EXHIBIT A to
                                                     1996 SUPPLEMENTAL INDENTURE



                               1996 REFUNDING NOTE
                             (DUE JANUARY 15, 2014)


                   THIS NOTE HAS NOT BEEN REGISTERED UNDER THE
               SECURITIES ACT OF 1933 AND MAY NOT BE TRANSFERRED,
                SOLD OR OFFERED FOR SALE IN VIOLATION OF SUCH ACT

               NONRECOURSE PROMISSORY NOTE, 1996 REFUNDING SERIES
                             (DUE JANUARY 15, 2014)

                          Issued at: New York, New York

                         Issue Date: As of July 15, 1996


             STATE  STREET  BANK  AND  TRUST  COMPANY,  not  in  its  individual
capacity,  but solely as Owner Trustee (Owner  Trustee) under a Trust  Agreement
dated as of December 16, 1985 with MFS LEASING  CORP.  (the Owner  Participant),
hereby  promises to pay to PUBLIC SERVICE  COMPANY OF NEW MEXICO,  or registered
assigns,  the principal sum of $32,256,000 (Thirty Two Million Two Hundred Fifty
Six Thousand  Dollars) on January 15, 2014 together  with interest  (computed on
the basis of a 360-day year of twelve 30- day months) on the aggregate amount of
such  principal  sum  remaining  unpaid from time to time from the Issue Date of
this 1996  Refunding  Note until due and  payable,  in  arrears,  at the rate of
10.30% per annum. Payments of principal installments of this 1996 Refunding Note
shall be made in the  "principal  amount  payable"  and on the  "payment  dates"
specified  in Schedule 1 hereto,  as such  Schedule  may be revised from time to
time in accordance with the Indenture and the terms contained  herein.  Payments
of accrued  interest on this 1996 Refunding Note shall be made on January 15 and
July 15 in each year,  commencing  January 15, 1997,  to and  including the last
"payment date" specified in Schedule 1 hereto.

             Capitalized  terms used in this 1996  Refunding  Note which are not
otherwise  defined  herein  shall  have the  meanings  ascribed  thereto  in the
Indenture (as hereinafter defined).

             Interest on any overdue principal and premium,  if any, and (to the
extent  permitted by  applicable  law) any overdue  interest,  shall be paid, on
demand,  from  the due  date  thereof  at the rate  per  annum  equal to  11.30%
(computed on the basis of a 360-day year of twelve 30-day months) for the period
during which any such principal, premium or interest shall be overdue.


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                                   Page III-10





             In the  event any date on which a  payment  is due under  this 1996
Refunding  Note is not a Business Day,  then payment  thereof may be made on the
next  succeeding  Business  Day with the same force and effect as if made on the
date on which such payment was due.

             All payments of principal, premium, if any, and interest to be made
by the Owner Trustee hereunder and under the Trust Indenture, Mortgage, Security
Agreement and  Assignment of Rents dated as of December 16, 1985, as at any time
heretofore  or  hereafter   amended  or  supplemented  in  accordance  with  the
provisions  thereof  (the  Indenture),  between the Owner  Trustee and The Chase
Manhattan Bank (formerly  known as "Chemical  Bank"),  as trustee (the Indenture
Trustee),  shall be made  only  from the Lease  Indenture  Estate  and the Trust
Estate,  and the  Indenture  Trustee  shall have no  obligation  for the payment
thereof  except to the extent that the Indenture  Trustee shall have  sufficient
income or  proceeds  from the Lease  Indenture  Estate to make such  payments in
accordance with the terms of Article V of the Indenture.  The Holder hereof,  by
its  acceptance of this 1996 Refunding  Note,  agrees that such Holder will look
solely to the Trust Estate and the income and proceeds from the Lease  Indenture
Estate to the extent  available for  distribution  to the Holder hereof as above
provided,  and that  neither  the Owner  Participant  nor,  except as  expressly
provided in the  Indenture,  the Owner Trustee nor the  Indenture  Trustee is or
shall be personally  liable to the Holder  hereof for any amounts  payable under
this  1996  Refunding  Note or for any  performance  to be  rendered  under  the
Indenture or any other  Transaction  Document or for any  liability  thereunder;
provided, however, that in the event the Lessee shall assume all the obligations
of the Owner  Trustee  hereunder  and under the  Indenture  pursuant  to Section
3.9(b)  of the  Indenture,  then all the  payments  to be made  under  this 1996
Refunding  Note shall be made only from  payments  made by the Lessee under this
1996 Refunding Note in accordance with the Assumption  Agreement  referred to in
said Section  3.9(b) and the Holder of this 1996  Refunding  Note agrees that in
such event it will look solely to the Lessee for such payment.

             The Holder hereof,  by its acceptance of this 1996 Refunding  Note,
agrees that each payment received by it hereunder shall be applied in the manner
set forth in Section 3.11 of the  Indenture.  The Holder of this 1996  Refunding
Note agrees,  by its  acceptance  hereof,  that it will duly note by appropriate
means all payments of principal or interest  made hereon and that it will not in
any event  transfer or otherwise  dispose of this 1996 Refunding Note unless and
until all such notations have been duly made.

             This 1996  Refunding Note is the 1996 Refunding Note referred to in
the Indenture. The Indenture permits the issuance of additional series of Notes,
as provided in Section 3.5 of the  Indenture,  and the several series may be for
varying  aggregate  principal  amounts and may have  different  maturity  dates,
interest

                                                                      [3][MFS-1]

                                   Page III-11





rates,  redemption  provisions  and other  terms.  The  properties  of the Owner
Trustee  included in the Lease  Indenture  Estate are  pledged to the  Indenture
Trustee to the extent  provided in the  Indenture as security for the payment of
the principal of and premium,  if any, and interest on this 1996  Refunding Note
and all  other  Notes  issued  and  outstanding  from  time to  time  under  the
Indenture.  Reference  is hereby made to the  Indenture  for a statement  of the
rights of the Holders of, and the nature and extent of the  security  for,  this
1996  Refunding  Note and of the  rights  of,  and the  nature and extent of the
security for, the Holders of the other Notes and of certain  rights of the Owner
Trustee,  as well as for a statement  of the terms and  conditions  of the trust
created by the Indenture, to all of which terms and conditions the Holder hereof
agrees by its acceptance of this 1996 Refunding Note.

             This 1996  Refunding  Note is  subject  to  prepayment  in whole as
contemplated  by Section 5.2 of the Indenture and in the  circumstances  therein
described. In addition, this 1996 Refunding Note may, at the option of the Owner
Trustee,  be prepaid in whole or in part at any time by the Owner  Trustee  upon
the giving by the Owner  Trustee of not less than two days'  notice (as provided
in the  Indenture)  and at  the  following  prepayment  prices  (expressed  as a
percentage  of the unpaid  principal  amount  hereof),  together  with  interest
accrued to the date fixed for prepayment:

  Twelve Month                                                Redemption
Period Beginning                                                  Price

January 15, 1996                                               106.180%
January 15, 1997                                               105.768
January 15, 1998                                               105.356
January 15, 1999                                               104.944
January 15, 2000                                               104.532
January 15, 2001                                               104.120
January 15, 2002                                               103.708
January 15, 2003                                               103.296
January 15, 2004                                               102.884
January 15, 2005                                               102.472
January 15, 2006                                               102.060
January 15, 2007                                               101.648
January 15, 2008                                               101.236
January 15, 2009                                               100.824
January 15, 2010                                               100.412



and thereafter at the principal  amount thereof,  together with interest accrued
to the date fixed for  prepayment.  This 1996  Refunding  Note is not  otherwise
subject to optional prepayment in whole or in part.


                                                                      [3][MFS-1]

                                   Page III-12





             In  case  an  Indenture   Event  of  Default  shall  occur  and  be
continuing,  the unpaid balance of the principal of this 1996 Refunding Note and
any other Notes,  together with all accrued but unpaid  interest  thereon,  may,
subject  to  certain  rights  of the  Owner  Trustee  or the  Owner  Participant
contained  or  referred to in the  Indenture,  be declared or may become due and
payable in the manner and with the effect provided in the Indenture.

             The lien  upon the  Lease  Indenture  Estate  is  subject  to being
legally  discharged  prior to the maturity of this 1996  Refunding Note upon the
deposit with the Indenture Trustee of cash or certain  securities  sufficient to
pay this 1996  Refunding Note when due or an assumption of the obligation of the
Owner Trustee under this 1996 Refunding Note and the Indenture,  in each case in
accordance with the terms of the Indenture.

             There  shall be  maintained  at the  Indenture  Trustee's  Office a
register for the purpose of registering  transfers and exchanges of Notes in the
manner  provided in the  Indenture.  The transfer of this 1996 Refunding Note is
registrable, as provided in the Indenture, upon surrender of this 1996 Refunding
Note for  registration of transfer duly  accompanied by a written  instrument of
transfer duly executed by or on behalf of the registered Holder hereof, together
with the amount of any applicable  transfer taxes.  Prior to the due presentment
for  registration of transfer of this 1996 Refunding Note, the Owner Trustee and
the  Indenture  Trustee  may treat the person in whose name this 1996  Refunding
Note is registered as the owner hereof for the purpose of receiving  payments of
principal of and premium,  if any, and interest on this 1996  Refunding Note and
for all other  purposes  whatsoever,  whether or not this 1996 Refunding Note be
overdue,  and  neither  the Owner  Trustee nor the  Indenture  Trustee  shall be
affected by notice to the contrary.

             Principal,  premium,  if any, and interest shall be payable, in the
manner provided in the Indenture,  on presentment of this 1996 Refunding Note at
the Indenture Trustee's Office, or as otherwise provided in the Indenture.

             This 1996  Refunding  Note shall be governed  by, and  construed in
accordance with, the laws of the State of New York.



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                                   Page III-13





             IN  WITNESS  WHEREOF,  the  Owner  Trustee  has  caused  this  1996
Refunding Note to be duly executed as of the date hereof.

                                       STATE STREET BANK AND TRUST
                                         COMPANY, not in its individual
                                         capacity, but solely as Owner
                                         Trustee under a Trust Agreement
                                         dated as of December 16, 1985
                                         with MFS Leasing Corp.


                                       By____________________________
                                         Name:
                                         Title:


             This Note is one of the series of Notes  referred to therein and in
the within-mentioned Indenture.

                                       THE CHASE MANHATTAN BANK,
                                         as Indenture Trustee


                                       By __________________________
                                          Name:
                                          Title:

                                                                      [3][MFS-1]

                                   Page III-14




                                   SCHEDULE 1
                           TO THE 1996 REFUNDING NOTE
                             (DUE JANUARY 15, 2014)

                       Schedule of Principal Amortization

                          $32,256,000 Principal Amount

                Payment              Principal Amount          Principal Amount
                 Date                    Payable                    Paid

January 15, 1997                       $  820,000
July 15, 1997                             863,000
January 15, 1998                          906,000
July 15, 1998                             737,000
January 15, 1999                          536,000
July 15, 1999                             551,000
January 15, 2000                          566,000
July 15, 2000                             582,000
January 15, 2001                          597,000
July 15, 2001                             614,000
January 15, 2002                          631,000
July 15, 2002                             648,000
January 15, 2003                          666,000
July 15, 2003                             684,000
January 15, 2004                          703,000
July 15, 2004                             722,000
January 15, 2005                          741,000
July 15, 2005                             763,000
January 15, 2006                          783,000
July 15, 2006                             804,000
January 15, 2007                          827,000
July 15, 2007                             850,000
January 15, 2008                          871,000
July 15, 2008                             897,000
January 15, 2009                          925,000
July 15, 2009                             946,000
January 15, 2010                          973,000
July 15, 2010                           1,006,000
January 15, 2011                        1,141,000
July 15, 2011                           1,173,000
January 15, 2012                        1,205,000
July 15, 2012                           1,540,000
January 15, 2013                        2,385,000
July 15, 2013                           2,507,000
January 15, 2014                        1,093,000
                                      -----------
Principal Amount                      $32,256,000
                                      ===========