Document:

<PAGE>

                                                                   EXHIBIT 10.13

FORM OF EMPLOYEE SUBSCRIPTION AGREEMENT

The following officers executed the attached form of subscription agreement with
TNPC, Inc.:

<TABLE>
<CAPTION>
Name                                                 Number of Shares
----                                                 ----------------
<S>                                                  <C>
H. Eugene Lockhart                                       18,000
William I Jacobs                                         18,000
James P. Badum                                           18,000
David A. Eichinger                                       18,000
Marc E. Manly                                            18,000
A.S.A. Wyatt                                              6,000
Kathryn A. Johnson                                        5,000
Stephen A. Nolan                                         12,000
Timothy E. Vail                                          18,000
Kathleen E. Magruder                                      1,000
Jennifer H. Tektiriois                                   18,000
Rebecca M. George                                        18,000
Paul Halpern                                              8,000
</TABLE>

<PAGE>

                                                                      (Officers)

                              SUBSCRIPTION AGREEMENT

         THIS SUBSCRIPTION AGREEMENT (the "Agreement") is entered into
between TNPC, Inc., a Delaware corporation (the "Company"), and the
individual named on the signature page hereof ("Stockholder").

         WHEREAS, Stockholder has agreed to contribute cash to the Company in
exchange for shares of non-voting common stock, par value $0.01 per share, of
the Company ("Non-Voting Common Stock"); and

         WHEREAS, Stockholder and the Company wish to set forth the terms on
which the shares of Non-Voting Common Stock will be issued to Stockholder.

         NOW, THEREFORE, for and in consideration of the foregoing premises,
mutual covenants, rights and obligations set forth herein, the benefits to be
derived therefrom and for other good and valuable consideration, the receipt
and sufficiency of which are hereby expressly acknowledged by the parties
hereto, the parties hereto agree as follows:

                                   ARTICLE I

                                  SUBSCRIPTION

         1.1   SUBSCRIPTION BY STOCKHOLDER.  Stockholder hereby subscribes
for and agrees to accept from the Company, and the Company agrees to issue
and deliver to Stockholder, the number of shares of Non-Voting Common Stock
set forth on the signature page hereto (the "Shares") in exchange for a cash
payment by Stockholder to the Company in the amount of $2,159.76 per share.
Stockholder shall make such cash payment on or before August 22, 2000, and
the Company shall then issue to Stockholder such number of Shares subscribed
for in this Agreement.

         1.2   AGREEMENT TO BE BOUND.  Stockholder agrees that the Shares
shall be subject to the terms of this Agreement and the certificate of
incorporation and by-laws of the Company as they may be amended from time to
time.

                                   ARTICLE II

                              GENERAL PROVISIONS;
                     REPRESENTATIONS, WARRANTIES AND COVENANTS

         2.1   BUSINESS OPPORTUNITY AGREEMENT.  Stockholder hereby ratifies
and approves the Business Opportunity Agreement dated January 6, 2000 by and
between Enron Corp., an Oregon corporation, and the Company.

<PAGE>

         2.2   REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER.  Stockholder
represents and warrants to the Company that the following is true as of the
date hereof:

               (a)  Stockholder is acquiring the Shares for Stockholder's own
         account, solely for investment purposes, and not with a view to, or
         for resale in connection with, any distribution of the Shares.

               (b)  Stockholder understands that the Shares will not be
         registered under the Securities Act of 1933, as amended (the
         "Securities Act") or any federal or state law by reason of specific
         exemptions under the provisions thereof, the availability of which
         depends in part upon the bona fide nature of Stockholder's
         investment intent and upon the accuracy of Stockholder's
         representations made in this Section 2.2.

               (c)  Stockholder understands that the Company is relying upon
         the representations and agreements contained in this Section 2.2 for
         the purpose of determining whether this transaction meets the
         requirements for such exemptions.

               (d)  Stockholder is an "accredited investor" as defined in
         Rule 501(a) under the Securities Act.

               (e)  Stockholder has such knowledge, skill and experience in
         business, financial and investment matters that Stockholder is
         capable of evaluating the merits and risks of an investment in the
         Shares.  Stockholder recognizes that an investment in the Shares is
         a speculative investment involving a high degree of risk.  Stockholder
         is and will be able to bear the economic risks of this investment
         and, consequently, without limiting the generality of the foregoing,
         Stockholder is and will be able to hold the Shares for an extended
         period of time and will have a sufficient net worth to sustain a
         loss of Stockholder's entire investment in the Shares in the event
         such loss should occur.

               (f)  Stockholder understands that the Shares will be "restricted
         securities" under applicable federal securities laws and that the
         Securities Act and the Securities and Exchange Commission (the
         "Commission") provide in substance that Stockholder may dispose of
         the Shares only pursuant to an effective registration statement
         under the Securities Act or an exemption therefrom, and Stockholder
         understands that the Company will have no obligation to register any
         of the Shares.

               (g)  Stockholder has been furnished by the Company with
         information (or provided access to information) regarding the
         business and financial condition of the Company, its expected plans
         for future business activities, the attributes of the Shares and the
         merits and risks of an investment in the Shares that Stockholder has
         requested or otherwise needs to evaluate the investment in the
         Shares, including, but not limited to, a copy of the Company's draft
         registration statement on Form S-1 dated July 7, 2000.

         2.3   REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY. The
Company represents and warrants to Stockholder that the following is true as
of the date hereof:

                                       2
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               (a)  The Company is a corporation duly organized, validly
         existing and in good standing under the laws of its state of
         incorporation, and has the corporate power and authority to carry on
         its business as presently conducted.  The Company is in good
         standing in each jurisdiction in which the properties owned or
         leased by it or the operation of its business makes such
         qualification necessary, except to the extent that the failure to be
         so qualified would not have a material adverse effect on the
         financial condition, business or operations (a "Material Adverse
         Effect") on the Company and its subsidiaries taken as a whole, or
         prevent or materially delay the consummation of the transactions
         contemplated by this Agreement.

               (b)  The Company has the corporate power and authority to
         execute, deliver and perform its obligations under this Agreement
         and to consummate the transactions contemplated hereunder.  The
         execution and delivery of this Agreement by the Company, the
         performance by the Company of its obligations hereunder, and the
         consummation by the Company of the transactions contemplated hereby
         have been duly authorized by all requisite corporate action on the
         part of the Company.

               (c)  This Agreement has been duly executed and delivered by
         the Company, and (assuming due execution and delivery of this
         Agreement by Stockholder) this Agreement constitutes a legal, valid
         and binding obligation of the Company, enforceable against it in
         accordance with its terms, except as such enforceability may be
         limited by applicable bankruptcy, insolvency, reorganization,
         moratorium or other laws of general application referring to or
         affecting enforcement of creditors' rights and general principles of
         equity.

               (d)  The Shares (including any shares of Common Stock issuable
         upon conversion thereof) issued by the Company to Stockholder are
         duly authorized, and when issued will be validly issued and
         fully-paid and non-assessable.  No Person will have any preemptive
         or similar rights with respect to the Shares (including any shares
         of Common Stock issuable upon conversion thereof), except as have
         been effectively waived.  As used herein, a "Person" means any
         individual, partnership, firm, corporation, association, trust,
         unincorporated organization or other entity.

               (e)  The execution, delivery and performance of this Agreement
         by the Company does not and will not (i)violate, conflict with or
         result in the breach of any provision of its certificate of
         incorporation or bylaws, (ii)conflict with or violate any law,
         governmental regulation or governmental order applicable to it or
         any of its assets, properties or businesses or (iii)conflict with,
         result in any breach of, constitute a default (or event which with
         the giving of notice or lapse of time, or both, would become a
         default) under, require any consent under, or give to others any
         rights of termination, amendment, acceleration, suspension,
         revocation or cancellation of, or result in the creation of any
         encumbrance on any of the Company's assets or properties pursuant
         to, any note, bond, mortgage or indenture, contract, agreement,
         lease, sublease, license, permit, franchise or other instrument or
         arrangement to which the Company is a party or by which any of its
         assets or properties is bound or affected; except to the extent that
         any

                                       3
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         conflict under (ii) or (iii) above would not have a Material Adverse
         Effect on the Company and its subsidiaries taken as a whole.

               (f)  The execution, delivery and performance of this Agreement
         by the Company does not and will not require any consent, approval,
         authorization or other order of, action by, filing with or
         notification to any governmental or other regulatory authority or
         agency other than the filing of a Form D with the Commission.

                                  ARTICLE III

                            TRANSFERS OF SECURITIES

         3.1   GENERAL RULE.  Any sale, assignment, exchange or other transfer
or disposition, direct or indirect (collectively, a "Transfer"), by Stockholder
of the Shares shall be governed by this Agreement. Notwithstanding the
foregoing, the term "Transfer" shall not include (a) any disposition pursuant
to an exchange, merger, recapitalization, consolidation or reorganization
involving the Company in which securities of the Company or any other Person
are issued in respect of the Shares or (b) a conversion of the Shares into
shares of common stock, par value $0.01 per share, of the Company ("Common
Stock").  Any attempted Transfer of all or any portion of the Shares, other
than in accordance with the terms of this Agreement, shall be null and void.

         3.2   VOLUNTARY TRANSFER.  Without first obtaining the Company's
written consent, (a) prior to December 31, 2001, Stockholder shall not make any
voluntary Transfer of the Shares, and (b), on or after December 31, 2001,
Stockholder shall not make any voluntary Transfer of the Shares other than a
Transfer for cash that complies with the provisions of Section 3.3 below.

         3.3   RIGHT OF FIRST REFUSAL.

               (a)  On or after December 31, 2001, prior to any Transfer or
         attempted Transfer by Stockholder of some or all of the Shares (the
         "Offered Shares") for cash, Stockholder shall (i) give prior written
         notice (a "Transfer Notice") to the Company of Stockholder's
         intention to effect such Transfer, describing the terms and
         conditions of the proposed Transfer, including the identity of the
         prospective transferee(s), the number of shares of Offered Shares
         Stockholder desires to sell and the purchase price. After receipt of
         the Transfer Notice, the Company shall have the option for 30 days
         from the date of receipt of the Transfer Notice to elect to purchase
         all, but not less than all, of the Offered Shares upon the same
         terms and conditions as those set forth in the Transfer Notice by
         delivering a written notice (the "Election Notice") of such election
         to Stockholder within such 30-day period.  Stockholder shall not
         consummate such Transfer until the earlier to occur of the lapse of
         the 30-day period or the date on which the Company notifies
         Stockholder in writing that it will not exercise its rights under
         this Section 3.3 (the "Authorization Date").  If the Company has
         elected not to purchase all of the Offered Shares or has failed to
         make a timely election, Stockholder may Transfer all, but not less
         than all, of the Offered Shares to the prospective transferee(s)
         thereof specified in the Transfer Notice, at a price and on terms no
         more favorable to such prospective

                                       4
<PAGE>

         transferee(s) than as specified in the Transfer Notice, during the
         30-day period immediately following the Authorization Date, subject
         to Sections 3.7 and 3.8 hereof.  Each of the certificates issued
         upon such Transfer shall bear the restrictive legends set forth in
         the second paragraph of Section 3.10 hereto, unless in the reasonable
         judgment of counsel for the Company such legend is not required in
         order to ensure compliance with the Securities Act.  If the Offered
         Shares are not so transferred within such 30-day period, such
         Offered Shares must be re-offered to the Company in accordance with
         the provisions of this Section 3.3 if Stockholder still desires to
         Transfer the Offered Shares.

               (b)  If the Company exercises the right to purchase the
         Offered Shares by timely delivery of the Election Notice, unless
         otherwise agreed by Stockholder and the Company, the closing will
         take place at the offices of the Company in Greenwich, Connecticut,
         or such other location as the Company's principal place of business
         may be, on the fifth business day after the date of the Election
         Notice.  At the closing, the Company will pay the purchase price set
         forth in the Transfer Notice in cash (by certified or cashier's
         check) solely upon Stockholder's delivery to the Company of valid
         certificates evidencing all of the Offered Shares then being
         purchased pursuant to the Election Notice.  Certificates
         representing the Offered Shares will be duly endorsed for transfer
         to the Company.  By delivery of such certificates to the Company,
         Stockholder will be deemed to represent and warrant to the Company
         that the transferred Offered Shares are owned by Stockholder free
         and clear of all liens, adverse claims, and other encumbrances other
         than as provided in this Agreement.  Stockholder will promptly
         perform, whether before or after any such closing, such additional
         acts (including, without limitation, executing and delivering
         additional documents) as are reasonably required by the Company to
         effect the transactions contemplated by this Section 3.3.

               (c)  The rights of the Company under this Section 3.3 may be
         assigned or transferred in whole or in part by the Company, without
         any consent or other action on the part of any other party hereto,
         to any one or more affiliates of the Company (as defined for
         purposes of Rule 405 under the Securities Act, an "Affiliate").

         3.4   INVOLUNTARY TRANSFER.  In the event of an involuntary Transfer
of the Shares by Stockholder (including, but not limited to, Transfers
resulting from death of Stockholder, the initiation of bankruptcy proceedings
against Stockholder, the entry of a divorce decree directly involving
Stockholder, the execution of either a judgment or a foreclosure by a court
of law against Stockholder or any other event that would have the effect of
forcing Stockholder to Transfer the Shares to a third party), Stockholder
shall give written notice (an "Involuntary Transfer Notice") to the Company
promptly after the occurrence of the event which caused such involuntary
Transfer.  After receipt of an Involuntary Transfer Notice, the Company shall
have the option for 30 days from the date of receipt of the Involuntary
Transfer Notice to elect to purchase such Stockholder's Shares within such
30-day period at their Fair Market Value.  As used herein, Fair Market Value
shall mean such reasonable and fair value as determined in good faith by the
board of directors of the Company using a generally accepted method of
valuation.  In the event of the death of Stockholder, any Transfer of the
Shares to the Stockholder's spouse or descendants shall not be subject to
this Section 3.4 (but shall be subject to Section 3.7).  In the event that
Stockholder's employment with the Company is terminated by the Company for
cause

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<PAGE>

within the meaning of his or her employment agreement, such event shall be
deemed to be an involuntary Transfer for purposes of this Section 3.4 and
Stockholder shall be forced to offer to sell the Shares to the Company in
compliance with this Section 3.4.

         3.5   DRAG ALONG RIGHTS.  In connection with any Transfer by Enron
Energy Services, LLC ("EES") and its Affiliates of all of their shares of
Common Stock or securities convertible into or exercisable for Common Stock
("Common Stock Equivalents") to any transferee or group of related
transferees (other than an Affiliate of EES), EES or its Affiliate shall have
the right to require Stockholder to Transfer all, but not less than all, of
the Shares to such transferee or transferees on the same terms and for the
exact same consideration on a per share basis as received by EES or its
Affiliate in such Transfer.  Stockholder shall not be required to make any
representations or warranties in connection with such Transfer other than
representations and warranties as to (i) Stockholder's ownership of the
Shares to be Transferred free and clear of all liens, claims and encumbrances,
(ii) Stockholder's power and authority to effect such Transfer and (iii) such
matters pertaining to compliance with securities laws as the transferee may
reasonably require.  The closing of such purchase by the transferee shall be
on the same date that the transferee acquires shares from EES or its Affiliate
provided that Stockholder is given 10 days advance notice of such closing.

         3.6   TERMINATION OF CERTAIN TRANSFER PROVISIONS.  Upon the
consummation of a firm commitment underwritten public offering of Common Stock
(an "Initial Public Offering"), Sections 3.2, 3.3, 3.4, 3.5 and 3.7 hereof
shall automatically terminate.  The Company shall be under no obligation to
undertake the filing or completion of an Initial Public Offering.

         3.7   CONDITIONS TO TRANSFERS; CONTINUED APPLICABILITY OF AGREEMENT.
As a condition to any Transfer permitted under this Agreement, any
transferee of the Shares shall be required to become a party to this
Agreement by executing an Adoption Agreement in substantially the form of
EXHIBIT A hereto, and shall have all the obligations of a party hereunder and
the rights that are expressly provided for herein.  If any Person acquires
Shares from a party to this Agreement in a Transfer notwithstanding such
Person's failure to execute an Adoption Agreement in accordance with the
preceding sentence, such Person and such Shares shall be subject to this
Agreement, even if such Person is not a party to this Agreement.

         3.8   TRANSFERS SUBJECT TO COMPLIANCE WITH SECURITIES ACT.  Stockholder
acknowledges that the Shares have not been registered under the Securities
Act and agrees that no sale, transfer, assignment, hypothecation or other
disposition of the Shares shall be made in the absence of (a) a current
registration statement under the Securities Act as to the Shares and the
registration or qualification of the Shares under any applicable state
securities laws that is then in effect or (b) an opinion of counsel
reasonably satisfactory to the Company to the effect that such registration
or qualification is not required.

         3.9   LOCK-UP AGREEMENT.  In connection with any Initial Public
Offering, Stockholder agrees to enter into an agreement on such terms as may
be reasonably requested by the underwriters for the public offering not to
directly or indirectly, sell, transfer or otherwise dispose of or transfer
the economic benefits and burdens of, any of the Shares for a period of

                                       6
<PAGE>

time following such Initial Public Offering as such underwriter may reasonably
request but not to exceed 180 days.

         3.10  RESTRICTIVE LEGENDS.  Each certificate representing Shares
held by Stockholder, and each certificate representing Shares issued to any
subsequent transferee, shall be stamped or otherwise imprinted with a legend
in substantially the following form:

               THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AND OTHER
         TERMS AND CONDITIONS SET FORTH IN A SUBSCRIPTION AGREEMENT BETWEEN THE
         COMPANY AND STOCKHOLDER, A COPY OF WHICH MAY BE OBTAINED FROM THE
         COMPANY AT ITS PRINCIPAL EXECUTIVE OFFICES.

               THE SECURITY REPRESENTED BY THIS CERTIFICATE HAS NOT BEEN
         REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED ("SECURITIES
         ACT"), OR ANY STATE SECURITIES LAWS. THE SECURITY MAY NOT BE OFFERED
         FOR SALE, SOLD, PLEDGED, TRANSFERRED, OR OTHERWISE DISPOSED OF IN THE
         ABSENCE OF (A) A CURRENT REGISTRATION STATEMENT UNDER THE SECURITIES
         ACT AS TO THE SECURITY AND THE REGISTRATION OR QUALIFICATION UNDER ANY
         APPLICABLE STATE SECURITIES LAWS THAT IS THEN IN EFFECT OR (B) AN
         OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY TO THE
         EFFECT THAT SUCH REGISTRATION OR QUALIFICATION IS NOT REQUIRED.

         3.11  OTHER ACTION.  The Company and Stockholder shall use
reasonable efforts to take, or cause to be taken, all appropriate action, and
to do, or cause to be done, all things necessary, proper or advisable under
applicable laws to consummate and make effective the transactions
contemplated hereunder, including, without limitation, using reasonable
efforts to obtain all licenses, permits, consents, approvals, authorizations,
qualifications and orders of the competent governmental entities.

                                   ARTICLE IV

                                 MISCELLANEOUS

         4.1   ENTIRE AGREEMENT; TERMINATION OF PRIOR AGREEMENT.  This
Agreement contains the entire agreement among the parties with respect to the
subject matter hereof and supersedes all prior agreements, written or oral,
with respect thereto.

         4.2   WAIVERS AND AMENDMENTS.  This Agreement may be amended,
superseded, canceled, renewed or extended only by a written instrument signed
by the parties hereto.  The provisions hereof may be waived in writing by the
parties hereto.  No delay on the part of any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof, nor shall any
waiver on the part of any party of any such right, power or privilege, nor
any single or

                                       7
<PAGE>

partial exercise of any such right, power or privilege, preclude any further
exercise thereof or the exercise of any other such right, power or privilege.

         4.3   REGISTRATION OF TRANSFERS.  If, in the reasonable judgment of
counsel to the Company, a proposed Transfer by Stockholder would constitute a
violation of this Agreement, then the Company may refuse to register such
proposed Transfer of Shares on the stock transfer records of the Company and
give related instructions to its stock transfer agent, if any, to stop the
registration of such proposed Transfer of Shares to the extent reasonably
necessary to avoid such violation.

         4.4   NOTICES.

               (a)  Any notice or other communication required or permitted
         hereunder shall be in writing and shall be delivered personally by
         hand or by recognized overnight courier, telecopied or mailed (by
         registered or certified mail, postage prepaid) as follows:

                    (i)   If to Stockholder, then to the address set forth on
               the signature page hereto.

                    (ii)  If to the Company, then to:

                          TNPC, Inc.
                          10 Glenville Street
                          Greenwich, Connecticut 06831
                          Attention: General Counsel
                          Facsimile: (203) 531-0404

               (b)  Each such notice or other communication shall be effective
         (i) if given by telecopier, when such telecopy is transmitted to the
         telecopier number specified in Section4.4(a) (with confirmation of
         transmission), or (ii) if given by any other means, when delivered at
         the address specified in Section 4.4(a).  Any party by notice given in
         accordance with this Section 4.4 to the other party may designate
         another address (or telecopier number) or person for receipt of notices
         hereunder.  Notices by a party may be given by counsel to such party.

         4.5   GOVERNING LAW.

               (a)  THIS AGREEMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY
         AND ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND CONSTRUED IN
         ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, WITHOUT GIVING
         EFFECT TO THE CONFLICT OF LAWS RULES THEREOF.

               (b)  THE PARTIES AGREE THAT THE STATE OF DELAWARE SHALL HAVE
         SOLE AND EXCLUSIVE JURISDICTION OVER ANY ACTION BROUGHT TO ENFORCE THE
         TERMS OF THIS AGREEMENT AND THAT THE PARTIES

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         HEREBY CONSENT TO SUITS IN THE COURTS OF THE STATE OF DELAWARE AND
         WAIVE THE DEFENSES OF PERSONAL JURISDICTION, SERVICE AND VENUE.

         4.6   SEVERABILITY.  If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
void or unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall continue in full force and effect and
shall in no way be affected, impaired or invalidated so long as the economic
or legal substance of the transactions contemplated hereby is not affected in
any manner materially adverse to any party.  Upon such determination that any
term, provision, covenant or restriction is invalid, void or unenforceable,
the parties hereto shall negotiate in good faith to modify this Agreement so
as to effect the original intent of the parties as closely as possible in an
acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the fullest extent possible.

         4.7   COUNTERPARTS.  The Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original as against any
party whose signature appears thereon, and all of which shall together
constitute one and the same instrument.  This Agreement shall become binding
when one or more counterparts hereof, individually or taken together, shall
bear the signatures of all of the parties reflected hereon as the signatories.

         4.8   ASSIGNMENT.  Except as expressly provided herein, this
Agreement shall not be assigned by any party without the express written
consent of the other party hereto (which consent may be granted or withheld
in the sole discretion of any party).

         4.9   THIRD PARTY BENEFICIARY.  As a result of the rights granted to
EES in Section 3.5 hereof, EES shall be considered a third party beneficiary
of this Agreement entitled to enforce such provision as though it were a
party hereto.

                            (SIGNATURE PAGE FOLLOWS)

                                   *  *  *  *  *

                                       9
<PAGE>

         IN WITNESS WHEREOF, the undersigned have executed this Agreement as
of the ___ day of July, 2000.

                                       TNPC, INC.

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

                                       STOCKHOLDER*

                                       ------------------------------------
                                       Name:
                                            -------------------------------
                                       Address:
                                               ----------------------------
                                       Facsimile:
                                                 --------------------------
                                       State of principal residence:
                                                                    -------
                                       Number of Shares:
                                                        -------------------

*    Stockholder certifies that he or she is an "accredited investor" as
defined in Rule 501 of Regulation D promulgated pursuant to the Securities
Act by initialing one or more of the categories below for which Stockholder
qualifies:

----------     (a)  A natural person whose individual net worth, or joint net
                    worth with his or her spouse, exceeds $1,000,000.

----------     (b)  A natural person who had an individual income in excess of
                    $200,000 in each of the last two years or joint income with
                    his or her spouse in excess of $300,000 in each of the last
                    two years and who reasonably expects to reach the same level
                    of individual or joint income this year.

                                    SPOUSAL CONSENT

         The spouse of Stockholder is aware of, understands and consents to
the provisions of the foregoing Agreement and its binding effect upon any
community property interest or marital settlement awards he or she may now or
hereafter own or receive, and agrees that the termination of such spouse's
marital relationship with Stockholder for any reason shall not have the
effect of removing any Shares subject to this Agreement from coverage thereof
and such spouse's awareness, consent and agreement is evidenced by his or her
signature below.

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

                                       10
<PAGE>

                                                                      EXHIBIT A

                                   ADOPTION AGREEMENT

         This Adoption Agreement ("Adoption") is executed pursuant to the
terms of the Subscription Agreement dated as of July __, 2000 between TNPC,
Inc. (the "Company") and _______________ ("Stockholder") (the "Subscription
Agreement"), a copy of which is attached hereto by the transferee
("Transferee") executing this Adoption Agreement.  By the execution of this
Adoption Agreement, the Transferee agrees as follows:

         1.    ACKNOWLEDGMENT.  Transferee acknowledges that Transferee is
acquiring shares of Non-Voting Common Stock from a stockholder of the
Company, subject to the terms and conditions of the Subscription Agreement.
Capitalized terms used herein without definition are defined in the
Subscription Agreement and are used herein with the same meanings set forth
therein.

         2.    AGREEMENT.  Transferee (a) agrees that the shares of
Non-Voting Common Stock acquired by Transferee shall be bound by and subject
to the terms of the Subscription Agreement and (b) hereby joins in, and
agrees to be bound by, the Subscription Agreement with the same force and
effect as if he were originally a party thereto.  Transferee represents and
warrants that all of the representations and warranties made by Stockholder
in Section 2.2 of the Subscription Agreement are true and correct as to the
Transferee as if such Transferee were Stockholder.

         3.    NOTICE.  Any notice required as permitted by the Subscription
Agreement shall be given to Transferee at the address listed below
Transferee's signature below.

         EXECUTED AND DATED on this _____ day of ____________, ________.

                                       TRANSFEREE:

                                       By:
                                          ----------------------------------
                                       Notice
                                       Address:
                                               -----------------------------
                                               -----------------------------
                                               -----------------------------

                                       11<PAGE>
                                                                       (LOU PAI)

                             SUBSCRIPTION AGREEMENT

         THIS SUBSCRIPTION AGREEMENT (the "Agreement") is entered into and
effective as of July 12, 2000 between TNPC, Inc., a Delaware corporation (the
"Company"), and Lou L. Pai, a resident of the State of Texas ("Stockholder").

         WHEREAS, Stockholder has agreed to contribute cash to the Company in
exchange for shares of non-voting common stock, par value $0.01 per share, of
the Company ("Non-Voting Common Stock"); and

         WHEREAS, Stockholder and the Company wish to set forth the terms on
which the shares of Non-Voting Common Stock will be issued to Stockholder.

         NOW, THEREFORE, for and in consideration of the foregoing premises,
mutual covenants, rights and obligations set forth herein, the benefits to be
derived therefrom and for other good and valuable consideration, the receipt and
sufficiency of which are hereby expressly acknowledged by the parties hereto,
the parties hereto agree as follows:

                                    ARTICLE I

                                  SUBSCRIPTION

         1.1 SUBSCRIPTION BY STOCKHOLDER. Stockholder hereby subscribes for and
agrees to accept from the Company, and the Company agrees to issue and deliver
to Stockholder 2,315 shares of Non-Voting Common Stock (the "Shares", which term
shall be deemed to include shares of voting common stock into which such shares
are converted) in exchange for a cash payment by Stockholder to the Company in
the amount of $2,159.76 per share. Stockholder shall make such cash payment on
or before August 22, 2000, and the Company shall then issue to Stockholder such
number of Shares subscribed for in this Agreement.

         1.2 AGREEMENT TO BE BOUND. Stockholder agrees that the Shares shall be
subject to the terms of this Agreement and the certificate of incorporation and
by-laws of the Company as they may be amended from time to time.

                                   ARTICLE II

                               GENERAL PROVISIONS;
                    REPRESENTATIONS, WARRANTIES AND COVENANTS

         2.1 BUSINESS OPPORTUNITY AGREEMENT. Stockholder hereby ratifies and
approves the Business Opportunity Agreement dated January 6, 2000 by and between
Enron Corp., an Oregon corporation, and the Company.

<PAGE>

         2.2 REPRESENTATIONS, WARRANTIES AND COVENANTS OF STOCKHOLDER.
Stockholder represents and warrants to the Company that the following is true as
of the date hereof:

                  (a) Stockholder is acquiring the Shares for his own account,
         solely for investment purposes, and not with a view to, or for resale
         in connection with, any distribution of the Shares.

                  (b) Stockholder understands that the Shares will not be
         registered under the Securities Act of 1933, as amended (the
         "Securities Act") or any federal or state law by reason of specific
         exemptions under the provisions thereof, the availability of which
         depends in part upon the bona fide nature of his investment intent and
         upon the accuracy of his representations made in this Section 2.2.

                  (c) Stockholder understands that the Company is relying upon
         the representations and agreements contained in this Section 2.2 for
         the purpose of determining whether this transaction meets the
         requirements for such exemptions.

                  (d) Stockholder is an "accredited investor" as defined in
         Rule 501(a) under the Securities Act.

                  (e) Stockholder has such knowledge, skill and experience in
         business, financial and investment matters that Stockholder is capable
         of evaluating the merits and risks of an investment in the Shares.
         Stockholder recognizes that an investment in the Shares is a
         speculative investment involving a high degree of risk. Stockholder is
         and will be able to bear the economic risks of this investment and,
         consequently, without limiting the generality of the foregoing,
         Stockholder is and will be able to hold the Shares for an extended
         period of time and will have a sufficient net worth to sustain a loss
         of Stockholder's entire investment in the Shares in the event such loss
         should occur.

                  (f) Stockholder understands that the Shares will be
         "restricted securities" under applicable federal securities laws and
         that the Securities Act and the Securities and Exchange Commission (the
         "Commission") provide in substance that Stockholder may dispose of the
         Shares only pursuant to an effective registration statement under the
         Securities Act or an exemption therefrom, and Stockholder understands
         that, except as provided elsewhere in this Agreement, the Company will
         have no obligation to register any of the Shares.

                  (g) Stockholder has been furnished by the Company with
         information (or provided access to information) regarding the business
         and financial condition of the Company, its expected plans for future
         business activities, the attributes of the Shares and the merits and
         risks of an investment in the Shares that he has requested or otherwise
         needs to evaluate the investment in the Shares, including, but not
         limited to, a copy of the Company's draft registration statement on
         Form S-1 dated July 7, 2000.

                  (h) Stockholder agrees to take such action as may be required
         to prevent the Shares from being subject to any community property
         interest.

                                       2
<PAGE>

         2.3 REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY. The
Company represents and warrants to Stockholder that the following is true as of
the date hereof:

                  (a) The Company is a corporation duly organized, validly
         existing and in good standing under the laws of its state of
         incorporation, and has the corporate power and authority to carry on
         its business as presently conducted. The Company is in good standing in
         each jurisdiction in which the properties owned or leased by it or the
         operation of its business makes such qualification necessary, except to
         the extent that the failure to be so qualified would not have a
         material adverse effect on the financial condition, business or
         operations (a "Material Adverse Effect") on the Company and its
         subsidiaries taken as a whole, or prevent or materially delay the
         consummation of the transactions contemplated by this Agreement.

                  (b) The Company has the corporate power and authority to
         execute, deliver and perform its obligations under this Agreement and
         to consummate the transactions contemplated hereunder. The execution
         and delivery of this Agreement by the Company, the performance by the
         Company of its obligations hereunder, and the consummation by the
         Company of the transactions contemplated hereby have been duly
         authorized by all requisite corporate action on the part of the
         Company.

                  (c) This Agreement has been duly executed and delivered by the
         Company, and (assuming due execution and delivery of this Agreement by
         Stockholder) this Agreement constitutes a legal, valid and binding
         obligation of the Company, enforceable against it in accordance with
         its terms, except as such enforceability may be limited by applicable
         bankruptcy, insolvency, reorganization, moratorium or other laws of
         general application referring to or affecting enforcement of creditors'
         rights and general principles of equity.

                  (d) The Shares issued by the Company to Stockholder are duly
         authorized, and when issued will be validly issued and fully-paid and
         non-assessable. The shares of voting common stock, par value $0.01 per
         share, of the Company issuable upon conversion of the Shares (the
         "Conversion Shares") are duly authorized, and when issued upon
         conversion of the Shares, will be validly issued, fully paid and
         nonassessable. No Person will have any preemptive or similar rights
         with respect to the Shares or Conversion Shares, except as have been
         effectively waived. As used herein, a "Person" means any individual,
         partnership, firm, corporation, association, trust, unincorporated
         organization or other entity.

                  (e) The execution, delivery and performance of this Agreement
         by the Company does not and will not (i) violate, conflict with or
         result in the breach of any provision of its certificate of
         incorporation or bylaws, (ii) conflict with or violate any law,
         governmental regulation or governmental order applicable to it or any
         of its assets, properties or businesses or (iii) conflict with, result
         in any breach of, constitute a default (or event which with the giving
         of notice or lapse of time, or both, would become a default) under,
         require any consent under, or give to others any rights of termination,

                                       3
<PAGE>

         amendment, acceleration, suspension, revocation or cancellation of, or
         result in the creation of any encumbrance on any of the Company's
         assets or properties pursuant to, any note, bond, mortgage or
         indenture, contract, agreement, lease, sublease, license, permit,
         franchise or other instrument or arrangement to which the Company is a
         party or by which any of its assets or properties is bound or affected;
         except to the extent that any conflict under (ii) or (iii) above would
         not have a Material Adverse Effect on the Company and its subsidiaries
         taken as a whole.

                  (f) The execution, delivery and performance of this Agreement
         by the Company does not and will not require any consent, approval,
         authorization or other order of, action by, filing with or notification
         to any governmental or other regulatory authority or agency other than
         the filing of a Form D with the Commission.

                  (g) The Company covenants that, if after the date hereof and
         until the date on which the Shares are fully converted into shares of
         common stock, par value $0.01 per share, of the Company ("Common
         Stock") in accordance with the Amended and Restated Certificate of
         Incorporation of the Company, filings are required under the
         Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the
         "HSR Act") so that the Shares may be converted into shares of Common
         Stock, the Company will upon the written request of Stockholder, and
         Stockholder will upon the written request of the Company, (i) file or
         cause to be filed, as promptly as practicable after the receipt of such
         notice and in no event later than fifteen (15) business days after the
         receipt of such notice, with the Federal Trade Commission and the
         United States Department of Justice, all reports and other documents
         required to be filed by such party under the HSR Act concerning the
         transactions contemplated in such notice, (ii) promptly comply with or
         cause to be complied with any requests by the Federal Trade Commission
         or the United States Department of Justice for additional information
         so that the waiting period applicable thereto under the HSR Act shall
         expire as soon as practicable, and (iii) cooperate with the Company in
         requesting early termination of any applicable waiting period under the
         HSR Act. The Company will reimburse Stockholder for any filing fees in
         connection with such filing by Stockholder.

                  (h) The Company covenants that, until the consummation of a
         firm commitment underwritten public offering of Common Stock registered
         under the Securities Act (an "Initial Public Offering"), it will
         deliver to Stockholder (as long as Stockholder is not a director of the
         Company):

                           (i) as soon as practicable and in any event within
                  fifteen (15) days after the end of each calendar month, a
                  report showing in reasonable detail the financial and
                  operating performance and results for the prior calendar
                  month;

                           (ii) as soon as practicable and in any event within
                  sixty (60) days after the end of each quarterly period (other
                  than the last quarterly period) in each fiscal year,
                  consolidated statements of income, changes in stockholders'
                  equity and changes in financial position of the Company for
                  such quarterly period and for the period from the beginning of
                  the current fiscal year to the end of such quarterly

                                       4
<PAGE>

                  period, and a consolidated balance sheet of the Company as at
                  the end of such quarterly period, all unaudited but prepared
                  in accordance with generally accepted accounting principles
                  ("GAAP") on a basis consistent with past practice;

                           (iii) as soon as practicable and in any event within
                  ninety (90) days after the end of each fiscal year,
                  consolidated statements of income, changes in stockholders'
                  equity and changes in financial position of the Company for
                  such year, and a consolidated balance sheet of the Company as
                  at the end of such year, in each case audited for the Company
                  by independent public accountants of recognized national
                  standing selected by the Company from among the five largest
                  accounting firms in the United States, whose report shall
                  state that such consolidated financial statements present
                  fairly the results of operations, cash flows and financial
                  position of the Company in accordance with GAAP on a basis
                  consistent with prior periods except as noted therein and that
                  the examination by such accountants has been made in
                  accordance with generally accepted auditing standards; and

                           (iv) as soon as practicable, and in any event within
                  the applicable time period specified in the instructions to
                  Form 8-K under the Securities Exchange Act of 1934, notice of
                  any event that would be required to be reported on such form
                  if the Company were then required to file such reports.

                                   ARTICLE III

                             TRANSFERS OF SECURITIES

         3.1 GENERAL RULE. Any sale, assignment, exchange or other transfer or
disposition, direct or indirect (collectively, a "Transfer"), by Stockholder of
the Shares shall be governed by this Agreement. Notwithstanding the foregoing,
the term "Transfer" shall not include (a) any disposition pursuant to an
exchange, merger, recapitalization, consolidation or reorganization involving
the Company in which securities of the Company or any other Person are issued in
respect of the Shares or (b) a conversion of the Shares into shares of Common
Stock. Any attempted Transfer of all or any portion of the Shares, other than in
accordance with the terms of this Agreement, shall be null and void.

         3.2 VOLUNTARY TRANSFER. Without first obtaining the Company's written
consent, (a) prior to December 31, 2001, Stockholder shall not make any
voluntary Transfer of the Shares, and (b), on or after December 31, 2001,
Stockholder shall not make any voluntary Transfer of the Shares other than a
Transfer for cash that complies with the provisions of Section 3.3 below.

         3.3 RIGHT OF FIRST REFUSAL.

                  (a) On or after December 31, 2001, prior to any Transfer or
         attempted Transfer by Stockholder of some or all of the Shares (the
         "Offered Shares") for cash, Stockholder shall (i) give prior written
         notice (a "Transfer Notice") to the Company of Stockholder's intention
         to effect such Transfer, describing the terms and conditions of the

                                       5
<PAGE>

         proposed Transfer, including the identity of the prospective
         transferee(s), the number of shares of Offered Shares Stockholder
         desires to sell and the purchase price. After receipt of the Transfer
         Notice, the Company shall have the option for 30 days from the date of
         receipt of the Transfer Notice to elect to purchase all, but not less
         than all, of the Offered Shares upon the same terms and conditions as
         those set forth in the Transfer Notice by delivering a written notice
         (the "Election Notice") of such election to Stockholder within such
         30-day period. Stockholder shall not consummate such Transfer until the
         earlier to occur of the lapse of the 30-day period or the date on which
         the Company notifies Stockholder in writing that it will not exercise
         its rights under this Section 3.3 (the "Authorization Date"). If the
         Company has elected not to purchase all of the Offered Shares, has
         failed to make a timely election or fails in any material respect to
         purchase the Offered Shares in accordance with Section 3.3(b) below,
         Stockholder may Transfer all, but not less than all, of the Offered
         Shares to the prospective transferee(s) thereof specified in the
         Transfer Notice, at a price and on terms no more favorable to such
         prospective transferee(s) than as specified in the Transfer Notice,
         during the 30-day period immediately following the Authorization Date,
         subject to Sections 3.7 and 3.8 hereof. Each of the certificates issued
         upon such Transfer shall bear the restrictive legends set forth in the
         second paragraph of Section 3.10 hereto, unless in the reasonable
         judgment of counsel for the Company such legend is not required in
         order to ensure compliance with the Securities Act. If the Offered
         Shares are not so transferred within such 30-day period, such Offered
         Shares must be re-offered to the Company in accordance with the
         provisions of this Section 3.3 if Stockholder still desires to Transfer
         the Offered Shares.

                  (b) If the Company exercises the right to purchase the Offered
         Shares by timely delivery of the Election Notice, unless otherwise
         agreed by Stockholder and the Company, the closing will take place at
         the offices of the Company in Greenwich, Connecticut, or such other
         location as the Company's principal place of business may be, on the
         fifth business day after the date of the Election Notice. At the
         closing, the Company will pay the purchase price set forth in the
         Transfer Notice in cash (by certified or cashier's check) solely upon
         Stockholder's delivery to the Company of valid certificates evidencing
         all of the Offered Shares then being purchased pursuant to the Election
         Notice. Certificates representing the Offered Shares will be duly
         endorsed for transfer to the Company. By delivery of such certificates
         to the Company, Stockholder will be deemed to represent and warrant to
         the Company that the transferred Offered Shares are owned by
         Stockholder free and clear of all liens, adverse claims, and other
         encumbrances other than as provided in this Agreement. Stockholder will
         promptly perform, whether before or after any such closing, such
         additional acts (including, without limitation, executing and
         delivering additional documents) as are reasonably required by the
         Company to effect the transactions contemplated by this Section 3.3.

         3.4 INVOLUNTARY TRANSFER. In the event of an involuntary Transfer of
the Shares by Stockholder (including, but not limited to, Transfers resulting
from death of Stockholder, the initiation of bankruptcy proceedings against
Stockholder, the entry of a divorce decree directly involving Stockholder, the
execution of either a judgment or a foreclosure by a court of law against
Stockholder or any other event that would have the effect of forcing Stockholder
to

                                       6
<PAGE>

Transfer the Shares to a third party), Stockholder shall give written notice
(an "Involuntary Transfer Notice") to the Company promptly after the occurrence
of the event which caused such involuntary Transfer. After receipt of an
Involuntary Transfer Notice, the Company shall have the option for 30 days from
the date of receipt of the Involuntary Transfer Notice to elect to purchase such
Stockholder's Shares within such 30-day period at their Fair Market Value. As
used herein, Fair Market Value shall mean such reasonable and fair value as
determined in good faith by the board of directors of the Company using a
generally accepted method of valuation. In the event of the death of
Stockholder, any Transfer of the Shares to the Stockholder's spouse or
descendants shall not be subject to this Section 3.4 (but shall be subject to
Section 3.7).

         3.5 DRAG ALONG RIGHTS. In connection with any Transfer by Enron Energy
Services, LLC ("EES") and its affiliates (as defined for purposes of Rule 405
under the Securities Act, "Affiliates") of all of their shares of Common Stock
or securities convertible into or exercisable for Common Stock ("Common Stock
Equivalents") to any transferee or group of related transferees (other than an
Affiliate of EES), EES or its Affiliate shall have the right to require
Stockholder to Transfer all, but not less than all, of the Shares to such
transferee or transferees on the same terms and for the exact same consideration
on a per share basis as received by EES or its Affiliate in such Transfer.
Stockholder shall not be required to make any representations or warranties in
connection with such Transfer other than representations and warranties as to
(i) Stockholder's ownership of the Shares to be Transferred free and clear of
all liens, claims and encumbrances, (ii) Stockholder's power and authority to
effect such Transfer and (iii) such matters pertaining to compliance with
securities laws as the transferee may reasonably require. The closing of such
purchase by the transferee shall be on the same date that the transferee
acquires shares from EES or its Affiliate PROVIDED that Stockholder is given 10
days advance notice of such closing.

         3.6 TERMINATION OF CERTAIN TRANSFER PROVISIONS. Upon the consummation
of an Initial Public Offering, Sections 3.2, 3.3, 3.4, 3.5 and 3.7 hereof shall
automatically terminate. The Company shall be under no obligation to undertake
the filing or completion of an Initial Public Offering.

         3.7 CONDITIONS TO TRANSFERS; CONTINUED APPLICABILITY OF AGREEMENT. As a
condition to any Transfer permitted under this Agreement, any transferee of the
Shares shall be required to become a party to this Agreement by executing an
Adoption Agreement in substantially the form of EXHIBIT A hereto, and shall have
all the obligations of a party hereunder and the rights that are expressly
provided for herein. If any Person acquires Shares from a party to this
Agreement in a Transfer notwithstanding such Person's failure to execute an
Adoption Agreement in accordance with the preceding sentence, such Person and
such Shares shall be subject to this Agreement, even if such Person is not a
party to this Agreement.

         3.8 TRANSFERS SUBJECT TO COMPLIANCE WITH SECURITIES ACT. Stockholder
acknowledges that the Shares have not been registered under the Securities Act
and agrees that no sale, transfer, assignment, hypothecation or other
disposition of the Shares shall be made in the absence of (a) a current
registration statement under the Securities Act as to the Shares and the
registration or qualification of the Shares under any applicable state
securities laws that is then in effect or (b)

                                       7

<PAGE>

an opinion of counsel reasonably satisfactory to the Company to the effect
that such registration or qualification is not required.

         3.9 LOCK-UP AGREEMENT. In connection with any Initial Public Offering,
Stockholder agrees to enter into an agreement on such terms as may be reasonably
requested by the underwriters for the public offering not to directly or
indirectly, sell, transfer or otherwise dispose of or transfer the economic
benefits and burdens of, any of the Shares for a period of time following such
Initial Public Offering as such underwriter may reasonably request but not to
exceed 180 days.

         3.10 RESTRICTIVE LEGENDS. Each certificate representing Shares held by
Stockholder, and each certificate representing Shares issued to any subsequent
transferee, shall be stamped or otherwise imprinted with a legend in
substantially the following form:

                  THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AND OTHER
         TERMS AND CONDITIONS SET FORTH IN A SUBSCRIPTION AGREEMENT BETWEEN THE
         COMPANY AND STOCKHOLDER, A COPY OF WHICH MAY BE OBTAINED FROM THE
         COMPANY AT ITS PRINCIPAL EXECUTIVE OFFICES.

                  THE SECURITY REPRESENTED BY THIS CERTIFICATE HAS NOT BEEN
         REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED ("SECURITIES
         ACT"), OR ANY STATE SECURITIES LAWS. THE SECURITY MAY NOT BE OFFERED
         FOR SALE, SOLD, PLEDGED, TRANSFERRED, OR OTHERWISE DISPOSED OF IN THE
         ABSENCE OF (A) A CURRENT REGISTRATION STATEMENT UNDER THE SECURITIES
         ACT AS TO THE SECURITY AND THE REGISTRATION OR QUALIFICATION UNDER ANY
         APPLICABLE STATE SECURITIES LAWS THAT IS THEN IN EFFECT OR (B) AN
         OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY TO THE EFFECT
         THAT SUCH REGISTRATION OR QUALIFICATION IS NOT REQUIRED.

         3.11 REGISTRATION RIGHTS.

              (a) The Company agrees that after the effectiveness of an
Initial Public Offering (or such later date as applicable in accordance with
Section 3.9 hereof), Stockholder will be entitled to piggyback registration
rights to include any of the Conversion Shares (used herein, the "Piggyback
Securities") in any registration statement filed by the Company with the
Commission to register for sale shares of Common Stock by the Company for its
own account or for the account of any holder of Common Stock or Common Stock
Equivalents as defined in the Stockholders Agreement, as amended, dated as of
January 6, 2000, among the Company, EES and certain institutional investors
named therein (the "Investor Stockholders Agreement") (other than a
registration statement on Form S-4 or Form S-8 or any successor forms thereto
or other than in connection with an exchange offer or offering solely to the
Company's existing security holders). Each time the Company proposes to so
file a registration statement with respect to which Stockholder has the right
to request inclusion of Piggyback Securities, the Company shall

                                      8
<PAGE>

give written notice of such proposed filing to Stockholder as soon as
practicable (but in no event less than 15 days before the anticipated filing
date of such registration statement) and, upon the written request by
Stockholder which shall be given to the Company within 15 days after delivery
by the Company of the notice of intent to file a registration statement,
Stockholder may include in such registration Piggyback Securities (which
request by Stockholder shall specify the number of Piggyback Securities
proposed to be included in such registration). Stockholder shall be permitted
to withdraw all or part of Stockholder's Piggyback Securities from such a
registration at any time prior to the effective date thereof. The Company
shall use commercially reasonable efforts to cause all such shares of
Piggyback Securities that Stockholder has requested to be included in such
registration to be sold on the same terms and conditions as the Common Stock
otherwise being sold in such registration; PROVIDED, HOWEVER, that if the
managing underwriter or underwriters advises the Company, that in their
opinion the total amount of the securities, including Piggyback Securities,
to be included such offering is sufficiently large to cause a material and
adverse affect on the price or success of the offering, then the number of
Piggyback Securities included by Stockholder shall be reduced at the same
time and on the same basis as the number of shares included by other holders
of Piggyback Securities (as defined in the Investor Stockholders Agreement)
who are not deemed to be Requesting Holders (as defined in the Investor
Stockholders Agreement) with respect to such registration. Notwithstanding
the foregoing, Stockholder shall not have any piggyback registration rights
with respect to Conversion Shares if, on the date of filing of a registration
statement by the Company, (a) Stockholder is entitled to sell his Conversion
Shares pursuant to Rule 144(k) (or any comparable successive provision)
promulgated under the Securities Act or (b) if the Stockholder could sell all
of his Conversion Shares within a three-month period under Rule 144 (or any
comparable successive provision) promulgated under the Securities Act. The
Company may suspend, terminate or withdraw a piggyback registration statement
at any time in its sole discretion.

              (b) The Company shall pay the following registration expenses
(the "Registration Expenses"): (a) all registration and filing fees (including,
without limitation, with respect to filings to be made with the Commission and
the National Association of Securities Dealers, Inc.), (b) fees and expenses of
compliance with securities or blue sky laws (including reasonable fees and
disbursements of counsel in connection with blue sky qualifications of the
Piggyback Securities), (c) printing expenses, (d) internal expenses (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), (e) the fees and expenses incurred in
connection with the listing on an exchange of the Piggyback Securities if the
Company shall choose to list such Piggyback Securities, (f) reasonable fees and
disbursements of counsel for the Company and customary fees and expenses for
independent certified public accountants retained by the Company, (g) the
reasonable fees and expenses of any special experts retained by the Company in
connection with such registration and (h) fees and expenses of any "qualified
independent underwriter" or other independent appraiser participating in any
offering pursuant to Section 3 of Schedule E to the By-laws of the National
Association of Securities Dealers, Inc. The Company shall not have any
obligation to pay any underwriting fees, discounts, or commissions attributable
to the sale of Piggyback Securities or, except as provided by clause (b) or (h)
above, any out-of-pocket expenses of Stockholder (or the agents who manage
Stockholder's accounts) or the fees and disbursements of any underwriter
attributable to the sale of Piggyback Securities.

                                      9
<PAGE>

         3.12 OTHER ACTION. The Company and Stockholder shall use reasonable
efforts to take, or cause to be taken, all appropriate action, and to do, or
cause to be done, all things necessary, proper or advisable under applicable
laws to consummate and make effective the transactions contemplated hereunder,
including, without limitation, using reasonable efforts to obtain all licenses,
permits, consents, approvals, authorizations, qualifications and orders of the
competent governmental entities.

                                   ARTICLE IV

                                  MISCELLANEOUS

         4.1 ENTIRE AGREEMENT; TERMINATION OF PRIOR AGREEMENT. This Agreement
contains the entire agreement among the parties with respect to the subject
matter hereof and supersedes all prior agreements, written or oral, with respect
thereto.

         4.2 WAIVERS AND AMENDMENTS. This Agreement may be amended, superseded,
canceled, renewed or extended only by a written instrument signed by the parties
hereto. The provisions hereof may be waived in writing by the parties hereto. No
delay on the part of any party in exercising any right, power or privilege
hereunder shall operate as a waiver thereof, nor shall any waiver on the part of
any party of any such right, power or privilege, nor any single or partial
exercise of any such right, power or privilege, preclude any further exercise
thereof or the exercise of any other such right, power or privilege.

         4.3 REGISTRATION OF TRANSFERS. If, in the reasonable judgment of
counsel to the Company, a proposed Transfer by Stockholder would constitute a
violation of this Agreement, then the Company may refuse to register such
proposed Transfer of Shares on the stock transfer records of the Company and
give related instructions to its stock transfer agent, if any, to stop the
registration of such proposed Transfer of Shares to the extent reasonably
necessary to avoid such violation.

         4.4 NOTICES.

             (a) Any notice or other communication required or permitted
         hereunder shall be in writing and shall be delivered personally by hand
         or by recognized overnight courier, telecopied or mailed (by registered
         or certified mail, postage prepaid) as follows:

                 (i)      If to Stockholder, then to the address set forth on
             the signature page hereto.

                 (ii)     If to the Company, then to:

                                      10
<PAGE>

                                    TNPC, Inc.
                                    10 Glenville Street
                                    Greenwich, Connecticut 06831
                                    Attention:       General Counsel
                                    Facsimile:       (203) 531-0404

             (b) Each such notice or other communication shall be effective
         (i) if given by telecopier, when such telecopy is transmitted to the
         telecopier number specified in Section 4.4(a) (with confirmation of
         transmission), or (ii) if given by any other means, when delivered at
         the address specified in Section 4.4(a). Any party by notice given in
         accordance with this Section 4.4 to the other party may designate
         another address (or telecopier number) or person for receipt of notices
         hereunder. Notices by a party may be given by counsel to such party.

         4.5 GOVERNING LAW.

             (a) THIS AGREEMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY AND
         ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND CONSTRUED IN
         ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, WITHOUT GIVING
         EFFECT TO THE CONFLICT OF LAWS RULES THEREOF.

             (b) THE PARTIES AGREE THAT THE STATE OF DELAWARE SHALL HAVE SOLE
         AND EXCLUSIVE JURISDICTION OVER ANY ACTION BROUGHT TO ENFORCE THE TERMS
         OF THIS AGREEMENT AND THAT THE PARTIES HEREBY CONSENT TO SUITS IN THE
         COURTS OF THE STATE OF DELAWARE AND WAIVE THE DEFENSES OF PERSONAL
         JURISDICTION, SERVICE AND VENUE.

         4.6 SEVERABILITY. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction to be invalid, void
or unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall continue in full force and effect and shall
in no way be affected, impaired or invalidated so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term,
provision, covenant or restriction is invalid, void or unenforceable, the
parties hereto shall negotiate in good faith to modify this Agreement so as to
effect the original intent of the parties as closely as possible in an
acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the fullest extent possible.

         4.7 COUNTERPARTS. The Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original as against any
party whose signature appears thereon, and all of which shall together
constitute one and the same instrument. This Agreement shall become binding when
one or more counterparts hereof, individually or taken together, shall bear the
signatures of all of the parties reflected hereon as the signatories.

                                      11
<PAGE>

         4.8 ASSIGNMENT. Except as expressly provided herein, this Agreement
shall not be assigned by any party without the express written consent of the
other party hereto (which consent may be granted or withheld in the sole
discretion of any party). Notwithstanding the foregoing, the rights of
Stockholder set forth in Section 3.11 of this Agreement may be assigned to any
Person who acquires some or all of the Shares or Conversion Shares in compliance
with Article III. Any assignment of the rights set forth in Section 3.11
pursuant to this Section 4.8 shall be effective only upon receipt by the Company
of written notice from the assignor stating the name and address of any
assignee.

         4.9 THIRD PARTY BENEFICIARY. As a result of the rights granted to EES
in Section 3.5 hereof, EES shall be considered a third party beneficiary of this
Agreement entitled to enforce such provision as though it were a party hereto.

                            (SIGNATURE PAGE FOLLOWS)

                                   * * * * *

                                       12
<PAGE>

         IN WITNESS WHEREOF, the undersigned have executed this Agreement on the
date first written above.

                                   TNPC, INC.

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

                                   STOCKHOLDER

                                   -----------------------------------
                                                Lou L. Pai
                                   Address:
                                           ---------------------------
                                           ---------------------------
                                   Fax No.:
                                           ---------------------------

                                      13
<PAGE>

                                                                       EXHIBIT A

                               ADOPTION AGREEMENT

         This Adoption Agreement ("Adoption") is executed pursuant to the terms
of the Subscription Agreement dated as of July 12, 2000 between TNPC, Inc. (the
"Company") and _______________ ("Stockholder") (the "Subscription Agreement"), a
copy of which is attached hereto by the transferee ("Transferee") executing this
Adoption Agreement. By the execution of this Adoption Agreement, the Transferee
agrees as follows:

         1. ACKNOWLEDGMENT. Transferee acknowledges that Transferee is acquiring
Shares from a stockholder of the Company, subject to the terms and conditions of
the Subscription Agreement. Capitalized terms used herein without definition are
defined in the Subscription Agreement and are used herein with the same meanings
set forth therein.

         2. AGREEMENT. Transferee (a) agrees that the Shares acquired by
Transferee shall be bound by and subject to the terms of the Subscription
Agreement and (b) hereby joins in, and agrees to be bound by, the Subscription
Agreement with the same force and effect as if he were originally a party
thereto. Transferee represents and warrants that all of the representations and
warranties made by Stockholder in Section 2.2 of the Subscription Agreement are
true and correct as to the Transferee as if such Transferee were Stockholder.

         3. NOTICE. Any notice required as permitted by the Stockholders
Agreement shall be given to Transferee at the address listed below Transferee's
signature below.

         EXECUTED AND DATED on this _____ day of ____________, ________.

                                            TRANSFEREE:

                                            By:
                                               -------------------------------
                                            Notice

                                            Address:
                                                    --------------------------
                                                    --------------------------
                                                    --------------------------

                                      14

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