Exhibit No. 10.83

[*] indicates that the confidential portion has been omitted from this filed
exhibit and filed separately with the Securities and Exchange Commission.




                            Transportation Agreement
                            ------------------------
                                Buy Out Agreement
                                -----------------

                                      Among

                         San Juan Transportation Company

                      Public Service Company of New Mexico

                          Tucson Electric Power Company



                                Table of Contents
                                -----------------



Section 0 - Parties and Recitals.............................................1

Section 1 - Definitions and Term.............................................1

   1.1      EFFECTIVE DATE...................................................1

   1.2      OUTSTANDING SJTA OBLIGATIONS.....................................1

   1.3      SJTC COSTS.......................................................1

   1.4      TERM.............................................................2


Section 2 - Conditions Precedent, Representations and Warranties.............2

   2.1      CONDITIONS PRECEDENT.............................................2

   2.2      REPRESENTATIONS AND WARRANTIES...................................2


Section 3 - SJTC Compensation................................................2

   3.1      SJTA BUY OUT VALUE...............................................2

   3.2      INFLATION - DEFLATION ADJUSTMENT.................................3

   3.3      PAYMENT OF TBOV..................................................3

   3.4      PAYMENT OF SJTC COSTS............................................4


Section 4 - SJTA Termination.................................................5

   4.1      SJTA TERMINATION.................................................5


Section 5 - SJTC Obligations.................................................5

   5.1      SJTC OBLIGATIONS.................................................5


Section 6 - Dispute Resolution...............................................6

   6.1      MATTERS TO BE ARBITRATED; NOTICE OF CLAIMS AND DEFENSES;
            PARTY ARBITRATOR DESIGNATION.....................................6

   6.2      ARBITRATORS; SELECTION OF NEUTRAL ARBITRATOR.....................6

   6.3      ARBITRATION HEARINGS, PROCEDURES AND TIMING......................6

   6.4      CHOICE OF LAW....................................................6

   6.5      AWARD AND ENFORCEMENT............................................7

   6.6      PERFORMANCE PENDING ARBITRATION DECISION.........................7

   6.7      DEFINITION OF "PARTIES" FOR THIS SECTION.........................7


                                     Page i



Section 7 - Joint Committee..................................................7

   7.1      PURPOSE..........................................................7

   7.2      DESIGNATION......................................................7

   7.3      AUTHORITY........................................................7

   7.4      DECISIONS........................................................8

   7.5      RELATIONSHIP TO ARBITRATION......................................8


Section 8 - General Provisions...............................................8

   8.1      CONFIDENTIALITY..................................................8

   8.2      JOINT AND SEVERAL................................................8

   8.3      ENTIRE AGREEMENT.................................................8

   8.4      SUCCESSORS AND ASSIGNS...........................................9

   8.5      CONSTRUCTION.....................................................9

   8.6      WAIVER OF CONSEQUENTIAL DAMAGES..................................9

   8.7      NOTICES..........................................................9


Section 9 - Signatures......................................................11



Attachment 1     Guarantee


                                     Page ii



                        Section 0 - Parties and Recitals
                        --------------------------------

This Transportation Agreement Buy Out Agreement ("Agreement") is dated August
31, 2001, to become effective on December 31, 2002, as provided herein, by and
between San Juan Transportation Company, a Delaware corporation ("SJTC"), Public
Service Company of New Mexico, a New Mexico corporation ("PNM"), and Tucson
Electric Power Company, an Arizona corporation ("TEP") (PNM and TEP are referred
to collectively as "Utilities"), (with SJTC and Utilities herein sometimes
collectively referred to as "Parties").

Whereas, SJTC and Utilities are parties to the Transportation Agreement dated
April 30, 1984 between SJTC and Utilities, as amended ("SJTA"), which has a term
through 2017;

Whereas, Utilities have ongoing obligations under the SJTA;

Whereas, SJTC and the Utilities desire to terminate the SJTA and provide
compensation to SJTC for the Utilities' remaining obligations under the SJTA;

Whereas, SJTC, San Juan Coal Company ("SJCC"), and Utilities are parties to the
Underground Letter Agreement dated August 31, 2000 ("UG Letter Agreement"); and,

Whereas, SJCC and Utilities are parties to the Underground Coal Sales Agreement
("UG-CSA") dated August 31, 2001.

NOW, THEREFORE, in consideration of the terms, covenants and agreements
contained in this Agreement, Utilities jointly and severally agree with SJTC as
follows:

                        Section 1 - Definitions and Term
                        --------------------------------

1.1      Effective Date

         Subject to Section 2.1 "Conditions Precedent", the Effective Date of
         this Agreement shall be December 31, 2002.

1.2      Outstanding SJTA Obligations

         "Outstanding SJTA Obligations" shall be defined as any payments,
         costs, audit adjustments (including 3rd party audits), or other
         obligations arising from or related to performance under the SJTA
         prior to the SJTA termination.

1.3      SJTC Costs

         "SJTC Costs" shall be defined as:

         A)    Any and all rentals, royalties, overriding royalties, other
               retained interests, charges, fees and all other payments paid or
               incurred by SJTC in connection with this Agreement;

         B)    Any Outstanding SJTA Obligations; and,

         C)    Any and all actual costs incurred by SJTC (including reasonable
               attorney fees and expenses) relating to all claims other than
               those between Utilities and SJTC which arise from the payment of
               TBOV as defined in Section 3.1 "SJTA Buy Out Value".


                                       1



1.4      Term

         This Agreement shall terminate after all payments have been received
         in full by SJTC in accordance with the terms of this Agreement and
         all obligations under this Agreement have been satisfied or otherwise
         resolved pursuant to Section 6 "Dispute Resolution".

         Section 2 - Conditions Precedent, Representations and Warranties
         ----------------------------------------------------------------

2.1      Conditions Precedent

         The Conditions Precedent to this Agreement becoming effective are:

         A)    Satisfaction of the conditions precedent contained in the UG-CSA.

         B)    Final approval of this Agreement by the San Juan Fuels Committee
               pursuant to the requirements of the San Juan Project
               Participation Agreement dated as of October 27, 1999, to be
               obtained no later than September 28, 2001, and written
               notification of such approval to SJTC by the Utilities.

         C)    Execution of the Guarantee by the Guarantor in the form attached
               to this Agreement as Attachment 1 and incorporated herein, to be
               obtained no later than September 28, 2001, and provided to
               Utilities by SJTC.

2.2     Representations and Warranties

        As of the execution of this Agreement and subject to satisfaction of
        the applicable conditions precedent described in this Agreement, each
        party warrants and represents that:

         A)    It is a corporation duly organized and in good standing in its
               state of incorporation and is qualified to do business and is in
               good standing in those states where necessary in order to carry
               out the purposes of this Agreement;

         B)    It has the capacity to enter into and perform this Agreement and
               all transactions contemplated in this Agreement, and that all
               corporate actions required to authorize it to enter into and
               perform this Agreement have been taken properly; and

         C)    This Agreement has been duly executed and delivered by it and is
               valid and binding upon it in accordance with its terms.

                         Section 3 - SJTC Compensation
                         -----------------------------

3.1      SJTA Buy Out Value

         The Utilities shall pay to SJTC [*] adjusted per Section 3.2
         "Inflation - Deflation Adjustment" ("TBOV"), on December 31, 2002, to
         buy out the value of the SJTA Capital Investment Element and to
         extinguish any further obligations under the SJTA.


                                       2



3.2      Inflation - Deflation Adjustment

         A)    The amount of [*] will be adjusted for inflation according to the
               following formula:

                           TBOV = [*] x D1 / D0

                (1 & 0 are subscripts)
                D1 and D0 are defined herein.

                In no event shall the inflation-deflation adjustment cause TBOV
                to be less than [*].

         B)    The "Inflation Index", calculated to three decimal places, shall
               be equal to the sum of sixty-five percent (65%) times the
               "Producer Price Index- Commodities for Construction Machinery and
               Equipment (Series Id WPU112)" not seasonally adjusted, as
               published by the United States Department of Labor, Bureau of
               Labor Statistics ("Index"), plus thirty-five percent (35%) times
               the "Implicit Price Deflator, Gross Domestic Product", as
               published by the United States Department of Commerce, Bureau of
               Economic Analysis ("Deflator").

               i     D0 shall be the Inflation Index calculated using the most
                     recently published values for June 2000, for the Index and
                     Deflator described above.

               ii    D1 shall be the Inflation Index calculated using the most
                     recently published values available for the date when the
                     payment is due, for the Index and Deflator described above.

               In the event that there is a revision of a base index figure, the
               base index figure will be revised in accordance with pertinent
               published instructions regarding such revision, or if such
               instructions are not published, the base index figure will be
               revised in a manner, which fairly reflects the revision.

               In the event that publication of any of the indices specified for
               use under this Section 3.2 (B) should be discontinued or in the
               event the items or categories upon which such published index is
               based should be so modified or changed as to make the further use
               of such index inequitable, the Parties agree to develop a
               mutually acceptable substitute index (either published or
               compiled or arranged by the Parties).

3.3      Payment of TBOV

         A)    There will not be an invoice generated by SJTC for payment made
               pursuant to Section 3.1.

         B)    Utilities agree to make an electronic funds transfer of TBOV due
               to SJTC, and all applicable taxes, to SJTC's nominated account
               (to be nominated in writing by SJTC at least 60 days before the
               payment date) on or before the payment date described herein.
               Applicable taxes shall include any and all taxes (including
               without limitation gross income, gross receipts, value added,
               sales, use, occupation, franchise, personal property, stamp and
               other taxes), levies, imposts, duties, charges or withholdings of
               any nature whatsoever, together with any interest thereon (any of
               the foregoing fees, taxes and interest being for purposes hereof
               called "taxes") imposed by any sovereign political or


                                       3


               governmental authority or taxing authority upon or in connection
               with SJTC's operation and with any activities and transactions
               under this Agreement (including reimbursements for SJTC Costs as
               described hereunder) excepting only taxes which are measured by
               net income (other than any such taxes measured by net income
               which are imposed in lieu of taxes measured by gross income and
               gross receipts).

         C)    Utilities shall provide SJTC with documentation of the Inflation
               Index used to determine the payment amount with notification of
               the electronic funds transfer.

3.4      Payment of SJTC Costs

         A)    Invoicing and Payment

               SJTC will invoice the Utilities for SJTC Costs. Invoices
               submitted by SJTC shall be due and payable by Utilities on the
               twenty-second (22nd) day of the month succeeding the month for
               which such invoice is submitted, or on the twelfth (12th) day
               after receipt of the invoice by Utilities, whichever date is
               later. Payment shall be made to SJTC by electronic funds transfer
               to such bank account as SJTC may from time to time designate.

         B)    Disputed Invoices

               In case any portion of any invoice concerning SJTC Costs is
               disputed, the undisputed amount shall be paid when due; provided
               however, that Utilities may also pay the disputed portion of such
               invoice without thereby waiving their right to contest such
               disputed portion. Disputed invoices for SJTC Costs shall be
               referred initially to the Joint Committee for resolution.

         C)    Failure to Pay

               In the event Utilities fail to pay any amount due and not in bona
               fide dispute, SJTC shall be paid interest on all amounts owing
               under any invoice submitted hereunder which are not paid when due
               and payable, with said interest to be calculated at the Prime
               Rate as published in the Wall Street Journal for corporate loans
               posted by at least 75% of the nation's largest banks (or its
               equivalent) plus three percent (3%) but not in excess of the
               maximum rate of interest permitted by law and to be paid for the
               actual number of days elapsed since the invoice was due and
               payable. This right shall not be deemed an exclusive right or
               remedy.

         D)    Audits

               SJTC will keep books, records and accounts necessary to show all
               information required for purposes of this Section 3.4. Upon
               Utilities' request, SJTC shall supply Utilities, by report and/or
               with actual source documents, the information reasonably


                                       4


               necessary to verify any invoice for SJTC Costs issued pursuant to
               this Agreement; provided, however, that SJTC shall not be
               required to disclose information which in the opinion of SJTC is
               of a confidential nature due to the relationship of such
               information to SJTC's existing or contemplated operations. In the
               event Utilities and SJTC are unable to agree that the invoice is
               calculated correctly, a verification of such invoice shall be
               prepared and certified by a nationally recognized firm of
               certified public accountants, to be selected by Utilities from a
               list of three (3) such firms submitted by SJTC, such verification
               to set forth all data reasonably necessary to verify that the
               invoice is calculated correctly. The findings of said
               verification shall be accepted by both Utilities and SJTC as
               final and binding with respect to that invoice. The accounting
               firm selected for any such verification shall be bound not to
               disclose and shall treat as confidential any and all proprietary
               information of SJTC furnished to or examined by such firm in
               connection with such audit. It is understood that such
               verification shall not provide Utilities with nor entitle
               Utilities access to SJTC's books or records.

               If any such verification discloses that a calculation error has
               occurred and that, as a result thereof, an amount is due to one
               or the other party, such amount shall promptly be paid to whom it
               is owed; provided, however, if there is a dispute relating to the
               validity of a charge or adequacy of a payment either party may
               submit such dispute to the Joint Committee. All expenses of any
               such requested verification shall be paid by Utilities. Invoices
               which are not contested by either party within twenty-four (24)
               months from the date of the Invoice shall be deemed to be correct
               and will not thereafter be subject to verification.

                          Section 4 - SJTA Termination
                          ----------------------------

4.1      SJTA Termination

               Upon receipt of the TBOV payment by SJTC as adjusted and in
               consideration of the terms and conditions set forth in this
               Agreement, the SJTA and the associated Guarantee by BHP Minerals
               International Inc. are terminated and all obligations under the
               SJTA are satisfied.

                          Section 5 - SJTC Obligations
                          ----------------------------

5.1      SJTC Obligations

               SJTC shall use reasonable efforts consistent with law to minimize
               claims for costs referenced in Section 1.3(A) and to manage costs
               referenced in Section 1.3(C).


                                       5


                         Section 6 - Dispute Resolution
                         ------------------------------

6.1      Matters To Be Arbitrated; Notice of Claims and Defenses; Party
         Arbitrator Designation

               Either party may demand final and binding arbitration of any
               dispute, claim or controversy arising out of or relating to this
               Agreement, performance or actions pursuant to this Agreement, or
               concerning the interpretation of this Agreement (whether such
               matters sound in contract, tort or otherwise and including
               without limitation repudiation, illegality, and/or fraud in the
               inducement) by giving written notice to the other party of all
               claims it desires to submit to arbitration; provided, however,
               that matters within the authority of the Joint Committee must be
               presented first to that committee for consideration. Disputes
               regarding the payment of TBOV shall be immediately subject to
               arbitration in accordance with this section. The notice shall
               include: (a) the demanding party's designation of a party
               arbitrator; and (b) a detailed statement of the facts and
               theories supporting the claims. The party on whom the arbitration
               demand is served shall have thirty days from receipt of the
               notice to respond in writing to the demand and to submit any
               additional claims it wishes to submit to arbitration at the same
               time. The response also shall include: (a) the designation of the
               party arbitrator for that party; and (b) a detailed statement of
               the facts and theories supporting the claims and/or defenses
               asserted. The party originally demanding arbitration shall reply
               in writing to any additional claims submitted within ten days
               from the receipt of response.

6.2      Arbitrators; Selection of Neutral Arbitrator

               Any party who fails to designate timely its party arbitrator
               shall forfeit its right to designate an arbitrator. If only one
               arbitrator is timely designated, that single arbitrator shall
               hear the dispute. If two arbitrators are timely designated, those
               arbitrators shall, within thirty days, either agree on the
               appointment of a third, disinterested arbitrator knowledgeable as
               to the subject matter involved in the arbitration or petition the
               Chief Judge of the United States District Court for the District
               of New Mexico for the appointment of a third arbitrator. The
               parties shall be equally liable for the reasonable fees and
               expenses of the neutral arbitrator hearing the dispute. The
               parties shall be responsible for the fees and expenses of their
               respective party-appointed arbitrator.

6.3      Arbitration Hearings, Procedures and Timing

               All reasonable efforts will be made to hold a hearing on the
               claims submitted within sixty days after the appointment of the
               last arbitrator. In conducting the hearing, the arbitrators are
               directed, where feasible and where not inconsistent with the
               provisions of this paragraph, to adhere to the then-existing
               American Arbitration Association procedures and rules relating to
               commercial disputes. Unless otherwise agreed by the parties, the
               hearing shall be held in Farmington, New Mexico.


                                       6


6.4      Choice of Law

               The arbitrators shall apply the laws of the State of New Mexico.

6.5      Award and Enforcement

               The decision or award of the arbitrators shall be given in
               writing within thirty days after the conclusion of the hearing.
               The arbitrators are authorized to award money damages, injunctive
               and declaratory relief and/or specific performance, if such
               relief in their opinion is appropriate. In any arbitration, each
               party shall bear its own costs, expenses, and attorneys' fees.
               The arbitrators do not have authority to award costs, expenses,
               or attorneys' fees to the prevailing party. The award or decision
               of the arbitrators shall be subject to review or enforcement in
               accordance with the New Mexico Uniform Arbitration Act, NMSA 1978
               ss.ss. 44-7-1 et seq. Any party shall be entitled to recover
               reasonable attorneys' fees and costs incurred in enforcing any
               arbitration award or decision made pursuant to the arbitration
               provisions of this Agreement.

6.6      Performance Pending Arbitration Decision

               During the arbitration, unless otherwise ordered by the
               arbitrators, the parties agree to continued performance under
               this Agreement.

6.7      Definition of "Parties" for this Section

               For purposes of this Section 6, the Utilities shall be considered
               a single party. Specifically, and by example, the Utilities must
               act collectively to select their party arbitrator under Section
               6.2 "Arbitrators; Selection of Neutral Arbitrator".

                          Section 7 - Joint Committee
                          ---------------------------

7.1      Purpose

               The intent of the Parties in providing for a Joint Committee is
               to establish an orderly and continuing means of dealing with
               matters that may arise from time to time in carrying out the
               provisions of this Agreement. The Joint Committee shall have four
               (4) members.

7.2      Designation

               During the term of this Agreement, SJTC will, by notice to
               Utilities, designate two (2) individuals as its representatives
               on the Joint Committee, and Utilities will, by notice to SJTC,
               designate two (2) individuals as their representatives on the
               Joint Committee; and each such representative shall be authorized
               by the party(ies) by whom he is designated to act on its (their)
               behalf with respect to matters herein specified to be
               responsibilities of the Joint Committee. A representative may not
               delegate his responsibilities to others, but Utilities, or SJTC,
               may designate an alternate to act when said representative is
               unavailable. Either Utilities, or SJTC, by notice to the other,
               may change the designation of its (their) representatives.

7.3      Authority

               The Joint Committee shall have authority and responsibility to
               address disputes arising from or related to this Agreement other
               than disputes regarding the payment of TBOV. The Joint Committee
               shall not have any authority with respect to disputes regarding
               the payment of TBOV and such disputes shall be immediately
               subject to arbitration.


                                       7


7.4      Decisions

               Decisions by the Joint Committee shall require the unanimous
               approval of all representatives of the Joint Committee and shall
               be evidenced by the signatures of all said representatives.

7.5      Relationship to Arbitration

               In case agreement should not be reached among the representatives
               of the Joint Committee as to any of the matters referred to in
               Section 7.3 "Authority" as responsibilities of the Joint
               Committee, such matters shall be forthwith submitted to and
               determined by arbitration as provided for in Section 6 "Dispute
               Resolution".

                         Section 8 - General Provisions
                         ------------------------------

8.1      Confidentiality

               The terms and conditions, including those dealing with
               compensation, set forth in this Agreement are considered by
               Utilities and SJTC to be confidential and proprietary information
               and none of the parties shall disclose any such information to
               any third party other than the attorneys, auditors and agents of
               Utilities, other owners of the San Juan Station, and SJTC,
               without the advance written consent of the other parties;
               provided however, disclosure may be made without advance consent
               where, in the opinion of counsel, such disclosure may be required
               by order of court or regulatory agency, law or regulation or in
               connection with judicial or administrative proceedings involving
               a party hereto, in which event the party to make such disclosure
               shall advise the other parties in advance as soon as possible and
               cooperate to the maximum extent practicable to minimize the
               disclosure of any such information, including, where practicable,
               deletion of portions of this Agreement relating to compensation,
               including, Section 3 "SJTC Compensation".

               Utilities shall maintain with the owners of the San Juan Station
               other than the Utilities written confidentiality agreements that
               are acceptable to SJTC prior to the disclosure of the terms of
               this Agreement.

8.2      Joint and Several

               The Utilities' duties and obligations under this Agreement shall
               be joint and several.

8.3      Entire Agreement

               This Agreement supersedes all prior agreements and
               representations between the Parties, whether written or oral,
               with respect to the subject matter of this Agreement and is
               intended as a complete and exclusive statement of the terms of
               the agreement between the Parties with respect to the subject
               matter. Except as specifically set forth in this Agreement, no
               representations have been made to induce any of the Parties to
               enter into this Agreement.

                                       8


8.4      Successors and Assigns

               This Agreement and all of the rights and obligations of the
               Parties described shall extend to and be binding upon, and shall
               inure to the benefit of, the respective successors and assigns of
               the respective Parties.

8.5      Construction

               The terms and conditions of this Agreement are the result of
               negotiation and drafting on an equal footing by the Parties and
               their legal counsel. This Agreement shall be construed
               evenhandedly and without favor or predisposition to any party.

8.6      Waiver of Consequential Damages.

               SJTC and the Utilities waive any recovery of consequential
               damages related to the breach of this Agreement.

8.7      Notices

         A)    Any notice, demand or request provided for in this Agreement, or
               given or made in connection with this Agreement shall be in
               writing, signed by an officer of the party giving such notice and
               shall be deemed to be properly and sufficiently given or made if
               sent by registered or certified mail, and if to SJTC, addressed
               as follows:

                           San Juan Transportation Company
                           300 West Arrington, Suite 200
                           Farmington, NM 87401
                           Attention: President

              with a copy addressed as follows:

                           San Juan Transportation Company
                           Post Office Box 155
                           Fruitland, NM 87416
                           Attention:  Vice President

              and if to Utilities, addressed as follows:

                           Public Service Company of New Mexico
                           Alvarado Square
                           Albuquerque, NM 87158
                           Attention:  Corporate Secretary

              and

                           Tucson Electric Power Company
                           Post Office Box 711
                           Tucson, AZ 85702
                           Attention:  Secretary


                                       9


         B)    Any party hereto may change its address for notice by so advising
               the other Parties hereto in accordance with the provisions of
               this Section 8.7. Any notice given in accordance with the
               provisions of this Section 8.7 shall be deemed effectively given
               as of the date of its deposit with the United States Postal
               Service.


                                       10


                             Section 9 - Signatures

IN WITNESS WHEREOF, SJTC and the Utilities, by their duly authorized
representatives, have entered into this Agreement.



         PUBLIC SERVICE COMPANY OF NEW MEXICO





         By: /s/ Patrick J. Goodman                                    8/29/01
             ----------------------------------------                  -------

              Patrick J. Goodman, Vice President                       Date







         TUCSON ELECTRIC POWER COMPANY





         By: /s/ Kevin Larson                                          8/31/01
             -------------------------------------------------         -------

              Kevin Larson, Vice President                             Date







         SAN JUAN TRANSPORTATION COMPANY





         By: /s/ John W. Grubb                                         8/29/01
             ----------------------------------------                  -------

              John W. Grubb, President                                 Date



                                       11