Document:

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                                                                     Exhibit 4.5

                            LYONDELL CHEMICAL COMPANY
                          1999 LONG-TERM INCENTIVE PLAN

               (As Amended and Restated Effective January 1, 2002)

1.    Objectives.  This Lyondell Chemical Company 1999 Incentive Plan (the
      "Plan") is intended to:

   .  Focus Participants on key measures of value creation for the Company's
      shareholders

   .  Provide significant upside and downside award potential commensurate with
      shareholder value creation

   .  Encourage a long-term management perspective and reward for sustained
      long-term performance

   .  Enhance the ability of Lyondell to attract and retain highly talented and
      competent individuals

   .  Reinforce a team orientation among top management

   .  Encourage ownership of the Company's stock among top management

2.    Definitions. The terms set forth below have the following respective
      meanings:

      "Award" means any Option, Performance Share, Restricted Stock, Phantom
Stock, Cash Award or Stock Appreciation Right, granted singly, in combination or
in tandem, and granted to a Participant pursuant to any applicable terms,
conditions and limitations as the Committee may establish to fulfill the Plan
objectives.

      "Award Agreement" means an agreement in the form prescribed by the
Committee that sets forth the terms, conditions and limitations applicable to an
Award.

      "Board" means the Board of Directors of the Company.

      "Cash Award" means an award payable in cash.

      "Code" means the United States Internal Revenue Code of 1986, as amended
from time to time.

      "Common Stock" means the common stock, par value $1.00 per share, of the
Company.

      "Committee" means the Compensation Committee of the Board or any person or
persons appointed by the Board to administer the Plan.

      "Company" means Lyondell Chemical Company.

      "Effective Date" means January 1, 2002, the effective date of the Plan
restatement.

      "Employee" means an individual employed by the Company or a Subsidiary.

      "Exercise Price" means the price at which the Option Shares may be
purchased under the terms of the Award Agreement.

      "Fair Market Value" of a share of Common Stock means, on a particular
date, (i) if shares of Common Stock are listed on a national securities
exchange, the closing price per share of Common Stock reported on the
consolidated transaction reporting system for the principal national securities
exchange listing shares of Common Stock on that date, or, if there has been no
sale reported on that date, on the last preceding date when a sale was

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reported, (ii) if shares of Common Stock are not listed but are quoted on the
NASDAQ National Market, the closing price per share of Common Stock reported by
the NASDAQ National Market on that date, or, if there has been no sale reported
on that date, on the last preceding date when a sale was reported, (iii) if the
Common Stock is neither listed nor quoted, the mean between the closing bid and
asked price on that date, or, if there are no quotations available for that
date, on the last preceding date when quotations are available, as reported by
the NASDAQ Stock Market, or, if not reported by the NASDAQ Stock Market, by the
National Quotation Bureau Incorporated or (iv) if shares of Common Stock are not
publicly traded, the most recent value determined by an independent appraiser
appointed by the Company for that purpose.

      "Grant Date" means the date the Committee grants an Award.

      "Option" means a right to purchase a particular number of shares of
Common Stock at a particular Exercise Price, subject to terms and conditions in
the Plan and Award Agreement.

      "Option Shares" means the shares of Common Stock covered by a particular
Option.

      "Participant" means an Employee to whom an Award has been granted under
this Plan.

      "Performance-Based Award" means an Award that is paid, vested or
otherwise deliverable solely based on achieving one or more Performance Goals,
as provided in Section 6(a).

      "Performance Goal" means a standard established by the Committee to
determine in whole or in part whether Performance-Based Awards are earned.

      "Performance Shares" means the contingent right to receive an amount in
cash or Common Stock, as determined at the Committee's sole discretion, that is
subject to attaining one or more Performance Goals.

      "Phantom Stock" means a right to receive the value of a specified
number of shares of Common Stock.

      "Plan" means the Lyondell Chemical Company 1999 Long-Term Incentive
Plan, as amended from time to time.

      "Restricted Stock" means shares of Common Stock that are restricted or
subject to forfeiture provisions.

      "Stock Appreciation Rights" or "SARs" means the right to receive an
amount in cash or Common Stock, as determined at the Committee's sole
discretion, equal to the appreciation in value of a specified number of shares
of Common Stock over a particular period of time.

      "Subsidiary" means (i) any corporation, limited liability company or
similar entity of which the Company directly or indirectly owns equity interests
representing more than 50% of the voting power of all classes of equity
interests of the entity which have the right to vote generally on matters
submitted to a vote of the equity holders of that entity, (ii) Equistar
Chemicals, LP or LYONDELL-CITGO Refining LP so long as the Company maintains an
equity ownership interest equal to at least 25% in those entities, or (iii) any
other entity in which the Company has an equity ownership interest of at least
25%, so long as the entity is designated by the Committee as a Subsidiary for
Plan purposes; provided, however, for Options intended to qualify as incentive
stock options within the meaning of Code Section 422, "Subsidiary" means a
subsidiary as defined in Code Section 424(f) or any successor provision.

3.    Plan Administration and Designation of Participants.

      (a) Eligibility. All Employees of the Company and its Subsidiaries who,
in the Committee's judgment, are in a position to contribute significantly to
its long-term profit and growth objectives are eligible for Awards under this
Plan. The Committee shall select the Participants from time to time by granting
Awards under the Plan and, subject to the Plan terms and conditions, shall
determine all Award terms and conditions.

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     (b) Administration. The Plan is administered by the Committee, which has
full and exclusive power to interpret this Plan and to adopt rules, regulations
and guidelines to carry out this Plan as it deems necessary or appropriate. The
Committee may delegate its Plan duties to the Company's Chief Executive Officer
or other senior officers subject to the rules and regulations established by the
Committee. The Committee, in its discretion, may retain an outside
administrator's services to perform any of its functions. The Committee, in its
discretion, may extend an Award's exercisability, accelerate an Award's vesting
or exercisability, eliminate or make less restrictive any restrictions contained
in an Award Agreement, waive any Plan or Award Agreement restriction or other
provision or otherwise amend or modify an Award in any manner if (i) the
amendment or modification is not adverse to the Participant holding the Award or
(ii) the Participant consents to the amendment or modification. The Committee
may grant an Award to an individual whom it expects to become an Employee of the
Company or any of its Subsidiaries within the following six months, with the
Award subject to the individual's actually becoming an Employee within that
time, and subject to other terms and conditions the Committee establishes. The
Committee may correct any defect or supply any omission or reconcile any
inconsistency in this Plan or in any Award Agreement in the manner and to the
extent the Committee deems necessary or desirable to further the Plan purposes.
Any Committee decision on Plan interpretation and administration is within its
sole and absolute discretion and shall be final, conclusive and binding on all
parties.

     No Committee member and no Company officer to whom the Committee has
delegated authority according to this Plan shall be liable for anything done or
omitted to be done by him or her while performing any Plan duties, except for
his or her own willful misconduct or as expressly provided by statute.

4.   Award Agreement.  Each Award granted, other than a Cash Award, shall be
described in an Award Agreement, which shall be subject to Plan terms and
conditions. The Committee shall authorize written guidelines to issue a Cash
Award.

5.   Shares of Common Stock Available for Awards.

     (a) Plan Limitations. Subject to Section 11, no Award shall be granted if
it results in the aggregate number of shares of Common Stock issued under the
Plan plus the number of shares of Common Stock covered by or subject to
outstanding Awards (including the Award grant in question) exceeding the lesser
of 14 million or 12% of the number of shares of Common Stock outstanding at the
time the Award is granted. No more than 2,500,000 shares of Common Stock shall
be available for Awards as Performance Shares, Restricted Stock, Stock
Appreciation Rights or Phantom Stock. No more than 1,000,000 shares of Common
Stock shall be available for Incentive Stock Options. The number of shares of
Common Stock that are the subject of Plan Awards that are forfeited or
terminated, expire unexercised, are settled in cash in lieu of Common Stock or
in a manner such that all or some of the shares covered by an Award are not
issued to a Participant or are exchanged for Awards that do not involve Common
Stock, shall again immediately become available for Awards under this Plan.

     (b) Participant Limitations. No Participant may be granted, during the
Plan's term, Options covering or relating to more than 3,000,000 shares of
Common Stock. No Participant may be granted, during the Plan's term, Awards as
Performance Shares, Restricted Stock, Stock Appreciation Rights or Phantom Stock
covering or relating to more than 1,000,000 shares of Common Stock. No
Participant may be granted Cash Awards under this Plan for any calendar year
where the value exceeds $3,000,000.

     (c) Board and Committee Procedures. The Committee, from time to time,
may adopt and observe procedures to count shares against the Plan maximum as it
deems appropriate. The Board and the appropriate Company officers, from time to
time, shall take whatever actions are necessary to file required documents with
governmental authorities, stock exchanges and transaction reporting systems to
ensure that shares of Common Stock are available to be issued according to
Awards.

6.   Types of Awards.

     (a) Performance-Based Awards.  Without limiting the type or number of
Awards that may be made under the other Plan provisions, an Award may be a
Performance-Based Award. Performance-Based Awards are

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Awards that shall be paid, vested or otherwise deliverable solely because one or
more pre-established, objective Performance Goals established by the Committee
is reached prior to the earlier of (x) 90 days after the beginning of the
service period to which the Performance Goal relates or (y) 25% of the service
period lapses (as scheduled in good faith at the time the goal is established),
and in any event while the outcome is substantially uncertain. A Performance
Goal is objective if a third party with knowledge of the relevant facts could
determine whether the goal is met. A Performance Goal may be based on one or
more business criteria that apply to the Employee, to one or more Company
business units, or to the Company as a whole, and may include one or more of the
following: economic value, economic value added, increased revenue, net income,
stock price, market share, earnings per share, return on equity, return on
assets, decrease in costs, shareholder value, net cash flow, total shareholder
return, return on capital, return on investors' capital, operating income, funds
from operations, cash flow, cash from operations, after-tax operating income,
and total market value. Prior to paying any compensation based on achieving
Performance Goals, the Committee must certify in writing that applicable
Performance Goals and any of the material terms were satisfied. It is the Plan's
intent to conform with the standards of Code Section 162(m) and Treasury
Regulation Section 1.162-27(e)(2)(i) in interpreting Plan provisions applicable
to Performance Goals and Performance-Based Awards, and the Committee shall be
guided by these standards when establishing goals and interpreting the Plan. A
Performance-Based Award may include Performance Shares, Options, Restricted
Stock, Stock Appreciation Rights, Cash Awards or Phantom Stock.

     (b) Options. Options granted to Employees may be either incentive stock
options within the meaning of Code Section 422 or nonqualified options within
the meaning of Code Section 83. An Option's Exercise Price shall not be less
than the Fair Market Value of a share of Common Stock on the Option Grant Date
and shall not be less than the Fair Market Value of a share of Common Stock on
the Grant Date of any outstanding Option relinquished to grant a new Option. The
Committee shall determine Option Award terms, conditions and limits.

     (c) Performance Shares. An Award may be made as Performance Shares.
Performance Shares shall be payable, at the Committee's sole discretion, in
cash, shares of Common Stock, or any combination. The Committee shall determine
Performance Share Award terms, conditions and limits.

     (d) Restricted Stock. An Award may be made as shares of Common Stock or
Restricted Stock. The terms, conditions, and limits applicable to any Award of
shares of Common Stock or Restricted Stock under this Plan shall be determined
by the Committee; provided, however, that the Committee shall not award more
than 5% of the number of shares of Common Stock subject to the Plan as
Restricted Stock Awards with a restriction period that provides for full vesting
in less than three years after the date of grant. However, Restricted Stock
Awards may vest earlier, as the Committee deems appropriate, on death,
disability or retirement or an event which constitutes a "Transaction" under
Section 11.

     (e) Phantom Stock. An Award may be made as Phantom Stock, or other
bookkeeping account tied to the value of shares of Common Stock. The Committee
shall determine Phantom Stock Award terms, conditions, and limits.

     (f) Stock Appreciation Rights. An Award may be made as SARs. An SAR's
exercise price shall not be less than the Fair Market Value of a share of Common
Stock on the Grant Date. The Committee shall determine SAR terms, conditions,
and limits.

     (g) Cash Awards. An Award may be made as a Cash Award. The Committee shall
determine Cash Award terms, conditions and limits.

7.   Award Payment.

     (a) General. Payment of Awards may be made as cash or Common Stock or in
combination and may include such restrictions as the Committee determines
including, in the case of Common Stock, restrictions on transfer and forfeiture
provisions.

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     (b) Deferral. The Committee, in its discretion, may (i) permit selected
Participants to defer payments of some or all types of Awards according to
procedures established by the Committee or (ii) provide for Award deferral in an
Award Agreement or otherwise. Any deferral may be made as installment payments
or as a future lump sum payment. Any deferred payment elected by the Participant
or specified by the Award Agreement or by the Committee may be forfeited if and
to the extent provided in the Award Agreement.

     (c) Dividends and Interest. Dividends or dividend equivalent rights may be
extended to and made part of any Award of Common Stock or units of Common Stock,
subject to the terms, conditions and restrictions the Committee establishes. The
Committee may also establish rules and procedures to credit interest on deferred
cash payments and dividend equivalents for deferred payment of Common Stock or
units of Common Stock.

     (d) Substitution of Awards. At the Committee's discretion, a Participant
may be offered an election to substitute an Award for another Award or Awards of
the same or different type.

8.   Stock Option Exercise. The price to purchase shares of Common Stock under
an Option shall be paid in full at exercise in cash or, if the Committee
permits, by tendering Common Stock or surrendering all or part of that or any
other Award, including Restricted Stock, valued at Fair Market Value on the
exercise date, or any combination. The Committee shall determine acceptable
methods to tender Common Stock or Awards to exercise an Option. The Committee
may establish procedures to exercise or purchase Awards by using proceeds from
the sale of Common Stock issuable under an Award. Unless the Award Agreement
provides otherwise, if shares of Restricted Stock are tendered as consideration
for an Option exercise, a number of the shares issued on the Option exercise,
equal to the number of shares of Restricted Stock used as consideration, shall
be subject to the same restrictions as the Restricted Stock submitted as well as
any additional restrictions the Committee imposes.

9.   Termination of Employment. Upon a Participant's employment termination, any
unexercised, deferred or unpaid Awards shall be treated according to the
specific Award Agreement for the Award. Unless the Award Agreement provides
otherwise, each Option Award granted under this Plan shall immediately terminate
to the extent the Option is not vested (or does not become vested as a result of
employment termination) on the date the Participant terminates employment with
the Company or its Subsidiaries.

10.  Assignability. Except as otherwise provided in this Plan, a Participant
shall not sell, transfer, pledge, assign or otherwise alienate or hypothecate an
Award other than by marital property settlement or similar domestic relations
agreement, decree or order, or by will or the laws of descent and distribution.
During the Participant's lifetime, any Award shall be exercisable only by him,
or, if the Participant is mentally incapacitated, the Award shall be exercisable
by his guardian or legal representative. The Committee may prescribe and include
other restrictions on transfer in applicable Award Agreements. Any attempted
assignment or transfer in violation of this Section shall be null and void. At
the Participant's death, the Participant's personal representative or other
person entitled to succeed to his rights (the "Successor Participant") may
exercise these rights. A Successor Participant must furnish proof satisfactory
to the Company of his or her right to exercise the Award under the Participant's
will or applicable descent and distribution laws.

     Subject to approval by the Committee in its sole discretion, all or a
portion of the Awards granted to a Participant under the Plan may be
transferable by the Participant, to the extent and only to the extent specified
in that approval, to (i) the Participant's children or grandchildren ("Immediate
Family Members"), (ii) a trust or trusts for the Immediate Family Members'
exclusive benefit ("Immediate Family Member Trusts"), or (iii) a partnership or
partnerships in which Immediate Family Members have at least ninety-nine percent
(99%) of the equity, profit and loss interests ("Immediate Family Member
Partnerships"), if the Award Agreement under which the Awards are granted (or
any amendment) expressly provides for transfer consistent with this Section.
Subsequent transfers of transferred Awards shall be prohibited except by will or
the laws of descent and distribution, unless transfers are made to the original
Participant or a person to whom the original Participant could have made a
transfer as described above. No transfer shall be effective unless and until the
Committee is provided written notice of the transfer, in the form and manner the
Committee prescribes. Following transfer, Awards shall continue to be subject to
the same terms and conditions which applied immediately prior to transfer, and,
unless otherwise provided, the term "Participant" also refers to the transferee.
The consequences of the Original Participant's employment termination

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continue to apply after the transfer; following employment termination of the
Original Participant, the Awards shall be exercisable by the transferee only to
the extent and for the periods specified in this Plan and the Award Agreement.

11.  Adjustments.

     (a) The existence of outstanding Awards shall not affect, in any manner,
the Company's or its partners' right or power to make or authorize any or all
adjustments, recapitalization, reorganizations or other changes in ownership of
the Company or its business or any Company merger or consolidation, or any
bonds, debentures, preferred or prior preference stock issue or other
obligations (whether or not the issue is prior to, on a parity with or junior to
the Common Stock), or the Company's dissolution or liquidation, or any sale or
transfer of all or any part of its assets or business, or any other Company act
or proceeding of any kind, whether or not similar to the acts or proceedings
described above.

     (b) The Committee shall adjust (i) the number of shares of Common Stock
reserved under this Plan and covered by outstanding Awards and related Incentive
Stock Option award limits; (ii) the Exercise Price for these Awards; and (iii)
the appropriate Fair Market Value and other price determinations for these
Awards on any Common Stock distribution or split, recapitalization,
extraordinary distribution, merger, consolidation, combination or exchange of
shares of Common Stock or similar change or on the occurrence of any other event
that the Committee, in its sole discretion, deems appropriate,

     (c) On a corporate merger, consolidation, acquisition of property or stock,
separation, reorganization or liquidation (hereafter referred to as a
"Transaction"), the Board is authorized (i) to issue or assume Awards by
substituting new Awards, as appropriate, for previously issued Awards or to
assume previously issued Awards as part of the adjustment, (ii) to provide,
prior to the transaction, for the acceleration of the vesting and exercisability
of, or lapse of restrictions with respect to, Awards or (iii) on a Transaction
where the Company is not the surviving corporation, to (A) cancel Options or SAR
Awards and give the Participants who hold these Awards notice and opportunity to
exercise for 30 days prior to cancellation or (B) settle Option or SAR Awards by
a cash payment equal to the difference between the Fair Market Value per share
of Common Stock on the Transaction date and the Award's Exercise Price,
multiplied by the number of shares subject to the Award.

12.  Purchase for Investment. Unless the Awards and shares of Common Stock
covered by this Plan have been registered under the Securities Act of 1933, as
amended, the Company may require each person receiving shares of Common Stock
pursuant to an Award to represent, in writing in form and substance satisfactory
to the Company, that he is acquiring the shares for his own account for
investment and does not intend to sell the shares in connection with their
distribution.

13.  Tax Withholding. The Company shall have the right to deduct applicable
taxes from any Award payment and, on delivery or at vesting of cash or shares of
Common Stock, withhold an appropriate amount of cash or number of shares of
Common Stock or a combination to pay taxes required by law or to take other
action necessary, in the Company's opinion, to satisfy all withholding
obligations for taxes. The Committee may also permit withholding to be satisfied
by transferring shares of Common Stock owned by the Award holder for which
withholding is required to the Company. If shares of Common Stock are used to
satisfy tax withholding, the shares shall be valued based on the Fair Market
Value when the tax withholding is required to be made.

14.  Amendments or Termination. The Committee may amend, alter, or discontinue
the Plan. However, no amendment, alteration or discontinuation, except a Plan
amendment to comply with applicable law, regulations or exchange requirements,
shall impair a Participant's rights under any Award previously granted without
the Participant's consent. No Awards shall be granted more than ten years after
the Effective Date.

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     In addition, no Plan amendment shall be made without approval of the
Company's shareholders (i) if the Committee determines shareholder approval is
required by applicable law, regulations or exchange requirements, or (ii) if the
amendment would result in any of the following applying to more than 5% of the
number of shares of Common Stock subject to the Plan:

     (a) expand the classes of persons to whom Awards may be made under
         Section 3;

     (b) increase the number of shares of Common Stock authorized for grant
         under Section 5;

     (c) increase the number of shares which may be granted under Awards to any
         single Participant under Section 5;

     (d) increase the number of shares available for Restricted Stock Awards;

     (e) allow creation of additional types of Awards;

     (f) allow a shorter restriction period than permitted under Section 6(d);
         or

     (g) materially change the provisions of this paragraph of Section 14.

     The Committee may amend, prospectively or retroactively, the terms of any
Option or other Award granted, but no amendment shall (a) cause a
Performance-Based Award which the Committee intends to qualify for Code Section
162(m) exemption to cease to qualify for that exemption or (b) impair any
Participant's rights without the Participant's consent, except when a Plan or
Award amendment is made to comply with applicable law, regulations or exchange
requirements.

15.  Restrictions. No shares of Common Stock or other payment form shall be
issued under any Award unless the Company is satisfied, based on the advice of
its counsel, that the issuance will comply with applicable federal and state
securities laws. An Award Agreement may include provisions for the Company to
repurchase shares of Common Stock acquired by an Award and to repurchase the
Participant's Option rights.

16.  Unfunded Plan. This Plan shall be unfunded. Although bookkeeping accounts
may be established for Participants who are entitled to cash, shares of Common
Stock or other Plan rights, the accounts shall be used merely as a bookkeeping
convenience. The Company is not required to segregate any assets represented by
cash, shares of Common Stock or other rights, nor shall this Plan be construed
to provide for segregation, nor shall the Company, the Board or the Committee be
deemed to be a trustee of any cash, shares of Common Stock or other rights
granted under this Plan. Any Company liability or obligation to any Participant
for a grant of cash, shares of Common Stock or other rights under this Plan
shall be based solely upon any contractual obligations created by this Plan and
any Award Agreement, and no Company liability or obligation shall be considered
to be secured by any pledge or other encumbrance on Company property. The
Company, the Board, the Committee or a Subsidiary shall not be required to give
any security or bond relating to performing any obligation created by this Plan.

17.  Miscellaneous.  No Award  shall impose any obligation on the Company to
maintain any Participant as an Employee and shall not diminish the Company's
power to discharge any Participant at any time.

18.  Governing Law.  This Plan and all determinations made and actions taken
pursuant to it shall be governed by and construed according to the laws of the
State of Texas, to the extent not otherwise governed by mandatory provisions of
the Code or the United States securities laws.

<PAGE>

19.  Effective Date.  This Plan was originally effective January 1, 1999 and was
originally approved by Company shareholders in May 1999 and was reapproved by
Company shareholders in May 2002. This Plan is amended and restated as of the
Effective Date.

LYONDELL CHEMICAL COMPANY<PAGE>

                                                                    EXHIBIT 10.1

================================================================================

                          SECURITIES PURCHASE AGREEMENT

                                     BETWEEN

                              QUANTA SERVICES, INC.

                                       AND

                           FIRST RESERVE FUND IX, L.P.

                          DATED AS OF OCTOBER 15, 2002

===============================================================================

<PAGE>

                                TABLE OF CONTENTS
                                -----------------

<TABLE>
<CAPTION>
                                                                         Page
<S>                                                                      <C>
ARTICLE I.     DEFINITIONS ...........................................      1

 Section 1.01  Definitions ...........................................      1
 Section 1.02  Accounting Procedures and Interpretation ..............      9

ARTICLE II.    AGREEMENT TO SELL AND PURCHASE ........................      9

 Section 2.01  Authorization of Shares ...............................      9
 Section 2.02  Sale and Purchase .....................................      9
 Section 2.03  Closing ...............................................     10
 Section 2.04  Delivery ..............................................     10
 Section 2.05  Conversion ............................................     10

ARTICLE III.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY .........     10

 Section 3.01  Corporate Existence ...................................     10
 Section 3.02  Company SEC Documents .................................     11
 Section 3.03  No Material Adverse Change ............................     11
 Section 3.04  Litigation ............................................     12
 Section 3.05  No Breach .............................................     12
 Section 3.06  Authority .............................................     13
 Section 3.07  Approvals .............................................     13
 Section 3.08  Employee Benefit Matters ..............................     13
 Section 3.09  Taxes .................................................     13
 Section 3.10  Assets ................................................     14
 Section 3.11  No Material Misstatements .............................     14
 Section 3.12  Investment Company Act ................................     14
 Section 3.13  Public Utility Holding Company Act ....................     14
 Section 3.14  No Violation ..........................................     14
 Section 3.15  Environmental Matters .................................     14
 Section 3.16  Insurance .............................................     15
 Section 3.17  Capitalization ........................................     15
 Section 3.18  Conversion Shares .....................................     16
 Section 3.19  Certain Fees ..........................................     16
 Section 3.20  Licenses ..............................................     17
 Section 3.21  Undisclosed Liabilities ...............................     17
 Section 3.22  Labor Relations .......................................     17
 Section 3.23  State Takeover Statutes ...............................     17
 Section 3.24  Stockholders' Rights Plan .............................     17

ARTICLE IV.    REPRESENTATIONS AND WARRANTIES OF THE PURCHASER .......     18

 Section 4.01  Organization ..........................................     18
 Section 4.02  Authorization of Transaction ..........................     18
 Section 4.03  Noncontravention ......................................     18
 Section 4.04  Litigation ............................................     18
 Section 4.05  Investment ............................................     19
</TABLE>

                                       -i-

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<TABLE>
<S>                                                                        <C>
 Section 4.06  Nature of Purchaser ...................................     19
 Section 4.07  Receipt of Information; Authorization .................     19
 Section 4.08  Anti-Hedging ..........................................     19
 Section 4.09  Restricted Securities .................................     19
 Section 4.10  Certain Fee ...........................................     20
 Section 4.11  No Implied Representations ............................     20

ARTICLE V.     CONDITIONS TO CLOSINGS ................................     20

 Section 5.01  Conditions to the Purchaser's Obligation to Purchase
               the Shares at the Tranche I Closing ...................     20
 Section 5.02  Conditions to the Purchaser's Obligation to Purchase
               Shares at the Tranche II Closing ......................     21
 Section 5.03  Conditions to Obligations of the Company ..............     23

ARTICLE VI.    COVENANTS .............................................     24

 Section 6.01  Financial Statements and Reports ......................     24
 Section 6.02  Maintenance, Etc ......................................     25
 Section 6.03  Further Assurances ....................................     25
 Section 6.04  Efforts; Performance of Obligations ...................     25
 Section 6.05  Shares ................................................     26
 Section 6.06  Insurance .............................................     26
 Section 6.07  Use of Proceeds .......................................     26
 Section 6.08  Notification of Certain Matters .......................     26
 Section 6.09  Nomination of First Reserve Director Designee(s) ......     26
 Section 6.10  Venture Capital Operating Companies ...................     26
 Section 6.11  Covenant Amendments ...................................     26
 Section 6.12  Calling of Stockholders' Meeting ......................     26
 Section 6.13  Fees and Expenses .....................................     27
 Section 6.14  Termination of Certain Covenants ......................     27
 Section 6.15  Grounds for Termination ...............................     27
 Section 6.16  Effect of Termination .................................     27

ARTICLE VII.   MISCELLANEOUS .........................................     28

 Section 7.01  Interpretation and Survival of Provisions .............     28
 Section 7.02  Indemnification, Costs and Expenses ...................     28
 Section 7.03  No Waiver; Modifications in Writing ...................     31
 Section 7.04  Binding Effect; Assignment ............................     31
 Section 7.05  Replacement Securities ................................     32
 Section 7.06  Communications ........................................     32
 Section 7.07  Governing Law; Consent to Jurisdiction ................     33
 Section 7.08  Expenses ..............................................     34
 Section 7.09  Execution in Counterparts .............................     34
 Section 7.10  No Third Party Beneficiaries ..........................     34
</TABLE>

                                      -ii-

<PAGE>

Exhibits:

Exhibit A-1  -  Form of Opinion of Company Counsel
Exhibit A-2  -  Form of Opinion of Winston & Strawn
Exhibit B    -  Certificate of Designation
Exhibit C    -  Investor's Rights Agreement
Exhibit D    -  Aquila Consent

Schedules:

Schedule 3.01   -  Subsidiaries
Schedule 3.03   -  Material Adverse Change
Schedule 3.04   -  Litigation
Schedule 3.05   -  No Breach
Schedule 3.07   -  Approvals
Schedule 3.09   -  Taxes
Schedule 3.15   -  Environmental Matters
Schedule 3.16   -  Insurance
Schedule 3.17   -  Capitalization
Schedule 3.19   -  Fees
Schedule 3.20   -  Licenses
Schedule 3.21   -  Undisclosed Liabilities
Schedule 3.22   -  Labor Relations

                                     -iii-

<PAGE>

                          SECURITIES PURCHASE AGREEMENT

          SECURITIES PURCHASE AGREEMENT, dated as of October 15, 2002 (this
"Agreement"), by and between QUANTA SERVICES, INC., a Delaware corporation (the
"Company"), and FIRST RESERVE FUND IX, L.P., a Delaware limited partnership
("Purchaser").

          In consideration of the mutual covenants and agreements set forth
herein and for good and valuable consideration, the receipt of which is hereby
acknowledged, the parties agree as follows:

                                   ARTICLE I.
                                   DEFINITIONS

          Section 1.01 Definitions. As used in this Agreement, and unless the
context requires a different meaning, the following terms have the meanings
indicated:

          "Action" against a Person means any lawsuit, action, proceeding,
investigation or complaint before any Governmental Authority, mediator or
arbitrator.

          "Affiliate" of any Person means (i) any Person directly or indirectly
controlled by, controlling or under common control with such first Person, (ii)
any director or officer of such first Person or of any Person referred to in
clause (i) above and (iii) if any Person in clause (i) above is an individual,
any member of the immediate family (including parents, spouse and children) of
such individual and any trust whose principal beneficiary is such individual or
one or more members of such immediate family and any Person who is controlled by
any such member or trust. For purposes of this definition, any Person that owns
directly or indirectly 20% or more of the securities having ordinary voting
power for the election of directors or other governing body of a corporation or
20% or more of the partnership or other ownership interests of any other Person
(other than as a limited partner of such other Person) will be deemed to
"control" (including, with its correlative meanings, "controlled by" and "under
common control with") such corporation or other Person.

          "Aquila Consent" means the consent and waiver letter agreement, dated
as of the date hereof, by Aquila, Inc. with respect to the transactions
contemplated hereby, a copy of which is attached as Exhibit D hereto.

          "Aquila Documents" means (i) the Securities Purchase Agreement dated
as of September 29, 1999, between the Company and UtiliCorp United Inc., (ii)
the Settlement and Governance Agreement, dated as of May 20, 2002, between the
Company and Aquila, Inc., (iii) the Amended and Restated Investor's Rights
Agreement, dated as of May 20, 2002, between the Company and Aquila, Inc., (iv)
the Certificate of Designation, Rights and Limitations of Series A Convertible
Preferred Stock of the Company and (v) the Stockholder's Voting Agreement, dated
as of September 21, 1999, between the Company and UtiliCorp United Inc.

          "Aquila Sale" means the sale by Aquila, Inc., a Delaware corporation,
and the purchase by Purchaser at the Tranche I Closing of 3,303,100 shares of
Common Stock and 939,380 shares of the Company's Series A Preferred Stock.

                                      -1-

<PAGE>

          "Average Trading Price" has the meaning specified in Section 2.02(b).

          "Basic Documents" means, collectively, this Agreement, the Investor's
Rights Agreement, the Certificate of Designation and any and all other
agreements or instruments executed and delivered to Purchaser by the Company or
any Subsidiary or Affiliate of the Company on even date herewith or at or prior
to the Tranche II Closing, or any amendments, supplements, continuations or
modifications thereto.

          "Beneficial Ownership," "Beneficial Owner" and "Beneficially Own" have
the meanings ascribed to them in Rule 13d-3 under the Exchange Act in effect on
the date hereof.

          "Board of Directors" means the Board of Directors of the Company.

          "Business Day" means any day other than a Saturday, Sunday, or a legal
holiday for commercial banks in Houston, Texas, or New York, New York.

          "Capital Stock" of any Person means any and all shares, interests,
participations, or other equivalents (however designated) of, or rights,
warrants, or options to purchase, corporate stock or any other equity interest
(however designated) of or in such Person.

          "CERCLA" has the meaning specified in the definition of Environmental
Laws in this Section 1.01.

          "Certificate of Designation" has the meaning specified in Section
2.01.

          "Claims" has the meaning specified in the definition of Environmental
Claims in this Section 1.01.

          "Closing" has the meaning specified in Section 2.04.

          "Closing Date" means, as applicable, the date upon which the Tranche I
Closing or Tranche II Closing occurs as provided in Section 2.03.

          "Code" means the Internal Revenue Code of 1986, as amended from time
to time, and any successor statute.

          "Commission" means the United States Securities and Exchange
Commission.

          "Common Shares" has the meaning specified in Section 2.01.

          "Common Stock" means the common stock, par value $0.00001 per share,
of the Company or such other class of securities as shall, after the date of
this Agreement, constitute the common equity of the Company.

          "Company" has the meaning specified in the introductory paragraph.

          "Company SEC Documents" has the meaning specified in Section 3.02.

                                      -2-

<PAGE>

          "Consolidated Subsidiaries" means each Subsidiary of the Company
(whether now existing or hereafter created or acquired), the financial
statements of which shall be (or should have been) consolidated with the
financial statements of the Company in accordance with GAAP.

          "Conversion Shares" has the meaning specified in Section 2.01.

          "Convertible Loan Documents" means the Subordinated Indenture, dated
as of July 25, 2000 between the Company and Chase Bank of Texas, National
Association as Trustee, and the First Supplemental Indenture, dated as of July
25, 2000, between the Company and Chase Bank of Texas, National Association as
Trustee, and all other documents and instruments executed or delivered in
connection therewith, as the same may be amended or supplemented from time to
time.

          "Delist" or "Delisted" means the delisting of the shares of stock of a
corporation from the exchange such shares are traded on.

          "DGCL" means the Delaware General Corporation Law.

          "Employee Plan" means any employee benefit plan, program or policy
including thrift plans, stock purchase plans, stock bonus plans, stock option
plans, employee stock ownership plans or other incentive or profit sharing
arrangements for the benefit of employees, officers or directors of the Company
or its Affiliates, with respect to which the Company or any ERISA Affiliate may
have any liability or any obligation to contribute, including a Plan or a
Multiemployer Plan.

          "Environmental Claims" means any and all administrative, regulatory or
judicial actions, suits, demands, demand letters, claims, liens, notices of non-
compliance or violations, formal investigations or proceedings relating to any
Environmental Law ("Claims") or any permit issued under any Environmental Law,
including, without limitation, (i) any and all Claims by governmental or
regulatory authorities for enforcement, cleanup, removal, response, remedial or
other actions or damages pursuant to any applicable Environmental Law and (ii)
any and all Claims by any third party seeking damages, contribution,
indemnification, cost recovery, compensation or injunctive relief resulting from
a release or threatened release of Hazardous Materials.

          "Environmental Laws" means any and all Government Requirements
pertaining to the environment in effect in any and all jurisdictions in which
the Company or any Subsidiary is conducting or at any time has conducted
business, or where any Property of the Company or any Subsidiary is located,
including, without limitation, the Oil Pollution Act of 1990 ("OPA"), as
amended, the Clean Air Act, as amended, the Comprehensive Environmental,
Response, Compensation, and Liability Act of 1980 ("CERCLA"), as amended, the
Federal Water Pollution Control Act, as amended, the Occupational Safety and
Health Act of 1970, as amended, the Resource Conservation and Recovery Act of
1976 ("RCRA"), as amended, the Safe Drinking Water Act, as amended, the Toxic
Substances Control Act, as amended, the Superfund Amendments and Reauthorization
Act of 1986, as amended, the Hazardous Materials Transportation Act, as amended,
and other environmental conservation or protection laws. As

                                      -3-

<PAGE>

used in the provisions hereof relating to Environmental Laws, the term "oil" has
the meaning specified in OPA; the terms "hazardous substance" and "release" (or
"threatened release") have the meanings specified in CERCLA, and the terms
"solid waste" and "disposal" (or "disposed") have the meanings specified in
RCRA; provided, however, that (i) in the event either OPA, CERCLA or RCRA is
amended so as to broaden the meaning of any term defined thereby, such broader
meaning shall apply subsequent to the effective date of such amendment, and (ii)
to the extent the laws of the state in which any Property of the Company or any
Subsidiary is located establish a meaning for "oil," "hazardous substance,"
"release," "solid waste" or "disposal" that is broader than that specified in
either OPA, CERCLA or RCRA, such broader meaning shall apply.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and any successor statute.

          "ERISA Affiliate" means each trade or business (whether or not
incorporated) that together with the Company or any Subsidiary of the Company
would be deemed to be a "single employer" within the meaning of Section
4001(b)(1) of ERISA or subsections (b), (c), (m) or (o) of section 414 of the
Code.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended
from time to time, and the rules and regulations of the Commission promulgated
thereunder.

          "Financial Statements" means the financial statement or statements
described or referred to in Section 3.02.

          "GAAP" means generally accepted accounting principles in the United
States of America in effect from time to time.

          "Government Requirement" means any law, statute, code, ordinance,
order, determination, rule, regulation, judgment, decree, injunction, franchise,
permit, certificate, license, authorization or other directive or requirement
(in the case of banking regulatory authorities whether or not having the force
of law), including without limitation, Environmental Laws, energy regulations
and occupational, safety and health standards or controls of any Governmental
Authority.

          "Governmental Authority" includes the country, the state, county, city
and political subdivisions in which any Person or such Person's Property is
located or that exercises valid jurisdiction over any Person or such Person's
Property, and any court, agency, department, commission, board, bureau or
instrumentality of any of them, including monetary authorities, that exercises
valid jurisdiction over any Person or such Person's Property. Unless otherwise
specified, all references to Governmental Authority herein shall mean a
Governmental Authority having jurisdiction over, where applicable, the Company,
the Subsidiaries or any of their Property or Purchaser, any Affiliate of
Purchaser or any of their respective Property.

          "Hazardous Material" shall have the meaning assigned to the term
Hazardous Substance by CERCLA, and shall include any substance defined as
"hazardous" or "toxic" or words used in place thereof under any Environmental
Law applicable to the Company or any of its Subsidiaries.

                                      -4-

<PAGE>

          "HSR Act" has the meaning specified in Section 3.07.

          "Indemnified Party" has the meaning specified in Section 7.02(d).

          "Indemnity Matters" has the meaning specified in Section 7.02(a).

          "Investor's Rights Agreement" means the First Reserve Investor's
Rights Agreement, to be entered into on the Tranche I Closing Date, between the
Company and Purchaser relating to, among other things, the registration of the
Common Shares and Conversion Shares for public distribution.

          "Licenses" has the meaning specified in Section 3.20.

          "Lien" means any interest in Property securing an obligation owed to,
or a claim by, a Person other than the owner of the Property, whether such
interest is based on the common law, statute or contract, and whether such
obligation or claim is fixed or contingent, and including but not limited to the
lien or security interest arising from a mortgage, encumbrance, pledge, security
agreement, conditional sale or trust receipt or a lease, consignment or bailment
for security purposes. The term "Lien" includes reservations, exceptions,
encroachments, easements, rights of way, covenants, conditions, restrictions,
leases and other title exceptions and encumbrances affecting Property. For the
purpose of this Agreement, a Person shall be deemed to be the owner of any
Property that it has acquired or holds subject to a conditional sale agreement,
or leases under a financing lease or other arrangement pursuant to which title
to the Property has been retained by or vested in some other Person in a
transaction intended to create a financing.

          "Material Adverse Effect" means any material and adverse effect on (i)
the assets, liabilities, financial condition, business, operations or affairs of
the Company and its Subsidiaries taken as a whole, (ii) the ability of the
Company and its Subsidiaries taken as a whole to carry out their business as of
the Tranche I Closing Date or as proposed as of the Tranche I Closing Date to be
conducted to meet their obligations under the Basic Documents on a timely basis
or (iii) the ability of the Company to consummate the transactions under this
Agreement and the other Basic Documents.

          "Material Employment Agreement" means any employment agreement filed
as an Exhibit to any of the Company SEC Documents.

          "Multiemployer Plan" means a Plan defined as such in Section 3(37) or
4001(a)(3) of ERISA.

          "Note Holders" means each of the holders from time to time of the
senior secured notes issued by the Company under the Note Purchase Agreement.

          "Note Purchase Agreement" means that certain Note Purchase Agreement
dated as of March 1, 2000, among the Company, as issuer, and the purchasers
listed on "Schedule A" attached thereto, as lenders, and all other documents and
instruments executed or delivered in connection therewith, as the same may be
amended, restated or supplemented from time to time.

                                      -5-

<PAGE>

          "NYSE" has the meaning specified in Section 3.06.

          "Obligations" means any and all amounts, liabilities and obligations
owing from time to time by the Company to Purchaser, 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.

          "OPA" has the meaning specified in the definition of Environmental
Laws in this Section 1.01.

          "Per Preferred Share Purchase Price" has the meaning specified in
Section 2.02.

          "Person" means any individual, corporation, company, voluntary
association, partnership, joint venture, trust, limited liability company,
unincorporated organization or government or any agency, instrumentality or
political subdivision thereof, or any other form of entity.

          "Plan" means any employee pension benefit plan, as defined in Section
3(2) of ERISA, which (i) is currently or hereafter sponsored, maintained or
contributed to by the Company, any Subsidiary or an ERISA Affiliate or (ii) was
at any time during the preceding three calendar years sponsored, maintained or
contributed to, by the Company, any Subsidiary or an ERISA Affiliate.

          "Preferred Shares" has the meaning specified in Section 2.01.

          "Property" means any interest in any kind of property or asset,
whether real, personal or mixed, or tangible or intangible.

          "Purchaser" has the meaning set forth in the introductory paragraph.

          "RCRA" has the meaning specified in the definition of Environmental
Laws in this Section 1.01.

          "Related Parties" has the meaning specified in Section 7.02(a).

          "Responsible Officer" means, as to any Person, the Chief Executive
Officer, the President or any Vice President of such Person and the Chief
Financial Officer of such Person.

          Unless otherwise specified, all references to a Responsible Officer
herein shall mean a Responsible Officer of the Company.

          "Securities" means the Common Shares, the Preferred Shares and, when
issued, the Conversion Shares.

          "Securities Act" means the Securities Act of 1933, as amended from
time to time, and the rules and regulations of the Commission promulgated
thereunder.

                                      -6-

<PAGE>

          "Senior Credit Agreement" means the Third Amended and Restated Credit
Agreement dated as of June 14, 1999, among the Company, the Senior Loan Agent,
and the Senior Lenders, as it may from time to time be amended, modified,
supplemented or increased from time to time, and any Credit Agreement or similar
agreement executed in connection with any refinancing of the Senior Loan.

          "Senior Indebtedness" means all obligations, including the obligation
to pay principal and accrued interest, arising under the Senior Loan Documents.

          "Senior Lenders" means each of the lenders from time to time under the
Senior Credit Agreement.

          "Senior Loan" means, collectively, any advance or advances of
principal made by the Senior Lenders to the Company under the Senior Credit
Agreement and the other Senior Loan Documents and all accrued but unpaid
interest thereon.

          "Senior Loan Agent" means NationsBank, N.A. doing business as Bank of
America, N.A., and any substitute agent, as agent under the Senior Credit
Agreement, and any agent, if any, under any refinancing arrangement of the
Senior Loan.

          "Senior Loan Documents" means the Senior Credit Agreement and all
promissory notes, collateral documents and other agreements, documents and
instruments executed or delivered in connection therewith, as such agreements
may be amended, modified or supplemented from time to time.

          "Series A Preferred Stock" has the meaning specified in Section 3.17.

          "Series E Preferred Stock" means the Series E convertible preferred
stock, par value $0.00001 per share, of the Company to be issued to Purchaser
pursuant to Article II of this Agreement, each share of which is convertible
into ten (10) shares of Common Stock (subject to adjustment pursuant to the
Certificate of Designation).

          "Share Calculation Date" has the meaning specified in Section 3.17.

          "Share Issuance Obligations" has the meaning specified in Section
3.17.

          "Shares" has the meaning specified in Section 2.01.

          "Special Entity" means any joint venture, limited liability company or
partnership, general or limited partnership or any other type of partnership or
company other than a corporation, in which a Person or one or more of its
Subsidiaries is a member, owner, partner or joint venturer and owns, directly or
indirectly, at least a majority of the equity of such entity or controls such
entity, but excluding any tax partnerships that are not classified as
partnerships under state law. For purposes of this definition, any Person that
owns directly or indirectly an equity investment in another Person which allows
the first Person to manage or elect managers who manage the normal activities of
the second Person will be deemed to "control" such second Person (e.g., a sole
general partner controls a limited partnership).

                                      -7-

<PAGE>

          "Standstill Amount", at any time, shall mean the number of shares of
Voting Securities representing 37% of the Voting Securities of the Company, as
such amount may be increased from time to time with the consent of a majority of
the directors of the Company that were not appointed (pursuant to Article VII of
the Investor's Rights Agreement) by, or affiliated with, Investor.

          "Stockholders' Rights Plan" means the Rights Agreement dated March 8,
2000 between the Company and American Stock Transfer and Trust Company, as
amended.

          "Subsidiary" means (i) any corporation of which at least a majority of
the outstanding shares of stock having by the terms thereof ordinary voting
power to elect a majority of the board of directors of such corporation
(irrespective of whether or not at the time stock of any other class or classes
of such corporation might have voting power by reason of the happening of any
contingency) is at the time directly or indirectly owned or controlled by a
Person or one or more of its Subsidiaries or by a Person and one or more of its
Subsidiaries and (ii) any Special Entity. Unless otherwise indicated herein,
each reference to the term "Subsidiary" shall mean a Subsidiary of the Company.

          "Ten Trading Day Period" means (i) if the Tranche II Closing Date
occurs prior to the Company's public announcement (the "Announcement") of its
quarterly earnings for the quarter ended September 30, 2002, the ten (10)
consecutive Trading Days ending on the fifth Trading Day immediately preceding
the Tranche II Closing Date or (ii) if the Tranche II Closing Date occurs after
the Announcement, the ten (10) consecutive trading Days ending on the Trading
Day immediately preceding the Announcement.

          "Trading Day" means any day on which the Company's Common Stock is
traded on the NYSE.

          "Tranche I Closing" has the meaning specified in Section 2.03.

          "Tranche II Closing" has the meaning specified in Section 2.03.

          "Tranche I Closing Date" has the meaning specified in Section 2.03.

          "Tranche II Closing Date" has the meaning specified in Section 2.03.

          "Voting Percentage" means the ratio that the total number of shares of
Voting Securities owned by Purchaser bears to the total number of shares of
Voting Securities outstanding, in each case assuming full conversion of all
outstanding equity securities convertible into Voting Securities (including,
without limitation, the Preferred Shares, whether or not they are then
convertible), calculated at the time of any determination hereunder.

          "Voting Securities" means Common Stock or other capital stock of the
Company entitled generally to vote in the election of directors, the Series A
Preferred Stock and the Preferred Shares (or any equity securities (not
including options, warrants or other similar rights) convertible into securities
so entitled generally to vote in the election of directors (whether or not then
convertible)).

                                      -8-

<PAGE>

          Section 1.02 Accounting Procedures and Interpretation. Unless
otherwise specified herein, all accounting terms used herein shall be
interpreted, all determinations with respect to accounting matters hereunder
shall be made, and all Financial Statements and certificates and reports as to
financial matters required to be furnished to Purchaser hereunder shall be
prepared, in accordance with GAAP applied on a consistent basis during the
periods involved (except as may be indicated in the Certificate of Designation
or, in the case of unaudited statements, as permitted by Form 10-Q promulgated
by the Commission) and in compliance as to form in all material respects with
applicable accounting requirements and with the published rules and regulations
of the Commission with respect thereto.

                                  ARTICLE II.
                         AGREEMENT TO SELL AND PURCHASE

          Section 2.01 Authorization of Shares. On or prior to the Tranche I
Closing, the Company shall have authorized (a) the sale and issuance to
Purchaser of the number of shares of Common Stock set forth in Section 2.02
below (the "Common Shares"), (b) the initial sale and issuance to Purchaser of
the number of shares of Series E Preferred Stock set forth in Section 2.02 below
(the "Preferred Shares", and together with the Common Shares, the "Shares") and
(c) the issuance of shares of Common Stock upon conversion of the Preferred
Shares (the "Conversion Shares"). The Preferred Shares shall have the rights,
preferences, privileges and restrictions set forth in the Certificate of
Designation, Rights, and Limitations of the Series E Preferred Stock of the
Company in the form attached hereto as Exhibit B (the "Certificate of
Designation"). The Common Shares and the Conversion Shares shall have the
rights, preferences, privileges and restrictions set forth in the Company's
Certificate of Incorporation.

          Section 2.02 Sale and Purchase.

               (a)     Subject to the terms and conditions hereof, at the
     Tranche I Closing (as defined in Section 2.03 below) the Company shall
     issue and sell to Purchaser, and Purchaser shall purchase from the Company,
     8,666,666 Common Shares at a price of $3.00 per share.

               (b)     Subject to the terms and conditions hereof, at the
     Tranche II Closing (as defined in Section 2.03 below) the Company shall
     issue and sell to Purchaser, and Purchaser shall purchase from the Company,
     2,430,741 Preferred Shares at a price per share of $30.00 per share, but
     subject to adjustment as hereinafter provided in this Section 2.02(b) (the
     "Per Preferred Share Purchase Price"). In the event that the average of the
     closing prices of the Common Stock as reported on the NYSE on each of the
     ten (10) consecutive Trading Days during the Ten Trading Day Period (the
     "Average Trading Price") shall be greater than $4.00 per share, then the
     Per Preferred Share Purchase Price shall be increased by an amount equal to
     ten times one-half of the amount by which such Average Trading Price is
     greater than $4.00, provided, that such increase shall not exceed $5.00 per
     Preferred Share.

               (c)     Notwithstanding anything in this Section 2.02 to the
     contrary, in no event shall the number of Common Shares or Preferred Shares
     purchased or purchasable pursuant to this Agreement exceed the lesser of
     the Standstill Amount or the amount of

                                      -9-

<PAGE>

     shares the acquisition of which would constitute a change of control (or
     similar concept) under any of the Company's debt instruments.

          Section 2.03 Closing. The delivery of the certificate(s) representing
the Common Shares, payment by Purchaser of the required consideration and all
other instruments required by this Agreement (the "Tranche I Closing") shall
take place at 10:00 a.m. on the date of execution of the Agreement at the
offices of the Company, 1360 Post Oak Boulevard, Suite 2100, Houston, Texas
77056, or at such other time or place as the Company and Purchaser may mutually
agree. The delivery of the certificate(s) representing the Preferred Shares,
payment by Purchaser of the required consideration and all other instruments
required by this Agreement (the "Tranche II Closing") will occur on the second
Trading Day following the satisfaction of the conditions set forth in Sections
5.02 and 5.03 hereof or such other date as is mutually agreed upon by the
parties, but in no event shall such date be later than December 7, 2002.
Notwithstanding the foregoing, Purchaser may postpone the Tranche II Closing for
up to 11 Business Days following any such scheduled Tranche II Closing to the
extent the aggregate consideration to fund the purchase price in respect thereof
exceeds the amount of funds then on hand at Purchaser. The date of the Tranche I
Closing is hereinafter referred to as the "Tranche I Closing Date" and the date
of the Tranche II Closing is hereinafter referred to as the "Tranche II Closing
Date"). Further, it is the intention of the parties hereto that the Tranche I
Closing shall be deemed to have occurred immediately prior to the Aquila Sale.

          Section 2.04 Delivery. At each of the Tranche I Closing and the
Tranche II Closing (as applicable, the "Closing"), subject to the terms and
conditions hereof, the Company will deliver to Purchaser all of the Common
Shares or Preferred Shares, as applicable, by delivery of a certificate or
certificates evidencing the Shares to be purchased at the Closing, free and
clear of any Liens or interests of any other party other than those incurred by
action or inaction of the Purchaser or its Affiliates, and Purchaser will make
payment to the Company of the purchase price therefor by wire transfer of
immediately available funds to an account designated by the Company.

          Section 2.05 Conversion. Purchaser shall have the right, at its
option, to convert shares of Series E Preferred Stock into shares of Common
Stock upon the terms and conditions (including antidilution adjustments) as more
fully specified in the Certificate of Designation.

                                  ARTICLE III.
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          The Company represents and warrants to Purchaser, which
representations and warranties shall survive the Tranche II Closing for a period
of two years, as follows:

          Section 3.01 Corporate Existence. The Company: (i) is a corporation
duly incorporated, legally existing and in good standing under the laws of the
State of Delaware; (ii) has all requisite power, and has all material
governmental licenses, authorizations, consents and approvals necessary to own
its assets and carry on its business as its business is now being or as its
business is proposed to be conducted, except where the failure to have all such
material governmental licenses, authorizations, consents and approvals would not
have a Material Adverse Effect; and (iii) is qualified to do business in all
jurisdictions in which the nature of the

                                      -10-

<PAGE>

business conducted by it makes such qualifications necessary and where failure
so to qualify would have a Material Adverse Effect. Neither the Company nor any
of its Subsidiaries is in default in the performance, observance or fulfillment
of any provision of, in the case of the Company, its Certificate of
Incorporation, as amended and restated, or Bylaws, or, in the case of any
Subsidiary, its Certificate of Incorporation, Bylaws or other organizational
documents. Schedule 3.01 identifies each Subsidiary of the Company and the
ownership of all outstanding Capital Stock of each such Subsidiary. Each of the
Company's Subsidiaries that is a corporation is a corporation duly organized,
validly existing and in good standing under the laws of the State or other
jurisdiction of its incorporation and has all requisite power, and has all
material governmental licenses, authorizations, consents and approvals necessary
to own its assets and carry on its business as now being or as proposed to be
conducted, except where the failure to have all such material governmental
licenses, authorizations, consents and approvals would not have a Material
Adverse Effect. Each of the Company and each of its Subsidiaries that is a
corporation is duly qualified or licensed and in good standing as a foreign
corporation, and is authorized to do business, in each jurisdiction in which the
ownership or leasing of its respective properties or the character of its
respective operations makes such qualification necessary, except where the
failure to obtain such qualification, license, authorization or good standing
would not have a Material Adverse Effect. Each Subsidiary of the Company that is
not a corporation has been duly formed and is duly qualified or licensed and
authorized to do business in each jurisdiction in which the ownership or leasing
of its respective properties or the character of its respective operations makes
such qualification necessary, except where the failure to obtain such
qualification, license or authorization would not have a Material Adverse
Effect.

         Section 3.02 Company SEC Documents. The Company has timely filed with
the Commission all forms, registrations and proxy statements, reports, schedules
and statements required to be filed by it since December 31, 2000, under the
Exchange Act or the Securities Act (all documents filed since such date,
collectively "Company SEC Documents"). The Company SEC Documents, including,
without limitation, any financial statements or schedules included therein, at
the time filed (in the case of registration statements and proxy statements,
solely on the dates of effectiveness and the dates of mailing, respectively)
(except to the extent corrected by a subsequently filed Company SEC Document
filed prior to the Tranche I Closing Date) (i) did not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading, and (ii) complied in
all material respects with the applicable requirements of the Exchange Act and
the Securities Act, as the case may be, (iii) complied as to form in all
material respects with applicable accounting requirements and with the published
rules and regulations of the Commission with respect thereto, were prepared in
accordance with GAAP applied on a consistent basis during the periods involved
(except as may be indicated in the notes thereto or, in the case of unaudited
statements, as permitted by Form 10-Q of the Commission), and (iv) fairly
present (subject in the case of unaudited statements to normal, recurring and
year-end audit adjustments) in all material respects the consolidated financial
position of the Company as at the dates thereof and the consolidated results of
its operations and cash flows for the periods then ended.

         Section 3.03 No Material Adverse Change. Except as set forth in or
contemplated by the Company SEC Documents filed with the Commission as of the
date hereof or in Schedule 3.03, since June 30, 2002, each of the Company and
its Subsidiaries has

                                      -11-

<PAGE>

conducted its business in the ordinary course, consistent with past practice,
and there has been no (i) change that could reasonably be expected to have a
Material Adverse Effect, other than those occurring as a result of general
economic or financial conditions or other developments which are not unique to
the Company and its Subsidiaries but also affect similarly other Persons who
participate or are engaged in the lines of business of which the Company and its
Subsidiaries participate or are engaged, (ii) Material Adverse Effect, (iii)
declaration, setting aside or payment of any dividend or other distribution with
respect to the Company's Capital Stock, (iv) acquisition or disposition of any
material asset by the Company or any of its Subsidiaries or any contract or
arrangement therefore, otherwise than for fair value in the ordinary course of
business or as disclosed in the Company SEC Documents, or (v) material change in
the Company's accounting principles, practices or methods.

         Section 3.04 Litigation. Except as set forth in the Company SEC
Documents or as disclosed to Purchaser in Schedule 3.04, there is no Action
pending or, to the knowledge of the Company, contemplated or threatened against
or affecting the Company, any of its Subsidiaries or any of their respective
officers, directors, properties or assets, which relates to or challenges the
legality, validity or enforceability of this Agreement, any of the Basic
Documents or any other documents or agreements executed or to be executed by the
Company pursuant hereto or thereto or in connection herewith or therewith, or
which (individually or in the aggregate) reasonably could be expected to have a
Material Adverse Effect.

         Section 3.05 No Breach. The execution, delivery and performance by the
Company of this Agreement, the Basic Documents and all other agreements and
instruments to be executed and delivered by the Company pursuant hereto or
thereto or in connection herewith or therewith, compliance by the Company with
the terms and provisions hereof and thereof, the issuance of the Shares and
(when issued) the Conversion Shares by the Company, the consummation by the
Company of the transaction contemplated hereby or thereby and the application of
the proceeds thereof in compliance herewith do not and will not (a) violate any
provision of any law, statute, rule or regulation, order, writ, judgment,
injunction, decree, governmental permit, determination or award or other
Government Requirement having applicability to the Company or any of its
Subsidiaries or any of their respective properties or assets, (b) conflict with
or result in a violation of any provision of the charter or bylaws of the
Company or its Subsidiaries, (c) require any consent (other than consents set
forth on Schedule 3.05), approval or notice under or result in a violation or
breach of or constitute (with or without due notice or lapse of time or both) a
default (or give rise to any right of termination, cancellation or acceleration
or constitute a change of control (or similar concept)) under (i) any note,
bond, mortgage, license, or loan or credit agreement to which the Company or any
of its Subsidiaries is a party or by which the Company or any of its
Subsidiaries or any of their respective properties may be bound or (ii) any
other contract, agreement, instrument or obligation, (d) result in or require
the creation or imposition of any Lien upon or with respect to any of the
properties now owned or hereafter acquired by the Company or any of its
Subsidiaries or (e) give rise to any anti-dilution or similar adjustment, or any
preemptive rights, in respect of any Capital Stock of the Company; with the
exception of the conflicts stated (x) in clause (b) of this Section 3.05, (y) in
clause (c) of this Section 3.05 (but, in the case of such clause (c), only in
respect of the Senior Loan Documents, the Note Purchase Agreement, the
Convertible Loan Documents, the Aquila Documents and any Material Employment
Agreement) and (z) in clause (e) of this Section 3.05, except where such
conflict, violation, default, breach, termination,

                                      -12-

<PAGE>

cancellation, failure to receive consent or approval, or acceleration with
respect to the foregoing provisions of this Section 3.05 would not, individually
or in the aggregate, reasonably be likely to have a Material Adverse Effect.

         Section 3.06 Authority. The Company has all necessary power and
authority to execute, deliver and perform its obligations under the Basic
Documents to which it is a party; and the execution, delivery and performance by
the Company of the Basic Documents to which it is a party, have been duly
authorized by all necessary action on its part; and the Basic Documents
constitute the legal, valid and binding obligations of the Company, enforceable
in accordance with their terms, except as such enforceability may be limited by
bankruptcy, insolvency, fraudulent transfer and similar laws affecting
creditors' rights generally or by general principles of equity. No approval from
the stockholders of the Company is required as a result of the Company's
issuance of the Shares or the Conversion Shares or the listing of the Common
Shares or the Conversion Shares with the New York Stock Exchange (the "NYSE"),
except that the affirmative vote of at least a majority of the votes cast by the
holders of Common Stock (with the Series A Preferred Stock being voted on an as
converted basis), provided that the total votes cast represent a majority of
shares entitled to vote (the "Required Stockholder Vote"), is required under the
NYSE rules to approve the issuance of the Conversion Shares.

         Section 3.07 Approvals. Except as set forth in Schedule 3.07, no
authorization, consent, approval, waiver, license, qualification or written
exemption from, nor any filing, declaration, qualification or registration with,
any Governmental Authority or any other Person that has not been made or
obtained and is required in connection with the execution, delivery or
performance by the Company of this Agreement or any of the Basic Documents or
the issuance by the Company of the Shares or the Conversion Shares, except (i)
with respect to the Tranche II Closing, consents and approvals under the
applicable requirements of the Hart-Scott Rodino Antitrust Improvements Act of
1976, as amended (the "HSR Act"), (ii) with respect to the Conversion Shares,
the receipt of the Required Stockholder Vote and (iii) where the failure to
receive such authorization, consent, approval, waiver, license, qualification or
written exemption from, or to make such filing, declaration, qualification or
registration would not, individually or in the aggregate, reasonably be likely
to have a Material Adverse Effect.

         Section 3.08 Employee Benefit Matters. The Company and its Subsidiaries
and each ERISA Affiliate are in compliance in all material respects with all
applicable provisions of ERISA or the Code and published interpretations
thereunder with respect to all Employee Plans which are subject to ERISA or the
Code, except where the failure to be in compliance would not reasonably be
likely to have a Material Adverse Effect. No breach or violation of or default
by the Company or any ERISA Affiliate under any Employee Plan has occurred which
is reasonably likely to have a Material Adverse Effect.

         Section 3.09 Taxes. Except as set forth in Schedule 3.09, the Company
and each of its Subsidiaries have timely and properly prepared and filed all
necessary federal, state, local and foreign tax returns with respect to the
Company and its Subsidiaries that are required to be filed (taking into
consideration any extension periods) and have paid when due all taxes shown to
be due thereon and have paid, or made adequate provision (in accordance with
GAAP) for the payment of, all other taxes and assessments with respect to the
Company and its Subsidiaries to the extent that the same shall have become due
(taking into consideration any

                                      -13-

<PAGE>

extension periods), except where the failure to file such returns or to pay, or
make provision for the payment of, such taxes and assessments would not have a
Material Adverse Effect on the Company and its Subsidiaries, taken as a whole.
Except as set forth in Schedule 3.09, the Company has no knowledge of any tax
deficiency that has been asserted against the Company or any Subsidiary which
the Company reasonably expects to have a Material Adverse Effect.

         Section 3.10  Assets. Neither the Company nor any of its Affiliates is
a party to any contract, agreement, arrangement or understanding (other than
this Agreement and the agreements entered into hereunder) that by its terms
purports to obligate, restrict or otherwise bind Purchaser (as Affiliates of the
Company or otherwise) including any area of mutual interest, exclusivity, non-
competition or other similar agreement.

         Section 3.11  No Material Misstatements. None of the representations or
warranties made by the Company herein or in any Schedule hereto, or certificate
furnished by the Company pursuant to this Agreement, when all such documents are
read together in their entirety, contains any untrue statement of a material
fact, or omits to state any material fact necessary to make the statements
contained herein or therein, in light of the circumstances under which made, not
misleading.

         Section 3.12  Investment Company Act. Neither the Company nor any
Subsidiary is an "investment company" or a company "controlled" by an
"investment company," within the meaning of the Investment Company Act of 1940,
as amended.

         Section 3.13  Public Utility Holding Company Act. Neither the Company
nor any Subsidiary is a "holding company," or a "subsidiary company" of a
"holding company," or an "affiliate" of a "holding company" or of a "subsidiary
company" of a "holding company," or a "public utility" within the meaning of the
Public Utility Holding Company Act of 1935, as amended.

         Section 3.14  No Violation. Neither the Company nor any of its
Subsidiaries is (a) in default (nor has an event occurred which, with notice or
passage of time or both, would constitute such a default) under or in violation
of any provision of (i) any loan or credit agreement (including the Senior Loan
Documents, the Note Purchase Agreement and the Convertible Loan Documents), (ii)
any Aquila Documents or (iii) any other agreement or instrument to which it is a
party or by which it or any of its properties may be bound, (b) a party to any
order of any Governmental Authority arising out of any Action, which such
violation, default or action in clauses (a)(iii) or (b) could reasonably be
expected to have a Material Adverse Effect, (c) in violation of any statute,
rule or regulation of any Governmental Authority or any governmental permit,
which violation could reasonably be expected to (individually or in the
aggregate) (x) affect the legality, validity or enforceability by Purchaser of
this Agreement or any of the Basic Documents or (y) have a Material Adverse
Effect.

         Section 3.15  Environmental Matters.

                 (a)   Environmental Laws. The Company and its Subsidiaries have
     complied with, and will be in compliance with, all applicable Environmental
     Laws and the requirements of any permits issued under such Environmental
     Laws except where

                                      -14-

<PAGE>

     failure to so comply could not reasonably be expected to have a Material
     Adverse Effect. Except as set forth in Schedule 3.15, to the knowledge of
     the Company, there are no pending, past or threatened Environmental Claims
     against the Company or any of its Subsidiaries or any Property owned or
     operated by the Company or any of its Subsidiaries which could reasonably
     be expected to have a Material Adverse Effect. Except as set forth on
     Schedule 3.15, to the knowledge of the Company, there are no conditions or
     occurrences on or emanating from any Property owned or operated by the
     Company or any of its Subsidiaries or on any property adjoining or in the
     vicinity of any such Property that could reasonably be expected (i) to form
     the basis of an Environmental Claim against the Company or any of its
     Subsidiaries or any Property owned or operated by the Company or any of its
     Subsidiaries or (ii) to cause any Property owned or operated by the Company
     or any of its Subsidiaries to be subject to any material restrictions on
     the ownership, occupancy, the current or intended use or transferability of
     such Property by the Company or any of its Subsidiaries under any
     applicable Environmental Law, except for any such condition or occurrence
     described in clauses (i) or (ii) which could not reasonably be expected to
     have a Material Adverse Effect.

              (b)      Hazardous Materials. Except as set forth on Schedule
     3.15, to the knowledge of the Company (i) Hazardous Materials have not at
     any time been generated, used, treated or stored on, or transported to or
     from, any property owned or operated by the Company or any of its
     Subsidiaries in a manner that has violated or could reasonably be expected
     to violate any Environmental Law, except for such violation which could not
     reasonably be expected to have a Material Adverse Effect, and (ii)
     Hazardous Materials have not at any time been released on or from any
     property owned or operated by the Company or any of its Subsidiaries in a
     manner that has violated or could reasonably be expected to violate any
     Environmental Law, except for such violation which could not reasonably be
     expected to have a Material Adverse Effect.

         Section 3.16  Insurance. Except as set forth in Schedule 3.16, the
Company and its Subsidiaries (for such time period after an entity became a
Subsidiary of the Company) have policies of property and casualty insurance and
bonds of the type and in amounts customarily carried by persons conducting
business or owning assets similar to those of the Company and its Subsidiaries.
There is no material claim pending under any of such policies or bonds as to
which coverage has been, nor any basis for the Company to reasonably believe
that a material claim will be, questioned, denied or disputed by the
underwriters of such policies or bonds. All premiums due and payable under all
such policies and bonds have been paid and the Company and its Subsidiaries are
otherwise in compliance with the terms of such policies and bonds. Except as set
forth in Schedule 3.16, the Company has no knowledge of, since December 31,
2001, any threatened termination of, or material premium increase with respect
to, any of such policies. Schedule 3.16 identifies all risks, if any, of the
Company or any of its Subsidiaries that are self-insured and might have a
Material Adverse Effect.

         Section 3.17  Capitalization. The authorized Capital Stock of the
Company consists of (a) 300,000,000 shares of Common Stock, par value $0.00001
per share, 59,799,848 shares are issued and outstanding as of the end of the day
immediately preceding the Tranche I Closing Date (the "Share Calculation Date")
and 926,371 shares of Common Stock are held in treasury; (b) 3,345,333 shares of
Limited Vote Common Stock, par value $0.00001 per share, of

                                      -15-

<PAGE>

which 1,083,750 shares are issued and outstanding as of the Share Calculation
Date; and (c) 10,000,000 shares of preferred stock, par value $0.00001 per
share, of which (x) 3,444,961 shares have been designated Series A convertible
preferred stock, par value $0.0001 per share (the "Series A Preferred Stock"),
of which all 3,444,961 shares are issued and outstanding as of the Share
Calculation Date, which shares are convertible into 17,224,805 shares of Common
Stock (which number of shares (assuming delivery of the Aquila Consent) will not
be subject to adjustment as a result of the transactions contemplated by this
Agreement), (y) 1,000,000 shares have been designated Series B junior
participating preferred stock, par value $0.00001 per share (the "Series B
Preferred Stock"), of which no shares are issued and outstanding as of the Share
Calculation Date, and (z) 1,000,000 shares have been designated Series C junior
convertible preferred stock, par value $0.00001 per share (the "Series C
Preferred Stock"), of which no shares are issued and outstanding as of the Share
Calculation Date; provided, that as of the Tranche II Closing Date, no shares of
the Series B Preferred Stock or Series C Preferred Stock will be designated,
issued or outstanding, 1,000,000 shares will be designated Series D junior
participating preferred stock, par value $0.00001 per share, of which no shares
will be issued and outstanding, and 3,918,209 shares will be designated Series E
Preferred Stock of which, immediately prior to the Tranche II Closing, no shares
will be issued and outstanding. All outstanding shares of Common Stock, Limited
Vote Common Stock and Series A Preferred Stock are validly issued, fully paid
and nonassessable and were issued free of preemptive rights. Except as set forth
on Schedule 3.17, the Company is not a party to any voting trust or other
agreement with respect to the voting of its Capital Stock. Except as set forth
in Schedule 3.17, there are as of the Share Calculation Date no (i) outstanding
securities convertible into or exchangeable for Capital Stock of the Company or
(ii) contracts, commitments, agreements, understandings or arrangements of any
kind to which the Company is a party obligating the Company under any
circumstance to issue any Capital Stock (including by virtue of anti-dilution
provisions of any Capital Stock), or any securities convertible into or
exchangeable for or rights to purchase or subscribe for Capital Stock of the
Company, other than this Agreement (the "Share Issuance Obligations"). Schedule
3.17 reasonably sets forth information regarding the Share Issuance Obligations.
Except as set forth on Schedule 3.17 neither the Company nor any of its
Subsidiaries is a party to or bound by any agreement with respect to any of its
securities that grants registration rights to any Person.

         Section 3.18 Conversion Shares. The Conversion Shares, when issued and
delivered in accordance with the terms of the Certificate of Designation, will
be duly and validly issued, fully paid, non-assessable, free of preemptive
rights of other stockholders and free from all Liens (except any Liens created
or suffered to be created by Purchaser or its Affiliates) and will not be
subject to any restriction on the voting or transfer thereof created by the
Company, other than the restrictions set forth in Section 4.05 of this Agreement
and pursuant to the Investor's Rights Agreement. The Company has duly and
validly reserved the Conversion Shares for issuance upon conversion of the
Shares.

         Section 3.19 Certain Fees. Except for the fees payable to Goldman,
Sachs & Co. described on Schedule 3.19 attached hereto, no fees or commissions
will be payable by the Company to brokers, finders, investment bankers, or
Purchaser with respect to the issuance and sale of any of the Shares or the
consummation of the transactions contemplated by this Agreement. The Company
agrees that it will indemnify and hold harmless Purchaser from and against any
and all claims, demands, or liabilities for broker's, finders, placement, or
other

                                      -16-

<PAGE>

similar fees or commissions incurred by the Company or alleged to have been
incurred by the Company in connection with the issuance or sale of the Shares or
the consummation of the transaction contemplated by this Agreement.

         Section 3.20 Licenses. Except as set forth in Schedule 3.20, each of
the Company and its Subsidiaries holds all licenses, franchises, permits,
consents, registrations, certificates and other approvals (including, without
limitation, those relating to environmental matters and worker health and
safety) (individually, a "License" and, collectively, "Licenses") required for
the conduct of its business as now being conducted, except where the failure to
hold any such License would not have a Material Adverse Effect.

         Section 3.21 Undisclosed Liabilities. Except (a) as and to the extent
disclosed or reserved against on the consolidated balance sheet of the Company
as of June 30, 2002 or the notes thereto included in the Company SEC Documents
or otherwise disclosed in the Company SEC Documents filed with the Commission as
of the date hereof (b) those incurred in connection with the execution of the
Basic Documents (c) obligations incurred in the ordinary course of business
subsequent to June 30, 2002 or (d) as set forth in Schedule 3.21, neither the
Company nor any of its subsidiaries have any liabilities or obligations of any
nature, whether known or unknown, absolute, accrued, contingent or otherwise and
whether due or to become due, and that would be required by GAAP to be disclosed
and that, individually or in the aggregate, have or would reasonably be expected
to have a Material Adverse Effect.

         Section 3.22 Labor Relations. Except as disclosed on Schedule 3.22,
there is no unfair labor practice litigation involving the Company or any of its
subsidiaries either pending before the National Labor Relations Board or a court
or, to the knowledge of the Company, threatened against the Company or any of
its subsidiaries. Except as disclosed on Schedule 3.22, there is no labor
strike, dispute, slowdown or stoppage, either pending or, to the knowledge of
the Company, threatened against the Company or any of its subsidiaries, nor has
the Company experienced any such labor interruptions over the past two years.
The Company considers its relationship with its employees to be good.

         Section 3.23 State Takeover Statutes. The Board of Directors of the
Company has taken all action necessary to render inapplicable to the issuance of
Shares and Conversion Shares to Purchaser and the transactions contemplated
hereby (including the Aquila Sale) the provisions of Section 203 of the DGCL. No
other state takeover statute or similar statute or regulation applies or
purports to apply to the issuance of Shares and Conversion Shares to Purchaser
and the transactions contemplated hereby (including the Aquila Sale).

         Section 3.24 Stockholders' Rights Plan. The Company and the Board of
Directors have taken all necessary action to render the Stockholders' Rights
Plan inapplicable to the issuance of Common Shares, Preferred Shares (including
shares issuable as pay-in-kind dividends) and Conversion Shares, the sale of
shares pursuant to the Aquila Sale and any other sales or issuances in
accordance with the Basic Documents and neither the execution of this Agreement
nor the consummation of any of the transactions contemplated hereby will result
in the Purchaser becoming an "Acquiring Person" or will result in a "Triggering
Event," "Distribution Date," "Flip-In Event," or "Share Acquisition Date" (as
such terms are defined in the Stockholders' Rights Plan).

                                      -17-

<PAGE>

                                  ARTICLE IV.
                 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

         Purchaser represents and warrants to the Company, which representations
and warranties shall survive the execution of any Basic Document, that as of the
date of this Agreement:

         Section 4.01 Organization. The Purchaser is a limited partnership duly
organized, validly existing and in good standing under the laws of the State of
Delaware.

         Section 4.02 Authorization of Transaction. The Purchaser has all
requisite partnership power and authority to execute and deliver this Agreement
and to perform its obligations hereunder. The execution and delivery by the
Purchaser of this Agreement and the consummation by the Purchaser of the
transactions contemplated hereby have been validly authorized by all necessary
partnership action on the part of the Purchaser. This Agreement has been validly
executed and delivered by the Purchaser and, assuming this Agreement constitutes
the valid and binding obligation of the Company, constitutes valid and binding
obligation of the Purchaser, enforceable against the Purchaser in accordance
with its terms, except as enforceability may be limited by bankruptcy,
insolvency, reorganization, fraudulent transfer, moratorium or other similar
laws relating to or affecting the rights of creditors generally and by equitable
principles, including those limiting the availability of specific performance,
injunctive relief and other equitable remedies and those providing for equitable
defenses.

         Section 4.03 Noncontravention. Neither the execution and delivery by
the Purchaser of this Agreement, nor the consummation by the Purchaser of the
transactions contemplated hereby, will: (a) conflict with or violate any
provision of the partnership agreement of the Purchaser; (b) require on the part
of the Purchaser any filing with, or permit, authorization, consent or approval
of, any Governmental Entity, except (i) with respect to the Tranche II Closing,
consents and approvals under the HSR Act, and (ii) for any filing, permit,
authorization, consent or approval which if not obtained or made would not
reasonably be expected to result in a material adverse effect on the ability of
the Purchaser to consummate the transactions contemplated by this Agreement (a
"Purchaser Material Adverse Effect"); (c) conflict with, result in a breach of,
constitute (with or without due notice or lapse of time or both) a default
under, result in the acceleration of, create in any party any right to terminate
or modify, or require any notice, consent or waiver under, any contract or
agreement to which the Purchaser is a party or by which the Purchaser is bound,
except for (i) any conflict, breach, default, acceleration or right to terminate
or modify that would not reasonably be expected to result in a Purchaser
Material Adverse Effect or (ii) any notice, consent or waiver the absence of
which would not reasonably be expected to result in a Material Adverse Effect;
or (d) violate any order, writ, injunction or decree specifically naming, or
statute, rule or regulation applicable to, the Purchaser or any of its
properties or assets, except for any violation that would not reasonably be
expected to result in a Purchaser Material Adverse Effect.

         Section 4.04 Litigation. There are no actions, suits, claims or legal,
administrative or arbitratorial proceedings pending against, or, to the
Purchaser's knowledge, threatened against the Purchaser which would adversely
affect the Purchaser's performance under this Agreement or the consummation of
the transactions contemplated by this Agreement.

                                      -18-

<PAGE>

         Section 4.05 Investment. Purchaser represents and warrants to, and
covenants and agrees with, the Company that the Shares are being acquired for
its own account, not as a nominee or agent, and with no intention of
distributing or reselling the Shares or the Conversion Shares or any part
thereof and that Purchaser has no present intention of selling or granting any
participation in or otherwise distributing the same in any transaction that
would be in violation of the securities laws of the United States of America or
any State, without prejudice, however, to Purchaser's right at all times to sell
or otherwise dispose of all or any part of the Shares or the Conversion Shares
under a registration statement under the Securities Act and applicable state
securities laws or under an exemption from such registration available
thereunder (including, without limitation, if available, Rule 144 promulgated
thereunder). If Purchaser should in the future decide to dispose of any of the
Shares or the Conversion Shares, Purchaser understands and agrees (a) that it
may do so only (i) in compliance with the Securities Act and applicable state
securities law, as then in effect, and (ii) in the manner contemplated by any
registration statement pursuant to which such securities are being offered, and
(b) that stop-transfer instructions to that effect will be in effect with
respect to such securities. Purchaser agrees to the imprinting, so long as
appropriate, of a legend on each certificate representing the Securities to the
effect as set forth above.

         Section 4.06 Nature of Purchaser. Purchaser represents and warrants to,
and covenants and agrees with, the Company that, (a) it is an "accredited
investor" within the meaning of Rule 501 of Regulation D promulgated by the
Securities and Exchange Commission pursuant to the Securities Act and (b) by
reason of its business and financial experience it has such knowledge,
sophistication and experience in business and financial matters so as to be
capable of evaluating the merits and risks of the prospective investment in the
Securities, is able to bear the economic risk of such investment and, at the
present time, would be able to afford a complete loss of such investment.

         Section 4.07 Receipt of Information; Authorization. Purchaser
acknowledges that it has had access to information regarding the business,
assets, operations, financial condition and results of operations of the Company
and has been provided a reasonable opportunity to ask questions of and receive
answers from representatives of the Company regarding such matters. Purchaser
acknowledges that it has signed a Confidentiality Agreement with the Company,
and it hereby re-affirms its obligation under such agreement. Purchaser further
acknowledges that it is experienced in investing in corporations and businesses.
Purchaser represents and warrants that the purchase of the Shares by it has been
duly and properly authorized and this Agreement and each other Basic Document to
which Purchaser is (or will at the Tranche II Closing be) a signatory have been
(or, with respect to the other Basic Documents, at the Tranche II Closing will
be) duly executed and delivered by it or on its behalf.

         Section 4.08 Anti-Hedging. Purchaser represents and warrants to, and
covenants and agrees with, the Company that it will not at any time prior to the
tenth anniversary of the Tranche II Closing Date engage in any put, call,
option, short-sale, hedge, straddle or similar transactions in the Company's
Capital Stock intended to reduce Purchaser's risk of owning the Company's
Capital Stock.

         Section 4.09 Restricted Securities. Purchaser understands that the
Securities it is purchasing are characterized as "restricted securities" under
the federal securities laws

                                      -19-

<PAGE>

inasmuch as they are being acquired from the Company in a transaction not
involving a public offering and that under such laws and applicable regulations
such securities may be resold without registration under the Securities Act,
only in certain limited circumstances. In this connection, such Purchaser
represents that it is familiar with Rule 144 of the Commission promulgated under
the Securities Act.

         Section 4.10 Certain Fee. No fees or commissions will be payable by
Purchaser to brokers, finders, or investment bankers with respect to the
purchase of any of the Securities or the consummation of the transaction
contemplated by this Agreement. Purchaser agrees that it will, jointly and
severally, indemnify and hold harmless the Company from and against any and all
claims, demands, or liabilities for broker's, finders, placement, or other
similar fees or commissions incurred by Purchaser or alleged to have been
incurred by Purchaser in connection with the purchase of the Securities or the
consummation of the transaction contemplated by this Agreement.

         Section 4.11 No Implied Representations. Notwithstanding anything to
the contrary contained in this Agreement, it is the express understanding of
Purchaser that the Company is not making any representation or warranty
whatsoever, express or implied, other than those representations and warranties
of the Company expressly set forth in this Agreement.

         Section 4.12 Available Funds. Purchaser has the funds on hand necessary
to satisfy its obligation to pay for the Common Shares on the Tranche I Closing
Date pursuant to Section 2.02(a). Purchaser has, or will have on the Tranche II
Closing Date, the funds on hand necessary to satisfy its obligation to pay for
the Preferred Shares on the Tranche II Closing Date pursuant to Section 2.02(b).

                                   ARTICLE V.
                             CONDITIONS TO CLOSINGS

         Section 5.01 Conditions to the Purchaser's Obligation to Purchase the
Shares at the Tranche I Closing. In addition to any other applicable conditions
set forth herein, Purchaser's obligation to purchase the Shares at the Tranche I
Closing, is subject to the satisfaction of the following conditions, each of
which may be waived in the sole discretion of Purchaser:

              (a) Representations and Warranties True; Performance of
     Obligations. The representations and warranties made by the Company in
     Article III hereof that are qualified as to materiality or Material Adverse
     Effect shall be true and correct in all respects and the representations
     and warranties made by the Company in Article III hereof that are not so
     qualified shall be true and correct in all material respects (other than
     the representations and warranties set forth in Sections 3.17, 3.23 and
     3.24 hereof, which shall be true and correct in all respects) as of the
     Tranche I Closing Date, except (A) for changes contemplated by this
     Agreement and (B) for those representations and warranties that address
     matters only as of a particular date (which representations and warranties
     which address matters only as of a particular date shall be true and
     correct in all respects or in all material respects, as the case may be, as
     of such particular date). The Company shall have performed all obligations
     and satisfied all conditions herein required to be performed or observed or
     satisfied by it on or prior to the Tranche I Closing Date;

                                      -20-

<PAGE>

              (b) Legal Investment. On the Tranche I Closing Date, the sale and
     issuance of the Shares shall be legally permitted by all laws, regulations
     and NYSE listing rules to which Purchaser and the Company are subject;

              (c) Consents, Permits, and Waivers. The Company shall have
     obtained all consents, permits and waivers necessary for consummation of
     the Tranche I Closing Date transactions contemplated by this Agreement and
     the other Basic Documents;

              (d) Corporate Documents. The Company shall have delivered to
     Purchaser or its counsel, copies of all corporate documents of the Company
     as Purchaser shall reasonably request;

              (e) Secretary's Certificate; Good Standing Certificate. The
     Company shall have delivered to Purchaser a certificate executed by the
     Secretary of the Company, dated the Tranche I Closing Date, certifying as
     to (A) the resolutions of the Board of Directors evidencing approval of the
     transactions contemplated by and from this Agreement and the Basic
     Documents and the authorization of the named officer or officers to execute
     and deliver this Agreement and the Basic Documents, (B) the Certificate of
     Incorporation and the Bylaws of the Company, in each case, as amended, and
     (C) certain of the officers of the Company, their titles and examples of
     their signatures. The Company shall have delivered to Purchaser a
     certificate, dated as of the Tranche I Closing Date, certifying as to the
     fulfillment of the condition set forth in Section 5.01(a) hereof. The
     Company shall have delivered to Purchaser a certificate of the Secretary of
     State of the State of Delaware, dated a recent date in relation to the
     Tranche I Closing Date, that the Company is in good standing;

              (f) No Material Adverse Effect. No event or change has occurred
     which has had, or could reasonably be expected to have, a Material Adverse
     Effect;

              (g) Investor's Rights Agreement. The Investor's Rights Agreement,
     in the form attached hereto as Exhibit C, shall have been executed and
     delivered by the Company;

              (h) Legal Opinion. Purchaser shall have received from legal
     counsel to the Company and Winston & Strawn opinions addressed to it, dated
     as of the Tranche I Closing Date, in the forms substantially similar in
     substance to the forms of opinions attached hereto as Exhibits A-1 and A-2;
     and

              (i) Aquila Consent. The Aquila Consent shall have been executed
     and delivered by Aquila and the Company and be in full force and effect.

         Section 5.02 Conditions to the Purchaser's Obligation to Purchase
Shares at the Tranche II Closing. In addition to any other applicable conditions
set forth herein, Purchaser's obligation to purchase the Shares at the Tranche
II Closing is subject to the satisfaction of the following conditions, each of
which may be waived in the sole discretion of Purchaser:

                                      -21-

<PAGE>

              (a) Representations and Warranties True; Performance of
     Obligations. The representations and warranties made by the Company in
     Article III hereof shall be true and correct in all material respects
     (other than the representations and warranties set forth in Sections 3.17,
     3.23 and 3.24 hereof, which shall be true and correct in all respects) as
     of the Tranche II Closing Date, except (A) for changes contemplated by this
     Agreement and (B) for those representations and warranties that address
     matters only as of a particular date (which representations and warranties
     which address matters only as of a particular date shall be true and
     correct in all respects or in all material respects, as the case may be, as
     of such particular date). The Company shall have performed all obligations
     and satisfied all conditions herein required to be performed or observed or
     satisfied by it on or prior to the Tranche II Closing Date; provided,
     however, that the Company shall not be deemed to make the representations
     and warranties set forth in Section 3.03 as of the Tranche II Closing
     Date).

              (b) Legal Investment. On the Tranche II Closing Date, subject to,
     in the case of the Conversion Shares, the receipt of the Required
     Stockholder Vote, the sale and issuance of the Shares shall be legally
     permitted by all laws, regulations and NYSE listing rules to which
     Purchaser and the Company are subject;

              (c) Consents, Permits, and Waivers. The Company shall have
     obtained all consents, permits and waivers necessary for consummation of
     the Tranche II Closing Date transactions contemplated by this Agreement and
     the other Basic Documents;

              (d) Corporate Documents. The Company shall have delivered to
     Purchaser or its counsel, copies of all corporate documents of the Company
     as Purchaser shall reasonably request;

              (e) Secretary's Certificate; Good Standing Certificate. The
     Company shall have delivered to Purchaser a certificate executed by the
     Secretary of the Company, dated the Tranche II Closing Date, certifying as
     to (A) the resolutions of the Board of Directors evidencing approval of the
     transactions contemplated by and from this Agreement and the Basic
     Documents and the authorization of the named officer or officers to execute
     and deliver this Agreement and the Basic Documents, (B) the Certificate of
     Incorporation and the Bylaws of the Company, in each case, as amended, and
     (C) certain of the officers of the Company, their titles and examples of
     their signatures. The Company shall have delivered to Purchaser a
     certificate, dated as of the Tranche II Closing Date, certifying as to the
     fulfillment of the condition set forth in Section 5.02(a) hereof. The
     Company shall have delivered to Purchaser a certificate of the Secretary of
     State of the State of Delaware, dated a recent date in relation to the
     Tranche II Closing Date, that the Company is in good standing;

              (f) Legal Opinion. Purchaser shall have received from the
     Company's legal counsel and Winston & Strawn opinions addressed to it,
     dated as of the Tranche II Closing Date, in the forms substantially similar
     in substance to the forms of opinions attached hereto as Exhibits A-1 and
     A-2;

                                      -22-

<PAGE>

              (g) Certificate of Designation. The Certificate of Designation, in
     the form set forth in Exhibit B, shall have been adopted and executed by
     the Company and filed with and certified by the Secretary of State of the
     State of Delaware;

              (h) Covenant Amendments. The Company's financial covenants set
     forth in the Senior Loan Documents and the Note Purchase Agreement shall
     have been amended effective upon the Tranche II Closing in a manner
     reasonably acceptable to Purchaser;

              (i) Aquila Consent. The Aquila Consent shall have been executed
     and delivered by Aquila and the Company and be in full force and effect;
     and

         Section 5.03 Conditions to Obligations of the Company. In addition to
any other applicable conditions set forth herein, the Company's obligation to
issue and sell the Shares at the Tranche I Closing or Tranche II Closing, as
applicable, is subject to the satisfaction, on or prior to such Closing, of the
following conditions, each of which may be waived in the sole discretion of the
Company:

              (a) Representations and Warranties True. The representations and
     warranties made by Purchaser in Article IV hereof that are qualified as to
     materiality or Material Adverse Effect shall be true and correct in all
     respects and the representations and warranties made by the Company in
     Article IV hereof that are not so qualified shall be true and correct in
     all material respects at each Closing Date except (A) for changes
     contemplated by this Agreement and (B) for those representations and
     warranties that address matters only as of a particular date (which
     representations and warranties which address matters only as of a
     particular date shall be true and correct in all respects or in all
     material respects, as the case may be, as of such particular date) and (C)
     where the failure to be true and correct would not reasonably be expected
     to result in a material adverse effect on the ability of Purchaser to
     consummate the transactions contemplated by this Agreement. Purchaser shall
     have performed all obligations herein required to be performed or complied
     with by it on or before such Closing Date;

              (b) Consents, Permits, and Waivers. The Company shall have
     obtained all consents, permits and waivers necessary for consummation on
     such Closing Date of the transactions contemplated by this Agreement and
     the other Basic Documents;

              (c) Investor's Rights Agreement. With respect to the Tranche I
     Closing only, the Investor's Rights Agreement, in the form attached hereto
     as Exhibit C, shall have been executed and delivered by Purchaser;

              (d) Covenant Amendments. With respect to the Tranche II Closing
     Date, the Company's financial covenants set forth in the Senior Loan
     Documents and the Note Purchase Agreement shall have been amended effective
     upon the Tranche II Closing in a manner reasonably acceptable to the
     Company.

                                      -23-

<PAGE>

                                   ARTICLE VI.
                                    COVENANTS

         Section 6.01 Financial Statements and Reports. The Company shall
deliver, or shall cause to be delivered, to Purchaser:

              (a) Annual Financial Statements. As soon as available and in any
     event within 90 days after the end of each fiscal year of the Company, the
     audited consolidated statements of income, stockholders' equity, changes in
     financial position and cash flow of the Company and its Consolidated
     Subsidiaries for such fiscal year, and the related consolidated balance
     sheets of the Company and its Consolidated Subsidiaries as at the end of
     such fiscal year, and setting forth in each case in comparative form the
     corresponding figures for the preceding fiscal year, and accompanied by the
     related opinion of independent public accountants of recognized national
     standing, which opinion shall state that said financial statements fairly
     present the consolidated financial condition and results of operations of
     the Company and its Consolidated Subsidiaries as at the end of, and for,
     such fiscal year and that such financial statements have been prepared in
     accordance with GAAP except for such changes in such principles with which
     the independent public accountants shall have concurred. The provisions of
     this Section 6.01(a) shall be deemed satisfied as long as the Company
     timely files financial statements in accordance with, and meeting the
     requirements of, the Exchange Act, without extension.

              (b) Quarterly Financial Statements. As soon as available and in
     any event within 45 days after the end of each of the first three fiscal
     quarterly periods of each fiscal year of the Company, consolidated
     statements of income, stockholder's equity, changes in financial position
     and cash flow of the Company and its Consolidated Subsidiaries for such
     period and for the period from the beginning of the respective fiscal year
     to the end of such period, and the related consolidated balance sheets as
     of the end of the prior fiscal year and at the end of such period,
     accompanied by the certificate of a Responsible Officer, which certificate
     shall state that said financial statements fairly present the consolidated
     financial condition and results of operations of the Company and its
     Consolidated Subsidiaries in accordance with GAAP, as at the end of, and
     for, such period (subject to normal year-end audit adjustments). The
     provisions of this Section 6.01(b) shall be deemed satisfied as long as the
     Company timely files financial statements in accordance with, and meeting
     the requirements of, the Exchange Act, without extension.

              (c) SEC Filings, Etc. Promptly upon its becoming available, each
     financial statement, report, notice or proxy statement sent by the Company
     to stockholders generally and each regular or periodic report and any
     registration statement or prospectus in respect thereof filed by the
     Company with any securities exchange or the Commission or any successor
     agency. The requirements of this Section 6.01(c) shall be deemed to be
     satisfied as to those documents that are filed with the Commission upon the
     timely filing of such documents with the Commission.

                                      -24-

<PAGE>

              (d) Other Matters. Subject to any applicable restrictions on
     disclosure, from time to time such other information regarding the
     business, affairs or financial condition of the Company (including, without
     limitation, any Plan or Multiemployer Plan and any reports or other
     information required to be filed under ERISA) as Purchaser may reasonably
     request; provided, however, that the Company shall not be obligated
     pursuant to this Section 6.01 to provide access to any information that it
     reasonably considers to be a trade secret or similar confidential
     information.

         Section 6.02 Maintenance, Etc. The Company shall and shall cause each
Subsidiary to: (a) upon reasonable notice, permit representatives of Purchaser,
during normal business hours, to examine, copy and make extracts from its
financial books and records, to inspect its Properties, and to discuss its
business and affairs with its officers, all to the extent reasonably required by
Purchaser; provided, however, that the Company shall not be obligated pursuant
to this Section 6.02 to provide access to any information that it reasonably
considers to be a trade secret or similar confidential information; (b) preserve
and maintain its corporate existence and all of its material attendant rights,
privileges and franchises, keep appropriate books of record and account in
relation to its business and activities; provided, however, that the Company may
purchase or otherwise acquire all or substantially all of the stock or assets
of, or otherwise acquire by merger or consolidation, any of its Subsidiaries,
and any such Subsidiary may merge into, or consolidate with, or purchase or
otherwise acquire all or substantially all of the assets or stock of, or sell
all or substantially all of its assets or stock to, any other Subsidiary of the
Company or the Company, in each case so long as (i) if the transaction is with
the Company, the Company shall be the surviving entity to any such merger or
consolidation or (ii) if the transaction is not with the Company, a Subsidiary
shall be the surviving entity to any such merger or consolidation; (c) comply
with all Governmental Requirements, including, without limitation, any
Environmental Laws, except where the failure to comply would not reasonably be
expected to have a Material Adverse Effect; and (d) pay and discharge all taxes,
assessments and governmental charges or levies imposed on it or on its income or
profits or on any of its Property, except for any such tax, assessment, charge
or levy the payment of which is being contested in good faith and by proper
proceedings and against which adequate reserves are being maintained.

         Section 6.03 Further Assurances. The Company will cure promptly any
defects in the creation and issuance of the Shares and the Conversion Shares and
the execution and delivery of the Basic Documents. The Company at its expense
will promptly execute and deliver to Purchaser, upon request, all such other
documents, agreements and instruments to correct any omissions in the Basic
Documents or to make any recordings, to file any notices or obtain any consents,
all as may reasonably be necessary or appropriate in connection therewith.

         Section 6.04 Efforts; Performance of Obligations. Each party agrees to
use commercially reasonable efforts to take any and all actions required to
consummate the transactions contemplated in this Agreement and the other Basic
Documents. Each party will do and perform every act and discharge all of the
obligations to be performed and discharged by it under the Certificate of
Designation and the other Basic Documents, at the time and times and in the
manner specified.

                                      -25-

<PAGE>

         Section 6.05 Shares. The Company shall at all times during the term of
the Preferred Shares maintain a sufficient number of shares of Common Stock of
the Company to be issued as Conversion Shares upon the conversion of all or part
of the Preferred Shares.

         Section 6.06 Insurance. The Company shall maintain such insurance as to
comply with all requirements of law and agreements to which the Company or any
subsidiary is a party and otherwise sufficient to adequately insure against such
risks as are usually insured against in the same general area by companies
engaged in the same or similar business for the assets and operations of the
Company and each Subsidiary.

         Section 6.07 Use of Proceeds. The Company shall use the net proceeds
from the purchase and sale of the Shares solely (a) for the Company's
acquisition program, (b) for general working capital, and (c) to reduce senior
debt.

         Section 6.08 Notification of Certain Matters. The Company shall give
prompt notice to Purchaser of the occurrence or non-occurrence of any event the
occurrence or non-occurrence of which would be likely to cause the failure of
the Company to comply with or satisfy any covenant or agreement under this
Agreement.

         Section 6.09 Nomination of First Reserve Director Designee(s). If at
any time First Reserve would be entitled to elect one or more directors to the
Company's Board of Directors pursuant to the terms of Article VII of the
Investor's Rights Agreement, but for the unenforceability of such provision
under applicable law, the Company agrees to cause the person(s) that would have
been designated by First Reserve under such section to be nominated as directors
to the Company's Board of Directors.

         Section 6.10 Venture Capital Operating Companies. The Company shall
cooperate reasonably with Purchaser so that Purchaser may treat the purchase of
the Shares as contemplated by this Agreement as "venture capital investments"
within the meaning of the applicable "Venture Capital Operating Company" rules
issued by the Department of Labor under ERISA.

         Section 6.11 Covenant Amendments. Promptly following the date hereof,
Purchaser and the Company shall cooperate reasonably to develop a proposal with
respect to financial covenant amendments to be negotiated among the Company, the
Senior Lenders and the Note Holders. The Company and Purchaser shall use their
respective commercially reasonable efforts to cause such amendments (with such
changes as Company and Purchaser shall agree, acting reasonably) to be effected
as promptly as practicable following the date hereof.

         Section 6.12 Calling of Stockholders' Meeting. The Company shall, upon
Purchaser's written request, call a special meeting of the stockholders of the
Company before the end of the calendar year 2002 and its Board of Directors
shall recommend the approval by the Company's stockholders of (A) the conversion
rights of the Preferred Stock and (B) the issuance of such number of shares of
Common Stock as shall be issuable upon the conversion of the Preferred Stock. If
the stockholders do not approve such matters at such 2002 special meeting, the
Company's Board of Directors shall, upon Purchaser's written request, which
written request

                                      -26-

<PAGE>

may be repeated in 2003, 2004, 2005 and 2006, if necessary, recommend the
actions set forth in the previous sentence.

         Section 6.13 Fees and Expenses. The Company shall pay (i) all filing
fees associated with all filings required under the HSR Act and any other
notification or request for consent, approval or permission that may be required
by statute, regulation or judicial decrees in connection with the proposed
transaction, (ii) upon the Tranche I Closing, the Company shall reimburse
Purchaser for all reasonable fees and expenses incurred by Purchaser in
connection therewith and (iii) upon the Tranche II Closing, the Company shall
reimburse Purchaser for all reasonable fees and expenses incurred by Purchaser
in connection therewith (and, to effect such reimbursements, Purchaser shall be
entitled to deduct such amount from any amounts payable to the Company pursuant
to this Agreement).

         Section 6.14 Termination of Certain Covenants. The covenants set forth
in Sections 6.01, 6.02, 6.06, 6.07, 6.08 (with respect to covenants which have
terminated pursuant to this Section 6.14) and 6.12 shall terminate and be of no
further force and effect if the Voting Percentage of Purchaser and its
affiliates is less than 10%.

         Section 6.15 Grounds for Termination. This Agreement may be terminated
at any time prior to the Tranche II Closing:

              (a) by mutual written agreement of the Company and Purchaser;

              (b) by either the Company or Purchaser if the Tranche II Closing
     shall not have been consummated on or before December 7, 2002, unless
     extended by mutual agreement or unless the failure to consummate the
     Closing is attributable to a failure on the part of the party seeking to
     terminate this Agreement to perform any obligation required to be performed
     by such party at or prior to the Tranche II Closing Date; or

              (c) by either the Company or Purchaser if consummation of the
     transactions contemplated hereby would violate any nonappealable final
     order, decree or judgment of any court or Governmental Authority having
     competent jurisdiction.

         Any party desiring to terminate this Agreement pursuant to Section
6.15(b) or 6.15(c) shall promptly give notice of such termination to the other
party hereto.

         Section 6.16 Effect of Termination. If this Agreement is terminated as
permitted by Section 6.16, such termination shall be without liability of any
party (or any stockholder, director, officer, employee, agent, consultant or
representative of such party) to the other parties to this Agreement; provided
that if such termination shall result from the willful (a) failure of any party
to fulfill a condition to the performance of the obligations of the other
parties, (b) failure to perform a covenant of this Agreement or (c) breach by
any parties hereto of any representation or warranty or agreement contained
herein, such party shall be fully liable for any and all losses incurred or
suffered by the other parties as a result of such failure or breach. The
provisions of Sections 6.16, 7.06, 7.07, 7.08, 7.09, 7.10 shall survive any
termination hereof pursuant to Section 6.16.

                                      -27-

<PAGE>

         Section 6.18 NYSE Listing of Shares. Promptly after the Tranche I
Closing Date, the Company shall file a supplemental listing application and
obtain the authorization of the NYSE for the issuance of the Common Shares.
Promptly after the Company obtains the Required Stockholder Vote, the Company
shall file a supplemental listing application and obtain the authorization of
the NYSE for the issuance of the Conversion Shares.

         Section 6.19 Waiver of Accrued Series A Dividends. Purchaser waives any
and all rights and benefits in and to any accrued and unpaid dividends which
have accrued up to the date hereof and which are unpaid, whether declared or
undeclared, with respect to any Series A Preferred Stock being purchased by
Purchaser pursuant to the Aquila Sale.

                                  ARTICLE VII.
                                  MISCELLANEOUS

         Section 7.01 Interpretation and Survival of Provisions. Article,
Section, Schedule, and Exhibit references are to this Agreement, unless
otherwise specified. All references to instruments, documents, contracts, and
agreements are references to such instruments, documents, contracts, and
agreements as the same may be amended, supplemented, and otherwise modified from
time to time, unless otherwise specified. The word "including" shall mean
"including but not limited to." Whenever the Company has an obligation under the
Basic Documents, the expense of complying with that obligation shall be an
expense of the Company unless otherwise specified. Whenever any determination,
consent, or approval is to be made or given by Purchaser, such action shall be
in Purchaser's sole discretion unless otherwise specified in this Agreement. If
any provision in the Basic Documents is held to be illegal, invalid, not
binding, or unenforceable, such provision shall be fully severable and the Basic
Documents shall be construed and enforced as if such illegal, invalid, not
binding, or unenforceable provision had never comprised a part of the Basic
Documents, and the remaining provisions shall remain in full force and effect.
The Basic Documents have been reviewed and negotiated by sophisticated parties
with access to legal counsel and shall not be construed against the drafter. The
representation and warranties of the Company shall survive for the applicable
two-year period identified in the first paragraph of Article III above, and the
covenants made in this Agreement, or any other Basic Document shall survive the
closing of the transactions described herein and remain operative and in full
force and effect regardless of (a) any investigation made by or on behalf of the
Company or Purchaser or (b) acceptance of any of the Securities and payment
therefor and repayment or repurchase thereof. All indemnification obligations of
the Company and the provisions of Section 7.02 shall remain operative and in
full force and effect unless such obligations are expressly terminated in a
writing referencing those individual Sections, regardless of any purported
general termination of this Agreement.

         Section 7.02 Indemnification, Costs and Expenses.

              (a) Indemnification Regarding Company Activities. The Company
     agrees to indemnify Purchaser, and its officers, directors, employees,
     representatives, agents, attorneys, and Affiliates (collectively, "Related
     Parties") from, hold each of them harmless against and promptly upon demand
     pay or reimburse each of them for, any and all actions, suits, proceedings
     (including any investigations, litigation, or inquiries), claims, demands,
     and causes of action, and, in connection therewith, all reasonable costs,

                                      -28-

<PAGE>

     losses, liabilities, damages, or expenses of any kind or nature whatsoever,
     net of any insurance paid to Purchaser under the Company's insurance
     arrangements, (collectively, the "Indemnity Matters") that may be incurred
     by them or asserted against or involve any of them as a result of a claim
     by a Person that is not an Affiliate of Purchaser or any Related Parties
     under clauses (i), (ii), (iii) and (v) below (whether or not any of them is
     designated a party thereto) as a result of, arising out of, or in any way
     related to (i) any actual or proposed use by the Company of the proceeds of
     any sale of the Securities, (ii) the operations of the business of the
     Company or any of its Affiliates, (iii) the failure of the Company or any
     of its Affiliates to comply with any Governmental Requirement, (iv) the
     breach of the representations, warranties and covenants of the Company
     contained herein or in any of the other Basic Documents, provided such
     claim for indemnification relating to a breach of the representations and
     warranties is made prior to the expiration of such representations and
     warranties, or (v) any other aspect of this Agreement and the other Basic
     Documents, including, without limitation, the reasonable fees and
     disbursements of counsel and all other reasonable expenses incurred in
     connection with investigating, defending or preparing to defend any such
     action, suit, proceeding (including any investigations, litigation, or
     inquiries), or claim and INCLUDING ALL INDEMNITY MATTERS ARISING BY REASON
     OF THE NEGLIGENCE OF ANY INDEMNITEE (but not Indemnity Matters related to
     the gross negligence or willful misconduct of any Indemnitee).

              (b) Indemnification Regarding Taxes. The Company agrees to pay and
     hold Purchaser harmless from and against any and all present and future
     stamp and other similar taxes with respect to this Agreement and Basic
     Documents and save Purchaser harmless from and against any and all
     liabilities with respect to or resulting from any delay or omission to pay
     such taxes, and will indemnify Purchaser for the full amount of taxes paid
     by Purchaser (not to include income or gross receipt tax liability) in
     respect of payments made or to be made under this Agreement or any other
     Basic Document and any liability (including penalties, interest, and
     expenses) arising therefrom or with respect thereto, whether or not such
     taxes were correctly or legally asserted.

              (c) Indemnification Regarding Environmental Matters. The Company
     agrees to indemnify and hold harmless from time to time Purchaser and its
     Related Parties from and against any and all losses, claims, cost recovery
     actions, administrative orders or proceedings, damages, and liabilities to
     which Purchaser and its Related Parties may incur, have asserted against
     them or involve any of them pursuant to a claim by a Person that is not an
     Affiliate of Purchaser or any Related Parties (i) under any Environmental
     Law applicable to the Company, any Subsidiary, or any of their respective
     Properties, (ii) as a result of the breach or non-compliance by the Company
     or any Subsidiary with any Environmental Law applicable to the Company or
     any Subsidiary, or any of their respective Properties, (iii) due to the
     ownership by the Company or any Subsidiary of their respective Properties
     or any activity on any of their respective Properties, or any past activity
     on any of their respective Properties which, though lawful and fully
     permissible at the time, could result in present liability under any
     Environmental Law, (iv) the presence, use, release, storage, treatment, or
     disposal of hazardous substances on or at any of the properties owned or
     operated by the Company or any Subsidiary, or (v) any other environmental,
     health, or safety condition in

                                      -29-

<PAGE>

     connection with this Agreement or any other Basic Document; provided,
     however, that the Company shall not be required to indemnify Purchaser or
     its Related Parties for any diminution in the value of its investment in
     the Company resulting from any environmental matter described in this
     Section 7.02(c).

              (d) Indemnification Procedure. Promptly after Purchaser or other
     Person indemnified hereunder (hereinafter, the "Indemnified Party") has
     received notice or has knowledge of any claim for indemnification
     hereunder, or the commencement of any action or proceeding by a third
     person, that the Indemnified Party believes in good faith is an
     indemnifiable claim under this Agreement, the Indemnified Party shall give
     the Company written notice of such claim or the commencement of such action
     or proceeding, but failure so to notify the Company will not relieve the
     Company of any liability which it may have to such Indemnified Party
     hereunder except to the extent that the Company is materially prejudiced by
     such failure. Such notice shall state the nature and the basis of such
     claim. The Company shall have the right to defend and settle, at its own
     expense and by its own counsel, any such matter. If the Company undertakes
     to defend or settle, it shall promptly notify the Indemnified Party of its
     intention to do so, and the Indemnified Party shall cooperate with the
     Company and its counsel in all commercially reasonable respects in the
     defense thereof and the settlement thereof. Such cooperation shall include,
     but shall not be limited to, furnishing the Company with any books, records
     and other information reasonably requested by the Company and in the
     Indemnified Party's possession or control. Such cooperation of the
     Indemnified Party shall be at the cost of the Company. After the Company
     has notified the Indemnified Party of its intention to undertake to defend
     or settle any such asserted liability, the Company shall not be liable for
     any additional legal expenses incurred by the Indemnified Party in
     connection with any defense or settlement of such asserted liability;
     provided, however, that the Indemnified Party shall be entitled (i) at its
     expense, to participate in the defense of such asserted liability and the
     negotiations of the settlement thereof or (ii) if (A) the Company has
     failed to assume the defense and employ counsel or (B) if the defendants in
     any such action include both the Indemnified Party and the Company and
     counsel to the Indemnified Party shall have concluded that there may be
     reasonable defenses available to the Indemnified Party that are different
     from or additional to those available to the Company or if the interests of
     the Indemnified Party reasonably may be deemed to conflict with the
     interests of the Company, then the Indemnified Party shall have the right
     to select a separate counsel and to assume such legal defense and otherwise
     to participate in the defense of such action, with the expenses and fees of
     such separate counsel and other expenses related to such participation to
     be reimbursed by the Company as incurred, and the Company shall not settle
     any such claim without the consent of the Indemnified Party unless the
     settlement thereof imposes no liability or obligation on, and includes a
     complete release from liability of, the Indemnified Party. If the
     Indemnified Party undertakes such a defense through counsel of its choice,
     the Indemnified Party may settle such matter, and the Company shall
     reimburse the Indemnified Party for the amount paid in such settlement and
     any other liabilities or expenses incurred by the Indemnified Party in
     connection therewith.

              (e) Survival. The Company's obligations under this Section 7.02
     shall survive any termination of this Agreement and the payment of the
     Obligations.

                                      -30-

<PAGE>

               (f) Acknowledgement. THE INDEMNIFICATION AND RELEASE PROVISIONS
     PROVIDED FOR IN THIS AGREEMENT SHALL BE APPLICABLE WHETHER OR NOT THE
     LOSSES, COSTS, EXPENSES AND DAMAGES IN QUESTION AROSE SOLELY OR IN PART
     FROM (i) THE ACTIVE, PASSIVE OR CONCURRENT NEGLIGENCE (EXCEPT THAT THE
     COMPANY WILL NOT INDEMNIFY ANY INDEMNIFIED PARTY FOR ANY LOSSES, COSTS,
     EXPENSES AND DAMAGES ARISING SOLELY OR IN PART FROM THE GROSS NEGLIGENCE OR
     WILLFUL MISCONDUCT OF SUCH INDEMNIFIED PARTY), OR OTHER FAULT OF ANY
     INDEMNIFIED PARTY OR (ii) ANY ACTION THAT SUBJECTS THE INDEMNIFIED PARTY TO
     CLAIMS PREMISED IN WHOLE OR IN PART IN STRICT LIABILITY. THE COMPANY AND
     PURCHASER ACKNOWLEDGE THAT THIS STATEMENT COMPLIES WITH THE EXPRESS
     NEGLIGENCE RULE AND IS CONSPICUOUS.

         Section 7.03 No Waiver; Modifications in Writing.

               (a) Delay. No failure or delay on the part of either party in
     exercising any right, power, or remedy hereunder shall operate as a waiver
     thereof, nor shall any single or partial exercise of any such right, power,
     or remedy preclude any other or further exercise thereof or the exercise of
     any right, power, or remedy. The remedies provided for herein are
     cumulative and are not exclusive of any remedies that may be available to a
     party at law or in equity or otherwise.

               (b) Specific Waiver. Except as otherwise provided herein, no
     amendment, waiver, consent, modification, or termination of any provision
     of this Agreement or any other Basic Document shall be effective unless
     signed by the Company and Purchaser. Any amendment, supplement or
     modification of or to any provision of this Agreement or any other Basic
     Document, any waiver of any provision of this Agreement or any other Basic
     Document, and any consent to any departure by the Company from the terms of
     any provision of this Agreement or any other Basic Document shall be
     effective only in the specific instance and for the specific purpose for
     which made or given.

         Section 7.04 Binding Effect; Assignment.

               (a) Binding Effect. This Agreement shall be binding upon the
     Company, Purchaser, and their respective successors and permitted assigns.
     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 parties to this Agreement, and their respective successors and
     permitted assigns.

               (b) Assignment of Shares. All or any portion of Shares or the
     Conversion Shares purchased pursuant to this Agreement may be sold,
     assigned or pledged by Purchaser, subject to compliance with applicable
     securities laws and the restrictions on transfer set forth in the
     Investor's Rights Agreement.

                                      -31-

<PAGE>

              (c)     Assignment of Rights. All or any portion of the rights and
     obligations of Purchaser under this Agreement with respect to the Basic
     Documents, except as set forth therein, may be transferred by Purchaser;
     provided, however, that the rights set forth in the Investor's Rights
     Agreement may not be transferred to a transferee of the Shares or
     Conversion Shares, except in the case of transfers to one or more
     Affiliates of Purchaser in accordance with the terms and conditions of the
     Investor's Rights Agreement; provided, however, that Purchaser may not
     transfer any rights or obligations under this Agreement to any Competitor
     (as defined in the Investor's Rights Agreement). Purchaser acknowledges and
     agrees that it may not transfer any rights or obligations under this
     Agreement without compliance with all relevant restrictions on transfer of
     any Common Stock or Preferred Stock imposed by any Basic Document. Without
     limiting the foregoing, Purchaser shall not transfer Shares representing
     15% or more of the outstanding Voting Securities to any one person in a
     transaction or a series of transactions, unless any such transferee
     provides to the Company an agreement reasonably acceptable to a majority of
     the Company's directors that were not appointed (pursuant to Article VII of
     the Investor's Rights Agreement) by, or affiliated with, Purchaser pursuant
     to which such transferee agrees to be bound by all provisions of this
     Agreement applicable to Purchaser; provided, that in no case shall the
     Voting Percentage ownership of any such transferee exceed the Standstill
     Amount. Upon any permitted 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 Purchaser shall be automatically
     released from any such obligations hereunder with respect to the Basic
     Documents to the extent assigned, except in the case of an assignment to an
     Affiliate of Purchaser in which event Purchaser shall be secondarily liable
     in respect of its obligations under the Basic Documents. Upon the request
     of Purchaser in connection with any transfer of the Shares or Conversion
     Shares, the Company shall execute and deliver any amendment to this
     Agreement, and the other Basic Documents reasonably requested by Purchaser
     to reflect the transfer and delineate the rights of the transferor and the
     transferee provided that the Company shall not be liable for the expenses
     incurred in documenting such amendment.

         Section 7.05 Replacement Securities. Upon receipt of evidence
satisfactory to the Company of the loss, theft, destruction, or mutilation of
any certificate or certificates representing Shares or Conversion Shares and, in
the case of any such loss, theft, or destruction, upon delivery of any indemnity
or other obligation reasonably requested by the Company or its transfer agent to
the Company or, in the case of any such mutilation, upon surrender or
cancellation thereof, the Company will issue a new certificate or certificates.

         Section 7.06 Communications. All notices and demands provided for
hereunder shall be in writing and shall be given by registered or certified
mail, return receipt requested, telecopy, air courier guaranteeing overnight
delivery or personal delivery to the following addresses:

                                      -32-

<PAGE>

         If to Purchaser:

         First Reserve Fund IX, L.P.
         c/o First Reserve Corporation
         600 Travis Street
         Suite 6000
         Houston, Texas 77002
         Attention:  Ben A. Guill
         Telecopier: (713) 224-0771

         With a copy to:

         Skadden, Arps, Slate, Meagher &
         Flom LLP
         Four Times Square
         New York, New York 10036
         Attention:  Howard L. Ellin
         Telecopier: (212) 735-2000

         If to the Company:

         Quanta Services, Inc.
         1360 Post Oak Boulevard, Suite 2100
         Houston, Texas 77056
         Attention:  Vice President and General Counsel
         Telecopier: (713) 629-7676

         or to such other address as the Company or any Purchaser may designate
in writing. All other communications may be by regular mail or Internet
electronic mail. All notices and communications shall be deemed to have been
duly given: at the time delivered by hand, if personally delivered; upon actual
receipt if sent by certified mail, return receipt requested; when receipt
acknowledged, if telecopied; and upon actual receipt when delivered to an air
courier guaranteeing overnight delivery.

         Section 7.07 Governing Law; Consent to Jurisdiction. This Agreement
will be construed in accordance with and governed by the laws of the State of
Delaware without regard to principles of conflicts of laws. Any judicial
proceedings with respect to this Agreement shall be brought in a federal or
state court located in the State of Delaware, and by execution and delivery of
this Agreement, each party submits, irrevocably and unconditionally, to the
exclusive jurisdiction of such court and any related appellate court,
irrevocably agrees to be bound by any judgment rendered thereby, and waives any
objection to the laying of venue in any such proceedings in such courts. To the
fullest extent permitted by law, the parties hereto further agree that service
of any process, summons, notice or document by U.S. certified or registered mail
to such party's address for notices as set forth in Section 7.06 shall be
effective service of process in any action, suit or proceeding in Delaware with
respect to any matters to which it has submitted to jurisdiction as set forth in
the immediately preceding sentence. It is accordingly agreed that the parties
shall be entitled to an injunction or injunctions, including preliminary

                                      -33-

<PAGE>

relief, to prevent breaches of this Agreement and to enforce specifically the
terms and provisions hereof, this being in addition to any other remedy to which
they are entitled at law or in equity. If any party shall institute any action
or proceeding to enforce the provisions hereof, the party against whom such
action or proceeding is brought hereby waives any claim or defense therein that
the plaintiff party has an adequate remedy at law. The parties hereto hereby
irrevocably and unconditionally waive and agree not to plead or claim in any
such court that any such action, suit or proceeding brought in such court has
been brought in an inconvenient forum and waive, to the fullest extent permitted
by law, all rights to trial by jury in any action, proceeding or counterclaim
(whether based upon contract, tort or otherwise) arising out of or relating to
this Agreement or any of the transactions contemplated hereby.

         Section 7.08 Expenses. Except as set forth in Section 6.13 hereof, each
party to this Agreement shall each bear its own expenses incurred in connection
with the transactions contemplated by this Agreement and the Basic Documents.

         Section 7.09 Execution in Counterparts. This Agreement may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original and all of which counterparts, taken together, shall
constitute but one and the same Agreement.

         Section 7.10 No Third Party Beneficiaries. Nothing contained in this
Agreement is intended to confer upon any Person other than the parties hereto
and their respective successors and permitted assigns, any benefit, right or
remedies under or by reason of this Agreement; provided, however, that the
parties hereto hereby acknowledge and agree that the Indemnified Parties are
third party beneficiaries of this Agreement.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                      -34-

<PAGE>

         IN WITNESS WHEREOF, the parties hereto execute this Agreement,
effective as of the date first above written.

                               QUANTA SERVICES, INC.,
                               a Delaware corporation

                               By: /s/ Dana A. Gordon
                                  -------------------------------
                               Name:  Dana A. Gordon
                               Title: Vice President - General Counsel

                               FIRST RESERVE FUND IX, L.P.
                               By: First Reserve GP IX, L.P., General Partner
                               By: First Reserve G.P. IX, Inc., General Partner

                               By: /s/ Thomas R. Denison
                                  -------------------------------
                               Name:  Thomas R. Denison
                               Title: Managing Director

                                SIGNATURE PAGE TO
                          SECURITIES PURCHASE AGREEMENT

                                      -35-

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