Exhibit 99.1

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                            SIERRA PACIFIC RESOURCES



                             (a Nevada corporation)



                        20,000,000 Shares of Common Stock





                               PURCHASE AGREEMENT







Dated:  August 9, 2006


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                                TABLE OF CONTENTS

                                                                            Page


SECTION 1.   Representations and Warranties by the Company....................2
         (a) Representations and Warranties...................................2
             (i)      Status as a Well-Known Seasoned Issuer..................2
             (ii)     Registration Statement, Prospectus and Disclosure
                      at Time of Sale.........................................3
             (iii)    Incorporated Documents..................................5
             (iv)     Independent Accountants.................................5
             (v)      Financial Statements....................................5
             (vi)     No Material Adverse Change in Business..................6
             (vii)    Good Standing of the Company............................6
             (viii)   Good Standing of Subsidiaries...........................6
             (ix)     Capitalization..........................................7
             (x)      Authorization of Agreement..............................7
             (xi)     Authorization and Description of Securities.............7
             (xii)    Absence of Defaults and Conflicts.......................7
             (xiii)   Labor...................................................8
             (xiv)    ERISA...................................................8
             (xv)     Tax.....................................................8
             (xvi)    Insurance...............................................9
             (xvii)   Absence of Proceedings..................................9
             (xviii)  Accuracy of Exhibits....................................9
             (xix)    Possession of Licenses and Permits......................9
             (xx)     Absence of Further Requirements.........................9
             (xxi)    Title to Property......................................10
             (xxii)   Leases.................................................10
             (xxiii)  Environmental Laws.....................................10
             (xxiv)   Investment Company Act.................................10
             (xxv)    Internal Controls......................................11
             (xxvi)   Compliance with Sarbanes Oxley.........................11
         (b) Officer's Certificates..........................................11

SECTION 2.   Sale and Delivery to Underwriters; Closing......................12
         (a) Initial Securities..............................................12
         (b) Option Securities...............................................12
         (c) Payment.........................................................12
         (d) Denominations; Registration.....................................13
         (e) Global Securities...............................................13

SECTION 3.   Covenants of the Company........................................13
         (a) Compliance with Securities Regulations and Commission
             Requests; Payment of Filing Fees................................13
         (b) Filing of Amendments and Exchange Act Documents.................14


                                       i


         (c) Delivery of Registration Statements.............................14
         (d) Delivery of Prospectuses........................................15
         (e) Continued Compliance with Securities Laws.......................15
         (f) Blue Sky Qualifications.........................................16
         (g) Rule 158........................................................16
         (h) Use of Proceeds.................................................16
         (i) Listing.........................................................16
         (j) Restriction on Sale of Securities...............................16
         (k) Reporting Requirements..........................................17
         (l) Issuer Free Writing Prospectuses................................17

SECTION 4.   Payment of Expenses.............................................17
         (a) Expenses........................................................17
         (b) Termination of Agreement........................................18

SECTION 5.   Conditions of Underwriters' Obligations.........................18
         (a) Effectiveness of Registration Statement; Filing of
             Prospectus; Payment of Filing Fee...............................18
         (b) Opinions of Counsel for Company.................................19
         (c) Opinion of Counsel for Underwriters.............................19
         (d) Officers' Certificate...........................................19
         (e) Accountants' Comfort Letter.....................................19
         (f) Bring-down Comfort Letter.......................................20
         (g) Approval of Listing.............................................20
         (h) Maintenance of Ratings..........................................20
         (i) Lock-up Agreements..............................................20
         (j) Conditions to Purchase of Option Securities.....................20
         (k) Additional Documents............................................21
         (l) Termination of Agreement........................................21

SECTION 6.   Indemnification.................................................21
         (a) Indemnification of Underwriters.................................21
         (b) Indemnification of Company, Directors and Officers..............22
         (c) Actions against Parties; Notification...........................23
         (d) Settlement without Consent if Failure to Reimburse..............23

SECTION 7.   Contribution....................................................23

SECTION 8.   Representations, Warranties and Agreements to Survive
             Delivery........................................................25

SECTION 9.   Termination of Agreement........................................25
         (a) Termination; General............................................25
         (b) Liabilities.....................................................25


                                       ii



SECTION 10.  Default by One or More of the Underwriters......................25

SECTION 11.  Notices.........................................................26

SECTION 12.  No Advisory or Fiduciary Relationship...........................26

SECTION 13.  Parties.........................................................27

SECTION 14.  Governing Law...................................................27

SECTION 15.  Waiver of Trial by Jury.........................................27

SECTION 16.  Time............................................................27

SECTION 17.  Counterparts....................................................27

SECTION 18.  Effect of Headings..............................................27


SCHEDULES

Schedule A - List of Underwriters and Number of Initial Securities
             to be Purchased by Each                                    Sch A-1

Schedule B - Pricing Information                                        Sch B-1

Schedule C - List of Persons Subject to Lock-up                         Sch C-1

Schedule D - List of All Issuer General Use Free Writing Prospectuses   Sch D-1



EXHIBITS

Exhibit A - Contents of Opinion of Woodburn & Wedge                         A-1

Exhibit B - Contents of Opinion of Choate, Hall & Stewart LLP               B-1

Exhibit C - Form of Lock-up Letter                                          C-1




                                      iii



                            SIERRA PACIFIC RESOURCES
                             (a Nevada corporation)


                        20,000,000 Shares of Common Stock

                               PURCHASE AGREEMENT

                                                                  August 9, 2006

Deutsche Bank Securities Inc.
60 Wall Street
New York, New York 10005

                  Sierra Pacific Resources, a Nevada corporation (the
"COMPANY"), confirms its agreement with Deutsche Bank Securities Inc.
("Deutsche") and each of the other Underwriters named in Schedule A hereto
(collectively, the "UNDERWRITERS", which term shall also include any
underwriters substituted as hereinafter provided in Section 10 hereof), for whom
Deutsche is acting as representative (in such capacity, the "REPRESENTATIVE"),
with respect to (i) the issue and sale by the Company and the purchase by the
Underwriters, acting severally and not jointly, of the respective numbers of
shares of Common Stock, par value $1.00 per share, of the Company ("Common
Stock") set forth in Schedule A hereto and (ii) the grant by the Company to the
Underwriters, acting severally and not jointly, of the option described in
Section 2(b) hereof to purchase all or any part of 3,000,000 additional shares
of Common Stock to cover over-allotments, if any. The aforesaid 20,000,000
shares of Common Stock (the "INITIAL SECURITIES") to be purchased by the
Underwriters and all or any part of the 3,000,000 shares of Common Stock subject
to the option described in Section 2(b) hereof (the "OPTION SECURITIES") are
hereinafter called, collectively, the "Securities".

                  To the extent there is only one Underwriter named in Schedule
A hereto, the terms "Representative" and "Underwriters" as used herein shall
mean such Underwriter.

                  The Company has filed with the Securities and Exchange
Commission (the "COMMISSION") an automatic shelf registration statement on Form
S-3 (No. 333-135752), including the related preliminary prospectus or
prospectuses, which registration statement became effective upon filing under
Rule 462(e) of the rules and regulations of the Commission (the "1933 ACT
REGULATIONS") under the Securities Act of 1933, as amended (the "1933 ACT").
Such registration statement covers the registration of the Securities under the
1933 Act. Promptly after execution and delivery of this Agreement, the Company
will prepare and file a prospectus in accordance with the provisions of Rule
430B ("RULE 430B") of the 1933 Act Regulations and paragraph (b) of Rule 424
("RULE 424(b)") of the 1933 Act Regulations. Any information included in such
prospectus that was omitted from such registration statement at the time it
became effective but that is deemed to be part of and included in such
registration statement pursuant to Rule 430B is referred to as "RULE 430B
INFORMATION". Each prospectus used in connection with the



offering of the Securities that omitted Rule 430B Information (other than a
"free writing prospectus" that is not a Permitted Free Writing Prospectus (as
hereinafter defined)) is herein called a "preliminary prospectus." Such
registration statement, at any given time, including the amendments thereto to
such time, the exhibits and any schedules thereto at such time, the documents
incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933
Act at such time and the documents otherwise deemed to be a part thereof or
included therein by 1933 Act Regulations, is herein called the "REGISTRATION
STATEMENT". The Registration Statement at the time it originally became
effective is herein called the "ORIGINAL REGISTRATION STATEMENT". The final
prospectus in the form first furnished to the Underwriters for use in connection
with the offering of the Securities, including the documents incorporated by
reference therein pursuant to Item 12 of Form S-3 under the 1933 Act at the time
of the execution of this Agreement and any preliminary prospectuses that form a
part thereof, is herein called the "PROSPECTUS". For purposes of this Agreement,
all references to the Registration Statement, any preliminary prospectus, the
Prospectus or any amendment or supplement to any of the foregoing shall be
deemed to include the copy filed with the Commission pursuant to its Electronic
Data Gathering, Analysis and Retrieval system ("EDGAR"). This Agreement shall
become effective when each party hereto shall have delivered an executed
counterpart hereof to the other.

                  All references in this Agreement to financial statements and
schedules and other information which is "contained," "included" or "stated" in
the Registration Statement, any preliminary prospectus or the Prospectus (or
other references of like import) shall be deemed to mean and include all such
financial statements and schedules and other information which is incorporated
by reference in or otherwise deemed by 1933 Act Regulations to be a part of or
included in the Registration Statement, any preliminary prospectus or the
Prospectus, as the case may be; and all references in this Agreement to
amendments or supplements to the Registration Statement, any preliminary
prospectus or the Prospectus shall be deemed to mean and include the filing of
any document under the Securities Exchange Act of 1934, as amended (the "1934
ACT"), which is incorporated by reference in or otherwise deemed by 1933 Act
Regulations to be a part of or included in the Registration Statement, such
preliminary prospectus or the Prospectus, as the case may be.

         SECTION 1. Representations and Warranties by the Company.

         (a)      Representations and Warranties. The Company represents and
warrants to each Underwriter as of the time of effectiveness of this Agreement,
as of the Applicable Time referred to in Section 1(a)(ii) hereof and as of the
Closing Time referred to in Section 2(c) hereof, and agrees with each
Underwriter, as follows:

         (i)      Status as a Well-Known Seasoned Issuer. (A) At the time of
filing the Original Registration Statement, (B) at the time of the most recent
amendment thereto for the purposes of complying with Section 10(a)(3) of the
1933 Act (whether such amendment was by post-effective amendment, incorporated
report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of
prospectus), (C) at the earliest time after each of the times referred to in (A)
and (B) above that the Company or another offering


                                       2


participant made a bona fide offer within the meaning of Rule 164(h)(2) of the
1933 Act Regulations, (D) at the time the Company or any person acting on its
behalf (within the meaning, for this clause only, of Rule 163(c) of the 1933 Act
Regulations) made any offer relating to the Securities in reliance on the
exemption of Rule 163 of the 1933 Act Regulations and (E) at the time of
effectiveness of this Agreement and at the Closing Time, the Company (X) was, is
and will be a "well-known seasoned issuer", as defined in Rule 405 of the 1933
Act Regulations ("RULE 405") and (Y) was not, is not and will not be an
"ineligible issuer", as defined in Rule 405. The Registration Statement is an
"automatic shelf registration statement," as defined in Rule 405, and the
Securities, since their registration on the Registration Statement, have been
and remain eligible for registration by the Company on a Rule 405 "automatic
shelf registration statement". The Company has not received from the Commission
any notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations objecting to
the use of the automatic shelf registration statement form.

         (ii)     Registration Statement, Prospectus and Disclosure at Time of

Sale. The Original Registration Statement became effective upon filing under
Rule 462(e) of the 1933 Act Regulations ("RULE 462(e)") on July 13, 2006, and
any post-effective amendment thereto shall also become effective upon filing
with the Commission under Rule 462(e). No stop order suspending the
effectiveness of the Registration Statement has been issued under the 1933 Act
and no proceedings for that purpose have been instituted or are pending or, to
the knowledge of the Company, are contemplated by the Commission, and any
request on the part of the Commission for additional information has been
complied with.

                  Any offer that is a written communication relating to the
Securities made prior to the filing of the Original Registration Statement by
the Company or any person acting on its behalf (within the meaning, for this
paragraph only, of Rule 163(c) of the 1933 Act Regulations) has been filed with
the Commission in accordance with the exemption provided by Rule 163 of the 1933
Act Regulations ("RULE 163") and otherwise complied with the requirements of
Rule 163, including without limitation the legending requirement, to qualify
such offer for the exemption from Section 5(c) of the 1933 Act provided by Rule
163.

                  At the respective times the Original Registration Statement
and each amendment thereto became effective, at each deemed effective date with
respect to the Underwriters pursuant to Rule 430B(f)(2) of the 1933 Act
Regulations, at the time of effectiveness of this Agreement and at the Closing
Time, the Registration Statement complied and will comply in all material
respects with the requirements of the 1933 Act and the 1933 Act Regulations, and
did not and will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading.

                  Neither the Prospectus nor any amendments or supplements
thereto, at the time the Prospectus or any such amendment or supplement is
issued and at the Closing Time, will include an untrue statement of a material
fact or will omit to state a material


                                       3


fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading.

                  Each preliminary prospectus (including the prospectus or
prospectuses filed as part of the Original Registration Statement or any
amendment thereto) complied when so filed in all material respects with the 1933
Act Regulations and each preliminary prospectus and the Prospectus delivered to
the Underwriters for use in connection with this offering was identical to the
electronically transmitted copies thereof filed with the Commission pursuant to
EDGAR, except to the extent permitted by Regulation S-T.

                  As of the Applicable Time, as of the time of effectiveness of
this Agreement and as of the Closing Time neither (x) the Issuer General Use
Free Writing Prospectus(es) (as defined below) issued at or prior to the
Applicable Time (as defined below), the Statutory Prospectus (as defined below)
and the information included on Schedule B hereto, all considered together
(collectively, the "DISCLOSURE PACKAGE"), nor (y) any individual Issuer Limited
Use Free Writing Prospectus, when considered together with the Disclosure
Package, included, includes or will include any untrue statement of a material
fact or omitted, omits or will omit to state any material fact necessary in
order to make the statements therein, in the light of the circumstances under
which they were made, not misleading.

                  As used in this subsection and elsewhere in this Agreement:

                  "APPLICABLE TIME" means 9:30 P.M. (Eastern time) on August 9,
2006 or such other time as agreed by the Company and the Representative.

                  "ISSUER FREE WRITING PROSPECTUS" means any "issuer free
writing prospectus," as defined in Rule 433 of the 1933 Act Regulations ("RULE
433"), relating to the Securities that (i) is required to be filed with the
Commission by the Company, (ii) is a "road show that is a written communication"
within the meaning of Rule 433(d)(8)(i), whether or not required to be filed
with the Commission or (iii) is exempt from filing pursuant to Rule 433(d)(5)(i)
because it contains a description of the Securities or of the offering that does
not reflect the final terms, in each case in the form filed or required to be
filed with the Commission or, if not required to be filed, in the form retained
in the Company's records pursuant to Rule 433(g).

                  "ISSUER GENERAL USE FREE WRITING PROSPECTUS" means any Issuer
Free Writing Prospectus that is intended for general distribution to prospective
investors, as evidenced by its being specified in Schedule D hereto.

                  "ISSUER LIMITED USE FREE WRITING PROSPECTUS" means any Issuer
Free Writing Prospectus that is not an Issuer General Use Free Writing
Prospectus.

                  "PERMITTED FREE WRITING PROSPECTUS" has the meaning specified
in Section 3(l) hereof.

                  "STATUTORY PROSPECTUS" as of any time means the prospectus
relating to the Securities that is included in the Registration Statement
immediately prior to that


                                       4


time, including any document incorporated by reference therein and any
preliminary or other prospectus deemed to be a part thereof.

                  Each Issuer Free Writing Prospectus, as of its issue date and
at all subsequent times through the completion of the public offering and sale
of the Securities or until any earlier date that the Company notified or
notifies the Representative as described in Section 3(e), did not, does not and
will not include any information that conflicted, conflicts or will conflict
with the information contained in the Registration Statement or the Prospectus,
including any document incorporated by reference therein and any preliminary or
other prospectus deemed to be a part thereof that has not been superseded or
modified.

                  The representations and warranties in this subsection shall
not apply to statements in or omissions from the Registration Statement, the
Prospectus or any Issuer Free Writing Prospectus made in reliance upon and in
conformity with written information furnished to the Company by any Underwriter
through the Representative expressly for use therein.

         (iii)    Incorporated Documents. The documents incorporated or deemed
to be incorporated by reference in the Registration Statement and the
Prospectus, at the time they were or hereafter are filed with the Commission,
complied and will comply in all material respects with the requirements of the
1934 Act and the rules and regulations of the Commission thereunder (the "1934
ACT REGULATIONS"), and, when read together with the other information in the
Prospectus, (a) at the time the Original Registration Statement became
effective, (b) at the Applicable Time, (c) at the time the Prospectus is first
used and (d) at the Closing Time, did not and will not contain an untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading.

         (iv)     Independent Accountants. Deloitte & Touche LLP, which
certified certain of the financial statements and supporting schedules of the
Company and its consolidated subsidiaries included in the Registration Statement
and whose report appears in the Registration Statement (A) is a registered
public accounting firm and is independent with respect to the Company and its
subsidiaries, each within the meaning of the 1934 Act and (B) is in compliance
with subsections (g), (h), (j), (k) and (l), and, to our knowledge, (b), of
Section 10A of the 1934 Act with respect to the Company and its subsidiaries.

         (v)      Financial Statements. The financial statements included in the
Registration Statement, the Disclosure Package and the Prospectus, together with
the related schedules and notes, present fairly the financial position of the
Company and its consolidated subsidiaries at the dates indicated and the results
of operations, changes in stockholders' equity and cash flows of the Company and
its consolidated subsidiaries for the periods specified subject, in the case of
the unaudited interim financial statements, to normal year-end audit adjustments
and the absence of complete notes (to the extent permitted by the 1934 Act
Regulations); said financial statements have been prepared in conformity with
generally accepted accounting principles ("GAAP") applied on a


                                       5


consistent basis, except as noted therein, throughout the periods involved. The
supporting schedules, if any, present fairly in accordance with GAAP the
information required to be stated therein. The selected financial data and the
summary financial information included in the Registration Statement, the
Disclosure Package and Prospectus present fairly the information shown therein,
subject as aforesaid with respect to the unaudited interim financial statements,
and have been compiled on a basis consistent with that of the audited financial
statements included therein. The financial statements included in the
Registration Statement, Disclosure Package and Prospectus do not contain
non-GAAP financial measures within the meaning of Regulation G or Item 10 of
Regulation S-K of the Commission. Except as disclosed in the Registration
Statement, Disclosure Package and Prospectus, neither the Company nor any of its
subsidiaries has any off-balance sheet arrangements of the character
contemplated by Item 303 of Regulation S-K or otherwise by Section 13(j) of the
1934 Act, or has any other contingent obligation or liability, which, in any
case, is material, or is reasonably likely to be material, to the Company and
its consolidated subsidiaries considered as one enterprise. (vi) No Material
Adverse Change in Business. Since the respective dates as of which information
is given in the Registration Statement, the Disclosure Package or the
Prospectus, except as otherwise stated therein, (A) there has been no material
adverse change, or any development which is reasonably likely to result in a
material adverse change, in the condition, financial or otherwise, results of
operations or business affairs of the Company and its subsidiaries considered as
one enterprise, whether or not arising in the ordinary course of business (any
such change or development, a "MATERIAL ADVERSE CHANGE"), (B) there have been no
transactions entered into by the Company or any of its subsidiaries, other than
those in the ordinary course of business, which are material with respect to the
Company and its subsidiaries considered as one enterprise and (C) there has been
no dividend or distribution of any kind declared, paid or made by the Company on
any class of its capital stock.

         (vii)    Good Standing of the Company. The Company has been duly
organized and is validly existing as a corporation in good standing under the
laws of the State of Nevada and has corporate power and authority to own, lease
and operate its properties and to conduct its business as described in the
Prospectus and to enter into and perform its obligations under this Agreement;
and the Company is duly qualified as a foreign corporation to transact business
and is in good standing in each other jurisdiction in which such qualification
is required, whether by reason of the ownership or leasing of property or the
conduct of business, except where the failure so to qualify or to be in good
standing would not have a material adverse effect, and would not result in any
development which is reasonably likely to have a material adverse effect, on the
condition, financial or otherwise, results of operations or business affairs of
the Company and its subsidiaries considered as one enterprise, whether or not
arising in the ordinary course of business (any such effect or development, a
"MATERIAL ADVERSE EFFECT").

         (viii)   Good Standing of Subsidiaries. Each Significant Subsidiary (as
defined below) of the Company has been duly organized and is validly existing as
a corporation in good standing under the laws of its jurisdiction of
organization, has corporate power


                                       6


and authority to own, lease and operate its properties and to conduct its
business as described in the Prospectus; and each Significant Subsidiary is duly
qualified as a foreign corporation to transact business and is in good standing
in each jurisdiction in which such qualification is required, whether by reason
of the ownership or leasing of property or the conduct of business, except where
the failure so to qualify or to be in good standing would not result in a
Material Adverse Effect. The shares of issued and outstanding capital stock of
each Significant Subsidiary have been duly authorized and validly issued and are
fully paid and non-assessable; none of the issued and outstanding shares of
capital stock of either Significant Subsidiary was issued in violation of any
preemptive or other similar rights of any securityholder of such Significant
Subsidiary; and all shares of capital stock of each Significant Subsidiary are
owned by the Company, free and clear of any security interests and other liens
and encumbrances and of any equities, claims and other adverse interests. Nevada
Power Company and Sierra Pacific Power Company, each a Nevada corporation (and
each a "SIGNIFICANT SUBSIDIARY"), are each a "significant subsidiary" within the
meaning of Rule 405 under the 1933 Act, and the Company has no other such
significant subsidiary.

         (ix)     Capitalization. The authorized, issued and outstanding capital
stock of the Company is as set forth in the Registration Statement, the
Disclosure Package and the Prospectus. The shares of issued and outstanding
capital stock of the Company have been duly authorized and validly issued and
are fully paid and non-assessable; and none of the issued and outstanding shares
of capital stock of the Company was issued in violation of any preemptive or
other similar rights of any securityholder of the Company.

         (x)      Authorization of Agreement. The Company has all corporate
power and authority necessary to execute and deliver this Agreement, to perform
its obligations hereunder and to consummate the transactions contemplated
hereby. This Agreement has been duly authorized, executed and delivered by the
Company.

         (xi)     Authorization and Description of Securities. The Securities to
be purchased by the Underwriters from the Company have been duly authorized for
issuance and sale to the Underwriters pursuant to this Agreement and, when
issued and delivered by the Company pursuant to this Agreement against payment
of the consideration set forth herein, will be validly issued and fully paid and
non-assessable; the Common Stock conforms to all statements relating thereto
contained in the Registration Statement, the Disclosure Package and the
Prospectus and such description conforms to the rights set forth in the
instruments defining the same; no holder of the Securities will be subject to
personal liability by reason of being such a holder; and the issuance of the
Securities is not subject to the preemptive or other similar rights of any
securityholder of the Company.

         (xii)    Absence of Defaults and Conflicts. Neither the Company nor any
of its Significant Subsidiaries is in violation of its charter or by-laws or in
default in the performance or observance of any obligation, agreement, covenant
or condition contained in any contract, indenture, mortgage, deed of trust, loan
or credit agreement, note, lease or other agreement or instrument to which the
Company or any of its Significant Subsidiaries is a party or by which any of
them may be bound, or to which any of the



                                       7


property or assets of the Company or any of its Significant Subsidiaries is
subject (collectively, "AGREEMENTS AND INSTRUMENTS") except for such defaults as
would not result in a Material Adverse Effect; and the execution, delivery and
performance by the Company of this Agreement, and the consummation of the
transactions contemplated herein and in the Registration Statement (including
the issuance and sale of the Securities and the use of the proceeds from the
sale of the Securities as described in the Prospectus under the caption "Use of
Proceeds") and compliance by the Company with its obligations hereunder have
been duly authorized by all necessary corporate action and do not and will not,
whether with or without the giving of notice or passage of time or both,
conflict with or constitute a breach of, or default or a Repayment Event (as
defined below) under, or result in the creation or imposition of any lien,
charge or encumbrance upon any property or assets of the Company or any of its
Significant Subsidiaries pursuant to, the Agreements and Instruments except for
such conflicts, breaches or defaults or liens, charges or encumbrances that,
singly or in the aggregate, would not result in a Material Adverse Effect, nor
will such action result in any violation of the provisions of the charter or
by-laws of the Company or any of its Significant Subsidiaries or any applicable
law, statute, rule, regulation, judgment, order, writ or decree of any
government, government instrumentality or court, domestic or foreign, having
jurisdiction over the Company or any of its Significant Subsidiaries or any of
their assets, properties or operations. As used herein, a "REPAYMENT EVENT"
means any event or condition which gives the holder of any note, debenture or
other evidence of indebtedness (or any person acting on such holder's behalf)
the right to require the repurchase, redemption or repayment of all or a portion
of such indebtedness by the Company or any of its Significant Subsidiaries.

         (xiii)   Labor. No labor disturbance by the employees of the Company or
any of its subsidiaries exists or, to the knowledge of the Company or any of its
Significant Subsidiaries, is imminent, which might be expected to have a
Material Adverse Effect.

         (xiv)    ERISA. The Company is in compliance in all material respects
with all applicable provisions of the Employee Retirement Income Security Act of
1974, as amended, including the regulations and published interpretations
thereunder ("ERISA"); no "reportable event" (as defined in ERISA) has occurred
with respect to any "pension plan" (as defined in ERISA) for which the Company
would have any material liability; the Company has not incurred and the Company
does not expect to incur material liability under (i) Title IV of ERISA with
respect to termination of, or withdrawal from, any "pension plan" or (ii)
Sections 412 or 4971 of the Internal Revenue Code of 1986, as amended, including
the regulations and published interpretations thereunder (the "CODE"); and each
"pension plan" for which the Company would have any liability that is intended
to be qualified under Section 401(a) of the Code is so qualified in all material
respects and to the Company's knowledge nothing has occurred, whether by action
or by failure to act, which might reasonably be expected to cause the loss of
such qualification.

         (xv)     Tax. Each of the Company and its Significant Subsidiaries has
filed all federal, state and local income and franchise tax returns required to
be filed through the date hereof and has paid all taxes due thereon, and no tax
deficiency has been determined adversely to the Company or any of its
Significant Subsidiaries which has had, nor does


                                       8


the Company have any knowledge of any tax deficiency which, if determined
adversely to the Company or any of its Significant Subsidiaries, might have, a
Material Adverse Effect.

         (xvi)    Insurance. The Company and its Significant Subsidiaries carry,
or are covered by, insurance in such amounts and covering such risks that the
Company reasonably believes is adequate for the conduct of their respective
businesses and the value of their respective properties and as is customary for
companies engaged in similar businesses in similar industries.

         (xvii)   Absence of Proceedings. Except as disclosed in the
Registration Statement, the Disclosure Package and the Prospectus, there is no
action, suit, proceeding, inquiry or investigation before or brought by any
court or governmental agency or body, domestic or foreign, now pending, or, to
the knowledge of the Company, threatened, against or affecting the Company or
any of its Significant Subsidiaries which, singly or in the aggregate, might
reasonably be expected to result in a Material Adverse Effect, or which might
reasonably be expected to materially and adversely affect the consummation of
the transactions contemplated by this Agreement or the performance by the
Company of its obligations hereunder.

         (xviii)  Accuracy of Exhibits. There are no contracts or documents
which are required to be described in the Registration Statement, the Disclosure
Package, the Prospectus or the documents incorporated by reference therein or to
be filed as exhibits thereto which have not been so described and filed as
required.

         (xix)    Possession of Licenses and Permits. The Company and its
Significant Subsidiaries possess such permits, licenses, approvals, consents and
other authorizations (collectively, "GOVERNMENTAL LICENSES") issued by the
appropriate federal, state, local or foreign regulatory agencies or bodies
necessary to conduct the business now operated by them except where the failure
to possess such Governmental Licenses would not have a Material Adverse Effect;
the Company and its Significant Subsidiaries are in compliance with the terms
and conditions of all such Governmental Licenses, except where the failure so to
comply would not, singly or in the aggregate, have a Material Adverse Effect;
all of the Governmental Licenses are valid and in full force and effect, except
where the invalidity of such Governmental Licenses or the failure of such
Governmental Licenses to be in full force and effect would not have a Material
Adverse Effect; and neither the Company nor any of its Significant Subsidiaries
has received any notice of proceedings relating to the revocation or
modification of any such Governmental Licenses which, singly or in the
aggregate, if the subject of an unfavorable decision, ruling or finding, would
result in a Material Adverse Effect.

         (xx)     Absence of Further Requirements. No filing with, or
authorization, approval, consent, license, order, registration, qualification or
decree of, any court or governmental authority or agency is necessary or
required for the performance by the Company of its obligations hereunder, in
connection with the offering, issuance or sale of the Securities hereunder or
the consummation of the transactions contemplated by this


                                       9


Agreement, except such as have been already obtained or as may be required under
the 1933 Act or the 1933 Act Regulations or state securities laws.

         (xxi)    Title to Property. The Company and its Significant
Subsidiaries have good title to all real property and personal property owned by
them, in each case free and clear of all liens, encumbrances, equities or claims
except such as are described or contemplated in the Registration Statement, the
Disclosure Package and the Prospectus or would not, individually or in the
aggregate, have a Material Adverse Effect and do not materially interfere with
the use made or to be made of such property by the Company and its Significant
Subsidiaries.

         (xxii)   Leases. All of the leases and subleases material to the
business of the Company and each of its Significant Subsidiaries and under which
the Company or any of its Significant Subsidiaries holds properties described in
the Registration Statement, the Disclosure Package or the Prospectus, are in
full force and effect, and neither the Company nor any of its Significant
Subsidiaries has any notice of any material claim of any sort that has been
asserted by anyone adverse to the rights of the Company or any of its
Significant Subsidiaries under any of the leases or subleases mentioned above,
or affecting or questioning the rights of such Company or any Significant
Subsidiaries thereof to the continued possession of the leased or subleased
premises under any such lease or sublease.

         (xxiii)  Environmental Laws. Except as described in the Registration
Statement, the Disclosure Package and the Prospectus and except such matters as
would not, singly or in the aggregate, result in a Material Adverse Effect, (A)
neither the Company nor any of its subsidiaries is in violation of any federal,
state, local or foreign statute, law, rule, regulation, ordinance, code, policy
or rule of common law or any judicial or administrative interpretation thereof,
including any judicial or administrative order, consent, decree or judgment,
relating to pollution or protection of human health, the environment (including,
without limitation, ambient air, surface water, groundwater, land surface or
subsurface strata) or wildlife, including, without limitation, laws and
regulations relating to the release or threatened release of chemicals,
pollutants, contaminants, wastes, toxic substances, hazardous substances,
petroleum or petroleum products (collectively, "HAZARDOUS MATERIALS") or to the
manufacture, processing, distribution, use, treatment, storage, disposal,
transport or handling of Hazardous Materials (collectively, "ENVIRONMENTAL
LAWS"), (B) the Company and its subsidiaries have all permits, authorizations
and approvals required under any applicable Environmental Laws and are each in
compliance with their requirements, (C) there are no pending or threatened
administrative, regulatory or judicial actions, suits, demands, demand letters,
claims, liens, notices of noncompliance or violation, investigation or
proceedings relating to any Environmental Law against the Company or any of its
subsidiaries.

         (xxiv)   Investment Company Act. The Company is not required, and upon
the issuance and sale of the Securities as herein contemplated and the
application of the net proceeds therefrom as described in the Prospectus will
not be required to register as an



                                       10


"investment company" or an entity "controlled" by an "investment company" as
such terms are defined in the Investment Company Act of 1940, as amended (the
"1940 ACT").

         (xxv)    Internal Controls. (A) The Company has devised and established
and maintains the following, among other, internal controls (without
duplication):

                           (I)      a system of "internal accounting controls"
                  as contemplated in Section 13(b)(2)(B) of the 1934 Act;

                           (II)     "disclosure controls and procedures" as such
                  term is defined in Rule 13a-15(e) under the 1934 Act; and

                           (III)    "internal control over financial reporting"
                  (as such term is defined in Rule 13a-15(f) under the 1934 Act)
                  (the internal controls referred to in clauses (I) and (II)
                  above and this clause (III) being hereinafter called,
                  collectively, the "INTERNAL CONTROLS").

                           (B)      The Internal Controls are evaluated by the
         Company's senior management periodically as appropriate and, in any
         event, as required by law.

                           (C)      The Internal Controls are, individually and
         in the aggregate, effective in all material respects to perform the
         functions for which they were established.

                           (D)      Based on the most recent evaluations of the
         Internal Controls, (I) there are no material weaknesses in the design
         or operation of the Internal Controls, whether considered individually
         or collectively, and (II) all significant deficiencies, if any, in the
         design or operation of the Internal Controls have been identified and
         reported to the Company's independent auditors and the audit committee
         of the Company's board of directors; and all deficiencies which,
         individually or in the aggregate, could constitute significant
         deficiencies and which have not yet been rectified (X) are in the
         process of being rectified and (Y) have not had and will not have,
         individually or in the aggregate, a material adverse effect on the
         effectiveness of the Internal Controls.

         (xxvi)   Compliance with Sarbanes Oxley. The Company is in compliance
in all material respects with the Sarbanes-Oxley Act of 2002 and the rules and
regulations of the Commission and the New York Stock Exchange that have been
adopted thereunder, all to the extent that such Act and such rules and
regulations are in effect and applicable to the Company.

         (b)      Officer's Certificates. Any certificate signed by any officer
of the Company or any of its subsidiaries delivered to the Representative or to
counsel for the Underwriters shall be deemed a representation and warranty by
the Company to each Underwriter as to the matters covered thereby.



                                       11


         SECTION 2. Sale and Delivery to Underwriters; Closing.


         (a)      Initial Securities. On the basis of the representations and
warranties herein contained and subject to the terms and conditions herein set
forth, the Company agrees to sell to each Underwriter, severally and not
jointly, and each Underwriter, severally and not jointly, agrees to purchase
from the Company, at the price per share set forth in Schedule B, the number of
Initial Securities set forth in Schedule A opposite the name of such
Underwriter, plus any additional number of Initial Securities which such
Underwriter may become obligated to purchase pursuant to the provisions of
Section 10 hereof, subject, in each case, to such adjustments among the
Underwriters as the Representative in its sole discretion shall make to
eliminate any sales or purchases of fractional securities.

         (b)      Option Securities. In addition, on the basis of the
representations and warranties herein contained and subject to the terms and
conditions herein set forth, the Company, acting severally and not jointly,
hereby grants an option to the Underwriters, severally and not jointly, to
purchase up to an additional 3,000,000 shares of Common Stock, at the price per
share set forth in Schedule B, less an amount per share equal to any dividends
or distributions declared by the Company and payable on the Initial Securities
but not payable on the Option Securities. The option hereby granted will expire
30 days after the date hereof and may be exercised in whole or in part from time
to time only for the purpose of covering overallotments which may be made in
connection with the offering and distribution of the Initial Securities upon
notice by the Representative to the Company setting forth the number of Option
Securities as to which the several Underwriters are then exercising the option
and the time and date of payment and delivery for such Option Securities. Any
such time and date of delivery (a "DATE OF DELIVERY") shall be determined by the
Representative, but shall not be later than seven full business days after the
exercise of said option, nor in any event prior to the Closing Time, as
hereinafter defined. If the option is exercised as to all or any portion of the
Option Securities, each of the Underwriters, acting severally and not jointly,
will purchase that proportion of the total number of Option Securities then
being purchased which the number of Initial Securities set forth in Schedule A
opposite the name of such Underwriter bears to the total number of Initial
Securities, subject in each case to such adjustments as the Representative in
its discretion shall make to eliminate any sales or purchases of fractional
shares.

         (c)      Payment. Payment of the purchase price for, and delivery of
certificates for, the Securities shall be made at the offices of Choate, Hall &
Stewart LLP, counsel for the Company, at Two International Place, Boston, MA
02110, or at such other place as shall be agreed upon by the Representative and
the Company, at 10:00 A.M. (Eastern time) on the third business day after the
date hereof (unless postponed in accordance with the provisions of Section 10),
or such other time not later than ten business days after such date as shall be
agreed upon by the Representative and the Company (such time and date of payment
and delivery being herein called "CLOSING TIME").

                  In addition, in the event that any or all of the Option
Securities are purchased by the Underwriters, payment of the purchase price for,
and delivery of


                                       12


certificates for, such Option Securities shall be made at the above-mentioned
offices, or at such other place as shall be agreed upon by the Representative
and the Company, on each Date of Delivery as specified in the notice from the
Representative to the Company.

                  Payment shall be made to the Company by wire transfer of
immediately available funds to a bank account designated by the Company, against
delivery to the Representative for the respective accounts of the Underwriters
of certificates for the Securities to be purchased by them. It is understood
that each Underwriter has authorized the Representative, for its account, to
accept delivery of, receipt for, and make payment of the purchase price for, the
Initial Securities and the Option Securities, if any, which it has agreed to
purchase. The Representative, individually and not as representative of the
Underwriters, may (but shall not be obligated to) make payment of the purchase
price for the Initial Securities and the Option Securities, if any, to be
purchased by any Underwriter whose funds have not been received by the Closing
Time, but such payment shall not relieve such Underwriter from its obligations
hereunder.

         (d)      Denominations; Registration. Certificates for the Initial
Securities and the Option Securities, if any, shall be in such denominations and
registered in such names as the Representative may request in writing at least
one full business day before the Closing Time or the relevant Date of Delivery,
as the case may be. Subject to the provisions of subsection (e) below, the
certificates for the Initial Securities and the Option Securities, if any, will
be made available for examination and packaging by the Representative in New
York, New York not later than 2:00 P.M. (Eastern time) on the business day prior
to the Closing Time or the relevant Date of Delivery, as the case may be.

         (e)      Global Securities. In lieu of the delivery to the Underwriters
of certificates representing the Securities at the Closing Time and on each Date
of Delivery, as contemplated above, the Company, with the approval of the
Representative, may deliver one or more global Securities to a custodian for The
Depository Trust Company ("DTC"), to be held by DTC initially for the accounts
of the several Underwriters.

         SECTION 3. Covenants of the Company.

         (a)      Compliance with Securities Regulations and Commission
Requests; Payment of Filing Fees. The Company, subject to Section 3(b), will
comply with the requirements of Rule 430B and will notify the Representative
immediately, and confirm the notice in writing, (i) when any post-effective
amendment to the Registration Statement or new registration statement relating
to the Securities shall become effective, or any supplement to the Prospectus or
any amended Prospectus shall have been filed, (ii) of the receipt of any
comments from the Commission, (iii) of any request by the Commission for any
amendment to the Registration Statement or the filing of a new registration
statement or any amendment or supplement to the Prospectus or any document
incorporated by reference therein or otherwise deemed to be a part thereof or
for additional information, (iv) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement or such new
registration statement or of any order preventing or suspending the use of any
preliminary prospectus,


                                       13


or of the suspension of the qualification of the Securities for offering or sale
in any jurisdiction, or of the initiation or threatening of any proceedings for
any of such purposes or of any examination pursuant to Section 8(e) of the 1933
Act concerning the Registration Statement and (v) if the Company becomes the
subject of a proceeding under Section 8A of the 1933 Act in connection with the
offering of the Securities. The Company will effect the filings required under
Rule 424(b), in the manner and within the time period required by Rule 424(b)
(without reliance on Rule 424(b)(8)), and will take such steps as it deems
necessary to ascertain promptly whether the form of prospectus transmitted for
filing under Rule 424(b) was received for filing by the Commission and, in the
event that it was not, it will promptly file such prospectus. The Company will
make every reasonable effort to prevent the issuance of any stop order and, if
any stop order is issued, to obtain the lifting thereof at the earliest possible
moment. The Company shall pay the required Commission filing fees relating to
the Securities within the time required by Rule 456(b)(1) (i) of the 1933 Act
Regulations without regard to the proviso therein and otherwise in accordance
with Rules 456(b) and 457(r) of the 1933 Act Regulations (including, if
applicable, by updating the "Calculation of Registration Fee" table in
accordance with Rule 456(b)(1)(ii) either in a post-effective amendment to the
Registration Statement or on the cover page of a prospectus filed pursuant to
Rule 424(b)).

         (b)      Filing of Amendments and Exchange Act Documents. The Company
will give the Representative notice of its intention to file or prepare any
amendment to the Registration Statement or new registration statement relating
to the Securities or any amendment, supplement or revision to either any
preliminary prospectus (including any prospectus included in the Original
Registration Statement or amendment thereto at the time it became effective) or
to the Prospectus, whether pursuant to the 1933 Act, the 1934 Act or otherwise,
and the Company will furnish the Representative with copies of any such
documents a reasonable amount of time prior to such proposed filing or use, as
the case may be, and will not file or use any such document to which the
Representative or counsel for the Underwriters shall reasonably object. The
Company has given the Representative notice of any filings made pursuant to the
1934 Act or 1934 Act Regulations within 48 hours prior to the Applicable Time;
the Company will give the Representative notice of its intention to make any
such filing from the Applicable Time to the Closing Time and will furnish the
Representative with copies of any such documents a reasonable amount of time
prior to such proposed filing and will not file or use any such document to
which the Representative or counsel for the Underwriters shall object.

         (c)      Delivery of Registration Statements. The Company has furnished
or will deliver to the Representative and counsel for the Underwriters, without
charge, signed copies of the Original Registration Statement and of each
amendment thereto (including exhibits filed therewith or incorporated by
reference therein and documents incorporated or deemed to be incorporated by
reference therein or otherwise deemed to be a part thereof) and signed copies of
all consents and certificates of experts, and will also deliver to the
Representative, without charge, a conformed copy of the Original Registration
Statement and of each amendment thereto (without exhibits) for each of the
Underwriters. The copies of the Original Registration Statement and each
amendment


                                       14


thereto furnished to the Underwriters will be identical to the electronically
transmitted copies thereof filed with the Commission pursuant to EDGAR, except
to the extent permitted by Regulation S-T.

         (d)      Delivery of Prospectuses. The Company has delivered to each
Underwriter, without charge, as many copies of each preliminary prospectus as
such Underwriter reasonably requested, and the Company hereby consents to the
use of such copies for purposes permitted by the 1933 Act. The Company will
furnish to each Underwriter, without charge, during the period when the
Prospectus is required to be delivered under the 1933 Act, such number of copies
of the Prospectus (as amended or supplemented) as such Underwriter may
reasonably request. The Prospectus and any amendments or supplements thereto
furnished to the Underwriters will be identical to the electronically
transmitted copies thereof filed with the Commission pursuant to EDGAR, except
to the extent permitted by Regulation S-T.

         (e)      Continued Compliance with Securities Laws. The Company will
comply with the 1933 Act and the 1933 Act Regulations, the 1934 Act and the 1934
Act Regulations so as to permit the completion of the distribution of the
Securities as contemplated in this Agreement and in the Prospectus. If at any
time when a prospectus is required by the 1933 Act to be delivered in connection
with sales of the Securities, any event shall occur or condition shall exist as
a result of which it is necessary, in the opinion of counsel for the
Underwriters or for the Company, to amend the Registration Statement or amend or
supplement the Prospectus in order that the Prospectus will not include any
untrue statements of a material fact or omit to state a material fact necessary
in order to make the statements therein not misleading in the light of the
circumstances existing at the time it is delivered to a purchaser, or if it
shall be necessary, in the opinion of such counsel, at any such time to amend
the Registration Statement or to file a new registration statement or amend or
supplement the Prospectus in order to comply with the requirements of the 1933
Act or the 1933 Act Regulations, the Company will promptly prepare and file with
the Commission, subject to Section 3(b), such amendment, supplement or new
registration statement as may be necessary to correct such statement or omission
or to comply with such requirements, the Company will use all commercially
reasonable efforts to have such amendment or new registration statement declared
effective as soon as practicable (if it is not an automatic shelf registration
statement with respect to the Securities) and the Company will furnish to the
Underwriters such number of copies of such amendment, supplement or new
registration statement as the Underwriters may reasonably request. If at any
time following issuance of an Issuer Free Writing Prospectus there occurred or
occurs an event or development as a result of which such Issuer Free Writing
Prospectus conflicted or would conflict with the information contained in the
Registration Statement (or any other registration statement relating to the
Securities) or the Statutory Prospectus or any preliminary prospectus or
included or would include an untrue statement of a material fact or omitted or
would omit to state a material fact necessary in order to make the statements
therein, in the light of the circumstances prevailing at that subsequent time,
not misleading, the Company will promptly notify the Representative and will
promptly amend or supplement, at its own expense, such Issuer Free Writing
Prospectus to eliminate or correct such conflict, untrue statement or omission.



                                       15


         (f)      Blue Sky Qualifications. The Company will use all commercially
reasonable efforts, in cooperation with the Underwriters, to qualify the
Securities for offering and sale under the applicable securities laws of such
states and other jurisdictions as the Representative may designate and to
maintain such qualifications in effect for a period of not less than one year
from the date hereof; provided, however, that the Company shall not be obligated
to file any general consent to service of process or to qualify as a foreign
corporation or as a dealer in securities in any jurisdiction in which it is not
so qualified or so subject itself to taxation in respect of doing business in
any jurisdiction in which it is not otherwise so subject; and provided further
that the Company's obligations pursuant to this subsection (f) to maintain
effective any qualifications shall cease upon the date that the Securities are
listed on the New York Stock Exchange (or any successor to such entity). The
Company will also supply the Underwriters with such information as is necessary
for the determination of the legality of the Securities for investment under the
laws of such jurisdictions as the Underwriters may request.

         (g)      Rule 158. The Company will timely file such reports pursuant
to the 1934 Act as are necessary in order to make generally available to its
securityholders as soon as practicable an earnings statement for the purposes
of, and to provide to the Underwriters the benefits contemplated by, the last
paragraph of Section 11(a) of the 1933 Act.

         (h)      Use of Proceeds. The Company will use the net proceeds
received by it from the sale of the Securities in the manner specified in the
Prospectus under "Use of Proceeds."

         (i)      Listing. The Company will use its best efforts to effect the
listing of the Securities on the New York Stock Exchange.

         (j)      Restriction on Sale of Securities. During a period of 90 days
from the date of the Prospectus, the Company will not, without the prior written
consent of Underwriters, (i) directly or indirectly, offer, pledge, sell,
contract to sell, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase or otherwise
transfer or dispose of any share of Common Stock or any securities convertible
into or exercisable or exchangeable for Common Stock or file any registration
statement under the 1933 Act with respect to any of the foregoing or (ii) enter
into any swap or any other agreement or any transaction that transfers, in whole
or in part, directly or indirectly, the economic consequence of ownership of the
Common Stock, whether any such swap or transaction described in clause (i) or
(ii) above is to be settled by delivery of Common Stock or such other
securities, in cash or otherwise. The foregoing sentence shall not apply to (A)
the Securities to be sold hereunder, (B) any shares of Common Stock issued by
the Company upon the exercise of an option or warrant or the conversion of a
security outstanding on the date hereof and referred to in the Prospectus, (C)
any shares of Common Stock issued or options to purchase Common Stock granted
pursuant to existing employee benefit plans or non-employee director stock plans
of the Company referred to in the Prospectus or any renewal or extension of such
plan as may be approved by the requisite holders of shares of the Company's
Common


                                       16


Stock, or (D) any shares of Common Stock issued pursuant to the common stock
investment plan.

                  Notwithstanding the foregoing, if (1) during the last 17 days
of the 90-day restricted period the Company issues an earnings release or
material news or a material event relating to the Company occurs or (2) prior to
the expiration of the 90-day restricted period, the Company announces that it
will release earnings results or becomes aware that material news or a material
event will occur during the 16-day period beginning on the last day of the
90-day restricted period, the restrictions imposed in this clause (j) shall
continue to apply until the expiration of the 18-day period beginning on the
issuance of the earnings release or the occurrence of the material news or
material event.

         (k)      Reporting Requirements. The Company, during the period when
the Prospectus is required to be delivered under the 1933 Act, will file all
documents required to be filed with the Commission pursuant to the 1934 Act
within the time periods required by the 1934 Act and the 1934 Act Regulations.

         (l)      Issuer Free Writing Prospectuses. The Company represents and
agrees that, unless it obtains the prior consent of the Representative, and each
Underwriter represents and agrees that, unless it obtains the prior consent of
the Company and the Representative, it has not made and will not make any offer
relating to the Securities that would constitute an "issuer free writing
prospectus," as defined in Rule 433, or that would otherwise constitute a "free
writing prospectus," as defined in Rule 405, required to be filed with the
Commission. Any such free writing prospectus consented to by the Company or the
Representative, as the case may be, is herein referred to as a "PERMITTED FREE
WRITING PROSPECTUS". The Company represents that it has treated or agrees that
it will treat each Permitted Free Writing Prospectus as an "issuer free writing
prospectus," as defined in Rule 433, and has complied and will comply with the
requirements of Rule 433 applicable to any Permitted Free Writing Prospectus,
including timely filing with the Commission where required, legending and record
keeping.

         SECTION 4. Payment of Expenses.

         (a)      Expenses. The Company will pay all expenses incident to the
performance of its obligations under this Agreement, including (i) the printing
and filing of the Registration Statement (including financial statements and
exhibits) as originally filed and of each amendment thereto, (ii) the printing
and delivery to the Underwriters of this Agreement and such other documents as
may be required in connection with the offering, purchase, sale, issuance or
delivery of the Securities, (iii) the printing, issuance and delivery of the
certificates for the Securities to the Underwriters, including any stock or
other transfer taxes and any stamp or other duties payable upon the sale,
issuance or delivery of the Securities to the Underwriters, (iv) the fees and
disbursements of the Company's counsel, accountants and other advisors, (v) the
qualification of the Securities under securities laws in accordance with the
provisions of Section 3(d) hereof, including filing fees and the reasonable fees
and disbursements of counsel for the Underwriters in connection therewith and in
connection with the preparation of the Blue Sky Survey, any



                                       17


supplement thereto, (vi) the printing and delivery to the Underwriters of copies
of each preliminary prospectus, any Permitted Free Writing Prospectus and of the
Prospectus and any amendments or supplements thereto and any costs associated
with electronic delivery of any of the foregoing by the Underwriters to
investors, (vii) the costs and expenses of the Company relating to investor
presentations on any "road show" undertaken in connection with the marketing of
the Securities including, without limitation, expenses associated with the
production of road show slides and graphics, fees and expenses of any
consultants engaged in connection with the road show presentations, all except
as otherwise agreed between the Company and the Representative, (viii) the fees
and expenses of any transfer agent or registrar for the Securities and (ix) the
fees and expenses incurred in connection with the listing of the Securities on
the New York Stock Exchange.

                  The Underwriters shall pay their own out-of-pocket expenses in
connection with the purchase, offer and sale by them of the Securities, and the
Representative, on behalf of the Underwriters, shall pay the fees and
disbursements of counsel for the Underwriters (except as provided in clause (v)
of the preceding paragraph).

         (b)      Termination of Agreement. If this Agreement is terminated by
the Representative in accordance with the provisions of Section 5 or Section
9(a)(i) hereof, the Company shall reimburse the Underwriters for all of their
reasonable out-of-pocket expenses, including the reasonable fees and
disbursements of counsel for the Underwriters.

         SECTION 5. Conditions of Underwriters' Obligations. The obligations of
the several Underwriters hereunder are subject to the accuracy, as of the time
of effectiveness of this Agreement and as of the Closing Time, of the
representations and warranties of the Company contained in Section 1 hereof or
in certificates of any officer of the Company or any of its subsidiaries
delivered pursuant to the provisions hereof, to the performance by the Company
of its covenants and other obligations hereunder, and to the following further
conditions:

                  (a)      Effectiveness of Registration Statement; Filing of
         Prospectus; Payment of Filing Fee. The Registration Statement shall be
         effective and at Closing Time no stop order suspending the
         effectiveness of the Registration Statement shall have been issued
         under the 1933 Act or proceedings therefor initiated or threatened by
         the Commission, and any request on the part of the Commission for
         additional information shall have been complied with to the reasonable
         satisfaction of counsel to the Underwriters. A prospectus containing
         the Rule 430B Information shall have been filed with the Commission in
         the manner and within the time period required by Rule 424(b) without
         reliance on Rule 424(b)(8) (or a post-effective amendment providing
         such information shall have been filed and become effective in
         accordance with the requirements of Rule 430B). The Company shall have
         paid the required Commission filing fees relating to the Securities
         within the time period required by Rule 456(b)(1)(i) of the 1933 Act
         Regulations without regard to the proviso therein and otherwise in



                                       18


         accordance with Rules 456(b) and 457(r) of the 1933 Act Regulations
         and, if applicable, shall have updated the "Calculation of Registration
         Fee" table in accordance with Rule 456(b)(1)(ii) either in a
         post-effective amendment to the Registration Statement or on the cover
         page of a prospectus filed pursuant to Rule 424(b).

                  (b)      Opinions of Counsel for Company. At the Closing Time,
         the Representative shall have received the favorable opinion, dated as
         of the Closing Time, of each of Woodburn and Wedge and Choate, Hall &
         Stewart LLP, counsel for the Company, in form and substance
         satisfactory to counsel for the Underwriters, together with signed or
         reproduced copies of such letter for each of the other Underwriters to
         the effect set forth in Exhibits A and B hereto, respectively, and to
         such further effect as counsel to the Underwriters may reasonably
         request.

                  (c)      Opinion of Counsel for Underwriters. At the Closing
         Time, the Representative shall have received the favorable opinion,
         dated as of the Closing Time, of Dewey Ballantine LLP, counsel for the
         Underwriters, together with signed or reproduced copies of such letter
         for each of the other Underwriters, with respect to such matters as the
         Representative shall reasonably request. In giving such opinion such
         counsel may rely, as to all matters governed by the laws of
         jurisdictions other than the law of the State of New York and the
         federal law of the United States, upon the opinions of counsel
         satisfactory to the Representative. Such counsel may also state that,
         insofar as such opinion involves factual matters, they have relied, to
         the extent they deem proper, upon certificates of officers of the
         Company and its subsidiaries and certificates of public officials.

                  (d)      Officers' Certificate. At the Closing Time, there
         shall not have been, since the time of effectiveness of this Agreement
         or since the respective dates as of which information is given in the
         Registration Statement, the Disclosure Package or the Prospectus, any
         Material Adverse Change, and the Representative shall have received a
         certificate of the President, any Vice President or the Treasurer of
         the Company and of the chief financial or chief accounting officer of
         the Company, dated as of the Closing Time, to the effect that (i) there
         has been no such Material Adverse Change, (ii) the representations and
         warranties in Section 1 hereof are true and correct with the same force
         and effect as though expressly made at and as of the Closing Time,
         (iii) the Company has complied with all agreements and satisfied all
         conditions on its part to be performed or satisfied at or prior to the
         Closing Time and (iv) no stop order suspending the effectiveness of the
         Registration Statement has been issued and no proceedings for that
         purpose have been instituted or are pending or, to their knowledge,
         contemplated by the Commission.

                  (e)      Accountants' Comfort Letter. At the time of the
         execution of this Agreement, the Representative shall have received
         from Deloitte & Touche LLP a letter dated such date, in form and
         substance satisfactory to the Representative, together with signed or
         reproduced copies of such letter for each of the other


                                       19


         Underwriters containing statements and information of the type
         ordinarily included in accountants' "comfort letters" to Underwriters
         with respect to the financial statements and other financial
         information contained in the Registration Statement and Prospectus.

                  (f)      Bring-down Comfort Letter. At the Closing Time, the
         Representative shall have received from Deloitte & Touche LLP a letter,
         dated as of the Closing Time, to the effect that they reaffirm the
         statements made in the letter furnished pursuant to subsection (e) of
         this Section, except that the "specified date" referred to shall be a
         date not more than three business days prior to the Closing Time.

                  (g)      Approval of Listing. At Closing Time, the Securities
         shall have been approved for listing on the New York Stock Exchange,
         subject only to official notice of issuance.

                  (h)      Maintenance of Ratings. Since the date of this
         Agreement, there shall not have occurred a downgrading in the rating
         assigned to any of the debt securities of the Company or any of its
         Significant Subsidiaries by any "nationally recognized statistical
         rating agency", as that term is defined by the Commission for purposes
         of Rule 436(g)(2) under the 1933 Act and no such securities rating
         agency shall have publicly announced that it has under credit watch,
         surveillance or review, with possible negative implications, its rating
         of any of such securities.

                  (i)      Lock-up Agreements. At the Closing Time, the
         Representative shall have received an agreement substantially in the
         form of Exhibit C hereto signed by the persons listed on Schedule C
         hereto.

                  (j)      Conditions to Purchase of Option Securities. In the
         event that the Underwriters exercise their option provided in Section
         2(b) hereof to purchase all or any portion of the Option Securities,
         the representations and warranties of the Company contained herein and
         the statements in any certificates furnished by the Company, any
         subsidiary of the Company hereunder shall be true and correct as of
         each Date of Delivery and, at the relevant Date of Delivery, the
         Representative shall have received:

                           (i)      Officers' Certificate. A certificate, dated
                  such Date of Delivery, of the President, any Vice President or
                  the Treasurer of the Company and of the chief financial or
                  chief accounting officer of the Company confirming that the
                  certificate delivered at the Closing Time pursuant to Section
                  5(d) hereof remains true and correct as of such Date of
                  Delivery.

                           (ii)     Opinion of Counsel for Company. The
                  favorable opinion of each of Woodburn and Wedge and Choate,
                  Hall & Stewart LLP, counsel for the Company, in form and
                  substance satisfactory to counsel for the Underwriters, dated
                  such Date of Delivery, relating to the Option


                                       20


                  Securities to be purchased on such Date of Delivery and
                  otherwise to the same effect as the opinion required by
                  Section 5(b) hereof.

                           (iii)    Opinion of Counsel for Underwriters. The
                  favorable opinion of Dewey Ballantine LLP, counsel for the
                  Underwriters, dated such Date of Delivery, relating to the
                  Option Securities to be purchased on such Date of Delivery and
                  otherwise to the same effect as the opinion required by
                  Section 5(c) hereof.

                           (iv)     Bring-down Comfort Letter. A letter from
                  Deloitte & Touche LLP, in form and substance satisfactory to
                  the Representative and dated such Date of Delivery,
                  substantially in the same form and substance as the letter
                  furnished to the Representative pursuant to Section 5(f)
                  hereof, except that the "specified date" in the letter
                  furnished pursuant to this paragraph shall be a date not more
                  than five days prior to such Date of Delivery.

                  (k)      Additional Documents. At Closing Time and at each
         Date of Delivery, counsel for the Underwriters shall have been
         furnished with such additional documents and opinions as they may
         require for the purpose of enabling them to pass upon the issuance and
         sale of the Securities as herein contemplated, or in order to evidence
         the accuracy of any of the representations or warranties, or the
         fulfillment of any of the conditions, herein contained; and all
         proceedings taken by the Company in connection with the issuance and
         sale of the Securities as herein contemplated shall be satisfactory in
         form and substance to the Representative and counsel for the
         Underwriters.

                  (l)      Termination of Agreement. If any condition specified
         in this Section shall not have been fulfilled when and as required to
         be fulfilled, this Agreement or, in the case of any condition to the
         purchase of Option Securities on a Date of Delivery which is after the
         Closing Time, the obligations of the several Underwriters to purchase
         the relevant Option Securities, may be terminated by the Representative
         by notice to the Company at any time at or prior to Closing Time or
         such Date of Delivery, as the case may be, and such termination shall
         be without liability of any party to any other party except as provided
         in Section 4 and except that Sections 1, 6, 7 and 8 shall survive any
         such termination and remain in full force and effect.

         SECTION 6. Indemnification.

         (a)      Indemnification of Underwriters. The Company agrees to
indemnify and hold harmless each Underwriter, its affiliates as such term is
defined in Rule 501(b) under the 1933 Act (each, an "AFFILIATE"), its selling
agents and each person, if any, who controls any Underwriter within the meaning
of Section 15 of the 1933 Act or Section 20 of the 1934 Act as follows:



                                       21


                  (i)      against any and all loss, liability, claim, damage
         and expense whatsoever, as incurred, arising out of any untrue
         statement or alleged untrue statement of a material fact contained in
         the Registration Statement (or any amendment or supplement thereto),
         including the Rule 430B Information, or the omission or alleged
         omission therefrom of a material fact required to be stated therein or
         necessary in order to make the statements therein, in the light of the
         circumstances under which they were made, not misleading or arising out
         of any untrue statement or alleged untrue statement of a material fact
         contained in any preliminary prospectus, any Issuer Free Writing
         Prospectus or the Prospectus (or any amendment or supplement thereto),
         or the omission or alleged omission therefrom of a material fact
         necessary in order to make the statements therein, in the light of the
         circumstances under which they were made, not misleading;

                  (ii)     against any and all loss, liability, claim, damage
         and expense whatsoever, as incurred, to the extent of the aggregate
         amount paid in settlement of any litigation, or any investigation or
         proceeding by any governmental agency or body, commenced or threatened,
         or of any claim whatsoever based upon any such untrue statement or
         omission, or any such alleged untrue statement or omission; provided
         that (subject to Section 6(d) below) any such settlement is effected
         with the written consent of the Company; and

                  (iii)    against any and all expense whatsoever, as incurred
         (including the fees and disbursements of counsel chosen by the
         Representative), reasonably incurred in investigating, preparing or
         defending against any litigation, or any investigation or proceeding by
         any governmental agency or body, commenced or threatened, or any claim
         whatsoever based upon any such untrue statement or omission, or any
         such alleged untrue statement or omission, to the extent that any such
         expense is not paid under (i) or (ii) above;

provided, however, that this indemnity agreement shall not apply to any loss,
liability, claim, damage or expense to the extent arising out of any untrue
statement or omission or alleged untrue statement or omission made in reliance
upon and in conformity with written information furnished to the Company by any
Underwriter through the Representative expressly for use in the Registration
Statement (or any amendment thereto), including the Rule 430B Information, or
any preliminary prospectus, any Issuer Free Writing Prospectus or the Prospectus
(or any amendment or supplement thereto).

         (b)      Indemnification of Company, Directors and Officers. Each
Underwriter severally agrees to indemnify and hold harmless the Company, its
directors, officers and each person, if any, who controls the Company within the
meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act against any
and all loss, liability, claim, damage and expense described in the indemnity
contained in subsection (a) of this Section, as incurred, but only with respect
to untrue statements or omissions, or alleged untrue statements or omissions,
made in the Registration Statement (or any amendment thereto), including the
Rule 430B Information or any preliminary prospectus, any Issuer Free Writing
Prospectus or the Prospectus (or any amendment or supplement thereto) in



                                       22


reliance upon and in conformity with written information furnished to the
Company by such Underwriter through the Representative expressly for use
therein.

         (c)      Actions against Parties; Notification. Each indemnified party
shall give notice as promptly as reasonably practicable to each indemnifying
party of any action commenced against it in respect of which indemnity may be
sought hereunder, but failure to so notify an indemnifying party shall not
relieve such indemnifying party from any liability hereunder to the extent it is
not materially prejudiced as a result thereof and in any event shall not relieve
it from any liability which it may have otherwise than on account of this
indemnity agreement. In the case of parties indemnified pursuant to Section 6(a)
above, counsel to the indemnified parties shall be selected by the
Representative, and, in the case of parties indemnified pursuant to Section 6(b)
above, counsel to the indemnified parties shall be selected by the Company. An
indemnifying party may participate at its own expense in the defense of any such
action; provided, however, that counsel to the indemnifying party shall not
(except with the consent of the indemnified party) also be counsel to the
indemnified party. In no event shall the indemnifying parties be liable for fees
and expenses of more than one counsel (in addition to any local counsel)
separate from their own counsel for all indemnified parties in connection with
any one action or separate but similar or related actions in the same
jurisdiction arising out of the same general allegations or circumstances. No
indemnifying party shall, without the prior written consent of the indemnified
parties, settle or compromise or consent to the entry of any judgment with
respect to any litigation, or any investigation or proceeding by any
governmental agency or body, commenced or threatened, or any claim whatsoever in
respect of which indemnification or contribution could be sought under this
Section or Section 7 hereof (whether or not the indemnified parties are actual
or potential parties thereto), unless such settlement, compromise or consent (i)
includes an unconditional release of each indemnified party from all liability
arising out of such litigation, investigation, proceeding or claim and (ii) does
not include a statement as to or an admission of fault, culpability or a failure
to act by or on behalf of any indemnified party.

         (d)      Settlement without Consent if Failure to Reimburse. If at any
time an indemnified party shall have requested an indemnifying party to
reimburse the indemnified party for fees and expenses of counsel, such
indemnifying party agrees that it shall be liable for any settlement of the
nature contemplated by Section 6(a)(ii) effected without its written consent if
(i) such settlement is entered into more than 45 days after receipt by such
indemnifying party of the aforesaid request, (ii) such indemnifying party shall
have received notice of the terms of such settlement at least 30 days prior to
such settlement being entered into and (iii) such indemnifying party shall not
have reimbursed such indemnified party in accordance with such request prior to
the date of such settlement.

         SECTION 7. Contribution. If the indemnification provided for in Section
6 hereof is for any reason unavailable to or insufficient to hold harmless an
indemnified party in respect of any losses, liabilities, claims, damages or
expenses referred to therein, then each indemnifying party shall contribute to
the aggregate amount of such losses, liabilities, claims, damages and expenses
incurred by such indemnified party, as incurred,



                                       23


(i) in such proportion as is appropriate to reflect the relative benefits
received by the Company on the one hand and the Underwriters on the other hand
from the offering of the Securities pursuant to this Agreement or (ii) if the
allocation provided by clause (i) is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative benefits referred
to in clause (i) above but also the relative fault of the Company on the one
hand and of the Underwriters on the other hand in connection with the statements
or omissions which resulted in such losses, liabilities, claims, damages or
expenses, as well as any other relevant equitable considerations.

                  The relative benefits received by the Company on the one hand
and the Underwriters on the other hand in connection with the offering of the
Securities pursuant to this Agreement shall be deemed to be in the same
respective proportions as the total net proceeds from the offering of the
Securities pursuant to this Agreement (before deducting expenses) received by
the Company and the total underwriting discount received by the Underwriters,
bear to the aggregate initial offering price of the Securities.

                  The relative fault of the Company on the one hand and the
Underwriters on the other hand shall be determined by reference to, among other
things, whether any such untrue or alleged untrue statement of a material fact
or omission or alleged omission to state a material fact relates to information
supplied by the Company or by the Underwriters and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission.

                  The Company and the Underwriters agree that it would not be
just and equitable if contribution pursuant to this Section were determined by
pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this Section. The aggregate
amount of losses, liabilities, claims, damages and expenses incurred by an
indemnified party and referred to above in this Section shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in investigating, preparing or defending against any litigation, or any
investigation or proceeding by any governmental agency or body, commenced or
threatened, or any claim whatsoever based upon any such untrue or alleged untrue
statement or omission or alleged omission.

                  Notwithstanding the provisions of this Section, no Underwriter
shall be required to contribute any amount in excess of the amount by which the
total price at which the Securities purchased and sold by it hereunder exceeds
the amount of any damages which such Underwriter has otherwise been required to
pay by reason of such untrue or alleged untrue statement or omission or alleged
omission.

                  No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation.

                  For purposes of this Section, each person, if any, who
controls an Underwriter within the meaning of Section 15 of the 1933 Act or
Section 20 of the 1934


                                       24


Act and each Underwriter's Affiliates and selling agents shall have the same
rights to contribution as such Underwriter, and each person, if any, who
controls the Company within the meaning of Section 15 of the 1933 Act or Section
20 of the 1934 Act shall have the same rights to contribution as the Company.
The Underwriters' respective obligations to contribute pursuant to this Section
7 are several in proportion to the number of Initial Securities set forth
opposite their respective names in Schedule A hereto and not joint.

         SECTION 8. Representations, Warranties and Agreements to Survive
Delivery. All representations, warranties and agreements contained in this
Agreement or in certificates of officers of the Company or any of its
subsidiaries submitted pursuant hereto shall remain operative and in full force
and effect, regardless of any investigation made by or on behalf of any
Underwriter or its Affiliates or selling agents or controlling person, or by or
on behalf of the Company, and shall survive delivery of the Securities to the
Underwriters.

         SECTION 9. Termination of Agreement.

         (a)      Termination; General. The Representative may terminate this
Agreement, by notice to the Company, at any time at or prior to Closing Time (i)
if there has been, since the time of execution of this Agreement or since the
respective dates as of which information is given in the Prospectus or General
Disclosure Package, any Material Adverse Change, or (ii) if there has occurred
any material adverse change in the financial markets in the United States or in
the international financial markets, any outbreak of hostilities or escalation
thereof or other calamity or crisis or any change or development involving a
prospective change in national or international political, financial or economic
conditions, in each case the effect of which is such as to make it, in the
judgment of the Representative, impracticable or inadvisable to market the
Securities or to enforce contracts for the sale of the Securities, (iii) if
trading in any securities of the Company or any of its subsidiaries has been
suspended or materially limited by the Commission or the New York Stock
Exchange, or if trading generally on the American Stock Exchange, the New York
Stock Exchange or the NASDAQ Stock Market has been suspended or materially
limited, or minimum or maximum prices for trading have been fixed, or maximum
ranges for prices have been required, by any of said exchanges or by such system
or by order of the Commission, the National Association of Securities Dealers,
Inc. or any other governmental authority, or a material disruption has occurred
in commercial banking or securities settlement or clearance services in the
United States or with respect to Clearstream or Euroclear systems in Europe, or
(iv) if a banking moratorium has been declared by either Federal or New York
authorities.

         (b)      Liabilities. If this Agreement is terminated pursuant to this
Section, such termination shall be without liability of any party to any other
party except as provided in Section 4 hereof, and provided further that Sections
1, 6, 7 and 8 shall survive such termination and remain in full force and
effect.

         SECTION 10. Default by One or More of the Underwriters. If one or more
of the Underwriters shall fail at the Closing Time or a Date of Delivery to
purchase the



                                       25


Securities which it or they are obligated to purchase under this Agreement (the
"DEFAULTED SECURITIES"), the Representative shall have the right, within 24
hours thereafter, to make arrangements for one or more of the non-defaulting
Underwriters, or any other underwriters, to purchase all, but not less than all,
of the Defaulted Securities in such amounts as may be agreed upon and upon the
terms herein set forth; if, however, the Representative shall not have completed
such arrangements within such 24-hour period, then:

                  (a)      if the principal amount of Defaulted Securities does
         not exceed 10% of the number of Securities to be purchased hereunder,
         each of the non-defaulting Underwriters shall be obligated, severally
         and not jointly, to purchase the full amount thereof in the proportions
         that their respective underwriting obligations hereunder bear to the
         underwriting obligations of all non-defaulting Underwriters, or

                  (b)      if the principal amount of Defaulted Securities
         exceeds 10% of the aggregate principal amount of the Securities to be
         purchased hereunder, this Agreement shall terminate without liability
         on the part of any non-defaulting Underwriter.

                  No action taken pursuant to this Section shall relieve any
defaulting Underwriter from liability in respect of its default.

                  In the event of any such default which does not result in a
termination of this Agreement or, in the case of a Date of Delivery which is
after the Closing Time, which does not result in a termination of the obligation
of the Underwriters to purchase and the Company to sell the relevant Option
Securities, as the case may be, either the Representative or the Company shall
have the right to postpone the Closing Time or the relevant Date of Delivery, as
the case may be, for a period not exceeding seven days in order to effect any
required changes in the Registration Statement or Prospectus or in any other
documents or arrangements. As used herein, the term "Underwriter" includes any
person substituted for an Underwriter under this Section.

         SECTION 11. Notices. All notices and other communications hereunder
shall be in writing and shall be deemed to have been duly given if mailed or
transmitted by any standard form of telecommunication. Notices to the
Underwriters shall be directed to the Representative at John Farry, 60 Wall
Street, New York, New York 10005; notices to the Company shall be directed to it
at Sierra Pacific Resources, P.O. Box 10100 (6100 Neil Road), Reno, Nevada
89520, attention of the Corporate Treasurer.

         SECTION 12. No Advisory or Fiduciary Relationship. The Company
acknowledges and agrees that (a) the purchase and sale of the Securities
pursuant to this Agreement, including the determination of the public offering
price of the Securities and any related discounts and commissions, is an
arm's-length commercial transaction between the Company, on the one hand, and
the several Underwriters, on the other hand, (b) in connection with the offering
contemplated hereby and the process leading to such transaction each Underwriter
is and has been acting solely as a principal and is not the



                                       26


agent or fiduciary of the Company, or its stockholders, creditors, employees or
any other party, (c) no Underwriter has assumed or will assume an advisory or
fiduciary responsibility in favor of the Company with respect to the offering
contemplated hereby or the process leading thereto (irrespective of whether such
Underwriter has advised or is currently advising the Company on other matters)
and no Underwriter has any obligation to the Company with respect to the
offering contemplated hereby except the obligations expressly set forth in this
Agreement, (d) the Underwriters and their respective affiliates may be engaged
in a broad range of transactions that involve interests that differ from those
of the Company, and (e) the Underwriters have not provided any legal,
accounting, regulatory or tax advice with respect to the offering contemplated
hereby and the Company has consulted its own legal, accounting, regulatory and
tax advisors to the extent it deemed appropriate. Nothing in this Section 12 is
intended to limit any duties of confidentiality that the Underwriters might
otherwise have as investment bankers.

         SECTION 13. Parties. This Agreement shall inure to the benefit of and
be binding upon the Underwriters and the Company and their respective
successors. Nothing expressed or mentioned in this Agreement is intended or
shall be construed to give any person, firm or corporation, other than the
Underwriters and the Company and their respective successors and the controlling
persons and officers and directors referred to in Sections 6 and 7 and their
heirs and legal representatives, any legal or equitable right, remedy or claim
under or in respect of this Agreement or any provision herein contained. This
Agreement and all conditions and provisions hereof are intended to be for the
sole and exclusive benefit of the Underwriters and the Company and their
respective successors, and said controlling persons and officers and directors
and their heirs and legal representatives, and for the benefit of no other
person, firm or corporation. No purchaser of Securities from any Underwriter
shall be deemed to be a successor by reason merely of such purchase.

         SECTION 14. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

         SECTION 15. WAIVER OF TRIAL BY JURY. THE UNDERWRITERS AND THE COMPANY
EACH WAIVE ANY RIGHT TO TRIAL BY JURY IN ANY ACTION, CLAIM, SUIT OR PROCEEDING
ARISING OUT OF THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

         SECTION 16. TIME. TIME SHALL BE OF THE ESSENCE OF THIS AGREEMENT.
EXCEPT AS OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK
CITY TIME.

         SECTION 17. Counterparts. This Agreement may be executed in any number
of counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

         SECTION 18. Effect of Headings. The Section headings and Table of
Contents herein are for convenience only and shall not affect the construction
hereof.

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


                                       27




                  If the foregoing is in accordance with your understanding of
our agreement, please sign and return to the Company a counterpart hereof,
whereupon this instrument, along with all counterparts, will become a binding
agreement between the Underwriters and the Company in accordance with its terms.

                                            Very truly yours,



                                            SIERRA PACIFIC RESOURCES



                                            By:
                                                 -------------------------------
                                                 Name:
                                                 Title:


CONFIRMED AND ACCEPTED,
  as of the date first above written:

DEUTSCHE BANK SECURITIES INC.



By:
    ---------------------------------------
    Name:
    Title:



By:
    ---------------------------------------
    Name:
    Title:


                  For itself and as Representative of the other Underwriters
named in Schedule A hereto.



                                       28







                                   SCHEDULE A




                                                                 Number of
               Name of Underwriters                         Initial Securities
               --------------------                         ------------------


                                                             
Deutsche Bank Securities Inc...............................     20,000,000
                                                                ----------
Total......................................................     20,000,000
                                                                ==========






                                     Sch A-1






                                   SCHEDULE B

                            SIERRA PACIFIC RESOURCES

                        20,000,000 Shares of Common Stock
                           (Par Value $1.00 Per Share)

                  1.       The purchase price per share for the Securities to be
paid by the several Underwriters shall be $14.03; provided that the purchase
price per share for any Option Securities purchased upon the exercise of the
over-allotment option described in Section 2(b) shall be reduced by an amount
per share equal to any dividends or distributions declared by the Company and
payable on the Initial Securities but not payable on the Option Securities.

                  2.       (i)      The Company will receive total proceeds of
$280,600,000, without deducting estimated expenses of the offering and without
the exercise of the Underwriters' over-allotment option.

                           (ii)     The net proceeds of the offering, after
deducting estimated expenses payable by the Company, will be approximately
$280,400,000, without the exercise of the Underwriters' over-allotment option,
and $322,490,000 if the Underwriters' over-allotment option is exercised in
full.

                  3.       The Underwriter and its affiliates have provided
investment banking, commercial banking and financial advisory services for the
Company and its subsidiaries from time to time for which they have received
customary fees and reimbursements of expenses and may in the future provide
additional services. The Underwriter is a lender under the Revolving Credit
Facilities of both Nevada Power Company and Sierra Pacific Power Company. The
Underwriter was an initial purchaser of Nevada Power Company's 6.650% General
and Refunding Mortgage Notes, Series N, due 2036 and Nevada Power Company's
6.50% General and Refunding Mortgage Notes, Series O, due 2018. Deutsche Bank
Trust Company Americas, an affiliate of the Underwriter, serves as trustee under
Nevada Power Company's First Mortgage Indenture. The Underwriter acted as a
Dealer Manager in connection with the conversion offer of the Company's 7.25%
Convertible Notes due 2010, launched August 3, 2005.




                                     Sch B-1





                                   SCHEDULE C

                                 List of persons
                               subject to lock-up



Name                           Title
- ----                           -----

                            
Walter M. Higgins              President and Chief Executive Officer

Michael W. Yackira             Corporate Executive Vice President and Chief
                               Financial Officer

Donald L. Shalmy               Corporate Senior Vice President, Policy and
                               External Affairs

Jeffrey L. Ceccarelli          Corporate Senior Vice President, Service Delivery
                               and Operations

Paul L. Kaleta                 Corporate Senior Vice President, General Counsel
                               and Corporate Secretary

Roberto R. Denis               Corporate Senior Vice President, Generation and
                               Energy Supply, SPR

Stephen R. Wood                Corporate Senior Vice President, Administration

John E. Brown                  Controller

William D. Rogers              Corporate Treasurer



                                     Sch C-1






                                   SCHEDULE D

            List of all Issuer General Use Free Writing Prospectuses

None




                                     Sch D-1




                                                                       EXHIBIT A

                    CONTENTS OF OPINION OF WOODBURN AND WEDGE
                           TO BE DELIVERED PURSUANT TO
                                  SECTION 5(b)

    (Certain capitalized terms not defined in this exhibit are defined in the
                              Purchase Agreement.)

                  (1) The Company has been duly organized and is validly
existing as a corporation in good standing under the laws of the State of Nevada
and has corporate power and authority to own, lease and operate its properties
and to conduct its business as described in the Prospectus and to enter into and
perform its obligations under the Purchase Agreement.

                  (2) Each Significant Subsidiary of the Company has been duly
organized and is validly existing as a corporation in good standing under the
laws of the State of Nevada, has corporate power and authority to own, lease and
operate its properties and to conduct its business as described in the
Prospectus. The shares of issued and outstanding capital stock of each
Significant Subsidiary have been duly authorized and validly issued and are
fully paid and non-assessable; none of the issued and outstanding shares of
capital stock of any Significant Subsidiary was issued in violation of any
preemptive or other similar rights of any securityholder of such Significant
Subsidiary.

                  (3) The Purchase Agreement has been duly authorized, executed
and delivered by the Company.

                  (4) The Company has 350,000,000 shares of Common Stock
authorized under its charter; the shares of issued and currently outstanding
Common Stock of the Company (excluding shares issued pursuant to reservations,
agreements, or employee benefit plans, non-employee director plans or the common
stock investment plans) have been duly authorized and validly issued and are
fully paid and non-assessable; and none of the outstanding shares of Common
Stock of the Company was issued in violation of preemptive or other similar
rights of any securityholder of the Company.

                  (5) The Securities to be purchased by the Underwriters from
the Company have been duly authorized for issuance and sale to the Underwriters
pursuant to the Purchase Agreement and, when issued and delivered by the Company
pursuant to the Purchase Agreement against payment of the consideration set
forth in the Purchase Agreement, will be validly issued and fully paid and
non-assessable and, except with respect to applicable law which allows the
separate identity of a corporation to be disregarded in certain extraordinary
circumstances, no holder of the Securities is or will be subject to personal
liability by reason of being such a holder.



                                       A-1






                  (6) No filing with, or authorization, approval, consent,
license, order, registration, qualification or decree of, any Nevada court or
Nevada governmental authority or agency, domestic or foreign (other than as may
be required under securities or blue sky laws, as to which we express no
opinion) is necessary or required in connection with the due authorization,
execution and delivery of the Purchase Agreement or for the offering, issuance,
sale or delivery of the Securities.

                  (7) The execution, delivery and performance of the Purchase
Agreement and the consummation of the transactions contemplated in the Purchase
Agreement and in the Registration Statement (including the issuance and sale of
the Securities and the use of the proceeds from the sale of the Securities as
described in the Prospectus under the caption "Use Of Proceeds") and compliance
by the Company with its obligations under the Purchase Agreement do not and will
not, whether with or without the giving of notice or lapse of time or both
result in any violation of the provisions of the charter or by-laws of the
Company or any Significant Subsidiary, or any applicable Nevada law, statute,
rule, regulation, judgment, order, writ or decree, known to us, of any Nevada
government instrumentality or Nevada court having jurisdiction over the Company
or any Significant Subsidiary or any of their respective properties, assets or
operations.

                  (8) The information in the Prospectus under the heading
"Description of Common Stock", to the extent that it constitutes matters of
Nevada law, has been reviewed by us and is correct in all material respects.

                  Woodburn and Wedge may state that the legal opinions set forth
above are limited to the law of the State of Nevada. Woodburn and Wedge will
permit Choate, Hall & Stewart LLP and Dewey Ballantine LLP to rely upon their
opinion as to matters governed by or relating to Nevada law.





                                       2




                                                                       EXHIBIT B


                CONTENTS OF OPINION OF CHOATE HALL & STEWART LLP
                           TO BE DELIVERED PURSUANT TO
                                  SECTION 5(b)

   (Certain capitalized terms not defined in this exhibit are defined in the
                              Purchase Agreement.)

                  (1) The Company has been duly organized and is validly
existing as a corporation in good standing under the laws of the State of Nevada
and has corporate power and authority to own, lease and operate its properties
and to conduct its business as described in the Prospectus and to enter into and
perform its obligations under the Purchase Agreement; and the Company is duly
qualified as a foreign corporation to transact business and is in good standing
in each other jurisdiction in which such qualification is required, whether by
reason of the ownership or leasing of property or the conduct of business,
except where the failure so to qualify or to be in good standing would not have
a Material Adverse Effect.

                  (2) Each Significant Subsidiary of the Company has been duly
organized and is validly existing as a corporation in good standing under the
laws of the State of Nevada, has corporate power and authority to own, lease and
operate its properties and to conduct its business as described in the
Prospectus; and each Significant Subsidiary is duly qualified as a foreign
corporation to transact business and is in good standing in each jurisdiction in
which such qualification is required, whether by reason of the ownership or
leasing of property or the conduct of business, except where the failure so to
qualify or to be in good standing would not result in a Material Adverse Effect.
The shares of issued and outstanding capital stock of each Significant
Subsidiary have been duly authorized and validly issued and are fully paid and
non-assessable; none of the issued and outstanding shares of capital stock of
any Significant Subsidiary was issued in violation of any preemptive or other
similar rights of any securityholder of such Significant Subsidiary; and all
shares of capital stock of each Significant Subsidiary are owned by the Company,
free and clear of any security interests and other liens and encumbrances and of
any equities, claims and other adverse interests.

                  (3) The Purchase Agreement has been duly authorized, executed
and delivered by the Company.

                  (4) The Company has 350,000,000 shares of Common Stock
authorized under its charter; the shares of issued and currently outstanding
Common Stock of the Company (excluding shares issued pursuant to reservations,
agreements, or employee benefit plans, non-employee director plans or the common
stock investment plans) have been duly authorized and validly issued and are
fully paid and non-assessable; and none of the outstanding shares of Common
Stock of the Company was



                                      B-1


issued in violation of the preemptive or other similar rights of any
securityholder of the Company.

                  (5) The Securities to be purchased by the Underwriters from
the Company have been duly authorized for issuance and sale to the Underwriters
pursuant to the Purchase Agreement and, when issued and delivered by the Company
pursuant to the Purchase Agreement against payment of the consideration set
forth in the Underwriting Agreement, will be duly and validly issued and fully
paid and non-assessable and no holder of the Securities is or will be subject to
personal liability by reason of being such a holder. There are no pre-emptive or
other rights to subscribe for or to purchase, nor is there any restriction on
the voting or transfer of, the Securities pursuant to the Company's articles of
incorporation or by-laws or any agreement or instrument, except to the extent
described in the Registration Statement, the Disclosure Package and the
Prospectus.

                  (6) No filing with, or authorization, approval, consent,
license, order, registration, qualification or decree of, any court or
governmental authority or agency, domestic or foreign (other than under the 1933
Act and the 1933 Act Regulations, which have been obtained, or as may be
required under the securities or blue sky laws of the various states, as to
which we express no opinion) is necessary or required in connection with the due
authorization, execution and delivery of the Purchase Agreement or for the
offering, issuance, sale or delivery of the Securities.

                  (7) The execution, delivery and performance by the Company of
the Purchase Agreement, the participation by the Company in the transactions
contemplated in the Purchase Agreement and in the Registration Statement
(including the offering, sale, issuance and delivery of the Securities and the
use of proceeds from the sale of the Securities as described in the Prospectus
under the caption "Use of Proceeds"), and the performance by the Company of its
obligations under the Purchase Agreement, do not and will not, whether with or
without the giving of notice or lapse of time or both, conflict with or
constitute a breach of, or default or Repayment Event under or result in the
creation or imposition of any lien, charge or encumbrance upon any property or
assets of the Company or any Significant Subsidiary thereof pursuant to any
contract, indenture, mortgage, deed of trust, loan or credit agreement, note,
lease or any other agreement or instrument, known to us, to which the Company or
any of its Significant Subsidiaries is a party or by which it or any of them may
be bound, or to which any of the property or assets of the Company or any
Significant Subsidiary thereof is subject (except for such conflicts, breaches
or defaults or liens, charges or encumbrances that would, singly or in the
aggregate, not have a Material Adverse Effect), nor will such action result in
any violation of the provisions of the charter or by laws of the Company or the
charter or by-laws of any of its Significant Subsidiaries, or any applicable
law, statute, rule, regulation, judgment, order, writ or decree known to us of
any government, government instrumentality or court, domestic or foreign, having
jurisdiction over the Company or any of its Significant Subsidiaries or any of
their respective properties, assets or operations.



                                      B-2


                  (8) The Company is not an "investment company" or an entity
"controlled" by an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended.

                  (9) The Registration Statement, including, without limitation,
the Rule 430B Information, the Prospectus, excluding the documents incorporated
by reference therein, and each amendment or supplement to the Registration
Statement and the Prospectus, excluding the documents incorporated by reference
therein, as of their respective effective or issue dates (including without
limitation each deemed effective date with respect to the Underwriters pursuant
to Rule 430B(f)(2) of the 1933 Act Regulations), other than the financial
statements and supporting schedules included therein or omitted therefrom as to
which we need express no opinion, complied as to form in all material respects
with the requirements of the 1933 Act and the 1933 Act Regulations.

                  (10) The Registration Statement has become effective under the
1933 Act; any required filing of each prospectus relating to the Securities
(including the Prospectus) pursuant to Rule 424(b) has been made in the manner
and within the time period required by Rule 424(b) (without reference to Rule
424(b)(8)); any required filing of each issuer Free Writing Prospectus pursuant
to Rule 433 has been made in the manner and within the time period required by
Rule 433(d); and, to the best of our knowledge, no stop order suspending the
effectiveness of the Registration Statement has been issue under the 1933 Act
and no proceedings for the purpose have been instituted or are pending or
threatened by the Commission.

                  (11) The documents incorporated by reference in the Prospectus
(other than the financial statements and supporting schedules included therein
or omitted therefrom, as to which we need express no opinion), when they were
filed with the Commission complied as to form in all material respects with the
requirements of the 1934 Act and the rules and regulations of the Commission
thereunder.

                  (12) The form of certificate used to evidence the Securities
complies in all material respects with all applicable statutory requirements,
with any applicable requirements of the charter and by-laws of the Company and
the requirements of the New York Stock Exchange.

                  (13) All descriptions in the Registration Statement of
contracts and other documents to which the Company or its subsidiaries are a
party are accurate in all material respects.

                  (14) The information in the Prospectus under "Dividends from
Subsidiaries", "Sierra Pacific Resources" and "Description of Common Stock" and
in the Registration Statement under Item 15, to the extent that it constitutes
matters of law, summaries of legal matters, the Company's charter and bylaws or
legal proceedings, or legal conclusions, has been reviewed by us and is correct
in all material respects.

                  In addition, such counsel will state that:



                                      B-3


                  (a) To our knowledge, except as disclosed in the Registration
         Statement, there is no pending action, suit or proceeding before any
         court or government agency involving the Company or any subsidiary
         that, if determined adversely to the Company, might reasonably be
         expected to result in a Material Adverse Effect, or which might
         reasonably be expected to materially and adversely affect the
         consummation of the transactions contemplated in the Purchase Agreement
         or the performance by the Company of its obligations thereunder or the
         transactions contemplated by the Prospectus; and no such actions,
         suits, or proceedings are, to our knowledge or threatened, except as
         set forth in the Registration Statement.

                  (b) To the best of our knowledge, there are no franchises,
         contracts, indentures, mortgages, loan agreements, notes, leases or
         other instruments required to be described or referred to in the
         Registration Statement or to be filed as exhibits to the Registration
         Statement other than those described or referred to therein or filed or
         incorporated by reference as exhibits thereto.

                  (c) Nothing has come to our that would lead us to believe
         that:

                  (i) the Original Registration Statement or any amendment
         thereto (except for financial statements and schedules and other
         financial data included or incorporated by reference therein or omitted
         therefrom and the Form T-1, as to which we make no statement), at the
         time such Original Registration Statement or any such amendment became
         effective, contained an untrue statement of a material fact or omitted
         to state a material fact required to be stated therein or necessary to
         make the statements therein not misleading;

                  (ii) the Registration Statement, including the Rule 430B
         Information (except for financial statements and schedules and other
         financial data included or incorporated by reference therein or omitted
         therefrom and the Form T-1, as to which we make no statement), at each
         deemed effective date with respect to the Underwriters pursuant to Rule
         430B(f)(2) of the 1933 Act Regulations, contained an untrue statement
         of a material fact or omitted to state a material fact required to be
         stated therein or necessary to make the statements therein not
         misleading;

                  (iii) the Disclosure Package (except for financial statements
         and schedules and other financial data included or incorporated by
         reference therein or omitted therefrom, as to which we need make no
         statement), as of the Applicable Time, contained any untrue statement
         of a material fact or omitted to state any material fact necessary in
         order to make the statements therein, in the light of circumstances
         under which they were made, not misleading; or

                  (iv) the Prospectus (except for financial statements and
         schedules and other financial data included or incorporated by
         reference therein or omitted therefrom, as to which we make no
         statement), at the time the Prospectus was issued or at the Closing
         Time, included or includes an untrue statement of a material fact or
         omitted or omits to state a material fact necessary in order to



                                      B-4


         make the statements therein, in the light of the circumstances under
         which they were made, not misleading;

it being understood, however, that we express no such belief with respect to the
financial statements, including the notes and schedules thereto, or any other
financial or accounting data included or incorporated by reference in the
Original Registration Statement, the Registration Statement, the Disclosure
Package or the Prospectus, or with respect to the Form T-1 included in the
Original Registration Statement and the Registration Statement.

         Choate, Hall & Stewart LLP may rely upon the opinion of Woodburn and
Wedge as to all matters governed by or relating to the law of the State of
Nevada.




                                      B-5






              FORM OF LOCK-UP AGREEMENT FROM DIRECTORS AND OFFICERS


                                                                       EXHIBIT C

August [  ], 2006

[representative]

[address of representative]


Re:      Offering of 20,000,000 Shares of
         Common Stock by Sierra Pacific Resources

Dear Sirs:

         The undersigned, a stockholder and an officer of Sierra Pacific
Resources, a Nevada corporation (the "COMPANY"), understands that [underwriter]
("[underwriter]") has entered into a Purchase Agreement (the "PURCHASE
AGREEMENT") with the Company providing for the public offering of 20,000,000
shares (the "SECURITIES") of the Company's common stock, par value $1.00 per
share (the "COMMON STOCK"). In recognition of the benefit that such an offering
will confer upon the undersigned as a stockholder and an officer of the Company,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the undersigned agrees with each underwriter
named in the Purchase Agreement that, during a period of 60 days from the date
of the Purchase Agreement (the "LOCK-UP PERIOD"), the undersigned will not,
without the prior written consent of the [underwriter], directly or indirectly,
(i) offer, pledge, sell, contract to sell, sell any option or contract to
purchase, purchase any option or contract to sell, grant any option, right or
warrant for the sale of, or otherwise dispose of or transfer any shares of the
Company's Common Stock or any securities convertible into or exchangeable or
exercisable for Common Stock, whether now owned or hereafter acquired by the
undersigned or with respect to which the undersigned has or hereafter acquires
the power of disposition, or file any registration statement under the
Securities Act of 1933, as amended, with respect to any of the foregoing
(collectively, the "LOCK-UP SECURITIES") or (ii) enter into any swap or any
other agreement or any transaction that transfers, in whole or in part, directly
or indirectly, the economic consequence of ownership of the Common Stock,
whether any such swap or transaction is to be settled by delivery of Common
Stock or other securities, in cash or otherwise.

         Notwithstanding the foregoing, and subject to the conditions below, the
undersigned may transfer the Lock-Up Securities without the prior written
consent of the [underwriter]:

                  (a)      as a bona fide gift or gifts; or

                  (b)      upon the undersigned's death, by gift, will or
                           intestate succession to the undersigned's immediate
                           family; or



                                      C-1


                  (c)      to any trust for the direct or indirect benefit of
                           the undersigned or the immediate family of the
                           undersigned; or

                  (d)      as a distribution to limited partners or stockholders
                           of the undersigned;

provided that (1) the [underwriter] receives a signed lock-up agreement for the
balance of the Lock-Up Period from each donee, trustee, distributee, or
transferee, as the case may be, (2) any such transfer shall not involve a
disposition for value, (3) such transfers are not required to be reported in any
public report or filing with the Securities and Exchange Commission, or
otherwise and (4) the undersigned does not otherwise voluntarily effect any
public filing or report regarding such transfers.

         For purposes of this lock-up agreement, "immediate family" shall mean
any relationship by blood, marriage or adoption, not more remote than first
cousin.

         Notwithstanding the foregoing, if:

         (1)      during the last 17 days of the Lock-Up Period, the Company
issues an earnings release or material news or a material event relating to the
Company occurs; or

         (2)      prior to the expiration of the Lock-Up Period, the Company
announces that it will release earnings results or becomes aware that material
news or a material event will occur during the 16-day period beginning on the
last day of the Lock-Up Period,

the restrictions imposed by this lock-up agreement shall continue to apply until
the expiration of the 18-day period beginning on the issuance of the earnings
release or the occurrence of the material news or material event, as applicable,
unless [the underwriter] waives, in writing, such extension.

                  The undersigned hereby acknowledges and agrees that written
notice of any extension of the Lock-Up Period pursuant to the previous paragraph
will be delivered by [the underwriter] to the Company (in accordance with
Section 11 of the Purchase Agreement) and that any such notice properly
delivered will be deemed to have been given to, and received by, the
undersigned. The undersigned further agrees that, prior to engaging in any
transaction or taking any other action that is subject to the terms of this
lock-up agreement during the period from the date of this lock-up agreement to
and including the 34th day following the expiration of the initial Lock-Up
Period, it will give notice thereof to the Company and will not consummate such
transaction or take any such action unless it has received written confirmation
from the Company that the Lock-Up Period (as may have been extended pursuant to
the previous paragraph) has expired.

         The undersigned also agrees and consents to the entry of stop transfer
instructions with the Company's transfer agent and registrar against the
transfer of the Lock-Up Securities except in compliance with the foregoing
restrictions.

                  [remainder of page intentionally left blank]




                                      C-2






                                    Very truly yours,

                                    Signature:
                                               ---------------------------------

                                    Print Name:
                                                --------------------------------





                                      C-3