Execution Version




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CONTENTS
 Clause
    
    
    
    PageARTICLE 1DEFINITIONSSection 1.1
    
    Defined Terms
    
    
    1Section 1.2
    
    Other Definitional Provisions
    
    
    8Section 1.3
    
    Rules of Construction
    
    
    8ARTICLE 2AMOUNT AND TERMS OF COMMITMENTSSection 2.1
    
    Working Capital Facility Commitments
    
    
    8Section 2.2
    
    Procedure for Working Capital Facility Borrowings
    
    
    9Section 2.3
    
    Repayment of Working Capital Loans
    
    
    11Section 2.4
    
    Optional Prepayments
    
    
    11Section 2.5
    
    Conversion and Continuation Options
    
    
    12Section 2.6
    
    Interest Rates and Payment Dates
    
    
    12Section 2.7
    
    Computation of Interest and Fees
    
    
    13Section 2.8
    
    Inability to Determine Interest Rate
    
    
    13Section 2.9
    
    Pro Rata Treatment and Payments
    
    
    14Section 2.10
    
    Fees
    
    
    16Section 2.11
    
    Cancellation of Working Capital Facility Commitments
    
    
    17ARTICLE 3REPRESENTATIONS AND WARRANTIESSection 3.1
    
    Representations and Warranties of the Borrower
    
    
    17ARTICLE 4CONDITIONS PRECEDENTSection 4.1
    
    Conditions Precedent to the Initial Closing Date and the Initial Working Capital Facility Borrowing
    
    
    17Section 4.2
    
    Conditions Precedent to Each Working Capital Facility Borrowing
    
    
    18Section 4.3
    
    Conditions Precedent to the Initial Disbursement of Tranche A-2 Loans and Tranche B Loans
    
    
    19




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Clause
    
    
    
    PageARTICLE 5AFFIRMATIVE COVENANTSSection 5.1
    
    Affirmative Covenants of the Borrower
    
    
    21ARTICLE 6 NEGATIVE COVENANTSSection 6.1
    
    Negative Covenants of the Borrower
    
    
    21ARTICLE 7 REPORTING OBLIGATIONSSection 7.1
    
    Reporting Obligations of the Borrower
    
    
    21ARTICLE 8 EVENTS OF DEFAULTSection 8.1
    
    Events of Default; Remedies
    
    
    21ARTICLE 9THE WORKING CAPITAL FACILITY ADMINISTRATIVEAGENTSection 9.1
    
    Appointment
    
    
    22Section 9.2
    
    Delegation of Duties
    
    
    22Section 9.3
    
    Exculpatory Provisions
    
    
    23Section 9.4
    
    Reliance by Working Capital Facility Administrative Agent
    
    
    23Section 9.5
    
    Notice of Default
    
    
    23Section 9.6
    
    Non-Reliance on Working Capital Facility Administrative Agent and Other Working Capital Facility Lenders
    
    
    24Section 9.7
    
    Indemnification
    
    
    24Section 9.8
    
    Agent in Its Individual Capacity
    
    
    25Section 9.9
    
    Successor Working Capital Facility Administrative Agent
    
    
    25ARTICLE 10 MISCELLANEOUSSection 10.1
    
    Incorporation of Miscellaneous Provisions by Reference
    
    
    26Section 10.2
    
    Amendments and Waivers
    
    
    26Section 10.3
    
    Notices
    
    
    27




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Clause
    
    
    
    PageSection 10.4
    
    Survival of Representations and Warranties
    
    
    27Section 10.5
    
    Successors and Assigns; Participations and Assignments
    
    
    27Section 10.6
    
    Adjustments; Set off
    
    
    30Section 10.7
    
    Counterparts
    
    
    31Section 10.8
    
    Severability
    
    
    31Section 10.9
    
    Integration
    
    
    31Section 10.10
    
    GOVERNING LAW, SUBMISSION TO JURISDICTION, ETC
    
    
    31
 SCHEDULES
 1
    
    Commitments
 EXHIBITS
 A
    
    Form of Assignment and AssumptionB
    
    Form of Interest Rate NoticeC
    
    Form of Working Capital Facility Notice of BorrowingD
    
    Form of Disbursement LCE
    
    Form of Guarantor Confirmation




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Agreement sociedad anónima de capital variable Borrower Working Capital Facility Administrative Agent
 WITNESSETH;
 WHEREAS, Existing Working Capital Facility Credit Agreement
 WHEREAS, Existing Working Capital Loans
 WHEREAS,
 WHEREAS,
 NOW, THEREFORE,
 ARTICLE 1
DEFINITIONS
 Defined Terms
 Additional Works
 1




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Agent Indemnitee
 Agreement
 Amendment Effective Date
 Amendment No.1 to the Depositary Agreement
 Amendment No.1 to the Intercreditor Agreement
 Amendment No.1 to the U.S. Security Agreement
 Applicable Margin per
annum, per annum.
 Applicable Expansion Margin
 per annum
 per annum
 per annum
 per annum.
 Approved Fund
 Assignee
 Assignment Exhibit
A
 Availability Period
 2




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Benefitted Lender
 Borrower
 Borrowing Date
 Consent, Joinder, Waiver and Amendment No.3 to the Common Agreement
 Cost Certificate Exhibit C
 Critical Event Evento Crítico
 Critical Event Date Fecha de Evento Crítico
 Disbursement LC Provider
 Disbursement LCs Exhibit D
 Existing Working Capital Facility Credit Agreement
 Existing Working Capital Loans
 Funding Office
 ICA Confirmation
 3




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Interest Payment Date
 Interest Period provided
     Interest Rate Notice
 Monthly Payment Date
 Nacional and Alcance Confirmation
 Participant
 Permissible Critical Event Delay
 4




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provided
 Register
 Tranche A Commitment
 Tranche A Lenders
 Tranche A Loan
 Tranche A-1 Borrowing
 Tranche A-1 Commitment Schedule 1
 5




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Tranche A-1 Lenders provided
 Tranche A-1 Loan
 Tranche A-1 Percentage Schedule 1
 Tranche A-2 Borrowing
 Tranche A-2 Commitment Schedule 1
 Tranche A-2 Lenders provided,
 Tranche A-2 Loan
 Tranche A-2 Percentage Schedule 1
 Tranche B Borrowing
 6




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Tranche B Commitment Schedule 1
 Tranche B Lenders provided,
 Tranche B Loan
 Tranche B Percentage Schedule 1
 United States
 Working Capital Facility Administrative Decision proviso
 Working Capital Facility Commitment
 Working Capital Facility Expansion Documents
 Working Capital Facility Lenders
 Working Capital Facility Notice of Borrowing Exhibit C
 7




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Working Capital Facility Percentage
 Working Capital Loan
 Other Definitional Provisions
  Rules of Construction provided, that,
 ARTICLE 2
AMOUNT AND TERMS OF COMMITMENTS
 Working Capital Facility Commitments
  8




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Procedure for Working Capital Facility Borrowings
 pro rata
  9




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provided, however,
 Interest Rate Notice Exhibit B
   10




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Repayment of Working Capital Loans
 Optional Prepayments provided,
 11




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Conversion and Continuation Options provided provided
 Interest Period provided provided further,
 Interest Rates and Payment Dates
  per
annum per annum
 12




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per annum
   Computation of Interest and Fees
  Inability to Determine Interest Rate
   13




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Pro Rata Treatment and Payments pro rata
 pro rata
 pro rata
 pro rata first pro rata second pro rata pro rata
 14




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pro rata pro rata pro rata
  15




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pro rata
 Fees
 per annum,
 per annum,
  16




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per annum,
   Cancellation of Working Capital Facility Commitments
 ARTICLE 3
REPRESENTATIONS AND WARRANTIES
 Representations and Warranties of the Borrower mutatis mutandis,
 ARTICLE 4
CONDITIONS PRECEDENT
 Conditions Precedent to the Initial Closing Date and the Initial Working
Capital Facility Borrowing mutatis mutandis, (provided, that,
 17




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Conditions Precedent to Each Working Capital Facility Borrowing mutatis mutandis, (provided, that,
    18




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Conditions Precedent to the Initial Disbursement of Tranche A-2 Loans and
Tranche B Loans
    19




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20




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ARTICLE 5
AFFIRMATIVE COVENANTS
 Affirmative Covenants of the Borrower
 ARTICLE 6
NEGATIVE COVENANTS
 Negative Covenants of the Borrower mutatis mutandis,
 ARTICLE 7
REPORTING OBLIGATIONS
 Reporting Obligations of the Borrower mutatis mutandis,
 ARTICLE 8
EVENTS OF DEFAULT
 Events of Default; Remedies
 mutatis mutandis,
   21




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ARTICLE 9
THE WORKING CAPITAL FACILITY ADMINISTRATIVE AGENT
 Appointment
 Delegation of Duties
 22




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Exculpatory Provisions
 Reliance by Working Capital Facility Administrative Agent
 Notice of Default
 23




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provided
 Non-Reliance on Working Capital Facility Administrative Agent and Other
Working Capital Facility Lenders
 Indemnification Agent Indemnitee
 24




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provided
 Agent in Its Individual Capacity Working Capital Facility Lender Working
Capital Facility Lenders
 Successor Working Capital Facility Administrative Agent Working
Capital Facility Administrative Agent
 25




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ARTICLE 10
MISCELLANEOUS
 Incorporation of Miscellaneous Provisions by Reference
 Amendments and Waivers provided
    26




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Notices
 Survival of Representations and Warranties
 Successors and Assigns; Participations and Assignments
 Assignee
 provided
 provided
 27




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provided
    Approved Fund
  28




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Register
  Participant provided
 29




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provided
 provided,
 Adjustments; Set off Benefitted Lender
 30




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provided, however,
 provided
 Counterparts
 Severability
 Integration
 GOVERNING LAW, SUBMISSION TO JURISDICTION, ETC
  31




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32




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CONSTRUCTORA DE PROYECTOS
HIDROELECTRICOS, S.A. DE C.V.,as the
BorrowerBy:
    /s/ Luis Horcasitas ManjarrezName:
    Luis Horcasitas ManjarrezTitle:
    Legal Representative




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WESTLB AG, NEW YORK BRANCH,as
Working Capital Facility Administrative AgentBy:
    /s/ Jared BrennerName:
    Jared BrennerTitle:
    Executive DirectorBy:
    /s/ Cristhyan ReyName:
    Cristhyan ReyTitle:
    Associate Director




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TRANCHE A LENDERSWESTLB AG, NEW YORK BRANCH,as a
Tranche A-1 Lender and a Tranche A-2 LenderBy:
    /s/ Jared BrennerName:
    Jared BrennerTitle:
    Executive DirectorBy:
    /s/ Cristhyan ReyName:
    Cristhyan ReyTitle:
    Associate Director




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TRANCHE B LENDERSCITIBANK, N.A., NASSAU BAHAMAS BRANCH,as a Tranche B LenderBy:
    /s/ Leslie MunroeName:
    Leslie MunroeTitle:
    Attorney-In-Fact
Citibank N.A.
Nassau Bahamas Branch




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SCHEDULE 1 TO
AMENDED AND RESTATEDWORKING CAPITAL FACILITY CREDIT AGREEMENT
 TRANCHE A-1 COMMITMENTS AND PERCENTAGES
 TRANCHE A-1
    
    TRANCHE A-1LENDER
    
    COMMITMENT
    
    PERCENTAGEWestLB AG, New York 
Branch
    
    U.S.$80,000,000
    
    100%
 Total Tranche A-1
    
    Total Tranche A-1Commitments
    
    PercentagesU.S.$80,000,000
    
    100%
 TRANCHE A-2 COMMITMENTS AND PERCENTAGES
 TRANCHE A-2
    
    TRANCHE A-2LENDER
    
    COMMITMENT
    
    PERCENTAGEWestLB AG, New York 
Branch
    
    U.S.$30,000,000
    
    100%
 Total Tranche A-2
    
    Total Tranche A-2Commitments
    
    PercentagesU.S.$30,000,000
    
    100%




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TRANCHE B COMMITMENTS AND PERCENTAGES
 TRANCHE B
    
    TRANCHE BLENDER
    
    COMMITMENT
    
    PERCENTAGECitibank, N.A., Nassau 
Bahamas Branch
    
    U.S.$30,000,000
    
    100%
 Total Tranche B
    
    Total Tranche BCommitments
    
    PercentagesU.S.$30,000,000
    
    100%




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EXHIBIT A TO  AMENDED AND RESTATED  WORKING CAPITAL FACILITY CREDIT AGREEMENT
 [FORM OF ASSIGNMENT]
 Agreement 1 2 Assignor Assignee Borrower 3 Working
Capital Facility Administrative Agent 4
 PRELIMINARY STATEMENTS
 Working Capital Facility Credit Agreement Working Capital Facility Lenders
  Assigned
Commitment Assigned Loans 5
 NOW THEREFORE,
 
 1
    
    Insert if this agreement is between the Assignor and Assignee only.2
    
    Insert if this agreement is among the Assignor, the Assignee, the Working Capital
Facility Administrative Agent and, if applicable, the Borrower.3
    
    Insert if no Event of Default has occurred and is continuing and the Assignee is not
(A) a Working Capital Facility Lender, (B) an affiliate of a Working Capital Facility Lender or
(C) an Approved Fund.4
    
    Insert if the Assignee is not (A) a Working Capital Facility Lender, (B) an affiliate
of a Working Capital Facility Lender or (C) an Approved Fund.5
    
    Each assignment must be of a constant percentage of all of the assigning Working
Capital Facility Lenders rights (including its Working Capital Loans) and obligations (including
its Working Capital Facility Commitments).




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SECTION 1. Assignment and Assumptions .
   SECTION 2. Payments .
 SECTION 3. Consent of the Borrower and the Working Capital Facility Administrative
Agent .




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SECTION 4. Non-Reliance on Assignor .
   SECTION 5. GOVERNING LAW .
 SECTION 6. Amendment .




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SECTION 7. Counterparts .




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IN WITNESS WHEREOF,
 [ASSIGNOR]By:Name:Title:[ASSIGNEE]By:Name:Title:[WESTLB AG, NEW YORK BRANCH,
as Working Capital Facility Administrative
AgentBy:Name:Title:]6[CONSTRUCTORA DE PROYECTOS
HIDROELECTRICOS, S.A. DE C.V.,
as the BorrowerBy:Name:Title:]7 
 6
    
    See footnote 4.7
    
    See footnote 3.




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EXHIBIT B TO  AMENDED AND RESTATEDWORKING CAPITAL FACILITY CREDIT AGREEMENT
 [FORM OF INTEREST RATE NOTICE]
 INTEREST RATE NOTICE
    
   Working Capital Facility Credit Agreement Borrower Working Capital Facility Lenders 8
 [Tranche A-1 Loans]
[,] [Tranche A-2 Loans] [and] [Tranche B Loans] [Eurodollar Loans] [ABR
Loans].
 9
 
 8
    
    Insert date that is not sooner than third Business Day following the date of delivery of this Interest Rate Notice.9
    
    Use only for Eurodollar Loans.




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CONSTRUCTORA DE PROYECTOS HIDROELECTRICOS, S.A. DE C.V.By:Name:Title:




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EXHIBIT C TO AMENDED AND RESTATEDWORKING CAPITAL FACILITY CREDIT AGREEMENT
 [FORM OF WORKING CAPITAL FACILITY NOTICE OF BORROWING]
 WORKING CAPITAL FACILITY NOTICE OF BORROWING
  
 
  Borrower
 (i)
    
    the Common Agreement, dated as of October 19, 2007 (as amended, supplemented or
otherwise modified from time to time, the Common Agreement) among the
Borrower; WestLB AG, New York Branch (WestLB), as intercreditor agent (the
Intercreditor Agent); each of the banks and other financial institutions
listed on the signature pages thereto as Construction Facility Lenders (the
Construction Facility Lenders); WestLB, as Construction Facility
Administrative Agent (the Construction Facility Administrative Agent); each of
the banks and other financial institutions listed on the signature pages thereto as
Working Capital Facility Lenders (the Working Capital Facility Lenders);
WestLB, as Working Capital Facility Administrative Agent (the Working Capital
Facility Administrative Agent); Citibank, N.A., as Offshore Collateral Agent (the
Offshore Collateral Agent); Banco Nacional de
México, Integrante del Grupo
Financiero Banamex, as Onshore Collateral Agent (the Onshore Collateral
Agent); and the other Lenders (as defined therein) and Lender Representatives (as
defined therein) from time to time party thereto; and




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(ii)
    
    the Amended and Restated Working Capital Facility Credit Agreement, dated as of
October 13, 2010 (as amended, supplemented or otherwise modified from time to time, the
Working Capital Facility Credit Agreement), among the Borrower, the Working
Capital Facility Lenders, and the Working Capital Facility Administrative Agent.
  
    
    a Working Capital Facility Borrowing under the Working Capital Facility Credit
Agreement, in the aggregate amount of [U.S. $_______ in Tranche A-1 Loans] [,] [and]
[U.S.$ ___ in Tranche A-2 Loans] [and] [U.S. $_______ in Tranche B Loans] (the
Requested Borrowing), to be made on ______ ___, 20___ (the Requested Borrowing
Date).
  I.
    
    WIRE TRANSFER INSTRUCTIONS
  II.
    
    CALCULATION OF REQUESTED BORROWING
      where
 
 *
    
    Include bracketed language only if there is a balance in the Dollar Disbursement
Guarantee Account.




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Very truly yours,
CONSTRUCTORA DE PROYECTOS HIDROELECTRICOS, S.A. DE C.V.By:Name:Title: 
 *
    
    Id.




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SCHEDULE I
 COST CERTIFICATE
 Current Month (Mes en Curso)Cumulative10
    
    
    Budget
    
    
    Actual (Actual)A. DIRECT COSTSCOSTOS DIRECTOSWorkforceMano de ObraMaterialsMaterialesMachinery MaquinariaMaterials ProcessingProcesamiento de MaterialesElectromechanical ElectromecánicosB. INDIRECT COSTSCOSTOS INDIRECTOSConstruction and conservation of access roadsConstrucción y Conservación de AccesosOther installations for electromechanical works Otras instalaciones para trabajos electromecánicosInstallment and dismantling of Equipment Montaje y Desmantelamiento de EquipoTechnical and Administrative PersonnelPersonal Técnico y AdministrativoTravel Allowance Pasajes y viáticosOther servicesOtros ServiciosExecution of Workforce Contracts Suscripción de contratos de TrabajoBuildings and locals Edificios y otras construccionesMaintenance and storage premisesLocales de mantenimiento y guardaWarehouses BodegasGeneral Installations Instalaciones GeneralesEquipment, furniture and other fixtures Equipos, Muebles y enseresRents (buildings, vehicles) Rentas (construcciones, vehículos)Construction of camps Construcción de campamentosInstallation of electric lines Instalación de líneas eléctricas
 
 10
    
    Insert cumulative amount to date including amounts included in this Notice of Borrowing.




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Current Month (Mes en Curso)Cumulative10
    
    
    Budget
    
    
    Actual (Actual)Freight and transport of Machinery and othersFletes y acarreos de Maquinaria y otros.TelecommunicationsTelecomunicacionesInformation Technologies (Software and
Hardware)Tecnología Informática (Software and Hardware)Electricity, Gas Electricidad y GasBidding Costs Costos de LicitaciónConstruction of camps, plants and
installation elementsConstrucción de campamentos, plantas y
elementos para instalacionesEngineering, Consulting and Laboratories Consultoría y Laboratorio de IngeniaríaInsurance, Performance BondSeguros, Fianza de DesempeñoCorporate Allocation Gastos CorporativosProfits before tax Utilidad antes de ImpuestosVAT Payable IVA a PagarC. AGGREGATE DEBT SERVICE SERVICIO DE LA DEUDA EN EL AGREGADODebt Service (other than Non-Excluded Taxes,
Other Taxes and Additional Amounts)Debt Service (otro que los Impuestos No Excluidos, Otros
Impuestos y Montos Adicionales)Non-Excluded Taxes, Other Taxes and
Additional AmountsImpuestos No Excluidos, Otros Impuestos y
Montos AdicionalesD. OTHER FINANCING-RELATED EXPENSES (e.g., legal,
consultants, agents and the like)OTROS GASTOS RELACIONADOS AL FINANCIAMIENTO (e.g.,
abogados, consultores, agents y otros)




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SCHEDULE II
 WIRE TRANSFER INSTRUCTIONS




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Exhibit D  to Amended and Restated  Working Capital Facility Credit Agreement
 [FORM OF DISBURSEMENT LC]
    To:
    
    WestLB AG, New York Branch,
as Working Capital Facility Administrative Agent for the lenders
under the Working Capital Facility Credit Agreement and the
Common Agreement referred to below
1211 Avenue of the Americas
New York, New York 10036
Attention: Jared Brenner
Telephone: 1 (212) 852-6166
Telecopier: 1 (212) 789-0075
  11 Issuing Bank Letter of Credit Total Amount Working
Capital Facility Credit Agreement Borrower Beneficiary Common Agreement
 
 11
    
    Insert name of account party, which must not be the Borrower.




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pro tanto
 Annex A Certificate of Execution
 Business Day




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12 13 14 15
 Expiration Date
  [Applicable Rules: Version 1-UCP]
 
 12
    
    If any letter of credit is confirmed, the confirming banks form must make clear that that waiver described above is applicable to such bank.13
    
    Insert description of relevant document(s) which governs the reimbursement obligations of the account party to the Issuing Bank.14
    
    Include if LC governed by NY law.15
    
    Insert only if LC utilizes ISP98.




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UCP 16
 Annex B Annexes A B 17
  [Applicable Rules: Version 2  ISP98 (to be used only if the Letter of Credit Provider cannot
provide a Letter of Credit governed by the UCP)]
 18
 
 16
    
    Include if LC governed by NY law.17
    
    Include if LC governed by NY law.18
    
    Include if LC governed by NY law.




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Annex B Annexes A B 19
  [Dispute Resolution: Version 1  New York law]
  [Dispute Resolution: Version 2  Mexican Law (to be used only if the Letter of Credit Provider
cannot provide a Letter of Credit governed by New York Law ]
 Dispute AAA
 
 19
    
    Include if LC governed by NY law.




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Rules Tribunal Financial Times
   20
    
 20
    
    Include if LC governed by NY law.




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By:
    
    
    
    
    
    
    
    By:Name:
    
    
    
    
    
    
    
    Name:Title:
    
    Authorized Representative
    
    
    
    
    
    Title:
    
    Authorized Representative




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21 22 Beneficiary
       
 21
    
    Insert name of Beneficiary.22
    
    Insert capacity of Beneficiary.




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Sincerely,
[BENEFICIARY]
[____________]23, as
[____________]24By:Name:Title: 
 23
    
    Insert name of Beneficiary.24
    
    Insert capacity of Beneficiary.




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25
  
 
  Annexes A B
 [____________]26, as TransferorBy:Name:Title: 
 25
    
    Insert name of Beneficiary.26
    
    Insert name of Transferor.




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Exhibit E  to Amended and Restated  Working Capital Facility Credit Agreement
 [FORM OF GUARANTOR CONFIRMATION]
  [[Name of Guarantor] Guarantor [Name of Guarantors] Guarantor [name of guarantee] [name of guarantee]
 [name of guarantee]
  [GUARANTOR]By:Name:Title:




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[GUARANTOR]By:Name:Title: Accepted and agreed:CITIBANK, N.A.,as Offshore Collateral AgentBy:Name:Title: