SECURITIES AND EXCHANGE COMMISSION
                                Washington, D. C.
                                   FORM U-6B-2
                           Certificate of Notification

      Filed by a registered  holding company or subsidiary  thereof  pursuant to
Rule U-20-(d) [Reg.  Section  250.20,  Paragraph  36,652] or U-47 [Reg.  Section
250.47,  Paragraph  36,620] adopted under the Public Utility Holding Company Act
of 1935

Certificate is filed by:   Public Service Company of Colorado

      This  certificate  is notice  that the above  named  company  has  issued,
renewed or guaranteed the security or securities  described  herein which issue,
renewal or guaranty was exempted from the  provisions of Section 6(a) of the Act
and was neither  the subject of a  declaration  or  application  on Form U-1 nor
included  within  the  exemption  provided  by Rule U-48 [Reg.  Section  250.48,
Paragraph 36,621].

1. Type of the security or securities:  unsecured promissory notes issued 
   pursuant to a credit agreement
2. Issue, renewal or guaranty:   renewal
3. Principal amount of each security: up to $150 million at any time outstanding
4. Rate of interest per annum of each  security:  The  interest  rate for a base
   rate loan is the greater of (a) the rate of interest publicly announced  from
   time to time by Bank of America in San Francisco,  California as its 
   "reference rate" and (b) 1/2 of 1% plus the latest  Federal Funds Rate.  The
   interest rate for fixed rate loans shall mean, a rate per annum determined by
   the Agent bank to be equal to (a) in the case of a CD Loan,  the sum of 
   (i) the Fixed Base Rate for such Loan for the  Interest  Period for such Loan
   divided by 1 minus the Reserve  Requirement  for such Loan for such  Interest
   Period  plus (ii) the Assessment  Rate for such Interest Period and (b) in 
   the case of a Eurodollar Loan, the Fixed  Base Rate for such Loan for the
   Interest  Period  for such Loan.
5. Date of issue,  renewal or  guaranty  of each  security:  June 26, 1998
6. If renewal of  security,  give date of  original  issue:  April 30, 1997 
7. Date of maturity of each security: less than 364 days
8. Name of the person to whom each security was issued, renewed or guaranteed:
   Bank of America National  Trust  and  Savings  Association;  NationsBank,
   National Association; First Chicago Capital Markets, Inc.; JP Morgan; CIBC
   Oppenheimer Corp.
9. Collateral given with each security, if any:  none
10.Consideration received for each security:  up to $150 million
11.Application of proceeds of each security: Proceeds of the Loans shall be used
   solely for proper  corporate  purposes  (including the payment of interest on
   the Loans prior to the Termination Date).
12.Indicate by a check after the applicable statement below whether the issue, 
   renewal or guaranty of each security was exempt from the provisions of
   Section 6(a) because of:



   a) the provisions contained in the first sentence of Section 6(b): 
       Not applicable
   b) the provisions contained in the fourth sentence of Section 6(b):  Not
      applicable
   c) the provisions contained in any rule of the commission other than Rule
      U-48:    X

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13.If the  security or  securities  were exempt from the  provisions  of Section
   6(a) by virtue of the first sentence of Section 6(b),  give the figures which
   indicate that the security or securities  aggregate  (together with all other
   than  outstanding  notes and  drafts of a  maturity  of nine  months or less,
   exclusive  of days of  grace,  as to  which  such  company  is  primarily  or
   secondarily  liable) not more than 5 per centum of the  principal  amount and
   par value of the other securities of such company then  outstanding.  (Demand
   notes,  regardless  of how  long  they may have  been  outstanding,  shall be
   considered  as  maturing  in not more than nine  months for  purposes  of the
   exemption  from  Section  6(a) of the Act  granted by the first  sentence  of
   Section 6(b)).
       Not applicable.
14.If the security or securities  are exempt from the provisions of Section 6(a)
   because of the fourth sentence of Section 6(b), name the security outstanding
   on January 1, 1935, pursuant to the terms of which the security or securities
   herein described have been issued.
       Not applicable.
15.If the security or securities  are exempt from the provisions of Section 6(a)
   because of any rule of the  Commission  other  than Rule U-48  [Reg.  Section
   250.48,  Paragraph  36,621]  designate  the rule  under  which  exemption  is
   claimed.
      Rule 52

                                    Public Service Company of Colorado


                                    By: /s/ James D. Steinhilper
                                           James D. Steinhilper
                                              Treasurer

Date: August 5 , 1998