ENRON CAPITAL & TRADE RESOURCES CORP
SC 13D/A, 1999-10-18
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<PAGE>

                          __________________________

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                          __________________________
                                SCHEDULE 13D/A
                   Under the Securities Exchange Act of 1934
                               (Amendment No. 2)

                             Quanta Services, Inc.
                               (Name of Issuer)

                              __________________

                        Common Stock, $.00001 par value
                        (Title of Class of Securities)

                              __________________

                                (CUSIP Number)
                                  74762E 10 2

                              __________________

                                 Julia Murray
                            General Counsel-Finance
                           Enron North America Corp.
                               1400 Smith Street
                             Houston, Texas 77002
                                (713) 853-6161

                      (Name, Address and Telephone Number
                    of Person Authorized to Receive Notices
                              and Communications)

                              __________________

                              September 21, 1999
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
this acquisition that is the subject of this Schedule 13D, and is filing this
Schedule because of Rule 13d-1(e),
         Rule 13d-1(f) or Rule 13d-1(g), check the following box:  [_]

     The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of
                                   the Act.

                          __________________________

                              Page 1 of 22 Pages
<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 74762E 10 2                                    PAGE 2 OF 22 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON;
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Enron North America Corp. (formerly known as Enron Capital & Trade
      Resources Corp.)
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      WC
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          0
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8

     OWNED BY             3,589,090*
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING
                          0
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          3,589,090*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11

                          3,589,090*
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      11.1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
*   Represents shares of Common Stock issuable upon conversion of US $49,350,000
    principal amount of 6 7/8% Convertible Promissory Notes due 2010 by the
    conversion price of US $13.75.
**  Based on information provided by the Issuer as of August 12, 1999.

<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 74762E 10 2                                    PAGE 3 OF 22 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON;
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      ECT Merchant Investments Corp.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          0
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8

     OWNED BY             897,272*
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING
                          0
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          897,272*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11

      897,272*
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      3.0%**
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
*  Represents shares of Common Stock issuable upon conversion of US
   $12,337,500.00 principal amount of 6 7/8% Convertible Promissory Notes due
   2010 by the conversion price of US $13.75.
** Based on information provided by the Issuer as of August 12, 1999.

<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 74762E 10 2                                    PAGE 4 OF 22 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON;
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Enron Corp.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      WC
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Oregon
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          0
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8

     OWNED BY             3,589,090*
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING
                          0
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          3,589,090*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11

      3,589,090*
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      11.1%**
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
- ------------------------------------------------------------------------------
*  Represents shares of Common Stock issuable upon conversion of US $49,350,000
   principal amount of 6 7/8 Convertible Promissory Notes due 2010 by the
   conversion price of US $13.75.
** Based on information provided by the Issuer as of August 12, 1999.

<PAGE>


                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 74762E 10 2                                    PAGE 5 OF 22 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON;
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Joint Energy Development Investments II Limited Partnership
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      WC
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          0
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8

     OWNED BY             2,691,818*
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING
                          0
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          2,691,818*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11

      2,691,818*
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      8.6%**
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      PN
- ------------------------------------------------------------------------------
*   Represents shares of Common Stock issuable upon conversion of US $37,012,500
    principal amount of 6 7/8% Convertible Promissory Notes due 2010 by the
    conversion price of US $13.75.
**  Based on information provided by the Issuer as of August 12, 1999.


<PAGE>

                                                              Page 6 of 22 Pages

                              AMENDMENT NO. 2 TO
                           STATEMENT ON SCHEDULE 13D

     Introductory Note: This Amendment No. 2 to Statement on Schedule 13D is
being filed by Enron Corp., an Oregon corporation ("Enron"), Enron North America
Corp., a Delaware corporation ("ENA"), formerly known as Enron Capital & Trade
Resources Corp., ECT Merchant Investments Corp., a Delaware corporation
("EMIC"), and Joint Energy Development Investments II Limited Partnership, a
Delaware limited partnership ("JEDI II"), which are collectively referred to as
the "Reporting Entities." All information herein with respect to Quanta
Services, Inc., a Delaware corporation (the "Issuer"), and the common stock, par
value $.00001 per share of the Issuer ("Common Stock") is presented to the best
knowledge and belief of the Reporting Entities. Capitalized terms used and not
defined in this Amendment No. 2 to Statement on Schedule 13D have the meanings
set forth in the Schedule 13D. The joint Schedule 13D of Enron, Enron Capital &
Trade Resources Corp., a Delaware corporation ("ECT"), and JEDI II filed October
9, 1998, as amended by a Schedule 13D/A of Enron, ECT, EMIC and JEDI II filed
January 12, 1999, is further amended as follows:

Item 4.  Purpose of Transaction.

     Item 4 of Schedule 13D is hereby amended by adding the following:

     Pursuant to a First Amendment dated September 21, 1999 (the "First
Amendment") to Securities Purchase Agreement and Registration Rights Agreement,
both dated September 29, 1998 (as so amended, the "Purchase Agreement" and the
"Registration Rights Agreement"), the Issuer, EMIC and JEDI II have agreed to
amend certain provisions of the Purchase Agreement and the Registration Rights
Agreement and to take certain other actions as more fully described in the First
Amendment. Further, in connection with the execution of a Securities Purchase
Agreement and related transaction documents (the "Transaction Documents")
between the Issuer and UtiliCorp United Inc. ("UtiliCorp"), EMIC and JEDI II
have executed a letter agreement (the "Letter Agreement") agreeing to waive
certain provisions of the Purchase Agreement and Registration Rights Agreement
in order for the Issuer and UtiliCorp to enter into and perform certain aspects
of the Transaction Documents.

     The First Amendment and the Letter Agreement are each attached as exhibits
to this Amendment No. 2 to Statement on Schedule 13D and incorporated herein by
reference, and the following summaries of the terms of such agreements are
qualified by reference to the actual documents.

     First Amendment.  Under the terms of the First Amendment, the definition of
     ---------------
Registrable Securities contained in the Registration Rights Agreement has been
amended such that the Issuer is required to register for sale under the
Securities Act of 1933, as amended, (i) the Conversion Shares (as defined in the
Registration Rights Agreement) (including shares of Common Stock actually issued
upon conversion of the Convertible Notes), (ii) other shares of Common Stock
acquired by EMIC and/or JEDI II pursuant to Section 2.06 of the Purchase
Agreement, and (iii) the Indenture Notes (as defined in the First Amendment),
the underlying Conversion Shares and any replacement or substitute for, or
reissuance of, any Indenture Notes. The First Amendment also modifies the
provision of the Registration Rights Agreement relating to "piggyback"
registration rights to the extent that a record holder of any Registrable
Securities must share equally, on a share for share basis, with shares sought to
be registered by UtiliCorp. As stated previously, the First Amendment permits
the registration of the Convertible Notes, subject to certain requirements,
including, but not limited to, engaging a nationally recognized indenture
trustee (the "Trustee") and entering into a customary indenture with a Trustee.
<PAGE>

                                                              Page 7 of 22 Pages

     Letter Agreement.  Pursuant to the Letter Agreement, EMIC and JEDI II have
     ----------------
agreed to waive certain provisions of the Purchase Agreement so that the Issuer
and UtiliCorp may enter into and perform certain aspects of the Transaction
Documents. Specifically, EMIC and JEDI II have agreed to waive certain rights
under the Purchase Agreement with respect to (i) the Issuer's issuance to
UtiliCorp of 1,860,000 shares of the Issuer's Series A Convertible Preferred
Stock (the "Preferred Stock") and (ii) the conversion of the Preferred Stock
into Common Stock, all in accordance with the terms of the Transaction
Documents. In addition, EMIC and JEDI II have agreed to waive their rights under
the Purchase Agreement so that the Issuer may pay holders of the Preferred Stock
regularly scheduled dividends so long as the declaration and payment of any such
dividend would not result in a Default or Event of Default (both as defined in
the Purchase Agreement). Similarly, EMIC and JEDI II have agreed to waive their
rights under the Purchase Agreement in order to allow the Issuer and UtiliCorp
to enter into a Management Services Agreement (the "Management Agreement") and
the other transactions contemplated by the Transaction Documents, provided that
the Issuer may only pay the regularly scheduled fee contemplated by the
Management Agreement if the payment of any such fee would not result in a
Default or Event of Default.

     EMIC and JEDI II have also agreed to waive certain provisions of the
Registration Rights Agreement for the benefit of the Issuer and UtiliCorp under
the terms of the Letter Agreement. Specifically, notwithstanding certain
provisions of the Registration Rights Agreement the Issuer may grant to
UtiliCorp certain demand registration rights provided that the consent of EMIC
and JEDI II to the foregoing is based on the agreement of the Issuer and
UtiliCorp that so long as the Purchasers (as defined in the First Amendment) or
their successors and assigns hold Registrable Securities (as defined in the
Registration Rights Agreement), none of the provisions in Article II of the
Investor's Rights Agreement between the Issuer and UtiliCorp may be amended,
modified, expanded or waived without the consent of the Purchasers or their
successors and assigns. Finally, EMIC and JEDI II have agreed to allow the
Issuer to grant certain "piggyback" registration rights to UtiliCorp.

     Other than the transactions described herein, none of the Reporting
Entities, nor to their knowledge any of the persons named in Schedule I hereto
(which sets forth certain additional information with respect to each director
and executive officer of ENA, Enron, Enron Capital II Corp. and EMIC), has any
plan or proposal that would result in any of the consequences listed in
paragraphs (a) - (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer.

     (a)  Neither EMIC nor JEDI II directly owns any Common Stock of the Issuer.
As set forth in this Amendment No. 2 to Statement on Schedule 13D, EMIC directly
owns a Convertible Note in the principal amount of $12,337,500.00 which is
convertible into 897,272 shares of Common Stock of the Issuer and JEDI II
directly owns a Convertible Note in the principal amount of $37,012,500.00 which
is convertible into 2,691,818 shares of Common Stock of the Issuer. If the
Convertible Notes were converted in full by EMIC or JEDI II, respectively, the
shares of Common Stock issuable upon such conversion would represent
approximately 3.0% and 8.6% of the outstanding Common Stock based on the number
of shares of Common Stock outstanding as of August 12, 1999, as reported by the
Issuer on its Form 10-Q for the quarter ended June 30, 1999.

     Enron and ENA may be deemed to beneficially own the shares of Common Stock
issuable upon conversion of the Convertible Notes held by both EMIC and JEDI II;
however, Enron and ENA disclaim any beneficial ownership over such securities.
EMIC disclaims beneficial ownership over the shares of Common Stock issuable
upon conversion of the Convertible Note held by JEDI II, and JEDI II disclaims
<PAGE>

                                                              Page 8 of 22 Pages

beneficial ownership over the shares of Common Stock issuable upon conversion of
the Convertible Note held by EMIC.

     (b)  Enron, ENA and EMIC may be deemed to share voting and dispositive over
the shares of Common Stock issuable upon conversion of the Convertible Note held
by EMIC. Enron, ENA and JEDI II may be deemed to share voting and dispositive
power over the shares of Common Stock issuable upon conversion of the
Convertible Note held by JEDI II.

Item 6.  Contracts, Arrangements, Understanding or Relationships with Respect to
the Securities of the Issuer.

     Item 6 of Schedule 13D is hereby amended by adding the following:

     See the description of the First Amendment and the Letter Agreement in Item
4 above.

Item 7.  Material to be Filed as Exhibits.

     (i)   Joint Filing Agreement by and among the Reporting Entities

     (ii)  First Amendment to Securities Purchase Agreement and Registration
           Rights Agreement dated September 21, 1999

     (iii) Letter Agreement dated September 21, 1999

<PAGE>

                                                              Page 9 of 22 Pages

                               INDEX TO EXHIBITS

(i)   Joint Filing Agreement by and among the Reporting Entities

(ii)  First Amendment to Securities Purchase Agreement and Registration
      Rights Agreement dated September 21, 1999

(iii) Letter Agreement dated September 21, 1999


<PAGE>

                                                             Page 10 of 22 Pages

                            JOINT FILING AGREEMENT
                            ----------------------

     The undersigned each agree that (i) the Statement on Schedule 13D relating
to the Common Stock, $.00001 par value, of Quanta Services, Inc. is adopted and
filed on behalf of each of them, (ii) all future amendments to such Statement on
Schedule 13D will, unless written notice to the contrary is delivered as
described below, be jointly filed on behalf of each of them, and (iii) the
provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934 apply to
each of them. This agreement may be terminated with respect to the obligation to
jointly file future amendments to such Statement on Schedule 13D as to any of
the undersigned upon such person giving written notice thereof to each of the
other persons signatory hereto, at the principal office thereof.

     IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing
Agreement as of the date set forth below.


Dated: October 18, 1999.      ENRON NORTH AMERICA CORP.


                              By: /s/ Angus H. Davis
                                 -------------------------------
                              Name: Angus H. Davis
                                    ----------------------------
                              Title: Vice President and Secretary
                                    ----------------------------



Dated: October 18, 1999.      ENRON CORP.


                              By: /s/ Angus H. Davis
                                 -------------------------------
                              Name: Angus H. Davis
                                    ----------------------------
                              Title: Vice President and Deputy
                                     Corporate Secretary
                                    ----------------------------


Dated: October 18, 1999.      JOINT ENERGY DEVELOPMENT INVESTMENTS II
                               LIMITED PARTNERSHIP

                              By: Enron Capital Management II Limited
                                  Partnership, its General Partner

                              By: Enron Capital II Corp., its general partner

                              By: /s/ Angus H. Davis
                                 -------------------------------
                              Name: Angus H. Davis
                                    ----------------------------
                              Title: Vice President and Secretary
                                    ----------------------------



Dated: October 18, 1999.      ECT MERCHANT INVESTMENTS CORP.


                              By: /s/ Angus H. Davis
                                 -------------------------------
                              Name: Angus H. Davis
                                    ----------------------------
                              Title: Vice President and Secretary
                                    ----------------------------

<PAGE>

                                                             Page 11 of 22 Pages

               FIRST AMENDMENT TO SECURITIES PURCHASE AGREEMENT
                       AND REGISTRATION RIGHTS AGREEMENT


     This FIRST AMENDMENT TO SECURITIES PURCHASE AGREEMENT AND REGISTRATION
RIGHTS AGREEMENT, dated as of September 21, 1999 (this "First Amendment"), is
among QUANTA SERVICES, INC., a corporation duly organized and existing under the
laws of the State of Delaware (the "Borrower"), ECT MERCHANT INVESTMENTS CORP.,
a corporation duly organized and existing under the laws of the State of
Delaware ("EMIC"), and JOINT ENERGY DEVELOPMENT INVESTMENTS II LIMITED
PARTNERSHIP, a limited partnership duly organized and existing under the laws of
the State of Delaware ("JEDI-II").

                                   Recitals

     a.   The Borrower, Enron Capital & Trade Resources Corp., a Delaware
corporation ("ECT") and JEDI-II entered into that certain Securities Purchase
Agreement dated as of September 29, 1998 (the "Securities Agreement") pursuant
to which the Borrower has issued certain convertible subordinated notes to ECT
and JEDI-II, all upon the terms and conditions provided for in the Securities
Agreement. ECT assigned its interest in the Notes and the Securities Agreement
to EMIC and EMIC is successor to ECT with respect to the Notes and the
Securities Agreement.

     b.   The Borrower, ECT and JEDI-II are parties to that certain Registration
Rights Agreement dated as of September 29, 1998 (the "Registration Agreement")
pursuant to which the Borrower has agreed to provide certain registration and
other rights, all upon the terms and conditions provided for in the Registration
Agreement. ECT assigned its interest therein to EMIC and EMIC is successor to
ECT with respect to the Registration Agreement.

     c.   The Borrower, EMIC and JEDI-II have agreed to amend certain provisions
of the Securities Agreement and Registration Agreement and to take certain other
actions as described in this First Amendment.

     d.   Borrower has agreed to issue preferred stock to UtiliCorp United Inc.,
a Delaware corporation ("UtiliCorp.") and contemplate entering into the
Investor's Rights Agreement between UtiliCorp and Borrower (the "Investor's
Rights Agreement").

     e.   NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

     Section 1.  Defined Terms.  Unless otherwise defined in this First
                 -------------
Amendment, each capitalized term used in this First Amendment which is defined
in the Securities Agreement has the meaning assigned to such term in the
Securities Agreement.
<PAGE>

                                                             Page 12 of 22 Pages

     Section 2.  Amendments to Securities Agreement.  The Securities Agreement
                 ----------------------------------
is amended as follows:

     a.   New and Replaced Definitions. Section 1.01 of the Securities Agreement
          ----------------------------
is amended by inserting the following definitions as appropriate:

          "EBIT" means, for any period, on a trailing four fiscal quarter basis,
the sum of Consolidated Net Income plus each of the following to the extent
actually deducted in determining Consolidated Net Income, (a) Consolidated
Interest Expense, and (b) provisions for taxes based on income or revenues, all
calculated on a consolidated basis for the Borrower and its Subsidiaries and as
determined in accordance with GAAP.

          "Management Fee" means the management fee due from the Borrower to
UtiliCorp under the terms of the Management Services Agreement between the
Borrower and UtiliCorp under which UtiliCorp will provide to the Borrower advice
regarding (a) corporate and strategic planning, (b) the development, evaluation
and marketing of the Borrower's products and services, (c) identifying potential
acquisition candidates and additional business opportunities, and (d) other
similar or related services.

          "Minimum Interest Coverage Ratio" means, for any period, the ratio of
(a) EBIT plus the amount of the Management Fee expensed during such period, to
(b) the sum of the Consolidated Interest Expense, plus the amount of any
dividend or distribution in respect of the Preferred Stock paid or scheduled to
be paid during such period, plus the amount of the Management Fee paid during
such period.

          "Obligations" means any and all amounts, liabilities and obligations
owing from time to time by Borrower to the Purchasers or any Successors,
pursuant to any of the Basic Documents and all renewals, extensions and/or
rearrangements thereof, whether such amounts, liabilities or obligations be
liquidated or unliquidated, now existing or hereafter arising, absolute or
contingent.

          "Participation" means, for each Purchaser or any Successor, such
Purchaser's or Successor's proportionate share pertaining to the Obligations.
As of the Effective Date, ECT's Participation shall be 25% and JEDI-II's
Participation shall be 75%.

          "Purchasers" means EMIC and JEDI-II and any of their respective
Affiliates who may become the holders of any Securities, but does not include
any Person who becomes a holder of any Securities who is not an Affiliate of
EMIC or JEDI-II.

          "Purchaser's Account" means for any Purchaser or Successor, the
account specified by such Purchaser or Successor as its Purchaser's Account by
notice in writing to the Borrower.

          "Successors" means the successors and permitted assigns of the
Purchasers that are not Affiliates of Purchasers.

     b.   Section 1.02, Article III, Sections 6.01 through 6.06, Section 6.08,
          --------------------------------------------------------------------
Articles VIII and IX, and Sections 11.01, 11.02, 11.03 and 11.08. Section 1.02,
- ----------------------------------------------------------------
Article III, Sections 6.01 through 6.06, Section 6.08, Articles VIII and IX, and
Sections 11.01, 11.02, 11.03 and 11.08 are each amended by replacing all
references to "Purchaser" or "Purchasers" contained therein with respectively,
"Purchaser and/or any Successor" and "Purchasers and/or any Successors."
<PAGE>

                                                             Page 13 of 22 Pages

     c.   Sections 2.06 and 6.07.  Sections 2.06 and 6.07 are amended by
          ----------------------
replacing (i) "ECT or JEDI-II" with "EMIC, JEDI-II or any of their respective
Affiliates" and (ii) "ECT and JEDI-II" with "EMIC, JEDI-II and any of their
respective Affiliates that become Purchasers."

     d.   Section 7.01. Section 7.01 is amended by deleting the first sentence
          ------------
and replacing it with the following:

          The Borrower will not, and will not permit any Subsidiary to,
          create, incur, assume, guarantee or in any other manner become
          directly or indirectly liable (as to new Indebtedness) for the
          payment of (a) any Prohibited Subordinated Indebtedness, as
          hereafter defined, or (b) any other Indebtedness unless the
          Borrower's Minimum Interest Coverage Ratio is greater than or
          equal to the Minimum Interest Coverage Ratio permitted by the
          Senior Credit Agreement, but in no event shall such ratio be
          less than 2.76 to 1.0.

     e.   Section 11.04.  Section 11.04 is amended by replacing such section in
          -------------
its entirety with the following:

          This Agreement shall be binding upon the Borrower, the
          Purchasers, and their respective Successors. Except as
          expressly provided in this Agreement, this Agreement shall not
          be construed so as to confer any right or benefit upon any
          Person other than the Borrower, the Purchasers, and their
          respective Successors. All or any portion of the rights and
          obligations of the Purchasers and their Successors under this
          Agreement with respect to the Basic Documents may be sold,
          assigned or pledged by any Purchaser or Successor.
          Notwithstanding the foregoing, the Purchasers may transfer the
          rights provided in Sections 2.06, 6.07 or 10.09 only to other
          Purchasers. Upon any assignment of the Basic Documents, the
          assignee shall succeed to all of the assignor's rights and
          obligations under the Basic Documents to the extent assigned
          and the assigning Purchaser or Successor, as applicable, shall
          be automatically released from any such obligations hereunder
          with respect to the Basic Documents to the extent assigned,
          other than the obligations arising under Article X hereof. The
          Conversion Shares may be sold, assigned or pledged and upon any
          assignment complying with the terms of the Registration Rights
          Agreement and upon any such assignment, the holders of the
          Conversion Shares shall succeed to the Purchaser's or any
          Successor's rights and obligations under the Registration
          Rights Agreement. Upon request of any Purchaser or any
          Successor in connection with any transfer of the Notes, the
          Borrower shall execute and deliver any amendment to this
          Agreement, the Notes, and the other Basic Documents reasonably
          requested by the Purchaser or the Successor to reflect the
          transfer and delineate the rights of the transferor and the
          transferee provided that the Borrower shall not be liable for
          the expenses incurred in documenting such amendment. In the
          event that a Purchaser or a Successor grants participations in
          its Note to other Persons, each of such other Persons shall
          have the rights of setoff against any amounts due by the
          Borrower hereunder and similar rights or Liens to the same
          extent as made available to the Purchasers or any Successors.
          The Borrower acknowledges that the Purchasers or any Successors
          may "syndicate" the loan evidenced by the Notes, and the other
          Basic Documents and agree to execute any amendments,
          restatements and other modifications to the Basic Documents in
          connection with such syndication, provided that the Borrower
          shall not be liable for the expenses incurred by Purchasers or
          any Successors in documenting such syndication. The Borrower
          may deem and treat the
<PAGE>

                                                             Page 14 of 22 Pages

          original Purchasers as the owner of the Notes for the purpose
          of receiving payment of principal of and premium (if any) and
          interest on the Notes and for all other purposes whatsoever
          until the Borrower is notified otherwise in writing pursuant to
          Section 11.06 of this Agreement.

     Section 3.  Amendments to Registration Agreement.  The Registration
                 ------------------------------------
Agreement is amended as follows:

     a.   Defined Terms.  For Section 3 only of this First Amendment, each
          -------------
capitalized term used in this Section 3 of the First Amendment which is defined
in the Registration Agreement and not in the Securities Agreement has the
meaning assigned to such term in the Registration Agreement.

     b.   Amended Definition.  Section 1.01 of the Registration Agreement is
          ------------------
amended by amending the definition of "Registrable Securities" to read, in its
entirety, as follows:

          "Registrable Securities " means any of the following: (i) the
          Conversion Shares (including shares of Common Stock actually
          issued upon conversion of the Notes), (ii) other shares of
          Common Stock acquired by EMIC and/or JEDI-II pursuant to
          Section 2.06 of the Securities Purchase Agreement, and (iii)
          the Indenture Notes (as defined below), the underlying
          Conversion Shares and any replacement or substitute for, or
          reissuance of, any Indenture Notes, until such time as any of
          such securities cease to be Registrable Securities pursuant to
          Section 1.02 hereof. Since the term Registrable Securities is
          being amended to include debt securities as well as equity
          securities, the context of each provision of this Agreement
          will be interpreted in a manner so as to give maximum effect to
          all provisions insofar as they are now applicable to debt
          securities. When calculating a percentage of Registrable
          Securities, the calculation shall be made using the amount of
          shares of Common Stock beneficially owned as a result of owning
          Registrable Securities.

     c.   Demand Registration.  Section 2.01(d) is amended by replacing the last
          -------------------
sentence of the first paragraph with the following:

          Except as provided in this subsection (d) and in Section 2.05,
          the Company will not effect any other registration of its
          Voting Securities (except with respect to Registration
          Statements on Form S-4 or S-8 or any forms succeeding thereto
          for purposes permissible under such forms as of the date hereof
          or filed in connection with an exchange offer or an offering of
          securities solely to the Company's existing stockholders or
          such other registration statements (i) for the resale of shares
          issued pursuant to an employee stock ownership trust or other
          benefit plan of a business acquired in an Acquisition or (ii)
          in connection with non-underwritten resales of securities
          issued to owners of a business acquired in an Acquisition),
          whether for its own account or that of any Other Holder other
          than holders of "Registrable Securities" (as such term is
          defined in the Investor's Rights Agreement) under the
          Investor's Rights Agreement, from the date of receipt of a
          Request Notice requesting the registration of an underwritten
          public offering (x) in the case of all underwritten public
          offerings other than firm commitment, underwritten public
          offerings, until the completion or abandonment of the
          distribution by the underwriter of all securities thereunder,
          or (y) in the case of firm commitment, underwritten public
          offerings, until the earlier of (a) the date each underwriter
          has completed the distribution of all
<PAGE>

                                                             Page 15 of 22 Pages

          securities purchased by it or (b) the date ninety (90) days
          subsequent to the effective date of such registration
          statement.

     d.   Piggy-Back Registration.  Section 2.02 is amended by replacing the
          -----------------------
proviso at the end of the last sentence of the first paragraph with the
following:

          provided, however, that (a) in the case of a Registration
          Statement filed pursuant to the exercise of demand registration
          rights of any Other Holders, priority shall be given first to
          the Other Holders demanding such registration, then equally (on
          a share for share basis) to the Holders and UtiliCorp, then to
          the Company and then to Other Holders (other than the Other
          Holders demanding such registration); and (b) in the case of a
          Registration Statement the filing of which is initiated by the
          Company, priority shall be given (A) first to the Company, then
          (B) such priority shall be given equally (on a share for share
          basis) to (x) the Other Holders (exercising their piggy back
          registration rights) and (y) the Holders.

     e.   Assignees.  Section 3.12 is amended by replacing the first sentence
          ---------
with the following:

          The rights of any Holder under this Agreement may be assigned
          to any Person who, in the aggregate, acquires or becomes the
          Beneficial Owner of at least 10,000 shares of Common Stock
          either issued or issuable on conversion of the Notes, which
          such number shall be subject to equitable adjustment for stock
          splits, stock dividends or combinations of shares.

     f.   Preparations for Registered Sales of Notes.  In the event that any
          ------------------------------------------
Holder or Holders elect to exercise their demand registration rights with
respect to the Notes (the "Triggering Note Holder(s)"), then the following
actions shall be taken:

               (1)  The Triggering Note Holder(s) will notify the Borrower of
          such determination;

               (2)  The Borrower shall (i) promptly notify all other Holders of
          Notes of such determination and (ii) give such other Holders of Notes
          7 days to elect to participate in the following procedures. Any Holder
          of the Notes electing to participate within such 7 days shall
          participate with Triggering Note Holder(s) on a pro-rata basis
          (collectively, the "Participating Note Holder(s)"). Among the
          Participating Note Holder(s), a simple majority on a dollar basis
          shall control all decisions;

               (3)  The Borrower shall engage a nationally recognized indenture
          trustee (the "Trustee") reasonably acceptable to the Participating
          Note Holder(s);

               (4)  The Borrower and the Trustee shall enter into a customary
          indenture (the "Indenture") acceptable to the Participating Note
          Holder(s), which will cover all Notes (the "Indenture Notes"). The
          Indenture shall require the vote of the Participating Note Holder(s)
          holding Indenture Notes representing at least 66 2/3% of the principal
          amount of outstanding Indenture Notes to either (i) amend or modify
          the Indenture or (ii) remove or replace the Trustee; provided,
          however, that, without the consent of each of the Holder(s) of the
          Indenture Notes affected thereby, the Indenture and Indenture Notes
          shall not be amended or modified to (a) extend the fixed maturity of
          any Indenture Note, or reduce the rate or extend the time of payment
          of interest thereon or reduce the principal amount thereof, or
<PAGE>

                                                             Page 16 of 22 Pages

          premium, if any, thereon, or make the principal thereof or premium, if
          any, or interest thereon payable in any currency other than U.S.
          dollars, (b) modify the subordination or conversion provisions of the
          Indenture or Indenture Notes in any manner adverse to the interests of
          the Participating Note Holder(s), or (c) reduce the 66 2/3rd
          percentage for Participating Note Holder(s) who are required to
          consent (i) to other amendments to, or modifications of, the Indenture
          and Indenture Notes or (ii) to removal or replacement of the Trustee.
          The form of Indenture Note will be included within the text of the
          Indenture;

               (5)  The Indenture and the Indenture Notes, both of which must be
          acceptable to the Participating Note Holder(s), shall contain the same
          rights, terms and features, mutatis mutandis, as stated in the
          Securities Agreement, the Registration Agreement and the underlying
          Notes to be received in exchange; including, without limitation, the
          right to convert into Conversion Shares, along with such other terms
          as are required in order (i) for the Indenture Notes to be eligible
          for sale pursuant to a Registration Statement and (ii) for the
          Indenture to be eligible to be qualified under the Trust Indenture Act
          of 1939, as amended (the "Trust Indenture Act"). The terms of any
          provisions of the Securities Agreement, the Registration Agreement and
          the Notes that are (x) to be retained by EMIC and/or JEDI-II and any
          other specific Person and (y) not to be included in the Indenture, may
          be contained in a separate agreement between EMIC and/or JEDI-II (or
          such Person), on the one hand, and the Borrower, on the other hand;

               (6)  As of the date of the Indenture, the face amount of
          underlying Notes of each Holder of a Note shall be exchanged with the
          Borrower and the Trustee for Indenture Notes of an equal face amount.
          Any accrued but unpaid interest on the Notes as of the date of the
          exchange shall be carried forward and shall be payable to the Holders
          of Indenture Notes;

               (7)  The Borrower shall use commercially reasonable efforts to
          cause the creation of the Indenture and the exchange of Notes to be
          accomplished within 30 days after a determination has been made of
          those Participating Note Holders; and

               (8)  When Holder(s) of Indenture Notes exercise their rights to
          sell Indenture Notes pursuant to a Registration Statement, the
          Borrower shall use its commercially reasonable efforts to cause the
          Indenture to be qualified with the Securities and Exchange Commission
          under the Trust Indenture Act.

     g.   Out of Pocket Expenses.  All of the Borrower's and the Participating
          ----------------------
Note Holders' reasonable out of pocket expenses incurred to (a) engage and
compensate a Trustee, (b) create the Indenture, (c) qualify the Indenture under
the Trust Indenture Act, and (d) effect the exchange of Notes for Indenture
Notes shall be paid or reimbursed by the Participating Note Holders, pro rata in
accordance with the face amounts of such Indenture Notes.

     Section 4.  Representations and Warranties.  The Borrower represents that:
                 ------------------------------

                 (i)  as of the date hereof, no Default nor Material Adverse
          Effect has occurred; and

                 (ii) the execution, delivery and performance by the Borrower of
          this First Amendment: (a) is within the Borrower's corporate power;
          (b) has been duly authorized by all necessary or proper corporate
          action; (c) is not in contravention of any provision of the Borrower's
          certificate of incorporation or bylaws; (d) will not violate (1) any
          law or
<PAGE>

                                                             Page 17 of 22 Pages

          regulation or (2) any order or decree of any court or governmental
          instrumentality; (e) will not conflict with or result in the breach or
          termination of, constitute a default under or accelerate any
          performance required by, any agreement or other instrument to which
          the Borrower is a party or by which the Borrower or any of its
          respective property is bound; and (f) does not require the consent or
          approval of any governmental body, agency, authority or any other
          Person that has not been duly obtained, made or complied with prior to
          the date hereof.

     Section 5.  Limitations.  The amendments set forth herein are limited
                 -----------
precisely as written and shall not be deemed to (a) be a consent to, or waiver
or modification of, any other term or condition of the Securities Agreement or
Registration Agreement or any of the other Basic Documents, or (b) prejudice any
right or rights which the Purchasers may now have or may have in the future
under or in connection with the Securities Agreement or Registration Agreement
or any of the other Basic Documents. Except as expressly supplemented, amended
or modified hereby, the terms and provisions of the Securities Agreement or
Registration Agreement or any other Basic Documents are and shall remain in full
force and effect. In the event of a conflict between this First Amendment and
any of the foregoing documents, the terms of this First Amendment shall be
controlling.

     Section 6.  Governance.  This First Amendment and the rights and
                 ----------
obligations of the parties hereunder and under the Securities Agreement shall be
construed in accordance with and be governed by the laws of the State of Texas.
Any action, dispute, claim or controversy of any kind between the Borrower, on
the one hand, and EMIC and JEDI-II or any of their successors and assigns, on
the other hand, shall be arbitrated in accordance with the terms and provisions
of Section 11.08 of the Securities Agreement.

     Section 7.  Descriptive Headings, etc.  The descriptive headings of the
                 --------------------------
several Sections of this First Amendment are inserted for convenience only and
shall not be deemed to affect the meaning or construction of any of the
provisions hereof.

     Section 8.  Counterparts.  This First Amendment may be executed in any
                 ------------
number of counterparts and by different parties on separate counterparts and all
of such counterparts shall together constitute one and the same instrument.
<PAGE>

                                                             Page 18 of 22 Pages

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above.



                         QUANTA SERVICES, INC.,
                         A Delaware corporation


                         By: /s/ Brad Eastman
                            -----------------------------
                         Name: Brad Eastman
                              ---------------------------
                         Title: Vice President
                               --------------------------


                         JOINT ENERGY DEVELOPMENT INVESTMENTS
                         II LIMITED PARTNERSHIP, a Delaware limited
                         partnership

                         By:  Enron Capital Management II Limited
                              Partnership, its General Partner

                              By:  Enron Capital II Corp., its
                                   General Partner


                                   By: /s/ Raymond M. Bowen, Jr.
                                      -------------------------------
                                   Name: Raymond M. Bowen, Jr.
                                        -----------------------------
                                   Title: Vice President and Treasurer
                                         ----------------------------


                         ECT MERCHANT INVESTMENTS CORP.,
                         a Delaware corporation


                         By: /s/ Robert Greer
                            -----------------------------
                         Name: Robert Greer
                              ---------------------------
                         Title: Vice President
                               --------------------------



<PAGE>

                                                             Page 19 of 22 Pages

                               LETTER AGREEMENT
                               ----------------

                              September 21, 1999



ECT Merchant Investments Corp. ("EMIC")
 (as successor to Enron Capital & Trade Resources Corp ("ECT"))
1400 Smith Street
Houston, Texas 77002

Joint Energy Development Investments II Limited Partnership ("JEDI-II")
c/o Enron Corp.
1400 Smith Street
Houston, Texas 77002

Attention: Robert Greer

          Re:  Certain Waivers in connection with transactions between Quanta
               Services, Inc. ("Quanta") and UtiliCorp United Inc. ("UtiliCorp")

Ladies and Gentlemen:

On this date, Quanta and UtiliCorp are entering into a Securities Purchase
Agreement and related transaction documents (collectively, the "Transaction
Documents"), executed copies of which have been provided to EMIC and JEDI-II and
are attached in their final form hereto as Exhibit A. Pursuant to the
Transaction Documents, among other things, (i) UtiliCorp will acquire 1,860,000
shares of Quanta's Series A Convertible Preferred Stock (the "Preferred Stock")
and (ii) UtiliCorp and Quanta will enter into a Management Services Agreement of
even date (the "Management Agreement"). The Preferred Stock is convertible by
the holders thereof (the "Preferred Holder") into Quanta's common stock ("Common
Stock") and pursuant to the Management Agreement, Quanta is obligated to pay to
UtiliCorp certain management fees (collectively, the "Fees").

Quanta and UtiliCorp are jointly requesting that you grant the specific waivers
described below in order for Quanta and UtiliCorp to enter into and perform
certain aspects of the Transaction Documents. The terms of the waivers are set
forth below, and each waiver (i) shall be strictly construed in accordance with
its express terms, (ii) shall be effective only in the specific instance and for
the specific purpose described below and (iii) shall only be effective with
respect to those terms and provisions set forth in the attached Transaction
Documents.
<PAGE>

                                                             Page 20 of 22 Pages

The requested waivers are as follows:

9.   Preemptive Rights.  You waive any and all rights pursuant to Section
     -----------------
     2.06(b) of that certain Securities Purchase Agreement dated September 29,
     1998 among Quanta, JEDI-II and ECT, as amended on this date (the "SPA"),
     solely with respect to (i) Quanta's issuance to UtiliCorp of the Preferred
     Stock and (ii) the Preferred Holder's conversion of the Preferred Stock
     into Common Stock; both such issuance and any such conversions to be done
     strictly in accordance with the terms of the Transaction Documents.

10.  Regularly Scheduled Dividends.  Notwithstanding Section 7.02 of the SPA,
     -----------------------------
     Quanta may pay the Preferred Holder each regularly scheduled dividend (and
     any arrearage with respect to regularly scheduled dividends) provided for
     in Section 2 of the Certificate of Designation, Rights, and Limitations of
     the Preferred Stock included within the Transaction Documents if, but only
     if, at the times of declaration and of payment of any such dividend (and/or
     arrearage with respect to any such dividend), with or without notice or
     lapse of time, or both, no "Default"or "Event of Default" exist, and no
     "Default" or "Event of Default" would result from or would exist
     immediately after any such payment, as "Default" and "Event of Default" are
     defined in the SPA.

11.  Management Fees.  Notwithstanding Section 7.06 of the SPA, Quanta and
     ---------------
     UtiliCorp may enter into the Management Agreement and the other
     transactions contemplated by the Transaction Documents; provided, however,
     that Quanta may pay the regularly scheduled Fee thereunder in accordance
     with the Management Agreement if, but only if, at the time of each payment,
     with or without notice or lapse of time, or both, no Default or Event of
     Default exists and no Default or Event of Default would result from or
     would exist immediately after any such payment of any Fee.

12.  Certain Demand Registrations.  Notwithstanding Section 2.01(d) of the
     ----------------------------
     Registration Rights Agreement dated as of September 29, 1998, as amended on
     this date (the "Rights Agreement"), among Quanta, JEDI-II and ECT, Quanta
     may grant to UtiliCorp the demand registration rights specified in Section
     2.1 of the Investor's Rights Agreement dated of even date herewith between
     Quanta and UtiliCorp (the "Investor's Rights Agreement") included within
     the Transaction Documents; provided, however, that such consent is based on
     the agreement of Quanta and UtiliCorp, which agreement will survive for so
     long as the Purchasers, as such term is defined in the SPA, or their
     successors and assigns hold Registrable Securities as such term is defined
     in the Rights Agreement, that none of the provisions in Article II of the
     Investor's Rights Agreement, including the third party beneficiary rights
     granted to you and your successors, may hereafter be amended, modified,
     expanded or waived without the consent of the Purchasers or their
     successors and assigns; and

13.  Certain Piggy-Back Registrations.  Notwithstanding Section 2.02 of the
     --------------------------------
     Rights Agreement, Quanta may grant to UtiliCorp the piggy-back registration
     rights specified in Section 2.2 of the Investor's Rights Agreement.
<PAGE>

                                                             Page 21 of 22 Pages

The parties hereto expressly acknowledge that the terms of this letter agreement
may be contradictory or in addition to the terms and provisions of the
Transaction Documents and the Rights Agreement and that the terms of this letter
agreement shall control with respect to the subject matter contained herein.
Please acknowledge your consent to this waiver by executing this letter in the
space provided below and returning it to Quanta Services, Inc., 1360 Post Oak
Blvd., Suite 2100, Houston, Texas 77056, attention General Counsel.

                              Very truly yours,

                              QUANTA SERVICES, INC.



                              By: /s/ Brad Eastman
                                 ---------------------------------
                              Name: Brad Eastman
                                   -------------------------------
                              Title: Vice President
                                    ------------------------------


                              UTILICORP UNITED INC.



                              By: /s/ Robert Green
                                 ---------------------------------
                              Name: Robert Green
                                   -------------------------------
                              Title: President
                                    ------------------------------
<PAGE>

                                                             Page 22 of 22 Pages

ACKNOWLEDGED AND ACCEPTED:

ECT MERCHANT INVESTMENTS CORP.



By: /s/ Robert Greer
   ---------------------------
Name: Robert Greer
     -------------------------
Title: Vice President
      ------------------------


JOINT ENERGY DEVELOPMENT INVESTMENTS II
LIMITED PARTNERSHIP

By:  Enron Capital Management II Limited
     Partnership, its General Partner

     By:  Enron Capital II Corp., its
          General Partner



          By: /s/ Raymond M. Bowen, Jr.
             --------------------------------
          Name: Raymond M. Bowen, Jr.
               ------------------------------
          Title: Vice President and Treasurer
                -----------------------------


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