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:   Southwestern Public Service Company

      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 notes - standby credit
     agreement
2.   Issue, renewal or guaranty:   renewal
3.   Principal amount of each security:   $45,140,068.50
4.   Rate of interest  per annum of each  security:  Any Base Rate  advance from
     time to time  outstanding  shall bear  interest at a varying rate per annum
     equal to the  lesser of (a) the  highest  Lawful  Rate or (b) the Base Rate
     from the date of such Base Rate Advance until maturity. Any Eurodollar Rate
     Advance  from time to time  outstanding  shall bear  interest at a rate per
     annum  equal  to the  lesser  of (a)  the  Highest  Lawful  Rate or (b) the
     Eurodollar  Rate  applicable  to such Interest  Period plus the  Applicable
     Margin.
5.   Date of issue, renewal or guaranty of each security:   June 29, 1998
6.   If renewal of security, give date of original issue:  July 1, 1991
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:
     UBS AG New York Branch
9.   Collateral given with each security, if any:  none
10.  Consideration received for each security:  $45,140,068.50
11.  Application of proceeds of each security: The proceeds of the Advances made
     under the Standby Credit  Agreement  shall be used by  Southwestern  Public
     Service Company only to purchase Bonds (other than Bonds subject to a Fixed
     Rate) which have been tendered for purchase  pursuant to Section  602(a) of
     the Bond Indenture.  Under no circumstances may proceeds of the Advances be
     used for the  purchase  or  payment of Bonds  which  have been  accelerated
     pursuant to the provisions of Article 1002 of the Bond Indenture.

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

                                    Southwestern Public Service Company


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

Date: August 5, 1998