Southwestern Public Service Company

BYLAWS

(As Amended Through May 1, 1997)

ARTICLE I

Shareholders


     SECTION 1. ANNUAL  MEETING.  The annual meeting of the  shareholders of the
Company  for the  election of  directors  and for the  transaction  of any other
business  that may be properly  brought  before the meeting shall be held at the
place, date, and hour as designated by resolution of the Board of Directors.

     SECTION 2. SPECIAL  MEETINGS.  Special meetings of the shareholders for any
purpose or purposes  shall be called by the Secretary  upon receipt of a written
request  from either the Chairman of the Board or the  President,  a majority of
the directors,  or any person or persons  authorized by the New Mexico  Business
Corporation Act (the "NMBCA") to request such a meeting. Special meetings of the
shareholders  shall be held at the place, date, and hour as designated by either
the  Chairman of the Board or the  President  or by  resolution  of the Board of
Directors.

     SECTION 3. PROCEDURE. At each meeting of the shareholders,  the Chairman of
the Board or, in his or her absence,  the President shall act as chairman of the
meeting.  The chairman of the meeting shall  determine the order of business and
all other matters of procedure.  The chairman of the meeting may establish rules
to maintain order and to conduct the meeting.  The chairman of the meeting shall
act in his or her absolute discretion, and his or her rulings are not subject to
appeal.

ARTICLE II

Directors

     SECTION 1. BOARD OF DIRECTORS. The business of the Company shall be managed
by a Board of  Directors.  The  number of  directors  constituting  the Board of
Directors  shall be established  from time to time by resolution of the Board of
Directors,  within  the  limitations  set  forth  in the  Restated  Articles  of
Incorporation.

     No person who has  attained  the age of  sixty-five  shall be eligible  for
election as a director  of the  Company  unless he or she is already a member of
the Board of  Directors.  No director  who has  attained  the age of seventy (or
seventy-two in the case of any director who was over sixty-five as of January 1,
1991) shall serve as a director  effective  with the next annual  meeting of the
shareholders.  No director who was also an officer of the Company at the time he
or she was last elected as a director  shall serve as a director  effective with
the next annual meeting of the shareholders after ceasing to be an officer.

     SECTION 2. REGULAR MEETINGS. Regular meetings of the Board of Directors may
be held without notice at times and places determined by the Board of Directors.

     SECTION 3.  SPECIAL  MEETINGS.  Special  meetings of the Board of Directors
shall be called by the Secretary upon the receipt of a request from the Chairman
of the Board, the President, or any three directors.  Notice of special meetings
shall be given to each  director at any time before the special  meeting  either
personally  or by  telephone  (including  by  message  or  recording  device) or
telegraph or facsimile not less than two hours before the meeting or by mail not
less than three days  before the  meeting.  Any notice  shall be directed to the
address or telephone  number of each  director as furnished to the Secretary for
that purpose.

     SECTION 4. ADJOURNMENT OF MEETINGS.  The directors may adjourn from time to
time any regular or special meeting at which a quorum is present, without notice
other than  announcement at the meeting.  The adjourned meeting may be called to
order at any time without  further  notice,  and any business may be  transacted
which might have been transacted at the original meeting.

     SECTION  5.  COMPENSATION  OF  DIRECTORS.  The  Board of  Directors  may by
resolution  provide for payment of fees for  attendance at meetings of the Board
of  Directors  and the  reimbursement  of expenses  of  directors  in  attending
meetings.  The Board of Directors may also by resolution provide for the payment
of other fees or compensation to members of the Board of Directors.

     SECTION 6.  AUTHORITY TO APPOINT  COMMITTEES  AND DELEGATE  AUTHORITY.  The
Board of  Directors,  by  resolution  adopted by a majority of the full Board of
Directors, may designate from among its members one or more committees,  each of
which,   except  to  the  extent  limited  by  law,  the  Restated  Articles  of
Incorporation,  these Bylaws,  and the  resolution  establishing  the committee,
shall have and may exercise all the authority of the Board of Directors, and may
also  prescribe  rules of operation of the  committee.  Regular  meetings of any
committee may be held without notice at times and places determined by the Board
of Directors or the committee. Special meetings of any committee shall be called
by the  Secretary  upon the receipt of a request from the Chairman of the Board,
the  President,  the  chairman  of the  committee,  or any  two  members  of the
committee.  Notice  of  special  meetings  shall be given in the same  manner as
provided in Section 3 of this Article II.

ARTICLE III

Officers

     SECTION 1. NUMBER.  The officers of the Company  shall be a Chairman of the
Board,  a  President,  one or more Vice  Presidents  (one or more of whom may be
designated Executive Vice President or Senior Vice President),  a Secretary, and
a Treasurer,  and may include a Controller.  A chief executive  officer, a chief
operating officer, a chief financial officer, and a chief accounting officer may
be designated by the Board of Directors from among the officers.

     SECTION 2.  ELECTION AND TERM OF OFFICE.  Each officer  shall be elected by
the Board of  Directors  and shall hold office until the meeting of the Board of
Directors following the next annual meeting of the shareholders and until his or
her  successor  has been  elected  and  qualified  or until  his or her  earlier
retirement,  resignation,  or removal. The Chairman of the Board shall be chosen
from among the directors.

     SECTION 3.  REMOVAL AND  VACANCIES.  Any officer may be removed at any time
with or without cause by the Board of Directors.  A vacancy in any office may be
filled for the unexpired  portion of the term in the same manner as provided for
election to the office.

     SECTION 4. ASSISTANT  OFFICERS.  The Company may have assistant officers as
the Board of Directors may elect.  Each  assistant  officer shall hold office at
the  pleasure  of, and may be removed at any time with or without  cause by, the
Board of Directors.  Assistant  officers may include one or more  Assistant Vice
Presidents,   Assistant   Secretaries,   Assistant  Treasurers,   and  Assistant
Controllers.

     SECTION 5. DUTIES.  Each officer shall have the authority and shall perform
the duties as may be assigned  by the Board of  Directors,  the  Chairman of the
Board,  or the  President,  or as shall be conferred or required by law or these
Bylaws, or as shall be incidental to the office.

ARTICLE IV

Indemnification of Directors, Officers, Employees, and Agents

     Each person who is a party or is threatened  to be made a party,  either as
plaintiff,  defendant,  respondent,  or  otherwise,  to  any  action,  suit,  or
proceeding,  whether  civil,  criminal,   administrative,  or  investigative  (a
"Proceeding"),  based upon, arising from,  relating to, or by reason of the fact
that such person,  or a person of whom such person is the legal  representative,
is or was a  director  or officer of the  Company,  or is or was  serving at the
request of the Company as a director,  officer, partner,  trustee,  employee, or
agent of another  foreign or domestic  corporation  or  non-profit  corporation,
cooperative,  partnership,  joint  venture,  trust,  or  other  incorporated  or
unincorporated  enterprise,  or any  employee  benefit  plan or trust  (each,  a
"Company  Affiliate"),  shall be indemnified and held harmless by the Company to
the fullest  extent  authorized by the NMBCA,  as the same exists on the date of
the adoption of this Bylaw  [October  27,  1987] or as may  hereafter be amended
(but, in the case of any such amendment,  only to the extent that such amendment
permits the  Company to provide  broader  indemnification  rights than the NMBCA
permitted the Company to provide prior to such  amendment),  against any and all
expenses,  liability,  and loss (including,  without  limitation,  investigation
expenses and expert  witnesses'  and  attorneys'  fees and expenses,  judgments,
penalties,  fines,  and  amounts  paid  or to be paid  in  settlement)  actually
incurred by such person in connection therewith; provided, however, that, except
as  provided  in the  second  paragraph  of  this  Article  IV with  respect  to
Proceedings  seeking to enforce  rights  under this  Bylaw,  the  Company  shall
indemnify any such person  seeking to enforce such rights in  connection  with a
Proceeding  (or part thereof)  initiated by such person only if such  Proceeding
(or part thereof) was authorized by a two-thirds vote of the Board of Directors.
The right to  indemnification  conferred  in this Article IV shall be a contract
right and shall  include the right to be paid by the Company for  expenses to be
incurred in defending or prosecuting any such Proceeding in advance of its final
disposition.

     If a claim under the first paragraph of this Article IV is not paid in full
by the Company within thirty days after a written claim has been received by the
Company,  except in the case of a claim for expenses to be incurred in defending
a Proceeding in advance of its final  disposition  in which case the  applicable
period shall be ten days,  the claimant  may at any time  thereafter  bring suit
against the Company to recover the unpaid amount of the claim and, if successful
in whole or in part,  the claimant shall be entitled to be paid also the expense
of  prosecuting  such claim.  The  claimant  shall be presumed to be entitled to
indemnification  under this Article IV upon  submission  of a written claim (and
any required  undertaking and/or affirmations  required by the NMBCA as the same
exists on the date of the  adoption of this Bylaw  [October  27, 1987] or as may
hereafter be amended but, in the case of any such amendment,  only to the extent
that such  amendment  permits  the  Company to provide  broader  indemnification
rights than the NMBCA  permitted the Company to provide prior to such amendment)
and  thereafter  the  Company  shall  have the burden of proof to  overcome  the
presumption  that the  claimant is not so  entitled.  Neither the failure of the
Company  (including its Board of Directors,  independent  legal counsel,  or its
shareholders)  to have made a  determination  prior to the  commencement of such
action  that  indemnification  of the  claimant  is proper in the  circumstances
because such person has met the applicable  standard of conduct set forth in the
NMBCA,  nor an  actual  determination  by the  Company  (including  its Board of
Directors, independent legal counsel, or its shareholders) that the claimant has
not met such applicable standard of conduct, shall be a defense to the action or
create a presumption  that the claimant has not met the  applicable  standard of
conduct.

     The right to  indemnification  and the  payment  of  expenses  incurred  in
defending a  Proceeding  in advance of its final  disposition  conferred in this
Article IV shall not be  exclusive  of any other  right  which any person may be
entitled under any statute, provision of the Restated Articles of Incorporation,
or Bylaw, an agreement, a resolution of shareholders or directors,  or otherwise
both as to action in such person's official capacity and as to action in another
capacity while holding such office.

     The  Company  may  purchase  and  maintain  insurance  or  furnish  similar
protection,  including,  but not limited to,  providing a trust fund,  letter of
credit, or self-insurance,  on behalf of any person who is a director,  officer,
employee, or agent of the Company or who, while a director,  officer,  employee,
or agent of the Company, is serving at the request of the Company as a director,
officer,  partner, trustee,  employee, or agent of a Company Affiliate,  against
any liability asserted against and incurred by such director, officer, employee,
or  agent  in  such  capacity  or  arising  out of such  director's,  officer's,
employee's, or agent's status as such, whether or not the Company would have the
power to indemnify  such  director,  officer,  employee,  or agent  against such
liability under the NMBCA.

     The Company's  indemnity of any person who was or is serving at its request
as a  director,  officer,  partner,  trustee,  employee,  or agent of a  Company
Affiliate   shall  be  reduced  by  any  amounts  such  person  may  collect  as
indemnification from such Company Affiliate.

     The Company may, by action of its Board of Directors, authorize one or more
officers  to grant  rights to  indemnification  and  advancement  of expenses to
employees or agents of the Company on such terms and  conditions as such officer
or officers deem appropriate under the circumstances.

     Anything in this Article IV to the contrary notwithstanding, no elimination
of this Bylaw and no amendment of this Bylaw  adversely  affecting  the right of
any person to  indemnification  or  advancement of expenses  hereunder  shall be
effective until the sixtieth day following notice to such indemnified  person of
such action,  and no elimination of or amendment to this Bylaw shall deprive any
such person of such person's rights  hereunder  arising out of alleged or actual
occurrences,  acts,  or  failures  to act which had their  origin  prior to such
sixtieth day.

     In case any provision in this Article IV shall be determined at any time to
be  unenforceable  in any respect,  the other provisions shall not in any way be
affected or impaired  thereby,  and the  affected  provision  shall be given the
fullest possible enforcement in the circumstances, it being the intention of the
Company to afford  indemnification  and  advancement  of expenses to the persons
indemnified hereby to the fullest extent permitted by law.

     For purposes of this Article IV,  references  to "fines"  shall include any
excise taxes  assessed on a person with respect to any employee  benefit plan or
trust;  and  references to "serving at the request of the Company" shall include
any  service as a director,  officer,  employee,  or agent of the Company  which
imposes duties on, or involves services by, such director, officer, employee, or
agent with respect to an employee  benefit plan or trust, its  participants,  or
beneficiaries;  and a person who acted in good faith and in a manner such person
reasonably  believed to be in the interest of the participants and beneficiaries
of an employee  benefit  plan or trust shall be deemed to have acted in a manner
"not opposed to the best interests of the Company."

     The  indemnification  and  advancement of expenses  provided by, or granted
pursuant to, this Article IV shall,  unless otherwise  provided when authorized,
continue as to a person who has ceased to be a director,  officer,  employee, or
agent and shall inure to the benefit of the heirs, executors, and administrators
of such a person.

     Submission  of  this  Bylaw  to  the   shareholders   of  the  Company  for
ratification  shall  constitute  notice to the  shareholders  of the Company and
shall be the only  notice  which  the  Company  shall  be  required  to give the
shareholders  of the Company with respect to any of the matters  covered hereby,
including,  without  limitation,  the  Company's  entering into any agreement or
making  other  arrangements   providing  for  the   indemnification  of  or  the
advancement of expenses to a director,  officer,  employee, or agent, the actual
advancement  of  expenses  to a  director,  officer,  employee,  or agent of the
Company,  or the  payment of any other  liability  or  indemnification  to or on
behalf of a director, officer, employee, or agent.

ARTICLE V

Share Certificates and Transfer of Shares

     SECTION 1. SHARE  CERTIFICATES.  Shares of stock of the Company may, at the
discretion of the Board of Directors,  be represented by  certificates or may be
uncertificated.  Any share  certificates of the Company shall be in the form and
contain the provisions  determined by the Board of Directors and required by the
NMBCA.

     SECTION 2.  TRANSFER  RULES.  The Board of  Directors,  the Chairman of the
Board, the President, or the Secretary may from time to time promulgate rules or
regulations  as it or such  officer  may deem  advisable  concerning  the issue,
transfer, registration, or replacement of share certificates of the Company.

     SECTION 3. REGISTERED SHAREHOLDERS.  The Company shall be entitled to treat
the  holder of  record  of any  share or  shares as the  holder in fact of those
shares. The Company shall not be bound to recognize any equitable or other claim
to or  interest  in any shares on the part of any other  person,  regardless  of
whether  the  Company has actual or imputed  knowledge  of a claim of  interest,
except as otherwise required by the laws of New Mexico.

ARTICLE VI

Fiscal Year and Seal

     SECTION 1. FISCAL YEAR.  The fiscal year of the Company  shall begin on the
first day of January and end on the last day of December each year.

     SECTION 2. SEAL. The seal of the Company shall be circular in form.  Around
the margin of the seal shall be placed the words  "Southwestern  Public  Service
Company"  and in the  center the words  "Corporate  Seal  Incorporated  1921 New
Mexico."

ARTICLE VII

Amendments

     These Bylaws may be altered,  amended,  or repealed by the affirmative vote
of a majority of the Board of Directors at any regular  meeting or, if notice of
intention  to amend,  alter,  or repeal the Bylaws is given in the notice of the
meeting, at any special meeting of the Board of Directors. These Bylaws may also
be altered,  amended, or repealed by the shareholders by the affirmative vote of
the holders of a majority in interest of the shares issued and  outstanding  and
entitled to vote.