  have  been  duly
               authorized  by all  necessary  corporate  action;  and when (a) a
               Class A Bond has been duly executed,  authenticated and delivered
               to the Trustee as  specified  in the PSCO 1939  Mortgage  and the
               order of an officer  of the  Company  applicable  to such Class A
               Bond  and (b)  the  related  Note  has  been  duly  executed  and
               authenticated as specified in the Indenture and the Company Order
               and Officer's  Certificate  applicable to such Note and delivered
               against  payment  of the  consideration  therefor  determined  in
               accordance with the Agreement, such Class A Bond will be a legal,
               valid and binding obligation of the Company enforceable  (subject
               to the  exceptions and  limitations  referred to in paragraph (e)
               hereof) in accordance with its terms and entitled to the benefits
               and  security  of the PSCO 1939  Mortgage;  and such Class A Bond
               will  be  secured  equally  and  ratably  with  all  other  bonds
               outstanding  under the PSCO 1939  Mortgage  (except to the extent
               that any  sinking,  amortization,  improvement  or other fund may
               afford  additional  security  for such  bonds  of any  particular
               series).

          (g)  The Agreement has been duly authorized, executed and delivered by
               the Company.

          (h)  The issuance and sale of the Notes, and the issuance and delivery
               of the Class A Bonds,  have been duly  authorized and approved by
               the  Colorado  Commission;  no further  approval,  authorization,
               consent or other order of any public board or body (other than in
               connection or compliance  with the  provisions of the  securities
               laws of any  jurisdiction)  is legally  required for the issuance
               and sale by the Company of the Notes pursuant to the Agreement or
               for the  issuance  and  delivery  of the  Class A Bonds;  and the
               Company is  presently  exempt from all of the  provisions  of the
               Public Utility  Holding  Company Act of 1935, as amended,  except
               Section 9(a)(2) thereof.

          (i)  The  Notes,  the  Indenture,  the Class A Bonds and the PSCO 1939
               Mortgage  conform as to legal matters to the  description  of the
               terms  thereof  contained in the  Registration  Statement and the
               Prospectus, as amended or supplemented to the date hereof.

          (j)  The  Registration  Statement is effective under the 1933 Act and,
               to the best of our  knowledge,  no  proceedings  for a stop order
               have been  instituted or are pending or threatened  under Section
               8(d) of the 1933 Act; and, at the time the Registration Statement
               became   effective  and  at  the  date  of  the  Agreement,   the
               Registration Statement complied,

                                    C-3





               and,  at the date  hereof,  the  Prospectus,  as it may have been
               amended or  supplemented,  complies,  as to form in all  material
               respects with the requirements of the 1933 Act and the applicable
               instructions,  rules and regulations  thereunder,  or pursuant to
               said  instructions,  rules  and  regulations  are  deemed to have
               complied or to comply  therewith,  although we do not express any
               opinion  as to the  financial  statements  (including  the  notes
               thereto)  or other  financial  or  statistical  data  included or
               incorporated by reference therein.

      We  have  endeavored  to see  that  the  Registration  Statement  and  the
Prospectus,  and any amendment or supplement  thereto,  comply with the 1933 Act
and  the  rules  and  regulations  of  the  Commission  thereunder  relating  to
registration  statements  on Form  S-3  and  related  prospectuses,  but we have
participated  to a  limited  extent  only in the  preparation  of the  documents
incorporated  by reference in the  Registration  Statement and Prospectus and we
cannot,  of  course,  make  any  representation  to you as to  the  accuracy  or
completeness  of statements of fact contained in the  Registration  Statement or
Prospectus,  including the documents incorporated therein by reference. Nothing,
however,  has come to our  attention  that  would  lead us to  believe  that the
Registration  Statement, at the time it became effective [or, if an amendment to
the  Registration  Statement or an Annual  Report on Form 10-K has been filed by
the  Company  with  the  Commission  subsequent  to  the  effectiveness  of  the
Registration  Statement,  then at the time such amendment became effective or at
the time of the most recent such  filing,  as the case may be] or at the date of
the  Agreement,  contained an untrue  statement of a material fact or omitted to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not  misleading  or that the  Prospectus  at the date of the
Agreement  or at the date  hereof  [or,  if the  opinion is being  delivered  in
connection  with the purchase of Notes from the Company by one or more Agents as
principal  pursuant  to  Section  7(b)  of the  Agreement,  at the  date  of any
agreement  by such Agent or Agents to  purchase  Notes as  principal  and at the
Settlement Date with respect thereto,  as the case may be], included or includes
an untrue  statement of a material  fact or omitted or omits to state a material
fact  necessary  in order to make the  statements  therein,  in the light of the
circumstances  under which they were made, not  misleading;  provided that we do
not express any belief as to the  financial  statements  or other  financial  or
statistical  data  contained or  incorporated  by reference in the  Registration
Statement or the Prospectus,  or any amendment or supplement  thereto,  or as to
the Statement of Eligibility.

      In giving  this  opinion  we have  relied as to all  matters  governed  by
Colorado law upon the opinion of even date herewith  rendered to you by LeBoeuf,
Lamb, Greene & MacRae,  L.L.P. relating to the Notes. We express no opinion upon
matters regarding titles to properties of the Company, the lien of the Indenture
or the filing or the recordation  thereof, the lien of the PSCO 1939 Mortgage or
the filing or the recordation thereof, or of the validity and sufficiency of the
franchises, licenses and permits of the Company in carrying on its business.



                                          Very truly yours,



                                    C-4





                                                                   Appendix IV
                                                                       to
                                                                  Distribution
                                                                    Agreement



                   CONTENTS OF LETTER OF ARTHUR ANDERSEN LLP



      The letter of Arthur  Andersen LLP will confirm that they are  independent
public  accountants  within  the  meaning  of the  1933  Act  and the  1933  Act
Regulations, and will state in effect that:

     (a)  in their opinion, the consolidated financial statements and supporting
          financial  schedules  audited by them and incorporated by reference in
          the Registration  Statement comply as to form in all material respects
          with the applicable  accounting  requirements  of the 1933 Act and the
          1934 Act and the applicable respective published rules and regulations
          thereunder;

     (b)  on the basis of a limited review (but not an audit in accordance  with
          generally accepted auditing  standards) of the unaudited  consolidated
          condensed  financial  statements,  if any,  included in the  documents
          incorporated  by  reference  in  the  Prospectus  and  of  the  latest
          available interim consolidated  financial statements of the Company, a
          reading of all recent minutes of meetings of the Board of Directors of
          the Company and the  Executive  and Audit  Committees  thereof (or for
          meetings for which minutes had not yet been prepared, discussions with
          a Company officer of the actions taken thereat),  of the  shareholders
          of the Company and of the  shareholders and Boards of Directors of the
          Company's consolidated subsidiaries,  and discussions with officers of
          the Company  responsible for financial and accounting matters and such
          other  inquiries  and  procedures  as may be specified in such letter,
          nothing came to their attention which caused them to believe that:

          (i)  the unaudited  consolidated  condensed financial  statements,  if
               any,  included in the documents  incorporated by reference in the
               Prospectus do not comply as to form in all material respects with
               the applicable  accounting  requirements  of the 1934 Act and the
               related  published  1934 Act  Regulations,  or said  consolidated
               condensed  financial   statements  are  not  in  conformity  with
               generally  accepted  accounting  principles  applied  on a  basis
               substantially  consistent  with that of the audited  consolidated
               financial statements incorporated by reference therein,

          (ii) the unaudited income statement and balance sheet amounts, if any,
               included  in  the  Prospectus  were  not  determined  on a  basis
               substantially  consistent with the audited  financial  statements
               included therein, or

         (iii) (A)  there was any  change  in the  consolidated  capital  stock,
                    other  than  ongoing  sales  under the  Company's  Automatic
                    Dividend Reinvestment and Common Stock Purchase Plan, or any
                    increase  in the  long-term  debt  of the  Company  and  its
                    consolidated  subsidiaries,  or any decrease in consolidated
                    net  assets,  at a  specified  date not more than three days
                    prior  to the  date of such  letter  as  compared  with  the
                    corresponding  amounts shown in the most recent consolidated
                    balance  sheet or condensed  balance sheet  incorporated  by
                    reference in the Prospectus, or

               (B)  there was any decrease in consolidated operating revenues or
                    net  income  for the  period  from  the  date of the  latest
                    consolidated   balance  sheet  or  condensed  balance  sheet
                    incorporated  by reference in the  Prospectus to a specified
                    date not

                                    D-1





                    later than  three  days prior to the date of such  letter as
                    compared to such amounts for the corresponding period during
                    the previous year,

               except in all instances for changes, increases or decreases which
               the Prospectus  discloses have occurred or may occur or which are
               disclosed in such letter;

      (c)   they have carried out certain  procedures and made certain findings,
            specified  in such  letter,  with  respect  to certain  amounts  and
            percentages   included   in  the   Prospectus   and  the   documents
            incorporated  by reference in the Prospectus and such other items as
            the Agents may reasonably request.


                                    D-2







                                                                      APPENDIX V



                                          ____________________, 19__

[Agents]

Re:   Public Service Company of Colorado Secured Medium-Term Notes

Dear Sirs:

      We have  delivered  an opinion to you dated  ______________  as counsel to
Public Service Company of Colorado (the "Company"),  pursuant to Section 5(b) of
the Distribution Agreement, dated as of ____________, among the Company and you,
as Agents.  You may continue to rely upon such opinion as if it were dated as of
this date except that all  statements  and opinions  contained  therein shall be
deemed to relate to the  Registration  Statement  and  Prospectus as amended and
supplemented to this date.

      This  letter  is  delivered  to  you  pursuant  to  Section  6(b)  of  the
Distribution Agreement.

                                          Very truly yours,

                                       V-1