<PAGE>

                         BUSINESS OPPORTUNITY AGREEMENT


         This Business Opportunity Agreement (this "Agreement") is entered into
effective as of the date set forth on the signature page hereof by and between
Enron Corp., an Oregon corporation ("Enron"), and EMW Energy Services Corp., a
Delaware corporation ("EMW").

                                    RECITALS

         This Agreement is being executed and delivered in accordance with the
terms of that certain Contribution and Subscription Agreement, dated as of
December 23, 1999 ("Contribution Agreement"), among Enron Energy Services, LLC
("EES"), an Affiliate of Enron, EMW and certain other Persons (such Persons
other than EES and EMW are referred to herein collectively as the "Investors").
Pursuant to the Contribution Agreement, EES has contributed certain assets and
services to EMW and the Investors have contributed cash to EMW, all on the terms
and conditions set forth in the Contribution Agreement. EES and the Investors
have received, in consideration for their respective contributions to EMW,
certain voting and non-voting securities of EMW and, among other rights, the
right to nominate and elect directors to the board of directors of EMW, all on
the terms and conditions set forth in the Contribution Agreement and the
agreements contemplated thereby.

         As a result of the transactions contemplated by the Contribution
Agreement, certain directors, officers or employees of Enron or its Affiliates
may serve as directors of EMW (any such Person being referred to herein as a
"Designee") or officers of EMW (any such Person being referred to herein as a
"Common Officer").

         As the owner of an interest in EMW, Enron and its Affiliates may owe
certain duties to EMW. As directors of EMW, the Designees will owe duties to
EMW. The law relating to duties that Enron or its Affiliates or its Designees
may owe to EMW is not clear. The application of such law to particular
circumstances is often difficult to predict and, if a court were to hold that
Enron or its Affiliates or its Designees breached any such duty, Enron or its
Affiliates or such Designees could be held liable for damages in a legal action
brought on behalf of EMW. The parties recognize that any Common Officer will owe
duties both to EMW and to Enron or its Affiliates.

         EMW believes that it will benefit from the investment being made by EES
in EMW. Enron, however, is unwilling to cause EES to enter into the Contribution
Agreement and to, and to cause EES and its Affiliates to, consummate the
transactions contemplated thereby unless EMW enters into this Agreement because
Enron and its Affiliates engage in certain businesses that are similar to those
in which EMW will engage following the consummation of the transactions
contemplated by the Contribution Agreement. In order to induce Enron to cause
EES to enter into the Contribution Agreement and to, and to cause EES and its
Affiliates to, consummate the transactions contemplated thereby, EMW is willing
to enter into this Agreement in order to renounce, effective as of the date
hereof, any interest or expectancy it or its Affiliates may have in the classes
or categories of business opportunities specified herein that are presented to
or identified by Enron, its Affiliates or any of their Designees or Common
Officers, as more


<PAGE>

fully described herein. As a result of this Agreement, Enron and its Affiliates
may, subject to the terms of that certain Noncompetition Agreement, dated as of
the date hereof ("Noncompetition Agreement"), among Enron, EES and EMW, continue
to conduct their business and to pursue certain business opportunities without
an obligation to offer such opportunities to EMW or any of its Affiliates, and
any Designee or Common Officer may continue to discharge his or her
responsibilities as a director, officer or employee of Enron or any Person in
which Enron has an interest.

                                    AGREEMENT

         In consideration of the foregoing, the mutual covenants, rights, and
obligations set forth in this Agreement, and the benefits to be derived
herefrom, and other good and valuable consideration, the receipt and the
sufficiency of which each of the parties hereto acknowledges and confesses, the
parties hereto agree as follows:

         1.       DEFINITIONS.

                  (a) The following capitalized terms when used in this
         Agreement shall have the meanings set forth below for such terms (with
         terms defined in the singular having the corresponding meaning when
         used in the plural and vice versa), while other terms are defined where
         first used in this Agreement:

                           "AFFILIATE" of a Person means any other Person
                  controlling, controlled by, or under common control with such
                  first Person; PROVIDED that EMW and its Affiliates that it
                  controls shall not be considered to be Affiliates of Enron or
                  its Affiliates. For purposes of this Agreement, the term
                  "control" and its correlative terms means the possession,
                  directly or indirectly, through one or more intermediaries,
                  through the ownership of voting securities, by contract, or
                  otherwise, of the power or authority to exercise a controlling
                  influence over the management of the Person (including serving
                  as manager, managing partner, or general partner of a Person
                  or performing similar functions for a Person).

                           "CLAIMS" means any and all claims, demands, causes of
                  action, liabilities, losses, costs, damages, and expenses of
                  any kind or nature whatsoever, in law or in equity (including
                  attorneys' fees and costs), and irrespective of whether any
                  such claims or matters arise out of common law, contract,
                  tort, strict liability, violation of statutory laws, or
                  regulations, or any other theory or basis.

                           "PERSON" means a natural person, a corporation, a
                  limited liability company, a joint stock company, a
                  partnership, a limited partnership, a joint venture, a trust,
                  an estate, an unincorporated organization, association, agency
                  or any other entity.

                  (b) Unless otherwise provided or unless the context clearly
         requires otherwise, all references to "Sections" are to Sections of
         this Agreement; and all uses of "include" or "including" mean
         "including, without limitation" or "including, but not limited to".


                                       2
<PAGE>

         2. SCOPE OF BUSINESS OF EMW AND ITS AFFILIATES.

                  (a) EMW hereby renounces any interest or expectancy in any
         business opportunity that does not consist exclusively of the
         businesses permitted by the terms of the Amended and Restated
         Certificate of Incorporation of EMW in effect on the date hereof or as
         may hereafter be amended in accordance with the terms thereof and
         applicable law (the " Designated Business").

                  (b) Enron has advised EMW that Enron entered into a Purchase
         and Sale Agreement, dated as of March 31, 1999, among Enron, Enron
         Solar Energy, Inc., and Enron Renewable Energy Corp., on the one hand,
         and Amoco Technology Company, Amoco Solar Holding Company, and BP Amoco
         Corporation, on the other hand, by which Enron agreed that it and
         certain Affiliates of Enron would not engage in certain businesses or
         activities related to the manufacturing or marketing of photovoltaic
         equipment, including modules, systems and components. In furtherance
         thereof, EMW acknowledges and agrees that EMW shall not, during the
         period ending the earlier of April 30, 2002 and such time as EMW and
         Enron agree that EMW is no longer a Controlled Affiliate as such term
         is defined in EXHIBIT A, either directly or indirectly (exclusive of
         any conduct by the Investors or their respective Affiliates that cannot
         be controlled by EMW), conduct any business or activities that
         constitute "Prohibited Business" (as such term is defined on EXHIBIT A
         attached hereto and incorporated herein). EMW agrees to indemnify,
         defend, and hold harmless Enron and its predecessors and successors in
         interest, and all of Enron's and its respective predecessors and
         successors in interests' respective Affiliates, stockholders,
         directors, officers, employees, agents, attorneys, servants, invitees,
         contractors, licensees, legal representatives, successors, and assigns,
         from any and all Claims that may be asserted against Enron or such
         Persons as a result of the breach by EMW of this Section 2(b).

         3. CORPORATE OPPORTUNITIES. EMW recognizes that Enron and its
Affiliates, Designees and Common Officers (a) participate and will continue to
participate in the Designated Business, directly and through Affiliates, (b) may
have interests in, participate with, and maintain seats on the boards of
directors of or serve as officers or employees of other Persons engaged in the
Designated Business and (c) may develop business opportunities for Enron and its
Affiliates and such other Persons. EMW recognizes that (subject to the
Noncompetition Agreement) Enron, its Affiliates, its Designees, its Common
Officers and other Persons may be engaged in a Designated Business. Subject to
the Noncompetition Agreement, EMW (i) acknowledges and agrees that neither
Enron, its Affiliates, its Designees, its Common Officers nor any such other
Person shall be restricted or prohibited by the relationship between Enron and
EMW, or by serving as a director of EMW or Common Officer, from engaging in any
Designated Business or any other business, regardless of whether such business
activity is in direct or indirect competition with the business or activities of
EMW and its Affiliates, on any basis other than actions that are inconsistent
with the standards set forth in Sections 4 and 5 hereof, (ii) acknowledges and
agrees that, as long as their activities are conducted in accordance with the
standards set forth in Sections 4 and 5 hereof, neither Enron, any Affiliate of
Enron, any Designee, any Common Officer nor any such other Person shall have any
obligation to offer


                                       3
<PAGE>

EMW or any of its Affiliates any business opportunity, (iii) renounces any
interest or expectancy in any business opportunity pursued by Enron, any
Affiliate of Enron, any Designee, any Common Officer or any such other Person in
accordance with the standards set forth in Sections 4 and 5 hereof and (iv)
waives any claim that any business opportunity pursued by Enron, any Affiliate
of Enron, any Designee, any Common Officer or any such Person constitutes a
corporate opportunity of EMW or any of its Affiliates that should have been
presented to EMW, unless such business opportunity was pursued in violation of
the standards set forth in Sections 4 and 5 hereof.

         4. STANDARDS FOR SEPARATE CONDUCT OF BUSINESS. Enron, any Affiliate of
Enron, any Designee, any Common Officer or any other Person in which Enron has
an interest or of which a Designee or Common Officer is a director, officer or
employee shall be deemed to meet the standards set forth in this Section 4 if
its business is conducted through the use of its own personnel and assets and
not with the use of any personnel or assets of EMW. Without limiting the
foregoing, such standards will be met with respect to a business opportunity
only if (a) it is identified by or presented to personnel of Enron, such
Affiliate of Enron, such Designee, such Common Officer or such other Person and
developed and pursued solely through the use of their personnel and assets (and
not based on confidential information disclosed by or on behalf of EMW in or
during the course of such Designee's or Common Officer's relationship with EMW),
and (b) it did not come to the attention of such Designee or Common Officer
solely in, and as a direct result of, his or her capacity as a director or
officer of EMW; PROVIDED that (i) if such opportunity is separately identified
by Enron or one of its Affiliates or such other Person, or separately presented
to Enron or one of its Affiliates or such other Person by a Person other than
such Designee or Common Officer, Enron, such Affiliate or such other Person
shall be free to pursue such opportunity even if it also came to the Designee's
or the Common Officer's attention solely as a result of and in his or her
capacity as a director or officer of EMW and (ii) if such opportunity is
presented to or identified by a Designee or Common Officer other than solely as
a result of and in his or her capacity as a director or officer of EMW, Enron or
such Affiliate or such other Person shall be free to pursue such opportunity
even if it also came to the Designee's or Common Officer's attention as a result
of and in his or her capacity as a director or officer of EMW. Any business
opportunity that comes to the attention of a Designee or Common Officer solely
as a result of and in his or her capacity as a director or officer of EMW, and
otherwise not meeting the standards set forth in this Section 4, shall be a
business opportunity for EMW and any Designee or Common Officer shall not be
relieved of any duty under applicable law to present such opportunity to EMW nor
shall such person be released or indemnified under Section 6 hereof for any
failure to do so. Nothing in this Agreement shall be interpreted to allow a
Designee or Common Officer to pursue a business opportunity in the Designated
Business solely for his or her personal benefit (as opposed to for the benefit
of Enron, an Affiliate or Enron or any such other Person).

         5. PROVISIONS APPLICABLE TO OPPORTUNITIES INVOLVING COMMON OFFICERS.
Enron agrees that it will not pursue any business opportunity in the Designated
Business that is first presented to a Common Officer (I.E., the first officer,
director or employee of Enron or an Affiliate of Enron to receive notice of such
opportunity from a third party is also an officer of EMW), or that such Common
Officer identified on his or her own, unless Enron first offers such opportunity
to EMW and within a reasonable period of time EMW notifies Enron in writing that


                                       4
<PAGE>

EMW elects not to pursue such opportunity. Enron agrees that, in connection with
any such opportunity presented to EMW, Enron will furnish to EMW all information
in Enron's possession or reasonably available to Enron regarding the opportunity
in question that is material to a decision by EMW whether or not to pursue such
opportunity; PROVIDED, HOWEVER, that as a condition to the furnishing of such
information, Enron may require EMW to enter into a written confidentiality
agreement to protect any non-public, confidential, or proprietary information of
Enron, its Affiliates or any other Person.

         6. INDEMNITY AND RELEASE. In further consideration of the benefits
received and to be received by EMW pursuant to the Contribution Agreement and
the transactions contemplated thereunder, EMW acknowledges and agrees that with
respect to any business opportunity presented to or identified by Enron (which
shall include, for purposes of this Section 6, its predecessors and successors
in interest, and all of Enron's and its respective predecessors and successors
in interests' respective Affiliates, stockholders, directors, officers,
employees, agents, attorneys, servants, invitees, contractors, licensees, legal
representatives, successors, and assigns), which is pursued in accordance with
the standards in Sections 4 and 5 of this Agreement, Enron may pursue such
opportunity and conduct the business related thereto without any obligation to
offer it to EMW. EMW acknowledges and agrees that in such case, to the extent
that a court might hold that the pursuit of such opportunity or the conduct of
such activity is a breach of any standard of care, a duty of loyalty, or other
duty owed to EMW (and without admitting that the pursuit of such opportunity or
the conduct of such activity is such a breach of any such standard or duty), EMW
hereby fully and irrevocably renounces, releases and waives, to the extent
permitted by applicable law, any interest or expectancy in such opportunity or
activity pursued by Enron in accordance with the standards in Sections 4 and 5
of this Agreement and any and all Claims that EMW or any Person claiming by,
through, or under EMW may have to claim that such business opportunity is a
corporate opportunity of EMW or that the pursuit by Enron of any such business
opportunity or the conduct of the business related thereto is a breach of any
standard of care, duty of loyalty, or other duty owed to EMW (including, to the
extent permitted by applicable law, any and all Claims arising either directly
or derivatively, and whether brought by, through, or under EMW, or by any
stockholder, creditor, subsidiary or Affiliate of EMW). Further, EMW, for itself
and its successors and assigns, hereby agrees to indemnify, defend, and hold
harmless, to the extent permitted by applicable law, Enron and its predecessors
and successors in interest, and all of Enron's and its respective predecessors
and successors in interests' respective Affiliates, stockholders, directors,
officers, employees, agents, attorneys, servants, invitees, contractors,
licensees, legal representatives, successors, and assigns, from any and all such
Claims that may be asserted (a) by any Person whomsoever claiming by, through,
or under EMW or (b) by any successors or assigns of EMW. It is the express
intention of EMW that, to the extent permitted by applicable law, the indemnity
to Enron herein provided covers any such Claims asserted by, through, or under
EMW, notwithstanding that such Persons are not signatories to this Agreement,
and whether or not the release provisions are directly enforceable against any
Persons who are not signatories to this Agreement. This indemnity applies for
the benefit of Enron regardless of whether such claims are based in whole or in
part upon the alleged partial or sole negligence or strict liability of Enron
(or its predecessors or successors in interest, or Enron's or its respective
predecessors or successors in interests' respective Affiliates, stockholders,
directors, officers, employees, agents, attorneys, servants, invitees,
contractors, licensees, legal representatives, successors, and assigns), but
shall not apply in the case of bad faith, willful


                                       5
<PAGE>

misconduct or breach of this Agreement by Enron, any Designee or Common Officer
or any other indemnified party. The renunciations, waivers and agreements herein
apply equally to activities to be conducted in the future and activities that
have been conducted in the past.

         7.       MISCELLANEOUS.

                  (a) GOVERNING LAW. This Agreement shall be governed by and
         construed in accordance with the laws of the State of Delaware, without
         giving effect to principles of conflicts of laws.

                  (b) ASSIGNMENT; BINDING EFFECT. No party hereto shall have the
         right to assign this Agreement or any of its rights or obligations
         hereunder without the prior written consent of the other party hereto;
         and any purported assignment of this Agreement or any of the rights or
         obligations of a party hereunder without such consent shall be deemed
         to be null and void ab initio. The terms and conditions of this
         Agreement shall inure to the benefit of and be binding upon the parties
         hereto and their successors and permitted assigns.

                  (c) AMENDMENT; WAIVERS. This Agreement may be altered,
         supplemented, amended, or waived only by the written consent of each
         party hereto.

                  (d) ENTIRE AGREEMENT. This Agreement contains the entire
         understanding of the parties hereto respecting the subject matter
         hereof and supersedes all prior agreements, discussions, and
         understandings with respect thereto.

                  (e) NO PARTNERSHIP. No term or provision of this Agreement
         shall be construed to establish any partnership, agency, or joint
         venture relationship between the parties hereto.

                  (f) INVALIDITY. In the event that any one or more of the
         provisions contained in this Agreement is, for any reason, held
         invalid, illegal, or unenforceable in any respect, such invalidity,
         illegality, or unenforceability will not affect any other provision of
         this Agreement.

                  (g) DUTIES TO EXISTING ENTITIES. EMW acknowledges that Enron
         and its Affiliates have fiduciary and contractual obligations to other
         Persons under existing agreements and relationships and agrees that, in
         the event of a conflict between the duties of Enron or its Affiliates
         under this Agreement and the duties of Enron or its Affiliates to
         Persons under agreements or relationships that exist on the date
         hereof, Enron and its Affiliates shall be entitled to perform their
         duties to such Persons without any liability to EMW or any stockholder,
         creditor, subsidiary or Affiliate of EMW.

                  (h) COUNTERPARTS. This Agreement may be executed in two or
         more counterparts, each of which counterparts shall be deemed to be an
         original and which counterparts together shall constitute one and the
         same agreement of the parties hereto.


                                       6
<PAGE>



         IN WITNESS WHEREOF, the undersigned have duly executed this Agreement
effective as of the ____ day of _____________, 2000.


                                        ENRON CORP.


                                        By:    /s/ J. MARK METTS
                                           -------------------------------------
                                        Name:  J. Mark Metts
                                             -----------------------------------
                                        Title: Executive Vice President--Corp.
                                              ----------------------------------
                                               Development
                                              ----------------------------------


                                        EMW ENERGY SERVICES CORP.


                                        By:    /s/ JIMMIE L. WILLIAMS
                                           -------------------------------------
                                        Name:  Jimmie L. Williams
                                             -----------------------------------
                                        Title: Vice President
                                              ----------------------------------


                                       7
<PAGE>

                                    EXHIBIT A
                                       TO
                         BUSINESS OPPORTUNITY AGREEMENT



         8.3      COVENANT NOT TO COMPETE.

         (a)      COVENANT NOT TO COMPETE. Enron(1) agrees that, until the
third year anniversary of the Closing Date,(2) Enron shall not, and shall
cause its Affiliates(3) that it Controls ("Controlled Affiliates") not to,
directly or indirectly engage in, or possess any interest in any equity
security (as defined in Rule 3a11-1 under the Securities Exchange Act of
1934, as amended) of any Person engaging in, the manufacture or marketing of
photovoltaic equipment, including modules, systems and components
(collectively, the "Prohibited Business"); PROVIDED, HOWEVER, that this
Section 8.3 shall not prohibit or restrict any of the following:

                  (i) the acquisition, directly or indirectly, by Enron or any
         of its Controlled Affiliates of not more than fifteen percent (15%) of
         the equity securities of a publicly traded entity that is engaged in
         any Prohibited Business; or

                  (ii) any acquisition or activities otherwise prohibited by
         this Section 8.3 that are conducted by (A) Enron Oil & Gas Company, a
         Delaware corporation, (B) Northern Border Partners, L.P., a Delaware
         limited partnership, (C) EOTT Energy Partners, L.P., a Delaware limited
         partnership, (D) Citrus Corporation, a Delaware corporation, (E) Azurix
         Corp., a Delaware corporation, or (F) any Person in whom Enron or any
         Controlled Affiliate of Enron owns fifty percent (50%) or less of the
         issued and outstanding voting securities, PROVIDED, HOWEVER, that this
         clause (F) shall not permit Enron or any Controlled Affiliate of Enron
         to, directly or indirectly, form or enter into a new joint venture (of
         whatever structure or legal entity) which will engage in any Prohibited
         Business; and PROVIDED FURTHER, that a Person listed in this Section
         8.3(a)(ii) shall become subject to the obligations of this Section 8.3
         if such Person hereafter becomes a direct or indirect, wholly-owned
         subsidiary of Enron; or

                  (iii) the acquisition, ownership or operation, directly or
         indirectly, by Enron or any of its Controlled Affiliates of all or any
         portion of a Person or its business or assets where not more than
         thirty percent (30%) of the total acquisition value of such acquired
         Person, business or assets is attributable to any Prohibited Business;
         and, PROVIDED FURTHER, that Enron or any such Controlled Affiliate
         shall divest of that portion of any Prohibited Business which exceeds
         the thirty percent (30%) limitation in the event that such Person was
         held to have violated the provisions of this Section 8.3(a)(iii); or

                  (iv) the integration of photovoltaic systems by Enron or any
         of its Controlled Affiliates that is in conjunction with the business
         of providing energy and energy related products

--------
(1) Enron is Enron Corp.
(2) Closing Date was April 30, 1999.
(3) Affiliate" means a Person that directly or indirectly through one or more
intermediaries, Controls, is Controlled by, or is under common Control with, the
first Person. "Control" means the possession, directly or indirectly, of the
power to direct or cause the direction of the management policies of a Person,
whether through the ownership of voting securities, by contract or otherwise.
"Person" means an individual, a partnership, a corporation, an association, a
limited liability company, a joint stock company, a trust, a joint venture, an
unincorporated organization or a Governmental Authority.


                                      A-1
<PAGE>

and services or comprehensive facilities management; PROVIDED that such
photovoltaic systems do not constitute the sole or the primary portion of the
project; and PROVIDED FURTHER that such Persons are prohibited from engaging in
the marketing of photovoltaic equipment, including individual modules and
components, as separate from photovoltaic systems.


                                      A-2