EXHIBIT 4.6.4

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                      PUBLIC SERVICE COMPANY OF NEW MEXICO

                                       TO

                               JPMORGAN CHASE BANK

                                     Trustee



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



                          SIXTH SUPPLEMENTAL INDENTURE

                             Dated as of May 1, 2003

                                       To

                                    INDENTURE

                           Dated as of March 11, 1998



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



                                  Providing for


             2003 Pollution Control Series C Senior Unsecured Notes



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





         SIXTH SUPPLEMENTAL INDENTURE, dated as of May 1, 2003, between PUBLIC
SERVICE COMPANY OF NEW MEXICO, a corporation duly organized and existing under
the laws of the State of New Mexico (the "Company"), having its principal office
at Alvarado Square, Albuquerque, New Mexico 87158, and JPMORGAN CHASE BANK
(formerly known as The Chase Manhattan Bank), a New York banking corporation, as
Trustee (the "Trustee") under the Indenture dated as of March 11, 1998 between
the Company and the Trustee (the "Indenture").

                             RECITALS OF THE COMPANY

         The Company has executed and delivered the Indenture to the Trustee to
provide for the issuance from time to time of its senior notes (the "Notes"),
said Notes to be issued in one or more series as in the Indenture provided.

         The Company has executed and delivered to the Trustee a First
Supplemental Indenture, dated as of March 11, 1998, between the Company and the
Trustee to establish the forms and terms of seven series of Notes, a Second
Supplemental Indenture, dated as of March 11, 1998, between the Company and the
Trustee to establish the forms and terms of three series of Notes, a Third
Supplemental Indenture, dated as of October 1, 1999, between the Company and the
Trustee to establish the forms and terms of one series of Notes, a Fourth
Supplemental Indenture, dated as of May 1, 2003, to establish the forms and
terms of one series of Notes and a Fifth Supplemental Indenture, dated as of May
1, 2003 to establish the forms and terms of one series of Notes (the Indenture,
as supplemented by said First Supplemental Indenture, said Second Supplemental
Indenture, said Third Supplemental Indenture, said Fourth Supplemental Indenture
and said Fifth Supplemental Indenture, collectively, the "Indenture, as
heretofore supplemented").

         Pursuant to the terms of the Indenture, the Company desires to provide
for the establishment of a new series of Notes to be known as its 2003 Pollution
Control Series C Senior Unsecured Notes (the "2003C Notes"), the form and
substance of the 2003C Notes and the terms, provisions, and conditions thereof
to be set forth as provided in the Indenture and this Sixth Supplemental
Indenture.

         The Maricopa County, Arizona Pollution Control Corporation (the
"Authority") has issued its Pollution Control Revenue Refunding Bonds, 2003
Series A (Public Service Company of New Mexico Palo Verde Project) (the
"Refunding Bonds").

         The Authority has appointed Bank of Albuquerque, N.A., as trustee (the
"Refunding Bond Trustee") under the Indenture of Trust and Pledge, dated as of
May 1, 2003 (the "Indenture of Trust"), with respect to the Refunding Bonds.

         Pursuant to the Loan Agreement, dated as of May 1, 2003 (the "Loan
Agreement"), by and between the Authority and the Company, the Authority loaned
(the "Loan") to the Company the proceeds from the issuance of the Refunding
Bonds, and the Company is obligated to make certain payments to the Authority,
which payments the Authority has pledged and assigned to the Refunding Bond
Trustee by the terms of the Indenture of Trust to provide for the payment of
principal and Purchase Price (as defined in the Indenture of Trust) of and
premium, if any, and interest on the Refunding Bonds.

                                       1


         Pursuant to the Loan Agreement, the Company agrees to issue its 2003C
Notes to be delivered to the Refunding Bond Trustee as security for the
performance of the Company's obligation under the Loan Agreement to repay the
Loan in an amount equal to the principal and Purchase Price of, premium, if any,
and interest due on the Refunding Bonds (the "Required Amounts").

         All things necessary to make this Sixth Supplemental Indenture a valid
agreement of the Company, and to make the 2003C Notes, when executed by the
Company and authenticated and delivered by the Trustee, the valid obligations of
the Company, have been done.

          NOW, THEREFORE, THIS SIXTH SUPPLEMENTAL INDENTURE WITNESSETH:

         For and in consideration of the premises and the acceptance of the
2003C Notes by the Refunding Bond Trustee under the Indenture of Trust as
collateral security for the Refunding Bonds, and for the purpose of setting
forth, as provided in the Indenture, the form and substance of the 2003C Notes
and the terms, provisions, and conditions thereof, it is mutually agreed, for
the equal and proportionate benefit of all Holders of the 2003C Notes, as
follows:

                                   ARTICLE ONE

                          GENERAL TERMS AND CONDITIONS
                          ----------------------------
                               OF THE 2003C NOTES
                               ------------------

         SECTION 1.01. There shall be and is hereby authorized a new series of
Notes designated the "2003 Pollution Control Series C Senior Unsecured Notes".
The 2003C Notes shall be limited in aggregate principal amount to $36,000,000.
The 2003C Notes shall mature, and the principal thereof shall be due and payable
together with all accrued and unpaid interest thereon, on January 1, 2038.
Subject to the provisions of Section 1.03 hereof, the 2003C Notes shall bear no
interest until an Initial Interest Accrual Date, if any, has been determined in
accordance with Section 1.03 hereof. The 2003C Notes shall be issued in the form
of registered Notes without coupons, in denominations of $1,000 and any integral
multiple thereof. Each of the 2003C Notes shall be dated as of the date of its
authentication.

         SECTION 1.02. The 2003C Notes shall be issued to and registered in the
name of the Refunding Bond Trustee under the Indenture of Trust and shall be
non-transferable, except as may be required to effect transfer to any successor
trustee to the Refunding Bond Trustee under the Indenture of Trust. Principal
of, and premium, if any, and interest on the 2003C Notes will be payable, and
registration of transfer and exchanges of the 2003C Notes may be effected, and
notices and demands to or upon the Company in respect of the 2003C Notes and the
Indenture, as supplemented from time to time, may be served at the office or
agency of the Company maintained for that purpose in The City and State of New
York, which shall be the Corporate Trust Office of the Trustee. The 2003C Notes
shall be deemed fully paid, and the obligation of the Company thereunder shall
be terminated, to the extent and in the manner provided in Section 1.05 hereof.

                                       2


         SECTION 1.03. The 2003C Notes shall be issued to the Refunding Bond
Trustee to secure the obligations of the Company under the Loan Agreement to pay
the Required Amounts. In the event of failure by the Company to make any payment
of any Required Amounts when and as required by the Company under the Loan
Agreement, the 2003C Notes shall bear interest at the rate or rates of interest
from time to time borne by the Refunding Bonds for the corresponding Rate Period
(as defined in the Indenture of Trust) from the last day to which interest on
the Refunding Bonds has been paid in full prior to the failure of the Company to
pay such Required Amounts (such date being herein defined as the "Initial
Interest Accrual Date"), and interest at such rate or rates shall be payable on
the date or dates as any such interest on the Refunding Bonds shall from time to
time be due and payable in each year (each an "Interest Payment Date"),
commencing on the first Interest Payment Date of the Refunding Bonds following
the Initial Interest Accrual Date, until the principal of the 2003C Notes shall
be paid or made available for payment.

         The Trustee may conclusively presume that no payments with respect to
interest on the 2003C Notes are due unless and until the Trustee shall have
received a written certificate from the Refunding Bond Trustee, signed by an
authorized officer of the Refunding Bond Trustee, certifying that the Company
has failed to make a payment of any Required Amount when and as required to be
made by it under the Loan Agreement and specifying such Required Amount, the
interest rate or rates borne or to be borne by the Refunding Bonds, the Initial
Interest Accrual Date, the Interest Payment Date(s) and such other terms as
shall be applicable to the payment of interest on the 2003C Notes. The Trustee
may rely and shall be fully protected in acting upon any such certificate and
shall have no duty with respect to the terms specified in any such certificate
other than to make them available for inspection by the Company.

         SECTION 1.04. The 2003C Notes shall be redeemed, in whole or in part,
at the principal amount thereof plus any premium, as hereinafter provided, and
any accrued and unpaid interest from the Initial Interest Accrual Date to their
redemption date, if the Refunding Bond Trustee notifies the Trustee in writing
that Refunding Bonds are subject to redemption as provided in Section 3.02 of
the Indenture of Trust. Any such notice must be received by the Trustee no later
than five days (unless a shorter period of time is acceptable to the Trustee)
prior to any redemption date fixed for the Refunding Bonds to be redeemed and
shall specify the principal amount of such Refunding Bonds anticipated as of the
date of such notice to be redeemed, the redemption date, the redemption premium,
if any, and the amount of accrued and unpaid interest anticipated to be paid
thereon. In the event such notice is given to the Trustee as provided above, the
redemption date of the 2003C Notes shall be the date on which the Refunding
Bonds are fixed for redemption, and on such date the said 2003C Notes shall
become due and payable in the same principal amount as the Refunding Bonds in
fact redeemed pursuant to Section 3.01 of the Indenture of Trust. The redemption
price payable in respect of the 2003C Notes shall include a premium in the event
(and only in the event) that any redemption premium is payable in respect of the
corresponding Refunding Bonds in fact redeemed pursuant to Section 3.01 of the
Indenture of Trust, and, in such event, the amount of such premium in respect of
the redemption price of the 2003C Notes shall be an amount equal to the
redemption premium so payable in respect of such Refunding Bonds. The Company

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shall deposit in trust with the Trustee on the redemption date an amount of
money sufficient to pay the principal amount, plus any premium and accrued and
unpaid interest, if any, to the date fixed for redemption on the 2003C Notes to
be redeemed (the "Redemption Price"). Upon presentation to the Trustee of any of
the 2003C Notes by the Refunding Bond Trustee for payment of the Redemption
Price, such 2003C Notes so presented shall be redeemed and paid in full.
However, if, in lieu of presenting the 2003C Notes due for redemption, the
Refunding Bond Trustee shall deliver such 2003C Notes to the Trustee for
cancellation, then, and in that event, subject to Section 1.05 hereof, such of
the 2003C Notes so presented for cancellation shall be deemed fully paid, and if
any monies shall have been deposited with the Trustee for such redemption, then
such moneys shall be paid over to the Company, and the 2003C Notes so presented
for cancellation shall be canceled in accordance with Section 1.05 hereof.

         SECTION 1.05 Upon surrender by the Refunding Bond Trustee or the
Company to the Trustee hereunder of any of the 2003C Notes for cancellation,
such Notes shall be canceled by the Trustee and delivered to the Company and
shall be deemed fully paid and the obligations of the Company thereunder
terminated.

         SECTION 1.06 The 2003C Notes shall be defeasible pursuant to Section
13.02 and Section 13.03 of the Indenture.

                                   ARTICLE TWO

                             FORM OF THE 2003C NOTES
                             -----------------------

         SECTION 2.01. The 2003C Notes and the Trustee's certificate of
authentication to be endorsed thereon are to be substantially in the following
form:

         Pursuant to Section 1.02 of the Sixth Supplemental Indenture dated as
of May 1, 2003, supplemental to the Indenture, dated as of March 11, 1998,
between Public Service Company of New Mexico and JPMorgan Chase Bank (formerly
known as The Chase Manhattan Bank), as Trustee, as supplemented, this Note is
nontransferable, except as may be required to effect transfer to any successor
trustee to the Refunding Bond Trustee (as defined herein).

                      PUBLIC SERVICE COMPANY OF NEW MEXICO

              2003 Pollution Control Series C Senior Unsecured Note

No.
                                                                 $__________

                                                         Due: January 1, 2038



         PUBLIC SERVICE COMPANY OF NEW MEXICO, a corporation organized and
existing under the laws of the State of New Mexico (herein called the "Company"


                                       4


which term includes any successor Person under the Indenture hereinafter
referred to), for value received, hereby promises to pay to ___________________,
as trustee under the Indenture of Trust (defined below), on January 1, 2038
(unless this Note shall have been called for previous redemption and provision
made for the payment of the redemption price thereof), the principal sum of
____________________ Dollars ($__________) and to pay interest thereon from the
Initial Interest Accrual Date (defined below) until the principal hereof is paid
or made available for payment, at the rate or rates of interest from time to
time borne by the Refunding Bonds (defined below) for the corresponding Rate
Period (as defined in the Indenture of Trust defined below) payable on each date
or dates as any such interest on the Refunding Bonds shall from time to time be
due and payable in each year (each such date being herein called an "Interest
Payment Date"), commencing on the first Interest Payment Date following the
Initial Interest Accrual Date.

         Payment of the principal of, and premium, if any, and any such interest
on this Note will be made at the office or agency of the Company maintained for
that purpose in The City of New York, in such coin or currency of the United
States of America as at the time of payment is legal tender for payment of
public and private debts.

         This Note is one of a duly authorized issue of senior notes of the
Company (herein called the "Notes"), issued and to be issued in one or more
series under an Indenture, dated as of March 11, 1998 (herein called the
"Indenture", which term shall have the meaning assigned to it in such
instrument), between the Company and JPMorgan Chase Bank (formerly known as The
Chase Manhattan Bank), as Trustee (herein called the "Trustee," which term
includes any successor trustee under the Indenture), and reference is hereby
made to the Indenture for a statement of the respective rights, limitations of
rights, duties and immunities thereunder of the Company, the Trustee and the
Holders of the Notes and of the terms upon which the Notes are, and are to be,
authenticated and delivered, to all of which the Holder, by accepting this Note,
assents. This Note is one of the series designated on the face hereof, limited
in aggregate principal amount to $36,000,000.

         The Indenture permits, with certain exceptions as therein provided, the
Company and the Trustee to enter into one or more supplemental indentures for
the purpose of adding any provisions to, or changing in any manner or
eliminating any of the provisions of, the Indenture with the consent of the
Holders of not less than a majority in aggregate principal amount of the Notes
of all series then Outstanding under the Indenture, considered as one class;
provided, however, that if there shall be Notes of more than one series
Outstanding under the Indenture and if a proposed supplemental indenture shall
directly affect the rights of the Holders of Notes of one or more, but less than
all, of such series, then the consent only of the Holders of a majority in
aggregate principal amount of the Outstanding Notes of all series so directly
affected, considered as one class, shall be required. The Indenture also
contains provisions permitting the Holders of specified percentages in principal
amount of the Notes of each, or all series, as the case may be, then Outstanding
under the Indenture, on behalf of the Holders of all Notes of such series, to
waive compliance by the Company with certain provisions of the Indenture and
permitting the Holders of specified percentages in principal amount of the Notes
of each series Outstanding under the Indenture, on behalf of the Holders of all
Notes of such series, to waive certain past defaults under the Indenture and
their consequences, provided, however, that if any such past default affects
more than one series of Notes, the Holders of a majority in aggregate principal


                                       5


amount of the Outstanding Notes of all such series, considered as one class,
shall have the right to waive such past default, and not the Holders of the
Notes of any one such series. Any such consent or waiver by the Holder of this
Note shall be conclusive and binding upon such Holder and upon all future
Holders of this Note and of any Note issued upon the registration of transfer
hereof or in exchange herefor or in lieu hereof, whether or not notation of such
consent or waiver is made upon this Note.

         As provided in and subject to the provisions of the Indenture, the
Holder of this Note shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Notes of this series, the Holders of not less than a majority in aggregate
principal amount of the Notes of all series at the time Outstanding in respect
of which an Event of Default shall have occurred and be continuing, considered
as one class, shall have made written request to the Trustee to institute
proceedings in respect of such Event of Default as Trustee and offered the
Trustee reasonable indemnity, and the Trustee shall not have received from the
Holders of a majority in principal amount of Notes of all series at the time
Outstanding in respect of which an Event of Default shall have occurred and be
continuing, considered as one class, a direction inconsistent with such request,
and shall have failed to institute any such proceeding, for 60 days after
receipt of such notice, request and offer of indemnity. The foregoing shall not
apply to any suit instituted by the Holder of this Note for the enforcement of
any payment of principal hereof or interest hereon on or after the respective
due dates expressed herein.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
on this Note at the times, place and rate, and in the coin or currency, herein
prescribed.

         The Notes of this series have been issued to Bank of Albuquerque, N.A.,
Albuquerque, New Mexico, as trustee (herein called the "Refunding Bond Trustee")
under the Indenture of Trust and Pledge (the "Indenture of Trust") dated as of
May 1, 2003 between the Maricopa County, Arizona Pollution Control Corporation
(the "Authority") and the Refunding Bond Trustee to secure the Company's
obligations under a Loan Agreement (the "Loan Agreement") dated as of May 1,
2003 between the Authority and the Company to provide for the payment of
principal and Purchase Price (as defined in the Indenture of Trust) of and
premium, if any, and interest due (the "Required Amounts") on the Pollution
Control Revenue Refunding Bonds, 2003 Series A (Public Service Company of New
Mexico Palo Verde Project), issued by the Authority under the Indenture of Trust
(the "Refunding Bonds").

         In the event of failure by the Company to make any payment of any
Required Amount when and as required to be made by it under the Loan Agreement,
this Note shall bear interest from the last date to which interest on such
Refunding Bonds has been paid in full prior to the failure of the Company to pay
such Required Amount (such date being herein called the "Initial Interest
Accrual Date"), at the rate or rates from time to time borne by the Refunding

                                       6


Bonds, payable on the Interest Payment Dates in each year, commencing on the
first Interest Payment Date following the Initial Interest Accrual Date.

         The Trustee may conclusively presume that no payments with respect to
interest on the Notes of this series are due unless and until the Trustee shall
have received a written certificate from the Refunding Bond Trustee or successor
trustee under the Indenture of Trust, signed by an authorized officer of the
Refunding Bond Trustee or such successor trustee, certifying that the Company
has failed to make a payment of any Required Amount when and as required to be
made by it under the Loan Agreement and specifying such Required Amount, the
interest rate or rates borne and to be borne by the Refunding Bonds, the Initial
Interest Accrual Date, the Interest Payment Date(s) and such other matters, if
any, as shall be pertinent to the payment of interest on the Notes of this
series. The Trustee may rely and shall be fully protected in acting upon any
such certificate and shall have no duty with respect to the matters specified in
any such certificate other than to make it available for inspection by the
Company.

         Upon the surrender for cancellation, at any time or from time to time,
of Notes of this series by the Refunding Bond Trustee or any successor trustee
under the Indenture of Trust, or by the Company to the Trustee, the Notes so
surrendered shall be deemed fully paid and the obligations of the Company
thereunder shall be terminated, and such Notes shall be canceled by the Trustee
and delivered to the Company.

         This Note is nontransferable except to effect transfer to any successor
trustee to the Refunding Bond Trustee, any such transfer to be made as provided
in the Indenture and subject to certain limitations therein set forth, by the
registration of transfer of this Note in the Note Register, upon surrender of
this Note for registration of transfer at the office or agency of the Company in
any place where the principal of and any premium and interest on this Note are
payable, duly endorsed by, or accompanied by a written instrument of transfer in
form satisfactory to the Company and the Note Registrar, duly executed by the
Holder hereof or his attorney duly authorized in writing, and thereupon one or
more new Notes of this series and of like tenor, of authorized denominations and
for the same aggregate principal amount, will be issued to the successor
Refunding Bond Trustee.

         If an Event of Default with respect to Notes of this series shall occur
and be continuing, the principal of the Notes of this series may be declared due
and payable in the manner and with the effect provided in the Indenture.

         No recourse shall be had for the payment of the principal of or
premium, if any, or interest, if any, on any Notes, or any part thereof, or for
any claim based thereon or otherwise in respect thereof, or of the indebtedness
represented thereby, or upon any obligation, covenant or agreement under the
Indenture, against any incorporator, stockholder, employee, officer or director,
as such, past, present or future of the Company or of any predecessor or
successor corporation (either directly or through the Company or a predecessor
or successor corporation), whether by virtue of any constitutional provision,
statute or rule of law, or by the enforcement of any assessment or penalty or
otherwise; it being expressly agreed and understood that the Indenture and all
Notes are solely corporate obligations, and that no personal liability
whatsoever shall attach to, or be incurred by, any incorporator, stockholder,

                                       7


employee, officer or director, past, present or future, of the Company or of any
predecessor or successor corporation, because of the indebtedness hereby
authorized or under or by reason of any of the obligations, covenants or
agreements contained in the Indenture or in any of the Notes or to be implied
herefrom or therefrom, and that any such personal liability is hereby expressly
waived and released as a condition of, and as part of the consideration for, the
execution of the Indenture and the issuance of the Notes.

         The Notes of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
Notes of this series are exchangeable for a like aggregate principal amount of
Notes of this series and of like tenor of a different authorized denomination,
as requested by the Holder surrendering the same.

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.

         Prior to due presentment of this Note for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Note is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         The Notes of this series shall be redeemable as provided in the Sixth
Supplemental Indenture, dated as of May 1, 2003, supplemental to the Indenture.

         All terms used in this Note which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

         Unless the certificate of authentication hereon has been executed by
the Trustee referred to below by manual signature, this Note shall not be
entitled to any benefit under the Indenture or be valid or obligatory for any
purpose.

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

                                        PUBLIC SERVICE COMPANY OF NEW MEXICO


                                        By:
                                            -----------------------------------
                                                 [Title]

Attest:

- --------------------------------
[Assistant] Secretary


                                       8



                         CERTIFICATION OF AUTHENTICATION
                         -------------------------------

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

Dated:
                                         JPMORGAN CHASE BANK,
                                         as Trustee

                                         By:
                                              ---------------------------------
                                                    Authorized Officer


                                  ARTICLE THREE

                          ORIGINAL ISSUE OF 2003C NOTES
                          -----------------------------

         SECTION 3.01. 2003C Notes in the aggregate principal amount of
$36,000,000 may, upon execution of this Sixth Supplemental Indenture, or from
time to time thereafter, be executed on behalf of the Company by any officer or
employee authorized to do so by a Board Resolution under its corporate seal
affixed thereto or reproduced thereon attested by its Secretary or by one of its
Assistant Secretaries and delivered to the Trustee for authentication, and the
Trustee shall thereupon authenticate and deliver said 2003C Notes in accordance
with a Company Order delivered to the Trustee by the Company, all pursuant to
and in accordance with Section 3.03 of the Indenture, as heretofore amended.

                                  ARTICLE FOUR

                           PAYING AGENT AND REGISTRAR
                           --------------------------

         SECTION 4.01. JPMorgan Chase Bank will be the Paying Agent and Note
Registrar for the 2003C Notes.

                                  ARTICLE FIVE

                                SUNDRY PROVISIONS
                                -----------------

         SECTION 5.01. The Company hereby covenants that so long as any of the
2003C Notes shall remain outstanding, the Company shall deliver to the Trustee
as soon as available copies (certified by an officer or employee of the Company
to be true) of the Indenture of Trust, the Loan Agreement and copies of any
supplements, amendments or replacements thereto, together with such other

                                       9


documents and instruments as the Trustee may reasonably request from time to
time in connection with the transactions contemplated hereby. The Trustee shall
have no duty to examine or take any other action with respect to any such
documents or instruments so received by it other than to retain in its files any
of same which it so receives and to make same available for inspection during
normal business hours by any owner of the 2003C Notes.

         SECTION 5.02. Except as otherwise expressly provided in this Sixth
Supplemental Indenture or in the form of the 2003C Notes or otherwise clearly
required by the context hereof or thereof, all terms used herein or in said form
of the 2003C Notes that are defined in the Indenture shall have the several
meanings respectively assigned to them thereby.

         SECTION 5.03. The Indenture, as heretofore supplemented and as
supplemented by this Sixth Supplemental Indenture, is in all respects ratified
and confirmed, and this Sixth Supplemental Indenture shall be deemed part of the
Indenture in the manner and to the extent herein and therein provided.

         SECTION 5.04. The Trustee hereby accepts the trusts herein declared,
provided, created, supplemented, or amended and agrees to perform the same upon
the terms and conditions herein and in the Indenture set forth and upon the
following terms and conditions:

         The Trustee shall not be responsible in any manner whatsoever for or in
         respect of the validity or sufficiency of this Sixth Supplemental
         Indenture or for or in respect of the recitals contained herein, all of
         which recitals are made by the Company solely. In general, each and
         every term and condition contained in Article VI of the Indenture shall
         apply to and form part of this Sixth Supplemental Indenture with the
         same force and effect as if the same were herein set forth in full with
         such omissions, variations, and insertions, if any, as may be
         appropriate to make the same conform to the provisions of this Sixth
         Supplemental Indenture.

         To the extent permitted by Section 6.01 of the Indenture, and without
         limitation of Section 6.03 of the Indenture, the Trustee may rely and
         shall be protected in acting upon any resolution, certificate,
         statement, instrument, opinion, report, notice, request, direction,
         consent, order, bond, debenture, note, other evidence of indebtedness,
         or other paper or document (including, without limitation, the
         Indenture of Trust, the Loan Agreement, and any notice, certificate, or
         other document provided for in the Indenture of Trust or the Loan
         Agreement) believed by the Trustee to be genuine and to have been
         signed or presented by the proper party or parties.

         SECTION 5.05. This Sixth Supplemental Indenture may be executed in any
number of counterparts, each of which so executed shall be deemed to be an
original, but all such counterparts shall together constitute but one and the
same instrument.


                                       10



         IN WITNESS WHEREOF, the parties hereto have caused this Sixth
Supplemental Indenture to be duly executed, and their respective corporate seals
to be hereunto affixed and attested, all as of the day and year first above
written.


                                        PUBLIC SERVICE COMPANY OF NEW MEXICO


                                        By:   /s/ T. R. Horn
                                            -----------------------------------
                                              T. R. Horn
                                              Vice President and Treasurer

Attest:

         /s/ S. Jim Acosta
- -----------------------------------
         Assistant Secretary






                                        JPMORGAN CHASE BANK,
                                        as Trustee


                                        By:   /s/
                                            -----------------------------------
                                              Natalia Rodriguez
                                              Vice President

Attest:

         /s/ Nicholas Sberlati
- -----------------------------------
         Trust Officer



                                       11





STATE OF NEW MEXICO    )
                       ) ss:
COUNTY OF BERNALILLO   )

         On the __ day of May, 2003 before me personally came T. R. Horn, to me
known, who, being by me duly sworn, did depose and say that he is Vice President
and Treasurer of Public Service Company of New Mexico, one of the corporations
described in and which executed the foregoing instrument; that he knows the seal
of said corporation; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by authority of the Board of Directors of said
corporation; and that he signed his name thereto by like authority.

                                        /s/ Lisa Abeyta
                                        ---------------------------------------
                                        Notary Public

                                        My Commission Expires:  4-18-2005
                                                              -----------------





STATE OF NEW YORK          )
                           ) ss:
COUNTY OF NEW YORK         )

         On the __ day of May, 2003 before me personally came Natalia Rodriguez,
to me known, who, being by me duly sworn, did depose and say that she is a Vice
President of JPMorgan Chase Bank, one of the corporations described in and which
executed the foregoing instrument; that she knows the seal of said corporation;
that the seal affixed to said instrument is such corporate seal; that it was so
affixed by authority of the Board of Directors of said corporation; and that she
signed her name thereto by like authority.

                                        /s/ Emily Fayan
                                        ---------------------------------------
                                        Notary Public



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